/**
 * COOLTRUST Website Styles
 * Responsive, Bilingual Support
 */

/* ============================================
   CSS Variables
   ============================================ */
:root {
    --primary-color: #1a3a5c;
    --primary-dark: #0f2538;
    --primary-light: #2a5a8a;
    --accent-color: #c9a227;
    --accent-hover: #b08d1f;
    --text-dark: #1a1a1a;
    --text-light: #666;
    --text-muted: #999;
    --bg-light: #f5f7fa;
    --bg-dark: #0f2538;
    --white: #ffffff;
    --border-color: #e0e4e8;
    --gradient-primary: linear-gradient(135deg, #1a3a5c 0%, #0f2538 100%);
    --gradient-accent: linear-gradient(135deg, #c9a227 0%, #b08d1f 100%);
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.15);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.2);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.section-subtitle {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 3rem;
    font-size: 1.1rem;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    font-size: 0.95rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    gap: 8px;
}

.btn-primary {
    background: var(--gradient-accent);
    color: var(--white);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

.btn-secondary:hover {
    background: var(--white);
    color: var(--primary-color);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: var(--white);
}

.btn-sm {
    padding: 10px 20px;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 16px 40px;
    font-size: 1rem;
}

/* ============================================
   Header & Navigation
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 40px;
    width: auto;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: block;
    padding: 10px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-dark);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.nav-item.active .nav-link {
    color: #22c55e;
}

.nav-item.active .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 16px;
    right: 16px;
    height: 2px;
    background: #22c55e;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.lang-switch {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-light);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

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

/* Mobile Toggle */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

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

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

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

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

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: absolute;
    top: 80px;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: var(--shadow-lg);
    padding: 20px;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

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

.mobile-nav-menu {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mobile-nav-link {
    display: block;
    padding: 12px 16px;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-dark);
    border-radius: var(--radius-sm);
}

.mobile-nav-link:hover {
    background: var(--bg-light);
    color: var(--primary-color);
}

.mobile-nav-item.active .mobile-nav-link {
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
}

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

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-size: cover;
    background-position: center;
}

/* 有背景图片时的样式 */
.hero-bg[style*="background-image"] {
    opacity: 1;
}

/* 没有背景图片时的样式（使用渐变背景） */
.hero-bg:not([style*="background-image"]) {
    opacity: 0.3;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(26, 58, 92, 0.9) 0%, rgba(15, 37, 56, 0.8) 100%);
}

/* Hero标题无阴影 */

.hero-content {
    position: relative;
    z-index: 2;
    padding: 120px 0 80px;
    text-align: left;
    max-width: 700px;
    margin-left: 0;
    margin-right: auto;
}

.hero-label {
    display: inline-block;
    padding: 8px 16px;
    background: var(--accent-color);
    color: var(--white);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: var(--radius-sm);
    margin-bottom: 24px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    color: #a3d900;
    margin-bottom: 20px;
    line-height: 1.1;
    text-align: left;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 32px;
    font-weight: 400;
    text-align: left;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: flex-start;
}

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

.section-light {
    background: var(--white);
}

.section-dark {
    background: var(--gradient-primary);
    color: var(--white);
}

.section-dark .section-title,
.section-dark .section-subtitle {
    color: var(--white);
}

/* Service Overview with Background Image */
.service-overview-with-bg {
    background: transparent;
    color: var(--white);
}

.service-overview-with-bg .section-title,
.service-overview-with-bg .section-subtitle {
    color: var(--white);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

/* ============================================
   Core Values Section
   ============================================ */
.values-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
    margin-top: 50px;
}

.value-card {
    position: relative;
    width: 200px;
    height: 300px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    margin: 0 auto;
}

.value-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.value-image {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.value-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.value-card:hover .value-image img {
    transform: scale(1.05);
}

.value-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 15px;
    background: linear-gradient(to top, rgba(26, 58, 92, 0.98) 0%, rgba(26, 58, 92, 0.7) 60%, transparent 100%);
    min-height: 130px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

.value-title {
    font-size: 1.1rem;
    color: var(--white);
    margin-bottom: 4px;
    line-height: 1.3;
}

.value-subtitle {
    font-size: 0.75rem;
    color: var(--accent-color);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
    line-height: 1.3;
}

.value-desc {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.85);
    margin: 0;
    line-height: 1.5;
}

/* ============================================
   Services Section
   ============================================ */
.services-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
    margin-top: 50px;
}

.service-card {
    position: relative;
    width: 300px;
    height: 593px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    margin: 0 auto;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.service-image {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.service-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.service-card:hover .service-image img {
    transform: scale(1.05);
}

.service-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 20px;
    background: linear-gradient(to top, rgba(255, 255, 255, 0.98) 0%, rgba(255, 255, 255, 0.9) 60%, transparent 100%);
    min-height: 180px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

.service-title {
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-bottom: 6px;
    line-height: 1.4;
}

.service-subtitle {
    font-size: 0.75rem;
    color: var(--accent-color);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
    line-height: 1.3;
}

.service-desc {
    font-size: 0.8rem;
    color: var(--text-light);
    margin-bottom: 12px;
    line-height: 1.5;
}

/* ============================================
   富文本编辑器内容统一字体大小
   ============================================ */

/* 所有富文本容器统一设置 */
.service-desc,
.value-desc,
.welcome-desc,
.faq-answer,
.tech-project-desc,
.list-item-content {
    font-size: 0.8rem;
    line-height: 1.6;
}

/* 强制所有子元素使用相同字体大小 - 使用更高优先级 */
.service-desc *,
.value-desc *,
.welcome-desc *,
.faq-answer *,
.tech-project-desc *,
.list-item-content *,
.service-desc *::before,
.service-desc *::after,
.value-desc *::before,
.value-desc *::after,
.welcome-desc *::before,
.welcome-desc *::after,
.faq-answer *::before,
.faq-answer *::after,
.tech-project-desc *::before,
.tech-project-desc *::after,
.list-item-content *::before,
.list-item-content *::after {
    font-size: inherit !important;
    line-height: inherit !important;
}

/* 加粗标签只改变字重，不改变大小 */
.service-desc strong,
.service-desc b,
.value-desc strong,
.value-desc b,
.welcome-desc strong,
.welcome-desc b,
.faq-answer strong,
.faq-answer b,
.tech-project-desc strong,
.tech-project-desc b,
.list-item-content strong,
.list-item-content b {
    font-weight: 700 !important;
    font-size: inherit !important;
    line-height: inherit !important;
}

/* 斜体标签 */
.service-desc em,
.service-desc i,
.value-desc em,
.value-desc i,
.welcome-desc em,
.welcome-desc i,
.faq-answer em,
.faq-answer i,
.tech-project-desc em,
.tech-project-desc i,
.list-item-content em,
.list-item-content i {
    font-style: italic !important;
    font-size: inherit !important;
    line-height: inherit !important;
}

/* 下划线标签 */
.service-desc u,
.value-desc u,
.welcome-desc u,
.faq-answer u,
.tech-project-desc u,
.list-item-content u {
    text-decoration: underline !important;
    font-size: inherit !important;
    line-height: inherit !important;
}

/* span标签完全继承 */
.service-desc span,
.value-desc span,
.welcome-desc span,
.faq-answer span,
.tech-project-desc span,
.list-item-content span {
    font-size: inherit !important;
    line-height: inherit !important;
}

/* 段落标签 */
.service-desc p,
.value-desc p,
.welcome-desc p,
.faq-answer p,
.tech-project-desc p,
.list-item-content p {
    font-size: inherit !important;
    line-height: inherit !important;
    margin: 0 0 0.5em 0;
}

/* 标题标签在富文本中统一大小 */
.service-desc h1,
.service-desc h2,
.service-desc h3,
.service-desc h4,
.service-desc h5,
.service-desc h6,
.value-desc h1,
.value-desc h2,
.value-desc h3,
.value-desc h4,
.value-desc h5,
.value-desc h6,
.welcome-desc h1,
.welcome-desc h2,
.welcome-desc h3,
.welcome-desc h4,
.welcome-desc h5,
.welcome-desc h6,
.faq-answer h1,
.faq-answer h2,
.faq-answer h3,
.faq-answer h4,
.faq-answer h5,
.faq-answer h6 {
    font-size: inherit !important;
    font-weight: 700 !important;
    line-height: inherit !important;
    margin: 0 0 0.5em 0;
}

/* div标签 */
.service-desc div,
.value-desc div,
.welcome-desc div,
.faq-answer div,
.tech-project-desc div,
.list-item-content div {
    font-size: inherit !important;
    line-height: inherit !important;
}

/* font标签 */
.service-desc font,
.value-desc font,
.welcome-desc font,
.faq-answer font,
.tech-project-desc font,
.list-item-content font {
    font-size: inherit !important;
    line-height: inherit !important;
}

.service-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.85rem;
}

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

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
    padding: 80px 20px;
    background: linear-gradient(135deg, #1a3a5c 0%, #2a5a8a 100%);
    max-width: 1200px;
    margin: 0 auto;
    border-radius: 12px;
}

.cta-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.cta-card {
    display: flex;
    align-items: center;
    gap: 30px;
    padding: 40px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition);
}

.cta-card:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-4px);
}

.cta-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-color);
    border-radius: 50%;
    font-size: 2rem;
    color: var(--white);
    flex-shrink: 0;
}

.cta-content h3 {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.cta-content h4 {
    font-size: 1.5rem;
    color: var(--white);
    margin-bottom: 12px;
}

.cta-content p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 20px;
}

/* ============================================
   Welcome Section (WE LOOK FORWARD TO WELCOMING YOU!)
   ============================================ */
.section-welcome {
    padding: 100px 0 80px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.section-welcome .section-title {
    color: var(--primary-color);
    font-size: 1.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.section-welcome .section-subtitle {
    color: var(--text-light);
    font-size: 1rem;
    margin-bottom: 40px;
}

/* Welcome Section with Background Image */
.welcome-with-bg {
    padding: 80px 0;
    background: transparent;
}

.welcome-with-bg .section-title {
    color: var(--primary-color);
    font-size: 1.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
    text-shadow: 0 2px 4px rgba(255, 255, 255, 0.8);
}

.welcome-with-bg .section-subtitle {
    color: var(--text-dark);
    font-size: 1rem;
    margin-bottom: 40px;
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.8);
}

.welcome-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-top: 40px;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.welcome-card {
    display: flex;
    align-items: flex-end;
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: visible;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 2px solid transparent;
    position: relative;
    max-height: 220px;
}

.welcome-card-reverse {
    flex-direction: row-reverse;
}

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

.welcome-person-image {
    flex: 0 0 40%;
    height: 280px;
    position: relative;
    overflow: visible;
    margin: -60px 0 0 0;
    z-index: 2;
    display: flex;
    align-items: flex-end;
}

.welcome-person-image img {
    width: 100%;
    height: 100%;
    max-height: 280px;
    object-fit: contain;
    object-position: bottom center;
}

.welcome-content {
    flex: 1;
    padding: 20px 24px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-width: 0;
}

.welcome-title {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
    line-height: 1.3;
}

.welcome-subtitle {
    font-size: 1rem;
    color: var(--accent-color);
    font-weight: 700;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    line-height: 1.3;
}

.welcome-desc {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 16px;
    line-height: 1.6;
}

.welcome-content .btn {
    align-self: flex-start;
    padding: 8px 20px;
    font-size: 0.8rem;
    white-space: nowrap;
}

/* ============================================
   FAQ Section
   ============================================ */
.faq-section {
    padding: 100px 0;
    background: var(--bg-light);
}

/* FAQ Section with Background Image */
.faq-with-bg {
    background: transparent;
}

.faq-with-bg .section-title {
    color: var(--primary-color);
    text-shadow: 0 2px 4px rgba(255, 255, 255, 0.8);
}

.faq-with-bg .section-subtitle {
    color: var(--text-light);
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.8);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 50px;
}

.faq-card {
    background: var(--white);
    padding: 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.faq-card:hover {
    box-shadow: var(--shadow-md);
}

.faq-question {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 16px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--accent-color);
}

.faq-answer {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.7;
}

.faq-view-more {
    text-align: center;
    margin-top: 40px;
}

/* ============================================
   Services Detail Page
   ============================================ */
.service-detail {
    padding: 120px 0 80px;
}

.service-hero {
    background: var(--gradient-primary);
    padding: 120px 0 80px;
    color: var(--white);
    text-align: center;
}

.service-hero h1 {
    font-size: 3rem;
    margin-bottom: 16px;
}

.service-hero p {
    font-size: 1.2rem;
    opacity: 0.8;
    max-width: 700px;
    margin: 0 auto;
}

.service-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
}

.service-detail-grid.reverse {
    direction: rtl;
}

.service-detail-grid.reverse > * {
    direction: ltr;
}

.service-detail-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.service-detail-image img {
    width: 100%;
    height: 400px;
    object-fit: cover;
}

.service-detail-content h2 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.service-detail-content p {
    color: var(--text-light);
    margin-bottom: 24px;
}

.service-features-list {
    display: grid;
    gap: 16px;
}

.service-feature-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 16px;
    background: var(--bg-light);
    border-radius: var(--radius-md);
}

.service-feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-color);
    color: var(--white);
    border-radius: var(--radius-sm);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.service-feature-text h4 {
    font-size: 1rem;
    color: var(--primary-color);
    margin-bottom: 4px;
}

.service-feature-text p {
    font-size: 0.9rem;
    color: var(--text-light);
    margin: 0;
}

/* ============================================
   Case Studies Page
   ============================================ */
.case-studies-hero {
    background: var(--gradient-primary);
    padding: 140px 0 80px;
    color: var(--white);
    text-align: center;
}

.case-studies-hero h1 {
    font-size: 3rem;
    margin-bottom: 16px;
}

.case-study-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    margin-bottom: 60px;
}

.case-study-header {
    background: var(--primary-color);
    color: var(--white);
    padding: 30px 40px;
}

.case-study-header h3 {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.case-study-header p {
    opacity: 0.8;
    margin: 0;
}

.case-study-content {
    padding: 40px;
}

.case-study-section {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 40px;
    margin-bottom: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--border-color);
}

.case-study-section:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.case-study-image {
    border-radius: var(--radius-md);
    overflow: hidden;
}

.case-study-image img {
    width: 100%;
    height: 150px;
    object-fit: cover;
}

.case-study-text h4 {
    font-size: 0.9rem;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.case-study-text p {
    color: var(--text-light);
    margin: 0;
}

/* ============================================
   Why Cooltrust Page
   ============================================ */
.differentiation-section {
    padding: 80px 0;
}

.differentiation-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
    padding: 60px;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.differentiation-card:nth-child(even) {
    direction: rtl;
}

.differentiation-card:nth-child(even) > * {
    direction: ltr;
}

.differentiation-card:last-child {
    margin-bottom: 0;
}

.differentiation-image {
    border-radius: var(--radius-md);
    overflow: hidden;
}

.differentiation-image img {
    width: 100%;
    height: 350px;
    object-fit: cover;
}

.differentiation-content h3 {
    font-size: 0.9rem;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.differentiation-content h2 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.differentiation-content p {
    color: var(--text-light);
    font-size: 1.1rem;
    line-height: 1.8;
}

/* Value Display Grid */
.value-display-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-top: 60px;
}

.value-display-card {
    text-align: center;
    padding: 40px 24px;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.value-display-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-light);
    color: var(--primary-color);
    border-radius: 50%;
    font-size: 1.75rem;
    margin: 0 auto 20px;
}

.value-display-card h4 {
    font-size: 1rem;
    color: var(--primary-color);
    margin-bottom: 12px;
}

.value-display-card p {
    font-size: 0.9rem;
    color: var(--text-light);
    margin: 0;
}

/* ============================================
   Partners Page
   ============================================ */
.partners-hero {
    background: var(--gradient-primary);
    padding: 140px 0 80px;
    color: var(--white);
    text-align: center;
}

.partners-hero h1 {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.partners-hero p {
    font-size: 1.1rem;
    opacity: 0.8;
    max-width: 800px;
    margin: 0 auto 30px;
}

.what-we-provide {
    padding: 80px 0;
    background: var(--bg-light);
}

.provide-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-top: 50px;
}

.provide-card {
    display: flex;
    gap: 24px;
    padding: 30px;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.provide-card:hover {
    box-shadow: var(--shadow-md);
}

.provide-number {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-color);
    color: var(--white);
    font-size: 1.25rem;
    font-weight: 700;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.provide-content h3 {
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.provide-content p {
    font-size: 0.95rem;
    color: var(--text-light);
    margin: 0;
}

/* Expectations */
.expectations-section {
    padding: 80px 0;
}

.expectations-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 50px;
}

.expectation-card {
    text-align: center;
    padding: 40px 30px;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border-top: 4px solid var(--accent-color);
}

.expectation-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-light);
    color: var(--primary-color);
    border-radius: 50%;
    font-size: 2rem;
    margin: 0 auto 24px;
}

.expectation-card h3 {
    font-size: 1.25rem;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.expectation-card p {
    font-size: 0.95rem;
    color: var(--text-light);
    margin: 0;
}

/* Cooperation Models */
.cooperation-section {
    padding: 80px 0;
    background: var(--bg-light);
}

.cooperation-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 50px;
}

.cooperation-card {
    padding: 40px 30px;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cooperation-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-accent);
}

.cooperation-phase {
    display: inline-block;
    padding: 6px 16px;
    background: var(--accent-color);
    color: var(--white);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
}

.cooperation-card h3 {
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.cooperation-card p {
    font-size: 0.95rem;
    color: var(--text-light);
    margin: 0;
}

/* ============================================
   Contact Page
   ============================================ */
.contact-hero {
    background: var(--gradient-primary);
    padding: 140px 0 80px;
    color: var(--white);
    text-align: center;
}

.contact-hero h1 {
    font-size: 3rem;
    margin-bottom: 16px;
}

.contact-hero p {
    font-size: 1.2rem;
    opacity: 0.8;
    max-width: 600px;
    margin: 0 auto;
}

.contact-section {
    padding: 80px 0;
}

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

.contact-form-wrapper {
    background: var(--white);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.contact-form-wrapper h2 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 30px;
    text-align: center;
}

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

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

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

.form-control {
    width: 100%;
    padding: 14px 16px;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition);
    font-family: inherit;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
}

textarea.form-control {
    min-height: 150px;
    resize: vertical;
}

.contact-info-wrapper {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.contact-info-card {
    background: var(--white);
    padding: 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.contact-info-card h3 {
    font-size: 1.25rem;
    color: var(--primary-color);
    margin-bottom: 24px;
}

.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 20px;
}

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

.contact-info-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-light);
    color: var(--primary-color);
    border-radius: var(--radius-sm);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.contact-info-text h4 {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 4px;
    font-weight: 500;
}

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

.contact-info-text a:hover {
    color: var(--primary-color);
}

/* Response Commitments */
.response-commitments {
    padding: 80px 0;
    background: var(--gradient-primary);
    color: var(--white);
}

.response-commitments .section-title {
    color: var(--white);
}

.response-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 50px;
}

.response-card {
    text-align: center;
    padding: 40px 30px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.response-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-color);
    color: var(--white);
    border-radius: 50%;
    font-size: 2rem;
    margin: 0 auto 24px;
}

.response-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.response-card p {
    opacity: 0.8;
    margin: 0;
}

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

.map-container {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.map-container iframe {
    width: 100%;
    height: 450px;
    border: none;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--bg-dark);
    color: var(--white);
    padding: 80px 0 0;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
    padding-bottom: 60px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

/* Footer Info Lines - 标签和内容在同一行 */
.footer-info-lines {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    text-align: center;
    width: 100%;
}

.footer-info-line {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

.footer-label {
    font-weight: 600;
    color: var(--white);
}

.footer-value {
    color: rgba(255, 255, 255, 0.8);
}

.footer-value a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-social {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.footer-logo {
    display: block;
    text-align: center;
}

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

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 24px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #6366f1;
    color: var(--white);
    border-radius: 50%;
    transition: var(--transition);
    font-size: 1.1rem;
}

.social-link:hover {
    background: var(--accent-color);
    transform: translateY(-3px);
}

.footer-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--white);
}

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

.footer-links ul li a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
    transition: var(--transition);
}

.footer-links ul li a:hover {
    color: var(--accent-color);
    padding-left: 4px;
}

.footer-contact ul li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
}

.footer-contact ul li i {
    color: var(--accent-color);
    margin-top: 4px;
}

.footer-contact ul li a {
    color: rgba(255, 255, 255, 0.7);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-admin a {
    color: rgba(255, 255, 255, 0.5);
}

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

/* ============================================
   Back to Top Button
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-color);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    z-index: 999;
}

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

.back-to-top:hover {
    transform: translateY(-4px);
    background: var(--accent-hover);
}

/* ============================================
   Alert Messages
   ============================================ */
.alert {
    padding: 16px 20px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    font-weight: 500;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* ============================================
   Responsive Styles
   ============================================ */
@media (max-width: 1200px) {
    .container {
        padding: 0 30px;
    }
}

@media (max-width: 992px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-title {
        font-size: 2.75rem;
    }
    
    .values-grid,
    .services-grid {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 25px;
    }
    
    .value-card,
    .service-card {
        width: 270px;
        height: 534px;
    }
    
    .faq-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .value-display-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        gap: 35px;
    }
    
    .service-detail-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .differentiation-card {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .differentiation-card:nth-child(even) {
        direction: ltr;
    }
}

@media (max-width: 768px) {
    .nav-menu,
    .nav-right .btn {
        display: none;
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .mobile-menu {
        display: block;
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .values-grid,
    .services-grid,
    .faq-grid,
    .cta-grid,
    .provide-grid,
    .expectations-grid,
    .cooperation-grid,
    .response-grid {
        grid-template-columns: 1fr;
    }
    
    .value-display-grid {
        grid-template-columns: 1fr;
    }
    
    .value-card,
    .service-card {
        width: 100%;
        max-width: 280px;
        height: auto;
        aspect-ratio: 300 / 593;
    }
    
    .service-content {
        min-height: 150px;
        padding: 15px;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .footer-content {
        gap: 30px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
    
    .case-study-section {
        grid-template-columns: 1fr;
    }
    
    .service-detail-grid.reverse {
        direction: ltr;
    }
    
    .cta-card {
        flex-direction: column;
        text-align: center;
    }
    
    .welcome-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
    }
    
    .welcome-card,
    .welcome-card-reverse {
        flex-direction: column;
        overflow: hidden;
        max-height: none;
        align-items: stretch;
    }
    
    .welcome-person-image {
        flex: 0 0 220px;
        height: 220px;
        margin: -40px 0 0 0;
        overflow: visible;
    }
    
    .welcome-person-image img {
        max-height: 220px;
        object-fit: contain;
        object-position: bottom center;
    }
    
    .welcome-content {
        padding: 20px;
    }
    
    .section-welcome .section-title {
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .btn {
        padding: 12px 24px;
        font-size: 0.85rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .provide-card {
        flex-direction: column;
    }
    
    .contact-form-wrapper,
    .contact-info-card {
        padding: 24px;
    }
}

/* ============================================
   Mobile Responsive Enhancements
   ============================================ */
@media (max-width: 768px) {
    /* Hero Section Mobile */
    .hero {
        min-height: auto;
        padding: 80px 0 60px;
    }
    
    .hero-content {
        padding: 0 15px;
        max-width: 100% !important;
    }
    
    .hero-title {
        font-size: 1.5rem !important;
        line-height: 1.3;
        margin-bottom: 15px;
    }
    
    .hero-subtitle {
        font-size: 1rem !important;
        margin-bottom: 20px;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }
    
    .hero-cta {
        width: 100%;
        justify-content: center;
        padding: 14px 30px;
    }
    
    /* Value Cards Mobile - 由mobile.css处理 */
    .values-grid {
        /* 样式由mobile.css控制 */
    }
    
    .value-card {
        /* 样式由mobile.css控制 */
    }
    
    .value-image {
        /* 样式由mobile.css控制 */
    }
    
    /* Service Cards Mobile - 由mobile.css处理 */
    .services-grid {
        /* 样式由mobile.css控制 */
    }
    
    .service-card {
        /* 样式由mobile.css控制 */
    }
    
    .service-image {
        /* 样式由mobile.css控制 */
    }
    
    /* Welcome Section Mobile */
    .welcome-grid {
        grid-template-columns: 1fr !important;
        gap: 20px;
        padding: 0 15px;
    }
    
    .welcome-card,
    .welcome-card-reverse {
        flex-direction: column !important;
        height: auto !important;
    }
    
    .welcome-person-image {
        width: 100% !important;
        height: 200px !important;
        position: relative !important;
        order: 2 !important;
    }
    
    .welcome-content {
        padding: 20px !important;
        order: 1 !important;
    }
    
    /* FAQ Section Mobile */
    .faq-grid {
        grid-template-columns: 1fr !important;
        gap: 15px;
        padding: 0 15px;
    }
    
    .faq-card {
        padding: 20px !important;
    }
    
    .faq-question {
        font-size: 1rem !important;
    }
    
    .faq-answer {
        font-size: 0.85rem !important;
    }
    
    /* Section Spacing Mobile */
    .section {
        padding: 40px 0 !important;
    }
    
    .section-title {
        font-size: 1.5rem !important;
        margin-bottom: 10px;
        padding: 0 15px;
    }
    
    .section-subtitle {
        font-size: 0.9rem !important;
        padding: 0 15px;
    }
    
    /* Container Mobile */
    .container {
        padding: 0 15px !important;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.25rem !important;
    }
    
    .hero-subtitle {
        font-size: 0.9rem !important;
    }
    
    .section-title {
        font-size: 1.25rem !important;
    }
    
    .value-card,
    .service-card {
        min-height: 450px;
    }
    
    .value-content,
    .service-content {
        padding: 15px !important;
    }
    
    .value-title,
    .service-title {
        font-size: 1.1rem !important;
    }
    
    .value-desc,
    .service-desc {
        font-size: 0.8rem !important;
    }
}