/* ============================================
   装修不踩坑 - 全站样式
   ============================================ */

/* --- CSS Variables --- */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --accent: #f59e0b;
    --accent-light: #fef3c7;
    --success: #10b981;
    --success-light: #d1fae5;
    --warning: #ef4444;
    --warning-light: #fee2e2;
    --info: #6366f1;
    --info-light: #e0e7ff;
    --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;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px 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);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
    --transition: all 0.3s ease;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--gray-800);
    line-height: 1.7;
    background: var(--gray-50);
    -webkit-font-smoothing: antialiased;
}

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

img { max-width: 100%; height: auto; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }

.text-center { text-align: center; }

/* --- Navbar --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--gray-200);
    transition: var(--transition);
}

.navbar.scrolled { box-shadow: var(--shadow-md); }

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--gray-900);
}

.nav-logo:hover { color: var(--primary); }

.logo-icon { font-size: 1.5rem; }

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.25rem;
}

.nav-link {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    color: var(--gray-600);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
}

.nav-link:hover { color: var(--primary); background: var(--primary-light); }
.nav-link.active { color: var(--primary); background: var(--primary-light); font-weight: 600; }

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    border-radius: 2px;
    transition: var(--transition);
}

/* --- Hero --- */
.hero {
    position: relative;
    min-height: 520px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 1.5rem 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    z-index: 0;
}

.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.06'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: #fff;
    max-width: 700px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
    text-shadow: 0 2px 10px rgba(0,0,0,0.15);
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 0.75rem;
    opacity: 0.95;
}

.hero-desc {
    font-size: 1.1rem;
    opacity: 0.85;
    margin-bottom: 2rem;
}

.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.75rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: var(--primary-light);
    color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border-color: rgba(255,255,255,0.5);
}

.btn-outline:hover {
    background: rgba(255,255,255,0.15);
    border-color: #fff;
    color: #fff;
    transform: translateY(-2px);
}

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

.btn-solid:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* --- Section Headers --- */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--gray-500);
}

/* --- Features Section --- */
.features {
    padding: 5rem 0;
    background: #fff;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.feature-card {
    display: block;
    padding: 2rem;
    background: var(--gray-50);
    border-radius: var(--radius);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--gray-200);
    color: var(--gray-800);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
    color: var(--gray-800);
}

.feature-icon { font-size: 2.5rem; margin-bottom: 1rem; }

.feature-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--gray-900);
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--gray-500);
    line-height: 1.6;
}

/* --- Overview / Timeline Mini --- */
.overview {
    padding: 5rem 0;
    background: var(--gray-50);
}

.timeline-mini {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 1rem;
}

.timeline-item-mini {
    text-align: center;
    padding: 1.5rem 1rem;
    background: #fff;
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

.timeline-item-mini:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.timeline-number {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    font-weight: 700;
    font-size: 1.1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.75rem;
}

.timeline-item-mini h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    color: var(--gray-900);
}

.timeline-item-mini p {
    font-size: 0.85rem;
    color: var(--gray-500);
}

/* --- Tips Preview --- */
.tips-preview {
    padding: 5rem 0;
    background: #fff;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.tip-card {
    padding: 1.5rem;
    border-radius: var(--radius);
    border-left: 4px solid;
    transition: var(--transition);
}

.tip-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

.tip-badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.tip-warning {
    background: var(--warning-light);
    border-color: var(--warning);
}

.tip-warning .tip-badge { background: var(--warning); color: #fff; }

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

.tip-success .tip-badge { background: var(--success); color: #fff; }

.tip-info {
    background: var(--info-light);
    border-color: var(--info);
}

.tip-info .tip-badge { background: var(--info); color: #fff; }

.tip-card h4 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--gray-900);
}

.tip-card p {
    font-size: 0.9rem;
    color: var(--gray-700);
    line-height: 1.6;
}

/* --- Footer --- */
.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    gap: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--gray-700);
}

.footer-info h3 { color: #fff; font-size: 1.3rem; margin-bottom: 0.5rem; }
.footer-info p { color: var(--gray-400); }

.footer-links h4 { color: #fff; font-size: 1rem; margin-bottom: 0.75rem; }
.footer-links ul { list-style: none; }
.footer-links li { margin-bottom: 0.4rem; }
.footer-links a { color: var(--gray-400); font-size: 0.9rem; }
.footer-links a:hover { color: #fff; }

.footer-bottom {
    padding-top: 1.5rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--gray-500);
}

/* ============================================
   Page Layout (子页面通用)
   ============================================ */
.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 100px 1.5rem 60px;
    text-align: center;
    color: #fff;
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.page-header p {
    font-size: 1.1rem;
    opacity: 0.85;
}

.page-content {
    padding: 3rem 0;
}

/* --- 装修流程 Timeline --- */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(to bottom, var(--primary), var(--info));
    border-radius: 3px;
}

.timeline-item {
    position: relative;
    padding-left: 75px;
    padding-bottom: 3rem;
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-dot {
    position: absolute;
    left: 18px;
    top: 4px;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea, #764ba2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    font-size: 0.75rem;
    box-shadow: 0 0 0 4px #fff, 0 0 0 6px var(--primary-light);
}

.timeline-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 1.75rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

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

.timeline-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.timeline-card .timeline-meta {
    font-size: 0.85rem;
    color: var(--gray-400);
    margin-bottom: 1rem;
}

.timeline-card .step-list {
    list-style: none;
    padding: 0;
}

.timeline-card .step-list li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    color: var(--gray-700);
}

.timeline-card .step-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: 700;
}

.timeline-card .brand-tag {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 500;
    margin: 0.15rem;
}

.timeline-card .note-box {
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    background: var(--accent-light);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: var(--gray-700);
    border-left: 3px solid var(--accent);
}

/* --- 重点关注 Table & Cards --- */
.focus-stage {
    margin-bottom: 3rem;
}

.focus-stage-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.focus-stage-number {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    font-weight: 700;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.focus-stage-header h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--gray-900);
}

.focus-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
}

.focus-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 1.5rem;
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.focus-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }

.focus-card h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.focus-card ul {
    list-style: none;
    padding: 0;
}

.focus-card li {
    position: relative;
    padding-left: 1.25rem;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--gray-700);
    line-height: 1.6;
}

.focus-card li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 700;
}

.focus-card.danger-card { border-left: 4px solid var(--warning); }
.focus-card.danger-card h4 { color: var(--warning); }
.focus-card.danger-card li::before { color: var(--warning); }

/* --- 开关插座表格 --- */
.switches-section {
    margin-bottom: 3rem;
}

.switches-section h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary);
    display: inline-block;
}

.switch-table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.switch-table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    font-size: 0.9rem;
}

.switch-table th {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    font-weight: 600;
    padding: 0.75rem 1rem;
    text-align: left;
    white-space: nowrap;
}

.switch-table td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--gray-200);
    color: var(--gray-700);
}

.switch-table tr:hover td { background: var(--primary-light); }

.switch-table tr:last-child td { border-bottom: none; }

.type-badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
}

.type-badge.socket { background: var(--success-light); color: var(--success); }
.type-badge.switch { background: var(--info-light); color: var(--info); }
.type-badge.smart { background: var(--accent-light); color: #d97706; }

/* --- Markdown Content Area --- */
.md-content {
    max-width: 800px;
    margin: 0 auto;
}

.md-content h1 { font-size: 2rem; font-weight: 800; margin: 2rem 0 1rem; color: var(--gray-900); }
.md-content h2 { font-size: 1.5rem; font-weight: 700; margin: 1.75rem 0 0.75rem; color: var(--gray-900); padding-bottom: 0.5rem; border-bottom: 2px solid var(--gray-200); }
.md-content h3 { font-size: 1.2rem; font-weight: 700; margin: 1.5rem 0 0.5rem; color: var(--gray-800); }
.md-content p { margin-bottom: 1rem; color: var(--gray-700); }
.md-content ul, .md-content ol { padding-left: 1.5rem; margin-bottom: 1rem; }
.md-content li { margin-bottom: 0.4rem; color: var(--gray-700); }
.md-content blockquote {
    border-left: 4px solid var(--primary);
    padding: 1rem 1.5rem;
    margin: 1rem 0;
    background: var(--primary-light);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--gray-700);
}
.md-content code {
    background: var(--gray-100);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
}
.md-content pre {
    background: var(--gray-800);
    color: #e5e7eb;
    padding: 1rem;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin-bottom: 1rem;
}
.md-content strong { color: var(--gray-900); }
.md-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}
.md-content th, .md-content td {
    padding: 0.6rem 1rem;
    border: 1px solid var(--gray-200);
    text-align: left;
}
.md-content th { background: var(--gray-100); font-weight: 600; }

/* --- Responsive --- */
@media (max-width: 1024px) {
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .timeline-mini { grid-template-columns: repeat(3, 1fr); }
    .tips-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav-toggle { display: flex; }

    .nav-menu {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 1rem;
        box-shadow: var(--shadow-lg);
        border-bottom: 1px solid var(--gray-200);
    }

    .nav-menu.active { display: flex; }

    .hero-title { font-size: 2.2rem; }
    .hero-subtitle { font-size: 1.2rem; }

    .feature-grid { grid-template-columns: 1fr; }
    .timeline-mini { grid-template-columns: repeat(2, 1fr); }
    .tips-grid { grid-template-columns: 1fr; }

    .timeline::before { left: 16px; }
    .timeline-dot { left: 4px; width: 24px; height: 24px; font-size: 0.65rem; }
    .timeline-item { padding-left: 50px; }

    .footer-content { flex-direction: column; }

    .section-header h2 { font-size: 1.6rem; }
    .page-header h1 { font-size: 1.8rem; }
    .page-header { padding: 90px 1.5rem 40px; }
}

@media (max-width: 480px) {
    .hero { min-height: 420px; padding: 100px 1rem 60px; }
    .hero-title { font-size: 1.8rem; }
    .hero-actions { flex-direction: column; align-items: center; }
    .timeline-mini { grid-template-columns: 1fr 1fr; }
    .focus-grid { grid-template-columns: 1fr; }
}

/* --- Loading Indicator --- */
.loading {
    text-align: center;
    padding: 3rem;
    color: var(--gray-400);
}

.loading::after {
    content: '';
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-left: 0.5rem;
    vertical-align: middle;
}

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

/* --- Back to Top --- */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    z-index: 999;
}

.back-to-top.visible { display: flex; }
.back-to-top:hover { background: var(--primary-dark); transform: translateY(-2px); }