@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-primary-light: #818cf8;
    
    --color-accent-cyan: #22d3ee;
    --color-accent-pink: #ec4899;
    --color-accent-violet: #a855f7;
    --color-accent-green: #22c55e;
    --color-accent-orange: #f97316;
    
    --color-ink: #f7f5f0;
    --color-body: #c9c0ad;
    --color-body-strong: #dad2c1;
    --color-body-muted: #aea69c;
    --color-mute: #8a8275;
    
    --color-canvas: #1a1510;
    --color-canvas-soft: #25201b;
    --color-canvas-parchment: #2d2620;
    --color-canvas-card: #2a241e;
    
    --color-hairline: #3a322a;
    --color-hairline-strong: #4a423a;
    --color-hairline-soft: #2f2a24;
    
    --color-link: #60a5fa;
    --color-link-hover: #93c5fd;
    
    --light-ink: #1a1510;
    --light-body: #4a423a;
    --light-body-strong: #2d2620;
    --light-body-muted: #6b645a;
    --light-mute: #8a8275;
    
    --light-canvas: #f7f5f0;
    --light-canvas-soft: #ebe9e4;
    --light-canvas-parchment: #e2dfd8;
    --light-canvas-card: #fff;
    
    --light-hairline: #d4d0c8;
    --light-hairline-strong: #c4c0b8;
    --light-hairline-soft: #e8e6e0;
    
    --light-link: #2563eb;
    --light-link-hover: #1d4ed8;
    
    --font-family-display: 'Inter', system-ui, -apple-system, sans-serif;
    --font-family-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace;
    
    --spacing-xxs: 4px;
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    --spacing-4xl: 96px;
    --spacing-5xl: 128px;
    
    --radius-xs: 4px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-display);
    background-color: var(--color-canvas);
    color: var(--color-ink);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

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

::-webkit-scrollbar-thumb:hover {
    background: var(--color-body-muted);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    min-height: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-3xl) 0;
    position: relative;
}

.section-title {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: -0.04em;
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-ink), var(--color-body));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--color-body);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    outline: none;
    font-family: var(--font-family-display);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent-cyan));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: var(--color-canvas-soft);
    color: var(--color-ink);
    border: 1px solid var(--color-hairline);
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    background-color: var(--color-canvas-parchment);
}

.btn-ghost {
    background-color: transparent;
    color: var(--color-body);
    padding: var(--spacing-xs) var(--spacing-lg);
}

.btn-ghost:hover {
    color: var(--color-ink);
    background-color: var(--color-canvas-soft);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 12px;
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: 16px;
}

.card {
    background-color: var(--color-canvas-card);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all var(--transition-normal);
}

.card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.mono {
    font-family: var(--font-family-mono);
    font-size: 13px;
    color: var(--color-accent-cyan);
}

.tag {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 500;
}

.tag-primary {
    background-color: rgba(99, 102, 241, 0.2);
    color: var(--color-primary-light);
}

.tag-cyan {
    background-color: rgba(34, 211, 238, 0.2);
    color: var(--color-accent-cyan);
}

.tag-dark {
    background-color: var(--color-canvas-soft);
    color: var(--color-body-muted);
}

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

.scale-in {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

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

@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(99, 102, 241, 0.3);
    }
    50% {
        box-shadow: 0 0 40px rgba(99, 102, 241, 0.6);
    }
}

@keyframes gradient-shift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-lg: 16px;
        --spacing-xl: 24px;
        --spacing-2xl: 32px;
        --spacing-3xl: 48px;
        --spacing-4xl: 64px;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
    }
    
    .section {
        padding: var(--spacing-3xl) 0;
    }
}

.theme-switcher {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px;
    background-color: var(--color-canvas-soft);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-switcher:hover {
    border-color: var(--color-primary);
}

.theme-dark,
.theme-light {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.theme-dark {
    background: linear-gradient(135deg, #1a1510 0%, #2d2620 100%);
    border: 2px solid var(--color-hairline);
}

.theme-light {
    background: linear-gradient(135deg, #f7f5f0 0%, #ebe9e4 100%);
    border: 2px solid transparent;
}

body.light-mode {
    --color-ink: var(--light-ink);
    --color-body: var(--light-body);
    --color-body-strong: var(--light-body-strong);
    --color-body-muted: var(--light-body-muted);
    --color-mute: var(--light-mute);
    
    --color-canvas: var(--light-canvas);
    --color-canvas-soft: var(--light-canvas-soft);
    --color-canvas-parchment: var(--light-canvas-parchment);
    --color-canvas-card: var(--light-canvas-card);
    
    --color-hairline: var(--light-hairline);
    --color-hairline-strong: var(--light-hairline-strong);
    --color-hairline-soft: var(--light-hairline-soft);
    
    --color-link: var(--light-link);
    --color-link-hover: var(--light-link-hover);
}

body.light-mode .theme-dark {
    border-color: transparent;
}

body.light-mode .theme-light {
    border-color: var(--light-hairline-strong);
}