/* Gatling Suzhou SEO Landing Page Stylesheet */

/* --- 1. Variables & Design Tokens --- */
:root {
    /* Color Palette */
    --color-dark-900: #0f172a; /* Main dark background / slate-900 */
    --color-dark-800: #1e293b; /* Card dark bg / slate-800 */
    --color-dark-700: #334155; /* Slate-700 */
    --color-slate-500: #64748b; /* Slate-500 */
    --color-slate-300: #cbd5e1; /* Slate-300 */
    --color-slate-100: #f1f5f9; /* Slate-100 */
    --color-slate-50: #f8fafc;  /* Slate-50 */
    --color-white: #ffffff;
    
    /* Brand Accent (Teal) */
    --color-teal-500: #0d9488; /* Teal-600 */
    --color-teal-600: #0f766e; /* Teal-700 */
    --color-teal-400: #14b8a6; /* Teal-500 */
    --color-teal-50: #f0fdfa;  /* Teal-50 */
    
    /* Layout & Borders */
    --border-light: 1px solid #e2e8f0;
    --border-dark: 1px solid #334155;
    --border-teal-glow: 1px solid rgba(13, 148, 136, 0.3);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
    --shadow-teal-glow: 0 0 20px rgba(13, 148, 136, 0.15);
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    
    /* Transition */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- 2. Base Reset --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-dark-900);
    background-color: var(--color-white);
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-dark-900);
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-fast);
}

img, svg {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
}

ul {
    list-style: none;
}

/* --- 3. Reusable Components & Buttons --- */
.section-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 24px;
}

.section-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 56px auto;
}

.section-tag {
    display: inline-block;
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-teal-500);
    margin-bottom: 12px;
    border: 1px solid rgba(13, 148, 136, 0.2);
    padding: 4px 12px;
    border-radius: 50px;
    background-color: var(--color-teal-5);
}

.section-title {
    font-size: 2.25rem;
    margin-bottom: 16px;
    color: var(--color-dark-900);
    letter-spacing: -0.02em;
}

.section-desc {
    color: var(--color-slate-500);
    font-size: 1.1rem;
}

.badge {
    display: inline-block;
    padding: 6px 12px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    border-radius: var(--radius-sm);
    background: rgba(13, 148, 136, 0.15);
    color: var(--color-teal-400);
    border: 1px solid rgba(13, 148, 136, 0.2);
    margin-bottom: 20px;
    text-transform: uppercase;
}

.badge-teal {
    background: var(--color-teal-50);
    color: var(--color-teal-500);
    border: 1px solid rgba(13, 148, 136, 0.2);
}

/* Button System */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 600;
    padding: 12px 28px;
    border-radius: var(--radius-md);
    transition: var(--transition-normal);
    cursor: pointer;
    border: 1px solid transparent;
}

.btn-primary {
    background-color: var(--color-teal-500);
    color: var(--color-white);
}

.btn-primary:hover {
    background-color: var(--color-teal-600);
    box-shadow: var(--shadow-teal-glow);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--color-white);
    border: 1px solid var(--color-dark-700);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: var(--color-slate-300);
    transform: translateY(-2px);
}

.btn-primary-sm {
    font-size: 0.875rem;
    padding: 8px 18px;
    border-radius: var(--radius-sm);
    background-color: var(--color-teal-500);
    color: var(--color-white);
}

.btn-primary-sm:hover {
    background-color: var(--color-teal-600);
}

.btn-block {
    width: 100%;
}

/* --- 4. Header & Navigation --- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(15, 23, 42, 0.95); /* matching --color-dark-900 with opacity */
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-white);
    letter-spacing: 0.05em;
}

.logo-divider {
    width: 1px;
    height: 20px;
    background-color: var(--color-dark-700);
}

.logo-sub {
    font-size: 0.8125rem;
    color: var(--color-slate-300);
    font-weight: 500;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.main-nav a {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-slate-300);
}

.main-nav a:hover {
    color: var(--color-teal-400);
}

/* --- 5. Hero Section --- */
.hero-section {
    position: relative;
    background-color: var(--color-dark-900);
    color: var(--color-white);
    padding: 100px 0 120px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    background-size: cover;
    background-position: center;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.hero-title {
    font-size: 2.85rem;
    line-height: 1.2;
    color: var(--color-white);
    margin-bottom: 24px;
    letter-spacing: -0.01em;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--color-slate-300);
    margin-bottom: 40px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 64px;
}

/* Metrics in Hero */
.hero-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 600px;
    margin: 0 auto;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.metric-item {
    text-align: center;
}

.metric-num {
    display: block;
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--color-teal-400);
    margin-bottom: 4px;
}

.metric-label {
    font-size: 0.8125rem;
    color: var(--color-slate-300);
    text-transform: uppercase;
}

/* --- 6. Scenes Section --- */
.scenes-section {
    background-color: var(--color-white);
}

.scenes-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.scene-card {
    background: var(--color-white);
    border: var(--border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
}

.scene-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(13, 148, 136, 0.3);
}

.card-image-wrap {
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: var(--color-dark-900);
    position: relative;
    overflow: hidden;
    border-bottom: 3px solid var(--color-teal-500);
}

.card-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-normal);
}

.scene-card:hover .card-img {
    transform: scale(1.05);
}

.card-image-placeholder {
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: var(--color-dark-900);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: var(--color-slate-300);
    position: relative;
    overflow: hidden;
    border-bottom: 3px solid var(--color-teal-500);
}

.card-icon {
    width: 44px;
    height: 44px;
    color: var(--color-teal-400);
    margin-bottom: 8px;
    transition: var(--transition-normal);
}

.scene-card:hover .card-icon {
    transform: scale(1.1) rotate(5deg);
}

.img-label {
    font-size: 0.75rem;
    color: var(--color-slate-300);
}

.card-body {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.card-title {
    font-size: 1.25rem;
    margin-bottom: 12px;
    color: var(--color-dark-900);
}

.card-text {
    font-size: 0.9375rem;
    color: var(--color-slate-500);
    margin-bottom: 20px;
    line-height: 1.6;
    flex-grow: 1;
}

.card-list {
    border-top: 1px solid var(--color-slate-100);
    padding-top: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.card-list li {
    font-size: 0.8125rem;
    color: var(--color-dark-700);
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-list li::before {
    content: "●";
    color: var(--color-teal-500);
    font-size: 0.75rem;
}

/* --- 7. Selection Guide Section --- */
.selection-section {
    background-color: var(--color-slate-50);
    border-top: 1px solid var(--color-slate-100);
    border-bottom: 1px solid var(--color-slate-100);
}

.selection-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-bottom: 64px;
}

.selection-card {
    background-color: var(--color-white);
    padding: 32px;
    border-radius: var(--radius-lg);
    border: var(--border-light);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

.selection-card:hover {
    box-shadow: var(--shadow-md);
    border-color: rgba(13, 148, 136, 0.2);
}

.selection-icon-wrap {
    margin-bottom: 20px;
}

.selection-num {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-teal-500);
    background: var(--color-teal-50);
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: 1px solid rgba(13, 148, 136, 0.2);
}

.selection-card-title {
    font-size: 1.15rem;
    margin-bottom: 12px;
    color: var(--color-dark-900);
}

.selection-card-content {
    font-size: 0.9375rem;
    color: var(--color-slate-500);
    line-height: 1.6;
}

/* Technical Parameter Table */
.tech-matrix-wrap {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    border: var(--border-light);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.matrix-header {
    background-color: var(--color-dark-900);
    padding: 20px 24px;
    border-bottom: 2px solid var(--color-teal-500);
}

.matrix-header h4 {
    color: var(--color-white);
    font-size: 1.15rem;
    font-weight: 600;
}

.table-responsive {
    width: 100%;
    overflow-x: auto;
}

.tech-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    min-width: 800px;
}

.tech-table th {
    background-color: var(--color-slate-100);
    color: var(--color-dark-700);
    font-weight: 600;
    font-size: 0.875rem;
    padding: 16px 24px;
    border-bottom: 1px solid var(--color-slate-300);
    white-space: nowrap;
}

.tech-table td {
    padding: 16px 24px;
    font-size: 0.9rem;
    color: var(--color-dark-700);
    border-bottom: 1px solid var(--color-slate-100);
}

.tech-table tr:hover {
    background-color: var(--color-slate-50);
}

.tech-table tr:last-child td {
    border-bottom: none;
}

/* --- 8. FAQ Section --- */
.faq-section {
    background-color: var(--color-white);
}

.faq-list {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    border: var(--border-light);
    border-radius: var(--radius-md);
    background-color: var(--color-slate-50);
    overflow: hidden;
    transition: var(--transition-normal);
}

.faq-question {
    padding: 20px 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    cursor: pointer;
    user-select: none;
    background-color: var(--color-white);
    transition: var(--transition-fast);
}

.faq-question:hover {
    background-color: var(--color-slate-50);
}

.faq-icon {
    font-size: 1rem;
    font-weight: 800;
    background-color: var(--color-dark-900);
    color: var(--color-white);
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.faq-question h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-dark-900);
    flex-grow: 1;
}

/* FAQ Icon Indicator */
.faq-question::after {
    content: "+";
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--color-slate-500);
    transition: var(--transition-normal);
}

.faq-answer {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: all 0.3s ease-out;
    padding: 0 24px;
}

.faq-answer p {
    font-size: 0.9375rem;
    color: var(--color-slate-500);
    line-height: 1.7;
    padding-bottom: 20px;
}

/* Accordion Active States */
.faq-item.active {
    border-color: rgba(13, 148, 136, 0.4);
    box-shadow: var(--shadow-sm);
}

.faq-item.active .faq-icon {
    background-color: var(--color-teal-500);
}

.faq-item.active .faq-question::after {
    content: "−";
    transform: rotate(180deg);
    color: var(--color-teal-500);
}

.faq-item.active .faq-answer {
    max-height: 250px; /* arbitrary height enough for text */
    opacity: 1;
    padding: 16px 24px 20px 68px; /* matching layout spacing */
}

/* --- 9. Service Area Section --- */
.service-section {
    background-color: var(--color-slate-50);
    border-top: 1px solid var(--color-slate-100);
}

.service-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 48px;
    align-items: flex-start;
}

.service-info h3, .service-map-card h3 {
    font-size: 1.35rem;
    margin-bottom: 24px;
    color: var(--color-dark-900);
    position: relative;
    padding-left: 14px;
}

.service-info h3::before, .service-map-card h3::before {
    content: "";
    position: absolute;
    left: 0;
    top: 4px;
    bottom: 4px;
    width: 4px;
    background-color: var(--color-teal-500);
    border-radius: 2px;
}

.support-item {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.support-icon {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    background-color: var(--color-white);
    color: var(--color-teal-500);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    border: var(--border-light);
    box-shadow: var(--shadow-sm);
}

.support-icon svg {
    width: 20px;
    height: 20px;
}

.support-text h4 {
    font-size: 1rem;
    margin-bottom: 4px;
    color: var(--color-dark-900);
}

.support-text p {
    font-size: 0.875rem;
    color: var(--color-slate-500);
    line-height: 1.6;
}

/* Map Card */
.service-map-card {
    background-color: var(--color-white);
    border: var(--border-light);
    padding: 36px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.map-intro {
    font-size: 0.9375rem;
    color: var(--color-slate-500);
    margin-bottom: 24px;
}

.regions-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 24px;
}

.regions-list .region-tag {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-dark-700);
    background-color: var(--color-slate-50);
    border: var(--border-light);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.regions-list .region-tag:hover {
    border-color: var(--color-teal-500);
    color: var(--color-teal-500);
    background-color: var(--color-teal-5);
}

.service-commitment {
    border-top: 1px solid var(--color-slate-100);
    padding-top: 20px;
    font-size: 0.875rem;
    color: var(--color-slate-500);
}

/* --- 10. Inquiry & Lead Form Section --- */
.inquiry-section {
    background-color: var(--color-white);
}

.inquiry-box {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    background-color: var(--color-dark-900);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg), var(--shadow-teal-glow);
    border: var(--border-dark);
}

.inquiry-info {
    padding: 48px;
    background-image: radial-gradient(circle at 10% 90%, rgba(13, 148, 136, 0.15) 0%, transparent 40%);
    color: var(--color-white);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.inquiry-title {
    font-size: 2rem;
    color: var(--color-white);
    margin-bottom: 16px;
    letter-spacing: -0.01em;
}

.inquiry-subtitle {
    color: var(--color-slate-300);
    font-size: 0.9375rem;
    margin-bottom: 40px;
    line-height: 1.7;
}

.direct-contact {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-card {
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    padding: 16px 24px;
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.contact-label {
    font-size: 0.75rem;
    color: var(--color-slate-300);
    text-transform: uppercase;
}

.contact-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-teal-400);
    letter-spacing: 0.02em;
}

.qr-placeholder {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 8px;
}

.qr-icon {
    width: 64px;
    height: 64px;
    color: var(--color-slate-300);
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px dashed rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    padding: 8px;
}

.qr-code-img {
    width: 64px;
    height: 64px;
    background-color: var(--color-white);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    display: block;
    object-fit: cover;
}

.qr-text {
    font-size: 0.8125rem;
    color: var(--color-slate-300);
}

/* Form Styles */
.lead-form {
    padding: 48px;
    background-color: rgba(255, 255, 255, 0.02);
    border-left: 1px solid rgba(255, 255, 255, 0.08);
}

.form-group {
    margin-bottom: 20px;
}

.form-group-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.lead-form label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-slate-300);
    margin-bottom: 8px;
}

.lead-form label .required {
    color: var(--color-teal-400);
    margin-left: 2px;
}

.lead-form input[type="text"],
.lead-form input[type="tel"],
.lead-form select,
.lead-form textarea {
    width: 100%;
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    color: var(--color-white);
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    transition: var(--transition-fast);
}

.lead-form input:focus,
.lead-form select:focus,
.lead-form textarea:focus {
    outline: none;
    border-color: var(--color-teal-500);
    background-color: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.25);
}

.lead-form select option {
    background-color: var(--color-dark-900);
    color: var(--color-white);
}

.lead-form textarea {
    resize: vertical;
}

/* --- 11. Footer Section --- */
.site-footer {
    background-color: var(--color-dark-900);
    color: var(--color-slate-300);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 64px 0 32px 0;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.footer-top {
    display: grid;
    grid-template-columns: 1.2fr 2fr;
    gap: 64px;
    margin-bottom: 48px;
}

.footer-brand {
    max-width: 360px;
}

.footer-brand .logo-text {
    display: inline-block;
    margin-bottom: 16px;
}

.brand-desc {
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--color-slate-500);
}

.footer-brand-link {
    display: inline-block;
    margin-top: 12px;
    font-size: 0.875rem;
    color: var(--color-teal-400);
    text-decoration: none;
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.footer-brand-link:hover {
    color: var(--color-teal-300);
    text-decoration: underline;
}

.footer-links-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.links-col h4 {
    color: var(--color-white);
    font-size: 0.9375rem;
    font-weight: 600;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.links-col ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.links-col a {
    font-size: 0.875rem;
    color: var(--color-slate-500);
}

.links-col a:hover {
    color: var(--color-teal-400);
    text-decoration: underline;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 32px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: center;
    text-align: center;
}

.copyright {
    font-size: 0.8125rem;
    color: var(--color-slate-500);
}

.seo-tips {
    font-size: 0.75rem;
    color: var(--color-slate-500);
    max-width: 800px;
}

/* --- 12. Responsive Media Queries --- */

/* Tablets & Small Desktops (max-width: 1024px) */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 2.25rem;
    }
    
    .scenes-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
    
    .selection-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .service-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .inquiry-box {
        grid-template-columns: 1fr;
    }
    
    .lead-form {
        border-left: none;
        border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    
    .footer-top {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

/* Mobile Devices (max-width: 768px) */
@media (max-width: 768px) {
    .section-container {
        padding: 56px 16px;
    }
    
    .site-header {
        position: relative;
    }
    
    .header-container {
        flex-direction: column;
        gap: 16px;
        align-items: center;
        text-align: center;
    }
    
    .main-nav {
        gap: 16px;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero-title {
        font-size: 1.85rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-actions {
        flex-direction: column;
        gap: 12px;
        width: 100%;
        max-width: 320px;
        margin: 0 auto 48px auto;
    }
    
    .hero-actions .btn {
        width: 100%;
    }
    
    .hero-metrics {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .scenes-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .tech-table {
        min-width: 700px;
    }
    
    .faq-answer {
        padding: 0 16px;
    }
    
    .faq-item.active .faq-answer {
        padding: 12px 16px 16px 52px;
        max-height: 400px; /* larger max-height for wrapped text on mobile */
    }
    
    .form-group-row {
        grid-template-columns: 1fr;
        gap: 0;
    }
    
    .inquiry-info, .lead-form {
        padding: 24px;
    }
    
    .footer-links-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}

/* --- 13. Technical Topic Pages Custom Styles --- */

.topic-page {
    background-color: var(--color-slate-50);
}

.topic-main-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 24px 80px 24px;
}

.topic-hero {
    background-color: var(--color-dark-900);
    background-image: radial-gradient(circle at 80% 20%, rgba(13, 148, 136, 0.15) 0%, transparent 50%);
    color: var(--color-white);
    padding: 60px 0 60px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.topic-hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.topic-badge {
    display: inline-block;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-teal-400);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.topic-title {
    font-size: 2.25rem;
    color: var(--color-white);
    margin-bottom: 16px;
    line-height: 1.3;
}

.topic-breadcrumbs {
    font-size: 0.875rem;
    color: var(--color-slate-300);
}

.topic-breadcrumbs a {
    color: var(--color-slate-300);
    transition: var(--transition-fast);
}

.topic-breadcrumbs a:hover {
    color: var(--color-teal-400);
}

.topic-breadcrumbs span {
    color: var(--color-slate-500);
}

.topic-body-grid {
    display: grid;
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: 48px;
    margin-top: 40px;
    align-items: start;
}

.topic-content {
    background-color: var(--color-white);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: var(--border-light);
    overflow-wrap: break-word;
    word-wrap: break-word;
}

.topic-content h2 {
    font-size: 1.5rem;
    margin-top: 36px;
    margin-bottom: 16px;
    padding-left: 12px;
    border-left: 4px solid var(--color-teal-500);
    color: var(--color-dark-900);
}

.topic-content h2:first-of-type {
    margin-top: 0;
}

.topic-content h3 {
    font-size: 1.15rem;
    margin-top: 24px;
    margin-bottom: 12px;
    color: var(--color-dark-900);
}

.topic-content p {
    font-size: 0.975rem;
    color: var(--color-dark-700);
    line-height: 1.7;
    margin-bottom: 20px;
}

.topic-content ul, .topic-content ol {
    margin-bottom: 24px;
    padding-left: 20px;
}

.topic-content ul li {
    list-style-type: disc;
    margin-bottom: 8px;
    font-size: 0.975rem;
    color: var(--color-dark-700);
}

.topic-content ol li {
    list-style-type: decimal;
    margin-bottom: 8px;
    font-size: 0.975rem;
    color: var(--color-dark-700);
}

.topic-content strong {
    color: var(--color-dark-900);
    font-weight: 600;
}

.topic-content blockquote {
    background-color: var(--color-teal-50);
    border-left: 4px solid var(--color-teal-500);
    padding: 20px 24px;
    margin: 28px 0;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-size: 0.9375rem;
    color: var(--color-dark-800);
    line-height: 1.6;
}

.topic-content blockquote strong {
    color: var(--color-teal-600);
}

.topic-case-img {
    margin: 32px 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border: var(--border-light);
}

.topic-case-img img {
    width: 100%;
    height: auto;
    display: block;
}

.img-caption {
    background-color: var(--color-slate-50);
    padding: 10px 16px;
    font-size: 0.8125rem;
    color: var(--color-slate-500);
    text-align: center;
    border-top: var(--border-light);
    margin-bottom: 0 !important;
}

/* Sidebar Styling */
.topic-sidebar {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.sidebar-inquiry {
    background-color: var(--color-dark-900);
    color: var(--color-white);
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: var(--border-dark);
}

.sidebar-inquiry h3 {
    font-size: 1.25rem;
    color: var(--color-white);
    margin-bottom: 12px;
    font-weight: 700;
}

.sidebar-inquiry p {
    font-size: 0.875rem;
    color: var(--color-slate-300);
    margin-bottom: 24px;
    line-height: 1.5;
}

.sidebar-inquiry .lead-form {
    padding: 0;
    background-color: transparent;
    border-left: none;
}

.sidebar-inquiry .lead-form label {
    color: var(--color-slate-300);
    font-size: 0.75rem;
    margin-bottom: 6px;
}

.sidebar-inquiry .lead-form input,
.sidebar-inquiry .lead-form select,
.sidebar-inquiry .lead-form textarea {
    background-color: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 0.875rem;
    padding: 10px 14px;
}

.sidebar-inquiry .lead-form input:focus,
.sidebar-inquiry .lead-form select:focus,
.sidebar-inquiry .lead-form textarea:focus {
    border-color: var(--color-teal-400);
    background-color: rgba(255, 255, 255, 0.08);
}

.sidebar-contact {
    background-color: var(--color-white);
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: var(--border-light);
    text-align: center;
}

.sidebar-contact h4 {
    font-size: 1.15rem;
    color: var(--color-dark-900);
    margin-bottom: 12px;
}

.sidebar-contact .phone-num {
    display: block;
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--color-teal-500);
    margin-bottom: 6px;
}

.sidebar-contact .service-time {
    font-size: 0.8125rem;
    color: var(--color-slate-500);
    margin-bottom: 24px;
}

.sidebar-qr {
    background-color: var(--color-slate-50);
    border: 1px dashed var(--color-slate-300);
    padding: 20px;
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.sidebar-qr img {
    width: 140px;
    height: 140px;
    display: block;
}

.sidebar-qr span {
    font-size: 0.8125rem;
    color: var(--color-dark-700);
    line-height: 1.4;
    font-weight: 500;
}

/* Responsive Overrides for Technical Topics */
@media (max-width: 1024px) {
    .topic-body-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

@media (max-width: 768px) {
    .topic-main-container {
        padding: 24px 16px 60px 16px;
    }
    
    .topic-content {
        padding: 24px 16px;
    }
    
    .topic-title {
        font-size: 1.65rem;
    }
    
    .topic-hero {
        padding: 40px 0;
    }
}

/* Product Showcase Section (Left-Right layout) */
.topic-product-block {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 32px;
    background-color: var(--color-slate-50);
    border: var(--border-light);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin: 36px 0;
    align-items: center;
}

.topic-product-img-wrap {
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    background-color: var(--color-white);
    border: var(--border-light);
    aspect-ratio: 16 / 9;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
}

.topic-product-img-wrap img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
}

.topic-product-info {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.topic-product-badge {
    display: inline-block;
    align-self: start;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-teal-500);
    background-color: var(--color-teal-50);
    border: 1px solid rgba(13, 148, 136, 0.2);
    padding: 2px 10px;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
}

.topic-product-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--color-dark-900);
    margin: 0 !important;
}

.topic-product-desc {
    font-size: 0.875rem !important;
    color: var(--color-dark-700);
    line-height: 1.6;
    margin-bottom: 8px !important;
}

.topic-product-specs {
    font-size: 0.8125rem;
    color: var(--color-slate-500);
    border-top: 1px dashed var(--color-slate-300);
    padding-top: 12px;
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.topic-product-specs span {
    display: inline-block;
}

.topic-product-specs strong {
    color: var(--color-teal-600);
}

@media (max-width: 768px) {
    .topic-product-block {
        grid-template-columns: 1fr;
        gap: 24px;
        padding: 24px;
    }
}