/* ==================== Philips Medical Design System ==================== */
:root {
    /* Primary Colors */
    --philips-blue: #0055B8;
    --philips-blue-dark: #003C82;
    --philips-blue-light: #3A7BD5;
    --philips-cyan: #0ABECC;
    --philips-teal: #009CB8;

    /* Dark Colors */
    --philips-bg-dark: #0A1628;
    --philips-gray-900: #1A1D21;

    /* Gray Scale */
    --philips-gray-700: #444D56;
    --philips-gray-500: #6B7280;
    --philips-gray-300: #C4C9D1;
    --philips-gray-100: #F0F2F5;

    /* White */
    --philips-white: #FFFFFF;

    /* Gradients */
    --philips-gradient: linear-gradient(135deg, var(--philips-blue) 0%, var(--philips-teal) 100%);
    --philips-gradient-hero: linear-gradient(135deg, #0A1628 0%, #0D2847 40%, #0055B8 100%);

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
    --shadow-blue: 0 8px 32px rgba(0,85,184,0.18);
    --shadow-blue-focus: 0 0 0 3px rgba(0,85,184,0.15);

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    /* Font Family */
    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--philips-gray-700);
    background: var(--philips-white);
    line-height: 1.7;
    font-weight: 400;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s;
}

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

ul {
    list-style: none;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
}

/* ==================== 1. Top Bar - 顶部公告栏 ==================== */
.top-bar {
    background: var(--philips-bg-dark);
    color: rgba(255, 255, 255, 0.8);
    font-size: 13px;
    padding: 8px 0;
    text-align: center;
    letter-spacing: 0.5px;
}

.top-bar span {
    color: var(--philips-cyan);
    font-weight: 600;
}

/* ==================== 2. Navigation - 导航栏 ==================== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--philips-gray-100);
    transition: box-shadow 0.3s;
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--philips-blue);
}

.logo-mark {
    width: 36px;
    height: 36px;
    background: var(--philips-gradient);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 16px;
    font-weight: 900;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 6px;
    list-style: none;
}

.nav-link {
    padding: 8px 18px;
    font-size: 14.5px;
    font-weight: 500;
    color: var(--philips-gray-700);
    border-radius: 6px;
    transition: all 0.25s;
    position: relative;
}

.nav-link:hover {
    color: var(--philips-blue);
    background: var(--philips-gray-100);
}

.nav-link.active {
    color: var(--philips-blue);
    font-weight: 600;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 18px;
    right: 18px;
    height: 3px;
    background: var(--philips-blue);
    border-radius: 3px 3px 0 0;
}

.nav-cta {
    background: var(--philips-blue) !important;
    color: white !important;
    font-weight: 600 !important;
    margin-left: 12px;
}

.nav-cta:hover {
    background: var(--philips-blue-dark) !important;
    transform: translateY(-1px);
    box-shadow: var(--shadow-blue);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 20px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
}

.nav-toggle span {
    display: block;
    width: 100%;
    height: 3px;
    background: var(--philips-gray-700);
    border-radius: 2px;
    transition: all 0.3s;
}

/* Mobile Navigation Active State */
.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

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

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Mobile Menu */
.nav-menu.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--philips-white);
    padding: 16px 32px 24px;
    box-shadow: var(--shadow-md);
    border-top: 1px solid var(--philips-gray-100);
    gap: 4px;
}

.nav-menu.active .nav-link {
    padding: 12px 16px;
    width: 100%;
}

.nav-menu.active .nav-cta {
    margin-left: 0;
    margin-top: 8px;
    text-align: center;
}

/* ==================== 3. Hero Section - 全宽深蓝渐变 ==================== */
.hero {
    position: relative;
    min-height: 680px;
    display: flex;
    align-items: center;
    background: var(--philips-gradient-hero);
    overflow: hidden;
}

.hero-bg-pattern {
    position: absolute;
    inset: 0;
    opacity: 0.06;
    background-image:
        radial-gradient(circle at 20% 50%, var(--philips-cyan) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, var(--philips-blue-light) 0%, transparent 40%),
        radial-gradient(circle at 60% 80%, var(--philips-teal) 0%, transparent 45%);
}

.hero-grid-lines {
    position: absolute;
    inset: 0;
    opacity: 0.04;
    background-image:
        linear-gradient(rgba(255,255,255,0.3) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.3) 1px, transparent 1px);
    background-size: 80px 80px;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 1280px;
    margin: 0 auto;
    padding: 80px 32px;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 60px;
    align-items: center;
    width: 100%;
}

.hero-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(10, 190, 204, 0.15);
    border: 1px solid rgba(10, 190, 204, 0.3);
    color: var(--philips-cyan);
    padding: 6px 18px;
    border-radius: 24px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 28px;
    letter-spacing: 1px;
}

.hero-label::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--philips-cyan);
    border-radius: 50%;
}

.hero-title {
    font-size: 54px;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
    color: white;
}

.hero-title .highlight {
    color: var(--philips-cyan);
}

.hero-subtitle {
    font-size: 17px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.75);
    margin-bottom: 36px;
    max-width: 520px;
}

.hero-buttons {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    max-width: 480px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.stat-number {
    font-size: 40px;
    font-weight: 900;
    color: white;
    line-height: 1;
}

.stat-suffix {
    font-size: 24px;
    font-weight: 700;
    color: var(--philips-cyan);
}

.stat-label {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
    font-weight: 500;
    margin-top: 4px;
}

/* Hero text utility classes */
.text-cyan {
    color: var(--philips-cyan);
}

.text-light {
    font-weight: 300;
}

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

.hero-stat-card {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    transition: all 0.3s;
}

.hero-stat-card:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(10, 190, 204, 0.3);
    transform: translateY(-4px);
}

.hero-stat-num {
    font-size: 40px;
    font-weight: 900;
    color: white;
    line-height: 1;
    margin-bottom: 4px;
}

.hero-stat-num .cyan {
    color: var(--philips-cyan);
}

.hero-stat-label {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
    font-weight: 500;
}

.hero-scroll {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.5);
    font-size: 12px;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid rgba(255, 255, 255, 0.3);
    border-bottom: 2px solid rgba(255, 255, 255, 0.3);
    transform: rotate(45deg);
    animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: rotate(45deg) translateY(0); }
    50% { transform: rotate(45deg) translateY(8px); }
}

/* ==================== Buttons ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 30px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all 0.3s;
    font-family: inherit;
    white-space: nowrap;
}

.btn-primary {
    background: var(--philips-white);
    color: var(--philips-blue);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.btn-outline {
    background: transparent;
    color: white;
    border: 1.5px solid rgba(255, 255, 255, 0.35);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.6);
}

.btn-blue {
    background: var(--philips-blue);
    color: white;
}

.btn-blue:hover {
    background: var(--philips-blue-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-blue);
}

.btn-cyan {
    background: var(--philips-cyan);
    color: white;
}

.btn-cyan:hover {
    background: #08a3b0;
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
}

/* ==================== 4. Trust Banner - 信任指标横条 ==================== */
.trust-banner {
    background: var(--philips-gray-100);
    padding: 48px 0;
    border-bottom: 1px solid #E5E7EB;
}

.trust-banner .container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 60px;
    flex-wrap: wrap;
}

.trust-item {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--philips-gray-500);
    font-size: 14px;
    font-weight: 500;
}

.trust-icon {
    width: 44px;
    height: 44px;
    background: white;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    box-shadow: var(--shadow-sm);
}

/* ==================== 5. Section - 通用区块 ==================== */
.section {
    padding: 100px 0;
}

.section-header {
    max-width: 640px;
    margin: 0 auto 56px;
    text-align: center;
}

.section-header.left {
    text-align: left;
    margin: 0 0 56px;
}

.section-eyebrow {
    display: inline-block;
    color: var(--philips-blue);
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 12px;
}

.section-tag {
    display: inline-block;
    background: rgba(0, 85, 184, 0.08);
    color: var(--philips-blue);
    padding: 4px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-title {
    font-size: 38px;
    font-weight: 700;
    color: var(--philips-gray-900);
    line-height: 1.25;
    margin-bottom: 16px;
}

.section-desc {
    font-size: 17px;
    color: var(--philips-gray-500);
    line-height: 1.7;
}

.section-divider {
    width: 56px;
    height: 4px;
    background: var(--philips-gradient);
    border-radius: 4px;
    margin: 20px auto 0;
}

.section-header.left .section-divider {
    margin: 20px 0 0;
}

.section-header.light .section-tag {
    background: rgba(255, 255, 255, 0.1);
    color: var(--philips-cyan);
}

.section-header.light .section-title {
    color: white;
}

.section-header.light .section-desc {
    color: rgba(255, 255, 255, 0.7);
}

/* ==================== 6. Services - 服务卡片 ==================== */
.services {
    background: white;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: white;
    border: 1px solid #E5E7EB;
    border-radius: var(--radius-lg);
    padding: 36px 32px;
    transition: all 0.35s ease;
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--philips-gradient);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.35s;
}

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

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

.service-card-icon,
.service-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, rgba(0, 85, 184, 0.08), rgba(10, 190, 204, 0.08));
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    margin-bottom: 22px;
    color: var(--philips-blue);
}

.service-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--philips-gray-900);
    margin-bottom: 10px;
}

.service-card p {
    font-size: 14.5px;
    color: var(--philips-gray-500);
    line-height: 1.7;
    margin-bottom: 18px;
}

.service-card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--philips-blue);
    font-size: 14px;
    font-weight: 600;
    transition: gap 0.3s;
}

.service-card:hover .service-card-link {
    gap: 10px;
}

.service-card-link svg {
    width: 16px;
    height: 16px;
    transition: transform 0.3s;
}

.service-card:hover .service-card-link svg {
    transform: translateX(3px);
}

/* Service List with cyan checkmarks */
.service-list {
    margin-top: 16px;
}

.service-list li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 8px;
    font-size: 14px;
    color: var(--philips-gray-500);
}

.service-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 6px;
    height: 6px;
    background: var(--philips-cyan);
    border-radius: 50%;
}

/* Service Tab Buttons (pill style) */
.service-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 48px;
    background: white;
    display: inline-flex;
    padding: 4px;
    border-radius: 30px;
    box-shadow: var(--shadow-sm);
    margin-left: auto;
    margin-right: auto;
    left: 50%;
    position: relative;
    transform: translateX(-50%);
}

.tab-btn {
    padding: 10px 28px;
    border-radius: 26px;
    border: none;
    background: transparent;
    font-size: 14.5px;
    font-weight: 600;
    color: var(--philips-gray-500);
    cursor: pointer;
    transition: all 0.3s;
    font-family: inherit;
}

.tab-btn.active {
    background: var(--philips-blue);
    color: white;
    box-shadow: var(--shadow-blue);
}

.tab-btn:not(.active):hover {
    color: var(--philips-blue);
    background: var(--philips-gray-100);
}

/* Service Tab Content */
.service-tab-content {
    display: none;
}

.service-tab-content.active {
    display: block;
}

/* ==================== 7. Products - 产品区域 ==================== */
.products {
    background: var(--philips-gray-100);
}

.product-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 48px;
    background: white;
    display: inline-flex;
    padding: 4px;
    border-radius: 30px;
    box-shadow: var(--shadow-sm);
    margin-left: auto;
    margin-right: auto;
    left: 50%;
    position: relative;
    transform: translateX(-50%);
}

.product-tabs-center {
    text-align: center;
}

.product-tab {
    padding: 10px 28px;
    border-radius: 26px;
    border: none;
    background: transparent;
    font-size: 14.5px;
    font-weight: 600;
    color: var(--philips-gray-500);
    cursor: pointer;
    transition: all 0.3s;
    font-family: inherit;
}

.product-tab.active {
    background: var(--philips-blue);
    color: white;
    box-shadow: var(--shadow-blue);
}

.product-tab:not(.active):hover {
    color: var(--philips-blue);
    background: var(--philips-gray-100);
}

.product-tab-content {
    display: none;
}

.product-tab-content.active {
    display: block;
}

.product-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    background: white;
    border-radius: var(--radius-xl);
    padding: 48px;
    box-shadow: var(--shadow-md);
    align-items: center;
}

.product-badge {
    display: inline-block;
    background: rgba(0, 85, 184, 0.08);
    color: var(--philips-blue);
    padding: 4px 14px;
    border-radius: 16px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.product-info h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--philips-gray-900);
    margin-bottom: 16px;
    line-height: 1.3;
    white-space: nowrap;
}

.product-info > p,
.product-desc {
    font-size: 15px;
    color: var(--philips-gray-500);
    line-height: 1.8;
    margin-bottom: 28px;
}

.product-features {
    display: flex;
    flex-direction: column;
    gap: 18px;
    margin-bottom: 28px;
}

.product-feature {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.product-feature .feature-icon {
    width: 36px;
    height: 36px;
    min-width: 36px;
    background: var(--philips-blue);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 16px;
}

.product-feature h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--philips-gray-900);
    margin-bottom: 2px;
}

.product-feature p {
    font-size: 13.5px;
    color: var(--philips-gray-500);
    line-height: 1.5;
}

.product-image {
    display: flex;
    flex-direction: column;
}

.product-img-gallery {
    display: flex;
    flex-direction: column;
}

.product-img-main {
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: 14px;
    box-shadow: var(--shadow-md);
}

.product-img-main img,
.product-img {
    width: 100%;
    height: auto;
    max-height: 360px;
    object-fit: contain;
    background: var(--philips-gray-100);
    transition: transform 0.5s;
}

.product-img-main:hover img {
    transform: scale(1.03);
}

.product-img-thumbs {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.thumb {
    width: 76px;
    height: 56px;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.3s;
    opacity: 0.6;
}

.thumb img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: var(--philips-gray-100);
}

.thumb:hover,
.thumb.active {
    border-color: var(--philips-blue);
    opacity: 1;
    box-shadow: var(--shadow-blue);
}

/* ==================== 8. Endoscope Models - 内镜型号 ==================== */
.endoscope-models {
    margin-top: 48px;
    padding: 32px;
    background: var(--philips-gray-100);
    border-radius: var(--radius-lg);
}

.endoscope-models h4 {
    font-size: 20px;
    font-weight: 700;
    color: var(--philips-gray-900);
    margin-bottom: 24px;
    text-align: center;
}

.model-categories {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.model-category {
    background: white;
    padding: 24px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.model-category h5 {
    font-size: 16px;
    font-weight: 700;
    color: var(--philips-blue);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--philips-cyan);
}

.model-category ul {
    list-style: none;
}

.model-category li {
    padding: 8px 0;
    font-size: 14px;
    color: var(--philips-gray-700);
    border-bottom: 1px solid var(--philips-gray-100);
}

.model-category li:last-child {
    border-bottom: none;
}

/* ==================== 9. Cases - 案例区域 ==================== */
.cases {
    background: white;
}

.case-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 48px;
    background: white;
    display: inline-flex;
    padding: 4px;
    border-radius: 30px;
    box-shadow: var(--shadow-sm);
    margin-left: auto;
    margin-right: auto;
    left: 50%;
    position: relative;
    transform: translateX(-50%);
}

.case-tab {
    padding: 10px 28px;
    border-radius: 26px;
    border: none;
    background: transparent;
    font-size: 14.5px;
    font-weight: 600;
    color: var(--philips-gray-500);
    cursor: pointer;
    transition: all 0.3s;
    font-family: inherit;
}

.case-tab.active {
    background: var(--philips-blue);
    color: white;
    box-shadow: var(--shadow-blue);
}

.case-tab:not(.active):hover {
    color: var(--philips-blue);
    background: var(--philips-gray-100);
}

.cases-grid,
.case-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.case-card {
    background: white;
    border: 1px solid #E5E7EB;
    border-radius: var(--radius-lg);
    padding: 36px;
    transition: all 0.35s;
    position: relative;
}

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

.case-badge {
    display: inline-block;
    background: rgba(10, 190, 204, 0.1);
    color: var(--philips-teal);
    padding: 4px 14px;
    border-radius: 16px;
    font-size: 12px;
    font-weight: 700;
    margin-bottom: 18px;
}

.case-icon {
    font-size: 32px;
    margin-bottom: 16px;
}

.case-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--philips-gray-900);
    margin-bottom: 10px;
}

.case-card p {
    font-size: 14.5px;
    color: var(--philips-gray-500);
    line-height: 1.7;
    margin-bottom: 18px;
}

.case-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.case-tags span {
    background: var(--philips-gray-100);
    color: var(--philips-gray-500);
    padding: 4px 12px;
    border-radius: 14px;
    font-size: 12px;
    font-weight: 500;
}

/* ==================== 10. About - 关于我们（深色背景） ==================== */
.about {
    background: var(--philips-bg-dark);
    color: white;
    position: relative;
    overflow: hidden;
}

.about::before {
    content: '';
    position: absolute;
    top: -200px;
    right: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 85, 184, 0.2), transparent 70%);
    border-radius: 50%;
}

.about .section-header .section-tag {
    background: rgba(10, 190, 204, 0.15);
    color: var(--philips-cyan);
}

.about .section-title {
    color: white;
}

.about .section-desc {
    color: rgba(255, 255, 255, 0.6);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr;
    max-width: 800px;
    margin: 0 auto;
}

.about-content h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 20px;
    color: white;
}

.about-content > p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin-bottom: 20px;
    font-size: 15.5px;
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 28px;
}

.about-feature {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.about-feature .feature-icon {
    width: 44px;
    height: 44px;
    min-width: 44px;
    background: rgba(10, 190, 204, 0.15);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--philips-cyan);
    font-size: 20px;
}

.about-feature h4 {
    font-size: 16px;
    font-weight: 600;
    color: white;
    margin-bottom: 4px;
}

.about-feature p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.5;
}

/* about-visual removed */

.about .section-eyebrow {
    color: var(--philips-cyan);
}

.about-content > p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin-bottom: 16px;
    font-size: 15px;
}

.about-features {
    margin-top: 28px;
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.about-feature {
    display: flex;
    align-items: flex-start;
    gap: 14px;
}

.about-feature .feature-icon {
    width: 36px;
    height: 36px;
    min-width: 36px;
    background: rgba(10, 190, 204, 0.15);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--philips-cyan);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
    margin-top: 28px;
}

.about-stat {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-md);
    padding: 20px;
}

.about-stat h4 {
    font-size: 30px;
    font-weight: 900;
    color: var(--philips-cyan);
    line-height: 1;
    margin-bottom: 4px;
}

.about-stat p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 13px;
}

/* ==================== 11. Advantages - 优势区域（浅灰背景+白色卡片） ==================== */
.advantages {
    background: var(--philips-gray-100);
}

.advantages .section-title {
    color: var(--philips-gray-900);
}

.adv-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.adv-card {
    background: white;
    border: 1px solid #E5E7EB;
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all 0.35s;
    position: relative;
}

.adv-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: transparent;
}

.adv-number {
    font-size: 48px;
    font-weight: 900;
    color: rgba(0, 85, 184, 0.08);
    line-height: 1;
    margin-bottom: 16px;
    position: absolute;
    top: 20px;
    right: 24px;
}

.adv-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--philips-gray-900);
    margin-bottom: 10px;
    position: relative;
    padding-left: 16px;
}

.adv-card h3::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 20px;
    background: var(--philips-gradient);
    border-radius: 4px;
}

.adv-card p {
    font-size: 14px;
    color: var(--philips-gray-500);
    line-height: 1.7;
}

/* ==================== 12. Repair Gallery - 维修画廊（6列网格） ==================== */
.repair-cases {
    background: white;
}

.repair-gallery {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 10px;
}

.repair-item {
    border-radius: var(--radius-sm);
    overflow: hidden;
    position: relative;
    cursor: pointer;
    aspect-ratio: 1;
}

.repair-item img,
.repair-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}

.repair-item:hover img {
    transform: scale(1.08);
}

.repair-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 30%, rgba(0, 85, 184, 0.85) 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    padding: 12px 8px;
    opacity: 0;
    transition: opacity 0.35s;
}

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

.repair-overlay p {
    color: white;
    font-size: 11px;
    font-weight: 600;
    text-align: center;
}

.repair-icon {
    font-size: 18px;
    margin-bottom: 4px;
}

/* ==================== 13. Contact - 联系区域 ==================== */
.contact {
    background: white;
    border-top: 1px solid #E5E7EB;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    padding-right: 20px;
}

.contact-info > h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--philips-gray-900);
    margin-bottom: 12px;
}

.contact-info > p {
    color: var(--philips-gray-500);
    font-size: 15px;
    margin-bottom: 32px;
}

.contact-item {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    align-items: flex-start;
}

.contact-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    background: linear-gradient(135deg, rgba(0, 85, 184, 0.08), rgba(10, 190, 204, 0.08));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.contact-item h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--philips-gray-900);
    margin-bottom: 2px;
}

.contact-item p {
    font-size: 14px;
    color: var(--philips-gray-500);
}

.contact-link {
    color: var(--philips-blue);
    font-weight: 500;
}

.contact-note {
    font-size: 12.5px;
    color: var(--philips-gray-300);
    margin-top: 2px;
}

.contact-form-wrapper {
    background: var(--philips-gray-100);
    border-radius: var(--radius-xl);
    padding: 40px;
}

.contact-form-wrapper h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--philips-gray-900);
    margin-bottom: 24px;
}

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

.form-group {
    margin-bottom: 0;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 13px 18px;
    border: 1.5px solid #D1D5DB;
    border-radius: var(--radius-sm);
    font-size: 14.5px;
    font-family: inherit;
    transition: all 0.3s;
    background: white;
    color: var(--philips-gray-900);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--philips-blue);
    box-shadow: var(--shadow-blue-focus);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: #9CA3AF;
}

.form-group textarea {
    resize: vertical;
    min-height: 110px;
}

/* ==================== 14. CTA Banner - CTA横幅 ==================== */
.cta-banner {
    background: var(--philips-gradient);
    padding: 72px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 50%, rgba(10, 190, 204, 0.2), transparent 60%);
}

.cta-banner h2 {
    font-size: 36px;
    font-weight: 700;
    color: white;
    margin-bottom: 14px;
    position: relative;
}

.cta-banner p {
    font-size: 17px;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 32px;
    position: relative;
}

.cta-banner .btn {
    position: relative;
}

/* ==================== 15. Footer - 页脚（深色） ==================== */
.footer {
    background: var(--philips-gray-900);
    color: rgba(255, 255, 255, 0.7);
    padding: 64px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.2fr;
    gap: 40px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand h3 {
    font-size: 20px;
    font-weight: 700;
    color: white;
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-logo-mark {
    width: 28px;
    height: 28px;
    background: var(--philips-gradient);
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 12px;
    font-weight: 900;
}

.footer-brand p {
    font-size: 13.5px;
    line-height: 1.7;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 14px;
    font-weight: 700;
    color: white;
    margin-bottom: 18px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-links ul {
    list-style: none;
}

.footer-links li,
.footer-contact p {
    padding: 5px 0;
    font-size: 13.5px;
    color: rgba(255, 255, 255, 0.55);
    transition: color 0.3s;
}

.footer-links a:hover,
.footer-link:hover {
    color: white;
}

.footer-bottom {
    padding: 24px 0;
    text-align: center;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.35);
}

/* ==================== 16. Back to Top - 返回顶部 ==================== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    background: var(--philips-blue);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    box-shadow: var(--shadow-blue);
    transition: all 0.3s;
    opacity: 0;
    pointer-events: none;
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top.visible {
    opacity: 1;
    pointer-events: auto;
}

.back-to-top:hover {
    background: var(--philips-blue-dark);
    transform: translateY(-2px);
}

/* ==================== 17. Lightbox - 灯箱 ==================== */
.lightbox {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.9);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.lightbox.active {
    display: flex;
}

.lightbox-content {
    position: relative;
    max-width: 90%;
    max-height: 90%;
}

.lightbox-content img {
    max-width: 100%;
    max-height: 80vh;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.lightbox-close {
    position: absolute;
    top: -40px;
    right: 0;
    background: transparent;
    border: none;
    color: white;
    font-size: 32px;
    cursor: pointer;
    padding: 8px;
    line-height: 1;
}

.lightbox-close:hover {
    color: var(--philips-cyan);
}

.lightbox-prev,
.lightbox-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
    padding: 16px 12px;
    border-radius: 8px;
    transition: background 0.3s;
}

.lightbox-prev {
    left: -60px;
}

.lightbox-next {
    right: -60px;
}

.lightbox-prev:hover,
.lightbox-next:hover {
    background: rgba(255, 255, 255, 0.2);
}

.lightbox-caption {
    text-align: center;
    color: rgba(255, 255, 255, 0.8);
    margin-top: 16px;
    font-size: 14px;
}

/* ==================== 18. Animations - 滚动动画 ==================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

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

.animate {
    animation: fadeInUp 0.7s ease-out forwards;
}

/* ==================== Responsive Design ==================== */

/* Tablet: 1024px */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        padding: 60px 32px;
    }

    .hero-visual {
        max-width: 400px;
        margin: 0 auto;
    }

    .hero-title {
        font-size: 42px;
    }

    .product-showcase {
        grid-template-columns: 1fr;
        padding: 28px;
    }

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

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

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

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }

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

    .hero-stats {
        justify-content: center;
        max-width: 400px;
    }

    .repair-gallery {
        grid-template-columns: repeat(5, 1fr);
    }
}

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

    .nav-container {
        padding: 0 20px;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 68px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 24px;
        gap: 4px;
        border-bottom: 1px solid var(--philips-gray-100);
        box-shadow: var(--shadow-md);
        transform: translateY(-120%);
        opacity: 0;
        pointer-events: none;
        transition: all 0.35s ease;
        z-index: 999;
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-menu .nav-link {
        padding: 12px 16px;
        border-radius: var(--radius-sm);
        font-size: 15px;
    }

    .nav-menu .nav-link:hover,
    .nav-menu .nav-link.active {
        background: var(--philips-gray-100);
        color: var(--philips-blue);
    }

    .nav-menu .nav-cta {
        text-align: center;
        margin-left: 0;
        margin-top: 8px;
    }

    .hero {
        min-height: 560px;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-content {
        padding: 48px 20px;
        gap: 40px;
    }

    .hero-visual {
        display: none;
    }

    .hero-stats {
        justify-content: space-around;
    }

    .stat-item {
        align-items: center;
    }

    .stat-number {
        font-size: 32px;
    }

    .services-grid,
    .cases-grid,
    .case-grid {
        grid-template-columns: 1fr;
    }

    .repair-gallery {
        grid-template-columns: repeat(4, 1fr);
    }

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

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .section {
        padding: 64px 0;
    }

    .section-title {
        font-size: 28px;
    }

    .section-header {
        margin-bottom: 40px;
    }

    .product-tabs,
    .service-tabs,
    .case-tabs {
        flex-direction: column;
        width: 100%;
        max-width: 300px;
    }

    .tab-btn,
    .product-tab,
    .case-tab {
        width: 100%;
        text-align: center;
    }

    .model-categories {
        grid-template-columns: 1fr;
    }

    .trust-banner .container {
        gap: 24px;
    }

    .product-showcase {
        padding: 20px;
    }

    .product-info h3 {
        font-size: 24px;
    }

    .contact-form-wrapper {
        padding: 24px;
    }

    .cta-banner h2 {
        font-size: 28px;
    }

    .cta-banner {
        padding: 48px 0;
    }

    .lightbox-prev {
        left: 10px;
    }

    .lightbox-next {
        right: 10px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .hero-buttons .btn {
        width: 100%;
        justify-content: center;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }

    .section-title {
        font-size: 24px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 16px;
    }

    .stat-item {
        flex-direction: row;
        align-items: baseline;
        gap: 8px;
    }

    .repair-gallery {
        grid-template-columns: repeat(3, 1fr);
        gap: 8px;
    }

    .product-img-main img,
    .product-img {
        height: auto;
        max-height: 260px;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 40px;
        height: 40px;
    }
}