/* ===== 基础重置与变量 ===== */
:root {
    --color-bg: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-surface: #1a1a2e;
    --color-border: rgba(255, 255, 255, 0.06);
    --color-text: #e8e8ed;
    --color-text-secondary: #8a8a9a;
    --color-accent: #6366f1;
    --color-accent-light: #818cf8;
    --color-accent-glow: rgba(99, 102, 241, 0.15);
    --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 40px;
    backdrop-filter: blur(20px);
    background: rgba(10, 10, 15, 0.8);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition);
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 3px;
    background: linear-gradient(135deg, var(--color-accent-light), #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 36px;
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--color-text-secondary);
    letter-spacing: 0.5px;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-accent);
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--color-text);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 1px;
    transition: var(--transition);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    z-index: 999;
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    padding: 24px;
    flex-direction: column;
    gap: 20px;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    transition: var(--transition);
}

.mobile-menu.active {
    transform: translateY(0);
    opacity: 1;
}

.mobile-menu a {
    font-size: 1rem;
    color: var(--color-text-secondary);
    padding: 8px 0;
}

.mobile-menu a:hover {
    color: var(--color-text);
}

/* ===== 主视觉区 ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: float 12s ease-in-out infinite;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--color-accent), transparent 70%);
    top: -10%;
    right: -5%;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, #a78bfa, transparent 70%);
    bottom: -10%;
    left: -5%;
    animation-delay: -4s;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, #06b6d4, transparent 70%);
    top: 40%;
    left: 50%;
    animation-delay: -8s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.05); }
    66% { transform: translate(-20px, 20px) scale(0.95); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 0 24px;
}

.hero-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: var(--color-accent-light);
    margin-bottom: 24px;
    padding: 8px 20px;
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 100px;
    backdrop-filter: blur(10px);
    background: var(--color-accent-glow);
}

.hero-title {
    font-size: clamp(4rem, 12vw, 10rem);
    font-weight: 200;
    line-height: 1;
    letter-spacing: -2px;
    margin-bottom: 16px;
}

.title-line {
    display: inline-block;
}

.title-line.accent {
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-accent-light), #a78bfa, #06b6d4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title-dot {
    font-size: clamp(1.5rem, 4vw, 3rem);
    font-weight: 300;
    color: var(--color-text-secondary);
    vertical-align: super;
}

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    font-weight: 300;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
    letter-spacing: 2px;
}

.hero-domain {
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--color-text-secondary);
    letter-spacing: 3px;
    padding: 12px 28px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    display: inline-block;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.02);
}

.scroll-hint {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    margin-top: 60px;
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    letter-spacing: 1px;
    opacity: 0.6;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

/* ===== 关于区域 ===== */
.about {
    padding: 120px 0;
    background: var(--color-bg-secondary);
    position: relative;
}

.about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
    opacity: 0.3;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--color-accent-light);
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 300;
    letter-spacing: -0.5px;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.about-card {
    padding: 40px 32px;
    border-radius: 16px;
    border: 1px solid var(--color-border);
    background: rgba(255, 255, 255, 0.02);
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.about-card:hover {
    border-color: rgba(99, 102, 241, 0.3);
    background: var(--color-accent-glow);
    transform: translateY(-4px);
}

.card-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: var(--color-accent-glow);
    border: 1px solid rgba(99, 102, 241, 0.2);
    margin-bottom: 24px;
    color: var(--color-accent-light);
}

.about-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.about-card p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ===== 联系区域 ===== */
.contact {
    padding: 120px 0;
    text-align: center;
}

.contact-content {
    max-width: 500px;
    margin: 0 auto;
}

.contact-text {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.contact-domain {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 32px 48px;
    border-radius: 16px;
    border: 1px solid var(--color-border);
    background: rgba(255, 255, 255, 0.02);
    transition: var(--transition);
}

.contact-domain:hover {
    border-color: rgba(99, 102, 241, 0.3);
    background: var(--color-accent-glow);
}

.domain-label {
    font-size: 0.75rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--color-text-secondary);
}

.domain-link {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 2px;
    background: linear-gradient(135deg, var(--color-accent-light), #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== 页脚 ===== */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--color-border);
    background: var(--color-bg);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    text-align: center;
}

.footer-brand {
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 3px;
    color: var(--color-text-secondary);
}

.footer-info p {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    opacity: 0.7;
}

.footer-info .icp {
    margin-top: 8px;
}

.footer-info .icp a {
    color: var(--color-text-secondary);
    opacity: 0.7;
    transition: var(--transition);
}

.footer-info .icp a:hover {
    color: var(--color-accent-light);
    opacity: 1;
}

/* ===== 动画入场 ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .navbar {
        padding: 16px 20px;
    }

    .nav-links {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .mobile-menu {
        display: flex;
    }

    .hero-title {
        letter-spacing: -1px;
    }

    .about {
        padding: 80px 0;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .about-card {
        padding: 32px 24px;
    }

    .contact {
        padding: 80px 0;
    }

    .contact-domain {
        padding: 24px 32px;
    }

    .domain-link {
        font-size: 1.25rem;
    }

    .scroll-hint {
        margin-top: 40px;
    }
}

@media (max-width: 480px) {
    .hero-badge {
        font-size: 0.65rem;
        letter-spacing: 3px;
        padding: 6px 16px;
    }

    .hero-subtitle {
        font-size: 0.9rem;
        letter-spacing: 1px;
    }

    .hero-domain {
        font-size: 0.75rem;
        letter-spacing: 2px;
        padding: 10px 20px;
    }

    .section-header {
        margin-bottom: 48px;
    }
}