/* ===== 基础重置 & 变量 ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-bg: #0a0a0f;
    --color-surface: #14141f;
    --color-surface-hover: #1c1c2a;
    --color-text: #e8e8ed;
    --color-text-dim: #8888a0;
    --color-accent: #7c5cfc;
    --color-accent-glow: rgba(124, 92, 252, 0.3);
    --color-border: rgba(255, 255, 255, 0.06);
    --radius: 16px;
    --radius-sm: 10px;
    --max-width: 1100px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.75);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition);
}

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

.logo {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-links a {
    color: var(--color-text-dim);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition);
}

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

/* 汉堡菜单 */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== Hero ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    padding: 120px 24px 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 50% 40%, var(--color-accent-glow), transparent),
        radial-gradient(ellipse 60% 50% at 80% 80%, rgba(124, 92, 252, 0.08), transparent);
    pointer-events: none;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero-title {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

.hero-date {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, #c4b5fd, #7c5cfc, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 3vw, 1.5rem);
    font-weight: 400;
    color: var(--color-text-dim);
}

.hero-desc {
    font-size: 1.05rem;
    color: var(--color-text-dim);
    margin-bottom: 40px;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-primary {
    background: var(--color-accent);
    color: #fff;
}

.btn-primary:hover {
    background: #6d4de0;
    transform: translateY(-2px);
    box-shadow: 0 8px 32px var(--color-accent-glow);
}

/* 滚动指示器 */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
}

.scroll-indicator span {
    display: block;
    width: 24px;
    height: 40px;
    border: 2px solid var(--color-text-dim);
    border-radius: 12px;
    position: relative;
}

.scroll-indicator span::after {
    content: '';
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--color-text-dim);
    border-radius: 2px;
    animation: scroll 2s ease-in-out infinite;
}

@keyframes scroll {
    0%, 100% { top: 6px; opacity: 1; }
    50% { top: 20px; opacity: 0.3; }
}

/* ===== Section 通用 ===== */
section {
    padding: 100px 24px;
}

.section-title {
    font-size: clamp(1.6rem, 4vw, 2.2rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 56px;
    letter-spacing: -0.02em;
}

/* ===== About ===== */
.about {
    background: var(--color-surface);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.about-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 36px 28px;
    text-align: center;
    transition: var(--transition);
}

.about-card:hover {
    border-color: rgba(124, 92, 252, 0.3);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(124, 92, 252, 0.08);
}

.about-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.about-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.about-card p {
    color: var(--color-text-dim);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ===== Gallery ===== */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 20px;
}

.gallery-item {
    aspect-ratio: 1;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: var(--transition);
    cursor: pointer;
}

.gallery-item:hover {
    border-color: rgba(124, 92, 252, 0.4);
    transform: scale(1.03);
    box-shadow: 0 8px 28px rgba(124, 92, 252, 0.1);
}

.gallery-placeholder {
    font-size: 2.2rem;
}

.gallery-item p {
    font-size: 0.8rem;
    color: var(--color-text-dim);
}

/* ===== Contact ===== */
.contact {
    background: var(--color-surface);
}

.contact-desc {
    text-align: center;
    color: var(--color-text-dim);
    margin-bottom: 36px;
}

.contact-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 16px;
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 24px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.contact-link:hover {
    border-color: var(--color-accent);
    background: var(--color-surface-hover);
    transform: translateY(-2px);
}

.contact-icon {
    font-size: 1.2rem;
}

/* ===== Footer ===== */
.footer {
    padding: 32px 24px;
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.footer p {
    color: var(--color-text-dim);
    font-size: 0.85rem;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(10, 10, 15, 0.95);
        backdrop-filter: blur(20px);
        padding: 20px 24px;
        gap: 16px;
        border-bottom: 1px solid var(--color-border);
    }

    .nav-links.active {
        display: flex;
    }

    .menu-toggle {
        display: flex;
    }

    section {
        padding: 72px 20px;
    }

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

    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ===== 滚动动画 ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

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