/* =============================================
   速德 SUDE — 水泥修补料专业供应商
   设计版本 v2 — 现代工业风 (2026-07)
   ============================================= */

/* ---------- 字体 ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=Noto+Sans+SC:wght@400;500;700;900&display=swap');

:root {
    /* 主色系 — 深蓝灰 + 橙色 */
    --primary: #0f172a;
    --primary-light: #1e293b;
    --primary-mid: #334155;
    --accent: #f97316;
    --accent-light: #fb923c;
    --accent-dark: #ea580c;

    /* 中性色 */
    --text: #1e293b;
    --text-light: #64748b;
    --text-muted: #94a3b8;
    --bg: #ffffff;
    --bg-alt: #f8fafc;
    --bg-card: #ffffff;
    --border: #e2e8f0;

    /* 阴影系统 */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);

    /* 圆角 */
    --radius-sm: 6px;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* 过渡 */
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);

    /* 容器 */
    --container: 1200px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text);
    line-height: 1.7;
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}
::selection { background: var(--accent); color: #fff; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

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

/* ========== SCROLL ANIMATIONS ========== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ========== TOP BAR ========== */
.top-bar {
    background: var(--primary);
    color: rgba(255,255,255,0.7);
    font-size: 13px;
    padding: 6px 0;
    letter-spacing: 0.3px;
}
.top-bar .container {
    display: flex;
    justify-content: flex-end;
    gap: 28px;
}
.top-bar i {
    margin-right: 6px;
    color: var(--accent);
}

/* ========== HEADER / NAV ========== */
.header {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 74px;
}

/* Logo */
.logo {
    display: flex;
    flex-direction: column;
    line-height: 1.15;
    position: relative;
}
.logo-text {
    font-size: 26px;
    font-weight: 900;
    color: var(--primary);
    letter-spacing: -0.5px;
}
.logo-text small {
    font-size: 18px;
    font-weight: 400;
    color: var(--accent);
    margin-left: 3px;
}
.logo-tagline {
    font-size: 10.5px;
    color: var(--text-muted);
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-top: 1px;
}

/* Nav */
.nav {
    display: flex;
    gap: 4px;
}
.nav a {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-light);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}
.nav a:hover {
    color: var(--primary);
    background: var(--bg-alt);
}
.nav a.active {
    color: var(--accent);
    background: rgba(249, 115, 22, 0.08);
    font-weight: 600;
}

.btn-whatsapp-nav {
    background: linear-gradient(135deg, #25D366, #1da851);
    color: #fff !important;
    padding: 10px 22px;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
    white-space: nowrap;
    box-shadow: 0 2px 8px rgba(37,211,102,0.25);
}
.btn-whatsapp-nav:hover {
    transform: translateY(-1px) scale(1.02);
    box-shadow: 0 4px 16px rgba(37,211,102,0.35);
}

.hamburger {
    display: none;
    font-size: 26px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--primary);
    padding: 6px;
    transition: var(--transition);
}

/* ========== HERO ========== */
.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    background: linear-gradient(160deg, #0f172a 0%, #1e293b 40%, #0f172a 100%);
    overflow: hidden;
}
/* 几何装饰 */
.hero::before {
    content: '';
    position: absolute;
    width: 700px;
    height: 700px;
    border: 1px solid rgba(249, 115, 22, 0.06);
    border-radius: 50%;
    top: -250px;
    right: -200px;
    pointer-events: none;
}
.hero::after {
    content: '';
    position: absolute;
    width: 450px;
    height: 450px;
    border: 1px solid rgba(249, 115, 22, 0.04);
    border-radius: 50%;
    bottom: -150px;
    left: -100px;
    pointer-events: none;
}
.hero-grid-bg {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(249,115,22,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(249,115,22,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    color: #fff;
    max-width: 780px;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 14px;
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    background: rgba(249, 115, 22, 0.15);
    color: var(--accent-light);
    border: 1px solid rgba(249, 115, 22, 0.2);
    margin-bottom: 24px;
}
.hero h1 {
    font-size: 56px;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 16px;
    letter-spacing: -1px;
}
.hero h1 span {
    display: block;
    font-size: 32px;
    font-weight: 500;
    color: var(--accent);
    margin-top: 8px;
    letter-spacing: 0;
}
.hero h1 .highlight {
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero p {
    font-size: 17px;
    line-height: 1.8;
    color: rgba(255,255,255,0.65);
    margin-bottom: 36px;
    max-width: 600px;
}
.hero-btns {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

/* ========== BUTTONS ========== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 30px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
}
.btn i { font-size: 14px; transition: transform 0.25s ease; }
.btn:hover i { transform: translateX(3px); }

.btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    color: #fff;
    box-shadow: 0 4px 14px rgba(249,115,22,0.3);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(249,115,22,0.4);
}

.btn-whatsapp {
    background: linear-gradient(135deg, #25D366, #1da851);
    color: #fff;
    box-shadow: 0 4px 14px rgba(37,211,102,0.3);
}
.btn-whatsapp:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(37,211,102,0.4);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}
.btn-outline:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
}

.btn-lg {
    padding: 16px 38px;
    font-size: 16px;
}

.btn-text {
    color: var(--accent);
    font-weight: 600;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}
.btn-text:hover {
    gap: 10px;
    color: var(--accent-dark);
}

/* ========== SECTIONS ========== */
.section {
    padding: 96px 0;
}
.section-title {
    font-size: 34px;
    font-weight: 800;
    text-align: center;
    color: var(--primary);
    margin-bottom: 10px;
    letter-spacing: -0.5px;
}
.section-subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 16px;
    max-width: 560px;
    margin: 0 auto 52px;
    line-height: 1.7;
}

/* ========== FEATURES ========== */
.features {
    background: var(--bg-alt);
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.feature-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 40px 28px;
    text-align: center;
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    transform: scaleX(0);
    transition: transform 0.4s ease;
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(249,115,22,0.15);
}
.feature-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(249,115,22,0.1), rgba(249,115,22,0.05));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 18px;
    font-size: 26px;
    color: var(--accent);
    transition: var(--bounce);
}
.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(-3deg);
}
.feature-card h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--primary);
}
.feature-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
}

/* ========== PRODUCTS PREVIEW ========== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.product-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: var(--transition);
}
.product-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(249,115,22,0.1);
}
.product-img {
    height: 220px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
    position: relative;
    overflow: hidden;
}
.product-img i {
    transition: var(--bounce);
}
.product-card:hover .product-img i {
    transform: scale(1.1);
}

.product-card h3 {
    padding: 20px 22px 4px;
    font-size: 17px;
    font-weight: 700;
    color: var(--primary);
}
.product-spec {
    padding: 0 22px;
    font-size: 13px;
    color: var(--accent);
    font-weight: 600;
}
.product-desc {
    padding: 8px 22px 16px;
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
}
.product-card .btn-text {
    margin: 0 22px 22px;
}

/* ========== APPLICATIONS ========== */
.applications {
    background: var(--primary);
    position: relative;
    overflow: hidden;
}
.applications::before {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(249,115,22,0.05) 0%, transparent 70%);
    top: -100px;
    right: -100px;
}
.applications .section-title { color: #fff; }
.applications .section-subtitle { color: rgba(255,255,255,0.5); }

.app-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 16px;
    position: relative;
    z-index: 1;
}
.app-item {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius);
    padding: 32px 16px;
    text-align: center;
    transition: var(--transition);
    cursor: default;
    backdrop-filter: blur(4px);
}
.app-item:hover {
    background: rgba(255,255,255,0.12);
    transform: translateY(-4px);
    border-color: rgba(249,115,22,0.3);
}
.app-item i {
    font-size: 34px;
    color: var(--accent);
    display: block;
    margin-bottom: 10px;
}
.app-item span {
    font-size: 14px;
    font-weight: 500;
}

/* ========== VIDEO SHOWCASE ========== */
.video-showcase {
    background: var(--bg-alt);
}
.social-links {
    display: flex;
    justify-content: center;
    gap: 14px;
    margin-bottom: 36px;
}
.social-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
    color: #fff;
    transition: var(--transition);
}
.social-btn.tiktok {
    background: #000;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}
.social-btn.facebook {
    background: #1877F2;
    box-shadow: 0 2px 8px rgba(24,119,242,0.25);
}
.social-btn.youtube {
    background: #FF0000;
    box-shadow: 0 2px 8px rgba(255,0,0,0.2);
}
.social-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.2);
}
.video-placeholder {
    max-width: 680px;
    margin: 0 auto;
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 64px 40px;
    text-align: center;
    border: 2px dashed var(--border);
    transition: var(--transition);
}
.video-placeholder:hover {
    border-color: var(--accent);
    background: rgba(249,115,22,0.02);
}
.video-placeholder i {
    font-size: 64px;
    color: var(--accent);
    margin-bottom: 14px;
    transition: var(--bounce);
}
.video-placeholder:hover i {
    transform: scale(1.1);
}
.video-placeholder p {
    color: var(--text-light);
    font-size: 15px;
}

/* ========== CTA ========== */
.cta-section {
    background: linear-gradient(160deg, #0f172a 0%, #1e293b 100%);
    color: #fff;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.cta-section::before {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(249,115,22,0.05) 0%, transparent 70%);
    bottom: -200px;
    left: -100px;
}
.cta-section h2 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 14px;
    letter-spacing: -0.5px;
    position: relative;
    z-index: 1;
}
.cta-section p {
    font-size: 17px;
    color: rgba(255,255,255,0.6);
    margin-bottom: 32px;
    line-height: 1.8;
    position: relative;
    z-index: 1;
}
.cta-btns {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

/* ========== FOOTER ========== */
.footer {
    background: var(--primary);
    color: rgba(255,255,255,0.7);
    padding: 64px 0 0;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
    gap: 40px;
}
.footer-col h4 {
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}
.footer-col h4::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 24px;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
}
.footer-col p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 8px;
}
.footer-col a {
    display: block;
    font-size: 14px;
    color: rgba(255,255,255,0.55);
    margin-bottom: 10px;
    transition: var(--transition);
}
.footer-col a:hover {
    color: var(--accent);
    padding-left: 4px;
}
.footer-contact p i {
    width: 20px;
    color: var(--accent);
    margin-right: 6px;
}
.footer-social {
    display: flex;
    gap: 10px;
    margin-top: 14px;
}
.footer-social a {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255,255,255,0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    margin-bottom: 0 !important;
    transition: var(--transition);
}
.footer-social a:hover {
    background: var(--accent);
    color: #fff !important;
    padding-left: 0 !important;
    transform: translateY(-2px);
}
.footer-bottom {
    margin-top: 48px;
    padding: 20px 0;
    border-top: 1px solid rgba(255,255,255,0.06);
    text-align: center;
    font-size: 13px;
    color: rgba(255,255,255,0.3);
}

/* ========== FLOATING WHATSAPP ========== */
.float-whatsapp {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, #25D366, #1da851);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    box-shadow: 0 4px 16px rgba(37,211,102,0.4);
    z-index: 999;
    transition: var(--transition);
}
.float-whatsapp:hover {
    transform: scale(1.1);
    color: #fff;
    box-shadow: 0 6px 24px rgba(37,211,102,0.5);
}
.float-whatsapp-label {
    display: none;
}

/* ========== PAGE BANNER (子页面) ========== */
.page-banner {
    padding: 64px 0;
    text-align: center;
    color: #fff;
    background: linear-gradient(160deg, #0f172a, #1e293b);
    position: relative;
    overflow: hidden;
}
.page-banner::before {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(249,115,22,0.06) 0%, transparent);
    top: -80px;
    right: -80px;
}
.page-banner h1 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
    position: relative;
    z-index: 1;
}
.page-banner p {
    color: rgba(255,255,255,0.5);
    font-size: 16px;
    position: relative;
    z-index: 1;
}

/* ========== PRODUCT DETAIL ========== */
.product-detail-card {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 40px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 40px;
    border: 1px solid var(--border);
    margin-bottom: 32px;
    transition: var(--transition);
}
.product-detail-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: rgba(249,115,22,0.1);
}
.pd-img {
    height: 280px;
    background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
}
.pd-info h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 12px;
}
.pd-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}
.tag {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    background: var(--bg-alt);
    color: var(--text-light);
    border: 1px solid var(--border);
}
.tag-accent {
    background: rgba(249,115,22,0.08);
    color: var(--accent);
    border-color: rgba(249,115,22,0.15);
}
.pd-info p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 16px;
}
.pd-features {
    list-style: none;
    margin-bottom: 20px;
}
.pd-features li {
    font-size: 14px;
    color: var(--text);
    padding: 5px 0;
    display: flex;
    align-items: center;
    gap: 8px;
}
.pd-features li i {
    color: #22c55e;
    font-size: 13px;
}
.pd-table {
    width: 100%;
    max-width: 500px;
    border-collapse: collapse;
    margin-bottom: 20px;
}
.pd-table td {
    padding: 8px 12px;
    font-size: 14px;
    border-bottom: 1px solid var(--border);
}
.pd-table td:first-child {
    font-weight: 600;
    color: var(--text);
    width: 120px;
}
.pd-table td:last-child {
    color: var(--text-light);
}

/* ========== ABOUT ========== */
.about-intro {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
    margin-bottom: 60px;
}
.about-intro-text h2 {
    font-size: 28px;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}
.about-intro-text p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 12px;
}
.about-image {
    height: 360px;
    background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 64px;
}
.stat-card {
    text-align: center;
    padding: 32px 16px;
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: var(--transition);
}
.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}
.stat-card .number {
    font-size: 38px;
    font-weight: 900;
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-card .label {
    font-size: 14px;
    color: var(--text-light);
    margin-top: 6px;
    font-weight: 500;
}
.about-values {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.value-card {
    text-align: center;
    padding: 36px 24px;
    background: var(--bg-alt);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: var(--transition);
}
.value-card:hover { box-shadow: var(--shadow-md); }
.value-card i {
    font-size: 34px;
    color: var(--accent);
    margin-bottom: 12px;
}
.value-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}
.value-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
}

/* ========== CASES ========== */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}
.case-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: var(--transition);
}
.case-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}
.case-img {
    height: 220px;
    background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
    display: flex;
    align-items: center;
    justify-content: center;
}
.case-body {
    padding: 24px;
}
.case-body .case-tag {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    background: rgba(249,115,22,0.08);
    color: var(--accent);
    margin-bottom: 8px;
}
.case-body h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 6px;
}
.case-body p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
}

/* ========== CONTACT ========== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
}
.contact-info h2 {
    font-size: 26px;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 14px;
    letter-spacing: -0.5px;
}
.contact-info > p {
    color: var(--text-light);
    margin-bottom: 32px;
    line-height: 1.7;
}
.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.contact-method {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 18px 22px;
    background: var(--bg-alt);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: var(--transition);
}
.contact-method:hover {
    border-color: rgba(249,115,22,0.15);
    box-shadow: var(--shadow-sm);
}
.contact-method i {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    background: var(--primary);
    color: #fff;
    flex-shrink: 0;
}
.contact-method .method-whatsapp i { background: #25D366; }
.contact-method .method-wechat i { background: #07C160; }
.contact-method .detail h4 {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 400;
}
.contact-method .detail p {
    font-size: 16px;
    font-weight: 600;
    color: var(--primary);
}
.contact-form {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 40px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}
.contact-form h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 6px;
}
.form-group {
    margin-bottom: 18px;
}
.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 6px;
}
.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 15px;
    transition: var(--transition);
    font-family: inherit;
    background: #fff;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(249,115,22,0.1);
}
.form-group textarea {
    height: 120px;
    resize: vertical;
}
.btn-submit {
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    color: #fff;
    padding: 14px 36px;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 14px rgba(249,115,22,0.3);
}
.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(249,115,22,0.4);
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 992px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .products-grid { grid-template-columns: repeat(2, 1fr); }
    .app-grid { grid-template-columns: repeat(3, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .hero h1 { font-size: 40px; }
    .hero h1 span { font-size: 24px; }
    .product-detail-card { grid-template-columns: 1fr; }
    .pd-img { height: 200px; }
    .about-intro { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .about-values { grid-template-columns: 1fr; }
    .cases-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .top-bar .container { justify-content: center; gap: 16px; font-size: 12px; }

    .nav {
        display: none;
        position: absolute;
        top: 74px;
        left: 0;
        right: 0;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-lg);
        gap: 2px;
    }
    .nav.show { display: flex; }
    .nav a {
        padding: 12px 16px;
        border-radius: var(--radius-sm);
        border-bottom: none;
    }
    .btn-whatsapp-nav { display: none; }
    .hamburger { display: block; }

    .hero { min-height: 70vh; }
    .hero h1 { font-size: 30px; }
    .hero h1 span { font-size: 20px; }
    .hero p { font-size: 15px; }

    .features-grid { grid-template-columns: 1fr; }
    .products-grid { grid-template-columns: 1fr; }
    .app-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr; }
    .section { padding: 60px 0; }
    .section-title { font-size: 26px; }
    .cta-section h2 { font-size: 26px; }
    .social-links { flex-wrap: wrap; }
    .hero-btns .btn { width: 100%; justify-content: center; }
    .cta-btns .btn { width: 100%; justify-content: center; }
    .page-banner h1 { font-size: 26px; }
    .product-detail-card { padding: 24px; }
    .pd-table td { font-size: 13px; }
    .stat-card .number { font-size: 28px; }
    .contact-form { padding: 24px; }
    .form-row { grid-template-columns: 1fr; }
}