/* ============================================
   四川晟耀科技 - 企业展示网站
   主样式表 v2.0
   ============================================ */

/* ===== CSS Variables ===== */
:root {
    --primary: #0d47a1;
    --primary-dark: #002171;
    --primary-light: #5472d3;
    --accent: #ff6d00;
    --accent-light: #ff9e40;
    --accent-dark: #c43e00;
    --bg-white: #ffffff;
    --bg-light: #f5f7fb;
    --bg-gray: #eef1f6;
    --text-dark: #1a1a2e;
    --text-body: #3a3a52;
    --text-gray: #6b7280;
    --text-light: #9ca3af;
    --border: #e5e7eb;
    --border-light: #f3f4f6;
    --success: #10b981;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-md: 0 10px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.05);
    --shadow-lg: 0 20px 40px -10px rgba(0,0,0,0.1), 0 10px 15px -5px rgba(0,0,0,0.06);
    --shadow-xl: 0 25px 50px -12px rgba(0,0,0,0.15);
    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: 'Inter', 'Noto Sans SC', 'Microsoft YaHei', 'PingFang SC', sans-serif;
    color: var(--text-body);
    line-height: 1.7;
    background: var(--bg-white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; height: auto; }

/* ===== Animations ===== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInLeft {
    from { opacity: 0; transform: translateX(-30px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes fadeInRight {
    from { opacity: 0; transform: translateX(30px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

@keyframes spin-slow {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition-slow);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Navbar ===== */
.navbar {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
    border-bottom: 1px solid transparent;
}

.navbar.scrolled {
    box-shadow: 0 2px 20px rgba(0,0,0,0.08);
    border-bottom-color: var(--border);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 12px;
    padding-bottom: 12px;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    flex-shrink: 0;
}

.logo img { height: 42px; }

.logo-text { display: flex; flex-direction: column; }

.logo-cn {
    font-size: 20px;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: 1px;
    line-height: 1.2;
}

.logo-en {
    font-size: 10px;
    color: var(--text-gray);
    letter-spacing: 2px;
    text-transform: uppercase;
    font-weight: 600;
}

/* Company Name beside Logo */
.logo-company-name {
    display: flex;
    flex-direction: column;
    margin-left: 4px;
    padding-left: 14px;
    border-left: 2px solid var(--border);
}

.logo-cn-name {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-dark);
    letter-spacing: 1px;
    line-height: 1.3;
    white-space: nowrap;
}

.logo-en-name {
    font-size: 10px;
    color: var(--text-gray);
    letter-spacing: 1.5px;
    font-weight: 500;
    white-space: nowrap;
}

/* Nav Right (Quote + Lang + Hamburger) */
.nav-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Quote Button in Navbar */
.btn-quote-nav {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    background: linear-gradient(135deg, #ff6d00, #ff3d00);
    color: #fff;
    padding: 10px 20px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 700;
    text-decoration: none;
    white-space: nowrap;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 15px rgba(255, 61, 0, 0.35);
    position: relative;
    overflow: hidden;
    animation: quotePulse 2.5s ease-in-out infinite;
}

.btn-quote-nav::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #ff9e40, #ff6d00);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.btn-quote-nav:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 61, 0, 0.5);
}

.btn-quote-nav:hover::before {
    opacity: 1;
}

.btn-quote-nav i,
.btn-quote-nav span {
    position: relative;
    z-index: 1;
}

@keyframes quotePulse {
    0%, 100% { box-shadow: 0 4px 15px rgba(255, 61, 0, 0.35); }
    50% { box-shadow: 0 4px 25px rgba(255, 61, 0, 0.55); }
}

/* Language Dropdown Select */
.lang-select-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.lang-globe-icon {
    position: absolute;
    left: 12px;
    color: var(--text-gray);
    font-size: 14px;
    pointer-events: none;
    transition: var(--transition);
}

.lang-select {
    appearance: none;
    -webkit-appearance: none;
    background: var(--bg-light);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 8px 16px 8px 36px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-dark);
    cursor: pointer;
    font-family: inherit;
    transition: var(--transition);
    min-width: 120px;
    outline: none;
}

.lang-select:hover {
    border-color: var(--primary-light);
    background: var(--bg-white);
}

.lang-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(13,71,161,0.08);
}

/* Nav Menu */
.nav-menu {
    display: flex;
    align-items: center;
    gap: 2px;
}

.nav-menu > li > a {
    display: block;
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-body);
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
}

.nav-menu > li > a::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 20px;
    height: 2px;
    background: var(--primary);
    border-radius: 1px;
    transition: transform 0.3s ease;
}

.nav-menu > li > a:hover { color: var(--primary); background: rgba(13,71,161,0.04); }
.nav-menu > li > a:hover::after { transform: translateX(-50%) scaleX(1); }
.nav-menu > li > a.active { color: var(--primary); font-weight: 600; }
.nav-menu > li > a.active::after { transform: translateX(-50%) scaleX(1); background: var(--accent); }

/* Dropdown */
.dropdown { position: relative; }

.dropdown > a::after {
    content: '\f107';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    margin-left: 4px;
    font-size: 10px;
    opacity: 0.5;
    position: static;
    transform: none;
    background: none;
    width: auto;
    height: auto;
    display: inline;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    background: var(--bg-white);
    min-width: 220px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.12);
    border-radius: var(--radius-lg);
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: var(--transition);
    z-index: 100;
    border: 1px solid var(--border);
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    font-size: 14px;
    color: var(--text-body);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.dropdown-menu li a:hover {
    background: var(--bg-light);
    color: var(--primary);
    padding-left: 20px;
}

.dropdown-menu li a i {
    color: var(--primary-light);
    width: 18px;
    text-align: center;
    font-size: 13px;
}

/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: var(--transition);
}

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

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

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

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 92vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(135deg, #060f1f 0%, #0d47a1 25%, #1565c0 55%, #0a3d7f 100%);
}

.hero-bg {
    position: absolute;
    inset: 0;
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 40%, rgba(255,109,0,0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(84,114,211,0.18) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 70%, rgba(13,71,161,0.25) 0%, transparent 50%);
}

.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: 0.4;
}

.hero-particles {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.particle {
    position: absolute;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    animation: float 6s ease-in-out infinite;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: #fff;
    max-width: 800px;
    padding: 0 24px;
    animation: fadeInUp 0.8s ease;
}

.hero-badge {
    display: inline-block;
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.15);
    padding: 8px 24px;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 1px;
    margin-bottom: 32px;
    color: rgba(255,255,255,0.9);
}

.hero-content h1 {
    font-size: clamp(32px, 6vw, 56px);
    font-weight: 900;
    margin-bottom: 16px;
    letter-spacing: 2px;
    line-height: 1.2;
    background: linear-gradient(135deg, #fff 0%, rgba(255,255,255,0.85) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: none;
}

.hero-subtitle {
    font-size: clamp(18px, 3vw, 24px);
    font-weight: 300;
    margin-bottom: 16px;
    opacity: 0.9;
    letter-spacing: 3px;
}

.hero-desc {
    font-size: 16px;
    margin-bottom: 44px;
    opacity: 0.7;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.8;
}

.hero-btns {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    color: #fff;
    padding: 15px 36px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: 0.5px;
    box-shadow: 0 4px 20px rgba(255,109,0,0.4);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--accent-light), var(--accent));
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(255,109,0,0.5);
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: transparent;
    color: #fff;
    padding: 15px 36px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 500;
    border: 2px solid rgba(255,255,255,0.3);
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: 0.5px;
}

.btn-outline:hover {
    border-color: #fff;
    background: rgba(255,255,255,0.1);
    transform: translateY(-3px);
}

.hero-scroll {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    color: rgba(255,255,255,0.5);
    font-size: 12px;
    animation: pulse 2s ease-in-out infinite;
}

.hero-scroll i {
    font-size: 14px;
    animation: float 2s ease-in-out infinite;
}

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

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

.section-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--primary);
    background: rgba(13,71,161,0.06);
    padding: 4px 14px;
    border-radius: 50px;
    margin-bottom: 16px;
    text-transform: uppercase;
}

.section-tag.light {
    color: rgba(255,255,255,0.8);
    background: rgba(255,255,255,0.1);
}

.section-header h2 {
    font-size: clamp(28px, 4vw, 38px);
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-header p {
    font-size: 16px;
    color: var(--text-gray);
    margin-top: 12px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.divider {
    width: 50px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    margin: 0 auto;
    border-radius: 2px;
}

.divider.light {
    background: linear-gradient(90deg, rgba(255,255,255,0.6), rgba(255,255,255,0.3));
}

/* ===== About ===== */
.about-section {
    background: var(--bg-white);
}

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

.about-card {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 40px 30px;
    text-align: center;
    transition: var(--transition-slow);
    position: relative;
    overflow: hidden;
}

.about-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0);
    transition: transform 0.5s ease;
}

.about-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.about-card:hover::before {
    transform: scaleX(1);
}

.about-card-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 24px;
    background: linear-gradient(135deg, rgba(13,71,161,0.08), rgba(255,109,0,0.06));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.about-card:hover .about-card-icon {
    transform: scale(1.05);
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
}

.about-card:hover .about-card-icon i {
    color: #fff;
}

.about-card-icon i {
    font-size: 28px;
    color: var(--primary);
    transition: var(--transition);
}

.about-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 14px;
}

.about-card p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.8;
}

.about-card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 16px;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary);
    transition: var(--transition);
    opacity: 0;
    transform: translateY(8px);
}

.about-card:hover .about-card-link {
    opacity: 1;
    transform: translateY(0);
}

.about-card-link i {
    font-size: 11px;
    transition: var(--transition);
}

.about-card:hover .about-card-link i {
    transform: translateX(3px);
}

/* ===== Stats ===== */
.stats-section {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    padding: 70px 0;
    position: relative;
    overflow: hidden;
}

.stats-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 40px 40px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    position: relative;
    z-index: 1;
}

.stat-item {
    text-align: center;
    color: #fff;
    padding: 20px;
}

.stat-number {
    font-size: 48px;
    font-weight: 900;
    background: linear-gradient(135deg, #fff, var(--accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
    line-height: 1;
}

.stat-label {
    font-size: 14px;
    opacity: 0.75;
    letter-spacing: 1px;
}

/* ===== Products ===== */
.products-section {
    background: var(--bg-white);
    position: relative;
}

.products-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 400px;
    background: linear-gradient(180deg, var(--bg-light) 0%, transparent 100%);
    pointer-events: none;
    z-index: 0;
}

.products-section .container { position: relative; z-index: 1; }

.products-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.product-card {
    background: var(--bg-white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    transition: var(--transition-slow);
    cursor: pointer;
    position: relative;
    border: 1px solid var(--border);
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.12);
    border-color: var(--primary-light);
}

.product-card-img {
    width: 100%;
    aspect-ratio: 1;
    background: linear-gradient(135deg, #eef2fb, #e2e8f6);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.product-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

/* Logo Watermark on Product Images */
.product-card-img::before {
    content: '';
    position: absolute;
    bottom: 12px;
    right: 12px;
    width: 48px;
    height: 48px;
    background-image: url('../images/logo.png');
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    opacity: 0.45;
    z-index: 2;
    pointer-events: none;
    transition: opacity 0.3s ease;
    filter: drop-shadow(0 1px 2px rgba(0,0,0,0.3));
}

.product-card:hover .product-card-img::before {
    opacity: 0.6;
}

.product-card:hover .product-card-img img {
    transform: scale(1.1);
}

.product-card-img-fallback {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: absolute;
    top: 0;
    left: 0;
}

.product-card-img::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 50%;
    background: linear-gradient(to top, rgba(13,71,161,0.06), transparent);
}

.product-card-img i {
    font-size: 48px;
    color: var(--primary);
    transition: var(--transition);
    position: relative;
    z-index: 1;
}

.product-card:hover .product-card-img i {
    transform: scale(1.15);
    color: var(--accent);
}

.product-card-img .card-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    color: #fff;
    padding: 5px 14px;
    border-radius: 50px;
    font-size: 11px;
    font-weight: 700;
    z-index: 1;
    letter-spacing: 0.5px;
}

.product-card-body {
    padding: 24px 20px;
    text-align: center;
}

.product-card-body h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.product-card-body p {
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.6;
}

.product-card-body .card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary);
    font-size: 13px;
    font-weight: 600;
    margin-top: 12px;
    transition: var(--transition);
}

.product-card-body .card-link i {
    font-size: 11px;
    transition: var(--transition);
}

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

.product-card:hover .card-link i {
    transform: translateX(3px);
}

/* ===== Advantages ===== */
.advantages-section {
    background: linear-gradient(135deg, #080e1a 0%, #0d2346 50%, #080e1a 100%);
    color: #fff;
    position: relative;
    overflow: hidden;
}

.advantages-section::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -15%;
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(255,109,0,0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.advantages-section::after {
    content: '';
    position: absolute;
    bottom: -20%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(84,114,211,0.08) 0%, transparent 70%);
    border-radius: 50%;
}

.advantages-section .section-header h2 {
    color: #fff;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    position: relative;
    z-index: 1;
}

.advantage-card {
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-xl);
    padding: 40px 28px;
    text-align: center;
    transition: var(--transition-slow);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    transition: width 0.5s ease;
}

.advantage-card:hover::before {
    width: 80%;
}

.advantage-card:hover {
    background: rgba(255,255,255,0.06);
    border-color: rgba(255,255,255,0.12);
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.advantage-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 22px;
    background: linear-gradient(135deg, rgba(255,109,0,0.2), rgba(255,109,0,0.05));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.advantage-card:hover .advantage-icon {
    background: var(--accent);
    transform: rotateY(180deg);
    box-shadow: 0 8px 25px rgba(255,109,0,0.3);
}

.advantage-icon i {
    font-size: 28px;
    color: var(--accent);
    transition: var(--transition);
}

.advantage-card:hover .advantage-icon i {
    color: #fff;
    transform: rotateY(180deg);
}

.advantage-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
}

.advantage-card p {
    font-size: 14px;
    opacity: 0.7;
    line-height: 1.7;
}

/* ===== Contact ===== */
.contact-section {
    background: var(--bg-white);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 50px;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-card {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 22px 24px;
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    border: 1px solid transparent;
    cursor: default;
}

.contact-card:hover {
    background: var(--bg-white);
    border-color: var(--border);
    box-shadow: var(--shadow-md);
    transform: translateX(6px);
}

.contact-card-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: var(--transition);
}

.contact-card:hover .contact-card-icon {
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    transform: scale(1.1);
}

.contact-card-icon i {
    font-size: 20px;
    color: #fff;
}

.contact-card h4 {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 4px;
}

.contact-card p {
    font-size: 14px;
    color: var(--text-gray);
}

.contact-card a {
    color: var(--primary);
    transition: var(--transition);
    font-weight: 500;
}

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

/* Contact Form */
.contact-form-wrapper {
    background: var(--bg-white);
    border-radius: var(--radius-xl);
    padding: 40px;
    border: 1px solid var(--border);
    box-shadow: 0 4px 24px rgba(0,0,0,0.04);
}

.contact-form h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.contact-form > p {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 28px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 13px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    font-family: inherit;
    transition: var(--transition);
    background: var(--bg-light);
    color: var(--text-dark);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(13,71,161,0.06);
    background: var(--bg-white);
}

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

.btn-submit {
    width: 100%;
    justify-content: center;
    font-size: 16px;
    padding: 16px 32px;
    margin-top: 8px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    box-shadow: 0 4px 15px rgba(13,71,161,0.3);
}

.btn-submit:hover {
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    box-shadow: 0 8px 25px rgba(255,109,0,0.4);
}

/* ===== Footer ===== */
.footer {
    background: #0a1628;
    color: rgba(255,255,255,0.7);
}

.footer-top {
    padding: 70px 0 40px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.8fr 1fr 1fr 1.5fr;
    gap: 50px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 18px;
}

.footer-logo img {
    height: 40px;
}

.footer-logo h3 {
    font-size: 16px;
    font-weight: 700;
    color: #fff;
    line-height: 1.3;
}

.footer-logo span {
    font-size: 10px;
    color: rgba(255,255,255,0.4);
    letter-spacing: 2px;
}

.footer-about p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
    opacity: 0.7;
}

.footer-social {
    display: flex;
    gap: 10px;
}

.footer-social a {
    width: 38px;
    height: 38px;
    background: rgba(255,255,255,0.06);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.6);
    font-size: 15px;
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--accent);
    color: #fff;
    transform: translateY(-3px);
}

.footer-col h4 {
    font-size: 15px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 24px;
    height: 2px;
    background: var(--accent);
    border-radius: 1px;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    font-size: 14px;
    opacity: 0.7;
    transition: var(--transition);
    display: inline-block;
}

.footer-col ul li a:hover {
    opacity: 1;
    color: var(--accent);
    padding-left: 6px;
}

.footer-contact-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 14px;
    opacity: 0.7;
    margin-bottom: 12px;
    line-height: 1.6;
}

.footer-contact-list li i {
    color: var(--accent);
    margin-top: 4px;
    width: 14px;
    flex-shrink: 0;
}

.footer-contact-list li a {
    color: inherit;
    transition: var(--transition);
}

.footer-contact-list li a:hover {
    color: var(--accent);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding: 20px 0;
    text-align: center;
    font-size: 13px;
    opacity: 0.5;
}

/* ===== Back to Top ===== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 16px;
    cursor: pointer;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
    box-shadow: 0 8px 25px rgba(13,71,161,0.3);
}

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

.back-to-top:hover {
    background: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(255,109,0,0.4);
}

/* ===== Product Sub Pages ===== */
.product-hero {
    background: linear-gradient(135deg, #0a1628 0%, #0d47a1 50%, #0a1628 100%);
    color: #fff;
    padding: 120px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.product-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(ellipse at 30% 50%, rgba(255,109,0,0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 30%, rgba(84,114,211,0.12) 0%, transparent 50%);
}

.product-hero .container {
    position: relative;
    z-index: 1;
}

.product-hero .breadcrumb {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 14px;
    opacity: 0.7;
    margin-bottom: 24px;
}

.product-hero .breadcrumb a {
    color: var(--accent-light);
    transition: var(--transition);
}

.product-hero .breadcrumb a:hover {
    color: #fff;
}

.product-hero .breadcrumb i {
    font-size: 10px;
}

.product-hero h1 {
    font-size: clamp(28px, 5vw, 44px);
    font-weight: 900;
    margin-bottom: 16px;
}

.product-hero .hero-icon {
    font-size: 56px;
    color: var(--accent);
    margin-bottom: 24px;
    animation: float 3s ease-in-out infinite;
}

.product-hero p {
    font-size: 16px;
    opacity: 0.75;
    max-width: 600px;
    margin: 0 auto;
}

.product-detail-section {
    padding: 80px 0;
    background: var(--bg-white);
}

.product-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.product-gallery {
    background: var(--bg-light);
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid var(--border);
}

.product-gallery .main-image {
    aspect-ratio: 4/3;
    background: linear-gradient(135deg, #e8ecf4, #dce3f0);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    position: relative;
    overflow: hidden;
}

/* Logo Watermark on Main Gallery Image */
.product-gallery .main-image::after {
    content: '';
    position: absolute;
    bottom: 16px;
    right: 16px;
    width: 56px;
    height: 56px;
    background-image: url('../images/logo.png');
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    opacity: 0.35;
    z-index: 2;
    pointer-events: none;
    filter: drop-shadow(0 1px 2px rgba(0,0,0,0.3));
}

.product-gallery .main-image i {
    font-size: 80px;
    margin-bottom: 12px;
}

.product-gallery .main-image span {
    font-size: 14px;
    color: var(--text-gray);
}

.product-gallery .thumb-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2px;
    padding: 2px;
}

.product-gallery .thumb {
    aspect-ratio: 1;
    background: #e8ecf4;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 24px;
    cursor: pointer;
    transition: var(--transition);
}

.product-gallery .thumb:hover {
    background: var(--primary);
    color: #fff;
}

.product-info h2 {
    font-size: 28px;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.product-info .info-desc {
    font-size: 15px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 28px;
}

.product-info .specs-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border);
}

.specs-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 28px;
}

.spec-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: var(--bg-light);
    border-radius: var(--radius);
    font-size: 14px;
}

.spec-item i {
    color: var(--accent);
    font-size: 14px;
}

.features-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 28px;
}

.feature-tag {
    padding: 8px 16px;
    background: linear-gradient(135deg, rgba(13,71,161,0.06), rgba(255,109,0,0.04));
    border: 1px solid var(--border);
    border-radius: 50px;
    font-size: 13px;
    color: var(--primary);
    font-weight: 500;
}

.product-info .btn-group {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* Applications Section */
.applications-section {
    padding: 80px 0;
    background: var(--bg-light);
}

.applications-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.app-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 28px 22px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border);
}

.app-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.app-card i {
    font-size: 32px;
    color: var(--primary);
    margin-bottom: 14px;
}

.app-card h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
}

/* Related Products */
.related-products {
    padding: 80px 0;
    background: var(--bg-white);
}

/* ===== Responsive ===== */
@media (max-width: 1200px) {
    .products-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 1024px) {
    .advantages-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-content { grid-template-columns: 1fr 1fr; }
    .product-detail-grid { grid-template-columns: 1fr; }
    .applications-grid { grid-template-columns: repeat(2, 1fr); }
    .logo-company-name { display: none; }
    .lang-select { min-width: 100px; padding: 6px 12px 6px 32px; font-size: 12px; }
}

@media (max-width: 768px) {
    section { padding: 60px 0; }

    .hamburger { display: flex; }

    .logo-company-name { display: none; }
    .lang-select-wrapper { margin-right: 4px; }
    .lang-select { min-width: 90px; font-size: 12px; padding: 6px 10px 6px 30px; }
    .nav-right { gap: 8px; }
    .btn-quote-nav { padding: 8px 14px; font-size: 12px; }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-white);
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-xl);
        transform: translateY(-120%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
        border-bottom: 1px solid var(--border);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-menu > li { width: 100%; }

    .nav-menu > li > a {
        padding: 12px 16px;
        font-size: 15px;
    }

    .dropdown > a::before { display: none; }

    .dropdown-menu {
        position: static;
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        transform: none;
        display: none;
        border: none;
        padding: 0 0 0 20px;
    }

    .dropdown.active .dropdown-menu { display: block; }

    .hero { min-height: 80vh; }

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

    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .stat-number { font-size: 36px; }

    .products-grid { grid-template-columns: repeat(2, 1fr); }

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

    .contact-content { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }

    .footer-content { grid-template-columns: 1fr; gap: 30px; }

    .applications-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ===== About Sub Pages ===== */
.about-sub-hero {
    background: linear-gradient(135deg, #0a1628 0%, #0d47a1 50%, #0a1628 100%);
    color: #fff;
    padding: 120px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.about-sub-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(ellipse at 30% 50%, rgba(255,109,0,0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 30%, rgba(84,114,211,0.12) 0%, transparent 50%);
}

.about-sub-hero .container {
    position: relative;
    z-index: 1;
}

.about-sub-hero .breadcrumb {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 14px;
    opacity: 0.7;
    margin-bottom: 24px;
}

.about-sub-hero .breadcrumb a {
    color: var(--accent-light);
    transition: var(--transition);
}

.about-sub-hero .breadcrumb a:hover { color: #fff; }

.about-sub-hero .breadcrumb i { font-size: 10px; }

.about-sub-hero h1 {
    font-size: clamp(28px, 5vw, 44px);
    font-weight: 900;
    margin-bottom: 16px;
}

.about-sub-hero p {
    font-size: 16px;
    opacity: 0.75;
    max-width: 600px;
    margin: 0 auto;
}

.about-sub-icon {
    font-size: 56px;
    color: var(--accent);
    margin-bottom: 24px;
    animation: float 3s ease-in-out infinite;
}

.about-sub-content {
    padding: 80px 0;
    background: var(--bg-white);
}

.about-sub-block {
    margin-bottom: 80px;
}

.about-sub-block:last-child { margin-bottom: 0; }

.about-sub-block h2 {
    font-size: 30px;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.about-sub-block > .divider {
    margin: 0 0 40px 0;
}

.about-sub-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-sub-text .section-tag {
    margin-bottom: 12px;
}

.about-sub-text h2 {
    margin-bottom: 20px;
}

.about-sub-text p {
    font-size: 15px;
    color: var(--text-gray);
    line-height: 1.9;
    margin-bottom: 16px;
}

.about-sub-visual {
    display: flex;
    justify-content: center;
}

.about-sub-img {
    width: 100%;
    aspect-ratio: 4/3;
    background: linear-gradient(135deg, var(--bg-light), #e0e7f5);
    border-radius: var(--radius-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
}

.about-sub-img i {
    font-size: 72px;
    color: var(--primary);
    margin-bottom: 12px;
    opacity: 0.6;
}

.about-sub-img span {
    font-size: 14px;
    color: var(--text-gray);
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: 40px;
    border-left: 3px solid var(--border);
    margin-left: 20px;
}

.timeline-item {
    position: relative;
    margin-bottom: 36px;
    padding-left: 36px;
}

.timeline-item:last-child { margin-bottom: 0; }

.timeline-dot {
    position: absolute;
    left: -57px;
    top: 0;
    width: 44px;
    height: 44px;
    background: var(--bg-white);
    border: 3px solid var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 16px;
    z-index: 1;
    transition: var(--transition);
}

.timeline-item:hover .timeline-dot {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 0 0 8px rgba(13,71,161,0.1);
}

.timeline-content {
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    padding: 24px 28px;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.timeline-item:hover .timeline-content {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.timeline-content h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.timeline-content p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.7;
}

/* Strength Grid */
.strength-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.strength-card {
    background: var(--bg-light);
    border-radius: var(--radius-xl);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border);
}

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

.strength-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, rgba(13,71,161,0.08), rgba(255,109,0,0.06));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    color: var(--primary);
}

.strength-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.strength-card p {
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.7;
}

/* Culture Grid */
.culture-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.culture-item {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 36px 24px;
    text-align: center;
    transition: var(--transition);
}

.culture-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.culture-icon-wrap {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: #fff;
}

.culture-item h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.culture-item p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.7;
}

/* Business Products Grid */
.biz-products-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.biz-product-card {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 28px 22px;
    text-align: center;
    transition: var(--transition-slow);
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
}

.biz-product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.biz-p-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, rgba(13,71,161,0.08), rgba(255,109,0,0.06));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    color: var(--primary);
    margin-bottom: 16px;
    transition: var(--transition);
}

.biz-product-card:hover .biz-p-icon {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
}

.biz-product-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 6px;
}

.biz-p-series {
    display: inline-block;
    font-size: 11px;
    color: var(--accent);
    background: rgba(255,109,0,0.08);
    padding: 2px 10px;
    border-radius: 50px;
    margin-bottom: 12px;
    font-weight: 500;
}

.biz-product-card p {
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.6;
    margin-bottom: 14px;
    flex: 1;
}

.biz-p-link {
    font-size: 13px;
    font-weight: 600;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}

.biz-product-card:hover .biz-p-link i {
    transform: translateX(4px);
}

/* Business Mode Grid */
.biz-mode-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.biz-mode-card {
    background: var(--bg-light);
    border-radius: var(--radius-xl);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border);
    position: relative;
}

.biz-mode-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.biz-mode-num {
    font-size: 42px;
    font-weight: 900;
    color: rgba(13,71,161,0.08);
    margin-bottom: 12px;
    line-height: 1;
}

.biz-mode-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.biz-mode-card p {
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.7;
}

/* Process Steps */
.process-steps {
    display: flex;
    justify-content: center;
    gap: 0;
}

.process-step {
    flex: 1;
    text-align: center;
    padding: 0 16px;
    position: relative;
}

.process-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    color: #fff;
    position: relative;
    z-index: 2;
    transition: var(--transition);
}

.process-step:hover .process-icon {
    transform: scale(1.1);
    box-shadow: 0 8px 25px rgba(13,71,161,0.3);
}

.process-line {
    position: absolute;
    top: 35px;
    left: calc(50% + 35px);
    right: calc(-50% + 35px);
    height: 2px;
    background: var(--border);
    z-index: 1;
}

.process-step:last-child .process-line { display: none; }

.process-step h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.process-step p {
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.5;
}

/* Application Industry Cards */
.app-industry-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.app-industry-card {
    background: var(--bg-light);
    border-radius: var(--radius-xl);
    padding: 32px 28px;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.app-industry-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.app-ind-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.app-ind-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: #fff;
    flex-shrink: 0;
}

.app-ind-header h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-dark);
}

.app-ind-header span {
    font-size: 12px;
    color: var(--accent);
    font-weight: 500;
}

.app-industry-card > p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 16px;
}

.app-ind-products {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    font-size: 13px;
    color: var(--text-gray);
}

.app-prod-tag {
    padding: 4px 12px;
    background: rgba(13,71,161,0.06);
    border: 1px solid var(--border);
    border-radius: 50px;
    font-size: 12px;
    color: var(--primary);
    font-weight: 500;
    transition: var(--transition);
}

.app-prod-tag:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* Case Cards */
.case-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.case-card {
    background: var(--bg-light);
    border-radius: var(--radius-xl);
    padding: 28px 22px;
    text-align: center;
    border: 1px solid var(--border);
    transition: var(--transition);
}

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

.case-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, rgba(255,109,0,0.12), rgba(255,109,0,0.04));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--accent);
}

.case-card h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.case-card p {
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.7;
}

/* CTA Block */
.about-sub-cta {
    text-align: center;
    background: linear-gradient(135deg, rgba(13,71,161,0.04), rgba(255,109,0,0.03));
    border-radius: var(--radius-xl);
    padding: 50px 30px;
    border: 1px solid var(--border);
}

.about-sub-cta h3 {
    font-size: 24px;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.about-sub-cta p {
    font-size: 15px;
    color: var(--text-gray);
    margin-bottom: 28px;
}

.about-sub-cta .hero-btns {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* About sub pages responsive */
@media (max-width: 1024px) {
    .about-sub-grid { grid-template-columns: 1fr; gap: 30px; }
    .strength-grid { grid-template-columns: repeat(2, 1fr); }
    .culture-grid { grid-template-columns: repeat(2, 1fr); }
    .biz-products-grid { grid-template-columns: repeat(2, 1fr); }
    .biz-mode-grid { grid-template-columns: repeat(2, 1fr); }
    .process-steps { flex-wrap: wrap; gap: 20px; }
    .process-step { flex: 0 0 calc(33.333% - 14px); }
    .process-line { display: none; }
    .app-industry-grid { grid-template-columns: 1fr; }
    .case-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .about-sub-hero { padding: 100px 0 60px; }
    .about-sub-content { padding: 60px 0; }
    .about-sub-block { margin-bottom: 60px; }
    .about-sub-block h2 { font-size: 24px; }
    .timeline { padding-left: 20px; margin-left: 10px; }
    .timeline-item { padding-left: 20px; }
    .timeline-dot { left: -35px; width: 36px; height: 36px; font-size: 14px; }
    .strength-grid { grid-template-columns: 1fr 1fr; }
    .culture-grid { grid-template-columns: 1fr 1fr; }
    .biz-products-grid { grid-template-columns: 1fr 1fr; }
    .biz-mode-grid { grid-template-columns: 1fr 1fr; }
    .process-steps { flex-direction: column; align-items: center; }
    .process-step { flex: 0 0 auto; max-width: 280px; width: 100%; }
    .case-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
    .products-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .hero-btns { flex-direction: column; align-items: center; }
    .contact-form-wrapper { padding: 24px; }
    .about-sub-grid { grid-template-columns: 1fr; }
    .strength-grid { grid-template-columns: 1fr; }
    .culture-grid { grid-template-columns: 1fr; }
    .biz-products-grid { grid-template-columns: 1fr; }
    .biz-mode-grid { grid-template-columns: 1fr; }
    .case-grid { grid-template-columns: 1fr; }
    .about-sub-cta { padding: 36px 20px; }
    .about-sub-cta h3 { font-size: 20px; }
}

/* ============================================
   产品图片画廊 V2 - 动态自适应排版
   ============================================ */

.product-gallery-wrapper {
    width: 100%;
}

.product-gallery-v2 {
    --gallery-cols: 3;
    display: grid;
    grid-template-columns: repeat(var(--gallery-cols), 1fr);
    gap: 8px;
    border-radius: var(--radius-xl);
    overflow: hidden;
    background: var(--bg-light);
    border: 1px solid var(--border);
    min-height: 300px;
}

.gallery-item {
    position: relative;
    aspect-ratio: 4/3;
    overflow: hidden;
    cursor: pointer;
    background: #e8ecf4;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

/* Logo Watermark on Gallery Images */
.gallery-item::after {
    content: '';
    position: absolute;
    bottom: 10px;
    right: 10px;
    width: 40px;
    height: 40px;
    background-image: url('../images/logo.png');
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    opacity: 0.4;
    z-index: 2;
    pointer-events: none;
    filter: drop-shadow(0 1px 2px rgba(0,0,0,0.3));
    transition: opacity 0.3s ease;
}

.gallery-item:hover::after {
    opacity: 0.55;
}

.gallery-item:hover img {
    transform: scale(1.05);
}

.gallery-overlay {
    position: absolute;
    inset: 0;
    background: rgba(13, 71, 161, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.gallery-item:hover .gallery-overlay {
    opacity: 1;
}

.gallery-overlay i {
    color: #fff;
    font-size: 28px;
    transform: scale(0.8);
    transition: transform 0.3s ease;
}

.gallery-item:hover .gallery-overlay i {
    transform: scale(1);
}

/* 1-3张图片时首张突出显示 */
.gallery-item-large {
    grid-column: 1 / -1;
    aspect-ratio: 16/9;
}

/* 加载和空状态 */
.gallery-loading,
.gallery-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    color: var(--text-gray);
    font-size: 14px;
    gap: 12px;
}

.gallery-empty i {
    font-size: 48px;
    color: var(--text-light);
}

.loading-spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin-slow 0.8s linear infinite;
}

/* ============================================
   灯箱
   ============================================ */

.gallery-lightbox {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.gallery-lightbox.active {
    opacity: 1;
    visibility: visible;
}

.lightbox-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.92);
    cursor: pointer;
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 24px;
    width: 44px;
    height: 44px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    color: #fff;
    font-size: 18px;
    cursor: pointer;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

.lightbox-prev,
.lightbox-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    color: #fff;
    font-size: 18px;
    cursor: pointer;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.lightbox-prev { left: 24px; }
.lightbox-next { right: 24px; }

.lightbox-prev:hover,
.lightbox-next:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-50%) scale(1.1);
}

.lightbox-content {
    position: relative;
    z-index: 1;
    max-width: 90vw;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.lightbox-content img {
    max-width: 90vw;
    max-height: 80vh;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

/* Logo Watermark on Lightbox */
.lightbox-content::after {
    content: '';
    position: absolute;
    bottom: 16px;
    right: 16px;
    width: 50px;
    height: 50px;
    background-image: url('../images/logo.png');
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    opacity: 0.5;
    z-index: 3;
    pointer-events: none;
    filter: drop-shadow(0 1px 2px rgba(0,0,0,0.4));
}

.lightbox-counter {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    margin-top: 16px;
    letter-spacing: 1px;
}

/* ============================================
   新闻资讯页面
   ============================================ */

.news-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.news-card {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 32px 28px;
    transition: var(--transition-slow);
    position: relative;
}

.news-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.news-date {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 14px;
}

.news-date i {
    font-size: 12px;
}

.news-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
    line-height: 1.5;
    transition: var(--transition);
}

.news-card:hover h3 {
    color: var(--primary);
}

.news-card p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 16px;
}

.news-read-more {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary);
    cursor: pointer;
    transition: var(--transition);
}

.news-read-more i {
    font-size: 11px;
    transition: var(--transition);
}

.news-card:hover .news-read-more i {
    transform: translateX(4px);
}

/* ===== 今日更新标识 ===== */
.news-today-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, #ff6d00, #ff3d00);
    color: #fff;
    font-size: 14px;
    font-weight: 700;
    padding: 10px 22px;
    border-radius: 50px;
    margin-bottom: 24px;
    animation: todayPulse 2s ease-in-out infinite;
    box-shadow: 0 4px 15px rgba(255, 61, 0, 0.3);
}

.news-today-badge i {
    animation: todaySpin 3s linear infinite;
}

@keyframes todayPulse {
    0%, 100% { box-shadow: 0 4px 15px rgba(255, 61, 0, 0.3); }
    50% { box-shadow: 0 4px 30px rgba(255, 61, 0, 0.6); }
}

@keyframes todaySpin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ===== 新闻分类标签 ===== */
.news-category-tag {
    display: inline-block;
    font-size: 11px;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 12px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.news-cat-company {
    background: linear-gradient(135deg, #e3f2fd, #bbdefb);
    color: #0d47a1;
    border: 1px solid #90caf9;
}

.news-cat-industry {
    background: linear-gradient(135deg, #fff3e0, #ffe0b2);
    color: #e65100;
    border: 1px solid #ffcc80;
}

.news-card[data-category="company"] {
    border-left: 3px solid var(--primary);
}

.news-card[data-category="industry"] {
    border-left: 3px solid var(--accent);
}

.news-card[data-category="company"]::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(13,71,161,0.03), transparent);
    border-radius: var(--radius-xl);
    pointer-events: none;
    z-index: 0;
}

.news-pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 40px;
}

.page-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--bg-white);
    color: var(--text-body);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.page-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.page-btn.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* ===== 新闻详情弹窗 ===== */
.news-modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    padding: 20px;
}

.news-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.news-modal {
    background: var(--bg-white);
    border-radius: var(--radius-xl);
    max-width: 680px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    padding: 40px 36px;
    position: relative;
    box-shadow: var(--shadow-xl);
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.news-modal-overlay.active .news-modal {
    transform: translateY(0);
}

.news-modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: none;
    background: var(--bg-light);
    color: var(--text-gray);
    font-size: 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.news-modal-close:hover {
    background: var(--primary);
    color: #fff;
}

.news-modal-date {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 12px;
}

.news-modal-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-dark);
    line-height: 1.4;
    margin-bottom: 16px;
}

.news-modal-divider {
    width: 60px;
    height: 3px;
    background: var(--accent);
    border-radius: 2px;
    margin-bottom: 20px;
}

.news-modal-body {
    font-size: 15px;
    color: var(--text-body);
    line-height: 2;
}

.news-modal-body p {
    margin-bottom: 16px;
    text-indent: 2em;
}

.news-modal-body p:last-child {
    margin-bottom: 0;
}

@media (max-width: 768px) {
    .news-modal {
        padding: 28px 22px;
        max-height: 90vh;
    }
    .news-modal-title {
        font-size: 18px;
    }
    .news-modal-body {
        font-size: 14px;
        line-height: 1.8;
    }
}

/* ============================================
   下载中心页面
   ============================================ */

.dl-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.dl-card {
    display: flex;
    align-items: center;
    gap: 20px;
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px 28px;
    transition: var(--transition-slow);
}

.dl-card:hover {
    transform: translateX(6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.dl-icon {
    width: 56px;
    height: 56px;
    min-width: 56px;
    background: linear-gradient(135deg, rgba(13, 71, 161, 0.08), rgba(255, 109, 0, 0.06));
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--primary);
}

.dl-info {
    flex: 1;
    min-width: 0;
}

.dl-info h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 6px;
}

.dl-info p {
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.6;
    margin-bottom: 6px;
}

.dl-meta {
    font-size: 12px;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 6px;
}

.dl-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    background: var(--primary);
    color: #fff;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
    white-space: nowrap;
    transition: var(--transition);
    cursor: pointer;
}

.dl-btn:hover {
    background: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 109, 0, 0.3);
}

.dl-empty {
    text-align: center;
    padding: 60px 0;
}

/* News & Downloads responsive */
@media (max-width: 1024px) {
    .news-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .dl-card {
        flex-direction: column;
        text-align: center;
        padding: 20px;
    }
    .dl-icon { margin: 0 auto; }
    .dl-btn { width: 100%; justify-content: center; }
    .product-gallery-v2 {
        --gallery-cols: 2 !important;
        min-height: 200px;
    }
    .lightbox-prev { left: 12px; }
    .lightbox-next { right: 12px; }
}

@media (max-width: 480px) {
    .product-gallery-v2 {
        --gallery-cols: 1 !important;
    }
    .news-card { padding: 24px 20px; }
    .news-card h3 { font-size: 16px; }
    .news-today-badge { font-size: 12px; padding: 8px 16px; }
    .news-category-tag { font-size: 10px; padding: 3px 10px; }
}