.dark input,
        .dark select {
            background: #13223a;
            color: #f1f5f9;
            border-color: #26395a;
        }
        .dark input:focus,
        .dark select:focus {
            border-color: #1f6fbf;
            box-shadow: 0 0 0 3px rgba(10, 79, 148, 0.2);
        }
        .dark .result-card-highlight {
            background: #11243f;
            border-color: #173a63;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            background-color: var(--bg);
            color: var(--text);
            line-height: 1.6;
            min-height: 100vh;
            transition: background-color var(--transition), color var(--transition);
            overflow-x: hidden;
        }
        body.drawer-open {
            overflow: hidden;
        }
        .svg-icon {
            display: block;
            flex-shrink: 0;
            stroke: currentColor;
            fill: none;
            stroke-width: 2;
            stroke-linecap: round;
            stroke-linejoin: round;
            width: 1em;
            height: 1em;
            vertical-align: middle;
        }
        .svg-icon-filled {
            fill: currentColor;
            stroke: none;
        }
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: var(--card-bg);
            border-bottom: 1px solid var(--border);
            height: var(--header-height);
            display: flex;
            align-items: center;
            transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .header-inner {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            flex-shrink: 0;
        }
        .site-logo {
            height: 48px;
            width: auto;
            display: block;
        }
        .dark .site-logo {
            content: url('https://numbrwiz.com/logo-dark.svg');
        }
        .header-nav-desktop {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-shrink: 0;
        }
        .header-nav-desktop a {
            text-decoration: none;
            color: var(--text-secondary);
            font-size: 0.85rem;
            font-weight: 500;
            padding: 7px 13px;
            border-radius: 999px;
            transition: all var(--transition);
            white-space: nowrap;
            letter-spacing: -0.01em;
        }
        .header-nav-desktop a:hover {
            color: var(--primary);
            background: var(--primary-50);
        }
        .header-nav-desktop a:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        .dark .header-nav-desktop a:hover {
            background: #173a63;
            color: #6cb2f0;
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-shrink: 0;
        }
        .icon-btn {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            border: 1.5px solid var(--border);
            background: var(--card-bg);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all var(--transition);
            color: var(--text);
            flex-shrink: 0;
            line-height: 1;
            padding: 0;
        }
        .icon-btn:hover {
            border-color: var(--primary);
            background: var(--primary-50);
        }
        .icon-btn:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        .dark .icon-btn:hover {
            background: #173a63;
            border-color: #1f6fbf;
        }
        .icon-btn .svg-icon {
            width: 1.15rem;
            height: 1.15rem;
        }
        .hamburger-btn {
            display: none;
        }
        .drawer-overlay {
            position: fixed;
            inset: 0;
            z-index: 150;
            background: rgba(0, 0, 0, 0.55);
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease;
        }
        .drawer-overlay.active {
            opacity: 1;
            pointer-events: auto;
        }
        .mobile-drawer {
            position: fixed;
            top: 0;
            right: 0;
            z-index: 160;
            width: 280px;
            max-width: 85vw;
            height: 100vh;
            background: var(--card-bg);
            border-left: 1px solid var(--border);
            box-shadow: var(--shadow-lg);
            transform: translateX(100%);
            transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            display: flex;
            flex-direction: column;
            padding: 20px;
        }
        .mobile-drawer.active {
            transform: translateX(0);
        }
        .drawer-close-btn {
            align-self: flex-end;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            border: 1.5px solid var(--border);
            background: var(--card-bg);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text);
            transition: all var(--transition);
            margin-bottom: 16px;
            line-height: 1;
            padding: 0;
        }
        .drawer-close-btn:hover {
            border-color: #ef4444;
            color: #b91c1c;
            background: #fef2f2;
        }
        .dark .drawer-close-btn:hover {
            background: #3b1a1a;
        }
        .drawer-close-btn .svg-icon {
            width: 0.85rem;
            height: 0.85rem;
        }
        .drawer-nav a {
            display: block;
            padding: 12px 16px;
            text-decoration: none;
            color: var(--text);
            font-weight: 500;
            font-size: 0.95rem;
            border-radius: var(--radius);
            transition: all var(--transition);
            margin-bottom: 4px;
            letter-spacing: -0.01em;
        }
        .drawer-nav a:hover {
            background: var(--primary-50);
            color: var(--primary);
        }
        .dark .drawer-nav a:hover {
            background: #173a63;
            color: #6cb2f0;
        }
        .drawer-nav a:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        .breadcrumb-nav {
            padding: 14px 0 6px;
            font-size: 0.78rem;
            color: var(--text-muted);
            display: flex;
            flex-wrap: wrap;
            gap: 4px;
            align-items: center;
        }
        .breadcrumb-nav a {
            color: var(--text-muted);
            text-decoration: none;
            transition: color var(--transition);
        }
        .breadcrumb-nav a:hover {
            color: var(--primary);
        }
        .breadcrumb-sep {
            color: var(--text-muted);
            opacity: 0.5;
            user-select: none;
        }
        .breadcrumb-current {
            color: var(--text-secondary);
            font-weight: 500;
        }
        .main-content {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .section {
            padding: 32px 0;
        }
        .hero {
            text-align: center;
            padding: 32px 0;
        }
        .hero h1 {
            font-size: clamp(1.55rem, 2.8vw, 2rem);
            font-weight: 800;
            letter-spacing: -0.03em;
            color: var(--secondary);
            line-height: 1.2;
            margin-bottom: 8px;
            max-width: 650px;
            margin-left: auto;
            margin-right: auto;
        }
        .dark .hero h1 {
            color: #f8fafc;
        }
        .hero .hero-sub {
            font-size: 0.95rem;
            color: var(--text-secondary);
            max-width: 540px;
            margin: 0 auto 16px;
            line-height: 1.5;
        }
        .trust-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
        }
        .trust-badge {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 0.78rem;
            color: var(--text-secondary);
            font-weight: 500;
            background: var(--card-bg);
            padding: 6px 12px;
            border-radius: 999px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }
        .trust-badge-icon {
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }
        .trust-badge-icon .svg-icon {
            width: 0.7rem;
            height: 0.7rem;
            color: var(--primary);
        }
        .page-layout {
            display: grid;
            grid-template-columns: 220px minmax(0, 1fr) 300px;
            gap: 32px;
            align-items: start;
        }
        .toc-sidebar {
            position: sticky;
            top: calc(var(--header-height) + 16px);
            z-index: 50;
            max-height: calc(100vh - var(--header-height) - 40px);
            overflow-y: auto;
        }
        .toc-inner {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 16px 14px;
            box-shadow: var(--shadow-sm);
        }
        .toc-inner h4 {
            font-size: 0.78rem;
            text-transform: uppercase;
            letter-spacing: 0.04em;
            color: var(--text-muted);
            margin-bottom: 10px;
            font-weight: 600;
        }
        .toc-inner a {
            display: block;
            padding: 6px 10px;
            font-size: 0.8rem;
            color: var(--text-secondary);
            text-decoration: none;
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            margin-bottom: 2px;
            letter-spacing: -0.01em;
            border-left: 2px solid transparent;
        }
        .toc-inner a:hover {
            color: var(--primary);
            background: var(--primary-50);
        }
        .toc-inner a.toc-active {
            color: var(--primary);
            background: var(--primary-50);
            border-left-color: var(--primary);
            font-weight: 600;
        }
        .dark .toc-inner a:hover,
        .dark .toc-inner a.toc-active {
            background: #173a63;
            color: #6cb2f0;
        }
        .dark .toc-inner a.toc-active {
            border-left-color: #6cb2f0;
        }
        .content-main {
            min-width: 0;
        }
        .ads-sidebar {
            position: relative;
        }
        .ad-sidebar-sticky {
            position: sticky;
            top: 90px;
            min-height: 600px;
            width: 300px;
        }
        .calc-card-main {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-xl);
            padding: 24px 22px;
            box-shadow: var(--shadow-md);
            transition: all var(--transition);
            scroll-margin-top: calc(var(--header-height) + 16px);
        }
        .calc-card-main h2 {
            font-size: 1.25rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            color: var(--secondary);
            margin-bottom: 6px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .dark .calc-card-main h2 {
            color: #f8fafc;
        }
        .calc-card-main .calc-subtitle {
            font-size: 0.82rem;
            color: var(--text-muted);
            margin-bottom: 18px;
        }
        .input-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
            margin-bottom: 16px;
        }
        .input-grid.three-col {
            grid-template-columns: 1fr 1fr 1fr;
        }
        .input-group {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .input-group label {
            font-weight: 600;
            font-size: 0.8rem;
            color: var(--text-secondary);
            letter-spacing: -0.01em;
        }
        .input-group input,
        .input-group select {
            padding: 10px 12px;
            border: 1.5px solid var(--border);
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-family: var(--font-sans);
            transition: all var(--transition);
            width: 100%;
            background: var(--bg);
            color: var(--text);
        }
        .input-group input:focus,
        .input-group select:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(10, 79, 148, 0.08);
        }
        .input-group input.input-error,
        .input-group select.input-error {
            border-color: #ef4444;
            box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.08);
        }
        .input-error-msg {
            font-size: 0.7rem;
            color: #b91c1c;
            min-height: 16px;
            font-weight: 500;
        }
        .btn-row {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            margin-bottom: 14px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 11px 22px;
            border-radius: 999px;
            font-weight: 600;
            font-size: 0.93rem;
            cursor: pointer;
            text-decoration: none;
            transition: all var(--transition);
            border: none;
            font-family: var(--font-sans);
            white-space: nowrap;
            letter-spacing: -0.01em;
        }
        .btn-primary {
            background: var(--nw-solid-primary);
            color: #fff;
            box-shadow: 0 3px 12px rgba(10, 79, 148, 0.3);
        }
        .btn-primary:hover {
            background: var(--primary-hover);
            box-shadow: 0 5px 18px rgba(10, 79, 148, 0.38);
            transform: translateY(-1px);
        }
        .btn-primary:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }
        .btn-outline {
            background: var(--card-bg);
            color: var(--text-secondary);
            border: 1.5px solid var(--border);
        }
        .btn-outline:hover {
            border-color: var(--primary);
            background: var(--primary-50);
            color: var(--primary);
        }
        .dark .btn-outline:hover {
            background: #173a63;
            color: #6cb2f0;
        }
        .btn-sm {
            padding: 8px 14px;
            font-size: 0.8rem;
            border-radius: 999px;
            font-weight: 600;
            cursor: pointer;
            border: 1.5px solid var(--border);
            font-family: var(--font-sans);
            transition: all var(--transition);
            letter-spacing: -0.01em;
            background: var(--card-bg);
            color: var(--text-secondary);
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }
        .btn-sm:hover {
            border-color: var(--primary);
            background: var(--primary-50);
            color: var(--primary);
        }
        .dark .btn-sm:hover {
            background: #173a63;
            color: #6cb2f0;
        }
        .btn-sm.btn-success-state {
            background: var(--success-bg);
            border-color: var(--success);
            color: var(--success);
        }
        .result-area {
            margin-top: 10px;
            min-height: 60px;
            transition: all 0.3s ease;
        }
        .result-card-highlight {
            background: var(--primary-50);
            border: 2px solid var(--primary-light);
            border-radius: var(--radius-lg);
            padding: 20px;
            animation: fadeSlideIn 0.35s ease-out;
        }
        .result-card-highlight .result-main {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: -0.02em;
            word-break: break-all;
            margin-bottom: 6px;
        }
        .result-card-highlight .result-details {
            font-size: 0.84rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        .result-card-highlight .result-details strong {
            color: var(--text);
        }
        .dark .result-card-highlight .result-details strong {
            color: #f1f5f9;
        }
        .result-card-highlight .result-label-sm {
            font-size: 0.73rem;
            color: var(--text-muted);
            font-weight: 500;
            margin-top: 2px;
        }
        .result-actions {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            justify-content: center;
            margin-top: 12px;
        }
        .skeleton-loader {
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 18px 16px;
            min-height: 52px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            transition: all 0.25s ease;
        }
        .skeleton-spinner {
            width: 20px;
            height: 20px;
            border: 2.5px solid var(--border);
            border-top-color: var(--primary);
            border-radius: 50%;
            animation: spin 0.7s linear infinite;
        }
        @keyframes spin {
            to {
                transform: rotate(360deg);
            }
        }
        .skeleton-pulse {
            width: 50%;
            height: 10px;
            background: var(--border);
            border-radius: 5px;
            animation: pulse 1.5s ease-in-out infinite;
        }
        @keyframes pulse {
            0%,
            100% {
                opacity: 0.35;
            }
            50% {
                opacity: 0.75;
            }
        }
        @keyframes fadeSlideIn {
            from {
                opacity: 0;
                transform: translateY(6px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .result-placeholder {
            background: var(--bg);
            border: 1px dashed var(--border);
            border-radius: var(--radius);
            padding: 18px 16px;
            text-align: center;
            color: var(--text-muted);
            font-size: 0.85rem;
            min-height: 52px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .steps-block {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 20px;
            margin-top: 14px;
            box-shadow: var(--shadow-sm);
        }
        .steps-block h3 {
            font-size: 0.95rem;
            font-weight: 700;
            letter-spacing: -0.01em;
            margin-bottom: 10px;
            color: var(--secondary);
        }
        .dark .steps-block h3 {
            color: #f1f5f9;
        }
        .step-item {
            display: flex;
            gap: 10px;
            margin-bottom: 8px;
            font-size: 0.84rem;
            color: var(--text-secondary);
            align-items: flex-start;
        }
        .step-num {
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--nw-solid-primary);
            color: #fff;
            font-weight: 700;
            font-size: 0.72rem;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }
        .step-formula {
            background: var(--bg);
            padding: 6px 10px;
            border-radius: var(--radius-sm);
            font-family: var(--font-sans);
            font-weight: 600;
            letter-spacing: 0.01em;
            color: var(--primary);
            font-size: 0.85rem;
            display: inline-block;
            margin: 2px 0;
        }
        .ad-container {
            width: 100%;
            background: var(--ad-subtle-bg);
            border: 1px dashed var(--ad-subtle-border);
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 60px;
            padding: 14px 16px;
            margin: 12px 0;
            transition: all var(--transition);
            color: var(--text-muted);
            font-size: 0.68rem;
            letter-spacing: 0.05em;
            text-transform: uppercase;
            text-align: center;
            opacity: 0.7;
        }
        .ad-container.ad-leaderboard {
            min-height: 70px;
            max-height: 100px;
        }
        .ad-container.ad-rectangle {
            min-height: 200px;
            max-width: 300px;
            margin-left: auto;
            margin-right: auto;
        }
        .ad-container.ad-inline {
            min-height: 70px;
            max-height: 110px;
            margin: 18px 0;
        }
        .ad-container:empty {
            display: none !important;
        }
        .info-block {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 22px 20px;
            box-shadow: var(--shadow-sm);
            scroll-margin-top: calc(var(--header-height) + 16px);
        }
        .info-block h2 {
            font-size: 1.3rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            color: var(--secondary);
            margin-bottom: 24px;
        }
        .dark .info-block h2 {
            color: #f8fafc;
        }
        .info-block h3 {
            font-size: 1.05rem;
            font-weight: 600;
            letter-spacing: -0.01em;
            color: var(--secondary);
            margin: 14px 0 6px;
        }
        .dark .info-block h3 {
            color: #f1f5f9;
        }
        .info-block p,
        .info-block li {
            color: var(--text-secondary);
            font-size: 0.88rem;
            line-height: 1.65;
        }
        .info-block ul {
            list-style: disc;
            padding-left: 18px;
            margin: 6px 0 12px;
        }
        .info-block ul li {
            margin-bottom: 3px;
        }
        .formula-display {
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 14px 16px;
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--primary);
            text-align: center;
            letter-spacing: 0.02em;
            margin: 8px 0;
            font-family: var(--font-sans);
        }
        .paa-list {
            display: flex;
            flex-direction: column;
            gap: 8px;
            max-width: 720px;
            margin-top: 24px;
        }
        .paa-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .paa-question {
            width: 100%;
            background: none;
            border: none;
            padding: 14px 16px;
            font-size: 0.9rem;
            font-weight: 600;
            cursor: pointer;
            text-align: left;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--secondary);
            font-family: var(--font-sans);
            letter-spacing: -0.01em;
            gap: 10px;
            transition: color var(--transition);
        }
        .dark .paa-question {
            color: #f1f5f9;
        }
        .paa-question:hover {
            color: var(--primary);
        }
        .paa-arrow {
            flex-shrink: 0;
            transition: transform var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
        }
        .paa-arrow .svg-icon {
            width: 0.7rem;
            height: 0.7rem;
        }
        .paa-item.open .paa-arrow {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .paa-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 16px;
            font-size: 0.83rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        .paa-item.open .paa-answer {
            max-height: 350px;
            padding: 0 16px 14px;
        }
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 8px;
            max-width: 720px;
            margin-top: 24px;
        }
        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            width: 100%;
            background: none;
            border: none;
            padding: 15px 18px;
            font-size: 0.92rem;
            font-weight: 600;
            cursor: pointer;
            text-align: left;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--secondary);
            font-family: var(--font-sans);
            letter-spacing: -0.01em;
            gap: 10px;
            transition: color var(--transition);
        }
        .dark .faq-question {
            color: #f1f5f9;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-arrow {
            flex-shrink: 0;
            transition: transform var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
        }
        .faq-arrow .svg-icon {
            width: 0.75rem;
            height: 0.75rem;
        }
        .faq-item.open .faq-arrow {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 18px;
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        .faq-item.open .faq-answer {
            max-height: 400px;
            padding: 0 18px 16px;
        }
        .glossary-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
            gap: 24px;
            margin-top: 24px;
        }
        .glossary-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 20px;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }
        .glossary-card h4 {
            font-weight: 700;
            font-size: 0.88rem;
            letter-spacing: -0.01em;
            color: var(--primary);
            margin-bottom: 4px;
        }
        .glossary-card p {
            font-size: 0.78rem;
            color: var(--text-secondary);
            line-height: 1.5;
            margin: 0;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 24px;
            margin-top: 24px;
        }
        .related-card {
            background: var(--card-bg);
            border: 1px solid var(--border-light);
            border-radius: var(--radius);
            padding: 20px;
            text-decoration: none;
            color: inherit;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .related-card:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-md);
            transform: translateY(-1px);
        }
        .related-card-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }
        .related-card-icon .svg-icon {
            width: 1.1rem;
            height: 1.1rem;
            color: var(--primary);
        }
        .related-card span {
            font-weight: 500;
            font-size: 0.82rem;
            letter-spacing: -0.01em;
        }
        .eeat-section {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-xl);
            padding: 22px 20px;
            box-shadow: var(--shadow-sm);
        }
        .eeat-section h3 {
            font-size: 1.1rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            margin-bottom: 8px;
            color: var(--secondary);
        }
        .dark .eeat-section h3 {
            color: #f1f5f9;
        }
        .eeat-section p,
        .eeat-section li {
            color: var(--text-secondary);
            font-size: 0.85rem;
            line-height: 1.6;
        }
        .eeat-section ul {
            list-style: disc;
            padding-left: 18px;
            margin: 6px 0;
        }
        .last-updated {
            text-align: center;
            font-size: 0.73rem;
            color: var(--text-muted);
            padding: 6px 0;
            letter-spacing: 0.02em;
        }
        .toast-container {
            position: fixed;
            bottom: 24px;
            right: 20px;
            z-index: 300;
            display: flex;
            flex-direction: column;
            gap: 8px;
            pointer-events: none;
        }
        .toast {
            pointer-events: auto;
            background: var(--secondary);
            color: #fff;
            padding: 12px 18px;
            border-radius: 999px;
            font-size: 0.82rem;
            font-weight: 500;
            box-shadow: var(--shadow-lg);
            animation: toastIn 0.3s ease-out, toastOut 0.25s ease-in forwards;
            animation-delay: 0s, 2.2s;
            opacity: 0;
            letter-spacing: -0.01em;
            white-space: nowrap;
        }
        @keyframes toastIn {
            from {
                opacity: 0;
                transform: translateY(12px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        @keyframes toastOut {
            from {
                opacity: 1;
            }
            to {
                opacity: 0;
                transform: translateY(-6px);
            }
        }
        .dark .toast {
            background: #f1f5f9;
            color: #0b1526;
        }
        [data-tooltip] {
            position: relative;
        }
        [data-tooltip]::after {
            content: attr(data-tooltip);
            position: absolute;
            bottom: calc(100% + 6px);
            left: 50%;
            transform: translateX(-50%);
            background: var(--secondary);
            color: #fff;
            padding: 5px 10px;
            border-radius: 6px;
            font-size: 0.7rem;
            white-space: nowrap;
            pointer-events: none;
            opacity: 0;
            transition: opacity 0.2s ease;
            letter-spacing: 0.01em;
        }
        [data-tooltip]:hover::after {
            opacity: 1;
        }
        .dark [data-tooltip]::after {
            background: #f1f5f9;
            color: #0b1526;
        }
        @media (max-width: 1200px) {
            .ads-sidebar {
                display: none;
            }
            .page-layout {
                grid-template-columns: 1fr;
            }
        }
        @media (min-width: 1025px) and (max-width: 1200px) {
            .page-layout {
                grid-template-columns: 220px minmax(0, 1fr);
            }
            .toc-sidebar {
                display: block;
            }
        }
        @media (max-width: 1024px) {
            .toc-sidebar {
                display: none;
            }
            .page-layout {
                grid-template-columns: 1fr;
            }
            .header-nav-desktop a {
                font-size: 0.78rem;
                padding: 6px 10px;
            }
        }
        @media (max-width: 768px) {
            .header-nav-desktop {
                display: none;
            }
            .hamburger-btn {
                display: flex;
            }
            .section {
                padding: 32px 0;
            }
            .hero {
                padding: 32px 0;
            }
            .hero h1 {
                font-size: 1.35rem;
            }
            .input-grid {
                grid-template-columns: 1fr 1fr;
            }
            .input-grid.three-col {
                grid-template-columns: 1fr 1fr;
            }
            .glossary-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .related-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .btn-row {
                flex-direction: column;
            }
            .btn-row .btn,
            .btn-row .btn-sm {
                width: 100%;
                justify-content: center;
            }
            .result-actions {
                gap: 6px;
            }
            .result-actions .btn-sm {
                font-size: 0.73rem;
                padding: 7px 11px;
            }
        }
        @media (max-width: 480px) {
            .input-grid {
                grid-template-columns: 1fr;
            }
            .input-grid.three-col {
                grid-template-columns: 1fr;
            }
            .trust-badges {
                gap: 5px;
            }
            .trust-badge {
                font-size: 0.68rem;
                padding: 4px 8px;
            }
            .related-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .calc-card-main {
                padding: 16px 14px;
            }
            .result-card-highlight .result-main {
                font-size: 1.1rem;
            }
            .mobile-drawer {
                width: 100%;
                max-width: 100%;
            }
        }
        @media print {
            .site-header,
            .drawer-overlay,
            .mobile-drawer,
            .ad-container,
            .toc-sidebar,
            .ads-sidebar,
            .toast-container,
            .btn-row,
            .result-actions,
            .last-updated,
            .breadcrumb-nav {
                display: none !important;
            }
            body {
                background: #fff;
                color: #000;
                font-size: 13px;
            }
            .main-content {
                max-width: 100%;
                padding: 0;
            }
            .page-layout {
                display: block;
            }
            .calc-card-main,
            .info-block,
            .steps-block,
            .eeat-section,
            .result-card-highlight {
                box-shadow: none;
                border: 1px solid #ccc;
                break-inside: avoid;
                background: #fff;
            }
            .result-card-highlight {
                background: #eef5fc;
            }
            a {
                color: #000;
                text-decoration: underline;
            }
        }
        @media (prefers-reduced-motion: reduce) {
            html {
                scroll-behavior: auto;
            }
            *,
            *::before,
            *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
            }
        }