/* ============================================================
   中国大运河扬州段历史遗迹数据系统
   样式主题：新中式 · 水墨（宣纸 / 墨色 / 青瓷 / 古铜）
   ============================================================ */

:root {
    /* —— 质感底色 —— */
    --paper:      #f4f0e8;   /* 宣纸米底 */
    --paper-2:    #efe9dd;   /* 略深米 */
    --card:       #fdfbf6;   /* 卡片暖白 */

    /* —— 文字墨色 —— */
    --ink:        #1f2421;   /* 浓墨（标题） */
    --ink-2:      #3a3530;
    --text:       #4a443c;   /* 正文 */
    --muted:      #8a8278;   /* 次要文字 */

    /* —— 线条 —— */
    --line:       #e3dccc;
    --line-2:     #d6cdb8;

    /* —— 点缀色 —— */
    --celadon:    #2d5f5d;   /* 青瓷（主色） */
    --celadon-d:  #234a48;
    --celadon-tint: #e7efed;
    --bronze:     #9c6b3f;   /* 古铜 */
    --bronze-d:   #7e5530;

    /* —— 分类色（低饱和墨韵系） —— */
    --c-temple:    #3d6b5c;
    --c-heritage:  #2f5566;
    --c-ancient:   #9a6b3f;
    --c-residence: #7d4a5a;
    --c-other:     #5f5a52;

    /* —— 形态 —— */
    --radius:    6px;
    --radius-lg: 10px;
    --shadow:        0 1px 2px rgba(31,36,33,.04), 0 6px 18px rgba(31,36,33,.06);
    --shadow-hover:  0 2px 6px rgba(31,36,33,.05), 0 14px 34px rgba(31,36,33,.10);

    /* —— 字体 —— */
    --serif: 'Noto Serif SC','Source Han Serif SC','Songti SC',STSong,'STZhongsong',SimSun,serif;
    --sans:  -apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei','微软雅黑',Arial,sans-serif;
}

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

body {
    font-family: var(--sans);
    line-height: 1.7;
    color: var(--text);
    background: var(--paper);
    background-image:
        radial-gradient(circle at 12% 16%, rgba(45,95,93,.045), transparent 42%),
        radial-gradient(circle at 88% 84%, rgba(156,107,63,.045), transparent 44%);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

.container {
    max-width: 1240px;
    margin: 0 auto;
    padding: 40px 28px 60px;
    background: transparent;
    min-height: 100vh;
    box-shadow: none;
}

/* ============================ 标题区 ============================ */
header {
    text-align: center;
    margin-bottom: 30px;
    padding: 8px 0 26px;
    border-bottom: none;
    position: relative;
}

header h1 {
    font-family: var(--serif);
    font-size: 2.4rem;
    font-weight: 600;
    letter-spacing: .08em;
    color: var(--ink);
    margin-bottom: 16px;
    text-shadow: none;
    line-height: 1.35;
}

header h1::before,
header h1::after {
    content: "·";
    color: var(--celadon);
    margin: 0 .35em;
    font-weight: 700;
    vertical-align: middle;
}

.subtitle {
    font-size: .98rem;
    color: var(--muted);
    font-style: normal;
    letter-spacing: .02em;
    line-height: 1.9;
}

/* 标题下方的青色短线装饰 */
header::after {
    content: "";
    display: block;
    width: 56px;
    height: 2px;
    margin: 22px auto 0;
    background: var(--celadon);
}

/* ============================ 导航 ============================ */
.nav-bar {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 26px;
}

.nav-btn {
    font-family: var(--sans);
    font-size: .95rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all .25s ease;
    border: none;
    background: transparent;
    color: var(--text);
}

/* 页面级导航：文字 + 下划线激活 */
.page-tabs {
    width: 100%;
    border-bottom: 1px solid var(--line);
    margin-bottom: 30px;
    gap: 4px;
}

.page-tabs .nav-btn {
    padding: 12px 24px;
    position: relative;
    color: var(--muted);
    letter-spacing: .08em;
}

.page-tabs .nav-btn i {
    margin-right: 8px;
    opacity: .85;
    font-size: .9em;
}

.page-tabs .nav-btn:hover {
    color: var(--ink);
}

.page-tabs .nav-btn.active {
    color: var(--ink);
    background: transparent;
    border: none;
    box-shadow: none;
}

.page-tabs .nav-btn.active::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: -1px;
    transform: translateX(-50%);
    width: 58%;
    height: 2px;
    background: var(--celadon);
}

/* 分类筛选：克制的描边 chip */
#categoryNav {
    padding: 4px 0 6px;
    margin-bottom: 26px;
}

#categoryNav .nav-btn {
    padding: 9px 20px;
    border: 1px solid var(--line-2);
    background: var(--card);
    border-radius: var(--radius);
    color: var(--ink-2);
    letter-spacing: .06em;
}

#categoryNav .nav-btn:hover {
    border-color: var(--celadon);
    color: var(--celadon);
    transform: none;
    box-shadow: none;
}

#categoryNav .nav-btn.active {
    background: var(--ink);
    border-color: var(--ink);
    color: #fbf8f0;
    box-shadow: none;
}

/* ============================ 搜索 ============================ */
.search-section {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin-bottom: 34px;
    padding: 0;
    background: transparent;
    border-radius: 0;
    box-shadow: none;
}

#searchInput {
    flex: 1;
    max-width: 440px;
    padding: 11px 18px;
    border: 1px solid var(--line-2);
    background: var(--card);
    border-radius: var(--radius);
    font-size: .95rem;
    color: var(--ink);
    outline: none;
    transition: border-color .2s ease, box-shadow .2s ease;
}

#searchInput::placeholder {
    color: var(--muted);
}

#searchInput:focus {
    border-color: var(--celadon);
    box-shadow: 0 0 0 3px rgba(45, 95, 93, .12);
}

#searchBtn,
#clearBtn {
    padding: 11px 22px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: .95rem;
    font-weight: 500;
    transition: all .25s ease;
    letter-spacing: .08em;
}

#searchBtn {
    background: var(--celadon-d);
    color: #fbf8f0;
    border: 1px solid var(--celadon-d);
}

#searchBtn:hover {
    background: var(--celadon);
    border-color: var(--celadon);
    transform: none;
    box-shadow: 0 4px 14px rgba(45, 95, 93, .22);
}

#clearBtn {
    background: transparent;
    color: var(--muted);
    border: 1px solid var(--line-2);
}

#clearBtn:hover {
    color: var(--ink);
    border-color: var(--line-2);
    background: var(--card);
    transform: none;
    box-shadow: none;
}

/* ============================ 统计卡 ============================ */
.stats-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
    margin-bottom: 36px;
    padding: 0;
}

.stat-card {
    position: relative;
    background: var(--card);
    color: var(--ink);
    padding: 24px 18px 20px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow);
    border: 1px solid var(--line);
    overflow: hidden;
    transition: transform .3s ease, box-shadow .3s ease;
}

.stat-card::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    height: 3px;
    background: var(--celadon);
}

.stat-card:nth-child(1)::before { background: var(--ink); }
.stat-card:nth-child(2)::before { background: var(--c-temple); }
.stat-card:nth-child(3)::before { background: var(--c-heritage); }
.stat-card:nth-child(4)::before { background: var(--c-ancient); }
.stat-card:nth-child(5)::before { background: var(--c-residence); }
.stat-card:nth-child(6)::before { background: var(--c-other); }

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.stat-card h3 {
    font-family: var(--sans);
    font-size: .8rem;
    font-weight: 500;
    letter-spacing: .14em;
    color: var(--muted);
    margin-bottom: 10px;
    opacity: 1;
}

.stat-card span {
    font-family: var(--serif);
    font-size: 2.15rem;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: .02em;
}

/* ============================ 景点卡片 ============================ */
.sites-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
    gap: 24px;
    padding: 0;
}

.site-card {
    background: var(--card);
    padding: 0;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--line);
    transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
    position: relative;
    overflow: hidden;
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

.site-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--line-2);
}

.site-card:active {
    transform: translateY(-1px);
    transition: all .1s ease;
}

/* 封面 */
.card-cover {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: var(--paper-2);
    overflow: hidden;
}

.card-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    display: block;
    transition: transform .6s ease;
}

.site-card:hover .card-cover img {
    transform: scale(1.04);
}

.card-cover-empty {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--muted);
    font-size: .9rem;
    letter-spacing: .12em;
    background: linear-gradient(135deg, var(--paper-2), var(--paper));
}

.card-preview-hint {
    position: absolute;
    left: 12px;
    bottom: 12px;
    background: rgba(31, 36, 33, .74);
    color: #fbf8f0;
    padding: 5px 11px;
    border-radius: 3px;
    font-size: .74rem;
    letter-spacing: .08em;
    opacity: 0;
    transform: translateY(6px);
    transition: opacity .3s ease, transform .3s ease;
    backdrop-filter: blur(6px);
    pointer-events: none;
}

.site-card:hover .card-preview-hint {
    opacity: 1;
    transform: translateY(0);
}

/* 卡片正文 */
.card-body {
    padding: 18px 20px 20px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.site-name {
    font-family: var(--serif);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    letter-spacing: .03em;
    line-height: 1.4;
}

.site-category {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 3px;
    font-family: var(--sans);
    font-size: .72rem;
    font-weight: 500;
    letter-spacing: .1em;
    background: var(--celadon-tint);
    color: var(--celadon-d);
    white-space: nowrap;
    flex-shrink: 0;
}

.site-card.temple    .site-category { background: #e7efea; color: var(--c-temple); }
.site-card.heritage  .site-category { background: #e6edf0; color: var(--c-heritage); }
.site-card.ancient   .site-category { background: #f1e7d8; color: var(--c-ancient); }
.site-card.residence .site-category { background: #f0e4e8; color: var(--c-residence); }
.site-card.other     .site-category { background: #ebe9e4; color: var(--c-other); }

.site-description {
    color: var(--text);
    line-height: 1.85;
    margin-top: 8px;
    text-align: justify;
    font-size: .96rem;
}

.site-meta {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid var(--line);
    font-size: .85rem;
    color: var(--muted);
}

.site-meta i {
    color: var(--celadon);
    margin-right: 6px;
}

.site-period {
    font-weight: 500;
    color: var(--ink-2);
}

.site-keywords {
    margin-top: 10px;
    font-size: .85rem;
    color: var(--muted);
    letter-spacing: .02em;
}

.site-keywords i {
    color: var(--bronze);
    margin-right: 6px;
}

/* 空状态 */
.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 70px 20px;
    color: var(--muted);
}

.empty-state h3 {
    font-family: var(--serif);
    color: var(--ink-2);
    font-weight: 500;
    margin-bottom: 10px;
    letter-spacing: .06em;
}

/* ============================ 页脚 ============================ */
footer {
    text-align: center;
    margin-top: 56px;
    padding: 28px 0 4px;
    border-top: 1px solid var(--line);
    color: var(--muted);
    background: transparent;
    border-radius: 0;
    font-size: .9rem;
    letter-spacing: .06em;
}

footer p {
    margin: 0;
    line-height: 1.9;
}

footer span {
    color: var(--celadon);
}

/* 副信息行（技术支持 / ICP 等） */
.footer-support {
    margin-top: 6px;
    font-size: .8rem;
    opacity: .82;
    letter-spacing: .04em;
}

/* ============================ 响应式 ============================ */
@media (max-width: 768px) {
    .container {
        padding: 24px 16px 48px;
    }

    header h1 {
        font-size: 1.7rem;
    }

    .page-tabs .nav-btn {
        padding: 10px 16px;
        font-size: .9rem;
    }

    #categoryNav .nav-btn {
        padding: 8px 16px;
        font-size: .9rem;
    }

    .search-section {
        flex-direction: column;
        gap: 10px;
    }

    #searchInput {
        max-width: 100%;
    }

    .stats-section {
        grid-template-columns: repeat(2, 1fr);
        gap: 14px;
    }

    .sites-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.45rem;
    }

    .stats-section {
        grid-template-columns: 1fr;
    }

    .stat-card span {
        font-size: 1.8rem;
    }
}