/* ============================================================
   小飞鱼技术研究站 - 全局样式
   主题：深蓝科技感
   扩展说明：修改 :root 中的 CSS 变量即可换肤
   ============================================================ */

/* ---------- CSS 变量（主题配置） ---------- */
:root {
    /* 主色调 */
    --color-primary: #00d4ff;
    --color-primary-dark: #0099cc;
    --color-primary-light: #66e5ff;
    --color-accent: #00ffaa;

    /* 背景色 */
    --bg-dark: #0a1628;
    --bg-darker: #060e1a;
    --bg-card: #112240;
    --bg-card-hover: #1a3355;
    --bg-input: #0d1b2e;

    /* 文字色 */
    --text-primary: #e6f1ff;
    --text-secondary: #8892b0;
    --text-muted: #5a6580;
    --text-inverse: #0a1628;

    /* 边框 */
    --border-color: #1e3a5f;
    --border-light: #2a4a6f;

    /* 状态色 */
    --color-success: #00ffaa;
    --color-warning: #ffb800;
    --color-error: #ff6b6b;
    --color-info: #00d4ff;

    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.3);

    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 40px;
    --spacing-2xl: 64px;

    /* 导航 */
    --navbar-height: 70px;

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

/* ---------- 重置与基础 ---------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
                 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* 背景网格装饰 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: 0;
}

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

a:hover {
    color: var(--color-primary-light);
}

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

.hidden {
    display: none !important;
}

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 22px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: var(--text-inverse);
    box-shadow: 0 2px 10px rgba(0, 212, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 212, 255, 0.5);
    color: var(--text-inverse);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}

.btn-outline:hover {
    background: rgba(0, 212, 255, 0.1);
}

.btn-block {
    width: 100%;
    padding: 14px;
    font-size: 16px;
}

.btn-text {
    background: none;
    border: none;
    color: var(--color-primary);
    cursor: pointer;
    font-size: 13px;
    padding: 2px 6px;
    font-family: inherit;
}

.btn-text:hover {
    text-decoration: underline;
}

/* ---------- 导航栏 ---------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: rgba(10, 22, 40, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
    background: rgba(10, 22, 40, 0.95);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    flex-shrink: 0;
}

.brand-icon {
    font-size: 28px;
}

.brand-text {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.5px;
}

.brand-sub {
    font-size: 11px;
    color: var(--text-muted);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
    justify-content: center;
}

.nav-item {
    position: relative;
    padding: 10px 16px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.nav-item:hover {
    color: var(--text-primary);
    background: rgba(0, 212, 255, 0.08);
}

.nav-item.active {
    color: var(--color-primary);
}

.nav-item.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

.user-area {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

.user-info:hover {
    background: rgba(0, 212, 255, 0.08);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--text-inverse);
    font-size: 14px;
}

.user-name {
    font-size: 14px;
    color: var(--text-primary);
}

/* 移动端菜单按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* ---------- 主内容区 ---------- */
.main-content {
    flex: 1;
    margin-top: var(--navbar-height);
    position: relative;
    z-index: 1;
}

.page-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* ---------- 首页 Hero 区 ---------- */
.hero {
    padding: var(--spacing-2xl) var(--spacing-lg);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: 20px;
    font-size: 13px;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
}

.hero-title {
    font-size: clamp(32px, 5vw, 56px);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--color-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(16px, 2vw, 20px);
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto var(--spacing-xl);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ---------- 板块卡片网格 ---------- */
.section {
    padding: var(--spacing-2xl) var(--spacing-lg);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: clamp(24px, 3vw, 36px);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.section-desc {
    color: var(--text-secondary);
    font-size: 16px;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.tech-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

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

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

.tech-card:hover::before {
    transform: scaleX(1);
}

.card-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: var(--spacing-md);
    background: rgba(0, 212, 255, 0.1);
}

.card-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.card-desc {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.card-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 12px;
    color: var(--text-muted);
}

.card-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.card-arrow {
    position: absolute;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    color: var(--color-primary);
    font-size: 20px;
    transition: transform var(--transition-fast);
}

.tech-card:hover .card-arrow {
    transform: translateX(4px);
}

/* ---------- 板块详情页 ---------- */
.module-header {
    padding: var(--spacing-xl) var(--spacing-lg);
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.08), transparent);
    border-bottom: 1px solid var(--border-color);
}

.module-header-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.module-icon {
    width: 72px;
    height: 72px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    background: rgba(0, 212, 255, 0.15);
    flex-shrink: 0;
}

.module-info h1 {
    font-size: 28px;
    margin-bottom: 6px;
}

.module-info p {
    color: var(--text-secondary);
    font-size: 15px;
}

.module-body {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* 文章/内容卡片 */
.article-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.article-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.article-item:hover {
    border-color: var(--color-primary);
    transform: translateX(4px);
}

.article-tag {
    display: inline-block;
    padding: 2px 10px;
    background: rgba(0, 212, 255, 0.1);
    color: var(--color-primary);
    border-radius: 4px;
    font-size: 12px;
    margin-bottom: 8px;
}

.article-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.article-excerpt {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.article-meta {
    display: flex;
    gap: var(--spacing-md);
    font-size: 12px;
    color: var(--text-muted);
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--text-muted);
}

.empty-state-icon {
    font-size: 64px;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

/* ---------- 登录模态框 ---------- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(6, 14, 26, 0.8);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    padding: var(--spacing-md);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 420px;
    padding: var(--spacing-xl);
    position: relative;
    transform: translateY(20px) scale(0.95);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-lg);
}

.modal-overlay.active .modal {
    transform: translateY(0) scale(1);
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 24px;
    cursor: pointer;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.auth-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 4px;
}

.auth-subtitle {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 6px;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 12px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    transition: all var(--transition-fast);
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.15);
}

.form-group input::placeholder {
    color: var(--text-muted);
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    font-size: 13px;
}

.checkbox {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    cursor: pointer;
}

.checkbox input {
    accent-color: var(--color-primary);
}

.link {
    color: var(--color-primary);
    cursor: pointer;
}

.link:hover {
    text-decoration: underline;
}

.auth-switch {
    text-align: center;
    margin-top: var(--spacing-lg);
    font-size: 13px;
    color: var(--text-secondary);
}

.auth-demo {
    margin-top: var(--spacing-md);
    padding: 10px 14px;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    font-size: 12px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.auth-demo code {
    background: rgba(0, 212, 255, 0.1);
    padding: 2px 8px;
    border-radius: 4px;
    color: var(--color-primary);
    font-family: 'Consolas', monospace;
}

/* ---------- Toast 提示 ---------- */
.toast-container {
    position: fixed;
    top: calc(var(--navbar-height) + 16px);
    right: 16px;
    z-index: 3000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 12px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    font-size: 14px;
    color: var(--text-primary);
    transform: translateX(120%);
    transition: transform var(--transition-normal);
    min-width: 240px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.toast.show {
    transform: translateX(0);
}

.toast.success { border-left: 3px solid var(--color-success); }
.toast.error { border-left: 3px solid var(--color-error); }
.toast.warning { border-left: 3px solid var(--color-warning); }
.toast.info { border-left: 3px solid var(--color-info); }

/* ---------- 底部 ---------- */
.footer {
    background: var(--bg-darker);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-lg);
    position: relative;
    z-index: 1;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
}

.footer-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 14px;
}

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

.footer-divider {
    height: 1px;
    background: var(--border-color);
    margin-bottom: var(--spacing-lg);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    font-size: 13px;
    color: var(--text-muted);
}

.icp-info {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.icp-info a {
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
}

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

.icp-sep {
    color: var(--text-muted);
}

.police-icon {
    width: 14px;
    height: 14px;
    vertical-align: middle;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
}

.breadcrumb a {
    color: var(--text-secondary);
    cursor: pointer;
}

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

.breadcrumb-sep {
    color: var(--text-muted);
}

/* ---------- 响应式 ---------- */
@media (max-width: 968px) {
    .nav-menu {
        position: fixed;
        top: var(--navbar-height);
        left: 0;
        right: 0;
        background: var(--bg-darker);
        flex-direction: column;
        padding: var(--spacing-md);
        gap: 4px;
        border-bottom: 1px solid var(--border-color);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
        z-index: 999;
    }

    .nav-menu.open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

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

    .nav-toggle {
        display: flex;
    }

    .brand-sub {
        display: none;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 640px) {
    .nav-container {
        padding: 0 var(--spacing-md);
    }

    .brand-text {
        font-size: 15px;
    }

    .hero {
        padding: var(--spacing-xl) var(--spacing-md);
    }

    .section {
        padding: var(--spacing-xl) var(--spacing-md);
    }

    .module-header-inner {
        flex-direction: column;
        text-align: center;
    }

    .page-container {
        padding: var(--spacing-lg) var(--spacing-md);
    }

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

/* ---------- 动画 ---------- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-in {
    animation: fadeInUp 0.5s ease forwards;
}

.animate-in-delay-1 { animation-delay: 0.1s; opacity: 0; }
.animate-in-delay-2 { animation-delay: 0.2s; opacity: 0; }
.animate-in-delay-3 { animation-delay: 0.3s; opacity: 0; }
.animate-in-delay-4 { animation-delay: 0.4s; opacity: 0; }

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-darker);
}

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary-dark);
}

/* ============================================================
   公告栏样式
   ============================================================ */
.announcement-section {
    padding: 0 var(--spacing-lg) var(--spacing-xl);
}

.announcement-container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.announcement-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: rgba(0, 212, 255, 0.08);
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    font-size: 14px;
    color: var(--color-primary);
}

.announcement-icon {
    font-size: 18px;
}

.announcement-list {
    padding: 8px 0;
}

.announcement-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 20px;
    transition: background var(--transition-fast);
    border-bottom: 1px solid rgba(30, 58, 95, 0.5);
}

.announcement-item:last-child {
    border-bottom: none;
}

.announcement-item:hover {
    background: rgba(0, 212, 255, 0.05);
}

.announcement-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.announcement-tag {
    font-size: 11px;
    padding: 2px 8px;
    border: 1px solid;
    border-radius: 4px;
    flex-shrink: 0;
    font-weight: 600;
}

.announcement-title {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
    flex-shrink: 0;
}

.announcement-content {
    font-size: 13px;
    color: var(--text-secondary);
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.announcement-date {
    font-size: 12px;
    color: var(--text-muted);
    flex-shrink: 0;
}

@media (max-width: 640px) {
    .announcement-item {
        flex-wrap: wrap;
        gap: 6px;
    }
    .announcement-content {
        width: 100%;
        white-space: normal;
    }
}

/* ============================================================
   资源下载板块样式
   ============================================================ */
.resource-filters {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.resource-filter-btn {
    padding: 6px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
}

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

.resource-filter-btn.active {
    background: rgba(0, 212, 255, 0.15);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
}

.resource-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    transition: all var(--transition-fast);
    display: flex;
    flex-direction: column;
}

.resource-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

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

.resource-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    background: rgba(0, 212, 255, 0.1);
}

.resource-format {
    font-size: 11px;
    padding: 2px 8px;
    background: rgba(0, 255, 170, 0.1);
    color: var(--color-accent);
    border-radius: 4px;
    font-weight: 600;
    text-transform: uppercase;
}

.resource-name {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.resource-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
    flex: 1;
}

.resource-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
    font-size: 12px;
    color: var(--text-muted);
}

.resource-download-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: var(--text-inverse);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    font-family: inherit;
}

.resource-download-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 212, 255, 0.4);
    color: var(--text-inverse);
}

/* ============================================================
   背景鲸鱼动画
   ============================================================ */
.whale-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
    opacity: 0;
    transition: opacity 0.8s ease;
}

.whale-bg.active {
    opacity: 1;
}

/* 水平游动：从左游到右 */
.whale-swim {
    position: absolute;
    top: 22%;
    left: -25%;
    width: 420px;
    animation: whaleSwim 45s linear infinite;
    animation-delay: -12s;
}

@keyframes whaleSwim {
    0% {
        left: -25%;
        transform: scaleX(1);
    }
    49% {
        left: 105%;
        transform: scaleX(1);
    }
    50% {
        left: 105%;
        transform: scaleX(-1);
    }
    99% {
        left: -25%;
        transform: scaleX(-1);
    }
    100% {
        left: -25%;
        transform: scaleX(1);
    }
}

/* 上下浮动 */
.whale-float {
    animation: whaleFloat 6s ease-in-out infinite;
}

@keyframes whaleFloat {
    0%, 100% {
        transform: translateY(-20px);
    }
    50% {
        transform: translateY(20px);
    }
}

/* 鲸鱼SVG */
.whale-svg {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 8px 24px rgba(0, 150, 200, 0.2));
}

/* 尾巴摆动 */
.whale-tail {
    transform-origin: 45px 80px;
    animation: tailWag 2.5s ease-in-out infinite;
}

@keyframes tailWag {
    0%, 100% {
        transform: rotate(-5deg);
    }
    50% {
        transform: rotate(8deg);
    }
}

/* 喷水动画 */
.whale-spout {
    animation: spout 4s ease-in-out infinite;
    transform-origin: 165px 38px;
}

@keyframes spout {
    0%, 100% {
        opacity: 0.3;
        transform: scaleY(0.8);
    }
    50% {
        opacity: 0.8;
        transform: scaleY(1.2);
    }
}

/* 气泡 */
.bubble {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.4), rgba(100,200,255,0.15));
    border: 1px solid rgba(255,255,255,0.2);
    animation: bubbleRise 8s ease-in infinite;
    opacity: 0;
}

.bubble-1 {
    width: 12px;
    height: 12px;
    left: 30%;
    bottom: -20px;
    animation-delay: 0s;
    animation-duration: 9s;
}

.bubble-2 {
    width: 8px;
    height: 8px;
    left: 45%;
    bottom: -20px;
    animation-delay: 2s;
    animation-duration: 7s;
}

.bubble-3 {
    width: 16px;
    height: 16px;
    left: 60%;
    bottom: -20px;
    animation-delay: 4s;
    animation-duration: 10s;
}

.bubble-4 {
    width: 6px;
    height: 6px;
    left: 75%;
    bottom: -20px;
    animation-delay: 1s;
    animation-duration: 6s;
}

.bubble-5 {
    width: 10px;
    height: 10px;
    left: 20%;
    bottom: -20px;
    animation-delay: 5s;
    animation-duration: 8s;
}

@keyframes bubbleRise {
    0% {
        transform: translateY(0) scale(0.5);
        opacity: 0;
    }
    10% {
        opacity: 0.6;
    }
    90% {
        opacity: 0.4;
    }
    100% {
        transform: translateY(-100vh) scale(1);
        opacity: 0;
    }
}

/* 响应式：小屏幕鲸鱼小一些 */
@media (max-width: 768px) {
    .whale-swim {
        width: 280px;
        animation-duration: 35s;
    }
}

@media (max-width: 480px) {
    .whale-swim {
        width: 220px;
    }
}