:root {
            --nav-height: 64px;
            --bg-page: #f5f5f7;
            --bg-card-light: #ffffff;
            --bg-card-dark: #000000;
            --text-primary: #1d1d1f;
            --text-secondary: #86868b;
            --text-light: #ffffff;
            --text-light-secondary: #a1a1a6;
            --accent-orange: #bf4800;
            --accent-blue: #0071e3; /* Apple Blue */
            --accent-violet: #5856d6;
            --nav-bg: rgba(255, 255, 255, 0.8);
            --border-color: #d2d2d7;
            --btn-bg: #e8e8ed;
            --btn-hover: #d2d2d7;
        }

        /* Reset and Base Styles */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-page);
            color: var(--text-primary);
            line-height: 1.5;
            overflow-x: clip;
        }

        body.nav-no-scroll {
            overflow: hidden;
            touch-action: none;
        }

        a {
            text-decoration: none;
            transition: opacity 0.3s ease;
        }

        a:hover {
            opacity: 0.8;
        }

        /* Navbar: desktop row + logo left; mobile menu button + slide-down panel */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--nav-height);
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: saturate(180%) blur(20px);
            -webkit-backdrop-filter: saturate(180%) blur(20px);
            z-index: 1000;
            display: flex;
            justify-content: center;
            border-bottom: 1px solid rgba(0,0,0,0.06);
        }

        .nav-container {
            width: 100%;
            max-width: 1100px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            padding: 0 16px;
        }

        .nav-brand {
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            color: inherit;
        }

        .nav-brand:hover {
            opacity: 1;
        }

        .nav-brand:hover .origami-cat {
            opacity: 1;
            transform: scale(1.05);
        }

        .nav-menu-btn {
            display: none;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            margin: 0;
            padding: 0;
            border: none;
            background: transparent;
            color: rgba(0, 0, 0, 0.85);
            cursor: pointer;
            border-radius: 10px;
            flex-shrink: 0;
            -webkit-tap-highlight-color: transparent;
        }

        .nav-menu-btn:hover {
            background: rgba(0, 0, 0, 0.05);
        }

        .nav-menu-btn .nav-menu-icon {
            font-size: 18px;
        }

        .nav-menu-icon--close {
            display: none;
        }

        .navbar.nav-is-open .nav-menu-icon--open {
            display: none;
        }

        .navbar.nav-is-open .nav-menu-icon--close {
            display: inline-block;
        }

        .nav-backdrop {
            display: none;
        }

        .nav-links {
            display: flex;
            flex-direction: row;
            align-items: center;
            gap: 52px;
            list-style: none;
            height: 100%;
            margin: 0;
            padding: 0;
        }

        .nav-links li {
            height: 100%;
            display: flex;
            align-items: center;
        }

        .nav-links a {
            font-size: 15px;
            font-weight: 400;
            letter-spacing: -0.01em;
            color: rgba(0, 0, 0, 0.8);
            text-decoration: none;
            transition: color 0.3s ease;
            display: flex;
            align-items: center;
            height: 100%;
        }

        .nav-links a:hover {
            color: rgba(0, 0, 0, 1);
            opacity: 1;
        }

        .nav-icon {
            font-size: 18px;
            opacity: 0.85;
            margin-right: 6px;
        }

        .nav-links a .nav-icon {
            margin-right: 0;
        }

        .nav-links a .nav-icon + .nav-lang-label {
            margin-left: 6px;
        }

        .nav-lang .nav-icon {
            margin-right: 0;
        }

        .nav-lang .nav-icon + .nav-lang-label {
            margin-left: 6px;
        }

        .nav-lang {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 15px;
            font-weight: 400;
            letter-spacing: -0.01em;
            color: rgba(0, 0, 0, 0.8);
            text-decoration: none;
            border-radius: 10px;
            min-width: 44px;
            min-height: 44px;
            -webkit-tap-highlight-color: transparent;
            background: none;
            border: none;
            cursor: pointer;
            font-family: inherit;
            padding: 0 8px;
            gap: 6px;
        }

        .nav-lang:hover {
            color: rgba(0, 0, 0, 1);
            opacity: 1;
            background: rgba(0, 0, 0, 0.05);
        }

        /* Language dropdown */
        .nav-lang-wrap {
            position: relative;
            display: inline-flex;
            align-items: center;
        }

        .nav-lang-chevron {
            font-size: 10px;
            transition: transform 0.2s ease;
        }

        .nav-lang-btn[aria-expanded="true"] .nav-lang-chevron {
            transform: rotate(180deg);
        }

        .nav-lang-dropdown {
            position: absolute;
            right: 0;
            top: calc(100% + 8px);
            background: #fff;
            border: 1px solid rgba(0, 0, 0, 0.1);
            border-radius: 12px;
            list-style: none;
            padding: 6px;
            margin: 0;
            min-width: 152px;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(0, 0, 0, 0.06);
            display: none;
            z-index: 1100;
        }

        .nav-lang-btn[aria-expanded="true"] ~ .nav-lang-dropdown {
            display: block;
        }

        .nav-lang-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 9px 14px;
            border-radius: 8px;
            text-decoration: none;
            color: #1d1d1f;
            font-size: 14px;
            white-space: nowrap;
            height: auto;
            min-height: 0;
            transition: background 0.15s;
            opacity: 1;
        }

        .nav-lang-item:hover {
            background: #f5f5f7;
            opacity: 1;
            color: #1d1d1f;
        }

        .nav-lang-item--active {
            font-weight: 600;
            color: var(--accent-blue);
        }

        .nav-lang-item--active::after {
            content: '✓';
            font-size: 12px;
            margin-left: 10px;
        }

        /* Mobile nav: language section (hidden on desktop) */
        .nav-lang-section {
            display: none;
        }

        @media (min-width: 769px) {
            .nav-lang-section {
                display: none !important;
            }
        }

        .origami-cat {
            width: 22px;
            height: 22px;
            display: block;
            object-fit: contain;
            opacity: 0.85;
            transition: opacity 0.3s ease, transform 0.3s ease;
        }

        .nav-links a.nav-link--active {
            color: rgba(0, 0, 0, 1);
            font-weight: 500;
        }

        .nav-brand.nav-link--active .origami-cat {
            opacity: 1;
        }

        @media (min-width: 769px) {
            .nav-container {
                display: grid;
                grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
                align-items: center;
            }

            .nav-brand {
                position: static;
                justify-self: start;
                grid-column: 1;
                grid-row: 1;
            }

            .nav-menu-btn {
                display: none !important;
            }

            .nav-backdrop {
                display: none !important;
            }

            .nav-links {
                grid-column: 2;
                grid-row: 1;
                justify-self: center;
                position: static;
                flex-direction: row;
                width: auto;
                max-height: none;
                overflow: visible;
                background: transparent;
                box-shadow: none;
                border: none;
                padding: 0;
                opacity: 1;
                visibility: visible;
                pointer-events: auto;
                transform: none;
            }

            .nav-links li {
                border-bottom: none;
            }

            .nav-links a {
                width: auto;
                min-height: 0;
                padding: 0;
                justify-content: center;
                font-size: 15px;
            }

            .nav-lang-wrap {
                grid-column: 3;
                grid-row: 1;
                justify-self: end;
            }

            .nav-lang {
                grid-column: unset;
            }

            .nav-lang-label {
                display: none;
            }
        }

        @media (min-width: 1024px) {
            :root {
                --nav-height: 68px;
            }

            .nav-container {
                max-width: 1200px;
            }

            .nav-links {
                gap: 60px;
            }

            .nav-links a {
                font-size: 16px;
            }

            .nav-icon {
                font-size: 20px;
            }

            .nav-menu-btn .nav-menu-icon {
                font-size: 20px;
            }

            .origami-cat {
                width: 26px;
                height: 26px;
            }
        }

        @media (max-width: 768px) {
            .navbar {
                overflow: visible;
                backdrop-filter: none;
                -webkit-backdrop-filter: none;
                background: rgba(255, 255, 255, 0.98);
            }

            .nav-container {
                justify-content: space-between;
                padding-left: max(20px, env(safe-area-inset-left, 0px));
                padding-right: max(20px, env(safe-area-inset-right, 0px));
            }

            .nav-menu-btn {
                display: inline-flex;
                order: 3;
            }

            .nav-brand {
                order: 1;
            }

            .nav-lang-wrap {
                order: 2;
                margin-left: auto;
                margin-right: 2px;
            }

            .nav-lang {
                order: unset;
                margin-left: unset;
                margin-right: unset;
            }

            .nav-lang-label {
                display: none;
            }

            .nav-lang-dropdown {
                right: 0;
                top: calc(100% + 12px);
            }

            .nav-backdrop {
                display: block;
                position: fixed;
                top: var(--nav-height);
                left: 0;
                right: 0;
                bottom: 0;
                background: rgba(0, 0, 0, 0.28);
                z-index: 998;
                opacity: 0;
                visibility: hidden;
                pointer-events: none;
                transition: opacity 0.25s ease, visibility 0.25s;
            }

            .navbar.nav-is-open .nav-backdrop {
                opacity: 1;
                visibility: visible;
                pointer-events: auto;
            }

            .nav-links {
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                width: 100%;
                max-height: min(85vh, calc(100dvh - var(--nav-height)));
                overflow-y: auto;
                -webkit-overflow-scrolling: touch;
                flex-direction: column;
                align-items: stretch;
                align-content: flex-start;
                gap: 0;
                height: auto;
                padding: 8px 0 28px;
                margin: 0;
                background: rgba(255, 255, 255, 0.98);
                border-top: 1px solid rgba(0, 0, 0, 0.08);
                box-shadow: 0 16px 48px rgba(0, 0, 0, 0.12);
                z-index: 999;
                transform: translateY(-8px);
                opacity: 0;
                visibility: hidden;
                pointer-events: none;
                transition: opacity 0.22s ease, visibility 0.22s, transform 0.22s ease;
            }

            .navbar.nav-is-open .nav-links {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
                pointer-events: auto;
            }

            .nav-links li {
                height: auto;
                border-bottom: 1px solid rgba(0, 0, 0, 0.06);
            }

            .nav-links li:last-child {
                border-bottom: none;
            }

            .nav-links a {
                width: 100%;
                min-height: 48px;
                height: auto;
                padding: 14px 20px;
                justify-content: flex-start;
                font-size: 17px;
            }

            /* Language section inside mobile nav panel */
            .nav-lang-wrap {
                display: none !important;
            }

            .nav-links li.nav-lang-section {
                display: block;
                height: auto;
                padding: 14px 20px 20px;
                border-top: 1px solid rgba(0, 0, 0, 0.06);
                border-bottom: none;
            }

            .nav-lang-section-label {
                display: flex;
                align-items: center;
                gap: 6px;
                font-size: 12px;
                font-weight: 500;
                color: var(--text-secondary);
                letter-spacing: 0.02em;
                margin-bottom: 10px;
            }

            .nav-lang-section-options {
                display: flex !important;
                flex-direction: row !important;
                flex-wrap: wrap;
                gap: 8px;
                align-items: center;
            }

            .nav-lang-item-mobile {
                padding: 7px 16px !important;
                background: #f0f0f5;
                border-radius: 20px;
                font-size: 14px !important;
                color: #1d1d1f;
                height: auto !important;
                min-height: 0 !important;
                width: auto !important;
                max-width: none;
                justify-content: center;
                opacity: 1;
                flex-shrink: 0;
            }

            .nav-lang-item-mobile:hover {
                background: #e2e2e8;
                opacity: 1;
            }

            .nav-lang-item-mobile.nav-lang-item--active {
                background: var(--accent-blue);
                color: #fff;
                font-weight: 600;
            }

            .nav-lang-item-mobile.nav-lang-item--active::after {
                display: none;
            }
        }

        .footer-directory {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            padding: 30px 0;
            border-bottom: 1px solid var(--border-color);
            margin-bottom: 20px;
        }

        .footer-column h4 {
            font-size: 12px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .footer-column ul {
            list-style: none;
        }

        .footer-column li {
            margin-bottom: 8px;
        }

        .footer-column a {
            font-size: 12px;
            color: var(--text-secondary);
        }

        .footer-column a:hover {
            color: var(--text-primary);
            text-decoration: underline;
        }

        /* Footer language switcher */
        .footer-lang {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 14px 0;
            border-top: 1px solid var(--border-color);
            flex-wrap: wrap;
        }

        .footer-lang-label {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 12px;
            color: var(--text-secondary);
            flex-shrink: 0;
        }

        .footer-lang-link {
            font-size: 12px;
            color: var(--text-secondary);
            white-space: nowrap;
        }

        .footer-lang-link:hover {
            color: var(--text-primary);
            opacity: 1;
        }

        .footer-lang-link--active {
            color: var(--text-primary);
            font-weight: 600;
        }

        /* Footer */
        .footer {
            background-color: #ffffff;
            padding: 50px 0;
            margin-top: 80px;
            border-top: 1px solid var(--border-color);
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .footer-text {
            font-size: 12px;
            color: var(--text-secondary);
            margin-bottom: 16px;
            padding-bottom: 16px;
            border-bottom: 1px solid var(--border-color);
            line-height: 1.6;
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 12px;
            color: var(--text-secondary);
            flex-wrap: wrap;
            gap: 16px;
        }

        .footer-links {
            display: flex;
            gap: 16px;
        }

        .footer-links a { color: var(--text-primary); }

        @media (max-width: 768px) {
            .footer {
                padding: 40px 0;
                margin-top: 56px;
            }

            .footer-directory {
                grid-template-columns: 1fr;
                gap: 26px;
                padding: 24px 0;
            }

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }

            .footer-links {
                flex-wrap: wrap;
                row-gap: 8px;
            }
        }