:root {
     --bg-base: #ffffff;
     --bg-alt: #f8fafc;
     --bg-dark: #0f172a;
     --text-main: #0f172a;
     --text-muted: #475569;
     --text-light: #f1f5f9;
     --border-light: #e2e8f0;
     --border-dark: #334155;

     --brand-primary: #1e3a8a;
     --brand-accent: #2563eb;
     --brand-gold: #f59e0b;
     --brand-green: #059669;
     --brand-purple: #7c3aed;
     --brand-rose: #e11d48;
     --brand-teal: #0d9488;

     --radius-sm: 12px;
     --radius-md: 20px;
     --radius-lg: 32px;

     --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
     --shadow-md: 0 10px 25px -3px rgba(0, 0, 0, 0.05);
     --shadow-lg: 0 25px 50px -12px rgba(0, 0, 0, 0.1);
     --shadow-hover: 0 30px 60px -15px rgba(37, 99, 235, 0.15);

     --max-width: 1300px;
 }

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

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

 body {
     font-family: 'Inter', sans-serif;
     color: var(--text-main);
     background-color: var(--bg-base);
     line-height: 1.7;
     overflow-x: hidden;
 }

 img {
     max-width: 100%;
     height: auto;
     display: block;
     border-radius: var(--radius-sm);
 }

 a {
     text-decoration: none;
     color: inherit;
 }

 .container {
     width: min(var(--max-width), 100% - 40px);
     margin: 0 auto;
 }

 .section-pad {
     padding: 100px 0;
 }

 /* Typography */
 h1 {
     font-size: clamp(2.5rem, 5vw, 4.5rem);
     font-weight: 800;
     line-height: 1.1;
     letter-spacing: -0.03em;
     color: var(--text-main);
     margin-bottom: 1rem;
 }

 h2 {
     font-size: clamp(2rem, 3.5vw, 2.75rem);
     font-weight: 700;
     line-height: 1.2;
     letter-spacing: -0.02em;
     margin-bottom: 1.5rem;
 }

 h3 {
     font-size: 1.5rem;
     font-weight: 700;
     line-height: 1.3;
     margin-bottom: 1rem;
 }

 h4 {
     font-size: 1.25rem;
     font-weight: 600;
     margin-bottom: 0.5rem;
 }

 p {
     margin-bottom: 1.25rem;
     color: var(--text-muted);
     font-size: 1.05rem;
     line-height: 1.8;
 }

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

 .section-header {
     max-width: 800px;
     margin: 0 auto 50px;
     text-align: center;
 }

 /* Utility Tags & Badges */
 .tag {
     display: inline-flex;
     align-items: center;
     padding: 6px 14px;
     border-radius: 100px;
     font-size: 0.85rem;
     font-weight: 700;
     letter-spacing: 0.05em;
     text-transform: uppercase;
     margin-bottom: 1rem;
 }

 .tag-blue {
     background: #eff6ff;
     color: #1d4ed8;
     border: 1px solid #dbeafe;
 }

 .tag-gold {
     background: #fffbeb;
     color: #b45309;
     border: 1px solid #fef3c7;
 }

 .tag-green {
     background: #ecfdf5;
     color: #047857;
     border: 1px solid #d1fae5;
 }

 .tag-purple {
     background: #f5f3ff;
     color: #6d28d9;
     border: 1px solid #ede9fe;
 }

 .tag-rose {
     background: #fff1f2;
     color: #e11d48;
     border: 1px solid #ffe4e6;
 }

 .tag-teal {
     background: #f0fdfa;
     color: #0f766e;
     border: 1px solid #ccfbf1;
 }

 .badge-wrap {
     display: flex;
     flex-wrap: wrap;
     gap: 10px;
     margin: 1.5rem 0;
 }

 .badge {
     padding: 8px 16px;
     background: var(--bg-alt);
     border: 1px solid var(--border-light);
     border-radius: 100px;
     font-size: 0.95rem;
     font-weight: 600;
     color: var(--text-main);
     box-shadow: var(--shadow-sm);
     display: inline-flex;
     align-items: center;
     gap: 8px;
 }

 .badge::before {
     content: '';
     width: 8px;
     height: 8px;
     border-radius: 50%;
     background: var(--brand-accent);
 }

 /* Buttons */
 .btn {
     display: inline-flex;
     align-items: center;
     justify-content: center;
     padding: 16px 32px;
     border-radius: 100px;
     font-weight: 600;
     font-size: 1.05rem;
     transition: all 0.3s ease;
     cursor: pointer;
     border: none;
 }

 .btn-primary {
     background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
     color: white;
     box-shadow: 0 10px 20px -5px rgba(37, 99, 235, 0.4);
 }

 .btn-primary:hover {
     transform: translateY(-2px);
     box-shadow: 0 15px 25px -5px rgba(37, 99, 235, 0.5);
 }

 .btn-outline {
     background: white;
     color: var(--text-main);
     border: 2px solid var(--border-light);
 }

 .btn-outline:hover {
     border-color: var(--brand-accent);
     color: var(--brand-accent);
     transform: translateY(-2px);
 }

 /* Header */
 .header {
     position: sticky;
     top: 0;
     z-index: 1000;
     background: rgba(255, 255, 255, 0.95);
     backdrop-filter: blur(12px);
     border-bottom: 1px solid var(--border-light);
     padding: 15px 0;
 }

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

 /*.logo {
     font-size: 1.25rem;
     font-weight: 800;
     color: var(--brand-primary);
     display: flex;
     align-items: center;
     gap: 10px;
 }*/

 .logo-icon {
     width: 36px;
     height: 36px;
     background: linear-gradient(135deg, var(--brand-gold), var(--brand-rose));
     border-radius: 10px;
 }

 .nav-links {
     display: flex;
     gap: 24px;
     align-items: center;
 }

 .nav-links a {
     font-weight: 600;
     color: var(--text-muted);
     transition: color 0.2s;
     font-size: 0.95rem;
 }

 .nav-links a:hover {
     color: var(--brand-accent);
 }

 /* ========================================================
       优化的首屏 (Hero Section) - 沉浸式实景背景 + 动态光晕1920px（宽） × 1080px（高）
       ======================================================== */
 .hero {
     padding: 140px 0 100px;
     text-align: center;
     position: relative;
     overflow: hidden;

     /* 1. 引入高端现代商务大楼实景，叠加 75%-95% 的极深午夜蓝渐变遮罩，设置 fixed 实现视差滚动 */
     background:
         linear-gradient(180deg, rgba(6, 15, 34, 0.75) 0%, rgba(6, 15, 34, 0.95) 100%),
         url('../images/miandianjinfota.jpg') center/cover no-repeat fixed;
     background-color: #060f22;
     /* 兜底颜色 */
     color: white;
 }

 /* 动态多彩流光背景 */
 .hero::before {
     content: '';
     position: absolute;
     top: -30%;
     left: -10%;
     width: 60vw;
     height: 60vw;
     background: radial-gradient(circle, rgba(37, 99, 235, 0.5) 0%, transparent 60%);
     filter: blur(90px);
     z-index: 0;
     animation: float1 15s ease-in-out infinite alternate;
 }

 .hero::after {
     content: '';
     position: absolute;
     bottom: -30%;
     right: -10%;
     width: 50vw;
     height: 50vw;
     background: radial-gradient(circle, rgba(245, 158, 11, 0.4) 0%, transparent 60%);
     filter: blur(90px);
     z-index: 0;
     animation: float2 12s ease-in-out infinite alternate;
 }

 @keyframes float1 {
     0% {
         transform: translate(0, 0);
     }

     100% {
         transform: translate(5%, 5%);
     }
 }

 @keyframes float2 {
     0% {
         transform: translate(0, 0);
     }

     100% {
         transform: translate(-5%, -5%);
     }
 }

 .hero-content {
     position: relative;
     z-index: 1;
     max-width: 1000px;
     margin: 0 auto;
 }

 .hero h1 {
     color: white;
     text-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
 }

 .hero p {
     color: rgba(255, 255, 255, 0.85);
 }

 .hero-tag {
     background: rgba(37, 99, 235, 0.2);
     color: #60a5fa;
     border: 1px solid rgba(37, 99, 235, 0.4);
     backdrop-filter: blur(10px);
 }

 .hero .badge {
     background: rgba(255, 255, 255, 0.1);
     border-color: rgba(255, 255, 255, 0.2);
     color: white;
     backdrop-filter: blur(10px);
     box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
 }

 .hero .badge::before {
     background: var(--brand-gold);
 }

 .hero .btn-primary {
     background: linear-gradient(135deg, var(--brand-gold), #d97706);
     color: #fff;
     box-shadow: 0 10px 20px -5px rgba(245, 158, 11, 0.4);
 }

 .hero .btn-primary:hover {
     box-shadow: 0 15px 25px -5px rgba(245, 158, 11, 0.6);
 }

 .hero .btn-outline {
     background: rgba(255, 255, 255, 0.05);
     color: white;
     border-color: rgba(255, 255, 255, 0.3);
     backdrop-filter: blur(5px);
 }

 .hero .btn-outline:hover {
     background: white;
     color: #060f22;
     border-color: white;
 }

 /* Trust Banner */
 .trust-banner {
     border-bottom: 1px solid var(--border-light);
     padding: 30px 0;
     background: var(--bg-alt);
 }

 .trust-logos {
     display: flex;
     justify-content: center;
     gap: 40px;
     flex-wrap: wrap;
     opacity: 0.5;
     filter: grayscale(100%);
     align-items: center;
 }

 .trust-logos span {
     font-size: 1.25rem;
     font-weight: 800;
     letter-spacing: -0.05em;
 }

 /* Bento Grid */
 .bento-grid {
     display: grid;
     grid-template-columns: repeat(4, 1fr);
     gap: 20px;
     margin-top: 60px;
     text-align: left;
 }

 .bento-card {
     background: white;
     padding: 40px;
     border-radius: var(--radius-md);
     border: 1px solid var(--border-light);
     box-shadow: var(--shadow-sm);
     transition: transform 0.3s, box-shadow 0.3s;
     position: relative;
     overflow: hidden;
 }

 .bento-card:hover {
     transform: translateY(-5px);
     box-shadow: var(--shadow-hover);
 }

 .bento-card.large {
     grid-column: span 2;
     background: linear-gradient(135deg, #f8fafc, #f1f5f9);
 }

 .bento-icon {
     width: 56px;
     height: 56px;
     border-radius: 14px;
     display: flex;
     align-items: center;
     justify-content: center;
     font-size: 1.75rem;
     margin-bottom: 24px;
 }

 .bg-blue {
     background: #dbeafe;
     color: #1d4ed8;
 }

 .bg-gold {
     background: #fef3c7;
     color: #b45309;
 }

 .bg-green {
     background: #d1fae5;
     color: #047857;
 }

 .bg-purple {
     background: #ede9fe;
     color: #6d28d9;
 }

 /* Split Section */
 .split-grid {
     display: grid;
     grid-template-columns: 1fr 1fr;
     gap: 60px;
     align-items: center;
 }

 .split-grid.reverse {
     direction: rtl;
 }

 .split-grid.reverse>* {
     direction: ltr;
 }

 .image-wrapper {
     position: relative;
     border-radius: var(--radius-lg);
     overflow: hidden;
     box-shadow: var(--shadow-lg);
 }

 .image-wrapper img {
     width: 100%;
     height: 600px;
     object-fit: cover;
     transition: transform 0.5s;
 }

 .image-wrapper:hover img {
     transform: scale(1.03);
 }

 /* Rich Text Content Blocks */
 .content-box {
     background: white;
     border: 1px solid var(--border-light);
     border-radius: var(--radius-md);
     padding: 40px;
     box-shadow: var(--shadow-sm);
     margin-bottom: 30px;
     border-left: 6px solid var(--brand-primary);
 }

 ul.check-list {
     list-style: none;
     margin: 20px 0;
 }

 ul.check-list li {
     position: relative;
     padding-left: 36px;
     margin-bottom: 16px;
     font-size: 1.05rem;
     color: var(--text-muted);
 }

 ul.check-list li::before {
     content: '✓';
     position: absolute;
     left: 0;
     top: 0;
     width: 24px;
     height: 24px;
     background: var(--brand-green);
     color: white;
     border-radius: 50%;
     display: flex;
     align-items: center;
     justify-content: center;
     font-size: 0.8rem;
     font-weight: bold;
 }

 /* Timeline Section */
 .timeline {
     position: relative;
     max-width: 800px;
     margin: 0 auto;
     padding: 40px 0;
 }

 .timeline::before {
     content: '';
     position: absolute;
     left: 50px;
     top: 0;
     bottom: 0;
     width: 2px;
     background: var(--border-light);
 }

 .timeline-item {
     position: relative;
     padding-left: 100px;
     margin-bottom: 50px;
 }

 .timeline-number {
     position: absolute;
     left: 30px;
     top: 0;
     width: 44px;
     height: 44px;
     background: white;
     border: 2px solid var(--brand-accent);
     border-radius: 50%;
     display: flex;
     align-items: center;
     justify-content: center;
     font-weight: bold;
     color: var(--brand-accent);
     font-size: 1.2rem;
     box-shadow: 0 0 0 10px var(--bg-base);
 }

 .timeline-content {
     background: var(--bg-alt);
     padding: 30px;
     border-radius: var(--radius-md);
     border: 1px solid var(--border-light);
 }

 /* Comparison Table */
 .table-wrapper {
     overflow-x: auto;
     background: white;
     border-radius: var(--radius-lg);
     box-shadow: var(--shadow-lg);
     border: 1px solid var(--border-light);
     margin-top: 40px;
 }

 table {
     width: 100%;
     border-collapse: collapse;
     text-align: left;
     min-width: 900px;
 }

 th,
 td {
     padding: 24px 30px;
     border-bottom: 1px solid var(--border-light);
     vertical-align: top;
 }

 th {
     background: #f8fafc;
     font-size: 1.1rem;
     color: var(--text-main);
     font-weight: 700;
 }

 td {
     font-size: 1.05rem;
     color: var(--text-muted);
 }

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

 .highlight-cell {
     background: #f0fdf4;
     border-left: 4px solid var(--brand-green);
 }

 /* Dark Mode Section */
 .dark-section {
     background: var(--bg-dark);
     color: var(--text-light);
     padding: 100px 0;
 }

 .dark-section h2,
 .dark-section h3,
 .dark-section h4 {
     color: white;
 }

 .dark-section p {
     color: #94a3b8;
 }

 .dark-card {
     background: #1e293b;
     border: 1px solid var(--border-dark);
     border-radius: var(--radius-md);
     padding: 40px;
 }

 .dark-card:hover {
     border-color: var(--brand-accent);
 }

 /* Grid Sections */
 .adv-grid {
     display: grid;
     grid-template-columns: repeat(3, 1fr);
     gap: 30px;
     margin-top: 40px;
 }

 .adv-card {
     background: white;
     padding: 40px 30px;
     border-radius: var(--radius-md);
     border: 1px solid var(--border-light);
     transition: all 0.3s;
     box-shadow: var(--shadow-sm);
 }

 .adv-card:hover {
     transform: translateY(-5px);
     box-shadow: var(--shadow-md);
     border-color: var(--brand-accent);
 }

 .adv-card-icon {
     width: 50px;
     height: 50px;
     background: var(--bg-alt);
     border-radius: 50%;
     display: flex;
     align-items: center;
     justify-content: center;
     font-size: 1.5rem;
     margin-bottom: 20px;
 }

 /* Cost Table */
 .cost-grid {
     display: grid;
     grid-template-columns: 1fr 1fr;
     gap: 40px;
     margin-top: 40px;
 }

 .cost-card {
     background: white;
     border: 1px solid var(--border-light);
     border-radius: var(--radius-md);
     overflow: hidden;
     box-shadow: var(--shadow-sm);
 }

 .cost-header {
     background: #f8fafc;
     padding: 30px;
     border-bottom: 1px solid var(--border-light);
 }

 .cost-body {
     padding: 30px;
 }

 .cost-row {
     display: flex;
     justify-content: space-between;
     padding: 18px 0;
     border-bottom: 1px dashed var(--border-light);
 }

 .cost-row:last-child {
     border-bottom: none;
 }

 .cost-label {
     color: var(--text-muted);
     font-weight: 500;
 }

 .cost-value {
     font-weight: 700;
     color: var(--text-main);
 }

 /* Case Studies (Horizontal scroll on mobile) */
 .case-grid {
     display: grid;
     grid-template-columns: repeat(3, 1fr);
     gap: 30px;
     margin-top: 50px;
 }

 .case-card {
     background: white;
     border-radius: var(--radius-md);
     border: 1px solid var(--border-light);
     overflow: hidden;
     box-shadow: var(--shadow-sm);
     transition: all 0.3s ease;
     display: flex;
     flex-direction: column;
 }

 .case-card:hover {
     transform: translateY(-5px);
     box-shadow: var(--shadow-lg);
     border-color: var(--brand-accent);
 }

 .case-header {
     padding: 30px 30px 20px;
     border-bottom: 1px solid var(--border-light);
     background: #f8fafc;
 }

 .case-body {
     padding: 30px;
     flex-grow: 1;
 }

 .crisis-box {
     background: #fff1f2;
     border-left: 4px solid #e11d48;
     padding: 15px 20px;
     border-radius: 0 8px 8px 0;
     margin-bottom: 20px;
 }

 .crisis-box h5 {
     color: #be123c;
     font-size: 1rem;
     margin-bottom: 5px;
     text-transform: uppercase;
     letter-spacing: 0.05em;
 }

 .crisis-box p {
     color: #881337;
     font-size: 0.95rem;
     margin: 0;
     line-height: 1.6;
 }

 .solution-box {
     background: #f0fdf4;
     border-left: 4px solid #059669;
     padding: 15px 20px;
     border-radius: 0 8px 8px 0;
 }

 .solution-box h5 {
     color: #047857;
     font-size: 1rem;
     margin-bottom: 5px;
     text-transform: uppercase;
     letter-spacing: 0.05em;
 }

 .solution-box p {
     color: #064e3b;
     font-size: 0.95rem;
     margin: 0;
     line-height: 1.6;
 }

 .case-footer {
     background: var(--bg-dark);
     padding: 20px 30px;
     display: flex;
     justify-content: space-between;
     align-items: center;
     color: white;
 }

 .case-metric {
     display: flex;
     flex-direction: column;
 }

 .metric-value {
     font-size: 1.25rem;
     font-weight: 800;
     color: var(--brand-gold);
 }

 .metric-label {
     font-size: 0.8rem;
     color: #94a3b8;
     text-transform: uppercase;
     letter-spacing: 0.05em;
 }

 /* FAQ Section */
 .faq-section {
     max-width: 900px;
     margin: 0 auto;
 }

 .faq-item {
     margin-bottom: 16px;
     border: 1px solid var(--border-light);
     border-radius: var(--radius-sm);
     background: white;
     overflow: hidden;
     box-shadow: var(--shadow-sm);
 }

 .faq-summary {
     padding: 24px;
     font-size: 1.15rem;
     font-weight: 700;
     cursor: pointer;
     display: flex;
     justify-content: space-between;
     align-items: center;
     list-style: none;
 }

 .faq-summary::-webkit-details-marker {
     display: none;
 }

 .faq-content {
     padding: 0 24px 24px;
     color: var(--text-muted);
     line-height: 1.8;
     border-top: 1px solid var(--border-light);
     margin-top: 10px;
     padding-top: 20px;
 }

 /* Big CTA Bottom */
 .cta-bottom {
     margin: 100px 0;
     padding: 80px;
     background: linear-gradient(135deg, var(--brand-primary), #0f172a);
     border-radius: var(--radius-lg);
     text-align: center;
     color: white;
     position: relative;
     overflow: hidden;
     box-shadow: var(--shadow-lg);
 }

 .cta-bottom h2 {
     color: white;
     margin-bottom: 20px;
 }

 .cta-bottom p {
     color: #cbd5e1;
     font-size: 1.2rem;
     max-width: 700px;
     margin: 0 auto 40px;
 }

 /* Footer */
 footer {
     background: #0f172a;
     color: #94a3b8;
     padding: 60px 0;
     text-align: center;
 }

 /* ========================================================
       优化的左下角悬浮目录 (Floating ToC) CSS 
       ======================================================== */
 .floating-toc-wrapper {
     position: fixed;
     bottom: 40px;
     left: 40px;
     /* 已从右侧调整至左侧 */
     z-index: 9999;
 }

 .toc-toggle-btn {
     background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
     color: white;
     border: none;
     border-radius: 100px;
     padding: 14px 28px;
     font-family: 'Inter', sans-serif;
     font-weight: 600;
     font-size: 1rem;
     display: flex;
     align-items: center;
     gap: 10px;
     cursor: pointer;
     box-shadow: 0 10px 25px -5px rgba(37, 99, 235, 0.4);
     transition: transform 0.3s ease, box-shadow 0.3s ease;
 }

 .toc-toggle-btn:hover {
     transform: translateY(-3px);
     box-shadow: 0 15px 30px -5px rgba(37, 99, 235, 0.5);
 }

 .toc-toggle-btn svg {
     width: 22px;
     height: 22px;
     fill: currentColor;
 }

 .floating-toc-panel {
     position: absolute;
     bottom: calc(100% + 20px);
     left: 0;
     /* 对齐到左侧 */
     width: 320px;
     background: rgba(255, 255, 255, 0.95);
     backdrop-filter: blur(10px);
     border: 1px solid var(--border-light);
     border-radius: var(--radius-md);
     box-shadow: var(--shadow-lg);
     opacity: 0;
     visibility: hidden;
     transform: translateY(20px) scale(0.95);
     transform-origin: bottom left;
     /* 动画起点调整至左下 */
     transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
     overflow: hidden;
 }

 .floating-toc-panel.active {
     opacity: 1;
     visibility: visible;
     transform: translateY(0) scale(1);
 }

 .toc-panel-header {
     background: var(--bg-alt);
     padding: 18px 24px;
     border-bottom: 1px solid var(--border-light);
     display: flex;
     justify-content: space-between;
     align-items: center;
 }

 .toc-title {
     font-weight: 800;
     color: var(--brand-primary);
     font-size: 1.05rem;
     display: flex;
     align-items: center;
     gap: 8px;
 }

 .toc-title::before {
     content: '';
     display: block;
     width: 8px;
     height: 8px;
     background: var(--brand-accent);
     border-radius: 50%;
 }

 .toc-close-btn {
     background: none;
     border: none;
     font-size: 1.75rem;
     color: var(--text-muted);
     cursor: pointer;
     line-height: 1;
     transition: color 0.2s;
 }

 .toc-close-btn:hover {
     color: var(--brand-rose);
 }

 .toc-list {
     list-style: none;
     padding: 15px 0;
     margin: 0;
     max-height: 55vh;
     overflow-y: auto;
 }

 .toc-list::-webkit-scrollbar {
     width: 6px;
 }

 .toc-list::-webkit-scrollbar-track {
     background: transparent;
 }

 .toc-list::-webkit-scrollbar-thumb {
     background: #cbd5e1;
     border-radius: 10px;
 }

 .toc-list li a {
     display: block;
     padding: 12px 24px;
     color: var(--text-muted);
     font-weight: 600;
     font-size: 0.95rem;
     transition: all 0.2s ease;
     border-left: 4px solid transparent;
     text-decoration: none;
 }

 .toc-list li a:hover {
     background: #eff6ff;
     color: var(--brand-accent);
     border-left-color: var(--brand-accent);
     padding-left: 28px;
 }

 /* 响应式调整 */
 @media (max-width: 1024px) {
     .bento-grid {
         grid-template-columns: repeat(2, 1fr);
     }

     .split-grid,
     .cost-grid,
     .adv-grid {
         grid-template-columns: 1fr;
         gap: 40px;
     }

     .case-grid {
         display: flex;
         overflow-x: auto;
         scroll-snap-type: x mandatory;
         padding-bottom: 20px;
         -webkit-overflow-scrolling: touch;
     }

     .case-grid::-webkit-scrollbar {
         height: 8px;
     }

     .case-grid::-webkit-scrollbar-track {
         background: var(--bg-alt);
         border-radius: 4px;
     }

     .case-grid::-webkit-scrollbar-thumb {
         background: var(--border-light);
         border-radius: 4px;
     }

     .case-card {
         min-width: 320px;
         scroll-snap-align: start;
         flex: 0 0 85%;
     }
 }

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

     .bento-card.large {
         grid-column: span 1;
     }

     .nav-links {
         display: none;
     }

     h1 {
         font-size: 2.2rem;
     }

     .hero-actions {
         flex-direction: column;
     }

     .timeline::before {
         left: 20px;
     }

     .timeline-item {
         padding-left: 60px;
     }

     .timeline-number {
         left: 0;
         width: 40px;
         height: 40px;
     }

     /* 移动端悬浮目录靠左 */
     .floating-toc-wrapper {
         bottom: 20px;
         left: 20px;
     }

     .toc-toggle-btn {
         padding: 15px;
         border-radius: 50%;
     }

     .toc-toggle-btn span {
         display: none;
     }

     .floating-toc-panel {
         width: 280px;
     }
 }