:root {
            --ink-900: #0d1b2a;
            --ink-700: #334155;
            --ink-500: #64748b;
            --surface-100: #f8fafc;
            --surface-200: #eef2ff;
            --white: #ffffff;
            --brand-700: #1e2d8f;
            --brand-600: #2a3db8;
            --accent-500: #f6bd19;
            --accent-600: #dca915;
            --success-500: #1f9d57;
            --border: #e2e8f0;
            --radius-sm: 12px;
            --radius-md: 18px;
            --radius-lg: 24px;
            --shadow-soft: 0 20px 40px rgba(15, 23, 42, 0.08);
            --shadow-card: 0 12px 28px rgba(15, 23, 42, 0.10);
            --transition: 240ms ease;
        }

        * { box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            margin: 0;
            font-family: 'Outfit', sans-serif;
            color: var(--ink-900);
            background: linear-gradient(180deg, #ffffff 0%, #f8fbff 45%, #f7fafc 100%);
            line-height: 1.6;
        }
        img { max-width: 100%; display: block; }
        h1, h2, h3 { margin: 0; line-height: 1.15; letter-spacing: -0.02em; }
        p { margin: 0; color: var(--ink-700); }
        a { color: inherit; text-decoration: none; }
        .container { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
        .section { padding: 88px 0; }

        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 0.78rem;
            font-weight: 800;
            text-transform: uppercase;
            letter-spacing: 0.12em;
            color: var(--brand-600);
            margin-bottom: 14px;
        }
        .eyebrow::before {
            content: '';
            width: 28px;
            height: 2px;
            border-radius: 2px;
            background: var(--accent-500);
        }
        .section-title {
            font-family: 'Outfit', sans-serif;
            font-size: clamp(1.9rem, 2.6vw, 2.8rem);
            color: var(--ink-900);
            margin-bottom: 14px;
        }
        .section-subtitle { max-width: 700px; font-size: 1.04rem; }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            border: 1px solid transparent;
            border-radius: 999px;
            padding: 14px 24px;
            font-weight: 700;
            font-size: 0.95rem;
            transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition), color var(--transition), border-color var(--transition);
            cursor: pointer;
        }
        .btn:focus-visible { outline: 3px solid rgba(42, 61, 184, 0.25); outline-offset: 2px; }
        .btn-primary {
            background: linear-gradient(180deg, var(--accent-500), #efb70a);
            color: var(--ink-900);
            box-shadow: 0 10px 24px rgba(246, 189, 25, 0.32);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 14px 26px rgba(246, 189, 25, 0.38);
            background: linear-gradient(180deg, #ffcb38, var(--accent-500));
        }
        .btn-ghost { border-color: rgba(255, 255, 255, 0.34); color: #ffffff; background: rgba(255, 255, 255, 0.06); }
        .btn-ghost:hover { background: rgba(255, 255, 255, 0.12); transform: translateY(-2px); }

        .header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.88);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(148, 163, 184, 0.18);
            transition: box-shadow var(--transition);
        }
        .header.scrolled { box-shadow: 0 6px 24px rgba(15, 23, 42, 0.08); }
        .nav-wrap {
            height: 78px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
        }
        .brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 800; letter-spacing: -0.01em; }
        .brand img { width: 46px; height: 46px; border-radius: 10px; }
        .brand span { font-family: 'Outfit', sans-serif; font-size: 1.26rem; color: var(--ink-900); }

        .menu-toggle {
            display: none;
            width: 42px;
            height: 42px;
            border-radius: 10px;
            border: 1px solid var(--border);
            background: #fff;
            color: var(--ink-900);
            cursor: pointer;
        }

        .menu { display: flex; align-items: center; gap: 22px; }
        .menu a { color: var(--ink-700); font-weight: 700; font-size: 0.92rem; position: relative; }
        .menu a::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -6px;
            width: 0;
            height: 2px;
            border-radius: 2px;
            background: var(--brand-600);
            transition: width var(--transition);
        }
        .menu a:hover::after,
        .menu a:focus-visible::after { width: 100%; }
        .nav-cta { margin-left: 4px; }

        .hero {
            position: relative;
            padding: 84px 0 42px;
            overflow: hidden;
            background: linear-gradient(135deg, #0d1b2a 0%, #1e2d8f 48%, #0d1b2a 100%);
            color: #ffffff;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            z-index: 0;
            pointer-events: none;
        }
        .hero-bg-slide {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            opacity: 0;
            transform: scale(1.04);
            transition: opacity 1100ms ease, transform 7000ms ease;
        }
        .hero-bg-slide-1 {
            background-image: url("https://images.unsplash.com/photo-1768556593083-fbcdef8c1e4a?auto=format&fit=crop&fm=jpg&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&ixlib=rb-4.1.0&q=60&w=3000");
        }
        .hero-bg-slide-2 {
            background-image: url("https://images.unsplash.com/photo-1722695694560-f452b0919d3a?auto=format&fit=crop&fm=jpg&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&ixlib=rb-4.1.0&q=60&w=3000");
        }
        .hero-bg-slide-3 {
            background-image: url("https://images.unsplash.com/photo-1761807299731-da9bbef44b77?auto=format&fit=crop&fm=jpg&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&ixlib=rb-4.1.0&q=60&w=3000");
        }
        .hero-bg-slide-4 {
            background-image: url("https://images.unsplash.com/photo-1528323273322-d81458248d40?auto=format&fit=crop&fm=jpg&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&ixlib=rb-4.1.0&q=60&w=3000");
        }
        .hero-bg-slide::after {
            content: '';
            position: absolute;
            inset: 0;
            background:
                linear-gradient(120deg, rgba(6, 12, 35, 0.78) 0%, rgba(14, 28, 84, 0.65) 44%, rgba(8, 13, 32, 0.66) 100%),
                radial-gradient(circle at 84% 22%, rgba(246, 189, 25, 0.18), transparent 30%);
        }
        .hero-bg-slide.active {
            opacity: 1;
            transform: scale(1);
        }
        .hero::before,
        .hero::after {
            content: '';
            position: absolute;
            border-radius: 999px;
            pointer-events: none;
        }
        .hero::before {
            width: 360px;
            height: 360px;
            right: -80px;
            top: -120px;
            background: rgba(255, 255, 255, 0.08);
        }
        .hero::after {
            width: 220px;
            height: 220px;
            left: -60px;
            bottom: -70px;
            background: rgba(246, 189, 25, 0.15);
        }
        .hero-grid {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 40px;
            align-items: center;
        }
        .hero h1 {
            font-family: 'Outfit', sans-serif;
            font-size: clamp(2.3rem, 5vw, 4.3rem);
            margin-bottom: 18px;
        }
        .hero h1 .highlight { color: var(--accent-500); }
        .hero p {
            color: rgba(255, 255, 255, 0.88);
            font-size: 1.06rem;
            max-width: 620px;
            margin-bottom: 28px;
        }
        .hero .eyebrow {
            color: var(--accent-500);
        }
        .hero .eyebrow::before {
            background: rgba(255, 255, 255, 0.85);
        }
        .hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
        .hero-points {
            margin-top: 24px;
            display: flex;
            flex-wrap: wrap;
            gap: 18px;
            color: rgba(255, 255, 255, 0.92);
            font-size: 0.92rem;
            font-weight: 600;
        }
        .hero-points span { display: inline-flex; align-items: center; gap: 8px; }
        .hero-points i { color: var(--accent-500); }

        .hero-card {
            background: rgba(255, 255, 255, 0.11);
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: var(--radius-lg);
            padding: 24px;
            box-shadow: var(--shadow-soft);
            backdrop-filter: blur(6px);
        }
        .hero-card h3 { color: #ffffff; font-size: 1.05rem; margin-bottom: 16px; }
        .hero-stat-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
        .hero-stat { background: rgba(255, 255, 255, 0.10); border-radius: var(--radius-sm); padding: 14px; min-height: 86px; }
        .hero-stat strong { display: block; font-size: 1.5rem; color: var(--accent-500); margin-bottom: 4px; }
        .hero-stat span { font-size: 0.83rem; color: rgba(255, 255, 255, 0.92); }

        .trust-strip { margin-top: -28px; position: relative; z-index: 4; }
        .trust-box {
            background: #ffffff;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-soft);
            border: 1px solid #e2e8f0;
            padding: 20px;
            display: grid;
            grid-template-columns: repeat(4, minmax(0, 1fr));
            gap: 16px;
        }
        .trust-item {
            text-align: center;
            padding: 12px;
            border-radius: var(--radius-sm);
            transition: transform var(--transition), background-color var(--transition);
        }
        .trust-item:hover { background: var(--surface-100); transform: translateY(-2px); }
        .trust-item i { font-size: 1.5rem; color: var(--brand-600); margin-bottom: 10px; }
        .trust-item h4 { margin: 0 0 4px; font-size: 1rem; }
        .trust-item p { font-size: 0.85rem; color: var(--ink-500); }

        .grid-3 {
            margin-top: 38px;
            display: grid;
            grid-template-columns: repeat(3, minmax(0, 1fr));
            gap: 22px;
        }
        .card {
            background: #ffffff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 26px;
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
        }
        .card:hover {
            transform: translateY(-6px);
            border-color: #cbd5e1;
            box-shadow: var(--shadow-card);
        }
        .step {
            width: 44px;
            height: 44px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 12px;
            background: var(--surface-200);
            color: var(--brand-600);
            font-weight: 800;
            margin-bottom: 16px;
        }
        .card h3 { font-size: 1.22rem; margin-bottom: 10px; }

        .benefits { background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%); }
        .benefit-grid {
            margin-top: 38px;
            display: grid;
            grid-template-columns: repeat(2, minmax(0, 1fr));
            gap: 20px;
        }
        .benefit-item {
            display: flex;
            align-items: flex-start;
            gap: 14px;
            background: #ffffff;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 20px;
        }
        .benefit-item i { color: var(--success-500); margin-top: 2px; }
        .benefit-item h4 { margin: 0 0 6px; font-size: 1rem; }
        .benefit-item p { font-size: 0.9rem; }

        .categories {
            background: linear-gradient(135deg, #0d1b2a 0%, #1a2f46 100%);
            color: #ffffff;
        }
        .categories .section-title,
        .categories .section-subtitle {
            color: #ffffff;
        }
        .categories .section-subtitle {
            opacity: 0.9;
        }
        .categories .eyebrow {
            color: #c7d2fe;
        }
        .recyclable-slider-wrap {
            margin-top: 36px;
            position: relative;
            height: 560px;
            width: 100vw;
            margin-left: calc(50% - 50vw);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-soft);
            border: 1px solid var(--border);
            background: #0d1b2a;
        }
        .category-slider {
            position: relative;
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
            cursor: pointer;
        }
        .category-item {
            width: 200px;
            height: 300px;
            list-style-type: none;
            position: absolute;
            top: 50%;
            left: calc(50% + 440px);
            transform: translateY(-50%);
            z-index: 1;
            background-position: center;
            background-size: cover;
            border-radius: 20px;
            box-shadow: 0 20px 30px rgba(0, 0, 0, 0.24) inset;
            transition: transform 0.1s, left 0.75s, top 0.75s, width 0.75s, height 0.75s, opacity 0.75s;
        }
        .category-paper { background-image: url("../paper.jpg"); }
        .category-metal { background-image: url("../metal.jpg"); }
        .category-plastic { background-image: url("../plastic.jpg"); }
        .category-ewaste { background-image: url("../ewaste.jpg"); }
        .category-item::before {
            content: '';
            position: absolute;
            inset: 0;
            z-index: 0;
        }
        .category-item:nth-child(1),
        .category-item:nth-child(2) {
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            transform: none;
            border-radius: 0;
            box-shadow: none;
            opacity: 1;
            z-index: 1;
        }
        .category-item:nth-child(n+3) {
            z-index: 3;
        }
        .category-item:nth-child(3) { left: 50%; }
        .category-item:nth-child(4) { left: calc(50% + 220px); }
        .category-item:nth-child(5) { left: calc(50% + 440px); }
        .category-item:nth-child(6) { left: calc(50% + 660px); opacity: 0; }
        .category-item-content {
            width: min(34vw, 420px);
            position: absolute;
            top: 50%;
            left: 3rem;
            transform: translateY(-50%);
            color: #ffffff;
            text-shadow: 0 3px 8px rgba(0, 0, 0, 0.5);
            opacity: 0;
            display: none;
            z-index: 4;
            background: rgba(13, 27, 42, 0.72);
            border: 1px solid rgba(255, 255, 255, 0.22);
            backdrop-filter: blur(6px);
            border-radius: 14px;
            padding: 16px 18px;
            max-height: calc(100% - 34px);
            overflow-y: auto;
            text-align: center;
        }
        .category-item-content .title {
            font-size: clamp(1.25rem, 2.2vw, 2rem);
            font-weight: 800;
            margin: 10px;
            text-transform: uppercase;
            letter-spacing: 0.02em;
            color: #ffffff;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.45);
        }
        .category-item-content .description {
            line-height: 1.6;
            margin: 0 0 0.75rem;
            font-size: 0.95rem;
            color: #ecf3ff;
            max-width: 40ch;
            margin-left: auto;
            margin-right: auto;
        }
        .category-item-content .detail-list {
            margin: 0 auto 1rem;
            padding-left: 1.1rem;
            color: #f8fbff;
            font-size: 0.84rem;
            line-height: 1.55;
            max-width: 40ch;
            text-align: left;
            width: fit-content;
        }
        .category-item-content .detail-list li {
            margin-bottom: 0.38rem;
        }
        .category-item-content .meta {
            margin: 0 auto 10px;
            font-size: 0.76rem;
            color: #d4e4ff;
            font-weight: 600;
            letter-spacing: 0.02em;
            text-transform: uppercase;
            text-align: center;
        }
        .category-item-content .chip {
            display: inline-block;
            width: fit-content;
            background-color: rgba(255, 255, 255, 0.12);
            color: #ffffff;
            border: 1px solid rgba(255, 255, 255, 0.75);
            border-radius: 999px;
            padding: 0.55rem 1rem;
            font-size: 0.82rem;
            font-weight: 700;
            margin-bottom: 12px;
            letter-spacing: 0.03em;
            margin-left: auto;
            margin-right: auto;
        }
        .category-item:nth-of-type(2) .category-item-content {
            display: block;
            animation: showCategoryContent 0.75s ease-in-out 0.3s forwards;
        }
        @keyframes showCategoryContent {
            0% {
                filter: blur(5px);
                transform: translateY(calc(-50% + 75px));
            }
            100% {
                opacity: 1;
                filter: blur(0);
            }
        }
        .impact {
            background: linear-gradient(135deg, #0d1b2a 0%, #1e2d8f 100%);
            color: #ffffff;
        }
        .impact .section-title,
        .impact .section-subtitle { color: #ffffff; }
        .impact .section-subtitle { opacity: 0.9; }
        .impact-eyebrow { color: #c7d2fe; }
        .impact-grid {
            margin-top: 34px;
            display: grid;
            grid-template-columns: repeat(4, minmax(0, 1fr));
            gap: 18px;
        }
        .impact-card {
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.18);
            border-radius: var(--radius-sm);
            padding: 22px;
            text-align: center;
        }
        .impact-number {
            display: block;
            font-size: clamp(1.7rem, 2.6vw, 2.5rem);
            font-weight: 800;
            color: var(--accent-500);
            margin-bottom: 6px;
        }
        .impact-label { font-size: 0.88rem; color: rgba(255, 255, 255, 0.92); }

        .faq { background: #ffffff; }
        .faq-wrap {
            margin-top: 32px;
            display: grid;
            gap: 12px;
            max-width: 880px;
        }
        .faq-item {
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            overflow: hidden;
            background: #ffffff;
            transition: box-shadow var(--transition), border-color var(--transition);
        }
        .faq-item.open { border-color: #cbd5e1; box-shadow: var(--shadow-soft); }
        .faq-btn {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            background: transparent;
            border: 0;
            text-align: left;
            padding: 18px 20px;
            font-size: 1rem;
            font-weight: 700;
            color: var(--ink-900);
            cursor: pointer;
        }
        .faq-btn i { transition: transform var(--transition); color: var(--brand-600); }
        .faq-item.open .faq-btn i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition), padding var(--transition);
            padding: 0 20px;
        }
        .faq-item.open .faq-answer { max-height: 180px; padding: 0 20px 18px; }

        .cta {
            padding: 76px 0;
            text-align: center;
            background:
                radial-gradient(circle at 15% 30%, rgba(246, 189, 25, 0.18), transparent 36%),
                radial-gradient(circle at 90% 70%, rgba(42, 61, 184, 0.18), transparent 32%),
                #f8fafc;
        }
        .cta-box {
            border: 1px solid var(--border);
            background: #ffffff;
            border-radius: var(--radius-lg);
            padding: 44px 24px;
            box-shadow: var(--shadow-soft);
        }
        .cta .section-title { margin-bottom: 12px; }
        .cta .section-subtitle { margin: 0 auto 24px; }

        .footer {
            background: #0d1b2a;
            color: #cbd5e1;
            padding: 60px 0 28px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.25fr 1fr 1fr 1fr;
            gap: 24px;
        }
        .footer h4 { color: #ffffff; margin: 0 0 14px; font-size: 1rem; }
        .footer p,
        .footer li,
        .footer a { color: #cbd5e1; font-size: 0.92rem; }
        .footer ul {
            list-style: none;
            padding: 0;
            margin: 0;
            display: grid;
            gap: 8px;
        }
        .footer a:hover { color: var(--accent-500); }
        .social { margin-top: 16px; display: flex; gap: 10px; }
        .social a {
            width: 34px;
            height: 34px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 999px;
            border: 1px solid rgba(203, 213, 225, 0.26);
        }
        .social a:hover { border-color: var(--accent-500); }

        .copyright {
            margin-top: 36px;
            padding-top: 20px;
            border-top: 1px solid rgba(203, 213, 225, 0.14);
            text-align: center;
            color: #94a3b8;
            font-size: 0.85rem;
        }

        .reveal {
            opacity: 0;
            transform: translateY(18px);
            transition: opacity 500ms ease, transform 500ms ease;
        }
        .reveal.show { opacity: 1; transform: translateY(0); }

        @media (max-width: 1080px) {
            .hero-grid { grid-template-columns: 1fr; }
            .grid-3,
            .impact-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
            .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
        }

        @media (max-width: 820px) {
            .menu-toggle { display: inline-flex; align-items: center; justify-content: center; }
            .menu {
                position: absolute;
                left: 20px;
                right: 20px;
                top: 78px;
                background: #ffffff;
                border: 1px solid var(--border);
                border-radius: var(--radius-md);
                box-shadow: var(--shadow-soft);
                display: grid;
                gap: 4px;
                padding: 14px;
                transform: translateY(-8px);
                opacity: 0;
                pointer-events: none;
                transition: var(--transition);
            }
            .menu.open { opacity: 1; transform: translateY(0); pointer-events: auto; }
            .menu a { padding: 10px 8px; border-radius: 10px; }
            .menu a:hover { background: var(--surface-100); }
            .nav-cta { display: none; }
            .trust-box { grid-template-columns: repeat(2, minmax(0, 1fr)); }
            .benefit-grid { grid-template-columns: 1fr; }
        }

        @media (max-width: 600px) {
            .container { width: min(1180px, calc(100% - 28px)); }
            .hero { padding-top: 58px; }
            .section { padding: 68px 0; }
            .hero-actions { width: 100%; }
            .hero-actions .btn { flex: 1; min-width: 100%; }
            .trust-box,
            .grid-3,
            .impact-grid,
            .footer-grid,
            .hero-stat-list { grid-template-columns: 1fr; }
            .card,
            .impact-card,
            .benefit-item,
            .cta-box { padding: 18px; }
            .faq-btn { font-size: 0.94rem; }
            .recyclable-slider-wrap {
                height: 520px;
                border-radius: 0;
                border-left: 0;
                border-right: 0;
            }
            .category-item { width: 112px; height: 190px; }
            .category-item:nth-child(3) { left: calc(100% - 126px); opacity: 1; }
            .category-item:nth-child(4) { left: calc(100% - 12px); opacity: 0.92; }
            .category-item:nth-child(5) { left: calc(100% + 104px); opacity: 0.7; }
            .category-item:nth-child(6) { left: calc(100% + 220px); opacity: 0; }
            .category-item-content { width: min(62vw, 300px); left: 0.7rem; }
            .category-item-content .title { font-size: 1rem; }
            .category-item-content .description { font-size: 0.72rem; }
            .category-item-content .detail-list { font-size: 0.68rem; line-height: 1.35; }
            .category-item-content .meta { font-size: 0.63rem; }
            .category-item-content {
                padding: 12px 12px;
                max-height: calc(100% - 18px);
            }
        }
        @media (prefers-reduced-motion: reduce) {
            .hero-bg-slide {
                transition: none;
                transform: none;
            }
        }
        @media (min-width: 651px) and (max-width: 900px) {
            .category-item { width: 160px; height: 270px; }
            .category-item:nth-child(3) { left: 50%; }
            .category-item:nth-child(4) { left: calc(50% + 170px); }
            .category-item:nth-child(5) { left: calc(50% + 340px); }
            .category-item:nth-child(6) { left: calc(50% + 510px); opacity: 0; }
            .category-item-content { width: min(44vw, 360px); }
        }