/* ---------- CSS Variables ---------- */
        :root {
            --bg-body: #f6f9fc;
            --bg-card: #ffffff;
            --bg-nav: #0b1a2e;
            --bg-footer: #0b1a2e;
            --text-primary: #0b1a2e;
            --text-secondary: #2d4059;
            --text-muted: #6b7a8f;
            --text-light: #f0f4f8;
            --text-nav: #e8edf3;
            --border-color: #dce4ec;
            --shadow: 0 8px 32px rgba(11, 26, 46, 0.10);
            --shadow-hover: 0 12px 48px rgba(11, 26, 46, 0.18);
            --radius: 16px;
            --radius-sm: 10px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --accent: #2563eb;
            --accent-hover: #1d4ed8;
            --accent-glow: rgba(37, 99, 235, 0.25);
            --success: #059669;
            --warning: #d97706;
            --danger: #dc2626;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --font-display: 'Outfit', 'Inter', sans-serif;
            --max-width: 1200px;
            --nav-height: 72px;
            --cookie-bg: #1e293b;
            --cookie-text: #f1f5f9;
            --code-bg: #f1f5f9;
            --code-text: #0b1a2e;
        }

        /* Dark theme */
        [data-theme="dark"] {
            --bg-body: #0f1724;
            --bg-card: #1a2639;
            --bg-nav: #080f1a;
            --bg-footer: #080f1a;
            --text-primary: #f1f5f9;
            --text-secondary: #cbd5e1;
            --text-muted: #94a3b8;
            --text-light: #f1f5f9;
            --text-nav: #f1f5f9;
            --border-color: #2d3a4f;
            --shadow: 0 8px 32px rgba(0, 0, 0, 0.40);
            --shadow-hover: 0 12px 48px rgba(0, 0, 0, 0.55);
            --accent: #3b82f6;
            --accent-hover: #60a5fa;
            --accent-glow: rgba(59, 130, 246, 0.20);
            --code-bg: #1e293b;
            --code-text: #e2e8f0;
            --cookie-bg: #1e293b;
            --cookie-text: #f1f5f9;
        }

        /* ---------- Reset & Base ---------- */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.6;
            transition: background var(--transition), color var(--transition);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            overflow-x: hidden;
        }

        a {
            color: var(--accent);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent-hover);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
            width: 100%;
        }

        /* ---------- Skip Link ---------- */
        .skip-link {
            position: absolute;
            top: -100%;
            left: 50%;
            transform: translateX(-50%);
            background: var(--accent);
            color: #fff;
            padding: 10px 24px;
            border-radius: 0 0 8px 8px;
            z-index: 9999;
            font-weight: 600;
            transition: top 0.3s;
        }
        .skip-link:focus {
            top: 0;
        }

        /* ---------- Navbar ---------- */
        .navbar {
            background: var(--bg-nav);
            color: var(--text-nav);
            position: sticky;
            top: 0;
            z-index: 1000;
            height: var(--nav-height);
            display: flex;
            align-items: center;
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.15);
            transition: background var(--transition), box-shadow var(--transition);
        }

        .navbar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            gap: 12px;
        }

        .nav-brand {
            font-family: var(--font-display);
            font-weight: 800;
            font-size: 1.3rem;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 8px;
            flex-shrink: 0;
        }
        .nav-brand span {
            color: var(--accent);
        }
        .nav-brand svg {
            width: 28px;
            height: 28px;
            fill: var(--accent);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            list-style: none;
            flex-wrap: wrap;
        }

        .nav-links>li {
            position: relative;
        }

        .nav-links a {
            color: var(--text-nav);
            padding: 8px 14px;
            border-radius: 8px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: background var(--transition), color var(--transition);
            display: flex;
            align-items: center;
            gap: 4px;
            white-space: nowrap;
        }
        .nav-links a:hover,
        .nav-links a:focus-visible {
            background: rgba(255, 255, 255, 0.08);
            color: #fff;
        }
        .nav-links a .arrow {
            font-size: 0.6rem;
            margin-left: 2px;
            transition: transform var(--transition);
        }
        .nav-links a[aria-expanded="true"] .arrow {
            transform: rotate(180deg);
        }

        /* Dropdown */
        .dropdown-menu {
            position: absolute;
            top: 100%;
            left: 0;
            background: var(--bg-card);
            color: var(--text-primary);
            min-width: 260px;
            border-radius: var(--radius-sm);
            box-shadow: var(--shadow-hover);
            padding: 10px 0;
            opacity: 0;
            visibility: hidden;
            transform: translateY(8px);
            transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
            z-index: 999;
            border: 1px solid var(--border-color);
            max-height: 70vh;
            overflow-y: auto;
        }
        .dropdown-menu.open {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        .dropdown-menu a {
            color: var(--text-primary);
            padding: 8px 20px;
            display: block;
            font-size: 0.875rem;
            font-weight: 400;
            white-space: normal;
            border-radius: 0;
        }
        .dropdown-menu a:hover {
            background: var(--accent);
            color: #fff;
        }
        .dropdown-menu .dropdown-title {
            font-weight: 700;
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            color: var(--text-muted);
            padding: 4px 20px 8px;
            border-bottom: 1px solid var(--border-color);
            margin-bottom: 6px;
        }

        /* Mobile toggle */
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 6px 4px;
            border-radius: 6px;
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.06);
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-nav);
            border-radius: 4px;
            transition: var(--transition);
            transform-origin: center;
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* Theme toggle in nav */
        .theme-toggle {
            background: rgba(255, 255, 255, 0.08);
            border: none;
            border-radius: 50%;
            width: 38px;
            height: 38px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            color: var(--text-nav);
            font-size: 1.1rem;
            transition: background var(--transition), transform var(--transition);
            flex-shrink: 0;
        }
        .theme-toggle:hover {
            background: rgba(255, 255, 255, 0.16);
            transform: scale(1.05);
        }
        .theme-toggle:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        /* ---------- Breadcrumb ---------- */
        .breadcrumb {
            padding: 16px 0 8px;
            font-size: 0.8rem;
            color: var(--text-muted);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 4px 8px;
        }
        .breadcrumb a {
            color: var(--text-muted);
            transition: color var(--transition);
        }
        .breadcrumb a:hover {
            color: var(--accent);
        }
        .breadcrumb .sep {
            color: var(--text-muted);
            opacity: 0.5;
        }
        .breadcrumb .current {
            color: var(--text-primary);
            font-weight: 500;
        }

        /* ---------- Hero ---------- */
        .hero {
            padding: 40px 0 32px;
            text-align: center;
        }
        .hero h1 {
            font-family: var(--font-display);
            font-weight: 800;
            font-size: clamp(2rem, 5vw, 3.2rem);
            line-height: 1.15;
            margin-bottom: 12px;
            letter-spacing: -0.02em;
        }
        .hero h1 .highlight {
            color: var(--accent);
        }
        .hero p {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 720px;
            margin: 0 auto 20px;
            line-height: 1.7;
        }
        .hero .badge {
            display: inline-block;
            background: var(--accent-glow);
            color: var(--accent);
            padding: 4px 18px;
            border-radius: 40px;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.03em;
            text-transform: uppercase;
            margin-bottom: 16px;
        }

        /* ---------- Calculator Card ---------- */
        .calc-section {
            padding: 16px 0 40px;
        }
        .calc-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 32px 28px;
            transition: background var(--transition), box-shadow var(--transition);
            border: 1px solid var(--border-color);
            max-width: 900px;
            margin: 0 auto;
        }
        .calc-card .row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px 28px;
            margin-bottom: 20px;
        }
        .calc-card .row.full {
            grid-template-columns: 1fr;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 5px;
        }
        .form-group label {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .form-group label .req {
            color: var(--danger);
            font-weight: 700;
        }
        .form-group .hint {
            font-size: 0.75rem;
            color: var(--text-muted);
            font-weight: 400;
        }
        .form-group input,
        .form-group select {
            padding: 10px 14px;
            border: 2px solid var(--border-color);
            border-radius: var(--radius-sm);
            font-size: 1rem;
            font-family: var(--font-sans);
            background: var(--bg-body);
            color: var(--text-primary);
            transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
            width: 100%;
            appearance: auto;
        }
        .form-group input:focus,
        .form-group select:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 0 0 4px var(--accent-glow);
        }
        .form-group input.error,
        .form-group select.error {
            border-color: var(--danger);
            box-shadow: 0 0 0 4px rgba(220, 38, 38, 0.15);
        }
        .form-group .error-msg {
            font-size: 0.78rem;
            color: var(--danger);
            min-height: 1.2em;
            font-weight: 500;
        }
        .form-group .error-msg:empty {
            min-height: 0;
        }

        .form-group select {
            cursor: pointer;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%236b7a8f' stroke-width='2' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right 14px center;
            padding-right: 40px;
            background-size: 12px;
        }
        [data-theme="dark"] .form-group select {
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2394a3b8' stroke-width='2' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 32px;
            border: none;
            border-radius: var(--radius-sm);
            font-family: var(--font-sans);
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition), opacity var(--transition);
            background: var(--accent);
            color: #fff;
            min-height: 52px;
        }
        .btn:hover:not(:disabled) {
            background: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px var(--accent-glow);
        }
        .btn:active:not(:disabled) {
            transform: translateY(0);
        }
        .btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none !important;
            box-shadow: none !important;
        }
        .btn-secondary {
            background: var(--border-color);
            color: var(--text-primary);
        }
        .btn-secondary:hover:not(:disabled) {
            background: var(--text-muted);
            color: #fff;
        }
        .btn-success {
            background: var(--success);
        }
        .btn-success:hover:not(:disabled) {
            background: #047857;
        }
        .btn-outline {
            background: transparent;
            border: 2px solid var(--border-color);
            color: var(--text-primary);
        }
        .btn-outline:hover:not(:disabled) {
            background: var(--border-color);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 0.85rem;
            min-height: 40px;
        }

        .btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 8px;
        }

        /* ---------- Results ---------- */
        #resultSection {
            margin-top: 28px;
            padding-top: 24px;
            border-top: 2px solid var(--border-color);
            display: none;
            animation: fadeUp 0.5s ease;
        }
        #resultSection.visible {
            display: block;
        }

        @keyframes fadeUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .result-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 16px;
            margin: 16px 0 20px;
        }
        .result-item {
            background: var(--bg-body);
            padding: 16px 18px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            transition: background var(--transition), border-color var(--transition);
        }
        .result-item .label {
            font-size: 0.75rem;
            text-transform: uppercase;
            letter-spacing: 0.04em;
            color: var(--text-muted);
            font-weight: 600;
        }
        .result-item .value {
            font-size: 1.35rem;
            font-weight: 700;
            margin-top: 2px;
            font-family: var(--font-display);
            color: var(--text-primary);
        }
        .result-item .value .unit {
            font-size: 0.8rem;
            font-weight: 400;
            color: var(--text-muted);
            margin-left: 4px;
        }
        .result-item.highlight-item {
            border-color: var(--accent);
            background: var(--accent-glow);
        }
        .result-item.highlight-item .value {
            color: var(--accent);
        }

        .result-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 16px;
            padding-top: 16px;
            border-top: 1px solid var(--border-color);
        }

        /* ---------- Features ---------- */
        .features {
            padding: 60px 0 40px;
        }
        .features h2 {
            font-family: var(--font-display);
            font-weight: 700;
            font-size: clamp(1.6rem, 3.5vw, 2.4rem);
            text-align: center;
            margin-bottom: 12px;
        }
        .features .sub {
            text-align: center;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto 36px;
            font-size: 1.05rem;
        }
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 24px;
        }
        .feature-card {
            background: var(--bg-card);
            padding: 24px 22px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow);
            transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
            text-align: center;
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }
        .feature-card .icon {
            font-size: 2.2rem;
            margin-bottom: 10px;
            display: block;
        }
        .feature-card h3 {
            font-family: var(--font-display);
            font-weight: 600;
            font-size: 1.1rem;
            margin-bottom: 6px;
        }
        .feature-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        /* ---------- How It Works ---------- */
        .how-it-works {
            padding: 40px 0 48px;
        }
        .how-it-works h2 {
            font-family: var(--font-display);
            font-weight: 700;
            font-size: clamp(1.6rem, 3.5vw, 2.4rem);
            text-align: center;
            margin-bottom: 32px;
        }
        .steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 24px;
            counter-reset: step;
        }
        .step {
            background: var(--bg-card);
            padding: 24px 20px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            text-align: center;
            position: relative;
            transition: background var(--transition), border-color var(--transition);
        }
        .step .num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--accent);
            color: #fff;
            font-weight: 700;
            font-size: 1.1rem;
            margin-bottom: 12px;
        }
        .step h3 {
            font-family: var(--font-display);
            font-weight: 600;
            font-size: 1.05rem;
            margin-bottom: 4px;
        }
        .step p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        /* ---------- FAQ ---------- */
        .faq-section {
            padding: 40px 0 48px;
        }
        .faq-section h2 {
            font-family: var(--font-display);
            font-weight: 700;
            font-size: clamp(1.6rem, 3.5vw, 2.4rem);
            text-align: center;
            margin-bottom: 32px;
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: background var(--transition), border-color var(--transition);
        }
        .faq-item summary {
            padding: 16px 22px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            list-style: none;
            transition: background var(--transition);
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary .marker {
            font-size: 1.2rem;
            transition: transform var(--transition);
            flex-shrink: 0;
            color: var(--accent);
        }
        .faq-item[open] summary .marker {
            transform: rotate(180deg);
        }
        .faq-item summary:hover {
            background: var(--bg-body);
        }
        .faq-item .answer {
            padding: 0 22px 20px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .faq-item .answer p:not(:last-child) {
            margin-bottom: 8px;
        }

        /* ---------- CTA ---------- */
        .cta-section {
            padding: 50px 0 48px;
            text-align: center;
            background: var(--bg-nav);
            color: var(--text-light);
            border-radius: var(--radius) var(--radius) 0 0;
            margin-top: 8px;
            transition: background var(--transition);
        }
        .cta-section h2 {
            font-family: var(--font-display);
            font-weight: 700;
            font-size: clamp(1.6rem, 3.5vw, 2.4rem);
            margin-bottom: 8px;
        }
        .cta-section p {
            font-size: 1.05rem;
            opacity: 0.85;
            max-width: 540px;
            margin: 0 auto 24px;
        }
        .cta-section .btn-group {
            justify-content: center;
        }
        .cta-section .btn {
            background: var(--accent);
            color: #fff;
        }
        .cta-section .btn:hover {
            background: var(--accent-hover);
        }
        .cta-section .btn-outline-light {
            background: transparent;
            border: 2px solid rgba(255, 255, 255, 0.35);
            color: var(--text-light);
        }
        .cta-section .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.10);
            border-color: rgba(255, 255, 255, 0.6);
        }

        /* ---------- SEO Content ---------- */
        .seo-content {
            padding: 40px 0 20px;
        }
        .seo-content h2 {
            font-family: var(--font-display);
            font-weight: 700;
            font-size: clamp(1.4rem, 2.8vw, 2rem);
            margin-bottom: 12px;
        }
        .seo-content p {
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 16px;
            max-width: 780px;
        }
        .seo-content h3 {
            font-family: var(--font-display);
            font-weight: 600;
            font-size: 1.2rem;
            margin: 24px 0 8px;
        }
        .seo-content ul {
            color: var(--text-secondary);
            padding-left: 24px;
            margin-bottom: 16px;
            line-height: 1.8;
        }
        .seo-content ul li {
            margin-bottom: 4px;
        }

        /* ---------- Footer ---------- */
        .footer {
            background: var(--bg-footer);
            color: var(--text-light);
            padding: 40px 0 20px;
            margin-top: auto;
            transition: background var(--transition);
        }
        .footer .cols {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 28px;
            margin-bottom: 28px;
        }
        .footer .col h4 {
            font-family: var(--font-display);
            font-weight: 600;
            font-size: 0.95rem;
            margin-bottom: 10px;
            color: #fff;
        }
        .footer .col a {
            display: block;
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.85rem;
            padding: 3px 0;
            transition: color var(--transition);
        }
        .footer .col a:hover {
            color: #fff;
        }
        .footer .bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.5);
        }
        .footer .bottom .legal a {
            color: rgba(255, 255, 255, 0.5);
            margin: 0 8px;
        }
        .footer .bottom .legal a:hover {
            color: #fff;
        }

        /* ---------- Cookie Banner ---------- */
        .cookie-banner {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            background: var(--cookie-bg);
            color: var(--cookie-text);
            padding: 16px 20px;
            z-index: 9999;
            box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.25);
            transform: translateY(100%);
            transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .cookie-banner.show {
            transform: translateY(0);
        }
        .cookie-banner .inner {
            max-width: var(--max-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 12px 20px;
        }
        .cookie-banner p {
            font-size: 0.9rem;
            flex: 1 1 300px;
            margin: 0;
            line-height: 1.5;
        }
        .cookie-banner p a {
            color: var(--accent);
            text-decoration: underline;
        }
        .cookie-banner .actions {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }
        .cookie-banner .btn-cookie {
            padding: 8px 22px;
            border: none;
            border-radius: 6px;
            font-weight: 600;
            font-size: 0.85rem;
            cursor: pointer;
            transition: background var(--transition), transform var(--transition);
        }
        .btn-cookie.accept {
            background: var(--accent);
            color: #fff;
        }
        .btn-cookie.accept:hover {
            background: var(--accent-hover);
            transform: scale(1.02);
        }
        .btn-cookie.dismiss {
            background: rgba(255, 255, 255, 0.10);
            color: var(--cookie-text);
        }
        .btn-cookie.dismiss:hover {
            background: rgba(255, 255, 255, 0.18);
        }

        /* ---------- Share / Feedback floating ---------- */
        .action-float {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 12px;
        }

        /* ---------- Responsive ---------- */
        @media (max-width: 820px) {
            .nav-links {
                position: absolute;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: var(--bg-nav);
                flex-direction: column;
                align-items: stretch;
                padding: 12px 20px 20px;
                gap: 2px;
                box-shadow: 0 16px 32px rgba(0, 0, 0, 0.25);
                transform: scaleY(0);
                transform-origin: top;
                opacity: 0;
                visibility: hidden;
                transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s;
                border-top: 1px solid rgba(255, 255, 255, 0.06);
                max-height: 80vh;
                overflow-y: auto;
            }
            .nav-links.open {
                transform: scaleY(1);
                opacity: 1;
                visibility: visible;
            }
            .nav-links>li {
                width: 100%;
            }
            .nav-links a {
                padding: 10px 14px;
                width: 100%;
                justify-content: space-between;
            }
            .dropdown-menu {
                position: static;
                box-shadow: none;
                border: none;
                border-radius: 0;
                background: rgba(255, 255, 255, 0.04);
                padding: 4px 0 8px;
                transform: none;
                max-height: none;
                overflow-y: visible;
                margin-left: 12px;
            }
            .dropdown-menu.open {
                transform: none;
                opacity: 1;
                visibility: visible;
            }
            .dropdown-menu a {
                padding: 6px 16px;
                font-size: 0.85rem;
            }
            .nav-toggle {
                display: flex;
            }
            .calc-card .row {
                grid-template-columns: 1fr;
            }
            .result-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer .cols {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 520px) {
            .result-grid {
                grid-template-columns: 1fr;
            }
            .footer .cols {
                grid-template-columns: 1fr;
            }
            .hero h1 {
                font-size: 1.8rem;
            }
            .calc-card {
                padding: 20px 16px;
            }
            .btn-group {
                flex-direction: column;
                align-items: stretch;
            }
            .btn-group .btn {
                width: 100%;
                justify-content: center;
            }
            .cookie-banner .inner {
                flex-direction: column;
                text-align: center;
            }
            .cookie-banner .actions {
                width: 100%;
                justify-content: center;
            }
            .breadcrumb {
                font-size: 0.7rem;
            }
            .feature-grid {
                grid-template-columns: 1fr 1fr;
            }
            .steps {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 400px) {
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .nav-brand {
                font-size: 1.05rem;
            }
            .nav-brand svg {
                width: 22px;
                height: 22px;
            }
        }

        /* ---------- Utility ---------- */
        .text-center {
            text-align: center;
        }
        .mt-8 {
            margin-top: 8px;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .gap-8 {
            gap: 8px;
        }
        .flex-wrap {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px 16px;
        }

        /* Scroll margin for fixed nav */
        .anchor-offset {
            scroll-margin-top: calc(var(--nav-height) + 16px);
        }

        /* ---------- Error logging (console only for demo) ---------- */
        .log-toast {
            position: fixed;
            bottom: 100px;
            right: 20px;
            background: var(--danger);
            color: #fff;
            padding: 10px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.85rem;
            font-weight: 500;
            box-shadow: var(--shadow-hover);
            opacity: 0;
            transform: translateY(20px);
            transition: opacity 0.4s, transform 0.4s;
            pointer-events: none;
            z-index: 999;
            max-width: 320px;
        }
        .log-toast.show {
            opacity: 1;
            transform: translateY(0);
        }