/* ============================================================
   SalumniAI (思朗尼引擎) - 管理后台样式
   ============================================================ */

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #eff6ff;
    --text: #333;
    --text-light: #888;
    --border: #e5e7eb;
    --bg: #f5f6f8;
    --white: #fff;
    --danger: #dc3545;
    --danger-light: #fff0f0;
    --success: #28a745;
    --success-light: #e6f9ed;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    font-size: 14px;
}

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

/* ============================================================
   Admin Layout
   ============================================================ */
.admin-layout {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 240px;
    background: linear-gradient(180deg, #1e3a8a 0%, #2563eb 50%, #1d4ed8 100%);
    color: #fff;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
}

.sidebar-header {
    padding: 28px 24px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header h2 {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.sidebar-header p {
    font-size: 12px;
    opacity: 0.7;
    margin-top: 2px;
}

.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    border-radius: 8px;
    color: rgba(255,255,255,0.75);
    font-size: 14px;
    transition: all 0.2s;
    margin-bottom: 2px;
}

.nav-item:hover {
    background: rgba(255,255,255,0.1);
    color: #fff;
}

.nav-item.active {
    background: rgba(255,255,255,0.15);
    color: #fff;
    font-weight: 600;
}

.nav-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.nav-icon svg {
    width: 18px;
    height: 18px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.sidebar-footer {
    padding: 16px 24px;
    border-top: 1px solid rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 13px;
}

.user-info {
    opacity: 0.8;
}

.logout-btn {
    color: rgba(255,255,255,0.7);
    font-size: 13px;
    padding: 4px 10px;
    border-radius: 4px;
    transition: all 0.2s;
}

.logout-btn:hover {
    background: rgba(255,255,255,0.1);
    color: #fff;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 240px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.content-header {
    background: var(--white);
    padding: 20px 32px;
    border-bottom: 1px solid var(--border);
}

.content-header h1 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text);
}

.content-body {
    padding: 24px 32px;
    flex: 1;
}

/* ============================================================
   Stats Grid
   ============================================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    text-align: center;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    font-size: 13px;
    color: var(--text-light);
    margin-top: 4px;
}

/* ============================================================
   Panel
   ============================================================ */
.panel {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    margin-bottom: 20px;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
}

.panel-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.panel-body {
    padding: 20px 24px;
}

/* ============================================================
   Data Table
   ============================================================ */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    text-align: left;
    padding: 12px 12px;
    font-weight: 600;
    font-size: 13px;
    color: var(--text-light);
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}

.data-table td {
    padding: 12px 12px;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
    vertical-align: middle;
}

.data-table tr:hover {
    background: var(--bg);
}

.data-table .empty {
    text-align: center;
    color: var(--text-light);
    padding: 40px 20px;
    font-size: 14px;
}

.data-table .prompt-preview {
    max-width: 250px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.data-table code {
    background: #f0f0f0;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 13px;
    word-break: break-all;
}

.data-table .key-code {
    font-size: 12px;
    max-width: 300px;
    display: inline-block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    vertical-align: middle;
}

.actions {
    white-space: nowrap;
}

.actions .btn {
    margin-right: 4px;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
    line-height: 1.4;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
}

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

.btn-outline:hover {
    background: var(--primary-light);
}

.btn-danger {
    background: transparent;
    color: var(--danger);
    border: 1px solid var(--danger);
}

.btn-danger:hover {
    background: var(--danger-light);
}

.btn-sm {
    padding: 5px 12px;
    font-size: 13px;
}

/* ============================================================
   Badges
   ============================================================ */
.badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success {
    background: var(--success-light);
    color: var(--success);
}

.badge-error {
    background: var(--danger-light);
    color: var(--danger);
}

/* ============================================================
   Forms
   ============================================================ */
.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    font-size: 14px;
    color: var(--text);
}

.form-group .required {
    color: var(--danger);
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="number"],
.form-group input[type="url"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.2s;
    background: var(--white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    resize: vertical;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

.form-group select {
    cursor: pointer;
}

.form-group small {
    display: block;
    margin-top: 4px;
    font-size: 12px;
    color: var(--text-light);
}

/* ============================================================
   Alert
   ============================================================ */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    font-size: 14px;
}

.alert-success {
    background: var(--success-light);
    color: var(--success);
    border: 1px solid #c3e6cb;
}

/* ============================================================
   Modal
   ============================================================ */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
}

.modal-content {
    position: relative;
    background: var(--white);
    border-radius: 12px;
    width: 600px;
    max-width: 95vw;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
    z-index: 1;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-light);
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text);
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 16px 24px;
    border-top: 1px solid var(--border);
}

/* ============================================================
   Code Block
   ============================================================ */
.code-block {
    background: #1e293b;
    color: #e2e8f0;
    padding: 16px 20px;
    border-radius: var(--radius);
    font-size: 13px;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    overflow-x: auto;
    line-height: 1.7;
    margin: 12px 0;
}

.code-block code {
    background: none;
    padding: 0;
}

/* ============================================================
   Feature icon SVGs (front page)
   ============================================================ */
.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(255,255,255,0.15);
    margin-bottom: 16px;
}

.feature-icon svg {
    width: 24px;
    height: 24px;
    fill: none;
    stroke: #fff;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 768px) {
    .sidebar {
        width: 200px;
    }
    .main-content {
        margin-left: 200px;
    }
    .content-body {
        padding: 16px;
    }
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}