/* ========================================
   LorianStudio 洛林构想 - 主样式表
   暖金色 × 深色现代风格
   ======================================== */

/* ===== CSS 变量 ===== */
:root {
    /* 主题色系 */
    --primary: #D49B3E;
    --primary-light: #F0C060;
    --primary-dark: #B8860B;
    --accent: #E8724A;
    --accent-light: #F0986C;

    /* 功能色 */
    --success: #3FB950;
    --info: #58A6FF;
    --danger: #F85149;

    /* 字体 */
    --font-main: 'Microsoft YaHei', 'PingFang SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 30px rgba(212, 155, 62, 0.2);

    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* 布局 */
    --nav-height: 72px;
    --max-width: 1200px;
}

/* ===== 深色主题（默认） ===== */
[data-theme="dark"] {
    --bg-primary: #0F1419;
    --bg-secondary: #151B23;
    --bg-card: #1A1F2A;
    --bg-card-hover: #1F2632;
    --bg-elevated: #222832;
    --bg-overlay: rgba(15, 20, 25, 0.92);
    --text-primary: #E8ECF1;
    --text-secondary: #8B949E;
    --text-muted: #484F58;
    --border-color: rgba(255,255,255,0.08);
    --border-light: rgba(255,255,255,0.05);
    --nav-bg: rgba(15, 20, 25, 0.85);
    --nav-blur: blur(20px);
    --footer-bg: #0A0E13;
}

/* ===== 日间主题 ===== */
[data-theme="light"] {
    --bg-primary: #F5F2ED;
    --bg-secondary: #EDE8DF;
    --bg-card: #FFFFFF;
    --bg-card-hover: #F9F6F0;
    --bg-elevated: #FFFFFF;
    --bg-overlay: rgba(245, 242, 237, 0.92);
    --text-primary: #1A1D24;
    --text-secondary: #5C6370;
    --text-muted: #8E94A0;
    --border-color: rgba(0,0,0,0.08);
    --border-light: rgba(0,0,0,0.04);
    --nav-bg: rgba(245, 242, 237, 0.85);
    --nav-blur: blur(20px);
    --footer-bg: #EAE5DA;
}

/* ===== 全局重置 ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font-main);
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
    transition: background-color var(--transition-slow), color var(--transition-slow);
}

::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}
::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ===== 通用样式 ===== */
.section {
    padding: 100px 0;
    position: relative;
}

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

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 800;
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 12px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    margin: 16px auto 0;
    border-radius: 2px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 56px;
}

.text-gold {
    color: var(--primary);
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background: var(--nav-bg);
    backdrop-filter: var(--nav-blur);
    -webkit-backdrop-filter: var(--nav-blur);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

.nav-logo:hover {
    color: var(--primary);
}

.logo-icon svg {
    transition: transform var(--transition-normal);
}

.nav-logo:hover .logo-icon svg {
    transform: rotate(30deg);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--text-primary);
    background: var(--border-light);
}

.nav-link.active {
    color: var(--primary);
    background: rgba(212, 155, 62, 0.1);
}

/* 洛林方屿服务器外链 */
.nav-link-server {
    color: var(--accent) !important;
    border: 1px solid rgba(232, 114, 74, 0.3);
    margin-left: 8px;
}
.nav-link-server:hover {
    background: rgba(232, 114, 74, 0.15) !important;
    border-color: var(--accent);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* 主题切换按钮 */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.theme-toggle:hover {
    color: var(--primary);
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.theme-toggle svg {
    position: absolute;
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

[data-theme="dark"] .icon-sun {
    opacity: 1;
    transform: rotate(0);
}
[data-theme="dark"] .icon-moon {
    opacity: 0;
    transform: rotate(-90deg);
}
[data-theme="light"] .icon-sun {
    opacity: 0;
    transform: rotate(90deg);
}
[data-theme="light"] .icon-moon {
    opacity: 1;
    transform: rotate(0);
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-normal);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.hamburger.active span:nth-child(2) {
    opacity: 0;
}
.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 36px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    font-family: var(--font-main);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #FFF;
    box-shadow: 0 4px 16px rgba(212, 155, 62, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(212, 155, 62, 0.45);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: #FFF;
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(212, 155, 62, 0.3);
}

.btn-accent {
    background: var(--accent);
    color: #FFF;
    padding: 10px 24px;
    font-size: 0.9rem;
    border-radius: var(--radius-sm);
}

.btn-accent:hover {
    background: var(--accent-light);
    transform: translateY(-2px);
}

/* ===== 返回顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--primary);
    color: #FFF;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-normal);
    z-index: 999;
    box-shadow: 0 4px 16px rgba(212, 155, 62, 0.3);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(212, 155, 62, 0.5);
}

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

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

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }
.fade-in-delay-5 { transition-delay: 0.5s; }

.floating {
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

/* ===== Hero 首屏 ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: var(--nav-height) 24px 0;
}

.hero-bg-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(212, 155, 62, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(212, 155, 62, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 40%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 40%, transparent 70%);
}

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

.particle {
    position: absolute;
    background: var(--primary);
    border-radius: 50%;
    opacity: 0;
    animation: particleFade 4s ease-in-out infinite;
}

@keyframes particleFade {
    0%, 100% { opacity: 0; transform: translateY(0) scale(0); }
    10% { opacity: 0.4; }
    50% { opacity: 0.1; transform: translateY(-100px) scale(1.5); }
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 1;
    max-width: 700px;
}

.hero-logo {
    margin-bottom: 32px;
}

.hero-cube {
    filter: drop-shadow(0 0 30px rgba(212, 155, 62, 0.3));
}

.hero-title {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 20px;
}

.hero-title-cn {
    font-size: clamp(2rem, 6vw, 3.6rem);
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-light), var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 4px;
}

.hero-title-en {
    font-size: clamp(1rem, 2.5vw, 1.5rem);
    font-weight: 700;
    color: var(--text-secondary);
    letter-spacing: 6px;
    text-transform: uppercase;
}

.hero-subtitle {
    font-size: clamp(1rem, 2.2vw, 1.3rem);
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 16px;
    letter-spacing: 2px;
}

.hero-desc {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: 40px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-muted);
    animation: bounce 2s ease-in-out infinite;
    opacity: 0.6;
}

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

/* ===== 关于我们 ===== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.about-intro h3 {
    font-size: 1.6rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.about-intro p {
    color: var(--text-secondary);
    margin-bottom: 14px;
    line-height: 1.9;
}

.about-metrics {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.metric-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px 20px;
    text-align: center;
    transition: all var(--transition-normal);
}

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

.metric-icon {
    font-size: 2rem;
    margin-bottom: 12px;
    display: block;
}

.metric-value {
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 6px;
}

.metric-label {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* ===== 作品展示 ===== */
.portfolio-filter {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 8px 22px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-main);
}

.filter-btn:hover {
    color: var(--primary);
    border-color: var(--primary);
}

.filter-btn.active {
    background: var(--primary);
    color: #FFF;
    border-color: var(--primary);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.portfolio-item {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
    aspect-ratio: 4 / 3;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.portfolio-item:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.portfolio-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.portfolio-item:hover img {
    transform: scale(1.08);
}

.portfolio-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 24px 16px 16px;
    background: linear-gradient(transparent, rgba(15,20,25,0.9));
    transform: translateY(100%);
    transition: transform var(--transition-normal);
}

.portfolio-item:hover .portfolio-overlay {
    transform: translateY(0);
}

.portfolio-overlay h4 {
    font-size: 1.05rem;
    color: #FFF;
    margin-bottom: 4px;
}

.portfolio-overlay .portfolio-tag {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 10px;
    background: var(--primary);
    color: #FFF;
    font-size: 0.75rem;
}

/* ===== 团队优势 ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 36px 24px;
    text-align: center;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.feature-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transition: width var(--transition-normal);
    border-radius: 2px;
}

.feature-card:hover {
    transform: translateY(-6px);
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.feature-card:hover::after {
    width: 60%;
}

.feature-icon {
    font-size: 2.8rem;
    margin-bottom: 16px;
    display: block;
    transition: transform var(--transition-normal);
}

.feature-card:hover .feature-icon {
    transform: rotate(-8deg) scale(1.1);
}

.feature-card h4 {
    font-size: 1.15rem;
    color: var(--text-primary);
    margin-bottom: 10px;
}

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

/* ===== 代运营服务器卡片 ===== */
.server-card-wrapper {
    margin-top: 48px;
}

.server-card {
    display: block;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 36px 40px;
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.server-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.server-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.server-card:hover::before {
    opacity: 1;
}

.server-card-top {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 20px;
}

.server-icon {
    font-size: 2.8rem;
    flex-shrink: 0;
}

.server-info h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.server-tagline {
    font-size: 0.88rem;
    color: var(--accent);
    font-weight: 500;
}

.server-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.server-highlights {
    list-style: none;
    padding: 0;
    margin-bottom: 20px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.server-highlights li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    background: rgba(212, 155, 62, 0.08);
    border: 1px solid rgba(212, 155, 62, 0.15);
    border-radius: var(--radius-sm);
    padding: 6px 14px;
    transition: all var(--transition-fast);
}

.server-card:hover .server-highlights li {
    background: rgba(212, 155, 62, 0.12);
    border-color: rgba(212, 155, 62, 0.3);
}

.server-link-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 24px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    border-radius: var(--radius-sm);
    font-size: 0.92rem;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.server-card:hover .server-link-btn {
    box-shadow: 0 4px 16px rgba(212, 155, 62, 0.35);
    transform: translateY(-1px);
}

/* 响应式：服务器卡片 */
@media (max-width: 768px) {
    .server-card {
        padding: 28px 24px;
    }
    .server-card-top {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    .server-highlights {
        flex-direction: column;
    }
}

/* ===== 动态公告 ===== */
.news-timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: 40px;
}

.news-timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary), var(--accent));
    border-radius: 1px;
}

.news-item {
    position: relative;
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
    transition: all var(--transition-normal);
}

.news-item::before {
    content: '';
    position: absolute;
    left: -47px;
    top: 32px;
    width: 12px;
    height: 12px;
    background: var(--primary);
    border: 3px solid var(--bg-primary);
    border-radius: 50%;
}

.news-item:hover {
    transform: translateX(4px);
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.news-badge {
    display: inline-block;
    padding: 3px 12px;
    border-radius: 12px;
    font-size: 0.78rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.news-badge.event { background: rgba(212, 155, 62, 0.15); color: var(--primary); }
.news-badge.update { background: rgba(232, 114, 74, 0.15); color: var(--accent); }
.news-badge.announce { background: rgba(88, 166, 255, 0.15); color: var(--info); }

.news-date {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.news-item h4 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.news-item p {
    font-size: 0.92rem;
    color: var(--text-secondary);
}

/* ===== 加入我们 ===== */
.join-groups {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 64px;
}

.join-group-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px 20px;
    text-align: center;
    transition: all var(--transition-normal);
}

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

.join-group-icon {
    font-size: 2.6rem;
    display: block;
    margin-bottom: 12px;
}

.join-group-card h4 {
    font-size: 1.15rem;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.join-group-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.join-group-card .join-req {
    display: block;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.8;
}

.join-steps-title {
    text-align: center;
    font-size: 1.4rem;
    margin-bottom: 40px;
    color: var(--text-primary);
}

.join-steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    position: relative;
}

.join-step {
    text-align: center;
    position: relative;
    z-index: 1;
}

.join-step-num {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #FFF;
    font-size: 1.5rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    box-shadow: 0 4px 16px rgba(212, 155, 62, 0.3);
    transition: all var(--transition-normal);
}

.join-step:hover .join-step-num {
    transform: scale(1.1);
    box-shadow: 0 6px 24px rgba(212, 155, 62, 0.5);
}

.join-step h5 {
    font-size: 1.05rem;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.join-step p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.step-arrow {
    display: none;
}

/* ===== 联系我们 ===== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.contact-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 36px 24px;
    text-align: center;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    align-items: center;
}

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

.contact-card-icon {
    font-size: 2.6rem;
    margin-bottom: 14px;
    display: block;
}

.contact-card h4 {
    font-size: 1.15rem;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.contact-card p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.contact-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 28px;
    border-radius: var(--radius-sm);
    border: 2px solid var(--accent);
    color: var(--accent);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    font-family: var(--font-main);
    text-decoration: none;
    background: transparent;
}

.contact-btn:hover {
    background: var(--accent);
    color: #FFF;
    transform: translateY(-2px);
}

/* ===== 页脚 ===== */
.footer {
    background: var(--footer-bg);
    border-top: 1px solid var(--border-color);
    padding: 64px 0 0;
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 48px;
}

.footer-brand h3 {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin: 12px 0 8px;
}

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

.footer-links h4,
.footer-social h4 {
    font-size: 1.05rem;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.footer-links a {
    display: block;
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding: 5px 0;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-social-links {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.footer-social-links .contact-btn {
    padding: 8px 18px;
    font-size: 0.85rem;
}

.footer-bottom {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 24px;
    text-align: center;
    border-top: 1px solid var(--border-color);
    margin-top: 48px;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.82rem;
    line-height: 1.8;
}

.heart {
    color: var(--accent);
}

/* ===== 灯箱 ===== */
.lightbox {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.95);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.lightbox.active {
    opacity: 1;
    visibility: visible;
}

.lightbox-close {
    position: absolute;
    top: 24px;
    right: 32px;
    font-size: 2.5rem;
    color: var(--text-secondary);
    background: none;
    border: none;
    cursor: pointer;
    transition: color var(--transition-fast);
    z-index: 2001;
    line-height: 1;
}

.lightbox-close:hover {
    color: var(--primary);
}

.lightbox-prev,
.lightbox-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    z-index: 2001;
}

.lightbox-prev { left: 24px; }
.lightbox-next { right: 24px; }

.lightbox-prev:hover,
.lightbox-next:hover {
    color: var(--primary);
    border-color: var(--primary);
    background: var(--bg-elevated);
}

.lightbox-content {
    max-width: 85vw;
    max-height: 85vh;
    text-align: center;
    animation: zoomIn 0.3s ease;
}

@keyframes zoomIn {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}

.lightbox-content img {
    max-width: 100%;
    max-height: 75vh;
    object-fit: contain;
    border-radius: var(--radius-md);
    border: 2px solid var(--primary);
    box-shadow: 0 0 40px rgba(212, 155, 62, 0.2);
}

.lightbox-info {
    margin-top: 16px;
}

.lightbox-info h3 {
    color: #FFF;
    font-size: 1.3rem;
    margin-bottom: 4px;
}

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

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }

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

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

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

    .footer-container {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--bg-primary);
        flex-direction: column;
        padding: 100px 24px 40px;
        gap: 8px;
        transition: right var(--transition-normal);
        border-left: 1px solid var(--border-color);
        z-index: 999;
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-menu::before {
        content: '';
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.5);
        z-index: -1;
        opacity: 0;
        pointer-events: none;
    }

    .nav-menu.active::before {
        opacity: 1;
        pointer-events: all;
    }

    .nav-link {
        width: 100%;
        padding: 12px 16px;
    }

    .hamburger {
        display: flex;
    }

    .portfolio-grid {
        grid-template-columns: 1fr 1fr;
        gap: 14px;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
    }

    .features-grid {
        grid-template-columns: 1fr 1fr;
        gap: 16px;
    }

    .join-groups {
        grid-template-columns: 1fr 1fr;
        gap: 14px;
    }

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

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .hero-buttons .btn {
        width: 200px;
    }

    .section {
        padding: 72px 0;
    }

    .footer-container {
        grid-template-columns: 1fr;
        gap: 32px;
        text-align: center;
    }

    .footer-brand {
        align-items: center;
        display: flex;
        flex-direction: column;
    }

    .footer-social-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .portfolio-grid {
        grid-template-columns: 1fr;
    }

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

    .join-groups {
        grid-template-columns: 1fr;
    }

    .join-steps-grid {
        grid-template-columns: 1fr;
    }

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

    .portfolio-filter {
        gap: 6px;
    }

    .filter-btn {
        padding: 6px 14px;
        font-size: 0.8rem;
    }

    .news-timeline {
        padding-left: 28px;
    }

    .news-item::before {
        left: -35px;
        width: 10px;
        height: 10px;
    }

    .lightbox-prev,
    .lightbox-next {
        width: 40px;
        height: 40px;
    }

    .lightbox-prev { left: 10px; }
    .lightbox-next { right: 10px; }
}