:root {
    /* 与后台 admin.css 保持一致，形成统一纸感视觉语言 */
    --app-brand:        #2f6fed;
    --app-brand-soft:   #eaf1fe;
    --app-bg:           #f6f7f8;
    --app-panel:        #ffffff;
    --app-text:         #1f2733;
    --app-muted:        #66707d;
    --app-border:       #e5e8ec;
    --app-border-strong:#d7dce2;
    --app-radius:       10px;
    --shadow-paper:     0 1px 2px rgba(16, 24, 40, .06);
}

body {
    font-family: -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
    background-color: var(--app-bg);
    color: var(--app-text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
}

/* ---------- 顶部：纸感极简 header（去渐变 / 去超大 hero） ---------- */
.header {
    background: var(--app-panel);
    border-bottom: 1px solid var(--app-border);
    padding: 2.5rem 0 2rem;
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
    text-align: center;
}

.header .site-name {
    font-size: 1.9rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin: 0 0 .35rem;
    color: var(--app-text);
}
.header .site-name i {
    color: var(--app-brand);
    margin-right: .35rem;
}
.header .site-lead {
    color: var(--app-muted);
    font-size: 1.02rem;
    margin: 0;
    font-weight: 400;
}
.header .admin-link {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    margin-top: 1rem;
    padding: .45rem 1rem;
    font-size: .85rem;
    color: var(--app-muted);
    background: transparent;
    border: 1px solid var(--app-border-strong);
    border-radius: 999px;
    text-decoration: none;
    transition: color .15s ease, border-color .15s ease, background .15s ease;
}
.header .admin-link:hover {
    color: var(--app-brand);
    border-color: var(--app-brand);
    background: var(--app-brand-soft);
}

/* ---------- 主内容容器 ---------- */
main { flex: 1; }

/* 纸感卡片：细边框 + 轻量阴影，代替原来紫色悬浮阴影卡片 */
.paper-card {
    background: var(--app-panel);
    border: 1px solid var(--app-border);
    border-radius: var(--app-radius);
    box-shadow: var(--shadow-paper);
    padding: 1.5rem 1.5rem 1.75rem;
    margin-bottom: 1.75rem;
}

/* ---------- 统计卡：轻数据板，不用彩色/阴影堆砌 ---------- */
.stat-card {
    background: var(--app-panel);
    border: 1px solid var(--app-border);
    border-radius: var(--app-radius);
    box-shadow: var(--shadow-paper);
    padding: 1.25rem 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    height: 100%;
    transition: border-color .15s ease, box-shadow .15s ease;
}
.stat-card:hover {
    border-color: var(--app-border-strong);
    box-shadow: 0 2px 8px rgba(16, 24, 40, .08);
}
.stat-label {
    font-size: .8rem;
    letter-spacing: .02em;
    color: var(--app-muted);
    margin: 0 0 .35rem;
    text-transform: none;
}
.stat-value {
    font-size: 1.9rem;
    font-weight: 700;
    color: var(--app-text);
    line-height: 1.1;
    font-variant-numeric: tabular-nums;
}
.stat-value a { color: var(--app-brand); text-decoration: none; }

/* ---------- 区块标题：细下划线，不用紫色粗条 ---------- */
.section-title {
    position: relative;
    font-size: 1.15rem;
    font-weight: 650;
    padding-bottom: .6rem;
    margin-bottom: 1.25rem;
    color: var(--app-text);
}
.section-title i { color: var(--app-brand); }
.section-title::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--app-brand);
    border-radius: 2px;
}

/* ---------- 卡片内小标题 ---------- */
.card h5 {
    font-size: .98rem;
    font-weight: 600;
    color: var(--app-text);
}
.card h5 i,
.mode-card h5 i { color: var(--app-brand); }

/* ---------- 图片访问模式卡（纸感细边框，替代平铺 bg-light） ---------- */
.mode-card {
    background: var(--app-bg);
    border: 1px solid var(--app-border);
    border-radius: var(--app-radius);
    padding: 1rem 1.15rem;
    height: 100%;
}
.mode-card h5 {
    font-size: .98rem;
    font-weight: 600;
    color: var(--app-text);
    margin: 0 0 .3rem;
}
.mode-card p { margin: 0; color: var(--app-muted); font-size: .9rem; }

/* ---------- API 链接 + 复制按钮 ---------- */
.api-link-container {
    position: relative;
    overflow: hidden;
    cursor: pointer;
}
.api-link {
    padding: .6rem .9rem;
    background: var(--app-bg);
    border: 1px solid var(--app-border);
    border-radius: var(--app-radius);
    display: flex;
    align-items: center;
    min-height: 46px;
}
.api-link code {
    flex-grow: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-right: 64px;
    color: var(--app-text);
    font-size: .86rem;
}
.copy-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    display: inline-flex;
    align-items: center;
    gap: .3rem;
    background: var(--app-panel);
    color: var(--app-brand);
    border: 1px solid var(--app-border-strong);
    border-radius: 6px;
    padding: .3rem .7rem;
    font-size: .8rem;
    cursor: pointer;
    transition: background .15s ease, border-color .15s ease, color .15s ease;
    z-index: 1;
}
.copy-btn:hover {
    background: var(--app-brand-soft);
    border-color: var(--app-brand);
}

/* 示例点击框 */
.example-container {
    width: 100%;
    height: 180px;
    border-radius: var(--app-radius);
    margin-bottom: 1rem;
    background: var(--app-bg);
    border: 1px dashed var(--app-border-strong);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color .2s ease, background .2s ease;
}
.example-container:hover {
    border-color: var(--app-brand);
    background: var(--app-brand-soft);
}
.example-link {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    color: var(--app-brand);
    text-decoration: none;
    font-weight: 500;
}
.example-link:hover { text-decoration: underline; }

/* ---------- 参数表格 ---------- */
.table { color: var(--app-text); }
.table thead th {
    font-weight: 600;
    color: var(--app-muted);
    font-size: .85rem;
    border-bottom: 1px solid var(--app-border-strong);
    text-transform: none;
    letter-spacing: .01em;
}
.table tbody td { border-color: var(--app-border); font-size: .92rem; }
.table-striped tbody tr:nth-of-type(odd) { background: var(--app-bg); }

/* ---------- 手风琴 ---------- */
.accordion-button {
    background: transparent;
    color: var(--app-text);
    font-weight: 500;
    box-shadow: none !important;
    border: none;
    padding: .9rem 0;
}
.accordion-button:not(.collapsed) {
    color: var(--app-brand);
    background: transparent;
}
.accordion-button::after {
    filter: none;
}
.accordion-item {
    border: none;
    border-bottom: 1px solid var(--app-border);
    background: transparent;
}
.accordion-body {
    padding: .25rem 0 1.25rem;
}

/* ---------- 代码块 ---------- */
pre.bg-light {
    background: var(--app-bg) !important;
    border: 1px solid var(--app-border);
    border-radius: var(--app-radius);
    font-size: .86rem;
}

/* ---------- Toast 复制提示 ---------- */
.toast-notification {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--app-text);
    color: #fff;
    padding: .6rem 1rem;
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(16, 24, 40, .16);
    display: flex;
    align-items: center;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity .25s ease, transform .25s ease;
    z-index: 1000;
    pointer-events: none;
    font-size: .9rem;
}
.toast-notification i {
    color: #4ade80;
    margin-right: .5rem;
}
.toast-notification.show {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- 页脚 ---------- */
footer {
    border-top: 1px solid var(--app-border);
    background: var(--app-panel);
    padding: 1.5rem 0;
    margin-top: 2rem;
    color: var(--app-muted);
    font-size: .88rem;
}
footer a { color: var(--app-muted); text-decoration: none; }
footer a:hover { color: var(--app-brand); }

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
    .header { padding: 1.75rem 0 1.4rem; }
    .header .site-name { font-size: 1.55rem; }
    .stat-value { font-size: 1.5rem; }
    .paper-card { padding: 1.1rem 1rem 1.25rem; }
}