/* ===== 全局重置 & 燕麦色主题变量 ===== */
        :root {
            --oat-50: #F9F6F0;
            --oat-100: #F2EDE4;
            --oat-200: #E8E0D5;
            --oat-300: #D9CFC1;
            --oat-400: #C4B8A5;
            --oat-500: #B0A28C;
            --oat-600: #9A8A72;
            --oat-700: #7F6F5A;
            --oat-800: #66584A;
            --oat-900: #4D4238;

            --primary: #5B7F7A;
            --primary-light: #7A9F99;
            --primary-dark: #3E5E59;
            --accent: #C97B5A;
            --accent-light: #DB9A7A;

            --bg: var(--oat-50);
            --surface: #FFFFFF;
            --surface-soft: var(--oat-100);
            --text-primary: var(--oat-900);
            --text-secondary: var(--oat-700);
            --text-muted: var(--oat-500);
            --border: var(--oat-200);

            --shadow-sm: 0 2px 8px rgba(77, 66, 56, 0.06);
            --shadow-md: 0 8px 30px rgba(77, 66, 56, 0.08);
            --shadow-lg: 0 20px 60px rgba(77, 66, 56, 0.10);
            --shadow-xl: 0 30px 80px rgba(77, 66, 56, 0.14);

            --radius: 20px;
            --radius-sm: 12px;

            --transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            background: var(--bg);
            color: var(--text-primary);
            line-height: 1.6;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
        }
        img {
            max-width: 100%;
            display: block;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 玻璃态 & 装饰 ===== */
        .glass {
            background: rgba(255, 255, 255, 0.50);
            backdrop-filter: blur(18px) saturate(180%);
            -webkit-backdrop-filter: blur(18px) saturate(180%);
            border: 1px solid rgba(255, 255, 255, 0.60);
        }

        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--oat-200);
            color: var(--oat-800);
            font-size: 0.7rem;
            font-weight: 600;
            letter-spacing: 0.04em;
            padding: 4px 14px;
            border-radius: 100px;
            text-transform: uppercase;
        }

        .section-tag {
            display: inline-block;
            font-size: 0.7rem;
            font-weight: 600;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--primary);
            background: rgba(91, 127, 122, 0.10);
            padding: 4px 16px;
            border-radius: 100px;
            margin-bottom: 12px;
        }

        .section-title {
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 700;
            letter-spacing: -0.02em;
            line-height: 1.15;
            color: var(--text-primary);
        }

        .section-title span {
            color: var(--primary);
        }

        .section-desc {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 560px;
            line-height: 1.7;
        }

        /* ===== 按钮 ===== */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: 1rem;
            padding: 14px 34px;
            border-radius: 60px;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 8px 24px rgba(91, 127, 122, 0.25);
            letter-spacing: 0.01em;
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 14px 32px rgba(91, 127, 122, 0.30);
        }
        .btn-primary i {
            font-size: 1.1rem;
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: transparent;
            color: var(--text-primary);
            font-weight: 600;
            font-size: 1rem;
            padding: 12px 30px;
            border-radius: 60px;
            border: 1.5px solid var(--oat-300);
            cursor: pointer;
            transition: var(--transition);
        }
        .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: rgba(91, 127, 122, 0.04);
            transform: translateY(-2px);
        }

        .btn-accent {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: var(--accent);
            color: #fff;
            font-weight: 600;
            font-size: 1rem;
            padding: 14px 34px;
            border-radius: 60px;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 8px 24px rgba(201, 123, 90, 0.25);
        }
        .btn-accent:hover {
            background: #B86A4A;
            transform: translateY(-2px);
            box-shadow: 0 14px 32px rgba(201, 123, 90, 0.30);
        }

        /* ===== 导航 ===== */
        nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            padding: 16px 0;
            transition: var(--transition);
        }
        nav.scrolled {
            background: rgba(249, 246, 240, 0.80);
            backdrop-filter: blur(18px) saturate(180%);
            -webkit-backdrop-filter: blur(18px) saturate(180%);
            border-bottom: 1px solid rgba(232, 224, 213, 0.40);
            padding: 10px 0;
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.25rem;
            letter-spacing: -0.02em;
        }
        .nav-logo i {
            font-size: 1.6rem;
            color: var(--primary);
        }
        .nav-logo span {
            color: var(--text-primary);
        }
        .nav-logo small {
            font-weight: 400;
            font-size: 0.7rem;
            color: var(--text-muted);
            letter-spacing: 0.04em;
            margin-left: 4px;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }
        .nav-links a {
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: var(--transition);
        }
        .nav-links a:hover {
            color: var(--text-primary);
        }
        .nav-links a:hover::after {
            width: 100%;
        }
        .nav-cta {
            display: none;
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 4px;
        }
        .nav-toggle span {
            width: 26px;
            height: 2.5px;
            background: var(--text-primary);
            border-radius: 4px;
            transition: var(--transition);
        }

        /* ===== Hero ===== */
        .hero {
            padding: 140px 0 80px;
            position: relative;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: -30%;
            right: -10%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(91, 127, 122, 0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: -20%;
            left: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(201, 123, 90, 0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
            position: relative;
            z-index: 2;
        }
        .hero-content .badge {
            margin-bottom: 16px;
        }
        .hero-content h1 {
            font-size: clamp(2.6rem, 5.5vw, 4.2rem);
            font-weight: 800;
            letter-spacing: -0.03em;
            line-height: 1.08;
            margin-bottom: 16px;
        }
        .hero-content h1 span {
            color: var(--primary);
            position: relative;
        }
        .hero-content h1 span::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 0;
            right: 0;
            height: 6px;
            background: rgba(91, 127, 122, 0.15);
            border-radius: 4px;
        }
        .hero-content p {
            font-size: 1.15rem;
            color: var(--text-secondary);
            max-width: 480px;
            line-height: 1.8;
            margin-bottom: 32px;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
        }
        .hero-actions .badge-download {
            font-size: 0.75rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .hero-stats {
            display: flex;
            gap: 40px;
            margin-top: 40px;
            padding-top: 32px;
            border-top: 1px solid var(--border);
        }
        .hero-stats-item {
            text-align: left;
        }
        .hero-stats-item strong {
            display: block;
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--text-primary);
        }
        .hero-stats-item span {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        .hero-visual {
            display: flex;
            justify-content: center;
            align-items: center;
            position: relative;
        }
        .hero-phone {
            width: 100%;
            max-width: 380px;
            aspect-ratio: 9 / 19;
            background: var(--surface);
            border-radius: 36px;
            box-shadow: var(--shadow-xl);
            padding: 16px 12px 12px;
            position: relative;
            border: 1px solid rgba(255, 255, 255, 0.50);
        }
        .hero-phone .phone-notch {
            width: 100px;
            height: 24px;
            background: var(--oat-900);
            border-radius: 20px;
            margin: 0 auto 16px;
            position: relative;
        }
        .hero-phone .phone-notch::after {
            content: '';
            width: 10px;
            height: 10px;
            background: #2A2A2A;
            border-radius: 50%;
            position: absolute;
            right: 16px;
            top: 50%;
            transform: translateY(-50%);
        }
        .hero-phone .phone-screen {
            background: var(--bg);
            border-radius: 20px;
            padding: 20px 16px;
            min-height: 360px;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .phone-screen .mock-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 8px 0;
            border-bottom: 1px solid var(--border);
        }
        .phone-screen .mock-row .dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--primary-light);
        }
        .phone-screen .mock-row .dot.green {
            background: #4CAF50;
        }
        .phone-screen .mock-row .dot.orange {
            background: var(--accent);
        }
        .phone-screen .mock-bar {
            height: 6px;
            background: var(--oat-200);
            border-radius: 6px;
            margin: 4px 0;
            width: 100%;
        }
        .phone-screen .mock-bar.fill {
            background: var(--primary);
            width: 70%;
        }
        .phone-screen .mock-bar.fill2 {
            background: var(--primary-light);
            width: 45%;
        }
        .phone-screen .mock-grid {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 8px;
            margin-top: 8px;
        }
        .phone-screen .mock-grid .item {
            background: var(--surface);
            border-radius: 8px;
            padding: 12px 6px;
            text-align: center;
            font-size: 0.6rem;
            color: var(--text-secondary);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
        }
        .hero-float-badge {
            position: absolute;
            background: var(--surface);
            padding: 12px 20px;
            border-radius: 14px;
            box-shadow: var(--shadow-lg);
            font-size: 0.8rem;
            font-weight: 500;
            display: flex;
            align-items: center;
            gap: 10px;
            border: 1px solid rgba(255, 255, 255, 0.60);
            backdrop-filter: blur(8px);
            animation: float 4s ease-in-out infinite;
        }
        .hero-float-badge:nth-child(2) {
            top: 8%;
            right: -10%;
            animation-delay: 1s;
        }
        .hero-float-badge:nth-child(3) {
            bottom: 12%;
            left: -12%;
            animation-delay: 2s;
        }
        .hero-float-badge i {
            color: var(--primary);
            font-size: 1.2rem;
        }
        @keyframes float {
            0%,
            100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-12px);
            }
        }

        /* ===== 通用区块 ===== */
        section {
            padding: 80px 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 56px;
        }
        .section-header .section-desc {
            margin: 0 auto;
        }

        /* ===== Download ===== */
        .download {
            background: var(--surface);
            border-radius: var(--radius) var(--radius) 0 0;
            padding: 80px 0 100px;
            margin-top: -20px;
            position: relative;
        }
        .download-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .download-info h2 {
            font-size: clamp(2rem, 3.5vw, 2.8rem);
            font-weight: 700;
            letter-spacing: -0.02em;
            line-height: 1.2;
            margin-bottom: 12px;
        }
        .download-info p {
            color: var(--text-secondary);
            margin-bottom: 28px;
            font-size: 1.05rem;
        }
        .download-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
        }
        .download-card {
            background: var(--bg);
            border-radius: var(--radius-sm);
            padding: 20px 28px;
            display: flex;
            align-items: center;
            gap: 16px;
            border: 1px solid var(--border);
            transition: var(--transition);
            cursor: default;
            flex: 1 1 180px;
        }
        .download-card:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .download-card i {
            font-size: 2rem;
            color: var(--primary);
        }
        .download-card .info strong {
            display: block;
            font-size: 0.95rem;
        }
        .download-card .info small {
            font-size: 0.75rem;
            color: var(--text-muted);
        }

        .download-visual {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .download-visual .stat-card {
            background: var(--bg);
            border-radius: var(--radius-sm);
            padding: 24px 20px;
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .download-visual .stat-card:hover {
            border-color: var(--primary-light);
            box-shadow: var(--shadow-sm);
        }
        .download-visual .stat-card .num {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--primary);
        }
        .download-visual .stat-card .label {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* ===== Features ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 28px;
        }
        .feature-card {
            background: var(--surface);
            border-radius: var(--radius-sm);
            padding: 32px 28px;
            border: 1px solid var(--border);
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary-light);
        }
        .feature-card .icon {
            width: 52px;
            height: 52px;
            background: rgba(91, 127, 122, 0.08);
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 16px;
            font-size: 1.4rem;
            color: var(--primary);
        }
        .feature-card h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 8px;
        }
        .feature-card p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ===== Guide ===== */
        .guide {
            background: var(--surface-soft);
            border-radius: var(--radius);
        }
        .guide-steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 32px;
            counter-reset: step;
        }
        .guide-step {
            background: var(--surface);
            border-radius: var(--radius-sm);
            padding: 32px 24px;
            border: 1px solid var(--border);
            position: relative;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
            counter-increment: step;
        }
        .guide-step:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .guide-step::before {
            content: counter(step);
            position: absolute;
            top: -14px;
            left: 24px;
            background: var(--primary);
            color: #fff;
            font-weight: 700;
            font-size: 0.85rem;
            width: 32px;
            height: 32px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 12px rgba(91, 127, 122, 0.25);
        }
        .guide-step h4 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-top: 8px;
            margin-bottom: 6px;
        }
        .guide-step p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== Highlights ===== */
        .highlights-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }
        .highlight-item {
            background: var(--surface);
            border-radius: var(--radius-sm);
            padding: 28px 24px;
            border: 1px solid var(--border);
            display: flex;
            gap: 18px;
            align-items: flex-start;
            transition: var(--transition);
        }
        .highlight-item:hover {
            border-color: var(--primary-light);
            box-shadow: var(--shadow-sm);
        }
        .highlight-item .icon {
            font-size: 1.8rem;
            color: var(--primary);
            flex-shrink: 0;
            margin-top: 2px;
        }
        .highlight-item h4 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 4px;
        }
        .highlight-item p {
            font-size: 0.9rem;
            color: var(--text-secondary);
        }

        /* ===== Advanced ===== */
        .advanced-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 24px;
        }
        .advanced-card {
            background: var(--surface);
            border-radius: var(--radius-sm);
            padding: 28px 24px;
            border: 1px solid var(--border);
            text-align: center;
            transition: var(--transition);
        }
        .advanced-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary-light);
        }
        .advanced-card i {
            font-size: 2.2rem;
            color: var(--primary);
            margin-bottom: 12px;
        }
        .advanced-card h4 {
            font-size: 1.05rem;
            font-weight: 600;
        }
        .advanced-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-top: 4px;
        }

        /* ===== FAQ ===== */
        .faq {
            background: var(--surface-soft);
            border-radius: var(--radius);
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--surface);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-light);
        }
        .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            user-select: none;
            gap: 16px;
        }
        .faq-question i {
            transition: var(--transition);
            color: var(--text-muted);
            font-size: 1rem;
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== About ===== */
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .about-text h2 {
            font-size: clamp(2rem, 3vw, 2.6rem);
            font-weight: 700;
            letter-spacing: -0.02em;
            line-height: 1.2;
            margin-bottom: 16px;
        }
        .about-text p {
            color: var(--text-secondary);
            font-size: 1.05rem;
            line-height: 1.8;
            margin-bottom: 20px;
        }
        .about-stats {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }
        .about-stats .stat {
            background: var(--surface);
            padding: 20px 16px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            text-align: center;
        }
        .about-stats .stat strong {
            display: block;
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--primary);
        }
        .about-stats .stat span {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* ===== Changelog ===== */
        .changelog {
            background: var(--surface-soft);
            border-radius: var(--radius);
        }
        .changelog-timeline {
            display: flex;
            flex-direction: column;
            gap: 16px;
            max-width: 700px;
            margin: 0 auto;
        }
        .changelog-item {
            display: flex;
            gap: 20px;
            align-items: flex-start;
            padding: 16px 20px;
            background: var(--surface);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
        }
        .changelog-item .version {
            font-weight: 700;
            color: var(--primary);
            min-width: 80px;
            font-size: 0.95rem;
        }
        .changelog-item .desc {
            color: var(--text-secondary);
            font-size: 0.92rem;
        }
        .changelog-item .tag {
            background: rgba(91, 127, 122, 0.10);
            color: var(--primary);
            font-size: 0.7rem;
            font-weight: 600;
            padding: 2px 12px;
            border-radius: 100px;
            margin-left: 8px;
            text-transform: uppercase;
        }

        /* ===== Testimonials ===== */
        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 24px;
        }
        .testimonial-card {
            background: var(--surface);
            border-radius: var(--radius-sm);
            padding: 28px 24px;
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .testimonial-card:hover {
            border-color: var(--primary-light);
            box-shadow: var(--shadow-sm);
        }
        .testimonial-card .stars {
            color: #F5B342;
            font-size: 0.9rem;
            letter-spacing: 2px;
            margin-bottom: 10px;
        }
        .testimonial-card blockquote {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.7;
            font-style: italic;
            margin-bottom: 14px;
        }
        .testimonial-card .author {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .testimonial-card .author .avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--oat-200);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
            color: var(--text-secondary);
            font-size: 0.9rem;
        }
        .testimonial-card .author .name {
            font-weight: 600;
            font-size: 0.9rem;
        }
        .testimonial-card .author .role {
            font-size: 0.75rem;
            color: var(--text-muted);
        }

        /* ===== Contact ===== */
        .contact {
            background: var(--surface);
            border-radius: var(--radius) var(--radius) 0 0;
        }
        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
        }
        .contact-info h2 {
            font-size: clamp(2rem, 3vw, 2.6rem);
            font-weight: 700;
            letter-spacing: -0.02em;
            line-height: 1.2;
            margin-bottom: 12px;
        }
        .contact-info p {
            color: var(--text-secondary);
            font-size: 1.05rem;
            line-height: 1.8;
            margin-bottom: 28px;
        }
        .contact-info .item {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-bottom: 14px;
        }
        .contact-info .item i {
            width: 40px;
            height: 40px;
            background: rgba(91, 127, 122, 0.08);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 1rem;
        }
        .contact-info .item span {
            font-size: 0.95rem;
            color: var(--text-secondary);
        }

        .contact-form {
            background: var(--bg);
            padding: 36px 32px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
        }
        .contact-form .form-group {
            margin-bottom: 18px;
        }
        .contact-form label {
            display: block;
            font-weight: 500;
            font-size: 0.85rem;
            margin-bottom: 4px;
            color: var(--text-secondary);
        }
        .contact-form input,
        .contact-form textarea {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            background: var(--surface);
            font-family: inherit;
            font-size: 0.95rem;
            transition: var(--transition);
            color: var(--text-primary);
        }
        .contact-form input:focus,
        .contact-form textarea:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 4px rgba(91, 127, 122, 0.08);
        }
        .contact-form textarea {
            resize: vertical;
            min-height: 120px;
        }

        /* ===== Footer ===== */
        footer {
            background: var(--surface);
            padding: 40px 0 28px;
            border-top: 1px solid var(--border);
        }
        .footer-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }
        .footer-inner .copy {
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        .footer-socials {
            display: flex;
            gap: 16px;
        }
        .footer-socials a {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--bg);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-secondary);
            transition: var(--transition);
            border: 1px solid var(--border);
        }
        .footer-socials a:hover {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            transform: translateY(-2px);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .hero-grid {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .hero-content p {
                margin-left: auto;
                margin-right: auto;
            }
            .hero-actions {
                justify-content: center;
            }
            .hero-stats {
                justify-content: center;
            }
            .hero-visual {
                order: -1;
            }
            .hero-float-badge {
                display: none;
            }
            .download-grid {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .download-buttons {
                justify-content: center;
            }
            .download-visual {
                grid-template-columns: 1fr 1fr;
                max-width: 400px;
                margin: 0 auto;
            }
            .about-grid {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .about-stats {
                max-width: 400px;
                margin: 0 auto;
            }
            .contact-grid {
                grid-template-columns: 1fr;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                background: rgba(249, 246, 240, 0.96);
                backdrop-filter: blur(18px);
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                padding: 24px;
                gap: 20px;
                border-radius: 0 0 var(--radius) var(--radius);
                border: 1px solid var(--border);
                border-top: none;
            }
            .nav-links.open {
                display: flex;
            }
            .nav-toggle {
                display: flex;
            }
            .nav-cta {
                display: inline-flex;
            }
        }

        @media (max-width: 600px) {
            .hero {
                padding: 120px 0 60px;
            }
            .hero-phone {
                max-width: 280px;
            }
            .download-visual {
                grid-template-columns: 1fr;
            }
            .hero-stats {
                flex-direction: column;
                gap: 12px;
                align-items: center;
            }
            .download-card {
                flex: 1 1 100%;
            }
            .about-stats {
                grid-template-columns: 1fr 1fr;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .contact-form {
                padding: 24px 18px;
            }
            .footer-inner {
                flex-direction: column;
                text-align: center;
            }
        }


/* === site extensions (lang switch / download page / secondary shell) === */
.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-left: 8px;
  font-size: 0.8rem;
}
.lang-switch a {
  color: var(--text-muted);
  text-decoration: none;
  padding: 4px 8px;
  border-radius: 6px;
  border: 1px solid transparent;
}
.lang-switch a:hover { color: var(--primary); }
.lang-switch a.active {
  color: var(--primary-dark);
  border-color: var(--border);
  background: var(--surface);
  font-weight: 600;
}
a.download-card {
  text-decoration: none;
  color: inherit;
  display: flex;
  cursor: pointer;
}
.download-page-hero {
  padding: 7.5rem 0 2.5rem;
}
.download-page-hero h1 {
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  margin: 0.4rem 0 0.8rem;
}
.download-specs {
  display: grid;
  gap: 1.25rem;
  margin-top: 1.5rem;
}
.download-spec-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.35rem 1.4rem;
  box-shadow: var(--shadow-sm, 0 4px 16px rgba(77,66,56,.06));
}
.download-spec-card h3 {
  margin: 0 0 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.55rem;
}
.download-spec-card ul {
  margin: 0.6rem 0 1rem;
  padding-left: 1.1rem;
  color: var(--text-secondary);
}
.download-spec-card li { margin: 0.35rem 0; }
.page-shell main {
  padding: 6.5rem 0 3rem;
  min-height: 55vh;
}
.page-prose {
  max-width: 760px;
}
.page-prose h1 { margin: 0.35rem 0 0.75rem; }
.page-prose .deck { color: var(--text-secondary); margin-bottom: 1.25rem; }
.page-prose .surface-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.25rem 1.35rem;
}
.page-prose ul { padding-left: 1.2rem; color: var(--text-secondary); }
.page-prose li { margin: 0.4rem 0; }
.inline-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1rem; }
.nav-links a[aria-current="page"] { color: var(--primary-dark); font-weight: 600; }