/* ============================================
   COVALC - Chrome Extensions Portfolio
   A scientific, molecular-inspired design
   ============================================ */

/* CSS Variables */
:root {
    /* Colors - Deep space meets molecular chemistry */
    --color-bg: #0a0a0f;
    --color-bg-elevated: #12121a;
    --color-bg-card: #16161f;
    --color-surface: #1a1a24;

    --color-text: #e8e8ed;
    --color-text-muted: #8b8b99;
    --color-text-subtle: #5a5a6e;

    --color-primary: #6366f1;
    --color-primary-light: #818cf8;
    --color-primary-dark: #4f46e5;

    --color-accent-cyan: #22d3ee;
    --color-accent-purple: #a855f7;
    --color-accent-pink: #ec4899;
    --color-accent-green: #10b981;
    --color-accent-orange: #f59e0b;

    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-hover: rgba(255, 255, 255, 0.15);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent-purple) 100%);
    --gradient-glow: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
    --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.03) 0%, transparent 100%);

    /* Typography */
    --font-display: inter;
    --font-body: inter;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;

    /* Layout */
    --max-width: 1200px;
    --nav-height: 72px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-weight: 100;
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul {
    list-style: none;
}

/* ============================================
   MOLECULAR BACKGROUND CANVAS
   ============================================ */
#molecular-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: 0.4;
}

/* ============================================
   NAVIGATION
   ============================================ */
.nav-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-xl);
    height: var(--nav-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 450;
    color: var(--color-text);
    transition: transform var(--transition-fast);
}

.nav-logo:hover {
    transform: translateY(-1px);
}

.logo-image {
    height: 32px;
    width: auto;
    display: block;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.logo-icon {
    display: none;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-text);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-sm);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition-fast);
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--color-bg);
        flex-direction: column;
        justify-content: center;
        gap: var(--space-2xl);
        transform: translateX(100%);
        transition: transform var(--transition-base);
    }

    .nav-links.active {
        transform: translateX(0);
    }

    .nav-links a {
        font-size: 1.5rem;
    }
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
    font-weight: 300;
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(99, 102, 241, 0.4);
}

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

.btn-secondary:hover {
    background: var(--color-bg-card);
    border-color: var(--color-border-hover);
}

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

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

.btn-ghost {
    background: transparent;
    color: var(--color-text-muted);
    padding: 0.5rem 1rem;
}

.btn-ghost:hover {
    color: var(--color-text);
    background: rgba(255, 255, 255, 0.05);
}

.btn-chrome {
    background: white;
    color: #1a1a1a;
    font-size: 0.85rem;
    padding: 0.6rem 1.2rem;
}

.btn-chrome:hover {
    background: #f0f0f0;
    transform: translateY(-1px);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: calc(var(--nav-height) + var(--space-4xl)) var(--space-xl) var(--space-4xl);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 150%;
    height: 100%;
    background: var(--gradient-glow);
    pointer-events: none;
}

.hero-content {
    max-width: 850px;
    text-align: center;
    z-index: 1;
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--color-accent-green);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 450;
    line-height: 1.1;
    margin-bottom: var(--space-lg);
    letter-spacing: -0.02em;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.125rem;
    font-weight: 1;
    color: var(--color-text-muted);
    max-width: 540px;
    margin: 0 auto var(--space-2xl);
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

/* Hero Visual - Atomic Orbital Animation */
.hero-visual {
    position: absolute;
    right: 5%;
    top: 50%;
    transform: translateY(-50%);
    width: 400px;
    height: 400px;
    opacity: 0.6;
    pointer-events: none;
}

@media (max-width: 1200px) {
    .hero-visual {
        display: none;
    }
}

.orbital-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    border: 1px solid var(--color-primary);
    border-radius: 50%;
    opacity: 0.3;
}

.ring-1 {
    width: 200px;
    height: 200px;
    margin: -100px 0 0 -100px;
    animation: rotate 20s linear infinite;
}

.ring-2 {
    width: 280px;
    height: 280px;
    margin: -140px 0 0 -140px;
    transform: rotateX(60deg);
    animation: rotate 25s linear infinite reverse;
}

.ring-3 {
    width: 360px;
    height: 360px;
    margin: -180px 0 0 -180px;
    transform: rotateY(60deg);
    animation: rotate 30s linear infinite;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

.electron {
    position: absolute;
    width: 12px;
    height: 12px;
    background: var(--color-accent-cyan);
    border-radius: 50%;
    box-shadow: 0 0 20px var(--color-accent-cyan);
}

.electron-1 {
    animation: orbit1 8s linear infinite;
}

.electron-2 {
    animation: orbit2 10s linear infinite;
}

.electron-3 {
    animation: orbit3 12s linear infinite;
}

@keyframes orbit1 {
    from {
        transform: rotate(0deg) translateX(100px) rotate(0deg);
    }

    to {
        transform: rotate(360deg) translateX(100px) rotate(-360deg);
    }
}

@keyframes orbit2 {
    from {
        transform: rotate(120deg) translateX(140px) rotate(-120deg);
    }

    to {
        transform: rotate(480deg) translateX(140px) rotate(-480deg);
    }
}

@keyframes orbit3 {
    from {
        transform: rotate(240deg) translateX(180px) rotate(-240deg);
    }

    to {
        transform: rotate(600deg) translateX(180px) rotate(-600deg);
    }
}

.nucleus {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 30px;
    height: 30px;
    margin: -15px 0 0 -15px;
    background: var(--gradient-primary);
    border-radius: 50%;
    box-shadow: 0 0 40px rgba(99, 102, 241, 0.5);
}

/* ============================================
   SECTIONS - COMMON STYLES
   ============================================ */
section {
    padding: var(--space-4xl) var(--space-xl);
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--space-3xl);
}

.section-tag {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 100;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary-light);
    margin-bottom: var(--space-md);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 400;
    margin-bottom: var(--space-md);
    letter-spacing: -0.02em;
}

.section-description {
    font-size: 1.1rem;
    font-weight: 100;
    color: var(--color-text-muted);
}

/* ============================================
   FEATURED EXTENSIONS
   ============================================ */
.featured-section {
    max-width: var(--max-width);
    margin: 0 auto;
}

.extensions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
}

.extension-card {
    position: relative;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
}

.extension-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-card);
    pointer-events: none;
}

.extension-card:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-4px);
}

.card-glow {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 200px;
    height: 100px;
    background: radial-gradient(ellipse, rgba(99, 102, 241, 0.2) 0%, transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.extension-card:hover .card-glow {
    opacity: 1;
}

.card-content {
    position: relative;
    padding: var(--space-xl);
}

.extension-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--icon-bg, var(--gradient-primary));
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
}

.extension-icon svg {
    width: 28px;
    height: 28px;
    color: white;
}

.extension-meta {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-sm);
}

.extension-category {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary-light);
}

.extension-users {
    font-size: 0.75rem;
    color: var(--color-text-subtle);
}

.extension-name {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 200;
    margin-bottom: var(--space-sm);
}

.extension-description {
    font-size: 0.9rem;
    font-weight: 50;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: var(--space-lg);
}

.extension-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.section-cta {
    text-align: center;
    margin-top: var(--space-3xl);
}

/* ============================================
   WHY COVALC SECTION
   ============================================ */
.why-section {
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.why-container {
    max-width: var(--max-width);
    margin: 0 auto;
}

.why-content {
    text-align: center;
}

.principles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-xl);
    margin-top: var(--space-3xl);
    text-align: left;
}

.principle {
    padding: var(--space-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.principle:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.principle-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
}

.principle-icon svg {
    width: 24px;
    height: 24px;
    color: var(--color-primary-light);
}

.principle h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.principle p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ============================================
   NEWSLETTER SECTION
   ============================================ */
.newsletter-section {
    background: var(--gradient-glow);
}

.newsletter-container {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.newsletter-content h2 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 150;
    margin-bottom: var(--space-sm);
}

.newsletter-content p {
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
}

.newsletter-form {
    display: flex;
    gap: var(--space-sm);
    max-width: 440px;
    margin: 0 auto;
}

.newsletter-form input {
    flex: 1;
    padding: 0.875rem 1.25rem;
    font-size: 1rem;
    font-family: inherit;
    color: var(--color-text);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    outline: none;
    transition: border-color var(--transition-fast);
}

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

.newsletter-form input:focus {
    border-color: var(--color-primary);
}

@media (max-width: 480px) {
    .newsletter-form {
        flex-direction: column;
    }
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    padding: var(--space-4xl) var(--space-xl) var(--space-xl);
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-4xl);
}

@media (max-width: 768px) {
    .footer-container {
        flex-direction: column;
        gap: var(--space-2xl);
    }
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.footer-logo .logo-icon {
    width: 32px;
    height: 32px;
}

.footer-tagline {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.footer-links {
    display: flex;
    gap: var(--space-4xl);
}

@media (max-width: 480px) {
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

.footer-column h4 {
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text);
    margin-bottom: var(--space-md);
}

.footer-column ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-column a {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    max-width: var(--max-width);
    margin: var(--space-3xl) auto 0;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.footer-bottom p {
    font-size: 0.85rem;
    color: var(--color-text-subtle);
}

.footer-social {
    display: flex;
    gap: var(--space-md);
}

.footer-social a {
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

.footer-social a:hover {
    color: var(--color-text);
}

/* ============================================
   EXTENSIONS CATALOG PAGE
   ============================================ */
.page-header {
    padding-top: calc(var(--nav-height) + var(--space-4xl));
    padding-bottom: var(--space-2xl);
    text-align: center;
}

.page-header .section-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
}

.catalog-filters {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
    margin-bottom: var(--space-3xl);
}

.filter-btn {
    padding: 0.6rem 1.25rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-muted);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
    color: var(--color-text);
    border-color: var(--color-primary);
    background: rgba(99, 102, 241, 0.1);
}

.catalog-grid {
    max-width: var(--max-width);
    margin: 0 auto;
}

/* ============================================
   EXTENSION DETAIL PAGE
   ============================================ */
.extension-hero {
    padding-top: calc(var(--nav-height) + var(--space-3xl));
    padding-bottom: var(--space-3xl);
}

.extension-hero-content {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4xl);
    align-items: center;
}

@media (max-width: 900px) {
    .extension-hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

.extension-hero-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.extension-hero-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--icon-bg, var(--gradient-primary));
    border-radius: var(--radius-lg);
}

@media (max-width: 900px) {
    .extension-hero-icon {
        margin: 0 auto;
    }
}

.extension-hero-icon svg {
    width: 40px;
    height: 40px;
    color: white;
}

.extension-hero-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 100;
    line-height: 1.1;
}

.extension-hero-tagline {
    font-size: 1.25rem;
    color: var(--color-text-muted);
}

.extension-hero-actions {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

@media (max-width: 900px) {
    .extension-hero-actions {
        justify-content: center;
    }
}

.extension-screenshot {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    aspect-ratio: 16/10;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-subtle);
}

.extension-details {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-4xl) var(--space-xl);
}

.details-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-4xl);
}

@media (max-width: 900px) {
    .details-grid {
        grid-template-columns: 1fr;
    }
}

.details-main h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-lg);
    margin-top: var(--space-2xl);
}

.details-main h2:first-child {
    margin-top: 0;
}

.details-main p {
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: var(--space-md);
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
}

.feature-item svg {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    color: var(--color-accent-green);
    margin-top: 2px;
}

.feature-item span {
    color: var(--color-text-muted);
    line-height: 1.6;
}

.details-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.sidebar-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
}

.sidebar-card h3 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 400;
    margin-bottom: var(--space-md);
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

.info-row:last-child {
    border-bottom: none;
}

.info-label {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.info-value {
    font-weight: 600;
    font-size: 0.9rem;
}

/* Accordion / Collapsible */
.accordion {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.accordion-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.accordion-header {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    background: var(--color-surface);
    color: var(--color-text);
    font-weight: 600;
    text-align: left;
    transition: background var(--transition-fast);
}

.accordion-header:hover {
    background: var(--color-bg-card);
}

.accordion-icon {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-fast);
}

.accordion-item.active .accordion-icon {
    transform: rotate(180deg);
}

.accordion-content {
    display: none;
    padding: var(--space-lg);
    background: var(--color-bg-card);
    color: var(--color-text-muted);
    line-height: 1.7;
}

.accordion-item.active .accordion-content {
    display: block;
}

/* ============================================
   ABOUT PAGE
   ============================================ */
.about-hero {
    padding-top: calc(var(--nav-height) + var(--space-4xl));
    padding-bottom: var(--space-3xl);
    text-align: center;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--space-2xl) var(--space-xl);
}

.about-content p {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: var(--space-xl);
}

.about-content h2 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    margin-top: var(--space-3xl);
    margin-bottom: var(--space-lg);
}

.molecule-illustration {
    width: 200px;
    height: 200px;
    margin: var(--space-3xl) auto;
    position: relative;
}

/* ============================================
   CONTACT PAGE
   ============================================ */
.contact-container {
    max-width: 600px;
    margin: 0 auto;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.875rem 1rem;
    font-size: 1rem;
    font-family: inherit;
    color: var(--color-text);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    outline: none;
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-primary);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%238b8b99' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
}

.contact-info {
    margin-top: var(--space-3xl);
    padding: var(--space-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    text-align: center;
}

.contact-info p {
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.contact-info a {
    color: var(--color-primary-light);
    font-weight: 600;
}

/* ============================================
   PRIVACY & TERMS PAGES
   ============================================ */
.legal-content {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--space-2xl) var(--space-xl);
}

.legal-content h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: var(--space-3xl);
    margin-bottom: var(--space-lg);
}

.legal-content h2:first-child {
    margin-top: 0;
}

.legal-content p {
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: var(--space-md);
}

.legal-content ul {
    margin-left: var(--space-xl);
    margin-bottom: var(--space-md);
}

.legal-content li {
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: var(--space-sm);
    list-style: disc;
}

.last-updated {
    font-size: 0.9rem;
    color: var(--color-text-subtle);
    margin-bottom: var(--space-2xl);
}

/* ============================================
   UTILITIES
   ============================================ */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

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

.mt-xl {
    margin-top: var(--space-xl);
}

.mb-xl {
    margin-bottom: var(--space-xl);
}