/* ===== 配色变量 ===== */
:root {
    --bjtu-blue: #1a3c6e;
    --bjtu-blue-light: #2a5a9e;
    --crowd-free: #28a745;
    --crowd-normal: #ffc107;
    --crowd-busy: #dc3545;
    --bottom-nav-height: 60px;
    --top-nav-height: 56px;
}

/* ===== 基础 ===== */
body {
    background: #f5f5f5;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    padding-top: var(--top-nav-height);
    padding-bottom: var(--bottom-nav-height);
    min-height: 100vh;
}

/* ===== 顶部导航（三行布局：品牌→搜索→导航） ===== */
#top-nav {
    background: var(--bjtu-blue);
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    padding: 0;
}
.nav-wrapper { max-width: 960px; margin: 0 auto; padding: 8px 16px; }
.nav-top-row {
    display: flex; align-items: center; gap: 12px;
}
#top-nav .navbar-brand {
    color: #fff; font-weight: 700; font-size: 1.1rem;
    text-decoration: none; white-space: nowrap; flex-shrink: 0;
}
#top-nav .navbar-brand:hover { color: #ffd; }
.brand-text-short { display: none; }
.search-form { flex: 1; max-width: 400px; margin-left: auto; }
.search-input {
    width: 100%; height: 36px; font-size: 0.9rem;
    border-radius: 20px; border: none; padding: 0 16px;
    background: rgba(255,255,255,0.2); color: #fff;
}
.search-input::placeholder { color: rgba(255,255,255,0.7); }
.search-input:focus {
    background: #fff; color: #333; outline: none;
    box-shadow: 0 0 0 3px rgba(255,255,255,0.3);
}
.nav-links-row { justify-content: center; gap: 2px; }
.top-nav-link {
    color: rgba(255,255,255,0.8); text-decoration: none;
    padding: 4px 14px; border-radius: 14px; font-size: 0.8rem;
    display: flex; align-items: center; gap: 4px;
    transition: all 0.15s;
}
.top-nav-link:hover, .top-nav-link.active {
    color: #fff; background: rgba(255,255,255,0.15);
}
:root { --top-nav-height: 84px; }
body { padding-top: 84px; }
@media (max-width: 480px) {
    #top-nav .navbar-brand { font-size: 0.9rem; }
    .brand-text-full { display: none; }
    .brand-text-short { display: inline; }
    :root { --top-nav-height: 56px; }
    body { padding-top: 56px; }
}
@media (min-width: 481px) {
    .brand-text-short { display: none; }
}

#login-btn {
    font-size: 0.85rem;
    border-color: rgba(255,255,255,0.5);
    color: #fff;
    white-space: nowrap;
}

/* ===== 主内容 ===== */
.main-content { min-height: calc(100vh - var(--top-nav-height) - var(--bottom-nav-height)); }

/* ===== 区块标题 ===== */
.section-title {
    font-weight: 700;
    font-size: 1.05rem;
    margin-bottom: 12px;
    padding-bottom: 6px;
    border-bottom: 2px solid var(--bjtu-blue);
    display: flex;
    align-items: center;
    gap: 6px;
}

/* ===== 上新横滚 ===== */
.new-dish-scroll {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    padding-bottom: 8px;
    scroll-snap-type: x mandatory;
}
.new-dish-scroll::-webkit-scrollbar { height: 4px; }
.new-dish-scroll::-webkit-scrollbar-thumb { background: #ccc; border-radius: 4px; }

.new-dish-card {
    flex: 0 0 110px;
    scroll-snap-align: start;
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.2s;
    text-align: center;
}
.new-dish-card:hover { transform: translateY(-2px); }
.new-dish-img {
    height: 80px;
    background: linear-gradient(135deg, #ffecd2, #fcb69f);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.5rem;
}
.new-dish-name {
    padding: 4px 6px 0;
    font-size: 0.8rem;
    color: #333;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.new-dish-price {
    padding: 0 6px 6px;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--bjtu-blue);
}

/* ===== 推荐卡片 ===== */
.rec-card {
    display: block;
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    transition: transform 0.15s;
}
.rec-card:hover { transform: translateY(-2px); }
.rec-card-img {
    height: 90px;
    background: linear-gradient(135deg, #e3f2fd, #bbdefb);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bjtu-blue);
    font-size: 1.5rem;
}
.rec-card-body { padding: 10px 12px; min-height: 52px; display: flex; flex-direction: column; }
.rec-name {
    font-size: 0.85rem; font-weight: 600; color: #333;
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.rec-meta { font-size: 0.7rem; color: #999; margin-bottom: 2px; }
.rec-price-row { display: flex; align-items: center; gap: 4px; margin-top: auto; }
.rec-price { font-weight: 700; color: var(--bjtu-blue); font-size: 0.9rem; }
.rec-price-original {
    font-size: 0.7rem; color: #999; text-decoration: line-through;
}
.rec-rating { font-size: 0.75rem; color: #666; }

/* ===== 食堂卡片 ===== */
.canteen-card {
    display: block;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    transition: transform 0.2s, box-shadow 0.2s;
    height: 100%;
}
.canteen-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}
.canteen-card-body { padding: 16px; }
.canteen-name { color: #333; font-size: 1rem; margin-bottom: 4px; }
.canteen-desc { color: #999; font-size: 0.8rem; margin-bottom: 8px; }

/* 人流量标签 */
.crowd-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}
.crowd-空闲 { background: #d4edda; color: var(--crowd-free); }
.crowd-一般 { background: #fff3cd; color: #856404; }
.crowd-拥挤 { background: #f8d7da; color: var(--crowd-busy); }

/* ===== 档口卡片 ===== */
.stall-card {
    display: block;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    height: 100%;
    transition: transform 0.2s;
}
.stall-card:hover { transform: translateY(-2px); }
.stall-card-body { padding: 14px; }
.stall-card-body h6 { color: #333; margin-bottom: 4px; }

/* ===== 菜品列表 ===== */
.dish-list { display: flex; flex-direction: column; gap: 8px; }
.dish-item {
    display: flex;
    align-items: center;
    gap: 12px;
    background: #fff;
    padding: 12px;
    border-radius: 10px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
    color: #333;
    transition: background 0.15s;
}
.dish-item:hover { background: #f8f9fa; }
.dish-img-placeholder {
    width: 60px;
    height: 60px;
    min-width: 60px;
    border-radius: 8px;
    background: linear-gradient(135deg, #e0e0e0, #f5f5f5);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ccc;
    font-size: 1.5rem;
}
.dish-info { flex: 1; min-width: 0; }
.dish-name { font-weight: 600; font-size: 0.95rem; }
.dish-meta { font-size: 0.8rem; color: #999; margin-top: 2px; }
.dish-tags { font-size: 0.75rem; color: #999; margin-left: 4px; }
.dish-rating { font-size: 0.85rem; margin-top: 2px; }
.dish-price {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--bjtu-blue);
    white-space: nowrap;
    min-width: 50px;
    text-align: right;
}

/* ===== 菜品详情 ===== */
.dish-hero-img {
    width: 100%;
    height: 200px;
    border-radius: 12px;
    background: linear-gradient(135deg, #ffecd2, #fcb69f);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
}

.tag-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 12px;
    background: #e9ecef;
    color: #666;
    font-size: 0.8rem;
    margin-right: 4px;
}

/* ===== 底部导航 ===== */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--bottom-nav-height);
    background: #fff;
    border-top: 1px solid #e0e0e0;
    display: flex;
    z-index: 1000;
}
.bottom-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #999;
    text-decoration: none;
    font-size: 0.7rem;
    transition: color 0.15s;
}
.bottom-nav-item i { font-size: 1.2rem; margin-bottom: 2px; }
.bottom-nav-item.active, .bottom-nav-item:hover { color: var(--bjtu-blue); }

/* ===== 登录/注册页 ===== */
.auth-card {
    max-width: 380px;
    margin: 20px auto;
    background: #fff;
    padding: 24px;
    border-radius: 16px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.1);
}

/* ===== 悬浮按钮 ===== */
.floating-btn {
    position: fixed;
    bottom: calc(var(--bottom-nav-height) + 20px);
    right: 20px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(26,60,110,0.4);
    z-index: 999;
}

/* ===== Flash 消息 ===== */
.flash-container {
    position: fixed;
    top: var(--top-nav-height);
    left: 0;
    right: 0;
    z-index: 1050;
}
.flash-container .alert {
    border-radius: 0;
    margin-bottom: 0;
}

/* ===== 星评组件 ===== */
.star-rating {
    display: flex;
    flex-direction: row-reverse;
    justify-content: flex-end;
    gap: 2px;
}
.star-rating input { display: none; }
.star-rating label {
    cursor: pointer;
    color: #ddd;
    font-size: 1.3rem;
    transition: color 0.15s;
}
.star-rating input:checked ~ label,
.star-rating label:hover,
.star-rating label:hover ~ label {
    color: #ffc107;
}

/* ===== 餐次提示 ===== */
.meal-hint {
    background: linear-gradient(135deg, #fff3cd, #ffe69c);
    padding: 10px 16px;
    border-radius: 10px;
    font-size: 0.9rem;
    font-weight: 600;
    color: #856404;
}

/* ===== 热门榜单 ===== */
.hot-list { display: flex; flex-direction: column; gap: 4px; }
.hot-item {
    display: flex; align-items: center; gap: 10px;
    padding: 8px 10px;
    background: #fff;
    border-radius: 8px;
    color: #333;
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}
.hot-rank {
    width: 22px; height: 22px;
    border-radius: 6px;
    background: #e9ecef;
    font-size: 0.75rem; font-weight: 700;
    display: flex; align-items: center; justify-content: center;
}
.hot-rank.top3 { background: #ffc107; color: #fff; }
.hot-info { flex: 1; min-width: 0; }
.hot-name { font-size: 0.85rem; font-weight: 600; }
.hot-meta { font-size: 0.7rem; color: #999; }
.hot-right { text-align: right; }
.hot-price { font-weight: 700; color: var(--bjtu-blue); font-size: 0.9rem; }
.hot-rating { font-size: 0.75rem; color: #666; display: block; }

/* ===== 菜品动态 ===== */
.changes-scroll {
    display: flex; gap: 8px; overflow-x: auto;
    padding-bottom: 4px;
}
.changes-scroll::-webkit-scrollbar { height: 3px; }
.change-item {
    flex: 0 0 auto;
    padding: 6px 12px;
    background: #f0f8ff;
    border-radius: 16px;
    font-size: 0.8rem;
    white-space: nowrap;
}
.change-name { font-weight: 600; margin-right: 4px; }

/* ===== 菜品搜索下拉 ===== */
.dish-search-wrap { position: relative; flex: 1; min-width: 160px; max-width: 260px; }
.dish-sugg-dropdown {
    position: absolute; top: 100%; left: 0; right: 0;
    background: #fff; border: 1px solid #ddd;
    border-radius: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    z-index: 100; max-height: 200px; overflow-y: auto;
    display: none;
}
.sugg-item {
    padding: 6px 10px; font-size: 0.8rem;
    cursor: pointer; border-bottom: 1px solid #f0f0f0;
}
.sugg-item:hover { background: #f0f7ff; }
.sugg-item:last-child { border-bottom: none; }

/* ===== 帖子评论 ===== */
.post-comments {
    background: #f8f9fa; border-radius: 8px; padding: 10px;
}
.post-comment-item {
    padding: 4px 0; border-bottom: 1px solid #eee;
}
.post-comment-item:last-child { border-bottom: none; }

/* ===== 社区帖子 ===== */
.post-form-card { border: 2px dashed #e0e0e0; border-radius: 14px; }
.post-textarea { border: none; resize: none; font-size: 0.9rem; background: #fafafa; }
.post-textarea:focus { background: #fff; box-shadow: none; }
.post-card {
    border: none; border-radius: 14px;
    background: linear-gradient(180deg, #fff 0%, #fafafa 100%);
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}
.post-avatar {
    width: 36px; height: 36px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-weight: 700; font-size: 0.9rem; flex-shrink: 0;
}
.post-content { font-size: 0.9rem; line-height: 1.5; white-space: pre-wrap; }
.post-dish-link {
    display: inline-block; font-size: 0.75rem;
    color: var(--bjtu-blue); text-decoration: none;
    background: #e8f0fe; padding: 2px 8px; border-radius: 10px;
}
.post-actions { border-top: 1px solid #f0f0f0; padding-top: 6px; }
.community-empty { text-align: center; padding: 60px 20px; }
.community-empty-icon { font-size: 4rem; color: #ddd; display: block; margin-bottom: 12px; }
.community-empty-title { font-size: 1rem; color: #999; margin-bottom: 4px; }
.community-empty-sub { font-size: 0.85rem; color: #ccc; }

/* ===== 打卡鼓励 ===== */
.encourage-card {
    border-radius: 14px; padding: 16px;
    display: flex; align-items: center; gap: 12px;
}
.encourage-full { background: linear-gradient(135deg, #d4edda, #c3e6cb); }
.encourage-half { background: linear-gradient(135deg, #fff3cd, #ffeaa7); }
.encourage-none { background: linear-gradient(135deg, #d6ecfb, #b8d8f0); }
.encourage-icon { font-size: 2rem; flex-shrink: 0; }
.encourage-text { font-size: 0.9rem; font-weight: 600; color: #333; }

/* 随机语录 */
.daily-quote {
    background: linear-gradient(135deg, #e8f0fe 0%, #f0f4ff 100%);
    border-left: 3px solid var(--bjtu-blue);
    border-radius: 8px;
    padding: 12px 16px;
    font-size: 0.85rem;
    color: #555;
    font-style: italic;
    text-align: center;
    letter-spacing: 0.5px;
}

/* ===== 管理后台 ===== */
.stat-card {
    background: #fff;
    border-radius: 10px;
    padding: 16px 8px;
    text-align: center;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}
.stat-num {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--bjtu-blue);
}
.stat-label { font-size: 0.75rem; color: #999; margin-top: 2px; }

/* ===== 评论项 ===== */
.comment-item { padding: 4px 0; }

/* ===== 社区帖子 ===== */
.post-images { display: flex; gap: 6px; flex-wrap: wrap; }
.post-img {
    width: 80px; height: 80px;
    object-fit: cover;
    border-radius: 8px;
}

/* ===== 打卡 ===== */
.checkin-done {
    text-align: center;
    padding: 12px 8px;
    border-radius: 10px;
    background: #d4edda;
    color: #155724;
    font-size: 0.85rem;
}
.checkin-btn { font-size: 0.85rem; }

/* 打卡弹窗 */
.checkin-modal {
    position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    z-index: 2000;
}
.checkin-modal-bg {
    position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
}
.checkin-modal-body {
    position: absolute; bottom: 0; left: 0; right: 0;
    background: #fff;
    border-radius: 16px 16px 0 0;
    padding: 20px;
    max-height: 70vh;
    overflow-y: auto;
}
.dish-check-list {
    max-height: 40vh; overflow-y: auto;
    display: flex; flex-direction: column; gap: 4px;
}
.dish-check-item {
    display: flex; align-items: center; gap: 8px;
    padding: 6px 10px;
    border-radius: 8px;
    background: #f8f9fa;
    cursor: pointer;
    font-size: 0.9rem;
}

/* 日历 */
.cal-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
    text-align: center;
}
.cal-header {
    font-size: 0.7rem;
    font-weight: 700;
    color: #999;
    padding: 4px 0;
}
.cal-cell {
    padding: 6px 2px;
    border-radius: 6px;
    font-size: 0.8rem;
    background: #f5f5f5;
    min-height: 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
.cal-empty { background: transparent; }
.cal-done {
    background: #d4edda;
    font-weight: 600;
}
.cal-done i { color: var(--crowd-free); font-size: 0.6rem; margin-top: -2px; }

/* 排行榜 */
.leaderboard { display: flex; flex-direction: column; gap: 2px; }
.lb-row {
    display: flex; align-items: center; gap: 10px;
    padding: 8px 10px;
    border-radius: 8px;
    font-size: 0.9rem;
}
.lb-row:nth-child(1) { background: #fff3cd; }
.lb-row:nth-child(2) { background: #f5f5f5; }
.lb-row:nth-child(3) { background: #f5e6d0; }
.lb-me { border: 2px solid var(--bjtu-blue); }
.lb-rank { font-weight: 700; width: 24px; text-align: center; }
.lb-name { flex: 1; }
.lb-points { font-weight: 600; color: var(--bjtu-blue); }

/* ===== 桌面端适配 ===== */
@media (min-width: 768px) {
    body { padding-bottom: 0; }
    .main-content { max-width: 720px; margin: 0 auto; }
    .bottom-nav { display: none; }
    .floating-btn { bottom: 20px; }
    .top-nav-link { font-size: 0.85rem; padding: 4px 20px; }
}

/* ===== 分页导航 ===== */
.page-nav {
    display: flex; justify-content: center; align-items: center;
    gap: 4px; flex-wrap: wrap;
}
.page-link {
    display: inline-flex; align-items: center; justify-content: center;
    min-width: 32px; height: 32px; padding: 0 8px;
    border-radius: 6px; font-size: 0.85rem;
    color: var(--bjtu-blue); text-decoration: none;
    border: 1px solid #dee2e6; background: #fff;
    transition: all 0.15s;
}
.page-link:hover { background: #e9ecef; text-decoration: none; }
.page-link.active {
    background: var(--bjtu-blue); color: #fff;
    border-color: var(--bjtu-blue); font-weight: 600;
}