/* ============================================
   Kevin Tsai — XRI Fitness
   Dark Industrial Premium Theme
   ============================================ */

/* --- CSS Variables --- */
:root {
    --color-bg: #0a0a0a;
    --color-bg-elevated: #111111;
    --color-bg-card: #161616;
    --color-bg-card-hover: #1c1c1c;
    --color-text: #e8e8e8;
    --color-text-secondary: #a0a0a0;
    --color-text-muted: #666666;
    --color-accent: #c9a84c;
    --color-accent-dim: #8b7330;
    --color-accent-glow: rgba(201, 168, 76, 0.15);
    --color-border: #1f1f1f;
    --color-border-light: #2a2a2a;
    --color-nav-bg: rgba(10, 10, 10, 0.9);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    --radius: 4px;
    --radius-sm: 2px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
    --header-height: 72px;
}

/* Light mode override */
[data-theme="light"] {
    --color-bg: #f5f5f5;
    --color-bg-elevated: #ffffff;
    --color-bg-card: #ffffff;
    --color-bg-card-hover: #fafafa;
    --color-text: #111111;
    --color-text-secondary: #555555;
    --color-text-muted: #888888;
    --color-accent: #b8942b;
    --color-accent-dim: #8b7330;
    --color-accent-glow: rgba(184, 148, 43, 0.08);
    --color-border: #e0e0e0;
    --color-border-light: #eeeeee;
    --color-nav-bg: rgba(255, 255, 255, 0.9);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(201, 168, 76, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(201, 168, 76, 0.02) 0%, transparent 50%),
        radial-gradient(circle at 50% 80%, rgba(255, 255, 255, 0.01) 0%, transparent 50%);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

[data-theme="light"] body {
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(184, 148, 43, 0.04) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(184, 148, 43, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 50% 80%, rgba(0, 0, 0, 0.02) 0%, transparent 50%);
}

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

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

img { max-width: 100%; display: block; }
ul { list-style: none; }

/* --- Container --- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 32px;
}

/* --- Section --- */
.section {
    padding: 120px 0;
    position: relative;
}

.section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-border-light), transparent);
}

.section:first-of-type::before {
    display: none;
}

/* Alternating section backgrounds */
.views,
.journal,
.lifestyle,
.manufacturing {
    background: var(--color-bg);
}

.about,
.business,
.products,
.gallery,
.contact {
    background-color: var(--color-bg-elevated);
    background-image: 
        radial-gradient(circle at 70% 30%, rgba(201, 168, 76, 0.02) 0%, transparent 50%),
        repeating-linear-gradient(45deg, transparent, transparent 30px, rgba(255,255,255,0.005) 30px, rgba(255,255,255,0.005) 31px);
}

[data-theme="light"] .about,
[data-theme="light"] .business,
[data-theme="light"] .products,
[data-theme="light"] .gallery,
[data-theme="light"] .contact {
    background-image: 
        radial-gradient(circle at 70% 30%, rgba(184, 148, 43, 0.03) 0%, transparent 50%),
        repeating-linear-gradient(45deg, transparent, transparent 30px, rgba(0,0,0,0.015) 30px, rgba(0,0,0,0.015) 31px);
}

.section-label {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 16px;
}

.section-title {
    font-size: 2.75rem;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.5px;
    margin-bottom: 16px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--color-accent);
    margin-top: 16px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    margin-bottom: 48px;
    max-width: 560px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 48px;
}

.view-all {
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--color-accent);
}

.view-all:hover {
    color: var(--color-text);
}

/* --- Header --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--color-nav-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid transparent;
    z-index: 1000;
    transition: all var(--transition);
}

.header.scrolled {
    border-bottom-color: var(--color-border);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--color-text);
}

.logo:hover {
    color: var(--color-accent);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-list {
    display: flex;
    gap: 2px;
}

.nav-link {
    display: inline-block;
    padding: 8px 14px;
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    transition: all var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-accent);
}

/* Language toggle */
.lang-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: none;
    border: 1px solid var(--color-border);
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 700;
    transition: all var(--transition);
    color: var(--color-text);
    font-family: var(--font-sans);
}

.lang-toggle:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* Theme toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: none;
    border: 1px solid var(--color-border);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all var(--transition);
    color: var(--color-text);
}

.theme-toggle:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* Hamburger */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
}

.menu-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Hero --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--color-bg);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0.35;
    transition: opacity 0.8s ease;
    z-index: 0;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        linear-gradient(180deg, rgba(10,10,10,0.4) 0%, rgba(10,10,10,0.8) 100%),
        radial-gradient(ellipse at 60% 30%, var(--color-accent-glow) 0%, transparent 50%),
        radial-gradient(ellipse at 30% 70%, rgba(255,255,255,0.02) 0%, transparent 40%),
        radial-gradient(ellipse at 80% 80%, rgba(201,168,76,0.04) 0%, transparent 40%);
    pointer-events: none;
    z-index: 1;
    animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
    0% { opacity: 0.7; }
    100% { opacity: 1; }
}

/* Subtle grain overlay */
.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
    background-size: 256px 256px;
    pointer-events: none;
    z-index: 2;
    opacity: 0.5;
}

.hero .container {
    position: relative;
    z-index: 3;
}

.hero-content {
    max-width: 720px;
}

.hero-eyebrow {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 20px;
}

.hero-title {
    font-size: 5rem;
    font-weight: 800;
    line-height: 1;
    letter-spacing: -2px;
    margin-bottom: 16px;
    color: var(--color-text);
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
    line-height: 1.4;
    max-width: 540px;
}

.hero-desc {
    font-size: 1rem;
    color: var(--color-text-muted);
    margin-bottom: 40px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    font-size: 0.65rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--color-text-muted);
    z-index: 3;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: var(--color-border-light);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    padding: 14px 32px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    transition: all var(--transition);
    cursor: pointer;
    border: 1px solid transparent;
    font-family: var(--font-sans);
}

.btn-primary {
    background: var(--color-accent);
    color: #0a0a0a;
    border-color: var(--color-accent);
}

.btn-primary:hover {
    background: transparent;
    color: var(--color-accent);
}

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

.btn-outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* --- About --- */
.about-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 64px;
    align-items: start;
}

.about-text .lead {
    font-size: 1.15rem;
    color: var(--color-text);
    margin-bottom: 20px;
    line-height: 1.7;
}

.about-text p {
    color: var(--color-text-secondary);
    margin-bottom: 16px;
    font-size: 0.95rem;
}

.about-text .highlight {
    padding: 20px 24px;
    border-left: 2px solid var(--color-accent);
    background: var(--color-bg-card);
    color: var(--color-text);
    font-size: 1rem;
    margin-top: 24px;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.stat-item {
    padding: 28px 20px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    text-align: center;
    transition: all var(--transition);
}

.stat-item:hover {
    border-color: var(--color-accent);
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-accent);
    line-height: 1.2;
    font-family: var(--font-mono);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 4px;
}

/* --- Views / Philosophy --- */
.views {
    background: var(--color-bg);
}

.views-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 16px;
    margin-bottom: 56px;
}

.view-card {
    padding: 40px 32px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.view-card:hover {
    border-color: var(--color-accent);
    background: var(--color-bg-card-hover);
}

.view-number {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-accent);
    letter-spacing: 2px;
    margin-bottom: 16px;
    font-family: var(--font-mono);
}

.view-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--color-text);
}

.view-card p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.views-quote-block {
    text-align: center;
    padding: 48px 32px;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.views-quote-block blockquote p {
    font-size: 1.5rem;
    font-weight: 300;
    font-style: italic;
    color: var(--color-text);
    line-height: 1.5;
    max-width: 640px;
    margin: 0 auto 16px;
}

.views-quote-block blockquote cite {
    font-size: 0.8rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--color-text-muted);
    font-style: normal;
}

/* --- Business --- */
.business {
    /* background handled by .section alternating pattern */
}

.business-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
}

.business-card {
    padding: 36px 28px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.business-card-link {
    color: inherit;
    display: block;
}

.business-card-link:hover {
    color: inherit;
}

.business-card:hover {
    border-color: var(--color-accent);
    background: var(--color-bg-card-hover);
}

.business-icon {
    font-size: 1.5rem;
    margin-bottom: 16px;
}

.business-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-text);
}

.business-card p {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.business-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-top: 48px;
    padding: 20px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    flex-wrap: wrap;
}

.business-flow span {
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--color-text-secondary);
}

.flow-arrow {
    color: var(--color-accent) !important;
    font-size: 1rem !important;
}

/* --- Workbench --- */
.workbench-card {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-top: 24px;
    padding: 32px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-accent);
    transition: all var(--transition);
    color: var(--color-text);
    text-decoration: none;
}

.workbench-card:hover {
    background: var(--color-bg-card-hover);
    color: var(--color-text);
    box-shadow: 0 0 20px var(--color-accent-glow);
}

.workbench-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
}

.workbench-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--color-text);
}

.workbench-content p {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
    line-height: 1.6;
}

.workbench-link {
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--color-accent);
}

@media (max-width: 600px) {
    .workbench-card {
        flex-direction: column;
        text-align: center;
    }
}

/* --- Manufacturing --- */
.mfg-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 16px;
}

.mfg-item {
    padding: 36px 28px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.mfg-item:hover {
    border-color: var(--color-accent);
}

.mfg-number {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-accent);
    letter-spacing: 2px;
    margin-bottom: 12px;
    font-family: var(--font-mono);
}

.mfg-item h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-text);
}

.mfg-item p {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* --- Products --- */
.products {
    /* background handled by .section alternating pattern */
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 16px;
}

.product-card {
    padding: 32px 24px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    text-align: center;
    transition: all var(--transition);
}

.product-card:hover {
    border-color: var(--color-accent);
}

.product-img {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.product-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--color-text);
}

.product-card p {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* --- Journal --- */
.journal-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 16px;
}

.journal-card {
    padding: 32px 28px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
    cursor: pointer;
}

.journal-card:hover {
    border-color: var(--color-accent);
    background: var(--color-bg-card-hover);
}

.journal-date {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 12px;
}

.journal-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 10px;
    line-height: 1.4;
    color: var(--color-text);
}

.journal-card p {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-bottom: 16px;
    line-height: 1.6;
}

.journal-link {
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--color-accent);
}

/* --- Lifestyle --- */
.lifestyle-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
}

.lifestyle-card {
    padding: 40px 24px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    text-align: center;
    transition: all var(--transition);
}

.lifestyle-card:hover {
    border-color: var(--color-accent);
}

.lifestyle-img {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.lifestyle-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--color-text);
}

.lifestyle-card p {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* --- Gallery --- */
.gallery {
    /* background handled by .section alternating pattern */
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.gallery-item {
    position: relative;
    overflow: hidden;
    border: 1px solid var(--color-border);
    background: var(--color-bg-card);
    transition: all var(--transition);
}

.gallery-item:hover {
    border-color: var(--color-accent);
}

.gallery-item img {
    width: 100%;
    height: 240px;
    object-fit: cover;
    display: block;
}

.gallery-item .gallery-caption {
    padding: 12px 16px;
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* --- Contact --- */
.contact {
    /* background handled by .section alternating pattern */
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
}

.contact-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 36px 20px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
    text-align: center;
    color: var(--color-text);
}

.contact-card:hover {
    border-color: var(--color-accent);
    color: var(--color-text);
}

.contact-icon {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.contact-card h3 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.contact-card p {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* --- Footer --- */
.footer {
    padding: 64px 0 32px;
    border-top: 1px solid var(--color-border);
    background: var(--color-bg);
}

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

.footer-brand h3 {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 4px;
}

.footer-brand p {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.footer-links h4 {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: 16px;
}

.footer-links a {
    display: block;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
    transition: color var(--transition);
}

.footer-links a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* --- Back to Top --- */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    background: var(--color-accent);
    color: #0a0a0a;
    border: none;
    font-size: 1.1rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: all var(--transition);
    z-index: 999;
    font-weight: 700;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-text);
    color: var(--color-bg);
}

/* --- Animations --- */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 900px) {
    .hero-title {
        font-size: 3rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }

    .menu-toggle {
        display: flex;
    }

    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--color-bg-card);
        padding: 80px 24px 24px;
        border-left: 1px solid var(--color-border);
        transition: right var(--transition);
    }

    .nav.open {
        right: 0;
    }

    .nav-list {
        flex-direction: column;
        gap: 2px;
    }

    .nav-link {
        display: block;
        padding: 14px 16px;
        font-size: 0.9rem;
    }
}

@media (max-width: 600px) {
    .container {
        padding: 0 20px;
    }

    .hero {
        min-height: 90vh;
    }

    .hero-title {
        font-size: 2.5rem;
        letter-spacing: -1px;
    }

    .hero-subtitle {
        font-size: 1.05rem;
    }

    .section {
        padding: 80px 0;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .about-stats {
        grid-template-columns: 1fr 1fr;
    }

    .business-grid,
    .mfg-grid,
    .journal-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .business-flow {
        flex-direction: column;
        gap: 8px;
    }

    .flow-arrow {
        transform: rotate(90deg);
    }
}

@media (min-width: 1600px) {
    .hero-title {
        font-size: 6rem;
    }
}