:root {
    --bg-color: #ffffff;
    --text-color: #1d1d1f;
    --text-secondary: #6e6e73;
    --accent-color: #0071e3;
    --header-bg: rgba(255, 255, 255, 0.7);
    --footer-bg: #f5f5f7;
    --card-bg: #ffffff;
    --border-color: rgba(0, 0, 0, 0.1);
    --font-main: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-color: #000000;
    --text-color: #f5f5f7;
    --text-secondary: #a1a1a6;
    --accent-color: #2997ff;
    --header-bg: rgba(0, 0, 0, 0.7);
    --footer-bg: #1d1d1f;
    --card-bg: #1d1d1f;
    --border-color: rgba(255, 255, 255, 0.1);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    line-height: 1.5;
    overflow-x: hidden;
    transition: var(--transition);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.blur {
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
}

.navbar {
    height: 64px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 800;
    font-size: 1.5rem;
    display: flex;
    flex-direction: column;
    cursor: default;
}

.logo-zh {
    font-size: 1.2rem;
    line-height: 1;
}

.logo-en {
    font-size: 1.2rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-color);
}

.nav-controls {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.btn-icon {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.btn-icon:hover {
    background-color: var(--border-color);
}

.btn-icon svg {
    width: 20px;
    height: 20px;
}

.sun-icon {
    display: block;
}

[data-theme="dark"] .sun-icon {
    display: none;
}

.moon-icon {
    display: none;
}

[data-theme="dark"] .moon-icon {
    display: block;
}

.lang-text {
    font-weight: 600;
    font-size: 0.9rem;
    width: 24px;
    text-align: center;
}

/* Hero Section */
.hero-section {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-content {
    z-index: 10;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--text-color) 0%, var(--accent-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: clamp(1rem, 4vw, 1.5rem);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.visual-accent {
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--accent-color) 0%, transparent 70%);
    opacity: 0.15;
    filter: blur(60px);
    z-index: 1;
    pointer-events: none;
}

/* Footer */
.footer {
    padding: 4rem 0;
    background-color: var(--footer-bg);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.copyright {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.icp {
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
}

.icp a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.beian-icon {
    width: 16px;
    height: 16px;
}

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

.separator {
    margin: 0 0.5rem;
    color: var(--text-secondary);
    opacity: 0.5;
}

/* Animations */
.animate-up {
    animation: fadeInUp 1s ease-out forwards;
}

.animate-up-delayed {
    animation: fadeInUp 1s ease-out 0.3s forwards;
    opacity: 0;
}

.animate-pulse {
    animation: pulse 8s infinite alternate;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0% {
        transform: scale(1) translate(0, 0);
        opacity: 0.1;
    }

    100% {
        transform: scale(1.5) translate(10%, 10%);
        opacity: 0.2;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }
}