/* ========================================
   成电开放原子开源社团 - GitHub Dark Theme
   颜色参考 GitHub 深色模式
   ======================================== */

/* ========== CSS 变量定义 ========== */
:root {
    /* GitHub 深色主题主色 */
    --bg-primary: #0d1117;      /* 主背景 */
    --bg-secondary: #161b22;    /* 次背景 */
    --bg-tertiary: #21262d;     /* 第三层背景 */
    --bg-hover: #30363d;        /* 悬停背景 */

    /* 文字颜色 */
    --text-primary: #f0f6fc;    /* 主文字 */
    --text-secondary: #c9d1d9;  /* 次文字 */
    --text-muted: #8b949e;      /* 弱化文字 */

    /* 边框 */
    --border-primary: #30363d;
    --border-secondary: #21262d;

    /* 强调色 */
    --accent-green: #238636;    /* GitHub 绿色按钮 */
    --accent-green-hover: #2ea043;
    --accent-blue: #58a6ff;     /* 链接蓝 */
    --accent-blue-hover: #79c0ff;
    --accent-purple: #a371f7;
    --accent-orange: #f0883e;

    /* 悬停边框色（修复 feature-card hover 未定义问题） */
    --border-hover: #58a6ff;

    /* 布局 */
    --sidebar-width: 280px;
    --navbar-height: 64px;
    --content-max-width: 1280px;

    /* 动画曲线 */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ========== 基础重置 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

a {
    color: var(--accent-blue);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--accent-blue-hover);
    text-decoration: underline;
}

/* ========================================
   🎬 全局动画系统
   ======================================== */

/* 页面整体淡入（防止白屏闪烁） */
@keyframes pageFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
body {
    animation: pageFadeIn 0.4s ease-out;
}

/* 元素入场动画 - 从下方滑入 */
@keyframes slideUp {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
}
.animate-slide-up {
    animation: slideUp 0.5s var(--ease-out-expo) both;
}
.delay-1 { animation-delay: 0.05s; }
.delay-2 { animation-delay: 0.10s; }
.delay-3 { animation-delay: 0.15s; }
.delay-4 { animation-delay: 0.20s; }
.delay-5 { animation-delay: 0.25s; }
.delay-6 { animation-delay: 0.30s; }

/* 元素入场动画 - 从左侧滑入 */
@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-24px); }
    to { opacity: 1; transform: translateX(0); }
}
.animate-slide-left {
    animation: slideInLeft 0.5s var(--ease-out-expo) both;
}

/* 元素入场动画 - 缩放弹入 */
@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.92); }
    to { opacity: 1; transform: scale(1); }
}
.animate-scale-in {
    animation: scaleIn 0.5s var(--ease-out-back) both;
}

/* 脉冲发光（用于状态指示器） */
@keyframes pulseGlow {
    0%, 100% { box-shadow: 0 0 0 0 rgba(35,134,54,0.4); }
    50% { box-shadow: 0 0 12px 4px rgba(35,134,54,0.15); }
}
.pulse-glow {
    animation: pulseGlow 2s infinite;
}

/* 浮动动画（用于装饰元素） */
@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-8px); }
}
.animate-float {
    animation: float 3s ease-in-out infinite;
}

/* 渐变背景流动 */
@keyframes gradientFlow {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* 打字机光标闪烁 */
@keyframes blinkCursor {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* 数字滚动计数器 */
@keyframes countUp {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 加载骨架屏闪烁 */
@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}
.skeleton {
    background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-hover) 50%, var(--bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 6px;
}

/* ========================================
   Logo 样式
   ======================================== */
.nav-logo-img {
    height: 38px;
    width: auto;
    object-fit: contain;
    border-radius: 8px;
    transition: all 0.3s var(--ease-out-expo);
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
}
.nav-logo-img:hover {
    transform: scale(1.08) rotate(-2deg);
    filter: drop-shadow(0 4px 8px rgba(88,166,255,0.3));
}

/* Hero 区域大 Logo */
.hero-logo {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 20px;
    border: 3px solid rgba(88,166,255,0.3);
    transition: all 0.5s var(--ease-out-expo);
    animation: scaleIn 0.8s var(--ease-out-back) 0.2s both;
}
.hero-logo:hover {
    transform: scale(1.08);
    border-color: rgba(88,166,255,0.6);
    box-shadow: 0 0 32px rgba(88,166,255,0.15);
}

/* 页脚 Logo */
.footer-logo {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: contain;
    vertical-align: middle;
    margin-right: 8px;
}

/* ========================================
   顶部导航栏
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background-color: rgba(22, 27, 34, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-primary);
    z-index: 1000;
    transition: all 0.3s var(--ease-out-expo);
}
/* 滚动后导航栏变紧凑 */
.navbar.scrolled {
    background-color: rgba(13, 17, 23, 0.95);
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.nav-container {
    max-width: var(--content-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-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-logo:hover {
    text-decoration: none;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
}

.nav-link {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: 8px;
    transition: all 0.25s var(--ease-out-expo);
    position: relative;
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-blue);
    border-radius: 1px;
    transition: all 0.25s var(--ease-out-expo);
    transform: translateX(-50%);
}
.nav-link:hover::after,
.nav-link.active::after {
    width: calc(100% - 28px);
}
.nav-link:hover {
    color: var(--text-primary);
    background-color: var(--bg-hover);
    text-decoration: none;
}
.nav-link.active {
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
}

.nav-btn {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 6px 16px;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid var(--border-primary);
    transition: all 0.25s var(--ease-out-expo);
}
.nav-btn:hover {
    background-color: var(--accent-green);
    border-color: var(--accent-green);
    text-decoration: none;
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(35,134,54,0.3);
}

/* ========================================
   主体布局
   ======================================== */
.main-layout {
    display: flex;
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: calc(var(--navbar-height) + 24px) 24px 24px;
    gap: 24px;
}

/* ========================================
   左侧边栏
   ======================================== */
.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    position: sticky;
    top: calc(var(--navbar-height) + 24px);
    height: fit-content;
}

.sidebar-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    transition: all 0.3s var(--ease-out-expo);
}
.sidebar-card:hover {
    border-color: rgba(88,166,255,0.2);
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.sidebar-card h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-secondary);
}

.sidebar-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.quick-links {
    list-style: none;
}

.quick-links li {
    margin-bottom: 4px;
}

.quick-links a {
    display: block;
    padding: 10px 12px;
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 0.875rem;
    transition: all 0.2s var(--ease-out-expo);
    position: relative;
    overflow: hidden;
}
.quick-links a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 3px;
    background: var(--accent-blue);
    border-radius: 0 2px 2px 0;
    transform: scaleY(0);
    transition: transform 0.2s var(--ease-out-expo);
}
.quick-links a:hover::before {
    transform: scaleY(1);
}
.quick-links a:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    text-decoration: none;
    padding-left: 18px;
}

.stats-card .stat-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-secondary);
    transition: all 0.2s;
}
.stats-card .stat-item:hover {
    padding-left: 8px;
}
.stats-card .stat-item:last-child {
    border-bottom: none;
}

.stat-number {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-blue);
    transition: color 0.2s;
}
.stats-card .stat-item:hover .stat-number {
    color: var(--accent-green);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ========================================
   右侧主内容区
   ======================================== */
.content {
    flex: 1;
    min-width: 0;
}

/* ========================================
   Hero 区域
   ======================================== */
.hero {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 50%, rgba(35,134,54,0.06) 100%);
    background-size: 200% 200%;
    animation: gradientFlow 8s ease infinite;
    border: 1px solid var(--border-primary);
    border-radius: 16px;
    padding: 48px;
    text-align: center;
    margin-bottom: 32px;
    position: relative;
    overflow: hidden;
}
/* Hero 装饰性背景粒子 */
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -30%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(88,166,255,0.08) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    animation: float 6s ease-in-out infinite;
}
.hero::after {
    content: '';
    position: absolute;
    bottom: -40%;
    left: -20%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(35,134,54,0.06) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    animation: float 5s ease-in-out infinite reverse;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    position: relative;
    z-index: 1;
}

.hero-icon {
    font-size: 3.5rem;
    display: inline-block;
    transition: transform 0.3s var(--ease-out-back);
}
.hero-icon:hover {
    transform: scale(1.2) rotate(10deg);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--accent-blue);
    font-weight: 500;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}

.hero-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 32px;
    position: relative;
    z-index: 1;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

/* ========================================
   按钮样式（增强版）
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    transition: all 0.25s var(--ease-out-expo);
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}
.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255,255,255,0.15);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.4s, height 0.4s;
}
.btn:active::after {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background-color: var(--accent-green);
    color: white;
}
.btn-primary:hover {
    background-color: var(--accent-green-hover);
    text-decoration: none;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(35,134,54,0.35);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-primary);
}
.btn-secondary:hover {
    background-color: var(--bg-hover);
    text-decoration: none;
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

/* ========================================
   区域标题
   ======================================== */
.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-primary);
    position: relative;
}
.section-title::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 60px;
    height: 2px;
    background: var(--accent-green);
    border-radius: 1px;
}

/* ========================================
   特色卡片网格（增强动画）
   ======================================== */
.features {
    margin-bottom: 48px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.feature-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 12px;
    padding: 24px;
    transition: all 0.35s var(--ease-out-expo);
    position: relative;
    overflow: hidden;
}
/* 卡片顶部装饰线 */
.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-green), var(--accent-blue), var(--accent-purple));
    opacity: 0;
    transition: opacity 0.3s;
}
.feature-card:hover::before {
    opacity: 1;
}
.feature-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-6px);
    box-shadow: 0 12px 32px rgba(0,0,0,0.25);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
    display: inline-block;
    transition: transform 0.3s var(--ease-out-back);
}
.feature-card:hover .feature-icon {
    transform: scale(1.15) rotate(-5deg);
}

.feature-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========================================
   时间线（增强动画）
   ======================================== */
.updates {
    margin-bottom: 48px;
}

.timeline {
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent-green), var(--accent-blue), transparent);
}

.timeline-item {
    display: flex;
    gap: 20px;
    padding: 20px 0;
    position: relative;
    transition: all 0.3s;
}
.timeline-item:hover {
    transform: translateX(4px);
}
.timeline-item:hover .timeline-dot {
    box-shadow: 0 0 0 4px rgba(35,134,54,0.2);
}

.timeline-dot {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background-color: var(--accent-green);
    border: 3px solid var(--bg-primary);
    flex-shrink: 0;
    position: relative;
    z-index: 1;
    transition: all 0.3s var(--ease-out-expo);
}

.timeline-content {
    flex: 1;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s var(--ease-out-expo);
}
.timeline-item:hover .timeline-content {
    border-color: rgba(88,166,255,0.3);
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.timeline-date {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.timeline-content h4 {
    font-size: 1rem;
    font-weight: 600;
    margin: 8px 0;
    color: var(--text-primary);
}

.timeline-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ========================================
   联系方式
   ======================================== */
.contact {
    margin-bottom: 48px;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.contact-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    transition: all 0.3s var(--ease-out-expo);
}
.contact-card:hover {
    transform: translateY(-4px) scale(1.02);
    border-color: var(--accent-blue);
    box-shadow: 0 8px 24px rgba(88,166,255,0.12);
}

.contact-card h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.contact-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ========================================
   页脚（增强）
   ======================================== */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-primary);
    padding: 40px 24px;
    margin-top: 48px;
    position: relative;
    overflow: hidden;
}
/* 页脚顶部渐变线 */
.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-blue), var(--accent-green), transparent);
}

.footer-content {
    max-width: var(--content-max-width);
    margin: 0 auto;
    text-align: center;
}

.footer-content p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.footer-content a {
    color: var(--text-secondary);
    transition: color 0.2s;
}
.footer-content a:hover {
    color: var(--accent-blue);
}

/* ========================================
   成员页面样式（增强动画）
   ======================================== */
.members-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.member-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 12px;
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: all 0.35s var(--ease-out-expo);
    position: relative;
    overflow: hidden;
}
.member-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--accent-blue), var(--accent-purple));
    opacity: 0;
    transition: opacity 0.3s;
}
.member-card:hover::after {
    opacity: 1;
}
.member-card:hover {
    border-color: var(--accent-blue);
    transform: translateX(4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}

.member-avatar {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    flex-shrink: 0;
    transition: transform 0.3s var(--ease-out-back);
}
.member-card:hover .member-avatar {
    transform: scale(1.1) rotate(5deg);
}

.member-info h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.member-role {
    font-size: 0.875rem;
    color: var(--accent-green);
    font-weight: 500;
    margin-bottom: 4px;
}

.member-bio {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

/* ========================================
   项目页面样式（增强动画）
   ======================================== */
.projects-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.project-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 12px;
    padding: 24px;
    transition: all 0.35s var(--ease-out-expo);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}
.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-green), var(--accent-blue));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.35s var(--ease-out-expo);
}
.project-card:hover::before {
    transform: scaleX(1);
}
.project-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(0,0,0,0.2);
}

.project-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 12px;
}

.project-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-blue);
    transition: color 0.2s;
}
.project-card:hover .project-title {
    color: var(--accent-blue-hover);
}

.project-stats {
    display: flex;
    gap: 16px;
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.project-stat {
    display: flex;
    align-items: center;
    gap: 4px;
    transition: color 0.2s;
}
.project-card:hover .project-stat {
    color: var(--text-secondary);
}

.project-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.project-tag {
    background-color: var(--bg-tertiary);
    color: var(--accent-blue);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    transition: all 0.2s;
}
.project-tag:hover {
    background-color: rgba(88,166,255,0.15);
}

/* 项目进度条动画 */
.project-progress-mini {
    flex: 1;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
}
.project-progress-fill-mini {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-green), #3fb950);
    border-radius: 3px;
    transition: width 1s var(--ease-out-expo);
}

/* 状态徽章 */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}
.status-badge.active {
    background: rgba(63,185,80,0.15);
    color: #3fb950;
}
.status-badge.planning {
    background: rgba(240,136,62,0.15);
    color: var(--accent-orange);
}

/* ========================================
   文档页面样式
   ======================================== */
.doc-content {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 12px;
    padding: 32px;
}

.doc-content h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-primary);
}

.doc-content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 32px 0 16px;
    color: var(--text-primary);
}

.doc-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 24px 0 12px;
    color: var(--text-primary);
}

.doc-content p {
    margin-bottom: 16px;
    color: var(--text-secondary);
}

.doc-content ul,
.doc-content ol {
    margin-bottom: 16px;
    padding-left: 24px;
}

.doc-content li {
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.doc-content code {
    background-color: var(--bg-tertiary);
    padding: 2px 8px;
    border-radius: 4px;
    font-family: 'SF Mono', Monaco, monospace;
    font-size: 0.875rem;
    color: var(--accent-orange);
}

.doc-content pre {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    padding: 16px;
    overflow-x: auto;
    margin-bottom: 16px;
}

.doc-content pre code {
    background: none;
    padding: 0;
    color: var(--text-secondary);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
    .main-layout {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        position: static;
        order: 2;
    }

    .content {
        order: 1;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-icon {
        font-size: 2.5rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero {
        padding: 32px 24px;
    }

    .hero-title {
        font-size: 1.5rem;
        flex-direction: column;
        gap: 8px;
    }

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

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

/* ========================================
   亮色主题（GitHub Light）
   配合 body.light 类切换
   ======================================== */
body.light {
    --bg-primary: #ffffff;
    --bg-secondary: #f6f8fa;
    --bg-tertiary: #eaeef2;
    --bg-hover: #d0d7de;
    --text-primary: #1f2328;
    --text-secondary: #656d76;
    --text-muted: #8b949e;
    --border-primary: #d0d7de;
    --border-secondary: #eaeef2;
    --accent-green: #1a7f37;
    --accent-green-hover: #2da44e;
    --accent-blue: #0969da;
    --accent-blue-hover: #0550ae;
    --accent-purple: #8250df;
    --accent-orange: #bc4c00;
    --border-hover: #0969da;
}

/* ========================================
   亮色模式 - 导航栏适配
   修复：亮色模式下导航栏仍为深色背景的问题
   ======================================== */
body.light .navbar {
    background-color: rgba(255, 255, 255, 0.85);
    border-bottom-color: var(--border-primary);
}
body.light .navbar.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

/* ========================================
   主题切换按钮（增强）
   ======================================== */
.theme-toggle {
    background: none;
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    padding: 6px 10px;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-secondary);
    transition: all 0.3s var(--ease-out-expo);
    display: flex;
    align-items: center;
    justify-content: center;
}
.theme-toggle:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    transform: rotate(15deg);
}

/* ========================================
   回到顶部按钮（增强动画）
   ======================================== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.35s var(--ease-out-expo);
    z-index: 999;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}
.back-to-top:hover {
    background: var(--accent-green);
    border-color: var(--accent-green);
    transform: translateY(-4px) scale(1.1);
    box-shadow: 0 8px 24px rgba(35,134,54,0.4);
}

/* ========================================
   全站搜索弹窗 Ctrl+K（增强动画）
   ======================================== */
.search-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 15vh;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.25s var(--ease-out-expo);
}
.search-overlay.active {
    opacity: 1;
    visibility: visible;
}
.search-modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 14px;
    width: 560px;
    max-width: 90vw;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
    transform: scale(0.96) translateY(-10px);
    transition: all 0.3s var(--ease-out-back);
}
.search-overlay.active .search-modal {
    transform: scale(1) translateY(0);
}
.search-modal-input {
    width: 100%;
    padding: 16px 20px;
    border: none;
    border-bottom: 1px solid var(--border-primary);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}
.search-modal-input:focus {
    border-bottom-color: var(--accent-blue);
}
.search-modal-input::placeholder {
    color: var(--text-muted);
}
.search-results {
    max-height: 360px;
    overflow-y: auto;
}
.search-result-item {
    padding: 12px 20px;
    cursor: pointer;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    gap: 12px;
    border-left: 3px solid transparent;
}
.search-result-item:hover,
.search-result-item.selected {
    background: var(--bg-tertiary);
    border-left-color: var(--accent-blue);
}
.search-result-icon {
    font-size: 1.2rem;
    flex-shrink: 0;
    transition: transform 0.2s;
}
.search-result-item:hover .search-result-icon {
    transform: scale(1.2);
}
.search-result-info h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}
.search-result-info p {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 2px;
}
.search-empty {
    padding: 32px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}
.search-modal-footer {
    padding: 10px 20px;
    border-top: 1px solid var(--border-primary);
    display: flex;
    gap: 16px;
    font-size: 0.75rem;
    color: var(--text-muted);
}
.search-modal-footer kbd {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: 4px;
    padding: 1px 6px;
    font-family: monospace;
    font-size: 0.7rem;
}

/* ========================================
   博客卡片样式（增强动画）
   ======================================== */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 20px;
}

.blog-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.35s var(--ease-out-expo);
    cursor: pointer;
}
.blog-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 36px rgba(0,0,0,0.25);
    border-color: var(--accent-blue);
}

.blog-card-cover {
    font-size: 3rem;
    text-align: center;
    padding: 28px 20px 16px;
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
    transition: transform 0.4s var(--ease-out-expo);
}
.blog-card:hover .blog-card-cover {
    transform: scale(1.03);
}

.blog-card-body {
    padding: 16px 20px 20px;
}

.blog-card-meta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 10px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.blog-card-title {
    font-size: 1rem;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 8px;
    color: var(--text-primary);
    transition: color 0.2s;
}
.blog-card:hover .blog-card-title {
    color: var(--accent-blue);
}

.blog-card-excerpt {
    font-size: 0.8125rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 12px;
    border-top: 1px solid var(--border-secondary);
}

.blog-card-author {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.blog-read-btn {
    font-size: 0.78rem !important;
    padding: 4px 14px !important;
}

/* 分类筛选栏 */
.filter-bar {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.filter-btn {
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-primary);
    cursor: pointer;
    transition: all 0.2s var(--ease-out-expo);
}
.filter-btn:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}
.filter-btn.active {
    background: var(--accent-green);
    color: white;
    border-color: var(--accent-green);
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 24px;
}
.page-btn {
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 500;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-primary);
    cursor: pointer;
    transition: all 0.2s;
}
.page-btn:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}
.page-btn.active {
    background: var(--accent-green);
    color: white;
    border-color: var(--accent-green);
}

/* ========================================
   资源页面专用样式（增强动画）
   ======================================== */
.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 48px;
}
.resource-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 12px;
    padding: 24px;
    transition: all 0.35s var(--ease-out-expo);
    position: relative;
    overflow: hidden;
}
.resource-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
    opacity: 0;
    transition: opacity 0.3s;
}
.resource-card:hover::before {
    opacity: 1;
}
.resource-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}
.resource-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}
.resource-icon {
    font-size: 2rem;
    transition: transform 0.3s var(--ease-out-back);
}
.resource-card:hover .resource-icon {
    transform: scale(1.15) rotate(-5deg);
}
.resource-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}
.resource-list {
    list-style: none;
}
.resource-list li {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-secondary);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: padding-left 0.2s;
}
.resource-list li:hover {
    padding-left: 8px;
}
.resource-list li:last-child {
    border-bottom: none;
}
.resource-list a {
    color: var(--accent-blue);
    font-size: 0.875rem;
}
.resource-list a:hover {
    text-decoration: underline;
}
.book-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-secondary);
    transition: background 0.2s;
}
.book-item:hover {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding-left: 8px;
    padding-right: 8px;
}
.book-item:last-child {
    border-bottom: none;
}
.book-cover {
    width: 48px;
    height: 64px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
    transition: transform 0.3s var(--ease-out-back);
}
.book-item:hover .book-cover {
    transform: scale(1.1) rotate(3deg);
}
.book-info h4 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 4px;
}
.book-info p {
    font-size: 0.75rem;
    color: var(--text-muted);
}
.book-badge {
    display: inline-block;
    padding: 2px 8px;
    background: rgba(35,134,54,0.15);
    border: 1px solid rgba(35,134,54,0.3);
    border-radius: 100px;
    font-size: 0.7rem;
    color: #3fb950;
    margin-top: 4px;
}

/* ========================================
   Tag 标签通用样式
   ======================================== */
.tag {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.72rem;
    font-weight: 600;
    background: rgba(88,166,255,0.1);
    color: var(--accent-blue);
    border: 1px solid rgba(88,166,255,0.15);
    transition: all 0.2s;
}
.tag:hover {
    background: rgba(88,166,255,0.2);
    transform: scale(1.05);
}

/* ========================================
   滚动条美化
   ======================================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--border-primary);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ========================================
   选中文字样式
   ======================================== */
::selection {
    background: rgba(88,166,255,0.3);
    color: var(--text-primary);
}

/* ========================================
   Focus 可见性（无障碍）
   ======================================== */
*:focus-visible {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

/* ========================================
   图片懒加载过渡
   ======================================== */
img[loading="lazy"] {
    opacity: 0;
    transition: opacity 0.4s;
}
img[loading="lazy"].loaded {
    opacity: 1;
}

/* ========================================
   🔐 登录弹窗样式
   ======================================== */

/* 弹窗遮罩层 */
.login-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

/* 弹窗容器 */
.login-modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    z-index: 2001;
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 16px;
    width: 420px;
    max-width: 90vw;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s var(--ease-out-expo);
}

/* 弹窗显示状态 */
.login-overlay.active,
.login-modal.active {
    opacity: 1;
    visibility: visible;
}
.login-modal.active {
    transform: translate(-50%, -50%) scale(1);
}

/* 弹窗头部 */
.login-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-primary);
}

.login-modal-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.login-close-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--bg-tertiary);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}
.login-close-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    transform: rotate(90deg);
}

/* Tab 切换（登录/注册） */
.login-tabs {
    display: flex;
    padding: 16px 24px;
    gap: 8px;
    border-bottom: 1px solid var(--border-primary);
}

.login-tab {
    flex: 1;
    padding: 10px 16px;
    border: 1px solid var(--border-primary);
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}
.login-tab:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}
.login-tab.active {
    background: var(--accent-green);
    border-color: var(--accent-green);
    color: white;
}

/* 表单内容区 */
.login-form-container {
    padding: 24px;
}

.login-form {
    display: none;
}
.login-form.active {
    display: block;
    animation: slideUp 0.3s var(--ease-out-expo);
}

/* 表单输入组 */
.login-input-group {
    margin-bottom: 16px;
}

.login-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.login-input {
    width: 100%;
    padding: 12px 14px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: all 0.2s ease;
}
.login-input:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15);
}
.login-input::placeholder {
    color: var(--text-muted);
}

/* 记住我 & 忘记密码 */
.login-options {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    font-size: 0.85rem;
}

.login-remember {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    cursor: pointer;
}
.login-remember input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--accent-green);
}

.login-forgot {
    color: var(--accent-blue);
    font-size: 0.85rem;
}
.login-forgot:hover {
    text-decoration: underline;
}

/* 提交按钮 */
.login-submit {
    width: 100%;
    padding: 12px 20px;
    background: var(--accent-green);
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}
.login-submit:hover {
    background: var(--accent-green-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(35, 134, 54, 0.4);
}
.login-submit:active {
    transform: translateY(0);
}

/* 分隔线 */
.login-divider {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 20px 0;
    color: var(--text-muted);
    font-size: 0.85rem;
}
.login-divider::before,
.login-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-primary);
}

/* 第三方登录按钮 */
.login-social-btns {
    display: flex;
    gap: 12px;
}

.login-social-btn {
    flex: 1;
    padding: 10px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}
.login-social-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-hover);
    transform: translateY(-1px);
}

/* 弹窗底部提示 */
.login-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-primary);
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.login-footer a {
    color: var(--accent-blue);
    font-weight: 500;
}

/* 导航栏登录按钮 */
.login-trigger-btn {
    background: linear-gradient(135deg, var(--accent-green) 0%, #2ea043 100%);
    color: white;
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: all 0.25s var(--ease-out-expo);
    display: flex;
    align-items: center;
    gap: 6px;
}
.login-trigger-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(35, 134, 54, 0.4);
}

/* 成功提示动画 */
.login-success-msg {
    text-align: center;
    padding: 40px 20px;
    animation: scaleIn 0.4s var(--ease-out-back);
}
.login-success-msg .icon {
    font-size: 4rem;
    margin-bottom: 16px;
    animation: float 2s ease-in-out infinite;
}
.login-success-msg h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 8px;
}
.login-success-msg p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}