/* =============================================
   CSS CUSTOM PROPERTIES
   ============================================= */

:root {
    /* Primary - Professional Blue */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-200: #bfdbfe;
    --primary-300: #93c5fd;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    --primary-900: #1e3a8a;

    /* Secondary - Elegant Purple */
    --secondary-50: #faf5ff;
    --secondary-100: #f3e8ff;
    --secondary-200: #e9d5ff;
    --secondary-300: #d8b4fe;
    --secondary-400: #c084fc;
    --secondary-500: #a855f7;
    --secondary-600: #9333ea;
    --secondary-700: #7e22ce;
    --secondary-800: #6b21a8;
    --secondary-900: #581c87;

    /* Accent - Warm amber for editorial warmth */
    --accent-50: #fffbeb;
    --accent-100: #fef3c7;
    --accent-200: #fde68a;
    --accent-300: #fcd34d;
    --accent-400: #fbbf24;
    --accent-500: #f59e0b;
    --accent-600: #d97706;

    /* Neutral - Professional Gray Scale */
    --neutral-50: #fafafa;
    --neutral-100: #f5f5f5;
    --neutral-200: #e5e5e5;
    --neutral-300: #d4d4d4;
    --neutral-400: #a3a3a3;
    --neutral-500: #737373;
    --neutral-600: #525252;
    --neutral-700: #404040;
    --neutral-800: #262626;
    --neutral-900: #171717;

    /* Semantic Colors */
    --success-50: #f0fdf4;
    --success-100: #dcfce7;
    --success-500: #22c55e;
    --success-600: #16a34a;
    --success-700: #15803d;

    --error-50: #fef2f2;
    --error-100: #fee2e2;
    --error-500: #ef4444;
    --error-600: #dc2626;
    --error-700: #b91c1c;

    --warning-50: #fffbeb;
    --warning-100: #fef3c7;
    --warning-500: #f59e0b;
    --warning-600: #d97706;
    --warning-700: #b45309;

    --info-50: #eff6ff;
    --info-100: #dbeafe;
    --info-500: #3b82f6;
    --info-600: #2563eb;
    --info-700: #1d4ed8;

    /* Functional Colors */
    --background: #f8fafc;
    --background-secondary: #f1f5f9;
    --surface: #ffffff;
    --surface-elevated: #ffffff;
    --surface-hover: #f5f5f5;

    --text-primary: #171717;
    --text-secondary: #525252;
    --text-tertiary: #a3a3a3;
    --text-disabled: #d4d4d4;
    --text-inverse: #ffffff;

    --border-default: #e5e5e5;
    --border-strong: #d4d4d4;
    --border-subtle: #f5f5f5;

    --focus-ring: rgba(59, 130, 246, 0.5);

    /* Shadows */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Primary font - Sans Serif */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";

    /* Secondary font - Serif for reading */
    --font-serif: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;

    /* Monospace for code */
    --font-mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, "DejaVu Sans Mono", monospace;

    /* Type Scale (Fluid Typography) */
    --font-size-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);      /* 12-14px */
    --font-size-sm: clamp(0.875rem, 0.825rem + 0.25vw, 1rem);      /* 14-16px */
    --font-size-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);     /* 16-18px */
    --font-size-lg: clamp(1.125rem, 1.05rem + 0.375vw, 1.25rem);   /* 18-20px */
    --font-size-xl: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);       /* 20-24px */
    --font-size-2xl: clamp(1.5rem, 1.35rem + 0.75vw, 1.875rem);    /* 24-30px */
    --font-size-3xl: clamp(1.875rem, 1.65rem + 1.125vw, 2.25rem);  /* 30-36px */
    --font-size-4xl: clamp(2.25rem, 1.95rem + 1.5vw, 3rem);        /* 36-48px */
    --font-size-5xl: clamp(3rem, 2.55rem + 2.25vw, 3.75rem);       /* 48-60px */
    --font-size-6xl: clamp(3.75rem, 3.15rem + 3vw, 4.5rem);        /* 60-72px */

    /* Font Weights */
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;

    /* Line Heights */
    --line-height-tight: 1.25;
    --line-height-snug: 1.375;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    --line-height-loose: 2;

    /* Letter Spacing */
    --letter-spacing-tighter: -0.05em;
    --letter-spacing-tight: -0.025em;
    --letter-spacing-normal: 0em;
    --letter-spacing-wide: 0.025em;
    --letter-spacing-wider: 0.05em;
    --letter-spacing-widest: 0.1em;

    /* Spacing System (8px base) */
    --space-0: 0;
    --space-px: 1px;
    --space-0-5: 0.125rem;   /* 2px */
    --space-1: 0.25rem;      /* 4px */
    --space-1-5: 0.375rem;   /* 6px */
    --space-2: 0.5rem;       /* 8px */
    --space-2-5: 0.625rem;   /* 10px */
    --space-3: 0.75rem;      /* 12px */
    --space-3-5: 0.875rem;   /* 14px */
    --space-4: 1rem;         /* 16px */
    --space-5: 1.25rem;      /* 20px */
    --space-6: 1.5rem;       /* 24px */
    --space-7: 1.75rem;      /* 28px */
    --space-8: 2rem;         /* 32px */
    --space-9: 2.25rem;      /* 36px */
    --space-10: 2.5rem;      /* 40px */
    --space-11: 2.75rem;     /* 44px */
    --space-12: 3rem;        /* 48px */
    --space-14: 3.5rem;      /* 56px */
    --space-16: 4rem;        /* 64px */
    --space-20: 5rem;        /* 80px */
    --space-24: 6rem;        /* 96px */
    --space-28: 7rem;        /* 112px */
    --space-32: 8rem;        /* 128px */

    /* Border Radius */
    --radius-none: 0;
    --radius-sm: 0.25rem;      /* 4px */
    --radius-default: 0.5rem;  /* 8px */
    --radius-md: 0.75rem;      /* 12px */
    --radius-lg: 1rem;         /* 16px */
    --radius-xl: 1.25rem;      /* 20px */
    --radius-2xl: 1.5rem;      /* 24px */
    --radius-3xl: 2rem;        /* 32px */
    --radius-full: 9999px;

    /* Durations */
    --duration-fast: 100ms;
    --duration-normal: 200ms;
    --duration-slow: 300ms;
    --duration-slower: 500ms;

    /* Easing functions */
    --ease-in: cubic-bezier(0.4, 0, 1, 1);
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-sharp: cubic-bezier(0.4, 0, 0.6, 1);

    /* Common transitions */
    --transition-base: all var(--duration-normal) var(--ease-in-out);
    --transition-colors: color var(--duration-fast) var(--ease-in-out),
                        background-color var(--duration-fast) var(--ease-in-out),
                        border-color var(--duration-fast) var(--ease-in-out);
    --transition-shadow: box-shadow var(--duration-normal) var(--ease-in-out);
    --transition-transform: transform var(--duration-normal) var(--ease-out);

    /* Z-Index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* =============================================
   DARK MODE OVERRIDES
   ============================================= */

[data-theme="dark"] {
    /* Primary - Adjusted for dark mode */
    --primary-50: #1e3a8a;
    --primary-100: #1e40af;
    --primary-200: #1d4ed8;
    --primary-300: #2563eb;
    --primary-400: #3b82f6;
    --primary-500: #60a5fa;
    --primary-600: #93c5fd;
    --primary-700: #bfdbfe;
    --primary-800: #dbeafe;
    --primary-900: #eff6ff;

    /* Secondary */
    --secondary-50: #581c87;
    --secondary-100: #6b21a8;
    --secondary-200: #7e22ce;
    --secondary-300: #9333ea;
    --secondary-400: #a855f7;
    --secondary-500: #c084fc;
    --secondary-600: #d8b4fe;
    --secondary-700: #e9d5ff;
    --secondary-800: #f3e8ff;
    --secondary-900: #faf5ff;

    /* Accent */
    --accent-50: #451a03;
    --accent-100: #78350f;
    --accent-200: #92400e;
    --accent-300: #b45309;
    --accent-400: #d97706;
    --accent-500: #f59e0b;
    --accent-600: #fbbf24;

    /* Neutral - Inverted */
    --neutral-50: #171717;
    --neutral-100: #262626;
    --neutral-200: #404040;
    --neutral-300: #525252;
    --neutral-400: #737373;
    --neutral-500: #a3a3a3;
    --neutral-600: #d4d4d4;
    --neutral-700: #e5e5e5;
    --neutral-800: #f5f5f5;
    --neutral-900: #fafafa;

    /* Functional Colors */
    --background: #0a0a0a;
    --background-secondary: #171717;
    --surface: #171717;
    --surface-elevated: #262626;
    --surface-hover: #262626;

    --text-primary: #fafafa;
    --text-secondary: #d4d4d4;
    --text-tertiary: #a3a3a3;
    --text-disabled: #525252;
    --text-inverse: #0a0a0a;

    --border-default: #262626;
    --border-strong: #404040;
    --border-subtle: #171717;

    --focus-ring: rgba(96, 165, 250, 0.5);

    /* Shadows - Enhanced for dark mode */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.6), 0 1px 2px -1px rgba(0, 0, 0, 0.6);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.6), 0 2px 4px -2px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6), 0 4px 6px -4px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 8px 10px -6px rgba(0, 0, 0, 0.6);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.75);
}

/* =============================================
   BASE & RESET
   ============================================= */

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background-color: var(--background);
    transition: background-color var(--duration-normal) var(--ease-in-out),
                color var(--duration-normal) var(--ease-in-out);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

body > main {
    flex: 1;
}

/* Focus visible for accessibility */
:focus-visible {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

/* Remove focus outline for mouse users */
:focus:not(:focus-visible) {
    outline: none;
}

/* =============================================
   TYPOGRAPHY
   ============================================= */

h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--text-primary);
    margin-bottom: var(--space-4);
    letter-spacing: var(--letter-spacing-tight);
}

h1 {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-6);
    font-weight: var(--font-weight-extrabold);
    letter-spacing: var(--letter-spacing-tighter);
}

h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--space-5);
}

h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--space-4);
}

h4 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
}

h5 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
}

h6 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
}

p {
    margin-bottom: var(--space-4);
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
}

a {
    color: var(--primary-600);
    text-decoration: none;
    transition: var(--transition-colors);
}

a:hover {
    color: var(--primary-700);
}

a:focus-visible {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

strong, b {
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

em, i {
    font-style: italic;
}

small {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    padding: var(--space-1) var(--space-2);
    background-color: var(--neutral-100);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    color: var(--error-600);
}

pre {
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    background-color: var(--neutral-100);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-default);
    padding: var(--space-4);
    overflow-x: auto;
    margin-bottom: var(--space-4);
}

pre code {
    background-color: transparent;
    border: none;
    padding: 0;
    color: var(--text-primary);
}

blockquote {
    border-left: 4px solid var(--primary-500);
    padding-left: var(--space-4);
    margin: var(--space-6) 0;
    color: var(--text-secondary);
    font-style: italic;
}

hr {
    border: none;
    border-top: 1px solid var(--border-default);
    margin: var(--space-8) 0;
}

/* =============================================
   LAYOUT
   ============================================= */

.container {
    max-width: 1280px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
}

.container-sm {
    max-width: 768px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
}

.container-lg {
    max-width: 1536px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
}

/* =============================================
   ANIMATIONS & KEYFRAMES
   ============================================= */

@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-24px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    33% { transform: translateY(-8px) rotate(1deg); }
    66% { transform: translateY(4px) rotate(-1deg); }
}

@keyframes pulse-soft {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 0.8; }
}

/* Entrance animation class */
.animate-in {
    opacity: 0;
    animation: fadeInUp 0.6s var(--ease-out) forwards;
}

.animate-in:nth-child(1) { animation-delay: 0.05s; }
.animate-in:nth-child(2) { animation-delay: 0.1s; }
.animate-in:nth-child(3) { animation-delay: 0.15s; }
.animate-in:nth-child(4) { animation-delay: 0.2s; }
.animate-in:nth-child(5) { animation-delay: 0.25s; }
.animate-in:nth-child(6) { animation-delay: 0.3s; }
.animate-in:nth-child(7) { animation-delay: 0.35s; }
.animate-in:nth-child(8) { animation-delay: 0.4s; }
.animate-in:nth-child(9) { animation-delay: 0.45s; }
.animate-in:nth-child(10) { animation-delay: 0.5s; }

.animate-fade-in {
    animation: fadeIn 0.5s var(--ease-out) forwards;
}

.animate-scale-in {
    animation: scaleIn 0.4s var(--ease-out) forwards;
}

/* =============================================
   NAVIGATION
   ============================================= */

.navbar {
    border-bottom: 1px solid var(--border-default);
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.08), 0 1px 2px -1px rgba(0, 0, 0, 0.06);
    padding: var(--space-4) 0;
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    backdrop-filter: blur(16px) saturate(180%);
    background-color: rgba(255, 255, 255, 0.92);
}

[data-theme="dark"] .navbar {
    background-color: rgba(10, 10, 10, 0.85);
}

.navbar-container {
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-extrabold);
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition-colors);
    letter-spacing: var(--letter-spacing-tight);
}

.navbar-brand:hover {
    color: var(--primary-600);
}

/* CSS-only brand mark: geometric diamond */
.brand-mark {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--secondary-500) 100%);
    border-radius: var(--radius-default);
    transform: rotate(45deg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    position: relative;
}

.brand-mark::after {
    content: '';
    width: 12px;
    height: 12px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 2px;
    transform: rotate(0deg);
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    list-style: none;
}

.navbar-link {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
    text-decoration: none;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-default);
    transition: color var(--duration-normal) var(--ease-in-out),
                background-color var(--duration-normal) var(--ease-in-out);
    position: relative;
}

.navbar-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-500), var(--secondary-500));
    transition: width var(--duration-slow) var(--ease-out), left var(--duration-slow) var(--ease-out);
    border-radius: 1px;
}

.navbar-link:hover::after,
.navbar-link.active::after {
    width: calc(100% - var(--space-6));
    left: var(--space-3);
}

.navbar-link:hover {
    color: var(--primary-600);
}

.navbar-link.active {
    color: var(--primary-600);
    font-weight: var(--font-weight-semibold);
}

/* Navbar dropdown */
.nav-dropdown {
    position: relative;
}

.dropdown-arrow {
    font-size: 0.65em;
    opacity: 0.6;
    transition: transform var(--duration-normal) var(--ease-in-out);
    display: inline-block;
}

.nav-dropdown:hover .dropdown-arrow {
    transform: rotate(180deg);
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: var(--surface-elevated);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-default);
    box-shadow: var(--shadow-lg);
    z-index: var(--z-dropdown);
    padding: var(--space-2) 0;
    list-style: none;
    margin-top: var(--space-1);
}

.nav-dropdown:hover .dropdown-menu {
    display: block;
}

.dropdown-menu li a {
    display: block;
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-in-out),
                background-color var(--duration-fast) var(--ease-in-out);
    white-space: nowrap;
}

.dropdown-menu li a:hover {
    color: var(--primary-600);
    background-color: var(--surface-hover);
}

/* Navbar actions: search, theme toggle, hamburger */
.navbar-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-left: auto;
}

/* Mobile hamburger */
.navbar-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-default);
    transition: background-color var(--duration-fast) var(--ease-in-out);
}

.navbar-toggle:hover {
    background-color: var(--surface-hover);
}

.navbar-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 1px;
    transition: transform var(--duration-slow) var(--ease-out),
                opacity var(--duration-normal) var(--ease-in-out);
}

.navbar-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.navbar-toggle.active span:nth-child(2) {
    opacity: 0;
}

.navbar-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* =============================================
   HERO SECTION
   ============================================= */

.hero {
    position: relative;
    padding: var(--space-20) 0 var(--space-10);
    overflow: hidden;
    background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #312e81 100%);
}

[data-theme="dark"] .hero {
    background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #312e81 100%);
}

/* Subtle mesh overlay */
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(99, 102, 241, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(139, 92, 246, 0.25) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(251, 191, 36, 0.1) 0%, transparent 40%);
    opacity: 0.6;
    pointer-events: none;
}

[data-theme="dark"] .hero::before {
    opacity: 0.4;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 720px;
    margin: 0 auto;
    animation: fadeInUp 0.7s var(--ease-out) both;
}

.hero-title {
    font-size: var(--font-size-6xl);
    font-weight: var(--font-weight-extrabold);
    letter-spacing: var(--letter-spacing-tighter);
    line-height: 1.1;
    margin-bottom: var(--space-6);
    color: #ffffff;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: rgba(255, 255, 255, 0.75);
    line-height: var(--line-height-relaxed);
    margin-bottom: 0;
    max-width: 540px;
    margin-left: auto;
    margin-right: auto;
}

.hero-label {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: rgba(165, 180, 252, 1);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-widest);
    margin-bottom: var(--space-6);
}

.hero-label::before,
.hero-label::after {
    content: '';
    width: 24px;
    height: 1px;
    background: rgba(165, 180, 252, 0.5);
}

/* =============================================
   SEARCH
   ============================================= */

.search-form {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    max-width: 560px;
    width: 100%;
}

.search-input-wrapper {
    position: relative;
    flex: 1;
}

.search-input-icon {
    position: absolute;
    left: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
    pointer-events: none;
}

.search-input {
    padding-left: var(--space-10) !important;
}

/* Hero variant — frosted glass on dark background */
.search-form-hero {
    margin: var(--space-8) auto 0;
}

.search-form-hero .search-input {
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #ffffff;
}

.search-form-hero .search-input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.search-form-hero .search-input:focus {
    border-color: rgba(255, 255, 255, 0.4);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.18);
}

.search-form-hero .search-input-icon {
    color: rgba(255, 255, 255, 0.5);
}

/* Page variant — standard form on light/dark background */
.search-form-page {
    margin: 0 0 var(--space-8);
    max-width: 100%;
}

/* Navbar search icon */
.navbar-search-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: var(--transition-colors);
}

.navbar-search-link:hover {
    color: var(--text-primary);
}

.navbar-search-link svg {
    display: block;
}

/* =============================================
   FEATURED POST (Hero card)
   ============================================= */

.featured-post {
    position: relative;
    background: var(--surface);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-xl);
    padding: var(--space-10);
    margin-bottom: var(--space-12);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: box-shadow var(--duration-slow) var(--ease-out),
                transform var(--duration-slow) var(--ease-out);
    animation: fadeInUp 0.6s var(--ease-out) 0.15s both;
}

/* Top gradient bar */
.featured-post::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-500), var(--secondary-500), var(--accent-400));
    opacity: 1;
}

/* Left accent gradient */
.featured-post::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(180deg, var(--primary-500), var(--secondary-500), var(--accent-400));
}

.featured-post:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-3px);
}

.featured-post-label {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    color: var(--primary-600);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-widest);
    margin-bottom: var(--space-4);
}

.featured-post-label::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--primary-500);
    border-radius: 50%;
    animation: pulse-soft 2s ease-in-out infinite;
}

.featured-post-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-extrabold);
    letter-spacing: var(--letter-spacing-tight);
    line-height: var(--line-height-tight);
    margin-bottom: var(--space-4);
}

.featured-post-title a {
    color: var(--text-primary);
    transition: color var(--duration-normal) var(--ease-in-out);
}

.featured-post-title a:hover {
    color: var(--primary-600);
}

.featured-post-excerpt {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-6);
    max-width: 640px;
}

.featured-post-meta {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

/* =============================================
   PAGE HEADER
   ============================================= */

.page-header {
    padding: var(--space-12) 0 var(--space-8);
    border-bottom: 1px solid var(--border-default);
    margin-bottom: var(--space-8);
    animation: fadeInDown 0.5s var(--ease-out) both;
}

.page-header-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-extrabold);
    margin-bottom: var(--space-2);
}

.page-header-desc {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: 0;
}

.page-header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-top: var(--space-4);
}

/* =============================================
   CARDS
   ============================================= */

.card {
    background-color: var(--surface);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    box-shadow: var(--shadow-md);
    transition: var(--transition-shadow), var(--transition-transform);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-interactive {
    cursor: pointer;
}

.card-interactive:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    padding-bottom: var(--space-4);
    margin-bottom: var(--space-4);
    border-bottom: 1px solid var(--border-default);
}

.card-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.card-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

.card-footer {
    padding-top: var(--space-4);
    margin-top: var(--space-4);
    border-top: 1px solid var(--border-default);
}

/* =============================================
   BLOG POST CARDS (enhanced)
   ============================================= */

.post-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--space-8);
}

.post-card {
    position: relative;
    background-color: var(--surface);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: box-shadow var(--duration-slow) var(--ease-out),
                transform var(--duration-slow) var(--ease-out),
                border-color var(--duration-slow) var(--ease-out);
}

.post-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-500), var(--secondary-500));
    opacity: 1;
    transition: height var(--duration-slow) var(--ease-out);
}

.post-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-6px);
    border-color: var(--primary-200);
}

[data-theme="dark"] .post-card:hover {
    border-color: var(--primary-400);
}

.post-card:hover::before {
    height: 4px;
}

.post-card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.post-card-content {
    padding: var(--space-6) var(--space-6) var(--space-5);
}

.post-card-number {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    color: var(--text-tertiary);
    letter-spacing: var(--letter-spacing-widest);
    text-transform: uppercase;
    margin-bottom: var(--space-3);
    display: block;
}

.post-card-meta {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-3);
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    flex-wrap: wrap;
}

.post-card-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-extrabold);
    line-height: var(--line-height-tight);
    margin-bottom: var(--space-3);
}

.post-card-title a {
    color: var(--text-primary);
    transition: color var(--duration-normal) var(--ease-in-out);
}

.post-card-title a:hover {
    color: var(--primary-600);
}

.post-card-excerpt {
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-5);
    font-size: var(--font-size-sm);
}

.post-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* =============================================
   ARTICLE VIEW
   ============================================= */

.article-header {
    position: relative;
    padding: var(--space-12) 0 var(--space-8);
    margin-bottom: var(--space-8);
    border-bottom: 1px solid var(--border-default);
    animation: fadeInUp 0.5s var(--ease-out) both;
    max-width: 768px;
    margin-left: auto;
    margin-right: auto;
}

.comments-section {
    max-width: 768px;
    margin-left: auto;
    margin-right: auto;
}

.article-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-500), var(--secondary-500), var(--accent-400));
    border-radius: 2px;
}

.article-breadcrumb {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    margin-bottom: var(--space-6);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.article-breadcrumb a {
    color: var(--text-tertiary);
    transition: color var(--duration-fast) var(--ease-in-out);
}

.article-breadcrumb a:hover {
    color: var(--primary-600);
}

.article-title {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-extrabold);
    letter-spacing: var(--letter-spacing-tighter);
    line-height: 1.15;
    margin-bottom: var(--space-6);
}

.article-meta {
    display: flex;
    align-items: center;
    gap: var(--space-5);
    flex-wrap: wrap;
}

.article-author {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

/* Author avatar circle (CSS initials) */
.author-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    flex-shrink: 0;
    letter-spacing: 0.5px;
}

.author-avatar-sm {
    width: 32px;
    height: 32px;
    font-size: var(--font-size-xs);
}

.author-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.author-name {
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}

.author-date {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

/* Reading time badge */
.reading-time {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1-5);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--primary-700);
    padding: var(--space-1) var(--space-3);
    background: var(--primary-100);
    border-radius: var(--radius-full);
}

.reading-time::before {
    content: '';
    width: 14px;
    height: 14px;
    border: 2px solid var(--primary-500);
    border-radius: 50%;
    position: relative;
    display: inline-block;
    flex-shrink: 0;
}

.article-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-top: var(--space-5);
}

.post-content {
    font-family: var(--font-serif);
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    color: var(--text-secondary);
    animation: fadeIn 0.5s var(--ease-out) 0.2s both;
    max-width: 768px;
    margin-left: auto;
    margin-right: auto;
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4 {
    font-family: var(--font-sans);
    margin-top: var(--space-10);
    margin-bottom: var(--space-4);
    color: var(--text-primary);
}

.post-content h1:first-child,
.post-content h2:first-child,
.post-content h3:first-child {
    margin-top: 0;
}

.post-content p {
    margin-bottom: var(--space-6);
}

.post-content ul,
.post-content ol {
    margin-bottom: var(--space-6);
    padding-left: var(--space-6);
}

.post-content li {
    margin-bottom: var(--space-2);
}

.post-content a {
    color: var(--primary-600);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
}

.post-content a:hover {
    color: var(--primary-700);
}

.post-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-default);
    margin: var(--space-8) 0;
}

/* =============================================
   COMMENTS (enhanced)
   ============================================= */

.comments-section {
    margin-top: var(--space-12);
    padding-top: var(--space-8);
    border-top: 1px solid var(--border-default);
}

.comments-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-6);
}

.comment {
    background-color: var(--surface);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    margin-bottom: var(--space-4);
    transition: border-color var(--duration-normal) var(--ease-in-out);
}

.comment:hover {
    border-color: var(--border-strong);
}

.comment-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-3);
}

.comment-author-info {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.comment-author {
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}

.comment-date {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

.comment-body {
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    font-size: var(--font-size-sm);
}

.comment-actions {
    margin-top: var(--space-3);
}

.comment-form {
    margin-top: var(--space-6);
    margin-bottom: var(--space-6);
    padding: var(--space-6);
    background-color: var(--surface);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
}

/* =============================================
   BUTTONS
   ============================================= */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2-5) var(--space-4);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    white-space: nowrap;
    border: 1px solid transparent;
    border-radius: var(--radius-default);
    cursor: pointer;
    transition: var(--transition-colors), var(--transition-shadow), transform var(--duration-fast) var(--ease-out);
    user-select: none;
}

.btn:active:not(:disabled) {
    transform: scale(0.98);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.btn:focus-visible {
    outline: 2px solid var(--focus-ring);
    outline-offset: 2px;
}

/* Button variants */
.btn-primary {
    background-color: var(--primary-600);
    color: var(--text-inverse);
    border-color: var(--primary-600);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-700);
    border-color: var(--primary-700);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-primary:active {
    background-color: var(--primary-800);
}

.btn-secondary {
    background-color: var(--secondary-600);
    color: var(--text-inverse);
    border-color: var(--secondary-600);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--secondary-700);
    border-color: var(--secondary-700);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-600);
    border-color: var(--primary-600);
}

.btn-outline:hover:not(:disabled) {
    background-color: var(--primary-50);
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.15);
}

.btn-ghost {
    background-color: transparent;
    color: var(--text-secondary);
    border-color: transparent;
}

.btn-ghost:hover:not(:disabled) {
    background-color: var(--neutral-100);
    color: var(--text-primary);
}

.btn-success {
    background-color: var(--success-600);
    color: var(--text-inverse);
    border-color: var(--success-600);
}

.btn-success:hover:not(:disabled) {
    background-color: var(--success-700);
}

.btn-danger {
    background-color: var(--error-600);
    color: var(--text-inverse);
    border-color: var(--error-600);
}

.btn-danger:hover:not(:disabled) {
    background-color: var(--error-700);
}

/* Button sizes */
.btn-xs {
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-xs);
}

.btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-lg);
}

.btn-xl {
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-xl);
}

.btn-block {
    display: flex;
    width: 100%;
}

/* =============================================
   FORMS
   ============================================= */

.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.form-label-required::after {
    content: " *";
    color: var(--error-500);
}

.form-input,
.form-textarea,
.form-select {
    display: block;
    width: 100%;
    padding: var(--space-2-5) var(--space-3);
    font-size: var(--font-size-base);
    font-family: inherit;
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background-color: var(--surface);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-default);
    transition: var(--transition-colors), var(--transition-shadow);
}

.form-input:hover,
.form-textarea:hover,
.form-select:hover {
    border-color: var(--border-strong);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px var(--focus-ring);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-tertiary);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

.form-select {
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right var(--space-2) center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    padding-right: var(--space-8);
}

.form-checkbox,
.form-radio {
    width: 1.125rem;
    height: 1.125rem;
    cursor: pointer;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-default);
    transition: var(--transition-colors);
}

.form-radio {
    border-radius: 50%;
}

.form-checkbox:checked,
.form-radio:checked {
    background-color: var(--primary-600);
    border-color: var(--primary-600);
}

.form-checkbox:focus,
.form-radio:focus {
    outline: 2px solid var(--focus-ring);
    outline-offset: 2px;
}

.form-help {
    display: block;
    margin-top: var(--space-1-5);
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

.form-error {
    display: block;
    margin-top: var(--space-1-5);
    font-size: var(--font-size-sm);
    color: var(--error-600);
}

.form-input-error,
.form-textarea-error,
.form-select-error {
    border-color: var(--error-500);
}

.form-input-error:focus,
.form-textarea-error:focus,
.form-select-error:focus {
    border-color: var(--error-500);
    box-shadow: 0 0 0 3px var(--error-50);
}

/* =============================================
   ALERTS
   ============================================= */

.alert {
    padding: var(--space-4);
    border-radius: var(--radius-default);
    border-left: 4px solid;
    margin-bottom: var(--space-4);
}

.alert-success {
    background-color: var(--success-50);
    border-color: var(--success-600);
    color: var(--success-700);
}

.alert-error {
    background-color: var(--error-50);
    border-color: var(--error-600);
    color: var(--error-700);
}

.alert-warning {
    background-color: var(--warning-50);
    border-color: var(--warning-600);
    color: var(--warning-700);
}

.alert-info {
    background-color: var(--info-50);
    border-color: var(--info-600);
    color: var(--info-700);
}

.alert-title {
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-1);
}

/* =============================================
   BADGES
   ============================================= */

.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
}

.badge-primary {
    background-color: var(--primary-100);
    color: var(--primary-700);
}

.badge-secondary {
    background-color: var(--secondary-100);
    color: var(--secondary-700);
}

.badge-success {
    background-color: var(--success-100);
    color: var(--success-700);
}

.badge-danger {
    background-color: var(--error-100);
    color: var(--error-700);
}

.badge-warning {
    background-color: var(--warning-100);
    color: var(--warning-700);
}

.badge-neutral {
    background-color: var(--neutral-100);
    color: var(--neutral-700);
}

.badge-sm {
    padding: var(--space-0-5, 2px) var(--space-1);
    font-size: 0.65rem;
}

a.badge {
    text-decoration: none;
    transition: opacity var(--transition-fast);
}
a.badge:hover {
    opacity: 0.8;
}

.text-muted {
    color: var(--text-tertiary);
}

/* Category filter bar */
.category-filter {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    padding: var(--space-4) 0;
    align-items: center;
}

.rss-link {
    display: inline-flex;
    align-items: center;
    color: var(--text-tertiary);
    transition: color var(--transition-fast);
    margin-left: auto;
}
.rss-link:hover {
    color: var(--primary-600);
}

/* =============================================
   TABLES
   ============================================= */

.table-container {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-default);
}

.table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--surface);
}

.table thead {
    background-color: var(--neutral-50);
}

.table th {
    padding: var(--space-3) var(--space-4);
    text-align: left;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
    border-bottom: 1px solid var(--border-default);
}

.table td {
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-subtle);
}

.table tbody tr:hover {
    background-color: var(--surface-hover);
}

.table tbody tr:last-child td {
    border-bottom: none;
}

.table-striped tbody tr:nth-child(even) {
    background-color: var(--neutral-50);
}

/* =============================================
   MODAL
   ============================================= */

.modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal-backdrop);
    backdrop-filter: blur(4px);
    animation: fadeIn var(--duration-normal) var(--ease-out);
}

.modal {
    background-color: var(--surface);
    border-radius: var(--radius-xl);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-2xl);
    animation: slideUp var(--duration-normal) var(--ease-out);
}

.modal-header {
    padding: var(--space-6);
    border-bottom: 1px solid var(--border-default);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--font-size-xl);
    color: var(--text-tertiary);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-default);
    transition: var(--transition-colors);
}

.modal-close:hover {
    color: var(--text-primary);
    background-color: var(--neutral-100);
}

.modal-body {
    padding: var(--space-6);
}

.modal-footer {
    padding: var(--space-6);
    border-top: 1px solid var(--border-default);
    display: flex;
    justify-content: flex-end;
    gap: var(--space-3);
}

/* =============================================
   LOADING SPINNER
   ============================================= */

.spinner {
    border: 3px solid var(--neutral-200);
    border-top-color: var(--primary-600);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 0.8s linear infinite;
}

.spinner-sm {
    width: 20px;
    height: 20px;
    border-width: 2px;
}

.spinner-lg {
    width: 60px;
    height: 60px;
    border-width: 4px;
}

/* =============================================
   THEME TOGGLE
   ============================================= */

.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition-colors);
    padding: 0;
}

.theme-toggle:hover {
    color: var(--text-primary);
}

/* Icon visibility based on data-mode */
.theme-icon {
    display: none;
}

.theme-toggle[data-mode="light"] .theme-icon-light {
    display: block;
}

.theme-toggle[data-mode="dark"] .theme-icon-dark {
    display: block;
}

.theme-toggle[data-mode="auto"] .theme-icon-auto {
    display: block;
}

/* =============================================
   PAGINATION (enhanced)
   ============================================= */

.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    margin-top: var(--space-12);
    padding-top: var(--space-8);
    border-top: 1px solid var(--border-default);
}

.pagination-info {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    padding: var(--space-2) var(--space-4);
}

/* =============================================
   FOOTER (proper)
   ============================================= */

.site-footer {
    margin-top: auto;
    padding: var(--space-12) 0 var(--space-8);
    background-color: #0f172a;
    color: rgba(255, 255, 255, 0.85);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-10);
    margin-bottom: var(--space-10);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: #ffffff;
    text-decoration: none;
    margin-bottom: var(--space-4);
}

.footer-desc {
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    max-width: 320px;
    margin-bottom: 0;
}

.footer-heading {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: #ffffff;
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wider);
    margin-bottom: var(--space-4);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--font-size-sm);
    transition: color var(--duration-fast) var(--ease-in-out);
}

.footer-links a:hover {
    color: #ffffff;
}

.footer-bottom {
    padding-top: var(--space-6);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-copyright {
    font-size: var(--font-size-xs);
    color: rgba(255, 255, 255, 0.4);
}

/* =============================================
   LOGIN PAGE
   ============================================= */

.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--background) 30%, var(--secondary-50) 60%, var(--accent-50) 100%);
}

[data-theme="dark"] .login-page {
    background: linear-gradient(135deg, rgba(30,58,138,0.15) 0%, var(--background) 30%, rgba(88,28,135,0.1) 60%, rgba(120,53,15,0.08) 100%);
}

/* Floating decorative shapes */
.login-page::before,
.login-page::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
}

.login-page::before {
    width: 400px;
    height: 400px;
    top: -100px;
    right: -100px;
    background: radial-gradient(circle, var(--primary-200) 0%, transparent 70%);
    opacity: 0.3;
    animation: float 12s ease-in-out infinite;
}

.login-page::after {
    width: 300px;
    height: 300px;
    bottom: -80px;
    left: -80px;
    background: radial-gradient(circle, var(--secondary-200) 0%, transparent 70%);
    opacity: 0.25;
    animation: float 15s ease-in-out infinite reverse;
}

[data-theme="dark"] .login-page::before {
    background: radial-gradient(circle, var(--primary-400) 0%, transparent 70%);
    opacity: 0.08;
}

[data-theme="dark"] .login-page::after {
    background: radial-gradient(circle, var(--secondary-400) 0%, transparent 70%);
    opacity: 0.06;
}

.login-card {
    position: relative;
    z-index: 1;
    max-width: 440px;
    width: 100%;
    padding: var(--space-10);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    animation: scaleIn 0.5s var(--ease-out) both;
}

[data-theme="dark"] .login-card {
    background: rgba(23, 23, 23, 0.85);
}

.login-header {
    text-align: center;
    margin-bottom: var(--space-8);
}

.login-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-extrabold);
    margin-bottom: var(--space-2);
}

.login-subtitle {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: 0;
}

.login-divider {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin: var(--space-6) 0;
    color: var(--text-tertiary);
    font-size: var(--font-size-xs);
}

.login-divider::before,
.login-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-default);
}

.login-footer {
    margin-top: var(--space-8);
    text-align: center;
}

.login-footer a {
    color: var(--text-tertiary);
    font-size: var(--font-size-sm);
    transition: color var(--duration-fast) var(--ease-in-out);
}

.login-footer a:hover {
    color: var(--primary-600);
}

/* OAuth button enhancements */
.btn-oauth {
    display: flex;
    width: 100%;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-lg);
    transition: var(--transition-colors), var(--transition-shadow), transform var(--duration-fast) var(--ease-out);
}

.btn-oauth:active {
    transform: scale(0.98);
}

.btn-oauth-microsoft {
    background-color: var(--primary-600);
    color: white;
    border: 1px solid var(--primary-600);
}

.btn-oauth-microsoft:hover {
    background-color: var(--primary-700);
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.3);
    color: white;
}

.btn-oauth-google {
    background-color: var(--surface);
    color: var(--text-primary);
    border: 1px solid var(--border-default);
}

.btn-oauth-google:hover {
    background-color: var(--surface-hover);
    border-color: var(--border-strong);
    box-shadow: var(--shadow-md);
    color: var(--text-primary);
}

/* =============================================
   404 PAGE
   ============================================= */

.error-page {
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-12) var(--space-6);
    position: relative;
    overflow: hidden;
}

.error-page::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--primary-100) 0%, transparent 70%);
    opacity: 0.3;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
}

[data-theme="dark"] .error-page::before {
    background: radial-gradient(circle, var(--primary-400) 0%, transparent 70%);
    opacity: 0.06;
}

.error-content {
    position: relative;
    z-index: 1;
    animation: fadeInUp 0.6s var(--ease-out) both;
}

.error-code {
    font-size: clamp(6rem, 15vw, 12rem);
    font-weight: var(--font-weight-extrabold);
    line-height: 1;
    margin-bottom: var(--space-4);
    background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: var(--letter-spacing-tighter);
}

.error-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-4);
}

.error-desc {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

/* =============================================
   EMPTY STATE
   ============================================= */

.empty-state {
    text-align: center;
    padding: var(--space-16) var(--space-6);
}

.empty-state-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-6);
    background: linear-gradient(135deg, var(--primary-100), var(--secondary-100));
    border-radius: var(--radius-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.empty-state-icon::after {
    content: '';
    width: 24px;
    height: 2px;
    background: var(--primary-400);
    border-radius: 1px;
    position: absolute;
}

.empty-state-icon::before {
    content: '';
    width: 2px;
    height: 24px;
    background: var(--primary-400);
    border-radius: 1px;
    position: absolute;
}

.empty-state-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-2);
}

.empty-state-desc {
    color: var(--text-tertiary);
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-6);
}

/* =============================================
   ADMIN DASHBOARD
   ============================================= */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-6);
    margin-bottom: var(--space-10);
}

.stat-card {
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--secondary-600) 100%);
    color: white;
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transform: translate(30%, -30%);
}

.stat-value {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    line-height: 1;
    margin-bottom: var(--space-2);
}

.stat-label {
    font-size: var(--font-size-sm);
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wider);
    font-weight: var(--font-weight-medium);
}

.stat-change {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    margin-top: var(--space-2);
    font-size: var(--font-size-sm);
    padding: var(--space-1) var(--space-2);
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
}

.admin-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
}

.admin-nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-top: var(--space-10);
}

/* =============================================
   SECTION SPACING (replace inline padding)
   ============================================= */

.section {
    padding-top: var(--space-8);
    padding-bottom: var(--space-12);
}

.section-sm {
    padding-top: var(--space-10);
    padding-bottom: var(--space-12);
}

/* =============================================
   UTILITY CLASSES
   ============================================= */

/* Display */
.d-block { display: block; }
.d-inline { display: inline; }
.d-inline-block { display: inline-block; }
.d-flex { display: flex; }
.d-inline-flex { display: inline-flex; }
.d-grid { display: grid; }
.d-none { display: none; }

/* Flexbox */
.flex-row { flex-direction: row; }
.flex-column { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }
.justify-start { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }
.items-start { align-items: flex-start; }
.items-center { align-items: center; }
.items-end { align-items: flex-end; }
.items-stretch { align-items: stretch; }

/* Gap */
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* Width */
.w-full { width: 100%; }
.w-auto { width: auto; }
.w-fit { width: fit-content; }

/* Height */
.h-full { height: 100%; }
.h-auto { height: auto; }
.h-screen { height: 100vh; }

/* Text Alignment */
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-justify { text-align: justify; }

/* Margins */
.m-0 { margin: 0; }
.m-auto { margin: auto; }
.mx-auto { margin-left: auto; margin-right: auto; }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

/* Paddings */
.p-0 { padding: 0; }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.py-2 { padding-top: var(--space-2); padding-bottom: var(--space-2); }
.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }

/* Inline form for delete buttons, etc. */
.d-inline-form {
    display: inline;
}

/* =============================================
   COOKIE CONSENT BANNER
   ============================================= */

.cookie-consent {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    background-color: var(--surface-elevated);
    border-top: 1px solid var(--border-default);
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.1);
    padding: var(--space-4) var(--space-6);
    animation: slideUp var(--duration-slow) var(--ease-out) both;
    transition: opacity var(--duration-normal) var(--ease-in-out),
                transform var(--duration-normal) var(--ease-in-out);
}

.cookie-consent-hidden {
    opacity: 0;
    transform: translateY(100%);
}

.cookie-consent-inner {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
}

.cookie-consent-text {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: 0;
}

.cookie-consent-actions {
    display: flex;
    gap: var(--space-2);
    flex-shrink: 0;
}

/* =============================================
   RESPONSIVE DESIGN
   ============================================= */

@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }

    .admin-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .container,
    .container-sm,
    .container-lg {
        padding-left: var(--space-4);
        padding-right: var(--space-4);
    }

    /* Mobile nav: show hamburger, hide nav by default */
    .navbar-toggle {
        display: flex;
    }

    .navbar-container {
        flex-wrap: wrap;
    }

    .navbar-nav {
        display: none;
        flex-direction: column;
        width: 100%;
        gap: var(--space-1);
        padding-top: var(--space-4);
        border-top: 1px solid var(--border-default);
    }

    .navbar-nav.open {
        display: flex;
    }

    .navbar-nav li {
        width: 100%;
    }

    .navbar-link {
        display: block;
        width: 100%;
        padding: var(--space-3) var(--space-3);
    }

    .navbar-link::after {
        display: none;
    }

    /* Mobile dropdown: inline instead of absolute */
    .nav-dropdown {
        position: static;
    }

    .dropdown-menu {
        display: none;
        position: static;
        background: transparent;
        border: none;
        box-shadow: none;
        margin-top: 0;
        padding: 0;
        min-width: 0;
    }

    .nav-dropdown:hover .dropdown-menu,
    .navbar-nav.open .nav-dropdown .dropdown-menu {
        display: block;
    }

    .dropdown-menu li a {
        padding: var(--space-2) var(--space-3) var(--space-2) var(--space-8);
    }

    .search-form {
        gap: var(--space-2);
        max-width: 380px;
        margin-left: auto;
        margin-right: auto;
    }

    .search-form .search-input-wrapper {
        flex: 1;
        min-width: 0;
    }

    .search-form .btn {
        padding: var(--space-1-5) var(--space-3);
        font-size: var(--font-size-xs);
        white-space: nowrap;
        flex-shrink: 0;
        align-self: stretch;
    }

    .navbar-nav .btn {
        width: 100%;
        justify-content: center;
    }

    .post-grid {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .modal {
        width: 95%;
    }

    .hero {
        padding: var(--space-12) 0 var(--space-8);
    }

    .hero-title {
        font-size: var(--font-size-5xl);
    }

    .featured-post {
        padding: var(--space-6);
    }

    .featured-post-title {
        font-size: var(--font-size-2xl);
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--space-3);
        text-align: center;
    }

    .article-title {
        font-size: var(--font-size-3xl);
    }

    .article-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-3);
    }

    .login-card {
        padding: var(--space-6);
        margin: var(--space-4);
    }

    .cookie-consent-inner {
        flex-direction: column;
        text-align: center;
    }

    .cookie-consent-actions {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    :root {
        font-size: 14px;
    }

    .container,
    .container-sm,
    .container-lg {
        padding-left: var(--space-5);
        padding-right: var(--space-5);
    }

    .btn:not(.btn-xs):not(.btn-sm):not(.btn-ghost):not(.btn-oauth) {
        width: 100%;
    }

    .card {
        padding: var(--space-4);
    }

    .post-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }

    .error-code {
        font-size: 6rem;
    }
}

/* =============================================
   PRINT STYLES
   ============================================= */

@media print {
    *,
    *::before,
    *::after {
        box-shadow: none !important;
        text-shadow: none !important;
    }

    body {
        background-color: white;
        color: black;
    }

    .navbar,
    .btn,
    .theme-toggle,
    .comment-form,
    .modal,
    .site-footer,
    .cookie-consent {
        display: none !important;
    }

    .post-content {
        color: black;
    }

    a {
        color: black;
    }

    a[href^="http"]::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
    }
}

/* =============================================
   ACCESSIBILITY
   ============================================= */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --border-default: #000000;
        --border-strong: #000000;
    }

    [data-theme="dark"] {
        --border-default: #ffffff;
        --border-strong: #ffffff;
    }
}