/* ========== 全局变量 ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --bg: #000000;
    --bg-elevated: #0a0a0a;
    --card-bg: #111111;
    --card-hover: #181818;
    --card-border: #222222;
    --input-bg: #111111;
    --input-border: #2a2a2a;
    --text: #ffffff;
    --text-secondary: #b0b0b0;
    --text-tertiary: #666666;
    --accent: #4f8cff;
    --accent-hover: #6ba0ff;
    --accent-glow: rgba(79, 140, 255, 0.3);
    --accent-bg: rgba(79, 140, 255, 0.12);
    --danger: #ff5c5c;
    --danger-bg: rgba(255, 92, 92, 0.1);
    --success: #34d399;
    --radius: 16px;
    --radius-sm: 12px;
    --radius-pill: 999px;
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; -webkit-tap-highlight-color: transparent; }
button { font-family: inherit; -webkit-tap-highlight-color: transparent; }

/* ========== 前台导航页（PC端优化） ========== */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 48px 32px 56px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    text-align: center;
    padding: 32px 0 36px;
}

.site-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: 1px;
    background: linear-gradient(135deg, #ffffff 0%, #a0a0a0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.site-subtitle {
    font-size: 15px;
    color: var(--text-tertiary);
    margin-bottom: 40px;
    letter-spacing: 0.5px;
}

/* 搜索框 - PC端更宽 */
.search-box {
    display: flex;
    align-items: center;
    max-width: 600px;
    margin: 0 auto;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--radius-pill);
    overflow: hidden;
    transition: var(--transition);
    padding: 0 22px;
}

.search-box:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-glow);
    background: #131313;
}

.search-icon {
    width: 20px;
    height: 20px;
    color: var(--text-tertiary);
    flex-shrink: 0;
    margin-right: 12px;
}

.search-box input {
    flex: 1;
    border: none;
    outline: none;
    padding: 16px 0;
    font-size: 16px;
    background: transparent;
    color: var(--text);
}

.search-box input::placeholder {
    color: var(--text-tertiary);
}

/* 分类导航 - PC端更大间距 */
.category-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin: 40px 0 36px;
}

.cat-btn {
    padding: 10px 22px;
    border: 1px solid var(--card-border);
    background: var(--card-bg);
    border-radius: var(--radius-pill);
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.cat-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-bg);
}

.cat-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
    font-weight: 500;
    box-shadow: 0 4px 16px rgba(79, 140, 255, 0.3);
}

/* 网址卡片网格 - PC端更大卡片 */
.link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 18px;
    flex: 1;
}

.link-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    transition: var(--transition);
}

.link-card:hover {
    background: var(--card-hover);
    border-color: rgba(79, 140, 255, 0.4);
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(79, 140, 255, 0.1);
}

.link-icon {
    width: 52px;
    height: 52px;
    min-width: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    background: var(--accent-bg);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(79, 140, 255, 0.15);
}

.link-info {
    flex: 1;
    min-width: 0;
}

.link-name {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.link-desc {
    font-size: 13px;
    color: var(--text-tertiary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.no-result {
    text-align: center;
    padding: 100px 20px;
    color: var(--text-tertiary);
    font-size: 16px;
}

.footer {
    text-align: center;
    margin-top: 56px;
    padding-top: 28px;
    border-top: 1px solid var(--card-border);
}

.admin-link {
    font-size: 13px;
    color: var(--text-tertiary);
    transition: var(--transition);
    letter-spacing: 0.5px;
}

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

/* ========== 登录页 ========== */
.login-body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    padding: 20px;
    position: relative;
    overflow: hidden;
}

.login-body::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 20%, rgba(79, 140, 255, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(120, 80, 255, 0.08) 0%, transparent 50%);
    pointer-events: none;
}

.login-container {
    width: 100%;
    max-width: 400px;
    position: relative;
    z-index: 1;
}

.login-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 24px;
    padding: 48px 36px 36px;
    text-align: center;
}

.login-icon {
    font-size: 48px;
    margin-bottom: 18px;
}

.login-card h2 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 32px;
}

.login-card .form-group {
    margin-bottom: 18px;
}

.login-card input {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid var(--input-border);
    background: var(--input-bg);
    border-radius: var(--radius-sm);
    font-size: 15px;
    color: var(--text);
    outline: none;
    transition: var(--transition);
}

.login-card input::placeholder {
    color: var(--text-tertiary);
}

.login-card input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-glow);
}

.login-tip {
    margin-top: 20px;
    font-size: 12px;
    color: var(--text-tertiary);
}

/* ========== 后台管理页 ========== */
.admin-body {
    background: var(--bg);
    min-height: 100vh;
}

.admin-container {
    max-width: 960px;
    margin: 0 auto;
    padding: 32px 24px 56px;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 28px;
    flex-wrap: wrap;
    gap: 12px;
}

.admin-header h1 {
    font-size: 24px;
    font-weight: 600;
}

.admin-actions {
    display: flex;
    gap: 10px;
}

.alert {
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    font-size: 14px;
    border: 1px solid;
}

.alert-success {
    background: rgba(52, 211, 153, 0.1);
    color: var(--success);
    border-color: rgba(52, 211, 153, 0.2);
}

.alert-error {
    background: var(--danger-bg);
    color: var(--danger);
    border-color: rgba(255, 92, 92, 0.2);
}

.tabs {
    display: flex;
    gap: 6px;
    margin-bottom: 24px;
    background: var(--card-bg);
    padding: 6px;
    border-radius: var(--radius);
    border: 1px solid var(--card-border);
    overflow-x: auto;
}

.tab-btn {
    flex: 1;
    padding: 12px 20px;
    border: none;
    background: transparent;
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    font-weight: 500;
}

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

.tab-btn.active {
    background: var(--accent);
    color: #fff;
}

.tab-content {
    display: none;
}

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

.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 28px;
    margin-bottom: 20px;
}

.card h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
}

.sort-tip {
    font-size: 12px;
    font-weight: 400;
    color: var(--text-tertiary);
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-full {
    grid-column: 1 / -1;
}

.form-group label {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 12px 14px;
    border: 1px solid var(--input-border);
    background: var(--input-bg);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--text);
    outline: none;
    transition: var(--transition);
}

.form-group input::placeholder {
    color: var(--text-tertiary);
}

.form-group input:focus,
.form-group select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23666' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 38px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 11px 22px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
}

.btn-primary:hover {
    background: var(--accent-hover);
    box-shadow: 0 4px 16px rgba(79, 140, 255, 0.3);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--input-border);
    color: var(--text-secondary);
}

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-bg);
}

.btn-danger {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid rgba(255, 92, 92, 0.2);
}

.btn-danger:hover {
    background: rgba(255, 92, 92, 0.2);
}

.btn-sm {
    padding: 7px 16px;
    font-size: 13px;
    border-radius: 8px;
}

.btn-block {
    width: 100%;
    padding: 14px;
    font-size: 15px;
}

.form-group .btn + .btn {
    margin-left: 12px;
}

/* 网址列表（含拖拽） */
.link-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.link-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 18px;
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    background: var(--bg-elevated);
    cursor: grab;
    user-select: none;
}

.link-item:hover {
    border-color: var(--input-border);
}

.link-item.dragging {
    opacity: 0.4;
    border-color: var(--accent);
    background: var(--accent-bg);
}

.link-item.drag-over {
    border-top: 2px solid var(--accent);
}

.drag-handle {
    color: var(--text-tertiary);
    font-size: 18px;
    cursor: grab;
    flex-shrink: 0;
    padding: 4px 2px;
    letter-spacing: -2px;
    transition: var(--transition);
}

.drag-handle:hover {
    color: var(--accent);
}

.link-item-icon {
    width: 44px;
    height: 44px;
    min-width: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    background: var(--accent-bg);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(79, 140, 255, 0.12);
}

.link-item-info {
    flex: 1;
    min-width: 0;
}

.link-item-name {
    font-size: 15px;
    font-weight: 600;
}

.link-item-url {
    font-size: 12px;
    color: var(--accent);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-top: 2px;
}

.link-item-desc {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-top: 3px;
}

.link-item-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.save-order-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 20px;
    padding: 14px 18px;
    background: var(--accent-bg);
    border: 1px solid rgba(79, 140, 255, 0.2);
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--text-secondary);
}

.empty-tip {
    text-align: center;
    color: var(--text-tertiary);
    padding: 28px;
    font-size: 14px;
}

/* 分类列表 */
.category-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.category-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 18px;
    border: 1px solid var(--card-border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    background: var(--bg-elevated);
    transition: var(--transition);
}

.category-item:hover {
    border-color: var(--input-border);
}

.cat-icon {
    font-size: 20px;
}

.cat-name {
    font-weight: 600;
}

.cat-id {
    font-size: 11px;
    color: var(--text-tertiary);
    background: var(--card-bg);
    padding: 4px 10px;
    border-radius: 6px;
    border: 1px solid var(--card-border);
    font-family: monospace;
}

.cat-count {
    flex: 1;
    font-size: 12px;
    color: var(--text-tertiary);
    text-align: right;
}

.help-list {
    list-style: none;
    padding: 0;
}

.help-list li {
    padding: 12px 0;
    font-size: 14px;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--card-border);
}

.help-list li:last-child {
    border-bottom: none;
}

.help-list strong {
    color: var(--text);
    font-weight: 600;
}

/* 滚动条 */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg);
}

::-webkit-scrollbar-thumb {
    background: #2a2a2a;
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: #3a3a3a;
}

/* ========== 响应式（平板及以下） ========== */
@media (max-width: 1024px) {
    .container {
        max-width: 100%;
        padding: 32px 24px 48px;
    }
    .link-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: 14px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 20px 16px 40px;
    }
    .site-title {
        font-size: 26px;
    }
    .site-subtitle {
        margin-bottom: 28px;
    }
    .search-box {
        max-width: 100%;
        padding: 0 18px;
    }
    .search-box input {
        padding: 13px 0;
        font-size: 15px;
    }
    .category-nav {
        margin: 28px 0 24px;
        gap: 8px;
    }
    .cat-btn {
        padding: 8px 16px;
        font-size: 13px;
    }
    .link-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 12px;
    }
    .link-card {
        padding: 16px;
        gap: 12px;
    }
    .link-icon {
        width: 42px;
        height: 42px;
        min-width: 42px;
        font-size: 22px;
    }
    .link-name {
        font-size: 14px;
    }
    .form-grid {
        grid-template-columns: 1fr;
    }
    .admin-header {
        flex-direction: column;
        align-items: flex-start;
    }
    .admin-header h1 {
        font-size: 20px;
    }
    .card {
        padding: 20px;
    }
    .link-item {
        flex-wrap: wrap;
    }
    .link-item-actions {
        width: 100%;
        justify-content: flex-end;
    }
    .category-item {
        flex-wrap: wrap;
    }
    .cat-count {
        text-align: left;
        width: 100%;
    }
    .drag-handle {
        display: none;
    }
    .link-item {
        cursor: default;
    }
}

@media (max-width: 420px) {
    .link-grid {
        grid-template-columns: 1fr 1fr;
    }
    .link-card {
        flex-direction: column;
        text-align: center;
        padding: 18px 12px;
    }
    .link-icon {
        margin-bottom: 6px;
    }
}