/* ============================================
   YAOCHEN - Brand Website Stylesheet
   曜尘新材料科技（上海）有限公司
   ============================================ */

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

:root {
    --color-primary: #16314F;
    --color-primary-light: #1E4A73;
    --color-primary-dark: #0E2235;
    --color-accent: #C8923C;
    --color-accent-light: #D9A85A;
    --color-accent-dark: #A6762A;
    --color-text: #1a1a1a;
    --color-text-light: #5a5a5a;
    --color-text-muted: #8a8a8a;
    --color-bg: #ffffff;
    --color-bg-alt: #f5f7fa;
    --color-bg-dark: #0E2235;
    --color-border: #e0e3e8;
    --color-white: #ffffff;
    --color-success: #2d8659;
    --color-overlay: rgba(14, 34, 53, 0.75);

    --font-sans: 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
    --font-serif: 'Georgia', 'Songti SC', serif;

    --container-max: 1280px;
    --header-height: 80px;
    --radius: 4px;
    --radius-lg: 8px;
    --transition: 0.3s ease;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.15);
}

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

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    overflow-x: hidden;
}

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

ul, ol {
    list-style: none;
}

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

/* ---------- Container ---------- */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 40px;
}

@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }
}

/* ---------- Header ---------- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: all var(--transition);
}

.site-header.scrolled {
    box-shadow: var(--shadow-sm);
}

.header-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 40px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 2px;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo .logo-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-primary);
    color: var(--color-accent);
    border-radius: var(--radius);
    font-size: 1.2rem;
    font-weight: 900;
}

.logo .logo-text {
    font-size: 1.1rem;
    line-height: 1.2;
}

.logo .logo-text .sub {
    font-size: 0.65rem;
    font-weight: 400;
    color: var(--color-text-muted);
    letter-spacing: 1px;
}

/* Nav */
.main-nav {
    display: flex;
    align-items: center;
    gap: 36px;
}

.main-nav .nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    position: relative;
    padding: 6px 0;
}

.main-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition);
}

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

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

/* Header actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

.lang-switch {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    cursor: pointer;
    user-select: none;
}

.lang-switch span {
    color: var(--color-text-muted);
    transition: color var(--transition);
}

.lang-switch span.active {
    color: var(--color-primary);
    font-weight: 600;
}

.lang-switch .divider {
    color: var(--color-border);
}

.btn-contact {
    background: var(--color-primary);
    color: var(--color-white);
    padding: 10px 24px;
    border-radius: var(--radius);
    font-size: 0.85rem;
    font-weight: 600;
    transition: all var(--transition);
}

.btn-contact:hover {
    background: var(--color-accent);
    transform: translateY(-1px);
}

/* Mobile menu toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 5px;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition);
}

.menu-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

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

.menu-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 1024px) {
    .main-nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        padding: 30px 40px;
        gap: 20px;
        transform: translateY(-150%);
        transition: transform var(--transition);
        box-shadow: var(--shadow-md);
    }
    .main-nav.open {
        transform: translateY(0);
    }
    .menu-toggle {
        display: flex;
    }
    .header-actions {
        gap: 16px;
    }
    .btn-contact {
        display: none;
    }
}

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

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        linear-gradient(135deg, rgba(14, 34, 53, 0.85) 0%, rgba(22, 49, 79, 0.7) 50%, rgba(30, 74, 115, 0.6) 100%),
        url('../images/hero-bg.jpg') center/cover no-repeat;
    z-index: 1;
}

.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        repeating-linear-gradient(0deg, transparent, transparent 39px, rgba(255,255,255,0.03) 39px, rgba(255,255,255,0.03) 40px),
        repeating-linear-gradient(90deg, transparent, transparent 39px, rgba(255,255,255,0.03) 39px, rgba(255,255,255,0.03) 40px);
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 3;
    color: var(--color-white);
    max-width: 760px;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(200, 146, 60, 0.15);
    border: 1px solid rgba(200, 146, 60, 0.4);
    color: var(--color-accent-light);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 24px;
    letter-spacing: 1px;
}

.hero-tag::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--color-accent);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.3); }
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.hero-title .accent {
    color: var(--color-accent);
}

.hero-subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 40px;
    line-height: 1.8;
    max-width: 600px;
}

.hero-actions {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--color-accent);
    color: var(--color-white);
    padding: 14px 32px;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 600;
    transition: all var(--transition);
}

.btn-primary:hover {
    background: var(--color-accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(200, 146, 60, 0.4);
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: var(--color-white);
    padding: 12px 32px;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 500;
    transition: all var(--transition);
}

.btn-outline:hover {
    border-color: var(--color-white);
    background: rgba(255, 255, 255, 0.1);
}

.hero-stats {
    position: relative;
    z-index: 3;
    display: flex;
    gap: 60px;
    margin-top: 80px;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.hero-stat .num {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-accent);
    line-height: 1;
}

.hero-stat .label {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.6);
    margin-top: 8px;
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.2rem;
    }
    .hero-subtitle {
        font-size: 1rem;
    }
    .hero-stats {
        gap: 30px;
        flex-wrap: wrap;
    }
    .hero-stat .num {
        font-size: 1.8rem;
    }
}

/* ---------- Section Common ---------- */
.section {
    padding: 100px 0;
}

.section-alt {
    background: var(--color-bg-alt);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-eyebrow {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-accent);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.section-title {
    font-size: 2.4rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.3;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--color-text-light);
    max-width: 680px;
    margin: 0 auto;
    line-height: 1.8;
}

@media (max-width: 768px) {
    .section {
        padding: 60px 0;
    }
    .section-title {
        font-size: 1.8rem;
    }
}

/* ---------- About Summary (Home) ---------- */
.about-summary {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-summary .about-visual {
    position: relative;
    aspect-ratio: 4/5;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: url('../images/about-lab.jpg') center/cover no-repeat;
}

.about-summary .about-visual::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 30% 20%, rgba(200, 146, 60, 0.3) 0%, transparent 40%),
        radial-gradient(circle at 70% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 40%);
}

.about-summary .about-visual .visual-text {
    position: absolute;
    bottom: 40px;
    left: 40px;
    color: var(--color-white);
    z-index: 2;
}

.about-summary .about-visual .visual-text .big {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.1;
}

.about-summary .about-visual .visual-text .small {
    font-size: 0.9rem;
    opacity: 0.7;
    margin-top: 8px;
    letter-spacing: 2px;
}

.about-summary .about-text h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 24px;
    line-height: 1.3;
}

.about-summary .about-text p {
    color: var(--color-text-light);
    margin-bottom: 20px;
    line-height: 1.9;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 30px 0;
}

.about-feature {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.about-feature .icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background: var(--color-bg-alt);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    font-size: 1.2rem;
}

.about-feature .text strong {
    display: block;
    font-size: 0.9rem;
    color: var(--color-text);
    margin-bottom: 4px;
}

.about-feature .text span {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

@media (max-width: 768px) {
    .about-summary {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

/* ---------- Solutions Cards ---------- */
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.solution-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
    border: 1px solid var(--color-border);
}

.solution-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-accent);
}

.solution-card .card-visual {
    height: 240px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.solution-card .card-visual .pattern {
    position: absolute;
    inset: 0;
    opacity: 0.9;
}

.solution-card .card-visual .card-icon {
    position: relative;
    z-index: 2;
    font-size: 3rem;
    color: var(--color-white);
    opacity: 0.9;
}

.solution-card .card-body {
    padding: 32px;
}

.solution-card .card-eyebrow {
    font-size: 0.75rem;
    color: var(--color-accent);
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.solution-card .card-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 16px;
}

.solution-card .card-desc {
    font-size: 0.9rem;
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: 20px;
}

.solution-card .card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
    transition: gap var(--transition);
}

.solution-card .card-link:hover {
    gap: 12px;
    color: var(--color-accent);
}

/* Pattern backgrounds for cards */
.pattern-leather {
    background: linear-gradient(135deg, rgba(61, 31, 15, 0.7) 0%, rgba(107, 58, 30, 0.6) 50%, rgba(139, 90, 43, 0.5) 100%),
                url('../images/solution-leather.jpg') center/cover no-repeat;
}
.pattern-leather::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 20% 30%, rgba(200, 146, 60, 0.2) 0%, transparent 30%),
        radial-gradient(circle at 80% 70%, rgba(139, 69, 19, 0.3) 0%, transparent 30%);
}

.pattern-acrylic {
    background: linear-gradient(135deg, rgba(13, 59, 78, 0.7) 0%, rgba(26, 107, 122, 0.6) 50%, rgba(46, 155, 170, 0.5) 100%),
                url('../images/solution-resin.jpg') center/cover no-repeat;
}
.pattern-acrylic::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
        repeating-linear-gradient(45deg, transparent, transparent 20px, rgba(255,255,255,0.05) 20px, rgba(255,255,255,0.05) 40px);
}

.pattern-solvent {
    background: linear-gradient(135deg, rgba(26, 43, 60, 0.7) 0%, rgba(46, 74, 107, 0.6) 50%, rgba(74, 107, 142, 0.5) 100%),
                url('../images/solution-coating.jpg') center/cover no-repeat;
}
.pattern-solvent::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 50% 50%, rgba(200, 146, 60, 0.15) 0%, transparent 50%),
        repeating-linear-gradient(90deg, transparent, transparent 30px, rgba(255,255,255,0.03) 30px, rgba(255,255,255,0.03) 31px);
}

.pattern-pcb {
    background: linear-gradient(135deg, rgba(10, 40, 30, 0.7) 0%, rgba(20, 80, 60, 0.6) 50%, rgba(30, 120, 90, 0.5) 100%),
                url('../images/solution-pcb.jpg') center/cover no-repeat;
}
.pattern-pcb::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 30% 40%, rgba(46, 155, 170, 0.2) 0%, transparent 40%),
        repeating-linear-gradient(0deg, transparent, transparent 15px, rgba(255,255,255,0.04) 15px, rgba(255,255,255,0.04) 16px);
}

@media (max-width: 1200px) {
    .solutions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .solutions-grid {
        grid-template-columns: 1fr;
    }
}

/* ---------- Sustainability Section ---------- */
.sustainability-banner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.sustainability-banner .banner-visual {
    background: linear-gradient(135deg, rgba(26, 77, 51, 0.85) 0%, rgba(45, 125, 82, 0.8) 50%, rgba(74, 157, 111, 0.75) 100%),
                url('../images/sustainability.jpg') center/cover no-repeat;
    padding: 60px;
    color: var(--color-white);
    position: relative;
    overflow: hidden;
}

.sustainability-banner .banner-visual::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 70% 30%, rgba(255, 255, 255, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 30% 70%, rgba(200, 146, 60, 0.15) 0%, transparent 40%);
}

.sustainability-banner .banner-visual .content {
    position: relative;
    z-index: 2;
}

.sustainability-banner .banner-visual h3 {
    font-size: 1.8rem;
    margin-bottom: 16px;
    font-weight: 700;
}

.sustainability-banner .banner-visual p {
    opacity: 0.85;
    line-height: 1.8;
}

.sustainability-banner .banner-text {
    background: var(--color-white);
    padding: 60px;
}

.sustainability-banner .banner-text .eco-item {
    margin-bottom: 24px;
}

.sustainability-banner .banner-text .eco-item:last-child {
    margin-bottom: 0;
}

.sustainability-banner .banner-text .eco-item h4 {
    font-size: 1.05rem;
    color: var(--color-primary);
    margin-bottom: 8px;
    font-weight: 600;
}

.sustainability-banner .banner-text .eco-item p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

@media (max-width: 768px) {
    .sustainability-banner {
        grid-template-columns: 1fr;
    }
    .sustainability-banner .banner-visual,
    .sustainability-banner .banner-text {
        padding: 30px;
    }
}

/* ---------- News Section ---------- */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.news-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
    border: 1px solid var(--color-border);
}

.news-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.news-card .news-visual {
    height: 200px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    position: relative;
    overflow: hidden;
}

.news-card .news-visual::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 50% 50%, rgba(200, 146, 60, 0.2) 0%, transparent 50%);
}

.news-card .news-visual .news-date {
    position: absolute;
    bottom: 16px;
    left: 16px;
    z-index: 2;
    color: var(--color-white);
    font-size: 0.8rem;
    opacity: 0.8;
}

.news-card .news-body {
    padding: 24px;
}

.news-card .news-category {
    font-size: 0.7rem;
    color: var(--color-accent);
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.news-card .news-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 12px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-card .news-excerpt {
    font-size: 0.85rem;
    color: var(--color-text-light);
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

@media (max-width: 768px) {
    .news-grid {
        grid-template-columns: 1fr;
    }
}

/* ---------- CTA Section ---------- */
.cta-section {
    background: linear-gradient(135deg, rgba(14, 34, 53, 0.9) 0%, rgba(22, 49, 79, 0.85) 100%),
                url('../images/cta-bg.jpg') center/cover no-repeat;
    padding: 80px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 30% 50%, rgba(200, 146, 60, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 70% 50%, rgba(30, 74, 115, 0.3) 0%, transparent 50%);
}

.cta-section .container {
    position: relative;
    z-index: 2;
}

.cta-section h2 {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 16px;
}

.cta-section p {
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 32px;
}

/* ---------- Page Banner (Inner pages) ---------- */
.page-banner {
    height: 400px;
    background: var(--color-primary-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
    margin-top: var(--header-height);
}

.page-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse at 30% 30%, rgba(200, 146, 60, 0.12) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 70%, rgba(30, 74, 115, 0.3) 0%, transparent 50%),
        linear-gradient(135deg, #0E2235 0%, #16314F 100%);
}

.page-banner::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
        repeating-linear-gradient(0deg, transparent, transparent 39px, rgba(255,255,255,0.03) 39px, rgba(255,255,255,0.03) 40px),
        repeating-linear-gradient(90deg, transparent, transparent 39px, rgba(255,255,255,0.03) 39px, rgba(255,255,255,0.03) 40px);
}

.page-banner .banner-content {
    position: relative;
    z-index: 2;
    color: var(--color-white);
}

.page-banner .banner-eyebrow {
    font-size: 0.8rem;
    color: var(--color-accent);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 16px;
    font-weight: 600;
}

.page-banner h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 16px;
}

.page-banner p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.7);
    max-width: 600px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .page-banner {
        height: 300px;
    }
    .page-banner h1 {
        font-size: 2rem;
    }
    .page-banner p {
        font-size: 0.95rem;
    }
}

/* ---------- About Page ---------- */
.about-intro {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-intro .intro-text h2 {
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: 24px;
}

.about-intro .intro-text p {
    color: var(--color-text-light);
    margin-bottom: 20px;
    line-height: 1.9;
}

.about-intro .intro-visual {
    aspect-ratio: 1/1;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, rgba(22, 49, 79, 0.6) 0%, rgba(30, 74, 115, 0.5) 100%),
                url('../images/about-lab.jpg') center/cover no-repeat;
    position: relative;
    overflow: hidden;
}

.about-intro .intro-visual::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 30% 30%, rgba(200, 146, 60, 0.25) 0%, transparent 40%),
        radial-gradient(circle at 70% 70%, rgba(255, 255, 255, 0.08) 0%, transparent 40%);
}

.about-intro .intro-visual .visual-label {
    position: absolute;
    bottom: 30px;
    left: 30px;
    color: var(--color-white);
    z-index: 2;
}

.about-intro .intro-visual .visual-label .big {
    font-size: 2.5rem;
    font-weight: 800;
}

.about-intro .intro-visual .visual-label .small {
    font-size: 0.85rem;
    opacity: 0.7;
    margin-top: 6px;
}

/* Values grid */
.values-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.value-card {
    text-align: center;
    padding: 40px 30px;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.value-card:hover {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.value-card .value-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 24px;
    background: var(--color-bg-alt);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    color: var(--color-accent);
}

.value-card h3 {
    font-size: 1.15rem;
    color: var(--color-primary);
    margin-bottom: 12px;
}

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

/* Timeline */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    width: 50%;
    padding: 0 40px 50px;
}

.timeline-item:nth-child(odd) {
    left: 0;
    text-align: right;
}

.timeline-item:nth-child(even) {
    left: 50%;
}

.timeline-item::before {
    content: '';
    position: absolute;
    top: 6px;
    width: 14px;
    height: 14px;
    background: var(--color-accent);
    border-radius: 50%;
    border: 3px solid var(--color-white);
    box-shadow: 0 0 0 2px var(--color-accent);
}

.timeline-item:nth-child(odd)::before {
    right: -7px;
}

.timeline-item:nth-child(even)::before {
    left: -7px;
}

.timeline-item .year {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-accent);
    margin-bottom: 8px;
}

.timeline-item .title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.timeline-item .desc {
    font-size: 0.85rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

@media (max-width: 768px) {
    .about-intro,
    .values-grid {
        grid-template-columns: 1fr;
    }
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    .about-stat-item {
        padding: 20px 12px;
    }
    .about-stat-item .stat-num {
        font-size: 1.8rem;
    }
    .timeline::before {
        left: 20px;
    }
    .timeline-item {
        width: 100%;
        left: 0 !important;
        text-align: left !important;
        padding-left: 50px;
        padding-right: 0;
    }
    .timeline-item::before {
        left: 13px !important;
        right: auto !important;
    }
}

/* About Stats */
.about-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.about-stat-item {
    text-align: center;
    padding: 30px 20px;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.about-stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.about-stat-item .stat-num {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1.2;
    margin-bottom: 8px;
}

.about-stat-item .stat-prefix,
.about-stat-item .stat-suffix {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--color-accent);
}

.about-stat-item .stat-unit {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-text-light);
    margin-left: 2px;
}

.about-stat-item .stat-label {
    font-size: 0.85rem;
    color: var(--color-text-light);
    font-weight: 500;
}

/* ---------- Solutions Page ---------- */
.solution-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 100px;
}

.solution-detail:last-child {
    margin-bottom: 0;
}

.solution-detail:nth-child(even) .detail-visual {
    order: 2;
}

.solution-detail .detail-visual {
    aspect-ratio: 5/4;
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
}

.solution-detail .detail-text .detail-eyebrow {
    font-size: 0.8rem;
    color: var(--color-accent);
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.solution-detail .detail-text h3 {
    font-size: 1.8rem;
    color: var(--color-primary);
    margin-bottom: 20px;
}

.solution-detail .detail-text p {
    color: var(--color-text-light);
    margin-bottom: 16px;
    line-height: 1.9;
}

.solution-detail .detail-list {
    margin-top: 24px;
}

.solution-detail .detail-list li {
    padding: 8px 0;
    padding-left: 28px;
    position: relative;
    color: var(--color-text);
    font-size: 0.9rem;
}

.solution-detail .detail-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 14px;
    width: 16px;
    height: 2px;
    background: var(--color-accent);
}

@media (max-width: 768px) {
    .solution-detail {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    .solution-detail:nth-child(even) .detail-visual {
        order: 0;
    }
}

/* ---------- Sustainability Page ---------- */
.sustain-hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.sustain-hero .sustain-text h2 {
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: 24px;
}

.sustain-hero .sustain-text p {
    color: var(--color-text-light);
    margin-bottom: 20px;
    line-height: 1.9;
}

.sustain-hero .sustain-visual {
    aspect-ratio: 4/3;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, rgba(26, 77, 51, 0.7) 0%, rgba(45, 125, 82, 0.6) 100%),
                url('../images/sustainability.jpg') center/cover no-repeat;
    position: relative;
    overflow: hidden;
}

.sustain-hero .sustain-visual::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 50% 50%, rgba(200, 146, 60, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 40%);
}

.sustain-pillars {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.pillar-card {
    padding: 40px 30px;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    text-align: center;
    transition: all var(--transition);
}

.pillar-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.pillar-card .pillar-num {
    font-size: 3rem;
    font-weight: 800;
    color: var(--color-accent);
    opacity: 0.3;
    line-height: 1;
    margin-bottom: 16px;
}

.pillar-card h3 {
    font-size: 1.2rem;
    color: var(--color-primary);
    margin-bottom: 12px;
}

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

@media (max-width: 768px) {
    .sustain-hero {
        grid-template-columns: 1fr;
    }
    .sustain-pillars {
        grid-template-columns: 1fr;
    }
}

/* ---------- News Page ---------- */
.news-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

.news-item {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 30px;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.news-item:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

.news-item .news-thumb {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    position: relative;
    min-height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.news-item .news-thumb::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 50%, rgba(200, 146, 60, 0.2) 0%, transparent 50%);
}

.news-item .news-thumb .thumb-date {
    position: relative;
    z-index: 2;
    color: var(--color-white);
    text-align: center;
}

.news-item .news-thumb .thumb-date .day {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1;
}

.news-item .news-thumb .thumb-date .month {
    font-size: 0.8rem;
    opacity: 0.7;
    margin-top: 4px;
}

.news-item .news-info {
    padding: 24px 30px 24px 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.news-item .news-info .category {
    font-size: 0.75rem;
    color: var(--color-accent);
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 10px;
}

.news-item .news-info h3 {
    font-size: 1.2rem;
    color: var(--color-primary);
    margin-bottom: 12px;
    line-height: 1.4;
}

.news-item .news-info p {
    font-size: 0.88rem;
    color: var(--color-text-light);
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

@media (max-width: 768px) {
    .news-item {
        grid-template-columns: 1fr;
    }
    .news-item .news-info {
        padding: 24px;
    }
}

/* ---------- Contact Page ---------- */
.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
}

.contact-info .info-item {
    display: flex;
    gap: 20px;
    margin-bottom: 36px;
}

.contact-info .info-item .icon {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    background: var(--color-bg-alt);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: var(--color-accent);
}

.contact-info .info-item .content h4 {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 6px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.contact-info .info-item .content p {
    font-size: 1rem;
    color: var(--color-text);
    font-weight: 500;
}

.contact-info .info-item .content a {
    color: var(--color-text);
    transition: color var(--transition);
}

.contact-info .info-item .content a:hover {
    color: var(--color-accent);
}

/* Contact form */
.contact-form {
    background: var(--color-white);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
}

.contact-form h3 {
    font-size: 1.4rem;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.contact-form .form-subtitle {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--color-text);
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group label .required {
    color: #e74c3c;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg-alt);
    transition: all var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    background: var(--color-white);
    box-shadow: 0 0 0 3px rgba(200, 146, 60, 0.1);
}

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

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

.form-submit {
    width: 100%;
    padding: 14px;
    background: var(--color-primary);
    color: var(--color-white);
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
}

.form-submit:hover {
    background: var(--color-accent);
}

.form-success {
    display: none;
    padding: 16px;
    background: #e8f5e9;
    border: 1px solid #a5d6a7;
    border-radius: var(--radius);
    color: #2e7d32;
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.form-success.show {
    display: block;
}

.form-error {
    display: none;
    padding: 16px;
    background: #fff3e0;
    border: 1px solid #ffcc80;
    border-radius: var(--radius);
    color: #e65100;
    font-size: 0.9rem;
    margin-bottom: 20px;
    line-height: 1.6;
}

.form-error.show {
    display: block;
}

.form-submit {
    transition: opacity 0.3s;
}

@media (max-width: 768px) {
    .contact-layout {
        grid-template-columns: 1fr;
    }
    .form-row {
        grid-template-columns: 1fr;
    }
    .contact-form {
        padding: 24px;
    }
}

/* ---------- Footer ---------- */
.site-footer {
    background: var(--color-primary-dark);
    color: rgba(255, 255, 255, 0.7);
    padding: 60px 0 0;
}

.footer-main {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .logo {
    color: var(--color-white);
    margin-bottom: 20px;
}

.footer-brand .logo .logo-mark {
    background: var(--color-accent);
    color: var(--color-white);
}

.footer-brand p {
    font-size: 0.85rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.5);
    max-width: 300px;
}

.footer-col h4 {
    font-size: 0.85rem;
    color: var(--color-white);
    margin-bottom: 20px;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col ul li a {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.5);
    transition: color var(--transition);
}

.footer-col ul li a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    padding: 20px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.4);
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.4);
}

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

@media (max-width: 768px) {
    .footer-main {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    .footer-bottom {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
}

/* ---------- Back to top ---------- */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    z-index: 999;
    border: none;
    font-size: 1.2rem;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--color-accent);
    transform: translateY(-3px);
}

/* ---------- Animations ---------- */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ---------- Brand tag (KHAOS) ---------- */
.brand-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--color-accent);
    color: var(--color-white);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 2px;
    border-radius: var(--radius);
    text-transform: uppercase;
}