/* ==========================================================================
   devflowbytegrid.com - Main Stylesheet
   Tesla-inspired Design System with Computer Science Aesthetic
   ========================================================================== */

/* CSS Variables - Design Tokens */
:root {
    /* Color Palette - Inspired by Tesla & Modern Tech */
    --color-bg-primary: #0a0a0a;
    --color-bg-secondary: #111111;
    --color-bg-tertiary: #1a1a1a;
    --color-bg-elevated: #161616;
    --color-surface: rgba(255, 255, 255, 0.04);
    --color-surface-hover: rgba(255, 255, 255, 0.08);

    --color-accent: #00d4ff;
    --color-accent-2: #7c3aed;
    --color-accent-3: #06b6d4;
    --color-accent-glow: rgba(0, 212, 255, 0.5);

    --color-text-primary: #ffffff;
    --color-text-secondary: #b8b8b8;
    --color-text-tertiary: #6b6b6b;
    --color-text-muted: #4a4a4a;

    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-hover: rgba(0, 212, 255, 0.3);

    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #7c3aed 100%);
    --gradient-secondary: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
    --gradient-tertiary: linear-gradient(135deg, #7c3aed 0%, #ec4899 100%);
    --gradient-mesh: radial-gradient(at 27% 37%, hsla(215, 98%, 61%, 1) 0px, transparent 50%),
                     radial-gradient(at 97% 21%, hsla(256, 96%, 67%, 1) 0px, transparent 50%),
                     radial-gradient(at 52% 99%, hsla(354, 98%, 61%, 1) 0px, transparent 50%),
                     radial-gradient(at 10% 29%, hsla(256, 96%, 67%, 1) 0px, transparent 50%),
                     radial-gradient(at 97% 96%, hsla(38, 60%, 74%, 1) 0px, transparent 50%),
                     radial-gradient(at 33% 50%, hsla(222, 67%, 73%, 1) 0px, transparent 50%),
                     radial-gradient(at 79% 53%, hsla(343, 68%, 79%, 1) 0px, transparent 50%);
    --gradient-grid: linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
                     linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);

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

    --fs-xs: 0.75rem;
    --fs-sm: 0.875rem;
    --fs-base: 1rem;
    --fs-md: 1.125rem;
    --fs-lg: 1.25rem;
    --fs-xl: 1.5rem;
    --fs-2xl: 2rem;
    --fs-3xl: 2.5rem;
    --fs-4xl: 3.5rem;
    --fs-5xl: 4.5rem;
    --fs-6xl: 6rem;
    --fs-hero: clamp(0.7rem, 0.9vw, 0.875rem);

    /* Spacing */
    --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;

    /* Layout */
    --container-max: 1440px;
    --container-padding: clamp(1rem, 4vw, 3rem);
    --header-height: 80px;

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 32px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 60px rgba(0, 212, 255, 0.3);
    --shadow-glow-purple: 0 0 60px rgba(124, 58, 237, 0.3);

    /* 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: 600ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 800ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
}

/* Animated Background Grid */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: var(--gradient-grid);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: 0;
    animation: gridMove 20s linear infinite;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

@keyframes gridMove {
    0% { background-position: 0 0; }
    100% { background-position: 60px 60px; }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

h1 { font-size: var(--fs-hero); }
h2 { font-size: var(--fs-4xl); }
h3 { font-size: var(--fs-2xl); }
h4 { font-size: var(--fs-xl); }
h5 { font-size: var(--fs-lg); }
h6 { font-size: var(--fs-base); }

p {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-base);
}

a:hover { color: var(--color-accent); }

::selection {
    background: var(--color-accent);
    color: var(--color-bg-primary);
}

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

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

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--color-accent), var(--color-accent-2));
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--color-accent-2), var(--color-accent));
}

/* Layout */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    position: relative;
    z-index: 1;
}

.section {
    padding: var(--space-32) 0;
    position: relative;
}

.section-sm { padding: var(--space-20) 0; }
.section-lg { padding: var(--space-32) 0; }

/* ==========================================================================
   HEADER & NAVIGATION
   ========================================================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    z-index: 1000;
    background: rgba(10, 10, 10, 0.7);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.site-header.scrolled {
    background: rgba(10, 10, 10, 0.92);
    border-bottom-color: var(--color-border-hover);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: var(--fs-lg);
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}

.logo svg {
    width: 36px;
    height: 36px;
    transition: transform var(--transition-spring);
}

.logo:hover svg {
    transform: rotate(180deg) scale(1.1);
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1;
}

.logo-text small {
    font-family: var(--font-mono);
    font-size: 0.625rem;
    color: var(--color-accent);
    font-weight: 400;
    margin-top: 2px;
    letter-spacing: 0.1em;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    list-style: none;
}

.nav-link {
    position: relative;
    padding: var(--space-2) var(--space-4);
    font-size: var(--fs-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text-primary);
}

.nav-link:hover::before,
.nav-link.active::before {
    width: 60%;
}

.nav-cta {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-left: var(--space-4);
}

.mobile-toggle {
    display: none;
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
    padding: var(--space-2);
    border-radius: var(--radius-sm);
    cursor: pointer;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
}

.mobile-toggle svg {
    width: 20px;
    height: 20px;
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-family: var(--font-primary);
    font-size: var(--fs-sm);
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
    text-decoration: none;
    letter-spacing: 0.01em;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-bg-primary);
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
}

.btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #7c3aed 0%, #00d4ff 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: 0;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 212, 255, 0.5);
}

.btn-primary:hover::before {
    opacity: 1;
}

.btn-primary > * { position: relative; z-index: 1; }

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    backdrop-filter: blur(10px);
}

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

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

.btn-ghost:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
    background: rgba(0, 212, 255, 0.05);
}

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

.btn-icon {
    width: 16px;
    height: 16px;
    transition: transform var(--transition-base);
}

.btn:hover .btn-icon {
    transform: translateX(4px);
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: calc(var(--header-height) + var(--space-16)) 0 var(--space-16);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: orbFloat 12s ease-in-out infinite;
}

.hero-orb-1 {
    width: 600px;
    height: 600px;
    background: var(--color-accent);
    top: -200px;
    right: -100px;
    animation-delay: 0s;
}

.hero-orb-2 {
    width: 500px;
    height: 500px;
    background: var(--color-accent-2);
    bottom: -150px;
    left: -100px;
    animation-delay: 4s;
}

.hero-orb-3 {
    width: 400px;
    height: 400px;
    background: var(--color-accent-3);
    top: 30%;
    left: 40%;
    animation-delay: 8s;
}

@keyframes orbFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(60px, -40px) scale(1.1); }
    66% { transform: translate(-40px, 60px) scale(0.95); }
}

.hero-content {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: var(--radius-full);
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-accent);
    margin-bottom: var(--space-6);
    animation: fadeInUp 0.8s ease-out;
}

.hero-badge-dot {
    width: 8px;
    height: 8px;
    background: var(--color-accent);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.3); }
}

.hero-title {
    font-size: var(--fs-hero);
    font-weight: 800;
    line-height: 1;
    margin-bottom: var(--space-6);
    animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-title .gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    display: inline-block;
}

.hero-title .cursor {
    display: inline-block;
    width: 0.05em;
    background: var(--color-accent);
    margin-left: 0.1em;
    animation: blink 1s infinite;
    height: 1em;
    vertical-align: middle;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.hero-subtitle {
    font-size: var(--fs-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-8);
    max-width: 640px;
    animation: fadeInUp 1s ease-out 0.4s both;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    margin-bottom: var(--space-12);
    animation: fadeInUp 1s ease-out 0.6s both;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-border);
    animation: fadeInUp 1s ease-out 0.8s both;
}

.stat {
    position: relative;
}

.stat-value {
    font-family: var(--font-display);
    font-size: var(--fs-3xl);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    line-height: 1;
    margin-bottom: var(--space-2);
    letter-spacing: -0.02em;
}

.stat-value::after {
    content: attr(data-suffix);
    font-size: var(--fs-xl);
    background: none;
    -webkit-text-fill-color: var(--color-accent);
    color: var(--color-accent);
    margin-left: 2px;
}

.stat-label {
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Hero Visual */
.hero-visual {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    max-width: 600px;
    margin-left: auto;
    animation: fadeIn 1.5s ease-out 0.4s both;
}

.hero-svg-container {
    position: absolute;
    inset: 0;
    animation: rotate 60s linear infinite;
}

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

.hero-card {
    position: absolute;
    background: rgba(22, 22, 22, 0.85);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    box-shadow: var(--shadow-lg);
    animation: float 6s ease-in-out infinite;
    z-index: 3;
}

.hero-card-1 {
    top: 10%;
    left: -10%;
    width: 200px;
    animation-delay: 0s;
}

.hero-card-2 {
    top: 50%;
    right: -10%;
    width: 220px;
    animation-delay: 1.5s;
}

.hero-card-3 {
    bottom: 5%;
    left: 15%;
    width: 240px;
    animation-delay: 3s;
}

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

.hero-card-header {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-3);
}

.hero-card-icon {
    width: 32px;
    height: 32px;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-card-icon svg {
    width: 18px;
    height: 18px;
    color: var(--color-bg-primary);
}

.hero-card-title {
    font-size: var(--fs-sm);
    font-weight: 600;
}

.hero-card-value {
    font-family: var(--font-display);
    font-size: var(--fs-2xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

.hero-card-bar {
    height: 4px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-top: var(--space-3);
}

.hero-card-bar-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    width: 0;
    animation: fillBar 2s ease-out forwards;
}

@keyframes fillBar {
    to { width: var(--bar-width, 75%); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* ==========================================================================
   PAGE HERO (Sub-pages)
   ========================================================================== */
.page-hero {
    padding: calc(var(--header-height) + var(--space-20)) 0 var(--space-16);
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid var(--color-border);
}

.page-hero-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-mesh);
    opacity: 0.15;
    filter: blur(80px);
    z-index: 0;
}

.page-hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.page-hero-eyebrow {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.3em;
    margin-bottom: var(--space-4);
}

.page-hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    margin-bottom: var(--space-4);
    line-height: 1.05;
}

.page-hero-subtitle {
    font-size: var(--fs-lg);
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

.breadcrumb {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    margin-top: var(--space-6);
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-text-tertiary);
}

.breadcrumb a {
    color: var(--color-text-secondary);
}

.breadcrumb a:hover {
    color: var(--color-accent);
}

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

/* ==========================================================================
   SECTION HEADERS
   ========================================================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    margin-bottom: var(--space-4);
}

.section-eyebrow::before,
.section-eyebrow::after {
    content: '';
    width: 24px;
    height: 1px;
    background: var(--color-accent);
}

.section-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    margin-bottom: var(--space-4);
    line-height: 1.1;
}

.section-subtitle {
    font-size: var(--fs-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ==========================================================================
   CARD COMPONENTS
   ========================================================================== */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.card:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.card:hover::before {
    transform: scaleX(1);
}

.card-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-5);
    position: relative;
    overflow: hidden;
    transition: transform var(--transition-spring);
}

.card:hover .card-icon {
    transform: scale(1.1) rotate(-5deg);
}

.card-icon::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transform: translateX(-100%);
    transition: transform var(--transition-slow);
}

.card:hover .card-icon::before {
    transform: translateX(100%);
}

.card-icon svg {
    width: 28px;
    height: 28px;
    color: var(--color-bg-primary);
    position: relative;
    z-index: 1;
}

.card-title {
    font-size: var(--fs-xl);
    font-weight: 700;
    margin-bottom: var(--space-3);
    color: var(--color-text-primary);
}

.card-description {
    font-size: var(--fs-base);
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-4);
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-accent);
    font-size: var(--fs-sm);
    font-weight: 600;
    transition: gap var(--transition-base);
}

.card-link:hover {
    gap: var(--space-3);
}

.card-link svg {
    width: 14px;
    height: 14px;
}

/* ==========================================================================
   GRIDS
   ========================================================================== */
.grid {
    display: grid;
    gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--space-20) 0 var(--space-8);
    position: relative;
    z-index: 2;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-12);
    margin-bottom: var(--space-12);
}

.footer-brand {
    max-width: 360px;
}

.footer-brand .logo {
    margin-bottom: var(--space-4);
}

.footer-brand p {
    font-size: var(--fs-sm);
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-6);
    line-height: 1.7;
}

.footer-social {
    display: flex;
    gap: var(--space-3);
}

.social-link {
    width: 40px;
    height: 40px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

.social-link:hover {
    background: var(--gradient-primary);
    border-color: transparent;
    transform: translateY(-3px);
}

.social-link svg {
    width: 18px;
    height: 18px;
    color: var(--color-text-secondary);
    transition: color var(--transition-base);
}

.social-link:hover svg {
    color: var(--color-bg-primary);
}

.footer-col h4 {
    font-size: var(--fs-sm);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-5);
    color: var(--color-text-primary);
}

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

.footer-list a {
    color: var(--color-text-tertiary);
    font-size: var(--fs-sm);
    transition: color var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

.footer-list a:hover {
    color: var(--color-accent);
}

.footer-list a::before {
    content: '→';
    opacity: 0;
    transform: translateX(-8px);
    transition: all var(--transition-base);
}

.footer-list a:hover::before {
    opacity: 1;
    transform: translateX(0);
}

.footer-bottom {
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-border);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-4);
}

.footer-copyright {
    font-size: var(--fs-xs);
    color: var(--color-text-tertiary);
    font-family: var(--font-mono);
}

.footer-legal {
    display: flex;
    gap: var(--space-4);
}

.footer-legal a {
    font-size: var(--fs-xs);
    color: var(--color-text-tertiary);
    font-family: var(--font-mono);
}

.footer-legal a:hover {
    color: var(--color-accent);
}

/* ==========================================================================
   UTILITY CLASSES
   ========================================================================== */
.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

.text-mono { font-family: var(--font-mono); }
.text-center { text-align: center; }
.text-muted { color: var(--color-text-tertiary); }
.text-accent { color: var(--color-accent); }

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

.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }

/* Animations on scroll - used via JS */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.in-view {
    opacity: 1;
    transform: translateY(0);
}

.reveal-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.reveal-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.reveal-scale {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* Stagger children */
.stagger > * {
    transition-delay: calc(var(--i, 0) * 100ms);
}

/* Code/monospace elements */
.code-block {
    font-family: var(--font-mono);
    background: var(--color-bg-tertiary);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    font-size: var(--fs-sm);
    color: var(--color-accent);
    border: 1px solid var(--color-border);
}

/* Tags/Badges */
.tag {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-text-secondary);
}

.tag-accent {
    background: rgba(0, 212, 255, 0.1);
    border-color: rgba(0, 212, 255, 0.3);
    color: var(--color-accent);
}

.tag-purple {
    background: rgba(124, 58, 237, 0.1);
    border-color: rgba(124, 58, 237, 0.3);
    color: var(--color-accent-2);
}

/* Loading screen */
.preloader {
    position: fixed;
    inset: 0;
    background: var(--color-bg-primary);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.preloader.hidden {
    opacity: 0;
    visibility: hidden;
}

.preloader-content {
    text-align: center;
}

.preloader-logo {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-6);
    position: relative;
}

.preloader-spinner {
    position: absolute;
    inset: 0;
    border: 2px solid transparent;
    border-top-color: var(--color-accent);
    border-right-color: var(--color-accent-2);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.preloader-spinner::before {
    content: '';
    position: absolute;
    inset: 8px;
    border: 2px solid transparent;
    border-bottom-color: var(--color-accent);
    border-left-color: var(--color-accent-2);
    border-radius: 50%;
    animation: spin 1.5s linear infinite reverse;
}

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

.preloader-text {
    font-family: var(--font-mono);
    font-size: var(--fs-sm);
    color: var(--color-text-secondary);
    letter-spacing: 0.2em;
}

.preloader-text::after {
    content: '...';
    animation: dots 1.5s steps(4, end) infinite;
}

@keyframes dots {
    0%, 20% { content: ''; }
    40% { content: '.'; }
    60% { content: '..'; }
    80%, 100% { content: '...'; }
}