/* ========== 全局样式 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #818cf8;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    --bg: #f3f4f6;
    --card-bg: #ffffff;
    --text: #1f2937;
    --text-light: #6b7280;
    --border: #e5e7eb;
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --radius: 12px;
}

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;
    min-height: 100vh;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

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

a:hover {
    color: var(--primary-dark);
}

/* ========== 头部 ========== */
.site-header {
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    color: white;
    padding: 20px 0;
    box-shadow: var(--shadow-lg);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    font-size: 32px;
}

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

.header-nav a {
    color: rgba(255,255,255,0.9);
    margin-left: 24px;
    font-size: 15px;
    padding: 6px 14px;
    border-radius: 8px;
    transition: all 0.2s;
}

.header-nav a:hover, .header-nav a.active {
    background: rgba(255,255,255,0.2);
    color: white;
}

/* ========== 主内容 ========== */
.main-content {
    padding: 30px 0 60px;
}

/* ========== 标签页 ========== */
.tabs {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    margin-bottom: 40px;
}

.tab-nav {
    display: flex;
    background: #f9fafb;
    border-bottom: 1px solid var(--border);
}

.tab-btn {
    flex: 1;
    padding: 16px 20px;
    border: none;
    background: transparent;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-light);
    cursor: pointer;
    transition: all 0.2s;
    border-bottom: 3px solid transparent;
}

.tab-btn:hover {
    color: var(--primary);
    background: rgba(79,70,229,0.05);
}

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    background: white;
}

.tab-panel {
    display: none;
    padding: 30px;
}

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

/* ========== 卡片 ========== */
.card {
    width: 100%;
}

.card-header h2 {
    font-size: 22px;
    margin-bottom: 8px;
    color: var(--text);
}

.card-header p {
    color: var(--text-light);
    font-size: 14px;
}

.tip-warning {
    background: #fef3c7;
    color: #92400e;
    padding: 12px 16px;
    border-radius: 8px;
    margin-top: 12px;
    font-size: 14px;
    border-left: 4px solid var(--warning);
}

.tip-warning strong {
    color: #78350f;
}

/* ========== 表单 ========== */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text);
    font-size: 14px;
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="password"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.2s;
    background: 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(79,70,229,0.1);
}

.form-hint {
    display: block;
    margin-top: 6px;
    font-size: 12px;
    color: var(--text-light);
}

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

/* ========== 搜索引擎选择 ========== */
.engine-checkboxes {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.engine-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 14px;
    font-weight: 500;
}

.engine-item:hover {
    border-color: var(--primary);
    background: rgba(79,70,229,0.03);
}

.engine-item input {
    cursor: pointer;
}

.engine-baidu { color: #2932e1; }
.engine-sogou { color: #ff6600; }
.engine-360 { color: #00b942; }
.engine-bing { color: #008373; }
.engine-sm { color: #ff6a00; }

/* ========== 按钮 ========== */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn:active {
    transform: translateY(0);
}

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

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

.btn-success {
    background: var(--success);
    color: white;
}

.btn-success:hover {
    background: #059669;
    color: white;
}

.btn-large {
    padding: 14px 32px;
    font-size: 16px;
    width: 100%;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* ========== 统计信息 ========== */
.stats-info {
    background: #f0f9ff;
    border: 1px solid #bae6fd;
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 20px;
}

.stat-row {
    display: flex;
    justify-content: space-between;
    padding: 4px 0;
    font-size: 14px;
}

.stat-row strong {
    color: var(--primary);
}

/* ========== 提交结果 ========== */
.submit-result {
    margin-top: 24px;
    padding: 20px;
    background: #f9fafb;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.submit-result h3 {
    margin-bottom: 12px;
    font-size: 16px;
}

.result-item {
    padding: 10px 14px;
    margin-bottom: 8px;
    border-radius: 6px;
    font-size: 14px;
}

.result-item.success {
    background: #ecfdf5;
    color: #065f46;
    border-left: 3px solid var(--success);
}

.result-item.fail {
    background: #fef2f2;
    color: #991b1b;
    border-left: 3px solid var(--danger);
}

/* ========== 添加网址结果 ========== */
.add-result {
    margin-top: 20px;
    padding: 14px 18px;
    border-radius: 8px;
    font-size: 14px;
}

.add-result.success {
    background: #ecfdf5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.add-result.error {
    background: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

/* ========== 提示框 ========== */
.notice-box {
    margin-top: 24px;
    padding: 20px;
    background: #fffbeb;
    border: 1px solid #fde68a;
    border-radius: 8px;
}

.notice-box h4 {
    margin-bottom: 10px;
    color: #92400e;
}

.notice-box ul {
    padding-left: 20px;
    color: #78350f;
    font-size: 13px;
}

.notice-box li {
    margin-bottom: 6px;
}

/* ========== 功能介绍 ========== */
.features-section {
    margin-top: 40px;
}

.section-title {
    text-align: center;
    font-size: 24px;
    margin-bottom: 30px;
    color: var(--text);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.feature-card {
    background: var(--card-bg);
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: all 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 12px;
}

.feature-card h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

.feature-card p {
    color: var(--text-light);
    font-size: 14px;
}

/* ========== 页脚 ========== */
.site-footer {
    background: #1f2937;
    color: #9ca3af;
    padding: 24px 0;
    text-align: center;
    font-size: 14px;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .header-inner {
        flex-direction: column;
        gap: 12px;
    }

    .header-nav a {
        margin-left: 12px;
    }

    .logo h1 {
        font-size: 18px;
    }

    .tab-btn {
        padding: 12px 10px;
        font-size: 14px;
    }

    .tab-panel {
        padding: 20px 16px;
    }

    .engine-checkboxes {
        gap: 8px;
    }

    .engine-item {
        padding: 8px 12px;
        font-size: 13px;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .btn-large {
        padding: 12px 24px;
        font-size: 15px;
    }
}

@media (max-width: 480px) {
    .tab-nav {
        flex-direction: column;
    }

    .tab-btn {
        border-bottom: none;
        border-right: 3px solid transparent;
    }

    .tab-btn.active {
        border-right-color: var(--primary);
        border-bottom-color: transparent;
    }
}