/**
 * Roof Nexus Design System
 * Modern futuristic dark "AI-ish" UI
 * Inspired by antigravity aesthetic: dark gradients, glass surfaces, subtle glow
 */

/* ================================================
   CSS CUSTOM PROPERTIES / DESIGN TOKENS
   ================================================ */

:root {
    /* === COLOR PALETTE === */

    /* Primary brand colors */
    --color-primary-50: #e6f4ff;
    --color-primary-100: #bae0ff;
    --color-primary-200: #8ccaff;
    --color-primary-300: #5eb3ff;
    --color-primary-400: #3a9eff;
    --color-primary-500: #1a8aff;
    --color-primary-600: #0070e0;
    --color-primary-700: #0058b3;
    --color-primary-800: #004186;
    --color-primary-900: #002a59;

    /* Accent colors - Electric cyan */
    --color-accent-50: #e0feff;
    --color-accent-100: #b3fcff;
    --color-accent-200: #80f9ff;
    --color-accent-300: #4df5ff;
    --color-accent-400: #26f2ff;
    --color-accent-500: #00e5ff;
    --color-accent-600: #00b8cc;
    --color-accent-700: #008a99;
    --color-accent-800: #005c66;
    --color-accent-900: #002e33;

    /* Neutral colors - Cool grays */
    --color-neutral-0: #ffffff;
    --color-neutral-50: #f8fafc;
    --color-neutral-100: #f1f5f9;
    --color-neutral-200: #e2e8f0;
    --color-neutral-300: #cbd5e1;
    --color-neutral-400: #94a3b8;
    --color-neutral-500: #64748b;
    --color-neutral-600: #475569;
    --color-neutral-700: #334155;
    --color-neutral-800: #1e293b;
    --color-neutral-900: #0f172a;
    --color-neutral-950: #020617;

    /* Dark theme base colors */
    --color-dark-bg: #030712;
    --color-dark-surface: #0a0f1a;
    --color-dark-elevated: #111827;
    --color-dark-card: #151c2c;
    --color-dark-border: rgba(255, 255, 255, 0.06);
    --color-dark-border-subtle: rgba(255, 255, 255, 0.03);
    --color-dark-border-strong: rgba(255, 255, 255, 0.12);

    /* Semantic colors */
    --color-success-500: #22c55e;
    --color-success-600: #16a34a;
    --color-warning-500: #eab308;
    --color-warning-600: #ca8a04;
    --color-error-500: #ef4444;
    --color-error-600: #dc2626;
    --color-info-500: #3b82f6;
    --color-info-600: #2563eb;

    /* === GRADIENTS === */

    /* Background gradients */
    --gradient-dark-radial: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(26, 138, 255, 0.15), transparent);
    --gradient-dark-mesh:
        radial-gradient(at 40% 20%, rgba(26, 138, 255, 0.08) 0px, transparent 50%),
        radial-gradient(at 80% 0%, rgba(0, 229, 255, 0.06) 0px, transparent 50%),
        radial-gradient(at 0% 50%, rgba(26, 138, 255, 0.05) 0px, transparent 50%),
        radial-gradient(at 80% 100%, rgba(0, 229, 255, 0.04) 0px, transparent 50%),
        radial-gradient(at 0% 100%, rgba(26, 138, 255, 0.03) 0px, transparent 50%);

    /* Element gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary-500) 0%, var(--color-primary-600) 100%);
    --gradient-accent: linear-gradient(135deg, var(--color-accent-500) 0%, var(--color-primary-500) 100%);
    --gradient-glow: linear-gradient(135deg, rgba(26, 138, 255, 0.2) 0%, rgba(0, 229, 255, 0.1) 100%);
    --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.02) 100%);
    --gradient-glass-strong: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    --gradient-hero: linear-gradient(180deg, var(--color-dark-bg) 0%, var(--color-dark-surface) 100%);
    --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0.01) 100%);

    /* === GLOW EFFECTS === */
    --glow-primary: 0 0 20px rgba(26, 138, 255, 0.3), 0 0 40px rgba(26, 138, 255, 0.1);
    --glow-accent: 0 0 20px rgba(0, 229, 255, 0.3), 0 0 40px rgba(0, 229, 255, 0.1);
    --glow-primary-subtle: 0 0 15px rgba(26, 138, 255, 0.15);
    --glow-accent-subtle: 0 0 15px rgba(0, 229, 255, 0.15);
    --glow-text: 0 0 30px rgba(26, 138, 255, 0.4);

    /* === SHADOWS === */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.3), 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.3), 0 4px 8px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 16px 32px rgba(0, 0, 0, 0.4), 0 8px 16px rgba(0, 0, 0, 0.2);
    --shadow-2xl: 0 24px 48px rgba(0, 0, 0, 0.5);
    --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.3);

    /* Elevated shadows with glow */
    --shadow-elevated: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 0 1px var(--color-dark-border);
    --shadow-elevated-glow: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 20px rgba(26, 138, 255, 0.1);

    /* === TYPOGRAPHY === */

    /* Font families */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-display: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Monaco, Consolas, monospace;

    /* Font sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
    --text-7xl: 4.5rem;
    --text-8xl: 6rem;

    /* Line heights */
    --leading-none: 1;
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;

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

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

    /* === SPACING === */
    --space-0: 0;
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;
    --space-40: 10rem;
    --space-48: 12rem;
    --space-64: 16rem;

    /* === BORDER RADIUS === */
    --radius-none: 0;
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-3xl: 1.5rem;
    --radius-full: 9999px;

    /* === TRANSITIONS === */
    --duration-75: 75ms;
    --duration-100: 100ms;
    --duration-150: 150ms;
    --duration-200: 200ms;
    --duration-300: 300ms;
    --duration-500: 500ms;
    --duration-700: 700ms;
    --duration-1000: 1000ms;

    /* Easing functions */
    --ease-linear: linear;
    --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-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --ease-elastic: cubic-bezier(0.68, -0.6, 0.32, 1.6);

    /* Standard transitions */
    --transition-fast: all var(--duration-150) var(--ease-out);
    --transition-base: all var(--duration-200) var(--ease-out);
    --transition-slow: all var(--duration-300) var(--ease-out);
    --transition-colors: color var(--duration-200) var(--ease-out), background-color var(--duration-200) var(--ease-out), border-color var(--duration-200) var(--ease-out);
    --transition-transform: transform var(--duration-200) var(--ease-out);
    --transition-opacity: opacity var(--duration-200) var(--ease-out);

    /* === Z-INDEX SCALE === */
    --z-behind: -1;
    --z-base: 0;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-drawer: 400;
    --z-modal: 500;
    --z-toast: 600;
    --z-tooltip: 700;

    /* === LAYOUT === */
    --container-xs: 20rem;
    --container-sm: 24rem;
    --container-md: 28rem;
    --container-lg: 32rem;
    --container-xl: 36rem;
    --container-2xl: 42rem;
    --container-3xl: 48rem;
    --container-4xl: 56rem;
    --container-5xl: 64rem;
    --container-6xl: 72rem;
    --container-7xl: 80rem;
    --container-full: 100%;

    /* === GLASS MORPHISM === */
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-bg-strong: rgba(255, 255, 255, 0.06);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-blur: blur(20px);
    --glass-blur-strong: blur(40px);

    /* === SHORTHAND ALIASES === */
    /* For compatibility with timeline.css, chat.css, notifications.css */

    /* Color aliases */
    --primary: var(--color-primary-500);
    --primary-rgb: 26, 138, 255;
    --accent: var(--color-accent-500);
    --danger: var(--color-error-500);
    --success: var(--color-success-500);
    --warning: var(--color-warning-500);

    /* Text color aliases */
    --text-primary: var(--color-neutral-100);
    --text-secondary: var(--color-neutral-400);
    --text-tertiary: var(--color-neutral-500);
    --color-text-primary: var(--color-neutral-100);
    --color-text-secondary: var(--color-neutral-400);

    /* Surface color aliases */
    --surface-primary: var(--color-dark-surface);
    --surface-secondary: var(--color-dark-elevated);
    --surface-tertiary: var(--color-dark-card);
    --color-bg-secondary: var(--color-dark-elevated);

    /* Border aliases */
    --border-primary: var(--color-dark-border-strong);
    --border-subtle: var(--color-dark-border-subtle);
    --border-color: var(--color-dark-border);

    /* Spacing aliases (for chat.css compatibility) */
    --spacing-1: var(--space-1);
    --spacing-2: var(--space-2);
    --spacing-3: var(--space-3);
    --spacing-4: var(--space-4);

    /* Additional semantic colors */
    --color-primary: var(--color-primary-500);
    --color-bg-primary: var(--color-dark-bg);

    /* Extended color aliases for chat.css and other components */
    --color-primary-dark: var(--color-primary-700);
    --color-primary-light: var(--color-primary-300);
    --gradient-brand: var(--gradient-primary);
    --spacing-1-5: 0.375rem;
    --spacing-5: var(--space-5);
    --spacing-6: var(--space-6);
    --spacing-8: var(--space-8);

    /* Third-party brand colors */
    --color-discord: #5865F2;
    --color-discord-rgb: 88, 101, 242;
    --color-slack: #4A154B;
    --color-google: #4285F4;

    /* Calendar/light theme compatibility (with dark overrides) */
    --bg-primary: var(--color-dark-bg);
    --bg-secondary: var(--color-dark-surface);
    --bg-tertiary: var(--color-dark-elevated);
    --primary-color: var(--color-primary-500);

    /* Additional icon colors for timeline */
    --color-purple-500: #a855f7;
    --color-orange-500: #f97316;
    --color-cyan-500: #06b6d4;
    --color-gray-500: #6b7280;
}

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

*, *::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(--text-base);
    font-weight: var(--font-normal);
    line-height: var(--leading-normal);
    color: var(--color-neutral-200);
    background-color: var(--color-dark-bg);
    min-height: 100vh;
}

/* Dark mesh background for body */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-dark-mesh);
    pointer-events: none;
    z-index: var(--z-behind);
}

/* Selection */
::selection {
    background-color: rgba(26, 138, 255, 0.3);
    color: var(--color-neutral-0);
}

/* Links */
a {
    color: var(--color-primary-400);
    text-decoration: none;
    transition: var(--transition-colors);
}

a:hover {
    color: var(--color-primary-300);
}

/* Images */
img, svg {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
}

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

/* Remove default button styles */
button {
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
}

/* Form elements */
input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

/* Lists */
ul, ol {
    list-style: none;
}

/* Tables */
table {
    border-collapse: collapse;
    width: 100%;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-dark-surface);
}

::-webkit-scrollbar-thumb {
    background: var(--color-neutral-700);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-neutral-600);
}

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

.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-2xl { font-size: var(--text-2xl); }
.text-3xl { font-size: var(--text-3xl); }
.text-4xl { font-size: var(--text-4xl); }
.text-5xl { font-size: var(--text-5xl); }
.text-6xl { font-size: var(--text-6xl); }
.text-7xl { font-size: var(--text-7xl); }

.font-light { font-weight: var(--font-light); }
.font-normal { font-weight: var(--font-normal); }
.font-medium { font-weight: var(--font-medium); }
.font-semibold { font-weight: var(--font-semibold); }
.font-bold { font-weight: var(--font-bold); }
.font-extrabold { font-weight: var(--font-extrabold); }

.leading-none { line-height: var(--leading-none); }
.leading-tight { line-height: var(--leading-tight); }
.leading-snug { line-height: var(--leading-snug); }
.leading-normal { line-height: var(--leading-normal); }
.leading-relaxed { line-height: var(--leading-relaxed); }

.tracking-tight { letter-spacing: var(--tracking-tight); }
.tracking-normal { letter-spacing: var(--tracking-normal); }
.tracking-wide { letter-spacing: var(--tracking-wide); }
.tracking-wider { letter-spacing: var(--tracking-wider); }

/* Display headings */
.heading-display {
    font-family: var(--font-display);
    font-weight: var(--font-bold);
    letter-spacing: var(--tracking-tight);
    line-height: var(--leading-tight);
    color: var(--color-neutral-0);
}

/* Gradient text */
.text-gradient {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-gradient-primary {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Glow text */
.text-glow {
    text-shadow: var(--glow-text);
}

/* Color utilities */
.text-white { color: var(--color-neutral-0); }
.text-muted { color: var(--color-neutral-400); }
.text-subtle { color: var(--color-neutral-500); }
.text-primary { color: var(--color-primary-400); }
.text-accent { color: var(--color-accent-400); }
.text-success { color: var(--color-success-500); }
.text-warning { color: var(--color-warning-500); }
.text-error { color: var(--color-error-500); }

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

.container {
    width: 100%;
    max-width: var(--container-7xl);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
}

.container-sm { max-width: var(--container-4xl); }
.container-lg { max-width: var(--container-6xl); }
.container-xl { max-width: var(--container-7xl); }

/* Flexbox */
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.flex-wrap { flex-wrap: wrap; }
.items-start { align-items: flex-start; }
.items-center { align-items: center; }
.items-end { align-items: flex-end; }
.items-stretch { align-items: stretch; }
.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; }
.flex-1 { flex: 1 1 0%; }
.flex-auto { flex: 1 1 auto; }
.flex-none { flex: none; }
.flex-shrink-0 { flex-shrink: 0; }

/* Grid */
.grid { display: grid; }
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-cols-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.grid-cols-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

/* 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-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }
.gap-10 { gap: var(--space-10); }
.gap-12 { gap: var(--space-12); }
.gap-16 { gap: var(--space-16); }

/* Spacing */
.p-0 { padding: var(--space-0); }
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-5 { padding: var(--space-5); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }
.p-10 { padding: var(--space-10); }
.p-12 { padding: var(--space-12); }

.px-1 { padding-left: var(--space-1); padding-right: var(--space-1); }
.px-2 { padding-left: var(--space-2); padding-right: var(--space-2); }
.px-3 { padding-left: var(--space-3); padding-right: var(--space-3); }
.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.px-5 { padding-left: var(--space-5); padding-right: var(--space-5); }
.px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }
.px-8 { padding-left: var(--space-8); padding-right: var(--space-8); }

.py-1 { padding-top: var(--space-1); padding-bottom: var(--space-1); }
.py-2 { padding-top: var(--space-2); padding-bottom: var(--space-2); }
.py-3 { padding-top: var(--space-3); padding-bottom: var(--space-3); }
.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.py-5 { padding-top: var(--space-5); padding-bottom: var(--space-5); }
.py-6 { padding-top: var(--space-6); padding-bottom: var(--space-6); }
.py-8 { padding-top: var(--space-8); padding-bottom: var(--space-8); }
.py-10 { padding-top: var(--space-10); padding-bottom: var(--space-10); }
.py-12 { padding-top: var(--space-12); padding-bottom: var(--space-12); }
.py-16 { padding-top: var(--space-16); padding-bottom: var(--space-16); }
.py-20 { padding-top: var(--space-20); padding-bottom: var(--space-20); }
.py-24 { padding-top: var(--space-24); padding-bottom: var(--space-24); }

.m-auto { margin: auto; }
.mx-auto { margin-left: auto; margin-right: auto; }
.my-auto { margin-top: auto; margin-bottom: auto; }

.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-10 { margin-top: var(--space-10); }
.mt-12 { margin-top: var(--space-12); }
.mt-16 { margin-top: var(--space-16); }

.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-10 { margin-bottom: var(--space-10); }
.mb-12 { margin-bottom: var(--space-12); }
.mb-16 { margin-bottom: var(--space-16); }

/* Sizing */
.w-full { width: 100%; }
.w-auto { width: auto; }
.h-full { height: 100%; }
.h-auto { height: auto; }
.h-screen { height: 100vh; }
.min-h-screen { min-height: 100vh; }

/* Position */
.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.sticky { position: sticky; }
.inset-0 { top: 0; right: 0; bottom: 0; left: 0; }
.top-0 { top: 0; }
.right-0 { right: 0; }
.bottom-0 { bottom: 0; }
.left-0 { left: 0; }

/* Overflow */
.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }
.overflow-x-auto { overflow-x: auto; }
.overflow-y-auto { overflow-y: auto; }

/* Display */
.block { display: block; }
.inline-block { display: inline-block; }
.hidden { display: none; }

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

/* Border radius */
.rounded-none { border-radius: var(--radius-none); }
.rounded-sm { border-radius: var(--radius-sm); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-2xl { border-radius: var(--radius-2xl); }
.rounded-3xl { border-radius: var(--radius-3xl); }
.rounded-full { border-radius: var(--radius-full); }

/* ================================================
   RESPONSIVE BREAKPOINTS
   ================================================ */

/* Mobile first approach */
/* sm: 640px */
@media (min-width: 640px) {
    .sm\:flex { display: flex; }
    .sm\:hidden { display: none; }
    .sm\:block { display: block; }
    .sm\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .sm\:text-left { text-align: left; }
    .sm\:text-center { text-align: center; }
}

/* md: 768px */
@media (min-width: 768px) {
    .md\:flex { display: flex; }
    .md\:hidden { display: none; }
    .md\:block { display: block; }
    .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .md\:flex-row { flex-direction: row; }
    .md\:items-center { align-items: center; }
    .md\:text-left { text-align: left; }
    .md\:gap-8 { gap: var(--space-8); }
    .md\:gap-12 { gap: var(--space-12); }
    .md\:py-20 { padding-top: var(--space-20); padding-bottom: var(--space-20); }
    .md\:py-24 { padding-top: var(--space-24); padding-bottom: var(--space-24); }
    .md\:px-8 { padding-left: var(--space-8); padding-right: var(--space-8); }
}

/* lg: 1024px */
@media (min-width: 1024px) {
    .lg\:flex { display: flex; }
    .lg\:hidden { display: none; }
    .lg\:block { display: block; }
    .lg\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .lg\:flex-row { flex-direction: row; }
    .lg\:gap-12 { gap: var(--space-12); }
    .lg\:gap-16 { gap: var(--space-16); }
    .lg\:py-32 { padding-top: var(--space-32); padding-bottom: var(--space-32); }
    .lg\:text-6xl { font-size: var(--text-6xl); }
    .lg\:text-7xl { font-size: var(--text-7xl); }
}

/* xl: 1280px */
@media (min-width: 1280px) {
    .xl\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .xl\:grid-cols-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
    .xl\:gap-16 { gap: var(--space-16); }
}

/* ================================================
   ANIMATION UTILITIES
   ================================================ */

/* Fade animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

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

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

/* Slide animations */
@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideOutRight {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

/* Glow pulse animation */
@keyframes glowPulse {
    0%, 100% {
        box-shadow: 0 0 20px rgba(26, 138, 255, 0.2);
    }
    50% {
        box-shadow: 0 0 30px rgba(26, 138, 255, 0.4);
    }
}

/* Float animation */
@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* Shimmer animation */
@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

/* Spin animation */
@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Animation classes */
.animate-fade-in { animation: fadeIn var(--duration-300) var(--ease-out); }
.animate-fade-in-up { animation: fadeInUp var(--duration-500) var(--ease-out); }
.animate-fade-in-down { animation: fadeInDown var(--duration-500) var(--ease-out); }
.animate-scale-in { animation: scaleIn var(--duration-300) var(--ease-out); }
.animate-slide-in-right { animation: slideInRight var(--duration-300) var(--ease-out); }
.animate-glow-pulse { animation: glowPulse 2s ease-in-out infinite; }
.animate-float { animation: float 3s ease-in-out infinite; }
.animate-spin { animation: spin 1s linear infinite; }

/* Staggered animation delays */
.delay-75 { animation-delay: 75ms; }
.delay-100 { animation-delay: 100ms; }
.delay-150 { animation-delay: 150ms; }
.delay-200 { animation-delay: 200ms; }
.delay-300 { animation-delay: 300ms; }
.delay-500 { animation-delay: 500ms; }
.delay-700 { animation-delay: 700ms; }
.delay-1000 { animation-delay: 1000ms; }

/* Animation fill mode */
.fill-forwards { animation-fill-mode: forwards; }
.fill-backwards { animation-fill-mode: backwards; }
.fill-both { animation-fill-mode: both; }

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

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

/* Cursor */
.cursor-pointer { cursor: pointer; }
.cursor-not-allowed { cursor: not-allowed; }

/* Opacity */
.opacity-0 { opacity: 0; }
.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }
.opacity-100 { opacity: 1; }

/* Pointer events */
.pointer-events-none { pointer-events: none; }
.pointer-events-auto { pointer-events: auto; }

/* User select */
.select-none { user-select: none; }
.select-text { user-select: text; }
.select-all { user-select: all; }

/* Whitespace */
.whitespace-nowrap { white-space: nowrap; }
.whitespace-pre-wrap { white-space: pre-wrap; }

/* Truncate */
.truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Line clamp */
.line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.line-clamp-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Transition utilities */
.transition-none { transition: none; }
.transition-all { transition: var(--transition-base); }
.transition-colors { transition: var(--transition-colors); }
.transition-opacity { transition: var(--transition-opacity); }
.transition-transform { transition: var(--transition-transform); }

/* Transform utilities */
.translate-y-0 { transform: translateY(0); }
.translate-y-1 { transform: translateY(var(--space-1)); }
.-translate-y-1 { transform: translateY(calc(var(--space-1) * -1)); }
.scale-100 { transform: scale(1); }
.scale-105 { transform: scale(1.05); }
.scale-110 { transform: scale(1.1); }

/* Hover transform */
.hover\:scale-105:hover { transform: scale(1.05); }
.hover\:-translate-y-1:hover { transform: translateY(-4px); }