/* ==========================================
   SEMrush Lite - Premium Dark Glassmorphism CSS
   ========================================== */

/* 变量定义 */
:root {
    --bg-main: #0B0F19;
    --bg-card: rgba(22, 30, 49, 0.6);
    --bg-card-hover: rgba(30, 41, 67, 0.8);
    --border-glass: rgba(255, 255, 255, 0.06);
    --border-focus: rgba(59, 130, 246, 0.6);
    
    --color-text-main: #E2E8F0;
    --color-text-muted: #94A3B8;
    --color-text-bright: #FFFFFF;
    
    --primary: #3B82F6;
    --primary-hover: #2563EB;
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
    --accent: #8B5CF6;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --transition-fast: all 0.2s ease-in-out;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 全局重置与基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-main);
    background-image: 
        radial-gradient(at 10% 20%, rgba(59, 130, 246, 0.1) 0px, transparent 50%),
        radial-gradient(at 90% 80%, rgba(139, 92, 246, 0.08) 0px, transparent 50%);
    color: var(--color-text-main);
    font-family: var(--font-sans);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.5;
}

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

a:hover {
    color: #60A5FA;
    text-decoration: underline;
}

/* 滚动条定制 */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.01);
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* 布局结构 */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* 侧边栏 (Sidebar) */
.sidebar {
    width: 260px;
    background: rgba(11, 15, 25, 0.95);
    border-right: 1px solid var(--border-glass);
    padding: 24px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: fixed;
    height: 100vh;
    z-index: 100;
}

.brand {
    display: flex;
    align-center: center;
    gap: 12px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-glass);
}

.logo-icon {
    color: var(--primary);
    stroke-width: 2.5px;
    filter: drop-shadow(0 0 8px rgba(59,130,246,0.6));
}

.brand h2 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-text-bright);
    letter-spacing: -0.5px;
}

.brand h2 span {
    color: var(--primary);
}

.nav-menu {
    margin-top: 30px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
}

.nav-item {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    text-align: left;
    transition: var(--transition-fast);
}

.nav-item i {
    width: 18px;
    height: 18px;
}

.nav-item:hover {
    color: var(--color-text-bright);
    background: rgba(255, 255, 255, 0.03);
}

.nav-item.active {
    color: var(--color-text-bright);
    background: rgba(59, 130, 246, 0.15);
    border-left: 3px solid var(--primary);
    border-radius: 0 8px 8px 0;
    padding-left: 13px;
}

.sidebar-footer {
    padding-top: 16px;
    border-top: 1px solid var(--border-glass);
}

.auth-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    padding: 8px 12px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-glass);
}

.auth-badge .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.auth-badge.online {
    color: var(--success);
}
.auth-badge.online .dot {
    background-color: var(--success);
    box-shadow: 0 0 8px var(--success);
}

.auth-badge.offline {
    color: var(--color-text-muted);
}
.auth-badge.offline .dot {
    background-color: var(--color-text-muted);
}

/* 主内容区 */
.main-content {
    flex: 1;
    margin-left: 260px;
    padding: 32px;
    min-height: 100vh;
}

/* 顶部状态栏 */
.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.top-bar h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-bright);
    letter-spacing: -0.5px;
}

.api-indicators {
    display: flex;
    gap: 10px;
}

.api-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    font-weight: 500;
    padding: 4px 10px;
    border-radius: 12px;
}

.api-badge.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

/* 卡片 & 面板 (Card & Glassmorphism) */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-glass);
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    transition: var(--transition-smooth);
}

.card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(255, 255, 255, 0.1);
}

.card-header {
    margin-bottom: 20px;
}

.card-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text-bright);
    margin-bottom: 4px;
}

.card-header p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* 表单与输入框 */
.form-row {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.flex-1 { flex: 1; }
.flex-2 { flex: 2; }
.flex-3 { flex: 3; }
.flex-row { display: flex; }
.flex-column { display: flex; flex-direction: column; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.align-self-end { align-self: flex-end; }
.gap-20 { gap: 20px; }
.w-full { width: 100%; }
.mt-10 { margin-top: 10px; }
.mt-20 { margin-top: 20px; }

label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
}

input[type="text"], select, textarea {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-glass);
    border-radius: 8px;
    padding: 10px 14px;
    color: var(--color-text-bright);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    transition: var(--transition-fast);
    outline: none;
    width: 100%;
}

input[type="text"]:focus, select:focus, textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
    background: rgba(0, 0, 0, 0.35);
}

/* 下拉框美化 */
.select-wrapper {
    position: relative;
}

.select-wrapper::after {
    content: "▼";
    font-size: 0.6rem;
    color: var(--color-text-muted);
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
}

select {
    appearance: none;
    padding-right: 32px;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    border: none;
    text-decoration: none !none;
}

.btn-primary {
    background: var(--primary);
    color: var(--color-text-bright);
}

.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 0 12px rgba(59, 130, 246, 0.4);
    color: var(--color-text-bright);
    text-decoration: none;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--color-text-main);
    border: 1px solid var(--border-glass);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-text-bright);
    text-decoration: none;
}

.btn-large {
    padding: 12px 24px;
    font-size: 1rem;
}

.btn-small {
    padding: 6px 12px;
    font-size: 0.8rem;
    border-radius: 6px;
}

/* Tab 面板控制 */
.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
    animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 空状态 (Empty State) */
.empty-state {
    text-align: center;
    padding: 60px 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

.large-icon {
    width: 48px;
    height: 48px;
    color: var(--color-text-muted);
}

.empty-state h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-bright);
}

.empty-state p {
    color: var(--color-text-muted);
    max-width: 400px;
    margin-bottom: 10px;
}

/* 指标网格 (Metrics Grid) */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-top: 16px;
}

.metric-card {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.metric-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    font-weight: 600;
}

.metric-card h3 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-text-bright);
    letter-spacing: -1px;
}

.metric-trend {
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
}

.metric-trend.up { color: var(--success); }
.metric-trend.down { color: var(--danger); }
.metric-trend i { width: 12px; height: 12px; }

/* 图表卡片 */
.chart-card {
    margin-top: 20px;
}

.chart-container {
    position: relative;
    height: 320px;
    width: 100%;
}

/* 分割布局与表格 */
.data-split-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 20px;
}

@media (max-width: 1024px) {
    .data-split-grid {
        grid-template-columns: 1fr;
    }
}

.table-card {
    display: flex;
    flex-direction: column;
}

.table-wrapper {
    overflow-x: auto;
    max-height: 400px;
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.85rem;
}

th {
    color: var(--color-text-muted);
    font-weight: 600;
    padding: 12px;
    border-bottom: 1px solid var(--border-glass);
}

td {
    padding: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.02);
    color: var(--color-text-main);
    max-width: 250px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

tr:hover td {
    background: rgba(255, 255, 255, 0.01);
}

.text-right { text-align: right; }
.text-center { text-align: center; }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }

/* 加载动画 */
.loader-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 40px;
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: 12px;
    margin-top: 20px;
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid rgba(59, 130, 246, 0.1);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s infinite linear;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 排名结果特色样式 */
.rank-hero-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 20px;
}

@media (max-width: 768px) {
    .rank-hero-grid {
        grid-template-columns: 1fr;
    }
}

.rank-hero-card {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.rank-hero-card h2 {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--success);
    margin: 8px 0;
    text-shadow: 0 0 20px rgba(16, 185, 129, 0.3);
}

.spec-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 10px;
    font-size: 0.9rem;
}

.spec-list li {
    display: flex;
    justify-content: space-between;
    border-bottom: 1px solid rgba(255,255,255,0.02);
    padding-bottom: 8px;
}

.spec-list strong {
    color: var(--color-text-muted);
}

/* 徽章样式 */
.badge {
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
}

.badge-ads {
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge-info {
    background: rgba(59, 130, 246, 0.15);
    color: var(--primary);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.badge-success {
    background: rgba(16, 185, 129, 0.15);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge-purple {
    background: rgba(139, 92, 246, 0.15);
    color: var(--accent);
    border: 1px solid rgba(139, 92, 246, 0.3);
}

/* SERP 自然列表 */
.serp-organic-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.serp-item {
    border-bottom: 1px solid rgba(255,255,255,0.02);
    padding-bottom: 12px;
}

.serp-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.serp-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 4px;
}

.serp-pos {
    width: 22px;
    height: 22px;
    background: rgba(255,255,255,0.05);
    color: var(--color-text-muted);
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.serp-item.highlighted {
    background: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.3);
    border-radius: 8px;
    padding: 12px;
}

.serp-item.highlighted .serp-pos {
    background: var(--success);
    color: var(--color-text-bright);
}

.serp-title {
    font-size: 0.95rem;
    font-weight: 600;
}

.serp-link {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    word-break: break-all;
}

.serp-desc {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: 4px;
}

/* 广告列表 */
.ads-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.ad-item {
    border-bottom: 1px solid rgba(255,255,255,0.02);
    padding-bottom: 12px;
}

.ad-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: #93C5FD;
}

.ad-link {
    font-size: 0.75rem;
    color: var(--warning);
}

.ad-desc {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: 4px;
}

/* 折叠卡与云标签 */
.paa-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.paa-item {
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--border-glass);
    border-radius: 6px;
    padding: 10px 12px;
    font-size: 0.8rem;
}

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glass);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    color: var(--color-text-main);
    transition: var(--transition-fast);
}

.tag:hover {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--primary);
    color: var(--color-text-bright);
}

/* Markdown 文档展示 */
.markdown-body {
    font-size: 0.9rem;
    color: var(--color-text-main);
    line-height: 1.6;
}

.markdown-body h1, .markdown-body h2, .markdown-body h3 {
    color: var(--color-text-bright);
    margin-top: 18px;
    margin-bottom: 10px;
    font-weight: 600;
}

.markdown-body h1 { font-size: 1.3rem; border-bottom: 1px solid var(--border-glass); padding-bottom: 6px; }
.markdown-body h2 { font-size: 1.1rem; }
.markdown-body h3 { font-size: 0.95rem; }

.markdown-body ul, .markdown-body ol {
    margin-left: 20px;
    margin-bottom: 14px;
}

.markdown-body li {
    margin-bottom: 6px;
}

.markdown-body code {
    background: rgba(255,255,255,0.08);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.8rem;
}

/* 元标签对比组件 */
.meta-compare-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

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

@media (max-width: 768px) {
    .meta-compare-grid {
        grid-template-columns: 1fr;
    }
}

.preview-item label {
    margin-bottom: 4px;
}

.preview-box {
    background: rgba(0,0,0,0.25);
    border: 1px solid;
    padding: 12px;
    border-radius: 8px;
    font-size: 0.85rem;
    min-height: 48px;
    word-break: break-all;
}

.border-warning { border-color: rgba(245, 158, 11, 0.3); }
.border-success { border-color: rgba(16, 185, 129, 0.3); }

.explanation-box {
    background: rgba(255, 255, 255, 0.01);
    border-left: 4px solid var(--primary);
    padding: 16px;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ==========================================
   Keyword Checker & SEO Audit Custom Styles
   ========================================== */

.gauge-wrapper {
    position: relative;
    width: 100px;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.audit-overall-score .gauge-wrapper {
    width: 120px;
    height: 120px;
}

.gauge-value {
    position: absolute;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-bright);
}

.country-row {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.85rem;
    margin-bottom: 8px;
    width: 100%;
}
.country-name {
    width: 120px;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}
.progress-bar-bg {
    flex: 1;
    height: 6px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 3px;
    overflow: hidden;
}
.progress-bar-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 3px;
    width: 0;
    transition: width 0.6s ease-in-out;
}
.country-value {
    width: 60px;
    text-align: right;
    font-weight: 600;
    color: var(--color-text-main);
}

.audit-dashboard {
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.audit-overview-card {
    display: grid;
    grid-template-columns: 180px 1fr 200px;
    gap: 30px;
    align-items: center;
}
@media (max-width: 900px) {
    .audit-overview-card {
        grid-template-columns: 1fr;
        text-align: center;
        justify-items: center;
    }
}
.audit-overall-score {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
.audit-categories {
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 100%;
}
.audit-category-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.9rem;
}
.audit-category-label {
    width: 120px;
    color: var(--color-text-muted);
}
.audit-category-bar {
    flex: 1;
    height: 8px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
    margin: 0 15px;
    overflow: hidden;
}
.audit-category-fill {
    height: 100%;
    border-radius: 4px;
    width: 0%;
    transition: width 0.6s ease;
}
.fill-primary { background: var(--primary); }
.fill-success { background: var(--success); }
.fill-warning { background: var(--warning); }
.fill-accent { background: var(--accent); }

.audit-category-score {
    width: 40px;
    text-align: right;
    font-weight: 600;
}

.audit-screenshot-box {
    width: 100%;
    height: 120px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px dashed var(--border-glass);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    font-size: 0.8rem;
    text-align: center;
    padding: 10px;
}

.badge-status {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.status-success {
    background: rgba(16, 185, 129, 0.15);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.2);
}
.status-warning {
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning);
    border: 1px solid rgba(245, 158, 11, 0.2);
}
.status-error {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}