/* roulang page: index */
/* ============ CSS CUSTOM PROPERTIES / 设计变量 ============ */
        :root {
            --color-primary: #1A1D27;
            --color-accent: #A68B5B;
            --color-accent-light: rgba(166, 139, 91, 0.12);
            --color-accent-glow: rgba(166, 139, 91, 0.18);
            --color-text-bright: #F2F1EB;
            --color-text-body: #3A3D45;
            --color-text-muted: #6B6E76;
            --color-text-light: #8A8D93;
            --color-bg-warm: #F7F6F2;
            --color-bg-dark: #12141C;
            --color-bg-card: #FFFFFF;
            --color-bg-nav: #FAFAF9;
            --color-border-subtle: #E8E5DF;
            --color-border-nav: #EBE8E2;
            --color-placeholder-bg: #DCD9D1;
            --color-faq-border: #E8E5DF;
            --color-footer-bg: #F0EFEB;
            --font-heading: 'Noto Serif SC', 'Source Han Serif SC', '思源宋体', Georgia, 'Times New Roman', serif;
            --font-body: 'Inter', 'SF Pro Display', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            --font-mono: 'SF Mono', 'JetBrains Mono', 'Consolas', 'Monaco', monospace;
            --radius-card: 6px;
            --radius-btn: 4px;
            --radius-sm: 3px;
            --shadow-card-hover: 0 8px 24px rgba(26, 29, 39, 0.08);
            --shadow-drawer: 0 12px 40px rgba(18, 20, 28, 0.35);
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-bounce: 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
            --nav-width-desktop: 72px;
            --nav-width-tablet: 60px;
            --nav-height-mobile: 56px;
            --container-max: 1320px;
            --section-gap-desktop: 140px;
            --section-gap-mobile: 70px;
            --card-gutter-desktop: 24px;
            --card-gutter-mobile: 16px;
            --body-font-size: 16px;
            --body-line-height: 1.75;
            --h1-size-desktop: 52px;
            --h1-size-mobile: 30px;
            --h2-size: 28px;
            --h3-size: 18px;
        }

        /* ============ RESET & BASE ============ */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            text-rendering: optimizeLegibility;
        }

        body {
            margin: 0;
            padding: 0;
            font-family: var(--font-body);
            font-size: var(--body-font-size);
            line-height: var(--body-line-height);
            color: var(--color-text-body);
            background-color: var(--color-bg-warm);
            overflow-x: hidden;
            -webkit-tap-highlight-color: transparent;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }
        a:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 3px;
            border-radius: var(--radius-sm);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
            padding: 0;
            transition: all var(--transition-smooth);
        }
        button:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 3px;
            border-radius: var(--radius-sm);
        }
        input,
        textarea {
            font-family: inherit;
        }
        ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            margin: 0;
            font-weight: 600;
            line-height: 1.25;
            color: var(--color-primary);
        }
        p {
            margin: 0 0 0.75em;
            max-width: 76ch;
        }
        p:last-child {
            margin-bottom: 0;
        }

        /* ============ OVERRIDE FOUNDATION DEFAULTS ============ */
        .grid-container {
            max-width: var(--container-max);
            padding-left: 20px;
            padding-right: 20px;
        }
        .grid-x {
            margin-left: -12px;
            margin-right: -12px;
        }
        .grid-x>.cell {
            padding-left: 12px;
            padding-right: 12px;
        }
        @media (min-width: 1024px) {
            .grid-x {
                margin-left: -12px;
                margin-right: -12px;
            }
            .grid-x>.cell {
                padding-left: 12px;
                padding-right: 12px;
            }
        }
        .button {
            font-family: var(--font-body);
            font-weight: 500;
            border-radius: var(--radius-btn);
            transition: all var(--transition-smooth);
            letter-spacing: 0.01em;
            cursor: pointer;
            padding: 13px 28px;
            font-size: 15px;
            line-height: 1.4;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            text-decoration: none;
            border: 1px solid transparent;
        }
        .button.primary-btn {
            background-color: var(--color-primary);
            color: var(--color-text-bright);
            border-color: var(--color-primary);
        }
        .button.primary-btn:hover,
        .button.primary-btn:focus-visible {
            background-color: var(--color-accent);
            border-color: var(--color-accent);
            color: #FFFFFF;
            transform: scale(1.02);
            box-shadow: 0 4px 16px var(--color-accent-glow);
        }
        .button.secondary-btn {
            background-color: transparent;
            color: var(--color-accent);
            border-color: var(--color-accent);
        }
        .button.secondary-btn:hover,
        .button.secondary-btn:focus-visible {
            background-color: var(--color-accent-light);
            border-color: var(--color-accent);
            color: var(--color-accent);
            transform: scale(1.02);
        }
        .button.ghost-white-btn {
            background-color: transparent;
            color: #FFFFFF;
            border-color: rgba(255, 255, 255, 0.55);
        }
        .button.ghost-white-btn:hover,
        .button.ghost-white-btn:focus-visible {
            background-color: rgba(255, 255, 255, 0.08);
            border-color: #FFFFFF;
            color: #FFFFFF;
            transform: scale(1.02);
        }
        .button.accent-fill-btn {
            background-color: var(--color-accent);
            color: var(--color-primary);
            border-color: var(--color-accent);
            font-weight: 600;
        }
        .button.accent-fill-btn:hover,
        .button.accent-fill-btn:focus-visible {
            background-color: #B8955F;
            border-color: #B8955F;
            color: #0E1016;
            transform: scale(1.02);
            box-shadow: 0 6px 20px rgba(166, 139, 91, 0.3);
        }

        /* ============ APP SHELL - DESKTOP LEFT NAV ============ */
        .app-shell {
            position: fixed;
            left: 0;
            top: 0;
            bottom: 0;
            width: var(--nav-width-desktop);
            background-color: var(--color-bg-nav);
            border-right: 1px solid var(--color-border-nav);
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 20px 0 24px;
            z-index: 1000;
            transition: width var(--transition-smooth);
        }
        .app-shell-logo {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 6px;
            margin-bottom: 36px;
            text-decoration: none;
            flex-shrink: 0;
        }
        .app-shell-logo .logo-mark {
            width: 36px;
            height: 36px;
            background-color: var(--color-primary);
            clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-accent);
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 13px;
            letter-spacing: 0.04em;
            line-height: 1;
            transition: all var(--transition-smooth);
            flex-shrink: 0;
        }
        .app-shell-logo:hover .logo-mark {
            background-color: var(--color-accent);
            color: #FFFFFF;
            transform: rotate(6deg) scale(1.06);
        }
        .app-shell-logo .logo-text {
            font-size: 10px;
            font-weight: 600;
            color: var(--color-primary);
            letter-spacing: 0.06em;
            text-align: center;
            line-height: 1.3;
            font-family: var(--font-heading);
        }
        .app-shell-nav {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 8px;
            flex: 1;
        }
        .app-shell-nav .nav-icon-link {
            width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            color: var(--color-text-light);
            font-size: 18px;
            position: relative;
            transition: all var(--transition-smooth);
            text-decoration: none;
            flex-shrink: 0;
        }
        .app-shell-nav .nav-icon-link:hover {
            color: var(--color-accent);
            background-color: var(--color-accent-light);
        }
        .app-shell-nav .nav-icon-link.active {
            color: var(--color-accent);
        }
        .app-shell-nav .nav-icon-link.active::before {
            content: '';
            position: absolute;
            left: -10px;
            top: 50%;
            transform: translateY(-50%);
            width: 2px;
            height: 20px;
            background-color: var(--color-accent);
            border-radius: 1px;
        }
        .app-shell-nav .nav-icon-link i {
            transition: transform var(--transition-bounce);
        }
        .app-shell-nav .nav-icon-link:hover i {
            transform: translateY(-1px);
        }
        .app-shell-bottom {
            flex-shrink: 0;
            font-size: 10px;
            color: var(--color-text-muted);
            letter-spacing: 0.04em;
            text-align: center;
            opacity: 0.6;
        }

        /* ============ MAIN CONTENT AREA ============ */
        .main-content {
            margin-left: var(--nav-width-desktop);
            min-height: 100vh;
            transition: margin-left var(--transition-smooth);
        }
        .content-container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding-left: 32px;
            padding-right: 32px;
        }

        /* ============ HERO SECTION ============ */
        .hero-section {
            padding: 140px 0 130px;
            position: relative;
            overflow: hidden;
            background-color: var(--color-bg-warm);
        }
        .hero-section::after {
            content: '';
            position: absolute;
            right: -80px;
            top: 50%;
            transform: translateY(-50%);
            width: 420px;
            height: 420px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(166, 139, 91, 0.06) 0%, transparent 70%);
            pointer-events: none;
        }
        .hero-inner {
            max-width: 680px;
            position: relative;
            z-index: 1;
        }
        .hero-badge {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.1em;
            text-transform: uppercase;
            color: var(--color-accent);
            background-color: var(--color-accent-light);
            padding: 6px 14px;
            border-radius: 20px;
            margin-bottom: 24px;
            font-family: var(--font-body);
        }
        .hero-title {
            font-family: var(--font-heading);
            font-size: var(--h1-size-desktop);
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: -0.02em;
            line-height: 1.18;
            margin-bottom: 20px;
            max-width: 620px;
            animation: heroFadeUp 0.8s cubic-bezier(0.22, 1, 0.36, 1) both;
        }
        @keyframes heroFadeUp {
            from {
                opacity: 0;
                transform: translateY(18px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .hero-subtitle {
            font-size: 18px;
            color: var(--color-text-muted);
            line-height: 1.7;
            margin-bottom: 36px;
            max-width: 520px;
            animation: heroFadeUp 0.8s 0.12s cubic-bezier(0.22, 1, 0.36, 1) both;
        }
        .hero-actions {
            display: flex;
            align-items: center;
            gap: 18px;
            flex-wrap: wrap;
            animation: heroFadeUp 0.8s 0.22s cubic-bezier(0.22, 1, 0.36, 1) both;
        }
        .hero-scroll-link {
            font-size: 15px;
            color: var(--color-accent);
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: gap var(--transition-smooth);
            text-decoration: none;
        }
        .hero-scroll-link:hover {
            gap: 10px;
            color: #8C7345;
        }
        .hero-scroll-link i {
            font-size: 13px;
            transition: transform var(--transition-smooth);
        }
        .hero-scroll-link:hover i {
            transform: translateX(3px);
        }

        /* ============ SECTION COMMONS ============ */
        .section-block {
            padding: var(--section-gap-desktop) 0;
        }
        .section-header {
            margin-bottom: 56px;
        }
        .section-label {
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.1em;
            text-transform: uppercase;
            color: var(--color-accent);
            margin-bottom: 10px;
            font-family: var(--font-body);
        }
        .section-title {
            font-family: var(--font-heading);
            font-size: var(--h2-size);
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: -0.01em;
            line-height: 1.3;
        }

        /* ============ ABILITY SECTION ============ */
        .ability-section {
            background-color: #FFFFFF;
            padding: var(--section-gap-desktop) 0;
        }
        .ability-row {
            display: flex;
            align-items: stretch;
            gap: 0;
            margin-bottom: 48px;
            border-radius: var(--radius-card);
            overflow: hidden;
            background: #FFFFFF;
            border: 1px solid var(--color-border-subtle);
            transition: all var(--transition-smooth);
        }
        .ability-row:last-child {
            margin-bottom: 0;
        }
        .ability-row:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: rgba(166, 139, 91, 0.18);
        }
        .ability-row.reverse {
            flex-direction: row-reverse;
        }
        .ability-visual {
            flex: 0 0 48%;
            min-height: 340px;
            background-color: #EEECE6;
            position: relative;
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .ability-visual img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            position: absolute;
            inset: 0;
            transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
        }
        .ability-row:hover .ability-visual img {
            transform: scale(1.04);
        }
        .ability-visual-placeholder {
            width: 100%;
            height: 100%;
            background-color: #EEECE6;
            background-image: radial-gradient(circle, rgba(26, 29, 39, 0.03) 1px, transparent 1px);
            background-size: 20px 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #C5C1B5;
            font-size: 48px;
        }
        .ability-text {
            flex: 1;
            padding: 48px 44px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .ability-text .ability-icon {
            font-size: 28px;
            color: var(--color-accent);
            margin-bottom: 16px;
            display: inline-block;
            width: 48px;
            height: 48px;
            line-height: 48px;
            text-align: center;
            background: var(--color-accent-light);
            border-radius: var(--radius-sm);
        }
        .ability-text h3 {
            font-family: var(--font-heading);
            font-size: 22px;
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: 10px;
            letter-spacing: -0.01em;
        }
        .ability-text p {
            color: var(--color-text-muted);
            font-size: 15px;
            line-height: 1.7;
            margin-bottom: 6px;
            max-width: 58ch;
        }
        .ability-text .ability-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 500;
            color: var(--color-accent);
            margin-top: 8px;
            transition: gap var(--transition-smooth);
            text-decoration: none;
        }
        .ability-text .ability-link:hover {
            gap: 10px;
            color: #8C7345;
        }
        .ability-text .ability-link i {
            font-size: 12px;
            transition: transform var(--transition-smooth);
        }
        .ability-text .ability-link:hover i {
            transform: translateX(3px);
        }

        /* ============ SCENARIOS SECTION ============ */
        .scenarios-section {
            background-color: var(--color-bg-warm);
            padding: var(--section-gap-desktop) 0;
        }
        .scenarios-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--card-gutter-desktop);
        }
        .scenario-card {
            background: #FFFFFF;
            border: 1px solid var(--color-border-subtle);
            border-radius: var(--radius-card);
            overflow: hidden;
            transition: all var(--transition-smooth);
            cursor: default;
        }
        .scenario-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-card-hover);
            border-color: rgba(166, 139, 91, 0.2);
        }
        .scenario-card-image {
            position: relative;
            aspect-ratio: 16 / 9;
            background-color: #EEECE6;
            overflow: hidden;
        }
        .scenario-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
        }
        .scenario-card:hover .scenario-card-image img {
            transform: scale(1.05);
        }
        .scenario-card-body {
            padding: 24px 22px 28px;
        }
        .scenario-card-body h3 {
            font-family: var(--font-heading);
            font-size: var(--h3-size);
            font-weight: 700;
            color: var(--color-primary);
            margin-bottom: 8px;
            letter-spacing: -0.005em;
        }
        .scenario-card-body p {
            font-size: 14px;
            color: var(--color-text-muted);
            line-height: 1.65;
            margin: 0;
        }

        /* ============ CASES SECTION ============ */
        .cases-section {
            background-color: var(--color-bg-dark);
            padding: var(--section-gap-desktop) 0;
        }
        .cases-section .section-label {
            color: var(--color-accent);
        }
        .cases-section .section-title {
            color: var(--color-text-bright);
        }
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--card-gutter-desktop);
        }
        .case-stat-card {
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-card);
            padding: 36px 32px;
            transition: all var(--transition-smooth);
            cursor: default;
            position: relative;
            overflow: hidden;
        }
        .case-stat-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 3px;
            height: 0;
            background: var(--color-accent);
            transition: height 0.4s cubic-bezier(0.22, 1, 0.36, 1);
        }
        .case-stat-card:hover::before {
            height: 100%;
        }
        .case-stat-card:hover {
            background: rgba(255, 255, 255, 0.06);
            border-color: rgba(166, 139, 91, 0.3);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
        }
        .case-stat-number {
            font-family: var(--font-mono);
            font-size: 48px;
            font-weight: 700;
            color: var(--color-accent);
            letter-spacing: -0.02em;
            line-height: 1;
            margin-bottom: 8px;
            font-variant-numeric: tabular-nums;
            tab-size: 4;
        }
        .case-stat-label {
            display: inline-block;
            font-size: 11px;
            font-weight: 600;
            letter-spacing: 0.09em;
            text-transform: uppercase;
            color: #8A8D93;
            background: rgba(255, 255, 255, 0.06);
            padding: 4px 10px;
            border-radius: 3px;
            margin-bottom: 14px;
        }
        .case-stat-quote {
            font-size: 14px;
            color: #B9BCC3;
            line-height: 1.6;
            font-style: italic;
            margin: 0;
        }

        /* ============ FAQ SECTION ============ */
        .faq-section {
            background-color: #FFFFFF;
            padding: var(--section-gap-desktop) 0;
        }
        .faq-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 0 40px;
        }
        .faq-item {
            border-top: 1px solid var(--color-faq-border);
            padding: 0;
        }
        .faq-item:last-child {
            border-bottom: 1px solid var(--color-faq-border);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            padding: 18px 0;
            font-size: 16px;
            font-weight: 600;
            color: var(--color-primary);
            text-align: left;
            cursor: pointer;
            background: none;
            border: none;
            gap: 12px;
            transition: color var(--transition-fast);
            font-family: var(--font-body);
            letter-spacing: 0.005em;
        }
        .faq-question:hover {
            color: var(--color-accent);
        }
        .faq-icon {
            flex-shrink: 0;
            width: 20px;
            height: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            font-weight: 300;
            color: var(--color-text-light);
            transition: all var(--transition-smooth);
            line-height: 1;
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            color: var(--color-accent);
        }
        .faq-answer-wrapper {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s cubic-bezier(0.22, 1, 0.36, 1), padding 0.4s cubic-bezier(0.22, 1, 0.36, 1);
            position: relative;
        }
        .faq-item.open .faq-answer-wrapper {
            max-height: 300px;
        }
        .faq-answer-inner {
            padding: 0 0 22px 0;
            position: relative;
            padding-left: 16px;
            border-left: 3px solid transparent;
            transition: border-color 0.35s ease;
        }
        .faq-item.open .faq-answer-inner {
            border-left-color: var(--color-accent);
        }
        .faq-answer-inner p {
            font-size: 15px;
            color: #4A4D55;
            line-height: 1.7;
            margin: 0;
        }

        /* ============ DARK CTA SECTION ============ */
        .dark-cta-section {
            background-color: var(--color-primary);
            padding: 100px 0;
            text-align: center;
        }
        .dark-cta-inner {
            max-width: 640px;
            margin: 0 auto;
        }
        .dark-cta-title {
            font-family: var(--font-heading);
            font-size: 30px;
            font-weight: 700;
            color: var(--color-accent);
            margin-bottom: 16px;
            letter-spacing: -0.01em;
        }
        .dark-cta-body {
            font-size: 16px;
            color: #B9BCC3;
            margin-bottom: 36px;
            line-height: 1.7;
        }
        .dark-cta-actions {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ============ FOOTER ============ */
        .site-footer {
            background-color: var(--color-footer-bg);
            padding: 64px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 48px;
        }
        .footer-col h4 {
            font-size: 12px;
            font-weight: 700;
            letter-spacing: 0.09em;
            text-transform: uppercase;
            color: var(--color-primary);
            margin-bottom: 18px;
            font-family: var(--font-body);
        }
        .footer-col p {
            font-size: 14px;
            color: var(--color-text-muted);
            line-height: 1.7;
        }
        .footer-col .footer-links {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-col .footer-links a {
            font-size: 14px;
            color: var(--color-text-muted);
            transition: color var(--transition-fast);
            text-decoration: none;
        }
        .footer-col .footer-links a:hover {
            color: var(--color-accent);
        }
        .footer-contact-item {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            margin-bottom: 10px;
            font-size: 14px;
            color: var(--color-text-muted);
            line-height: 1.6;
        }
        .footer-contact-item i {
            color: var(--color-accent);
            font-size: 14px;
            margin-top: 3px;
            flex-shrink: 0;
            width: 16px;
            text-align: center;
        }
        .footer-bottom {
            border-top: 1px solid #DDDAD3;
            padding: 20px 0;
            text-align: center;
            font-size: 13px;
            color: var(--color-text-muted);
            letter-spacing: 0.02em;
        }
        .footer-bottom .footer-brand {
            font-weight: 600;
            color: var(--color-primary);
        }

        /* ============ MOBILE TOP BAR ============ */
        .mobile-topbar {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--nav-height-mobile);
            background-color: var(--color-bg-nav);
            border-bottom: 1px solid var(--color-border-nav);
            z-index: 1001;
            align-items: center;
            justify-content: space-between;
            padding: 0 16px;
        }
        .mobile-topbar-logo {
            display: flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
        }
        .mobile-topbar-logo .logo-mark-sm {
            width: 28px;
            height: 28px;
            background-color: var(--color-primary);
            clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-accent);
            font-weight: 700;
            font-size: 10px;
            font-family: var(--font-heading);
            flex-shrink: 0;
        }
        .mobile-topbar-logo span {
            font-weight: 600;
            font-size: 14px;
            color: var(--color-primary);
            font-family: var(--font-heading);
            letter-spacing: 0.03em;
        }
        .mobile-hamburger {
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--color-primary);
            cursor: pointer;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
            flex-shrink: 0;
        }
        .mobile-hamburger:hover {
            background: var(--color-accent-light);
        }

        /* ============ MOBILE DRAWER ============ */
        .mobile-drawer-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(18, 20, 28, 0.7);
            z-index: 999;
            opacity: 0;
            transition: opacity var(--transition-smooth);
            pointer-events: none;
        }
        .mobile-drawer-overlay.open {
            display: block;
            opacity: 1;
            pointer-events: auto;
        }
        .mobile-drawer {
            position: fixed;
            top: 0;
            left: -280px;
            width: 260px;
            height: 100vh;
            background: var(--color-bg-nav);
            z-index: 1002;
            padding: 24px 20px;
            display: flex;
            flex-direction: column;
            gap: 6px;
            transition: left var(--transition-smooth);
            box-shadow: var(--shadow-drawer);
            overflow-y: auto;
        }
        .mobile-drawer.open {
            left: 0;
        }
        .mobile-drawer-close {
            align-self: flex-end;
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: var(--color-primary);
            cursor: pointer;
            border-radius: var(--radius-sm);
            margin-bottom: 16px;
            transition: background var(--transition-fast);
        }
        .mobile-drawer-close:hover {
            background: var(--color-accent-light);
        }
        .mobile-drawer-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 13px 16px;
            font-size: 15px;
            font-weight: 500;
            color: var(--color-primary);
            border-radius: var(--radius-sm);
            transition: all var(--transition-fast);
            text-decoration: none;
        }
        .mobile-drawer-nav a i {
            width: 20px;
            text-align: center;
            color: var(--color-text-light);
            font-size: 15px;
            transition: color var(--transition-fast);
        }
        .mobile-drawer-nav a:hover {
            background: var(--color-accent-light);
            color: var(--color-accent);
        }
        .mobile-drawer-nav a:hover i {
            color: var(--color-accent);
        }
        .mobile-drawer-nav a.active {
            color: var(--color-accent);
            background: var(--color-accent-light);
        }
        .mobile-drawer-nav a.active i {
            color: var(--color-accent);
        }

        /* ============ RESPONSIVE BREAKPOINTS ============ */
        @media (max-width: 1024px) {
            .app-shell {
                width: var(--nav-width-tablet);
            }
            .app-shell-logo .logo-mark {
                width: 30px;
                height: 30px;
                font-size: 10px;
            }
            .app-shell-logo .logo-text {
                font-size: 9px;
            }
            .app-shell-nav .nav-icon-link {
                width: 38px;
                height: 38px;
                font-size: 16px;
            }
            .app-shell-nav .nav-icon-link.active::before {
                left: -6px;
                height: 16px;
            }
            .main-content {
                margin-left: var(--nav-width-tablet);
            }
            .content-container {
                padding-left: 24px;
                padding-right: 24px;
            }
            .hero-section {
                padding: 110px 0 100px;
            }
            .hero-title {
                font-size: 40px;
            }
            .section-block {
                padding: 100px 0;
            }
            .ability-visual {
                flex: 0 0 44%;
                min-height: 280px;
            }
            .ability-text {
                padding: 36px 28px;
            }
            .scenarios-grid {
                gap: 16px;
            }
            .cases-grid {
                gap: 16px;
            }
            .case-stat-number {
                font-size: 38px;
            }
            .faq-grid {
                gap: 0 24px;
            }
        }
        @media (max-width: 768px) {
            .scenarios-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 14px;
            }
            .cases-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .faq-grid {
                grid-template-columns: 1fr;
                gap: 0;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .ability-visual {
                flex: 0 0 40%;
                min-height: 240px;
            }
            .ability-text {
                padding: 28px 20px;
            }
            .ability-text h3 {
                font-size: 19px;
            }
            .section-block {
                padding: 70px 0;
            }
            .hero-section {
                padding: 90px 0 80px;
            }
            .hero-title {
                font-size: 34px;
            }
            .hero-subtitle {
                font-size: 16px;
            }
            .dark-cta-title {
                font-size: 24px;
            }
        }
        @media (max-width: 640px) {
            .app-shell {
                display: none;
            }
            .mobile-topbar {
                display: flex;
            }
            .mobile-drawer-overlay {
                display: none;
            }
            .mobile-drawer-overlay.open {
                display: block;
            }
            .main-content {
                margin-left: 0;
                padding-top: var(--nav-height-mobile);
            }
            .content-container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .hero-section {
                padding: 60px 0 56px;
            }
            .hero-title {
                font-size: var(--h1-size-mobile);
                letter-spacing: -0.015em;
            }
            .hero-subtitle {
                font-size: 15px;
                margin-bottom: 28px;
            }
            .hero-actions {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
            }
            .hero-badge {
                font-size: 11px;
                padding: 5px 12px;
            }
            .section-block {
                padding: var(--section-gap-mobile) 0;
            }
            .section-header {
                margin-bottom: 32px;
            }
            .section-title {
                font-size: 22px;
            }
            .ability-row {
                flex-direction: column !important;
                margin-bottom: 24px;
            }
            .ability-visual {
                flex: none;
                width: 100%;
                min-height: 220px;
                max-height: 260px;
            }
            .ability-text {
                padding: 24px 18px;
            }
            .ability-text h3 {
                font-size: 18px;
            }
            .scenarios-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .cases-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .case-stat-number {
                font-size: 36px;
            }
            .case-stat-card {
                padding: 28px 22px;
            }
            .faq-grid {
                grid-template-columns: 1fr;
            }
            .faq-question {
                font-size: 15px;
                padding: 16px 0;
            }
            .dark-cta-section {
                padding: 64px 0;
            }
            .dark-cta-title {
                font-size: 22px;
            }
            .dark-cta-actions {
                flex-direction: column;
                gap: 12px;
            }
            .dark-cta-actions .button {
                width: 100%;
                justify-content: center;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .site-footer {
                padding: 44px 0 0;
            }
            .footer-grid {
                padding-bottom: 32px;
            }
        }
        @media (max-width: 400px) {
            .hero-title {
                font-size: 26px;
            }
            .hero-subtitle {
                font-size: 14px;
            }
            .button {
                padding: 11px 20px;
                font-size: 14px;
            }
            .ability-visual {
                min-height: 180px;
                max-height: 200px;
            }
            .case-stat-number {
                font-size: 30px;
            }
        }