/* ============================================
   GEO监测系统 - 样式表
   ============================================ */

:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #e0e7ff;
    --success: #059669;
    --warning: #d97706;
    --danger: #dc2626;
    --info: #0ea5e9;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --white: #ffffff;
    --shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);
    --shadow-lg: 0 10px 15px rgba(0,0,0,.1), 0 4px 6px rgba(0,0,0,.05);
    --radius: 8px;
    --radius-sm: 4px;
    --radius-lg: 12px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 14px;
    color: var(--gray-800);
    background: var(--gray-50);
    line-height: 1.6;
}

/* ===== 侧边栏 ===== */
.sidebar {
    position: fixed;
    left: 0; top: 0; bottom: 0;
    width: 240px;
    background: var(--gray-900);
    color: var(--white);
    z-index: 100;
    overflow-y: auto;
}
.sidebar-brand {
    padding: 20px;
    border-bottom: 1px solid var(--gray-700);
}
.sidebar-brand h2 {
    font-size: 18px;
    font-weight: 700;
    color: var(--white);
}
.sidebar-brand small {
    color: var(--gray-400);
    font-size: 12px;
}
.sidebar-nav { padding: 12px 0; }
.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    color: var(--gray-300);
    text-decoration: none;
    font-size: 14px;
    transition: all .2s;
    border-left: 3px solid transparent;
}
.sidebar-nav a:hover, .sidebar-nav a.active {
    color: var(--white);
    background: rgba(255,255,255,.1);
    border-left-color: var(--primary);
}
.sidebar-nav a .nav-icon { font-size: 18px; width: 24px; text-align: center; }

/* ===== 主内容区 ===== */
.main-content {
    margin-left: 240px;
    min-height: 100vh;
}

/* ===== 顶栏 ===== */
.topbar {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: 0 24px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.topbar-title h3 { font-size: 16px; font-weight: 600; }
.topbar-user { display: flex; align-items: center; gap: 10px; }
.topbar-user .user-name { color: var(--gray-700); }
.topbar-user .btn { font-size: 12px; }

/* ===== 内容区 ===== */
.content { padding: 24px; }

/* ===== 卡片 ===== */
.card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 16px;
}
.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.card-header h4 { font-size: 15px; font-weight: 600; }
.card-body { padding: 20px; }

/* ===== 统计卡片 ===== */
.stat-cards {
    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: 20px;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary);
}
.stat-card.warning { border-left-color: var(--warning); }
.stat-card.danger { border-left-color: var(--danger); }
.stat-card.success { border-left-color: var(--success); }
.stat-card.info { border-left-color: var(--info); }
.stat-card .stat-value { font-size: 28px; font-weight: 700; color: var(--gray-900); }
.stat-card .stat-label { font-size: 13px; color: var(--gray-500); margin-top: 4px; }

/* ===== 表格 ===== */
.table-wrap { overflow-x: auto; }
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
table th, table td {
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}
table th {
    background: var(--gray-50);
    font-weight: 600;
    color: var(--gray-700);
    white-space: nowrap;
}
table tr:hover { background: var(--gray-50); }

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all .2s;
    white-space: nowrap;
}
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: white; }
.btn-warning { background: var(--warning); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-outline { background: white; color: var(--gray-700); border: 1px solid var(--gray-300); }
.btn-outline:hover { background: var(--gray-50); }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-block { width: 100%; justify-content: center; }

/* ===== 表单 ===== */
.form-group { margin-bottom: 16px; }
.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 6px;
}
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--gray-800);
    transition: border-color .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 var(--primary-light);
}
.form-group textarea { min-height: 80px; resize: vertical; }
.form-row { display: flex; gap: 12px; }
.form-row .form-group { flex: 1; }

/* ===== 标签/徽章 ===== */
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
}
.badge-success { background: #d1fae5; color: #065f46; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-info { background: #dbeafe; color: #1e40af; }
.badge-gray { background: var(--gray-200); color: var(--gray-600); }

/* ===== 弹窗 ===== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,.5);
    z-index: 200;
    align-items: center;
    justify-content: center;
}
.modal-overlay.active { display: flex; }
.modal {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
}
.modal-lg { max-width: 800px; }
.modal-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.modal-header h4 { font-size: 16px; }
.modal-close {
    background: none; border: none;
    font-size: 20px; cursor: pointer;
    color: var(--gray-400);
}
.modal-close:hover { color: var(--gray-700); }
.modal-body { padding: 20px; }
.modal-footer {
    padding: 12px 20px;
    border-top: 1px solid var(--gray-200);
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

/* ===== 登录页 ===== */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}
.login-container { width: 100%; max-width: 400px; padding: 20px; }
.login-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-lg);
}
.login-header { text-align: center; margin-bottom: 30px; }
.login-header h1 { font-size: 24px; color: var(--gray-900); }
.login-header p { color: var(--gray-500); margin-top: 8px; }
.login-footer { text-align: center; margin-top: 20px; color: var(--gray-400); font-size: 12px; }

/* ===== 提醒 ===== */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    font-size: 14px;
}
.alert-error { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }
.alert-success { background: #d1fae5; color: #065f46; border: 1px solid #a7f3d0; }
.alert-info { background: #dbeafe; color: #1e40af; border: 1px solid #bfdbfe; }

/* ===== 进度条 ===== */
.progress-bar {
    height: 8px;
    background: var(--gray-200);
    border-radius: 4px;
    overflow: hidden;
}
.progress-bar .progress-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 4px;
    transition: width .3s;
}
.progress-fill.success { background: var(--success); }
.progress-fill.warning { background: var(--warning); }

/* ===== 图表容器 ===== */
.chart-container {
    width: 100%;
    min-height: 300px;
}
.chart-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* ===== 分页 ===== */
.pagination {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-top: 20px;
    justify-content: center;
}
.pagination a, .pagination span {
    padding: 6px 12px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    color: var(--gray-700);
    text-decoration: none;
    font-size: 13px;
}
.pagination a:hover { background: var(--primary-light); }
.pagination .active { background: var(--primary); color: white; border-color: var(--primary); }

/* ===== 标签页 ===== */
.tabs {
    display: flex;
    gap: 0;
    border-bottom: 2px solid var(--gray-200);
    margin-bottom: 20px;
}
.tab-btn {
    padding: 10px 20px;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 14px;
    color: var(--gray-500);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all .2s;
}
.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    font-weight: 600;
}
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ===== 工具类 ===== */
.flex { display: flex; }
.flex-between { justify-content: space-between; }
.flex-center { align-items: center; }
.gap-2 { gap: 8px; }
.gap-4 { gap: 16px; }
.mb-4 { margin-bottom: 16px; }
.mt-4 { margin-top: 16px; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-sm { font-size: 12px; }
.text-muted { color: var(--gray-500); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .sidebar { width: 60px; overflow: hidden; }
    .sidebar-brand h2, .sidebar-brand small, .sidebar-nav a span { display: none; }
    .main-content { margin-left: 60px; }
    .stat-cards { grid-template-columns: repeat(2, 1fr); }
    .chart-row { grid-template-columns: 1fr; }
}

/* ============================================
   GEO监测系统 - 系统介绍首页 (landing page)
   ============================================ */
.landing-page { background: var(--white); }

/* 顶部导航 */
.landing-nav {
    position: sticky; top: 0; z-index: 100;
    background: rgba(255,255,255,.85);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--gray-200);
}
.landing-nav-inner {
    max-width: 1180px; margin: 0 auto;
    height: 64px; padding: 0 24px;
    display: flex; align-items: center; justify-content: space-between;
}
.landing-logo {
    font-size: 20px; font-weight: 800; color: var(--gray-900);
    text-decoration: none; letter-spacing: .5px;
}
.landing-logo span { color: var(--primary); }
.landing-menu { display: flex; gap: 28px; }
.landing-menu a {
    color: var(--gray-600); text-decoration: none; font-size: 14px;
    transition: color .2s;
}
.landing-menu a:hover { color: var(--primary); }

/* Hero 区 */
.hero {
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 55%, #9333ea 100%);
    color: var(--white);
    padding: 72px 24px;
}
.hero-inner {
    max-width: 1180px; margin: 0 auto;
    display: grid; grid-template-columns: 1.2fr .8fr; gap: 56px;
    align-items: center;
}
.hero-badge {
    display: inline-block; padding: 6px 14px; margin-bottom: 20px;
    background: rgba(255,255,255,.15); border: 1px solid rgba(255,255,255,.25);
    border-radius: 999px; font-size: 12px; letter-spacing: .3px;
}
.hero-text h1 { font-size: 44px; font-weight: 800; line-height: 1.15; }
.hero-sub { margin-top: 18px; font-size: 16px; color: rgba(255,255,255,.85); line-height: 1.8; }
.hero-actions { margin-top: 30px; display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats { margin-top: 42px; display: flex; gap: 44px; }
.hero-stat { display: flex; flex-direction: column; }
.hs-num { font-size: 30px; font-weight: 800; }
.hs-label { font-size: 13px; color: rgba(255,255,255,.75); margin-top: 2px; }

/* 大号按钮 */
.btn-lg { padding: 12px 26px; font-size: 15px; }
.hero-actions .btn-outline { background: rgba(255,255,255,.1); color: #fff; border-color: rgba(255,255,255,.4); }
.hero-actions .btn-outline:hover { background: rgba(255,255,255,.2); }

/* 通用区块 */
.section { max-width: 1180px; margin: 0 auto; padding: 72px 24px; }
.section-alt { background: var(--gray-50); max-width: none; }
.section-alt > .section-head, .section-alt > .platform-grid,
.section-alt > .steps { max-width: 1180px; margin-left: auto; margin-right: auto; }
.section-head { text-align: center; margin-bottom: 44px; }
.section-head h2 { font-size: 28px; font-weight: 700; color: var(--gray-900); }
.section-head p { margin-top: 10px; color: var(--gray-500); font-size: 15px; }

/* 功能卡片 */
.feature-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px;
}
.feature-card {
    background: var(--white); border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg); padding: 28px 24px;
    box-shadow: var(--shadow); transition: transform .2s, box-shadow .2s;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.feature-icon {
    width: 48px; height: 48px; border-radius: 12px;
    background: var(--primary-light); display: flex; align-items: center;
    justify-content: center; font-size: 24px; margin-bottom: 16px;
}
.feature-card h3 { font-size: 17px; font-weight: 600; color: var(--gray-900); margin-bottom: 8px; }
.feature-card p { color: var(--gray-500); font-size: 13.5px; line-height: 1.7; }

/* 平台 chips */
.platform-grid { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; }
.platform-chip {
    padding: 12px 26px; background: var(--white);
    border: 1px solid var(--gray-200); border-radius: 999px;
    font-size: 15px; font-weight: 600; color: var(--gray-700);
    box-shadow: var(--shadow);
}

/* 维度卡片 */
.dim-grid {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
}
.dim-card {
    background: var(--white); border-left: 4px solid var(--primary);
    border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow);
}
.dim-name { font-size: 16px; font-weight: 700; color: var(--gray-900); margin-bottom: 6px; }
.dim-desc { font-size: 13px; color: var(--gray-500); }

/* 流程步骤 */
.steps {
    display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px;
    counter-reset: step;
}
.step { display: flex; flex-direction: column; align-items: flex-start; }
.step-num {
    width: 40px; height: 40px; border-radius: 50%;
    background: var(--primary); color: #fff; font-weight: 700;
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 14px; font-size: 16px;
}
.step-body h4 { font-size: 15px; font-weight: 600; color: var(--gray-900); margin-bottom: 4px; }
.step-body p { font-size: 13px; color: var(--gray-500); }

/* 页脚 */
.landing-footer { background: var(--gray-900); color: var(--gray-300); }
.landing-footer-inner {
    max-width: 1180px; margin: 0 auto; padding: 24px;
    display: flex; align-items: center; justify-content: space-between;
    font-size: 13px;
}

/* 首页登录卡片（复用 .login-card 视觉，置于 hero 中） */
.landing-page .login-card { background: rgba(255,255,255,.98); }

/* 首页响应式 */
@media (max-width: 980px) {
    .hero-inner { grid-template-columns: 1fr; gap: 36px; }
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .dim-grid { grid-template-columns: repeat(2, 1fr); }
    .steps { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
    .landing-menu { display: none; }
    .hero-text h1 { font-size: 32px; }
    .hero-stats { gap: 24px; }
    .feature-grid, .dim-grid, .steps { grid-template-columns: 1fr; }
}