/* 
   UI/UX Pro Max Design System 
   Theme: Deep Space Intelligence
   Stack: Vanilla CSS + Variables
*/

:root {
    /* --- COLOR PALETTE --- */
    /* Primary Brand: Indigo/Violet */
    --primary-50: #eef2ff;
    --primary-100: #e0e7ff;
    --primary-200: #c7d2fe;
    --primary-300: #a5b4fc;
    --primary-400: #818cf8;
    --primary-500: #6366f1;
    /* Main Brand */
    --primary-600: #4f46e5;
    --primary-700: #4338ca;
    --primary-800: #3730a3;
    --primary-900: #312e81;
    --primary-950: #1e1b4b;

    /* Secondary Accent: Cyan/Teal (for tech vibes) */
    --accent-500: #06b6d4;
    --accent-glow: rgba(6, 182, 212, 0.4);

    /* Neutral / Dark Mode Base */
    --slate-50: #f8fafc;
    --slate-100: #f1f5f9;
    --slate-200: #e2e8f0;
    --slate-300: #cbd5e1;
    --slate-400: #94a3b8;
    --slate-500: #64748b;
    --slate-600: #475569;
    --slate-700: #334155;
    --slate-800: #1e293b;
    --slate-900: #0f172a;
    /* Main Background */
    --slate-950: #020617;
    /* Deep Background */

    /* Semantic Colors */
    --bg-body: var(--slate-950);
    --bg-surface: var(--slate-900);
    --bg-glass: rgba(15, 23, 42, 0.7);
    --bg-glass-heavy: rgba(2, 6, 23, 0.85);

    --text-main: var(--slate-50);
    --text-muted: var(--slate-400);
    --text-inverse: var(--slate-950);

    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-active: var(--primary-500);

    /* --- TYPOGRAPHY --- */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;

    --text-xs: 0.75rem;
    /* 12px */
    --text-sm: 0.875rem;
    /* 14px */
    --text-base: 1rem;
    /* 16px */
    --text-lg: 1.125rem;
    /* 18px */
    --text-xl: 1.25rem;
    /* 20px */
    --text-2xl: 1.5rem;
    /* 24px */
    --text-3xl: 1.875rem;
    /* 30px */
    --text-4xl: 2.25rem;
    /* 36px */
    --text-5xl: 3rem;
    /* 48px */
    --text-6xl: 3.75rem;
    /* 60px */

    /* --- SPACING & LAYOUT --- */
    --container-width: 1280px;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* --- EFFECTS --- */
    --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-glow: 0 0 20px rgba(99, 102, 241, 0.3);

    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- LIGHT THEME OVERRIDES --- */
[data-theme="light"] {
    --bg-body: var(--slate-50);
    --bg-surface: #ffffff;
    --bg-glass: rgba(255, 255, 255, 0.7);
    --bg-glass-heavy: rgba(255, 255, 255, 0.9);

    --text-main: var(--slate-900);
    --text-muted: var(--slate-600);
    --text-inverse: var(--slate-50);

    --border-subtle: rgba(0, 0, 0, 0.1);

    /* Adjust accent glow to be visible on light */
    --accent-glow: rgba(79, 70, 229, 0.15);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.15);

    /* Card adjustment for light mode */
    --card-bg-gradient: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-body);
    color: var(--text-main);
    font-family: var(--font-sans);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

img {
    max-width: 100%;
    display: block;
}

/* --- UTILITIES --- */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.text-gradient {
    background: linear-gradient(135deg, var(--primary-300) 0%, var(--primary-500) 50%, var(--accent-500) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-glass {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-subtle);
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.grid-cols-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

/* --- COMPONENTS --- */

/* Button System */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: var(--text-sm);
    letter-spacing: 0.025em;
    cursor: pointer;
    transition: var(--transition-base);
    text-decoration: none;
    border: 1px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-500) 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(79, 70, 229, 0.4);
    border-color: var(--primary-300);
}

.btn-outline {
    background: transparent;
    border-color: var(--slate-700);
    color: var(--text-main);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--slate-500);
}

/* Card System */
.card {
    background: var(--card-bg-gradient, linear-gradient(145deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0.01) 100%));
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.5);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    opacity: 0;
    transition: var(--transition-base);
}

.card:hover::before {
    opacity: 1;
}

/* Badge */
.badge {
    display: inline-flex;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-300);
    border: 1px solid rgba(99, 102, 241, 0.2);
    margin-bottom: 1rem;
}

/* --- SECTIONS --- */

/* Navbar */
.navbar {
    position: fixed;
    top: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: var(--container-width);
    z-index: 100;
    border-radius: var(--radius-full);
    padding: 0.75rem 2rem;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-weight: 800;
    font-size: 1.25rem;
    letter-spacing: -0.03em;
    color: white;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--text-muted);
    font-size: var(--text-sm);
    font-weight: 500;
}

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

/* Hero */
.hero {
    min-height: 100vh;
    padding-top: 8rem;
    position: relative;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    z-index: -1;
    background:
        radial-gradient(circle at 15% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 85% 30%, rgba(6, 182, 212, 0.1) 0%, transparent 50%);
    filter: blur(60px);
}

/* Bento Grid Services */
.bento-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-gap: 1.5rem;
    grid-auto-rows: minmax(280px, auto);
}

.bento-item-lg {
    grid-column: span 2;
}

.bento-item {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

/* Footer */
footer {
    border-top: 1px solid var(--border-subtle);
    padding: 4rem 0;
    margin-top: 8rem;
    background: var(--slate-950);
}

/* --- ANIMATIONS --- */
/* --- ANIMATIONS --- */
.fade-up {
    opacity: 1;
    /* VISIBLE BY DEFAULT */
    transform: translateY(0);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

/* Only hide if JS is working - we will add 'js-loading' class in HTML if needed, 
   but for now let's just keep it visible to play safe against "not looking right" */
.fade-up.hidden-initial {
    opacity: 0;
    transform: translateY(30px);
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 1024px) {
    .bento-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .bento-item-lg {
        grid-column: span 2;
    }
}

@media (max-width: 768px) {
    .navbar {
        width: 100%;
        top: 0;
        border-radius: 0;
        padding: 1rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .grid-cols-3,
    .bento-grid {
        grid-template-columns: 1fr;
    }

    .bento-item-lg {
        grid-column: span 1;
    }

    .nav-links {
        display: flex;
        flex-direction: column;
        gap: 1rem;
        background: var(--slate-900);
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        padding: 1.5rem;
        border-bottom: 1px solid var(--border-subtle);
    }
}