/* =========================================================================
   广工杯 / GXTUCTF — 主样式
   视觉与动效参考 https://www.ctf.vin/（MilkDragonCTF 落地页）
   纯静态、零依赖；字体文件在 assets/fonts/，由 fonts.css 以 @font-face 引入
   ========================================================================= */

:root {
    --bg-color: #000000;
    --text-primary: #ffffff;
    --text-secondary: #aaaaaa;
    --border-color: rgba(255, 255, 255, 0.1);
    --accent-color: #ffffff;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --acrylic-bg: rgba(20, 20, 20, 0.6);
    --blur-val: 20px;

    /* 全部交互动效统一使用这两条缓动曲线 */
    --transition-fast: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.77, 0, 0.175, 1);

    /* 字体栈：拉丁用自托管 Share Tech Mono，中文回退到系统黑体 */
    --font-mono: 'Share Tech Mono', 'Noto Sans SC', 'Microsoft YaHei',
        'PingFang SC', 'Hiragino Sans GB', 'Source Han Sans SC', sans-serif;
}

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

html {
    height: 100%;
}

body {
    font-family: var(--font-mono);
    background-color: var(--bg-color);
    /* 中心微亮的径向渐变，让纯黑背景有层次 */
    background-image: radial-gradient(circle at 50% 50%, #111 0%, #000 100%);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

/* 选中文字时反色，保持黑白单色气质 */
::selection {
    background: var(--text-primary);
    color: var(--bg-color);
}

/* 键盘焦点可见（鼠标点击不出现） */
:focus-visible {
    outline: 1px solid var(--text-secondary);
    outline-offset: 4px;
}

/* ============================== 顶栏 ============================== */

.global-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 60px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 30px;
    z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur-val));
    -webkit-backdrop-filter: blur(var(--blur-val));
    border-bottom: 1px solid var(--border-color);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 30px;
}

.home-icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 10px 0;
    font-family: inherit;
    font-size: 0.9rem;
    cursor: pointer;
    letter-spacing: 4px;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    position: relative;
    font-weight: 700;
    text-transform: uppercase;
}

/* hover 时两侧淡入的方括号 [ ... ] */
.home-icon-btn::before {
    content: '[';
    margin-right: 8px;
    opacity: 0;
    transition: var(--transition-fast);
}

.home-icon-btn::after {
    content: ']';
    margin-left: 8px;
    opacity: 0;
    transition: var(--transition-fast);
}

.home-icon-btn:hover {
    color: var(--text-primary);
    background: transparent;
}

.home-icon-btn:hover::before,
.home-icon-btn:hover::after {
    opacity: 1;
}

.brand-title {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 4px;
    text-transform: uppercase;
    /* 解码动画是逐字替换 innerHTML，预留宽度避免抖动 */
    white-space: nowrap;
}

/* ============================== 主体骨架 ============================== */

#app-container {
    display: flex;
    width: 100vw;
    height: calc(100vh - 60px);
    margin-top: 60px;
}

.sidebar {
    width: 120px;
    height: 100%;
    border-right: 1px solid var(--border-color);
    background: var(--acrylic-bg);
    backdrop-filter: blur(var(--blur-val));
    -webkit-backdrop-filter: blur(var(--blur-val));
    z-index: 100;
}

.year-nav {
    height: 100%;
    overflow-y: auto;
    scrollbar-width: none; /* Firefox */
}

.year-nav::-webkit-scrollbar {
    display: none; /* Chrome / Safari */
}

.year-list {
    list-style: none;
    padding: 20px 0;
}

.year-item {
    padding: 25px 0;
    cursor: pointer;
    font-size: 1.1rem;
    color: var(--text-secondary);
    transition: var(--transition-fast);
    text-align: center;
    letter-spacing: 2px;
    border-bottom: 1px solid transparent;
}

.year-item:hover,
.year-item.active {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.year-item.active {
    border-right: 2px solid var(--text-primary);
}

.content-area {
    flex-grow: 1;
    position: relative;
    overflow: hidden;
}

/* ====================== 视图叠层（交叉淡入淡出） ====================== */

.view {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    background-color: transparent;
    visibility: hidden;
    opacity: 0;
    /* opacity 做淡出，visibility 负责延迟隐藏，避免透明层挡住鼠标 */
    transition: opacity var(--transition-fast), visibility var(--transition-fast);
}

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

/* ============================== 首页 ============================== */

#home-view {
    position: absolute;
    top: -60px;
    left: 0;
    width: 100%;
    height: 100vh;
    z-index: 50;
    display: flex;
    justify-content: center;
    align-items: center;
    pointer-events: none;
}

#home-view.active {
    pointer-events: all;
}

.center-content {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
}

.home-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 28px;
}

/* 四角装饰小字 */
.home-decor {
    position: absolute;
    color: var(--text-secondary);
    font-size: 0.75rem;
    letter-spacing: 2px;
    opacity: 0.4;
    pointer-events: none;
}

.decor-top-left { top: 40px; left: 60px; }
.decor-top-right { top: 40px; right: 60px; }
.decor-bottom-left { bottom: 40px; left: 60px; }
.decor-bottom-right { bottom: 40px; right: 60px; }

.decor-center-line {
    top: 50%;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
    transform: translateY(-50%);
    opacity: 0.2;
}

/* ---------------------------- 主按钮 ENTER ---------------------------- */

.main-enter-btn {
    position: relative;
    background: transparent;
    border: 2px solid var(--text-primary);
    color: var(--text-primary);
    padding: 20px 80px;
    font-size: 3rem;
    font-weight: 900;
    text-decoration: none;
    letter-spacing: 15px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    /* 上下边斜切角，硬朗的科幻感 */
    clip-path: polygon(20px 0%, 100% 0%, calc(100% - 20px) 100%, 0% 100%);
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    min-width: 400px;
}

.main-enter-btn:hover {
    background: var(--text-primary);
    color: var(--bg-color);
    letter-spacing: 20px;
    box-shadow: 0 0 50px rgba(255, 255, 255, 0.4);
    transform: scale(1.05);
}

/* ============================ 数据视图 ============================ */

.tab-nav {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    padding: 30px 60px;
    gap: 40px;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 1rem;
    cursor: pointer;
    letter-spacing: 3px;
    transition: var(--transition-fast);
    position: relative;
}

.tab-btn:hover,
.tab-btn.active {
    color: var(--text-primary);
}

/* active 下划线 */
.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--text-primary);
}

.panel-container {
    flex-grow: 1;
    padding: 60px 80px;
    overflow-y: auto;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.section-title {
    font-size: 3rem;
    margin-bottom: 50px;
    letter-spacing: 6px;
    font-weight: 700;
    text-transform: uppercase;
}

/* 玻璃卡片 */
.info-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    padding: 40px;
}

.info-card p {
    font-size: 1.3rem;
    line-height: 2;
    color: var(--text-secondary);
    max-width: 900px;
}

/* ---------------------- DETAIL 富文本（.detail-body） ---------------------- */
/* 结构：<h4> 大节标题 / <h5> 小节标题 / <ul><li> 列表 / <table> 奖项表      */

.detail-body {
    font-size: 1rem;
    line-height: 1.9;
    color: var(--text-secondary);
    max-width: 1000px;
}

.detail-body h4 {
    color: var(--text-primary);
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 3px;
    margin: 44px 0 18px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.detail-body h4:first-child {
    margin-top: 0;
}

.detail-body h5 {
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 2px;
    margin: 32px 0 14px;
}

.detail-body p {
    font-size: 1rem;
    line-height: 1.95;
    color: var(--text-secondary);
    max-width: none;
    margin: 0 0 16px;
}

.detail-body ul {
    list-style: none;
    margin: 0 0 8px;
    padding-left: 0;
}

.detail-body ul li {
    position: relative;
    padding-left: 22px;
    margin-bottom: 12px;
    font-size: 1rem;
    line-height: 1.9;
}

/* 一级列表用破折号，二级列表用间隔点 */
.detail-body ul li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--text-secondary);
    opacity: 0.55;
}

.detail-body ul ul {
    margin: 10px 0 0;
}

.detail-body ul ul li::before {
    content: '·';
    opacity: 0.8;
}

.detail-body strong {
    color: var(--text-primary);
    font-weight: 700;
}

.detail-body a {
    color: var(--text-primary);
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: var(--transition-fast);
}

.detail-body a:hover {
    background: var(--text-primary);
    color: var(--bg-color);
    text-decoration: none;
}

/* 卡片内表格收紧（表格横向可滚动，窄屏不撑破布局） */
.table-wrapper {
    overflow-x: auto;
}

.detail-body .minimal-table {
    margin: 6px 0 10px;
}

.detail-body .minimal-table th {
    padding: 12px 16px;
    font-size: 0.8rem;
    letter-spacing: 2px;
    white-space: nowrap;
}

.detail-body .minimal-table td {
    padding: 16px;
    font-size: 0.95rem;
    line-height: 1.8;
    vertical-align: top;
}

.detail-body .minimal-table td:first-child {
    color: var(--text-primary);
    font-weight: 700;
    white-space: nowrap;
}

.detail-body .minimal-table td:nth-child(2) {
    color: var(--text-primary);
    white-space: nowrap;
}

/* 极简表格 */
.minimal-table {
    width: 100%;
    border-collapse: collapse;
}

.minimal-table th {
    text-align: left;
    padding: 25px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-bottom: 1px solid var(--border-color);
    letter-spacing: 2px;
}

.minimal-table td {
    padding: 25px;
    border-bottom: 1px solid var(--border-color);
    font-size: 1.2rem;
}

/* 排行榜空数据占位行 */
.table-empty td {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.95rem;
    letter-spacing: 4px;
    padding: 70px 25px;
}

/* ============================== 滚动条 ============================== */

::-webkit-scrollbar {
    width: 4px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* ============================== 响应式 ============================== */

@media (max-width: 992px) {
    .main-enter-btn {
        font-size: 4rem;
        letter-spacing: 15px;
    }
    .panel-container {
        padding: 40px;
    }
    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    /* 窄屏：收紧留白，否则富文本正文会被挤成一条细缝 */
    .tab-nav {
        padding: 20px 20px;
        gap: 24px;
        overflow-x: auto;
        scrollbar-width: none;
    }
    .tab-nav::-webkit-scrollbar {
        display: none;
    }
    .tab-btn {
        white-space: nowrap;
    }
    .panel-container {
        padding: 24px 16px 40px;
    }
    .section-title {
        font-size: 1.6rem;
        letter-spacing: 2px;
        margin-bottom: 28px;
    }
    .info-card {
        padding: 20px 16px;
    }
    .detail-body {
        font-size: 0.95rem;
    }
    .detail-body h4 {
        font-size: 1.05rem;
        letter-spacing: 1px;
        margin: 32px 0 14px;
    }
    .detail-body .minimal-table th,
    .detail-body .minimal-table td {
        padding: 10px 12px;
        font-size: 0.85rem;
    }

    /* 窄屏下表格改成「卡片式」：每行变成一块，用 data-label 显示列名 */
    .detail-body .minimal-table thead {
        display: none;
    }
    .detail-body .minimal-table,
    .detail-body .minimal-table tbody,
    .detail-body .minimal-table tr,
    .detail-body .minimal-table td {
        display: block;
        width: 100%;
    }
    .detail-body .minimal-table tr {
        padding: 16px 0;
        border-bottom: 1px solid var(--border-color);
    }
    .detail-body .minimal-table tr:last-child {
        border-bottom: none;
    }
    .detail-body .minimal-table td {
        border: none;
        padding: 3px 0;
        white-space: normal;
    }
    .detail-body .minimal-table td::before {
        content: attr(data-label) '：';
        color: var(--text-secondary);
        opacity: 0.65;
        margin-right: 2px;
    }
    .detail-body .minimal-table td:first-child::before {
        content: none;
    }
    .detail-body .minimal-table td:first-child {
        font-size: 1rem;
        margin-bottom: 4px;
    }
}

@media (max-width: 480px) {
    .global-header {
        padding: 0 16px;
    }
    .header-actions {
        gap: 16px;
    }
    .home-icon-btn {
        font-size: 0.75rem;
        letter-spacing: 2px;
    }
    .brand-title {
        display: none;
    }
    .sidebar {
        width: 84px;
    }
    .year-item {
        font-size: 1rem;
        padding: 20px 0;
    }
    .info-card {
        padding: 16px 12px;
    }
    .detail-body h4 {
        font-size: 1rem;
    }
}

/* ========================= 动效降级（系统偏好） ========================= */
@media (prefers-reduced-motion: reduce) {
    .main-enter-btn,
    .home-icon-btn,
    .view,
    .tab-btn,
    .year-item {
        transition-duration: 0.01ms;
    }
}