/* ==========================================================================
   BIZMOLABS Software Studio — Official Design System
   Aesthetic: Clean Modern Light Canvas • High-Trust Engineering Studio
   Architectural Slate Surfaces • Precision Fluent Detailing • 100% Human-Crafted
   ========================================================================== */

:root {
    /* Base Surfaces */
    --bg-base: #f8fafc;
    --bg-white: #ffffff;
    --bg-surface: #ffffff;
    --bg-surface-subtle: #f1f5f9;
    --bg-surface-elevated: #ffffff;
    --bg-surface-glass: rgba(255, 255, 255, 0.92);
    --bg-section-alt: #f1f5f9;

    /* Card Surfaces */
    --bg-card: #ffffff;
    --bg-card-hover: #ffffff;
    --bg-card-border: #e2e8f0;
    --bg-card-border-hover: #cbd5e1;

    /* Borders */
    --border: #e2e8f0;
    --border-light: #edf2f7;
    --border-subtle: rgba(15, 23, 42, 0.05);
    --border-accent: rgba(0, 102, 245, 0.35);
    --border-focus: #0066f5;

    /* Typography Colors */
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-muted: #64748b;
    --text-subtle: #94a3b8;
    --text-light: #ffffff;

    /* Brand Accents */
    --brand-primary: #0066f5;
    --brand-hover: #0052cc;
    --brand-light: #eff6ff;
    --brand-soft: rgba(0, 102, 245, 0.08);
    --brand-glow: rgba(0, 102, 245, 0.16);

    --brand-emerald: #059669;
    --brand-emerald-light: #ecfdf5;
    --brand-emerald-border: #a7f3d0;

    --brand-amber: #d97706;
    --brand-amber-light: #fffbeb;
    --brand-amber-border: #fde68a;

    --brand-purple: #7c3aed;
    --brand-purple-light: #f5f3ff;
    --brand-purple-border: #ddd6fe;

    --brand-red: #dc2626;

    /* Fonts */
    --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'JetBrains Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;

    /* Metrics & Radii */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Elevation Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.03);
    --shadow-md: 0 4px 14px rgba(15, 23, 42, 0.06), 0 1px 3px rgba(15, 23, 42, 0.04);
    --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.08), 0 2px 6px rgba(15, 23, 42, 0.04);
    --shadow-card: 0 4px 16px rgba(15, 23, 42, 0.04), 0 0 0 1px var(--border);
    --shadow-card-hover: 0 12px 30px rgba(15, 23, 42, 0.08), 0 0 0 1px var(--bg-card-border-hover);

    --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    color-scheme: light;
}

body {
    background-color: var(--bg-base);
    color: var(--text-secondary);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: clip;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

/* Subtle, authentic architectural grid background */
.bg-ambient {
    display: none; /* Removed AI fuzzy neon blobs */
}

/* Container */
.container {
    width: 100%;
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography Utilities */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.025em;
}

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

.gradient-text {
    /* Human-designed, clean deep blue accent gradient instead of gaudy AI neon */
    background: linear-gradient(135deg, #0066f5 0%, #1e40af 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.gradient-text-gold {
    background: linear-gradient(135deg, #d97706 0%, #b45309 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

/* ==========================================================================
   Navigation Bar
   ========================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    background: var(--bg-surface-glass);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.96);
    border-bottom-color: #cbd5e1;
    box-shadow: 0 4px 20px rgba(15, 23, 42, 0.06);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
}

.brand-logo-img {
    height: 38px;
    width: 38px;
    border-radius: 9px;
    box-shadow: 0 2px 8px rgba(0, 31, 92, 0.22);
    object-fit: contain;
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s ease;
}

.brand:hover .brand-logo-img {
    transform: translateY(-1px) scale(1.06);
    box-shadow: 0 5px 15px rgba(0, 102, 245, 0.35);
}

.studio-logo-img {
    height: 48px;
    width: 48px;
    border-radius: 11px;
    box-shadow: 0 3px 12px rgba(0, 31, 92, 0.25);
    flex-shrink: 0;
}

.corp-banner:hover .studio-logo-img {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 6px 18px rgba(0, 102, 245, 0.35);
}

.brand-text-wrap {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.brand-name {
    font-weight: 800;
    font-size: 1.3rem;
    letter-spacing: -0.5px;
    line-height: 1.1;
    color: var(--text-primary);
}

.brand-name span {
    color: var(--brand-primary);
}

.brand-corp {
    font-size: 0.6rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
    line-height: 1;
    margin-top: 3px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.925rem;
    font-weight: 500;
    transition: var(--transition);
    padding: 6px 4px;
    position: relative;
}

.nav-link:hover {
    color: var(--brand-primary);
}

.nav-link.active {
    color: var(--brand-primary);
    font-weight: 600;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0%;
    height: 2px;
    background: var(--brand-primary);
    transition: var(--transition);
    border-radius: 2px;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-cta {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition);
    border: none;
    outline: none;
    font-family: inherit;
    line-height: 1;
}

.btn-primary {
    background: var(--brand-primary);
    color: #ffffff;
    box-shadow: 0 2px 8px rgba(0, 102, 245, 0.2);
}

.btn-primary:hover {
    background: var(--brand-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(0, 102, 245, 0.3);
    color: #ffffff;
}

.btn-secondary {
    background: #ffffff;
    border: 1px solid var(--border);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: var(--bg-surface-subtle);
    border-color: #cbd5e1;
    transform: translateY(-1px);
    color: var(--text-primary);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
}

.btn-outline:hover {
    color: var(--text-primary);
    border-color: var(--text-secondary);
    background: var(--bg-surface-subtle);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    position: relative;
    padding: 150px 0 90px;
    text-align: center;
    overflow: hidden;
    background: radial-gradient(circle at 50% 10%, #ffffff 0%, var(--bg-base) 100%);
    border-bottom: 1px solid var(--border-light);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--brand-light);
    border: 1px solid #bfdbfe;
    padding: 6px 16px;
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    font-weight: 600;
    color: #1d4ed8;
    margin-bottom: 24px;
}

.badge-pulse {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--brand-primary);
    box-shadow: 0 0 6px var(--brand-primary);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.4; transform: scale(1.3); }
}

.hero-title {
    font-size: clamp(2.4rem, 5vw, 3.6rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.035em;
    margin-bottom: 20px;
    max-width: 920px;
    margin-left: auto;
    margin-right: auto;
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 740px;
    margin: 0 auto 36px;
    line-height: 1.65;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    margin-bottom: 56px;
}

.hero-metrics {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    max-width: 1000px;
    margin: 0 auto;
    padding-top: 36px;
    border-top: 1px solid var(--border);
}

.metric-item {
    text-align: center;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 20px 14px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.metric-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: #cbd5e1;
}

.metric-number {
    font-size: 2.2rem;
    font-weight: 800;
    font-family: var(--font-mono);
    color: var(--text-primary);
    margin-bottom: 4px;
    letter-spacing: -0.5px;
    line-height: 1;
}

.metric-number span {
    color: var(--brand-primary);
}

.metric-label {
    font-size: 0.775rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ==========================================================================
   Section Headers
   ========================================================================== */
.section {
    padding: 88px 0;
    position: relative;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 52px;
}

.section-tag {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--brand-primary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
    display: inline-block;
    background: var(--brand-light);
    border: 1px solid #bfdbfe;
    padding: 4px 12px;
    border-radius: var(--radius-full);
}

.section-title {
    font-size: clamp(2rem, 3.5vw, 2.6rem);
    font-weight: 800;
    letter-spacing: -0.025em;
    line-height: 1.2;
    margin-bottom: 14px;
    color: var(--text-primary);
}

.section-desc {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ==========================================================================
   Flagship Product Spotlight (SurgeDL)
   ========================================================================== */
.product-mega-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 44px;
    box-shadow: var(--shadow-card);
    display: grid;
    grid-template-columns: 1fr 1.15fr;
    gap: 44px;
    align-items: center;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

.product-mega-card:hover {
    border-color: #cbd5e1;
    box-shadow: var(--shadow-lg);
}

.product-info {
    position: relative;
    z-index: 2;
}

.product-badge-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.badge-tag {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-live {
    background: var(--brand-emerald-light);
    color: var(--brand-emerald);
    border: 1px solid var(--brand-emerald-border);
}

.badge-version {
    background: var(--bg-surface-subtle);
    color: var(--text-muted);
    font-family: var(--font-mono);
    border: 1px solid var(--border);
}

.product-title {
    font-size: 2.1rem;
    font-weight: 800;
    margin-bottom: 14px;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.product-desc {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.65;
    margin-bottom: 24px;
}

.product-features-list {
    list-style: none;
    margin-bottom: 32px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.product-features-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.925rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.product-features-list li strong {
    color: var(--text-primary);
}

.product-features-list li .check-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--brand-light);
    color: var(--brand-primary);
    border: 1px solid #bfdbfe;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 800;
    margin-top: 2px;
}

.product-actions {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
}

/* UI / Code Mockup in Card */
.product-preview-wrap {
    position: relative;
}

.code-mockup {
    background: #0f172a; /* Authentic VS Code Dark theme */
    border: 1px solid #1e293b;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: 0 16px 40px rgba(15, 23, 42, 0.16);
}

.mockup-header {
    background: #1e293b;
    padding: 10px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid #334155;
}

.mockup-dots {
    display: flex;
    gap: 6px;
}

.mockup-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.mockup-dot.red { background: #ef4444; }
.mockup-dot.yellow { background: #f59e0b; }
.mockup-dot.green { background: #10b981; }

.mockup-title {
    font-size: 0.775rem;
    font-family: var(--font-mono);
    color: #94a3b8;
}

.mockup-body {
    padding: 20px;
    font-family: var(--font-mono);
    font-size: 0.825rem;
    line-height: 1.7;
    color: #e2e8f0;
    overflow-x: auto;
}

.code-keyword { color: #38bdf8; font-weight: 600; }
.code-fn { color: #818cf8; }
.code-str { color: #34d399; }
.code-num { color: #fbbf24; }
.code-comment { color: #64748b; font-style: italic; }

/* ==========================================================================
   Software Pipeline / Lab Innovations
   ========================================================================== */
#pipeline {
    background: var(--bg-surface-subtle);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.lab-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.lab-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    position: relative;
}

.lab-card:hover {
    transform: translateY(-3px);
    border-color: #cbd5e1;
    box-shadow: var(--shadow-md);
}

.lab-icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    background: var(--brand-light);
    border: 1px solid #bfdbfe;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    margin-bottom: 20px;
    color: var(--brand-primary);
}

.lab-card-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.lab-card-desc {
    color: var(--text-secondary);
    font-size: 0.925rem;
    line-height: 1.6;
    margin-bottom: 24px;
    flex-grow: 1;
}

.lab-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-top: 1px solid var(--border-light);
    padding-top: 16px;
    margin-top: auto;
}

.status-badge {
    font-size: 0.725rem;
    font-weight: 600;
    padding: 3px 8px;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-rnd {
    background: var(--brand-amber-light);
    color: var(--brand-amber);
    border: 1px solid var(--brand-amber-border);
}

.status-alpha {
    background: var(--brand-purple-light);
    color: var(--brand-purple);
    border: 1px solid var(--brand-purple-border);
}

.lab-tech-pill {
    font-family: var(--font-mono);
    font-size: 0.725rem;
    color: var(--text-muted);
}

/* ==========================================================================
   Engineering Principles / Core Values
   ========================================================================== */
.principles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.principle-box {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 30px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.principle-box:hover {
    border-color: #cbd5e1;
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.principle-number {
    font-family: var(--font-mono);
    font-size: 0.775rem;
    font-weight: 700;
    color: var(--brand-primary);
    margin-bottom: 12px;
    letter-spacing: 0.5px;
}

.principle-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.principle-text {
    color: var(--text-secondary);
    font-size: 0.925rem;
    line-height: 1.6;
}

/* ==========================================================================
   Corporate Legal Transparency Banner
   ========================================================================== */
.corp-banner {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 36px;
    margin-top: 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    box-shadow: var(--shadow-sm);
}

.corp-info h3 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.corp-info p {
    color: var(--text-secondary);
    font-size: 0.925rem;
    max-width: 650px;
    line-height: 1.6;
}

.corp-badges {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.corp-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: var(--bg-surface-subtle);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* ==========================================================================
   Contact & Direct Inquiries Section (High-Trust Light Card)
   ========================================================================== */
.contact-section {
    background: var(--bg-base);
    border-top: 1px solid var(--border-light);
}

.contact-card {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 44px;
    max-width: 760px;
    margin: 0 auto;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.05);
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 24px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    text-align: left;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-input, .form-textarea {
    background: #ffffff;
    border: 1px solid #cbd5e1;
    color: var(--text-primary);
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition);
    width: 100%;
}

.form-input::placeholder, .form-textarea::placeholder {
    color: var(--text-subtle);
}

.form-input:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(0, 102, 245, 0.12);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

/* ==========================================================================
   Footer (SurgeDL-Aligned Deep Slate High-Trust Authority)
   ========================================================================== */
.footer {
    border-top: 1px solid #1e293b;
    background: #0f172a;
    padding: 64px 0 32px;
    font-size: 0.875rem;
    color: #94a3b8;
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 48px;
}

.footer .brand-name {
    color: #ffffff;
}

.footer .brand-name span {
    color: #38bdf8;
}

.footer-brand-desc {
    color: #94a3b8;
    margin-top: 12px;
    line-height: 1.6;
    max-width: 320px;
    font-size: 0.875rem;
}

.footer-col-title {
    font-size: 0.8125rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    color: #94a3b8;
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.875rem;
}

.footer-links a:hover {
    color: #ffffff;
    transform: translateX(2px);
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 24px;
    border-top: 1px solid #1e293b;
    font-size: 0.8125rem;
    color: #64748b;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-legal-tag {
    font-family: var(--font-mono);
    color: #94a3b8;
}

/* ==========================================================================
   FAQ Section & Accordion (SEO & Knowledge Transparency)
   ========================================================================== */
.faq-container {
    max-width: 860px;
    margin: 0 auto;
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-top: 36px;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.faq-item:hover {
    border-color: #cbd5e1;
    box-shadow: var(--shadow-md);
}

.faq-item[open] {
    border-color: var(--brand-primary);
    box-shadow: 0 4px 16px rgba(0, 102, 245, 0.08);
}

.faq-question {
    padding: 20px 24px;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    user-select: none;
    list-style: none;
}

.faq-question::-webkit-details-marker {
    display: none;
}

.faq-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--brand-primary);
    transition: transform 0.2s ease;
    font-weight: 700;
    font-size: 1.25rem;
    line-height: 1;
}

.faq-item[open] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 24px 22px 24px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.75;
    border-top: 1px solid #f1f5f9;
    margin-top: 4px;
    padding-top: 16px;
}

.faq-answer a {
    color: var(--brand-primary);
    text-decoration: underline;
    font-weight: 600;
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 1024px) {
    .hero-title { font-size: 2.8rem; }
    .product-mega-card { grid-template-columns: 1fr; }
    .lab-grid { grid-template-columns: repeat(2, 1fr); }
    .principles-grid { grid-template-columns: 1fr; }
    .footer-top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero-title { font-size: 2.2rem; }
    .hero-subtitle { font-size: 1rem; }
    .hero-metrics { grid-template-columns: repeat(2, 1fr); }
    .lab-grid { grid-template-columns: 1fr; }
    .form-grid { grid-template-columns: 1fr; }
    .corp-banner { flex-direction: column; text-align: center; }
    .footer-top { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
    .product-mega-card { padding: 28px; }
    .contact-card { padding: 28px; }
}