/* ==========================================================================
   AI PLATFORM - PREMIUM CSS
   Design System & Component Library
   ========================================================================== */

/* ==========================================================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ========================================================================== */

:root {
    /* Color Palette - AI/Tech Theme */
    --color-primary-50: #f0f9ff;
    --color-primary-100: #e0f2fe;
    --color-primary-200: #bae6fd;
    --color-primary-300: #7dd3fc;
    --color-primary-400: #38bdf8;
    --color-primary-500: #0ea5e9;
    --color-primary-600: #0284c7;
    --color-primary-700: #0369a1;
    --color-primary-800: #075985;
    --color-primary-900: #0c4a6e;

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

    --color-accent-50: #ecfeff;
    --color-accent-100: #cffafe;
    --color-accent-200: #a5f3fc;
    --color-accent-300: #67e8f9;
    --color-accent-400: #22d3ee;
    --color-accent-500: #06b6d4;
    --color-accent-600: #0891b2;
    --color-accent-700: #0e7490;
    --color-accent-800: #155e75;
    --color-accent-900: #164e63;

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

    /* Semantic Colors */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #3b82f6;

    /* Typography Scale */
    --text-hero: clamp(3rem, 8vw, 6rem);        /* 48-96px */
    --text-display: clamp(2.5rem, 5vw, 4rem);   /* 40-64px */
    --text-h1: clamp(2rem, 4vw, 3rem);          /* 32-48px */
    --text-h2: clamp(1.5rem, 3vw, 2.25rem);     /* 24-36px */
    --text-h3: clamp(1.25rem, 2vw, 1.5rem);     /* 20-24px */
    --text-h4: 1.125rem;                         /* 18px */
    --text-body: 1rem;                           /* 16px */
    --text-small: 0.875rem;                      /* 14px */
    --text-xs: 0.75rem;                          /* 12px */

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

    /* Spacing Scale (8px base) */
    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;    /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */
    --space-16: 4rem;     /* 64px */
    --space-20: 5rem;     /* 80px */
    --space-24: 6rem;     /* 96px */
    --space-32: 8rem;     /* 128px */
    --space-40: 10rem;    /* 160px */

    /* Border Radius */
    --radius-sm: 0.375rem;   /* 6px */
    --radius-md: 0.5rem;     /* 8px */
    --radius-lg: 0.75rem;    /* 12px */
    --radius-xl: 1rem;       /* 16px */
    --radius-2xl: 1.5rem;    /* 24px */
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Glow Effects */
    --glow-primary: 0 0 60px rgba(14, 165, 233, 0.4);
    --glow-secondary: 0 0 60px rgba(168, 85, 247, 0.4);
    --glow-accent: 0 0 60px rgba(6, 182, 212, 0.4);
    --glow-lg: 0 0 100px rgba(14, 165, 233, 0.5);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.8s cubic-bezier(0.16, 1, 0.3, 1);

    /* 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 Colors */
.dark {
    --color-bg: #0a0a0a;
    --color-bg-elevated: #171717;
    --color-bg-muted: #262626;
    --color-text-primary: #fafafa;
    --color-text-secondary: #d4d4d4;
    --color-text-muted: #a3a3a3;
    --color-border: #262626;
    --color-border-subtle: #1a1a1a;
}

/* Light Mode Colors */
:root:not(.dark) {
    --color-bg: #ffffff;
    --color-bg-elevated: #fafafa;
    --color-bg-muted: #f5f5f5;
    --color-text-primary: #171717;
    --color-text-secondary: #404040;
    --color-text-muted: #737373;
    --color-border: #e5e5e5;
    --color-border-subtle: #f5f5f5;
}

/* ==========================================================================
   BASE STYLES
   ========================================================================== */

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: var(--text-body);
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg);
    min-height: 100vh;
}

/* Selection Styles */
::selection {
    background: var(--color-primary-500);
    color: white;
}

::-moz-selection {
    background: var(--color-primary-500);
    color: white;
}

/* Scrollbar Styles */
::-webkit-scrollbar {
    width: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--color-neutral-400);
    border-radius: var(--radius-full);
}

.dark ::-webkit-scrollbar-thumb {
    background: var(--color-neutral-700);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-neutral-500);
}

/* ==========================================================================
   ANIMATED GRADIENT BACKGROUNDS
   ========================================================================== */

.gradient-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.dark .gradient-bg {
    background: #0a0a0a;
}

.gradient-mesh {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.3) 0px, transparent 50%),
        radial-gradient(at 50% 0%, rgba(168, 85, 247, 0.3) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(6, 182, 212, 0.3) 0px, transparent 50%);
    opacity: 0;
    animation: gradient-shift 15s ease infinite;
}

.dark .gradient-mesh {
    opacity: 1;
}

@keyframes gradient-shift {
    0%, 100% {
        background:
            radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.3) 0px, transparent 50%),
            radial-gradient(at 50% 0%, rgba(168, 85, 247, 0.3) 0px, transparent 50%),
            radial-gradient(at 100% 0%, rgba(6, 182, 212, 0.3) 0px, transparent 50%);
    }
    50% {
        background:
            radial-gradient(at 100% 100%, rgba(99, 102, 241, 0.3) 0px, transparent 50%),
            radial-gradient(at 50% 100%, rgba(168, 85, 247, 0.3) 0px, transparent 50%),
            radial-gradient(at 0% 100%, rgba(6, 182, 212, 0.3) 0px, transparent 50%);
    }
}

/* Grid Pattern Background */
.grid-pattern {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    mask-image: linear-gradient(to bottom, transparent, black 10%, black 90%, transparent);
}

.dark .grid-pattern {
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
}

/* ==========================================================================
   GLASSMORPHISM EFFECTS
   ========================================================================== */

.glass {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.1);
}

.glass-strong {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.dark .glass {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.dark .glass-strong {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* ==========================================================================
   SCROLL REVEAL ANIMATIONS
   ========================================================================== */

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-smooth),
                transform var(--transition-smooth);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

.reveal-left {
    opacity: 0;
    transform: translateX(-40px);
    transition: all var(--transition-smooth);
}

.reveal-left.active {
    opacity: 1;
    transform: translateX(0);
}

.reveal-right {
    opacity: 0;
    transform: translateX(40px);
    transition: all var(--transition-smooth);
}

.reveal-right.active {
    opacity: 1;
    transform: translateX(0);
}

.reveal-scale {
    opacity: 0;
    transform: scale(0.95);
    transition: all var(--transition-smooth);
}

.reveal-scale.active {
    opacity: 1;
    transform: scale(1);
}

.reveal-blur {
    opacity: 0;
    filter: blur(10px);
    transform: translateY(20px);
    transition: all var(--transition-smooth);
}

.reveal-blur.active {
    opacity: 1;
    filter: blur(0);
    transform: translateY(0);
}

/* Stagger delays */
.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }
.stagger-5 { transition-delay: 0.5s; }
.stagger-6 { transition-delay: 0.6s; }

/* ==========================================================================
   HOVER ANIMATIONS
   ========================================================================== */

.hover-lift {
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.hover-lift:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
}

.hover-zoom {
    overflow: hidden;
}

.hover-zoom img {
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.hover-zoom:hover img {
    transform: scale(1.05);
}

.hover-glow {
    transition: box-shadow var(--transition-base);
}

.hover-glow:hover {
    box-shadow: var(--glow-primary);
}

.hover-shine {
    position: relative;
    overflow: hidden;
}

.hover-shine::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.6s ease;
}

.hover-shine:hover::before {
    left: 100%;
}

/* ==========================================================================
   CONTINUOUS ANIMATIONS
   ========================================================================== */

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.animate-float {
    animation: float 6s ease-in-out infinite;
}

@keyframes pulse-ring {
    0% {
        transform: scale(1);
        opacity: 0.8;
    }
    100% {
        transform: scale(1.5);
        opacity: 0;
    }
}

.pulse-ring {
    animation: pulse-ring 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(14, 165, 233, 0.3);
    }
    50% {
        box-shadow: 0 0 40px rgba(14, 165, 233, 0.6);
    }
}

.animate-pulse-glow {
    animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.animate-rotate {
    animation: rotate 20s linear infinite;
}

@keyframes spin-slow {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.animate-spin-slow {
    animation: spin-slow 30s linear infinite;
}

/* Neural Network Animation */
@keyframes neural-pulse {
    0%, 100% { opacity: 0.2; }
    50% { opacity: 1; }
}

.neural-line {
    animation: neural-pulse 3s ease-in-out infinite;
}

/* ==========================================================================
   COMPONENTS
   ========================================================================== */

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: var(--text-body);
    font-weight: var(--font-medium);
    text-decoration: none;
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary-500), var(--color-secondary-500));
    color: white;
    box-shadow: 0 4px 14px 0 rgba(14, 165, 233, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px 0 rgba(14, 165, 233, 0.5);
}

.btn-secondary {
    background: var(--color-bg-elevated);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-bg-muted);
    transform: translateY(-2px);
}

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

.btn-ghost:hover {
    background: var(--color-bg-muted);
}

/* Cards */
.card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    transition: all var(--transition-base);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.card-glass {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
}

/* Gradient Text */
.text-gradient {
    background: linear-gradient(135deg, var(--color-primary-400), var(--color-secondary-500), var(--color-accent-400));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Badge */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem 0.75rem;
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    border-radius: var(--radius-full);
    background: var(--color-bg-muted);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.badge-primary {
    background: rgba(14, 165, 233, 0.1);
    color: var(--color-primary-500);
    border-color: rgba(14, 165, 233, 0.2);
}

.badge-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
    border-color: rgba(16, 185, 129, 0.2);
}

/* Input */
.input {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: var(--text-body);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-primary);
    transition: all var(--transition-base);
}

.input:focus {
    outline: none;
    border-color: var(--color-primary-500);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

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

.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;
}

.sr-only:focus {
    position: static;
    width: auto;
    height: auto;
    padding: inherit;
    margin: inherit;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

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

/* ==========================================================================
   REDUCED MOTION (REQUIRED FOR ACCESSIBILITY)
   ========================================================================== */

@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;
    }

    .reveal, .reveal-left, .reveal-right, .reveal-scale, .reveal-blur {
        opacity: 1;
        transform: none;
        filter: none;
    }
}

/* ==========================================================================
   PERFORMANCE OPTIMIZATIONS
   ========================================================================== */

section {
    content-visibility: auto;
    contain-intrinsic-size: 0 500px;
}

/* GPU Acceleration */
.animated,
.hover-lift,
.hover-zoom img,
.reveal,
.reveal-left,
.reveal-right,
.reveal-scale {
    transform: translateZ(0);
    will-change: transform;
}

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

@media (max-width: 768px) {
    :root {
        --text-hero: clamp(2rem, 10vw, 3rem);
        --text-display: clamp(1.75rem, 8vw, 2.5rem);
    }

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

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

@media print {
    .no-print {
        display: none !important;
    }

    body {
        background: white;
        color: black;
    }

    .gradient-bg,
    .gradient-mesh,
    .grid-pattern {
        display: none;
    }
}