/* ============================================
   Antigravity — Design System v3.0
   Ultra-Premium Dark Theme
   Glassmorphism + Neon Glow + Soft 3D Depth
   ============================================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,300;0,14..32,400;0,14..32,500;0,14..32,600;0,14..32,700;0,14..32,800;0,14..32,900;1,14..32,400&family=Outfit:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ============================================
   1. Design Tokens
   ============================================ */
:root {
    /* Brand Palette — stays fixed across themes */
    --primary-50:#f0f0ff;--primary-100:#e0e0ff;--primary-200:#c5c3ff;
    --primary-300:#a8a4ff;--primary-400:#8B5CF6;--primary-500:#7C3AED;
    --primary-600:#6D28D9;--primary-700:#5B21B6;--primary-800:#4C1D95;

    --accent-400:#06B6D4;--accent-500:#0891B2;--accent-600:#0E7490;
    --pink-400:#EC4899;--pink-500:#DB2777;--pink-600:#BE185D;
    --violet-400:#8B5CF6;--violet-500:#7C3AED;--violet-600:#6D28D9;
    --neon-purple:#A855F7;--neon-blue:#3B82F6;--neon-cyan:#22D3EE;
    --neon-pink:#F472B6;--neon-green:#4ADE80;--neon-orange:#FB923C;

    --violet-400:#7C3AED;--violet-500:#6D28D9;
    --rose-400:#FB7185;--rose-500:#F43F5E;
    --success-400:#4ADE80;--success-500:#22C55E;--success-600:#16A34A;
    --warning-400:#FBBF24;--warning-500:#F59E0B;--warning-600:#D97706;
    --danger-400:#F87171;--danger-500:#EF4444;--danger-600:#DC2626;
    --info-400:#60A5FA;--info-500:#3B82F6;--info-600:#2563EB;

    --font-sans:'Inter','SF Pro Display',-apple-system,BlinkMacSystemFont,sans-serif;
    --font-display:'Outfit','Inter',sans-serif;
    --font-mono:'JetBrains Mono','Fira Code',monospace;

    --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;

    --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-12:2.5rem;--space-16:3rem;--space-20:4rem;--space-24:5rem;

    --radius-sm:6px;--radius-md:10px;--radius-lg:16px;--radius-xl:20px;--radius-2xl:28px;--radius-full:9999px;

    --transition-fast:150ms cubic-bezier(0.4,0,0.2,1);
    --transition-base:280ms cubic-bezier(0.4,0,0.2,1);
    --transition-slow:450ms cubic-bezier(0.4,0,0.2,1);
    --transition-spring:600ms cubic-bezier(0.34,1.56,0.64,1);
    --transition-bounce:500ms cubic-bezier(0.68,-0.55,0.265,1.55);

    --container-max:1280px;--container-wide:1440px;--nav-height:72px;--sidebar-width:280px;
}

/* ---- Dark Theme (Default) ---- */
[data-theme="dark"], :root {
    --bg-primary:#07071A;
    --bg-secondary:#0D0D2B;
    --bg-tertiary:#12122E;

    --surface-1:#141430;
    --surface-2:#1C1C40;
    --surface-3:#252558;
    --surface-4:#34347A;
    --surface-hover:#1C1C40;

    --glass-bg:rgba(20,20,48,0.75);
    --glass-border:rgba(139,92,246,0.12);
    --glass-blur:blur(20px) saturate(180%);
    --glass-shadow:0 8px 32px rgba(0,0,0,0.5);

    --text-primary:#F0EEFF;
    --text-secondary:#B8B0D8;
    --text-tertiary:#7B73A8;
    --text-muted:#4E4878;
    --text-link:#A78BFA;
    --text-link-hover:#C4B5FD;

    --border-subtle:rgba(139,92,246,0.08);
    --border-default:rgba(139,92,246,0.16);
    --border-strong:rgba(139,92,246,0.28);
    --border-primary:rgba(139,92,246,0.5);

    --shadow-sm:0 1px 3px rgba(0,0,0,0.4);
    --shadow-md:0 4px 12px rgba(0,0,0,0.5);
    --shadow-lg:0 10px 30px rgba(0,0,0,0.6);
    --shadow-xl:0 20px 50px rgba(0,0,0,0.7);
    --shadow-2xl:0 32px 72px rgba(0,0,0,0.8);
    --shadow-glow:0 0 30px rgba(139,92,246,0.25);
    --shadow-glow-cyan:0 0 30px rgba(34,211,238,0.2);
    --shadow-glow-pink:0 0 30px rgba(236,72,153,0.2);

    --primary-400:#A78BFA;
    --primary-500:#8B5CF6;
    --primary-600:#7C3AED;
    color-scheme: dark;
}

/* ---- Light Theme ---- */
[data-theme="light"] {
    --bg-primary:#F5F3FF;
    --bg-secondary:#EDE9FE;
    --bg-tertiary:#DDD6FE;

    --surface-1:#FFFFFF;
    --surface-2:#FAF8FF;
    --surface-3:#F3EEFF;
    --surface-4:#E9E0FF;
    --surface-hover:#F3EEFF;

    --glass-bg:rgba(255,255,255,0.85);
    --glass-border:rgba(139,92,246,0.12);
    --glass-blur:blur(20px) saturate(180%);
    --glass-shadow:0 8px 32px rgba(139,92,246,0.08);

    --text-primary:#1E1B4B;
    --text-secondary:#4C3B8B;
    --text-tertiary:#7C6BA8;
    --text-muted:#A898CC;
    --text-link:#7C3AED;
    --text-link-hover:#6D28D9;

    --border-subtle:rgba(139,92,246,0.08);
    --border-default:rgba(139,92,246,0.15);
    --border-strong:rgba(139,92,246,0.25);
    --border-primary:rgba(139,92,246,0.5);

    --shadow-sm:0 1px 3px rgba(139,92,246,0.06);
    --shadow-md:0 4px 12px rgba(139,92,246,0.1);
    --shadow-lg:0 10px 30px rgba(139,92,246,0.12);
    --shadow-xl:0 20px 50px rgba(139,92,246,0.15);
    --shadow-2xl:0 32px 72px rgba(139,92,246,0.2);
    --shadow-glow:0 0 30px rgba(139,92,246,0.15);
    --shadow-glow-cyan:0 0 30px rgba(34,211,238,0.1);
    --shadow-glow-pink:0 0 30px rgba(236,72,153,0.1);

    --primary-400:#7C3AED;
    --primary-500:#6D28D9;
    --primary-600:#5B21B6;
    color-scheme: light;
}

/* ============================================
   2. Reset & Base
   ============================================ */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}

body {
    font-family:var(--font-sans);
    font-size:var(--text-base);
    line-height:1.75;
    color:var(--text-secondary);
    background:var(--bg-primary);
    min-height:100vh;
    overflow-x:hidden;
    transition:background-color 0.4s ease,color 0.4s ease;
}

/* Animated mesh background */
body::before {
    content:'';
    position:fixed;
    inset:0;
    background:
        radial-gradient(ellipse 80% 60% at 10% 5%, rgba(139,92,246,0.18) 0%, transparent 55%),
        radial-gradient(ellipse 60% 50% at 90% 15%, rgba(34,211,238,0.12) 0%, transparent 50%),
        radial-gradient(ellipse 70% 60% at 50% 100%, rgba(236,72,153,0.1) 0%, transparent 55%),
        radial-gradient(ellipse 40% 40% at 80% 60%, rgba(168,85,247,0.08) 0%, transparent 50%);
    pointer-events:none;
    z-index:0;
    animation:bg-drift 25s ease-in-out infinite alternate;
}

body::after {
    content:'';
    position:fixed;
    inset:0;
    background-image:
        radial-gradient(circle at 1px 1px, rgba(139,92,246,0.04) 1px, transparent 0);
    background-size:40px 40px;
    pointer-events:none;
    z-index:0;
    opacity:0.6;
}

body>*{position:relative;z-index:1}

a{color:var(--text-link);text-decoration:none;transition:color var(--transition-fast)}
a:hover{color:var(--text-link-hover)}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
::selection{background:rgba(139,92,246,0.35);color:#fff}

::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:var(--bg-primary)}
::-webkit-scrollbar-thumb{background:linear-gradient(to bottom,var(--primary-400),var(--accent-400));border-radius:var(--radius-full)}
::-webkit-scrollbar-thumb:hover{background:var(--primary-400)}

/* ---- Theme Toggle ---- */
.theme-toggle {
    width:42px;height:42px;
    border-radius:var(--radius-lg);
    background:var(--glass-bg);
    backdrop-filter:var(--glass-blur);
    border:1px solid var(--glass-border);
    display:flex;align-items:center;justify-content:center;
    cursor:pointer;
    color:var(--text-tertiary);
    transition:all var(--transition-spring);
    padding:0;
}
.theme-toggle:hover {
    background:rgba(139,92,246,0.15);
    border-color:var(--border-primary);
    color:var(--primary-400);
    transform:translateY(-2px) rotate(15deg);
    box-shadow:var(--shadow-glow);
}
.theme-toggle svg{width:18px;height:18px}
[data-theme="light"] .sun-icon{display:none}
[data-theme="dark"] .moon-icon{display:none}

/* ---- Typography ---- */
h1,h2,h3,h4,h5,h6 {
    font-family:var(--font-display);
    color:var(--text-primary);
    font-weight:700;
    line-height:1.2;
    letter-spacing:-0.02em;
    transition:color 0.3s ease;
}
h1{font-size:var(--text-5xl)}
h2{font-size:var(--text-4xl)}
h3{font-size:var(--text-3xl)}
h4{font-size:var(--text-2xl)}
h5{font-size:var(--text-xl)}
h6{font-size:var(--text-lg)}
p{margin-bottom:var(--space-4);color:var(--text-secondary);transition:color 0.3s ease}

.text-gradient {
    background:linear-gradient(135deg, var(--neon-purple), var(--neon-cyan));
    -webkit-background-clip:text;-webkit-text-fill-color:transparent;
    background-clip:text;color:transparent;display:inline-block;
    filter:drop-shadow(0 0 20px rgba(168,85,247,0.4));
}
.text-gradient-violet {
    background:linear-gradient(135deg, var(--neon-pink), var(--neon-orange));
    -webkit-background-clip:text;-webkit-text-fill-color:transparent;
    background-clip:text;color:transparent;display:inline-block;
    filter:drop-shadow(0 0 20px rgba(244,114,182,0.4));
}
.section-title{text-align:center;margin-bottom:var(--space-4)}
.section-subtitle{text-align:center;max-width:600px;margin:0 auto var(--space-10);color:var(--text-tertiary);font-size:var(--text-lg)}

.label {
    display:inline-flex;align-items:center;gap:6px;
    font-size:var(--text-xs);
    font-weight:700;
    text-transform:uppercase;
    letter-spacing:0.15em;
    color:var(--primary-400);
    padding:4px 14px;
    background:rgba(139,92,246,0.08);
    border:1px solid rgba(139,92,246,0.2);
    border-radius:var(--radius-full);
    margin-bottom:var(--space-4);
}