:root {
    --primary-blue: #0066cc;
    --primary-purple: #6366f1;
    --primary-cyan: #06b6d4;
    --hero-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --card-gradient: linear-gradient(145deg, #f0f9ff 0%, #e0e7ff 100%);
    --dark-bg: #0f172a;
    --dark-surface: #1e293b;
    --dark-text: #f1f5f9;
}

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

body {
    font-family: 'Inter', 'Noto Sans SC', sans-serif;
    line-height: 1.6;
    color: #1f2937;
    overflow-x: hidden;
}

.hero-bg {
    background: var(--hero-gradient);
    position: relative;
    overflow: hidden;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(1deg); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.animate-fadeInUp {
    animation: fadeInUp 0.6s ease-out forwards;
}

.animate-slideInLeft {
    animation: slideInLeft 0.6s ease-out forwards;
}

.animate-pulse-slow {
    animation: pulse 3s ease-in-out infinite;
}

.card-hover {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.card-hover:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.glass-effect {
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.text-gradient {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-blur {
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.9);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.mobile-menu {
    transform: translateX(-100%);
    transition: transform 0.3s ease-in-out;
}

.mobile-menu.open {
    transform: translateX(0);
}

.typewriter {
    overflow: hidden;
    border-right: 2px solid #667eea;
    white-space: nowrap;
    animation: typing 3s steps(40, end), blink-caret 0.75s step-end infinite;
}

@keyframes typing {
    from { width: 0; }
    to { width: 100%; }
}

@keyframes blink-caret {
    from, to { border-color: transparent; }
    50% { border-color: #667eea; }
}

.particle {
    position: absolute;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    pointer-events: none;
    animation: particle-float 6s ease-in-out infinite;
}

@keyframes particle-float {
    0%, 100% { transform: translateY(0px) translateX(0px); opacity: 0.6; }
    50% { transform: translateY(-100px) translateX(50px); opacity: 1; }
}

.section-padding {
    padding: 5rem 0;
}

@media (max-width: 768px) {
    .section-padding {
        padding: 3rem 0;
    }
}

.code-block {
    background: #1e293b;
    color: #e2e8f0;
    border-radius: 0.5rem;
    padding: 1.5rem;
    font-family: 'JetBrains Mono', monospace;
    overflow-x: auto;
}

.language-switcher {
    position: relative;
    display: inline-flex;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 2rem;
    padding: 0.25rem;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.language-option {
    padding: 0.5rem 1rem;
    border-radius: 1.5rem;
    transition: all 0.3s ease;
    cursor: pointer;
    color: white;
    font-weight: 500;
    font-size: 0.875rem;
    min-width: 50px;
    text-align: center;
}

.language-option:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

.language-option.active {
    background: rgba(255, 255, 255, 0.9);
    color: #667eea;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.nav-language-switcher {
    background: #f3f4f6;
    border: 1px solid #e5e7eb;
    border-radius: 0.5rem;
    padding: 0.25rem;
    display: inline-flex;
}

.nav-language-option {
    padding: 0.375rem 0.75rem;
    border-radius: 0.375rem;
    transition: all 0.2s ease;
    cursor: pointer;
    color: #6b7280;
    font-weight: 500;
    font-size: 0.875rem;
}

.nav-language-option:hover {
    background: #e5e7eb;
    color: #374151;
}

.nav-language-option.active {
    background: #667eea;
    color: white;
}