:root {
    --color-primary: #5c889f;
    --color-primary-dark: #3d6276;
    --color-primary-light: #8fb3c4;
    --color-accent: #d9a05b;
    --color-accent-dark: #b97f3c;
    --color-bg: #eef3f5;
    --color-card: #ffffff;
    --color-border: #d9e3e9;
    --color-text: #2c3840;
    --color-muted: #7a8f9a;
    --color-dark: #22323c;
    --color-dark-deep: #1a252d;
    --grad-main: linear-gradient(120deg, #5c889f 0%, #3d6276 70%, #d9a05b 160%);
    --grad-accent: linear-gradient(135deg, #d9a05b 0%, #b97f3c 100%);
}

html {
    min-height: 100vh;
}

body {
    font-family: "MiSans", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", -apple-system, "Segoe UI", Roboto, sans-serif;
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    letter-spacing: 0.3px;
    font-size: 13px;
    background: var(--color-bg);
}

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

a:hover {
    color: var(--color-accent-dark);
}

/* ============ 左侧垂直导航布局 ============ */
.layout {
    display: flex;
    min-height: 100vh;
}

.side-nav {
    width: 200px;
    flex-shrink: 0;
    background: var(--color-dark);
    color: #b9cbd5;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
}

.side-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 22px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.brand-mark {
    width: 34px;
    height: 34px;
    border-radius: 0;
    background: var(--grad-accent);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 16px;
    flex-shrink: 0;
    box-shadow: 0 6px 16px rgba(217, 160, 91, 0.35);
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.15;
}

.brand-name {
    font-size: 16px;
    font-weight: 700;
    color: #f0f5f8;
    letter-spacing: 0.5px;
}

.brand-name em {
    font-style: normal;
    color: var(--color-accent);
}

.brand-sub {
    font-size: 10px;
    letter-spacing: 2.5px;
    color: #6d8896;
    font-weight: 600;
    margin-top: 3px;
}

.side-menu {
    flex: 1;
    padding: 18px 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    overflow-y: auto;
}

.side-menu .menu-label {
    font-size: 11px;
    color: #5d7683;
    letter-spacing: 2px;
    padding: 10px 12px 6px;
    font-weight: 700;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #b9cbd5;
    font-weight: 500;
    padding: 8px 12px;
    transition: all 0.2s;
    font-size: 13px;
}

.nav-link i {
    width: 16px;
    text-align: center;
    color: #7fa0af;
    transition: color 0.2s;
}

.nav-link:hover {
    color: #fff;
    background: rgba(92, 136, 159, 0.22);
}

.nav-link:hover i {
    color: var(--color-accent);
}

.nav-link.active {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 6px 14px rgba(92, 136, 159, 0.4);
}

.nav-link.active i {
    color: #fff;
}

.side-foot {
    padding: 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 12px;
    color: #6d8896;
}

.side-qr {
    background: #fff;
    border-radius: 0;
    padding: 10px;
    text-align: center;
    margin-bottom: 10px;
}

.side-qr img {
    width: 100%;
    border-radius: 0;
    display: block;
}

.side-qr span {
    display: block;
    margin-top: 8px;
    font-size: 11px;
    color: var(--color-primary-dark);
    font-weight: 700;
}

.main-wrap {
    flex: 1;
    margin-left: 200px;
    min-width: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* 顶栏 */
.top-bar {
    background: var(--color-card);
    border-bottom: 1px solid var(--color-border);
    padding: 0 24px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 13px;
    color: var(--color-muted);
    position: sticky;
    top: 0;
    z-index: 90;
    box-shadow: 0 2px 10px rgba(44, 56, 64, 0.04);
}

.top-bar a {
    color: var(--color-primary);
    font-weight: 600;
}

.top-bar a:hover {
    color: var(--color-accent-dark);
}

.top-bar .tb-left {
    display: flex;
    align-items: center;
    gap: 8px;
}

.top-bar .tb-left i {
    color: var(--color-accent);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
    box-sizing: border-box;
}

main.page-body {
    flex: 1;
}

/* ============ 面包屑 ============ */
.breadcrumb {
    padding: 12px 28px;
    font-size: 13px;
    color: var(--color-muted);
    border-bottom: 1px dashed var(--color-border);
    background: transparent;
}

.breadcrumb a {
    color: var(--color-primary);
    font-weight: 600;
}

/* ============ 通用卡片 / 按钮 / 表单 ============ */
.video-card {
    transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
    border-radius: 0;
    overflow: hidden;
    background: var(--color-card);
    border: 1px solid var(--color-border);
}

.video-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 14px 30px rgba(61, 98, 118, 0.16);
    border-color: var(--color-primary-light);
}

.page-title {
    font-size: 24px;
    font-weight: 800;
    padding: 14px 0;
    color: var(--color-text);
}

.btn-primary {
    background: var(--grad-main);
    color: #fff;
    padding: 8px 22px;
    border: none;
    font-weight: 600;
    border-radius: 0;
    transition: all 0.2s;
    box-shadow: 0 6px 16px rgba(92, 136, 159, 0.35);
    cursor: pointer;
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 10px 22px rgba(61, 98, 118, 0.4);
}

.form-control {
    border: 1px solid var(--color-border);
    padding: 9px 13px;
    font-size: 13px;
    width: 100%;
    border-radius: 0;
    background: #f7fafb;
    color: var(--color-text);
    transition: all 0.2s;
    box-sizing: border-box;
}

.form-control::placeholder {
    color: #a4b6bf;
}

.form-control:focus {
    border-color: var(--color-primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(92, 136, 159, 0.18);
    background: #fff;
}

.sidebar {
    background-color: var(--color-card);
    padding: 20px;
    min-height: 400px;
    border-radius: 0;
    border: 1px solid var(--color-border);
}

.chatroom {
    background-color: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 0;
}

.chat-message {
    padding: 10px;
    border-bottom: 1px solid var(--color-border);
    font-size: 14px;
    color: var(--color-text);
}

.notice {
    background-color: rgba(217, 160, 91, 0.1);
    border: 1px solid rgba(217, 160, 91, 0.4);
    padding: 14px 16px;
    font-size: 13px;
    color: var(--color-accent-dark);
    border-radius: 0;
}

/* ============ 页脚 ============ */
.footer {
    background: var(--color-dark-deep);
    color: #8ba4b1;
    padding: 30px 0;
    font-size: 14px;
}

.footer a {
    color: #a9c0cc;
}

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

#footerWenhua2 {
    display: flex;
    justify-content: center;
    align-items: center;
}