/* ============================================================
   瑞幸券转赠系统 - 深色主题 UI
   ============================================================ */

:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --border: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #6366f1;
    --accent-hover: #4f46e5;
    --green: #22c55e;
    --red: #ef4444;
    --orange: #f59e0b;
    --blue: #3b82f6;
    --purple: #8b5cf6;
    --cyan: #06b6d4;
    --radius: 8px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    min-height: 100vh;
    font-size: 14px;
}

/* ===== 登录页 ===== */
body.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 40px 30px;
    text-align: center;
}

.login-logo {
    font-size: 48px;
    margin-bottom: 10px;
}

.login-card h1 {
    font-size: 22px;
    margin-bottom: 6px;
}

.login-subtitle {
    color: var(--text-secondary);
    font-size: 13px;
    margin-bottom: 30px;
}

.login-error {
    color: var(--red);
    margin-top: 12px;
    padding: 8px;
    background: rgba(239,68,68,0.1);
    border-radius: var(--radius);
    font-size: 13px;
}

/* ===== 侧边栏 ===== */
.sidebar {
    width: 220px;
    min-width: 220px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
}

.sidebar-brand {
    padding: 20px 16px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 8px;
}

.brand-icon { font-size: 24px; }
.brand-text { font-size: 16px; font-weight: 700; }

.sidebar-nav {
    flex: 1;
    padding: 8px;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    border-radius: var(--radius);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    margin-bottom: 2px;
    transition: all 0.2s;
}

.nav-item:hover {
    background: rgba(99,102,241,0.1);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--accent);
    color: white;
}

.nav-icon { font-size: 16px; width: 20px; text-align: center; }

.sidebar-footer {
    padding: 12px 8px;
    border-top: 1px solid var(--border);
}

.logout-btn:hover {
    background: rgba(239,68,68,0.15);
    color: var(--red);
}

/* ===== 主区域 ===== */
.main-content {
    margin-left: 220px;
    flex: 1;
    padding: 24px;
    max-width: calc(100vw - 220px);
}

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 12px;
}

.page-header h1 {
    font-size: 22px;
    font-weight: 700;
}

.update-time {
    color: var(--text-muted);
    font-size: 12px;
}

/* ===== 统计卡片 ===== */
.stat-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    border-top: 3px solid transparent;
}

.stat-card.green { border-top-color: var(--green); }
.stat-card.blue { border-top-color: var(--blue); }
.stat-card.purple { border-top-color: var(--purple); }
.stat-card.orange { border-top-color: var(--orange); }
.stat-card.red { border-top-color: var(--red); }
.stat-card.cyan { border-top-color: var(--cyan); }

.stat-value {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 6px;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 13px;
}

/* ===== 表格 ===== */
.table-container {
    overflow-x: auto;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th, .data-table td {
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 13px;
}

.data-table th {
    background: rgba(99,102,241,0.08);
    color: var(--text-secondary);
    font-weight: 600;
    position: sticky;
    top: 0;
}

.data-table tr:hover td {
    background: rgba(99,102,241,0.05);
}

.link-text {
    color: var(--accent);
    text-decoration: none;
}

.link-text:hover {
    text-decoration: underline;
}

.status-success { color: var(--green); }
.status-fail { color: var(--red); }

.badge {
    display: inline-block;
    padding: 2px 8px;
    background: rgba(99,102,241,0.15);
    color: var(--accent);
    border-radius: 12px;
    font-size: 12px;
}

/* ===== 表单 ===== */
.form-group {
    margin-bottom: 12px;
}

.form-row {
    display: flex;
    gap: 10px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.form-input {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px 14px;
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
    width: 100%;
    transition: border-color 0.2s;
}

.form-input:focus {
    border-color: var(--accent);
}

textarea.form-input {
    resize: vertical;
    min-height: 100px;
}

select.form-input {
    cursor: pointer;
}

/* ===== 按钮 ===== */
.btn-primary {
    display: inline-block;
    padding: 10px 20px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: scale(1.02);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    display: inline-block;
    padding: 10px 20px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    cursor: pointer;
}

.btn-full {
    width: 100%;
}

.btn-small {
    padding: 4px 10px;
    font-size: 12px;
    background: rgba(99,102,241,0.15);
    color: var(--accent);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    margin: 2px;
}

.btn-small:hover {
    background: var(--accent);
    color: white;
}

.btn-small.danger {
    background: rgba(239,68,68,0.15);
    color: var(--red);
}

.btn-small.danger:hover {
    background: var(--red);
    color: white;
}

/* ===== 卡片 ===== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
}

.card h3 {
    margin-bottom: 16px;
    font-size: 16px;
}

.section-title {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 12px;
}

/* ===== Tab ===== */
.tabs {
    display: flex;
    gap: 0;
    margin-bottom: 20px;
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
}

.tab-btn {
    padding: 10px 20px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
    border-bottom: 2px solid transparent;
}

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

.tab-btn.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
    background: rgba(99,102,241,0.05);
}

.tab-panel {
    display: none;
}

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

/* ===== 弹窗 ===== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.6);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-content h3, .modal-content h4 {
    margin-bottom: 16px;
}

.modal-content .form-input {
    margin-bottom: 10px;
}

.modal-btns {
    display: flex;
    gap: 10px;
    margin-top: 16px;
}

/* ===== 其他 ===== */
.filter-bar {
    display: flex;
    gap: 10px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.filter-bar .form-input {
    width: auto;
}

.result-area {
    margin-top: 16px;
}

.success-card {
    background: rgba(34,197,94,0.08);
    border: 1px solid rgba(34,197,94,0.2);
    padding: 16px;
    border-radius: 12px;
    margin-top: 10px;
}

.success-card h4 {
    color: var(--green);
    margin-bottom: 10px;
}

.success-card p {
    margin: 4px 0;
    font-size: 13px;
    word-break: break-all;
}

.error-msg {
    background: rgba(239,68,68,0.08);
    border: 1px solid rgba(239,68,68,0.2);
    padding: 12px;
    border-radius: var(--radius);
    color: var(--red);
    margin-top: 10px;
}

.empty-msg {
    color: var(--text-muted);
    text-align: center;
    padding: 20px;
}

.loading {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
}

/* ===== 图表 ===== */
.chart-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.chart-container {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
}

.chart-container h3 {
    margin-bottom: 16px;
    font-size: 16px;
}

@media (max-width: 768px) {
    .sidebar {
        width: 60px;
        min-width: 60px;
    }
    .main-content {
        margin-left: 60px;
        max-width: calc(100vw - 60px);
    }
    .brand-text, .nav-item span:not(.nav-icon) {
        display: none;
    }
    .chart-row {
        grid-template-columns: 1fr;
    }
    .stat-cards {
        grid-template-columns: repeat(2, 1fr);
    }
}