/* ============================================
   TK AIML Labs - Styles
   Color Scheme: Black, White, Gold
   ============================================ */

/* CSS Variables */
:root {
    /* Colors */
    --color-black: #0a0a0a;
    --color-black-light: #111111;
    --color-black-lighter: #1a1a1a;
    --color-white: #ffffff;
    --color-white-muted: #a0a0a0;
    --color-white-dim: #666666;
    --color-gold: #d4af37;
    --color-gold-light: #f4d03f;
    --color-gold-dark: #c9a227;

    /* Gradients */
    --gradient-gold: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-light) 50%, var(--color-gold-dark) 100%);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.4s ease;
    --transition-slow: 0.8s ease;

    /* Z-index layers */
    --z-canvas: 1;
    --z-overlay: 2;
    --z-content: 10;
    --z-header: 100;
}

/* Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-black);
    color: var(--color-white);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Selection */
::selection {
    background-color: var(--color-gold);
    color: var(--color-black);
}

/* ============================================
   Canvas Background
   ============================================ */
#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-canvas);
    pointer-events: none;
}

/* Gradient Overlay */
.gradient-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-overlay);
    pointer-events: none;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(212, 175, 55, 0.05) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(212, 175, 55, 0.04) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(10, 10, 10, 0.4) 0%, transparent 100%);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    z-index: var(--z-content);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.hero-content {
    text-align: center;
    max-width: 800px;
}

/* ============================================
   Brand / Logo
   ============================================ */
.brand {
    margin-bottom: var(--spacing-lg);
}

.brand-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    animation: float 6s ease-in-out infinite;
}

.brand-icon svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 0 20px rgba(212, 175, 55, 0.3));
}

.brand-name {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.brand-tk {
    color: var(--color-white);
    display: inline-block;
}

.brand-aiml {
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
    position: relative;
}

.brand-aiml::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--gradient-gold);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition-slow);
}

.brand:hover .brand-aiml::after {
    transform: scaleX(1);
    transform-origin: left;
}

.brand-labs {
    color: var(--color-white-muted);
    font-weight: 300;
    display: inline-block;
    margin-left: 0.1em;
}

/* ============================================
   Divider
   ============================================ */
.divider {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.divider-line {
    width: 60px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
    opacity: 0.5;
}

.divider-dot {
    width: 6px;
    height: 6px;
    background: var(--color-gold);
    border-radius: 50%;
    animation: pulse-gold 2s ease-in-out infinite;
}

/* ============================================
   Vision Statement
   ============================================ */
.vision {
    margin-bottom: var(--spacing-lg);
}

.vision-text {
    font-size: clamp(1rem, 2.5vw, 1.35rem);
    color: var(--color-white-muted);
    line-height: 1.8;
    font-weight: 300;
    letter-spacing: 0.02em;
}

.vision-highlight {
    color: var(--color-white);
    font-weight: 500;
    position: relative;
    display: inline-block;
}

.vision-highlight::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--gradient-gold);
    opacity: 0.6;
}

/* ============================================
   Mathematical Notation
   ============================================ */
.notation {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.notation-text {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    color: var(--color-white-dim);
    opacity: 0.6;
    transition: opacity var(--transition-fast), color var(--transition-fast);
}

.notation-text:hover {
    opacity: 1;
    color: var(--color-gold);
}

/* ============================================
   Scroll Hint
   ============================================ */
.scroll-hint {
    position: absolute;
    bottom: 5rem;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0.4;
    transition: opacity var(--transition-fast);
}

.scroll-hint:hover {
    opacity: 0.8;
}

.mouse {
    width: 24px;
    height: 40px;
    border: 2px solid var(--color-white-muted);
    border-radius: 12px;
    position: relative;
}

.wheel {
    width: 3px;
    height: 8px;
    background: var(--color-gold);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll-wheel 2s ease-in-out infinite;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: center;
    z-index: var(--z-content);
    font-size: 0.75rem;
    color: var(--color-white-dim);
    letter-spacing: 0.05em;
}

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

@keyframes pulse-gold {
    0%, 100% {
        opacity: 0.5;
        box-shadow: 0 0 0 0 rgba(212, 175, 55, 0.4);
    }
    50% {
        opacity: 1;
        box-shadow: 0 0 0 10px rgba(212, 175, 55, 0);
    }
}

@keyframes scroll-wheel {
    0% {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }
    100% {
        transform: translateX(-50%) translateY(12px);
        opacity: 0;
    }
}

/* ============================================
   Animation Entrance Effects
   ============================================ */
[data-animate] {
    opacity: 0;
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

[data-animate="fade-up"] {
    transform: translateY(30px);
}

[data-animate="fade"] {
    transform: translateY(0);
}

[data-animate].animated {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .brand-icon {
        width: 60px;
        height: 60px;
    }

    .divider-line {
        width: 40px;
    }

    .vision-text br {
        display: none;
    }

    .scroll-hint {
        display: none;
    }

    .footer {
        position: relative;
        margin-top: var(--spacing-xl);
    }
}

@media (max-width: 480px) {
    .brand-name {
        display: flex;
        flex-direction: column;
        gap: 0.1em;
    }

    .brand-labs {
        margin-left: 0;
    }
}

/* ============================================
   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: 0;
}