/* ========================================
   Cheapurchase - Main Stylesheet
   Black/Grey Minimalist + Red Accent
   ======================================== */

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

:root {
    --color-black: #1a1a1a;
    --color-dark: #2d2d2d;
    --color-grey-900: #333333;
    --color-grey-700: #555555;
    --color-grey-500: #777777;
    --color-grey-300: #aaaaaa;
    --color-grey-100: #e0e0e0;
    --color-grey-50: #f5f5f5;
    --color-white: #ffffff;
    --color-red: #d32f2f;
    --color-red-dark: #b71c1c;
    --color-red-light: #ffebee;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.16);
    --radius: 8px;
    --radius-lg: 12px;
    --transition: all 0.3s ease;
    --container: 1200px;
}

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-grey-900);
    background: var(--color-white);
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font: inherit; }

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 15px;
    transition: var(--transition);
    text-align: center;
    gap: 8px;
}
.btn-primary { background: var(--color-red); color: var(--color-white); }
.btn-primary:hover { background: var(--color-red-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-outline { background: transparent; color: var(--color-white); border: 2px solid var(--color-white); }
.btn-outline:hover { background: var(--color-white); color: var(--color-black); }
.btn-block { width: 100%; }
.btn-sm { padding: 8px 16px; font-size: 13px; }

/* --- Navbar --- */
.navbar {
    position: fixed; top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(26,26,26,0.95);
    backdrop-filter: blur(10px);
    transition: var(--transition);
    padding: 16px 0;
}
.nav-container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
    display: flex; align-items: center; justify-content: space-between;
}
.nav-logo .logo-text { font-size: 24px; font-weight: 800; color: var(--color-white); letter-spacing: -0.5px; }
.nav-logo .logo-text::after { content: '.'; color: var(--color-red); }
.nav-menu { display: flex; gap: 8px; }
.nav-link {
    color: rgba(255,255,255,0.8);
    padding: 8px 16px;
    border-radius: var(--radius);
    font-size: 14px; font-weight: 500;
    transition: var(--transition);
}
.nav-link:hover, .nav-link.active { color: var(--color-white); background: rgba(255,255,255,0.1); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--color-white); transition: var(--transition); }

/* --- HERO: solid #333 bg, centered layout per design reference --- */
.hero {
    min-height: 100vh;
    display: flex; align-items: center; justify-content: center;
    background: #333333;
    color: var(--color-white);
    position: relative; overflow: hidden;
}
/* Optional background image overlay (set via JS from settings) */
.hero-bg-image {
    position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    background-size: cover; background-position: center;
    opacity: 0.25; z-index: 0;
    pointer-events: none; /* 背景图不拦截任何鼠标事件 */
}
.hero-bg-image::after {
    content: ''; position: absolute; inset: 0;
    background: rgba(51,51,51,0.6);
    pointer-events: none;
}
.hero-container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 120px 24px 80px;
    position: relative; z-index: 10;
    width: 100%;
    pointer-events: none; /* 容器不拦截，让子元素自己处理 */
}
.hero-container .hero-content,
.hero-container .hero-content * {
    pointer-events: auto; /* 内容区域全部可交互 */
}
.hero-content {
    display: flex; flex-direction: column; align-items: left; text-align: left;
    max-width: 1080px; margin: 0 auto;
}
.hero-title {
    font-size: clamp(26px, 3vw, 45px);
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 16px;
    letter-spacing: -0.3px;
    color: var(--color-white);
}
.hero-subtext {
    font-size: clamp(24px, 3vw, 40px);
    color: var(--color-red);
    margin-bottom: 36px;
    line-height: 1.5;
    font-weight: 500;
}
.hero-actions {
    display: flex; flex-direction: row; gap: 16px; align-items: left; justify-content: left;
    flex-wrap: wrap;
}
.hero-actions .btn { min-width: 180px; padding: 14px 32px; font-size: 18px; }
.hero-actions .btn-primary { background: var(--color-red); color: var(--color-white); border: none; }
.hero-actions .btn-primary:hover { background: var(--color-red-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.hero-actions .btn-outline { background: transparent; color: var(--color-white); border: 2px solid var(--color-grey-500); }
.hero-actions .btn-outline:hover { background: rgba(255,255,255,0.1); color: var(--color-white); border-color: var(--color-white); }
.hero-scroll { position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%); z-index: 1; }
.hero-scroll span {
    display: block; width: 30px; height: 50px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 15px; position: relative;
}
.hero-scroll span::after {
    content: ''; position: absolute;
    top: 8px; left: 50%; transform: translateX(-50%);
    width: 4px; height: 8px;
    background: var(--color-red); border-radius: 2px;
    animation: scrollDot 2s infinite;
}
@keyframes scrollDot { 0%,100% { top: 8px; opacity: 1; } 50% { top: 24px; opacity: 0.3; } }

/* Logo in navbar */
.nav-logo-img { height: 36px; width: auto; display: block; }
.nav-logo { display: flex; align-items: center; gap: 8px; }

/* --- Sections --- */
.section { padding: 100px 0; }
.section-header { text-align: center; margin-bottom: 64px; }
.section-title { font-size: clamp(28px, 4vw, 40px); font-weight: 800; color: var(--color-black); margin-bottom: 12px; letter-spacing: -0.5px; }
.section-desc { font-size: 17px; color: var(--color-grey-500); max-width: 600px; margin: 0 auto; }

/* --- Services --- */
.services-section { background: var(--color-grey-50); }
.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.service-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative; overflow: hidden;
}
.service-card::before {
    content: ''; position: absolute;
    top: 0; left: 0; right: 0; height: 4px;
    background: var(--color-red);
    transform: scaleX(0); transform-origin: left;
    transition: var(--transition);
}
.service-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.service-card:hover::before { transform: scaleX(1); }
.service-icon { width: 56px; height: 56px; border-radius: var(--radius); background: var(--color-red-light); display: flex; align-items: center; justify-content: center; font-size: 24px; margin-bottom: 24px; }
.service-card h3 { font-size: 20px; font-weight: 700; color: var(--color-black); margin-bottom: 16px; }
.service-card .pain-points { margin-bottom: 20px; }
.service-card .pain-points h4 { font-size: 13px; text-transform: uppercase; color: var(--color-red); margin-bottom: 8px; font-weight: 700; letter-spacing: 0.5px; }
.service-card .pain-points ul { list-style: none; padding: 0; }
.service-card .pain-points li { font-size: 14px; color: var(--color-grey-700); padding: 4px 0 4px 20px; position: relative; }
.service-card .pain-points li::before { content: '⚠'; position: absolute; left: 0; font-size: 12px; }
.service-card .solutions h4 { font-size: 13px; text-transform: uppercase; color: #2e7d32; margin-bottom: 8px; font-weight: 700; letter-spacing: 0.5px; }
.service-card .solutions ul { list-style: none; padding: 0; }
.service-card .solutions li { font-size: 14px; color: var(--color-grey-700); padding: 4px 0 4px 20px; position: relative; }
.service-card .solutions li::before { content: '✓'; position: absolute; left: 0; color: #2e7d32; font-weight: 700; }

/* --- Advantages --- */
.advantages-section { background: var(--color-black); color: var(--color-white); }
.advantages-section .section-title { color: var(--color-white); }
.advantages-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 32px; }
.advantage-card { text-align: center; padding: 40px 24px; border: 1px solid rgba(255,255,255,0.1); border-radius: var(--radius-lg); transition: var(--transition); }
.advantage-card:hover { border-color: var(--color-red); background: rgba(211,47,47,0.05); }
.advantage-icon { font-size: 40px; margin-bottom: 20px; }
.advantage-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 12px; color: var(--color-white); }
.advantage-card p { font-size: 14px; color: rgba(255,255,255,0.7); line-height: 1.6; }

/* --- Products --- */
.products-section { background: var(--color-white); }
.products-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; }
.product-card {
    background: var(--color-grey-50);
    border: 1px solid var(--color-grey-100);
    border-radius: var(--radius-lg);
    padding: 0;
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
    display: block;
    color: inherit;
}
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--color-red); }
.product-image {
    width: 100%; height: 160px;
    background: linear-gradient(135deg, var(--color-grey-300), var(--color-grey-100));
    display: flex; align-items: center; justify-content: center;
    overflow: hidden;
}
.product-image img { width: 100%; height: 100%; object-fit: cover; }
.product-icon-large { font-size: 48px; }
.product-card h3 { font-size: 16px; font-weight: 700; padding: 16px 20px 4px; color: var(--color-black); }
.product-summary { font-size: 13px; color: var(--color-grey-500); padding: 0 20px 20px; line-height: 1.5; }

/* --- Carousel (shared) --- */
.carousel-wrapper {
    position: relative;
    display: flex; align-items: center;
    gap: 16px;
}
.carousel {
    overflow: hidden;
    flex: 1;
}
.carousel-track {
    display: flex;
    gap: 24px;
    transition: transform 0.5s ease;
}
.carousel-arrow {
    width: 48px; height: 48px;
    border-radius: 50%;
    background: var(--color-white);
    color: var(--color-grey-700);
    font-size: 20px;
    display: flex; align-items: center; justify-content: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    flex-shrink: 0;
    z-index: 10;
}
.carousel-arrow:hover { background: var(--color-red); color: var(--color-white); }
.carousel-dots { display: flex; justify-content: center; gap: 8px; margin-top: 32px; }
.carousel-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--color-grey-300); cursor: pointer; transition: var(--transition); }
.carousel-dot.active { background: var(--color-red); transform: scale(1.2); }

/* --- Cases Carousel --- */
.cases-section { background: var(--color-grey-50); }
.cases-carousel-wrapper { position: relative; display: flex; align-items: center; gap: 16px; }
.cases-carousel { overflow: hidden; flex: 1; }
.cases-track { display: flex; gap: 24px; transition: transform 0.5s ease; }
.case-card {
    flex: 0 0 calc((100% - 48px) / 3);
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    cursor: pointer;
}
.case-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.case-image { width: 100%; height: 200px; background: var(--color-grey-100); display: flex; align-items: center; justify-content: center; font-size: 48px; overflow: hidden; }
.case-image img { width: 100%; height: 100%; object-fit: cover; }
.case-content { padding: 24px; }
.case-meta { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.case-avatar { width: 40px; height: 40px; border-radius: 50%; object-fit: cover; border: 2px solid var(--color-red); }
.case-avatar-fallback { width: 40px; height: 40px; border-radius: 50%; background: var(--color-grey-100); display: flex; align-items: center; justify-content: center; font-size: 20px; }
.case-client { font-size: 14px; font-weight: 600; color: var(--color-black); }
.case-date { font-size: 12px; color: var(--color-grey-500); }
.case-category { font-size: 12px; text-transform: uppercase; color: var(--color-red); font-weight: 700; letter-spacing: 0.5px; margin-bottom: 8px; }
.case-card h3 { font-size: 18px; font-weight: 700; color: var(--color-black); margin-bottom: 8px; }
.case-product { font-size: 13px; color: var(--color-grey-500); margin-bottom: 8px; }
.case-testimonial { font-size: 13px; color: var(--color-grey-700); line-height: 1.5; font-style: italic; }

/* --- Blog Carousel (cover image as background) --- */
.blog-section { background: var(--color-white); }
.blog-carousel-wrapper { position: relative; display: flex; align-items: center; gap: 16px; }
.blog-carousel { overflow: hidden; flex: 1; }
.blog-track { display: flex; gap: 24px; transition: transform 0.5s ease; }
.blog-card-bg {
    flex: 0 0 calc((100% - 48px) / 3);
    height: 320px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
    cursor: pointer;
    background-size: cover;
    background-position: center;
    background-color: var(--color-grey-300);
    display: flex; align-items: flex-end;
    transition: var(--transition);
}
.blog-card-bg:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.blog-overlay {
    background: linear-gradient(to top, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0.3) 70%, transparent 100%);
    padding: 32px 24px 24px;
    color: var(--color-white);
    width: 100%;
}
.blog-overlay .blog-date { font-size: 12px; color: rgba(255,255,255,0.7); margin-bottom: 8px; }
.blog-overlay h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; line-height: 1.3; }
.blog-overlay p { font-size: 13px; color: rgba(255,255,255,0.8); line-height: 1.5; }

/* --- Quotation / Pricing --- */
.quotation-section { background: var(--color-grey-50); }
.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; margin-bottom: 48px; align-items: stretch; }
.pricing-card { background: var(--color-white); border-radius: var(--radius-lg); padding: 40px 32px; text-align: center; box-shadow: var(--shadow-sm); transition: var(--transition); position: relative; display: flex; flex-direction: column; justify-content: space-between; border: 1px solid var(--color-grey-100); }
.pricing-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.pricing-card h3 { font-size: 20px; color: var(--color-grey-700); margin-bottom: 16px; }
.pricing-price { font-size: 48px; font-weight: 800; color: var(--color-red); margin-bottom: 24px; }
.pricing-price span { font-size: 16px; font-weight: 400; color: var(--color-grey-500); }
.pricing-features { list-style: none; padding: 0; text-align: left; }
.pricing-features li { padding: 8px 0; font-size: 14px; color: var(--color-grey-700); border-bottom: 1px solid var(--color-grey-100); }
.pricing-features li:last-child { border: none; }
.pricing-features li::before { content: '✓ '; color: var(--color-red); font-weight: 700; }
.promo-box { background: var(--color-red-light); border-left: 4px solid var(--color-red); border-radius: var(--radius); padding: 24px 32px; display: flex; align-items: flex-start; gap: 16px; }
.promo-icon { font-size: 28px; }
.promo-text { font-size: 15px; color: var(--color-grey-900); line-height: 1.6; }

/* --- Contact --- */
.contact-section { background: var(--color-black); color: var(--color-white); }
.contact-section .section-title { color: var(--color-white); }
.contact-section .section-desc { color: rgba(255,255,255,0.6); }
.contact-layout { display: grid; grid-template-columns: 1fr 1.5fr; gap: 64px; align-items: start; }
.contact-info { display: flex; flex-direction: column; gap: 32px; }
.contact-item { display: flex; gap: 16px; align-items: flex-start; }
.contact-icon { width: 48px; height: 48px; border-radius: var(--radius); background: rgba(211,47,47,0.2); display: flex; align-items: center; justify-content: center; font-size: 20px; flex-shrink: 0; }
.contact-item h4 { font-size: 14px; text-transform: uppercase; color: var(--color-grey-300); margin-bottom: 4px; letter-spacing: 0.5px; }
.contact-item p, .contact-item a { font-size: 16px; color: var(--color-white); }
.contact-item a:hover { color: var(--color-red); }

/* --- Form --- */
.contact-form { background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1); border-radius: var(--radius-lg); padding: 40px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; color: rgba(255,255,255,0.8); margin-bottom: 8px; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%; padding: 12px 16px;
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: var(--radius);
    background: rgba(255,255,255,0.05);
    color: var(--color-white); font-size: 15px;
    transition: var(--transition); font-family: inherit;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--color-red); background: rgba(255,255,255,0.1); }
.form-group input::placeholder, .form-group textarea::placeholder { color: rgba(255,255,255,0.4); }
.form-group select option { background: var(--color-dark); color: var(--color-white); }
.form-message { margin-top: 16px; padding: 12px 16px; border-radius: var(--radius); font-size: 14px; display: none; }
.form-message.success { display: block; background: rgba(46,125,50,0.2); color: #81c784; border: 1px solid rgba(46,125,50,0.3); }
.form-message.error { display: block; background: rgba(211,47,47,0.2); color: #ef9a9a; border: 1px solid rgba(211,47,47,0.3); }

/* --- Footer --- */
.footer { background: #111; color: rgba(255,255,255,0.6); padding: 60px 0 24px; }
.footer-content { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px; margin-bottom: 40px; }
.footer-brand h3 { font-size: 24px; color: var(--color-white); margin-bottom: 8px; }
.footer-brand p { font-size: 14px; margin-bottom: 8px; }
.footer-contact { font-size: 14px !important; }
.footer-links h4 { font-size: 14px; text-transform: uppercase; color: var(--color-white); margin-bottom: 16px; letter-spacing: 0.5px; }
.footer-links a { display: block; font-size: 14px; color: rgba(255,255,255,0.6); padding: 4px 0; transition: var(--transition); }
.footer-links a:hover { color: var(--color-red); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 24px; text-align: center; font-size: 13px; }

/* --- Product Detail Page --- */
.product-detail-section { padding: 140px 0 100px; }
.product-detail-container { max-width: 900px; margin: 0 auto; padding: 0 24px; }
.product-detail-image { width: 100%; height: 400px; border-radius: var(--radius-lg); overflow: hidden; margin-bottom: 40px; background: var(--color-grey-100); display: flex; align-items: center; justify-content: center; font-size: 64px; }
.product-detail-image img { width: 100%; height: 100%; object-fit: cover; }
.product-detail-content h1 { font-size: 36px; font-weight: 800; color: var(--color-black); margin-bottom: 24px; }
.product-detail-content .product-body { font-size: 16px; color: var(--color-grey-700); line-height: 1.8; }
.product-detail-content .product-body p { margin-bottom: 16px; }
.product-detail-content .product-body img { max-width: 100%; border-radius: var(--radius); margin: 16px 0; }
.back-link { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; color: var(--color-red); margin-bottom: 32px; font-weight: 600; }
.back-link:hover { color: var(--color-red-dark); }

/* --- Case Detail Page --- */
.case-detail-section { padding: 140px 0 100px; }
.case-detail-container { max-width: 900px; margin: 0 auto; padding: 0 24px; }
.case-detail-header { display: flex; align-items: center; gap: 20px; margin-bottom: 32px; }
.case-detail-header img.avatar { width: 64px; height: 64px; border-radius: 50%; object-fit: cover; border: 3px solid var(--color-red); }
.case-detail-meta h2 { font-size: 14px; color: var(--color-grey-500); font-weight: 400; }
.case-detail-meta .name { font-size: 18px; font-weight: 700; color: var(--color-black); }
.case-detail-content h1 { font-size: 32px; font-weight: 800; color: var(--color-black); margin-bottom: 16px; }
.case-detail-content .testimonial-box { background: var(--color-red-light); border-left: 4px solid var(--color-red); padding: 24px; border-radius: var(--radius); margin: 24px 0; font-style: italic; font-size: 16px; color: var(--color-grey-900); }
.case-detail-content .body { font-size: 16px; color: var(--color-grey-700); line-height: 1.8; }
.case-detail-images { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 16px; margin: 24px 0; }
.case-detail-images img { width: 100%; border-radius: var(--radius); }

/* --- Blog Detail Page --- */
.blog-detail-section { padding: 140px 0 100px; }
.blog-detail-container { max-width: 800px; margin: 0 auto; padding: 0 24px; }
.blog-detail-cover { width: 100%; height: 360px; border-radius: var(--radius-lg); overflow: hidden; margin-bottom: 40px; background: var(--color-grey-100); }
.blog-detail-cover img { width: 100%; height: 100%; object-fit: cover; }
.blog-detail-content h1 { font-size: 36px; font-weight: 800; color: var(--color-black); margin-bottom: 16px; line-height: 1.2; }
.blog-detail-content .meta { font-size: 14px; color: var(--color-grey-500); margin-bottom: 32px; }
.blog-detail-content .body { font-size: 16px; color: var(--color-grey-700); line-height: 1.8; }
.blog-detail-content .body p { margin-bottom: 16px; }
.blog-detail-content .body img { max-width: 100%; border-radius: var(--radius); margin: 16px 0; }
.blog-detail-content .body h2 { font-size: 24px; font-weight: 700; color: var(--color-black); margin: 32px 0 16px; }
.blog-detail-content .body h3 { font-size: 20px; font-weight: 700; color: var(--color-black); margin: 24px 0 12px; }
.blog-detail-content .body ul, .blog-detail-content .body ol { padding-left: 24px; margin-bottom: 16px; }
.blog-detail-content .body li { margin-bottom: 8px; }

/* --- Responsive --- */
@media (max-width: 900px) {
    .hero-container { padding: 100px 24px 60px; }
    .hero-title { font-size: clamp(22px, 6vw, 32px); }
    .hero-actions { flex-direction: column; width: 100%; max-width: 320px; }
    .hero-actions .btn { width: 100%; }
    .case-card, .blog-card-bg { flex: 0 0 calc((100% - 24px) / 2); }
    .contact-layout { grid-template-columns: 1fr; }
    .footer-content { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
    .nav-menu { display: none; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: var(--color-black); padding: 16px; }
    .nav-menu.active { display: flex; }
    .nav-toggle { display: flex; }
    .case-card, .blog-card-bg { flex: 0 0 100%; }
    .section { padding: 60px 0; }
    .carousel-arrow { display: none; }
}