/* ========================================
   东莞市公信价格评估有限公司 - 主样式表
   Modern Responsive Design
   ======================================== */

/* --- CSS Custom Properties --- */
:root {
  /* 品牌色彩 */
  --color-primary: #B71C1C;       /* 中国红 - 主色 */
  --color-primary-dark: #8B0000;  /* 深红 */
  --color-primary-light: #D32F2F; /* 亮红 */
  --color-accent: #C8A96E;        /* 金色 - 点缀 */
  --color-accent-light: #E8D5A8;  /* 浅金 */

  /* 中性色 */
  --color-dark: #1a2332;          /* 深海军蓝 */
  --color-dark-800: #243044;
  --color-dark-700: #2d3a50;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-text-muted: #999999;
  --color-border: #e8e8e8;
  --color-bg: #ffffff;
  --color-bg-light: #f8f9fa;
  --color-bg-warm: #faf8f5;

  /* 字体 */
  --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-size-base: 16px;
  --font-size-sm: 14px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 28px;
  --font-size-3xl: 36px;
  --font-size-4xl: 48px;

  /* 间距 */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
  --spacing-4xl: 96px;

  /* 容器 */
  --container-max: 1200px;
  --container-padding: 20px;

  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);

  /* 过渡 */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Header 高度 */
  --header-height: 80px;
}

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

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
  list-style: none;
}

/* --- Utility Classes --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: var(--spacing-4xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-tag {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: var(--spacing-md);
  position: relative;
  padding: 0 var(--spacing-md);
}

.section-tag::before,
.section-tag::after {
  content: '';
  position: absolute;
  top: 50%;
  width: 30px;
  height: 1px;
  background: var(--color-primary);
}

.section-tag::before {
  left: -30px;
}

.section-tag::after {
  right: -30px;
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: var(--spacing-md);
  letter-spacing: 1px;
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.8;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

/* --- Header & Navigation --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition-base);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

.header.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
}

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

.logo-text .company-name {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.2;
  letter-spacing: 2px;
}

.logo-text .company-slogan {
  font-size: 11px;
  color: var(--color-text-muted);
  letter-spacing: 1px;
}

/* Desktop Navigation */
.nav-desktop {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav-desktop a {
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-text);
  position: relative;
  padding: var(--spacing-sm) 0;
  letter-spacing: 1px;
}

.nav-desktop a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: all var(--transition-base);
  transform: translateX(-50%);
}

.nav-desktop a:hover,
.nav-desktop a.active {
  color: var(--color-primary);
}

.nav-desktop a:hover::after,
.nav-desktop a.active::after {
  width: 100%;
}

.nav-phone {
  display: none;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary);
}

.nav-phone svg {
  width: 18px;
  height: 18px;
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--spacing-sm);
  z-index: 1001;
  background: none;
  border: none;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-dark);
  transition: all var(--transition-base);
  border-radius: 2px;
}

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

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

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

/* Mobile Navigation Overlay */
.nav-mobile-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 998;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.nav-mobile-overlay.active {
  opacity: 1;
}

.nav-mobile {
  display: none;
  position: fixed;
  top: 0;
  right: -300px;
  width: 300px;
  height: 100%;
  background: var(--color-bg);
  z-index: 999;
  padding: calc(var(--header-height) + var(--spacing-xl)) var(--spacing-xl) var(--spacing-xl);
  transition: right var(--transition-base);
  box-shadow: var(--shadow-xl);
  overflow-y: auto;
}

.nav-mobile.active {
  right: 0;
}

.nav-mobile a {
  display: block;
  font-size: var(--font-size-lg);
  font-weight: 500;
  color: var(--color-text);
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-border);
  letter-spacing: 1px;
}

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

.nav-mobile-contact {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-xl);
  border-top: 2px solid var(--color-primary);
}

.nav-mobile-contact p {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xs);
}

.nav-mobile-contact a {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-primary);
  border: none;
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--color-dark) 0%, #2d3a50 50%, #1a2332 100%);
  overflow: hidden;
  padding-top: var(--header-height);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('https://img.wanwang.xin/contents/sitefiles6228/31141834/images/175472174.png') center/cover no-repeat;
  opacity: 0.15;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 120px;
  background: linear-gradient(to top, var(--color-bg), transparent);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  padding: var(--spacing-4xl) 0;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: rgba(183, 28, 28, 0.15);
  border: 1px solid rgba(183, 28, 28, 0.3);
  color: var(--color-accent-light);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 50px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  margin-bottom: var(--spacing-xl);
  letter-spacing: 1px;
}

.hero-badge svg {
  width: 16px;
  height: 16px;
}

.hero h1 {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: #ffffff;
  line-height: 1.3;
  margin-bottom: var(--spacing-lg);
  letter-spacing: 2px;
}

.hero h1 .highlight {
  color: var(--color-accent);
}

.hero p {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.8;
  margin-bottom: var(--spacing-xl);
  max-width: 560px;
}

.hero-values {
  display: flex;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.hero-value {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
}

.hero-value .icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  color: var(--color-accent);
  margin-top: 2px;
}

.hero-value span {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.6;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-base);
  font-weight: 600;
  letter-spacing: 1px;
  cursor: pointer;
  transition: all var(--transition-base);
  border: none;
  text-align: center;
}

.btn-primary {
  background: var(--color-primary);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(183, 28, 28, 0.35);
}

.btn-outline {
  background: transparent;
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.btn-outline:hover {
  border-color: #ffffff;
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

.btn svg {
  width: 18px;
  height: 18px;
}

/* --- Stats Bar --- */
.stats-bar {
  background: var(--color-bg);
  padding: 0;
  margin-top: -60px;
  position: relative;
  z-index: 10;
}

.stats-bar .container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.stat-item {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
  border-right: 1px solid var(--color-border);
  transition: background var(--transition-fast);
}

.stat-item:last-child {
  border-right: none;
}

.stat-item:hover {
  background: var(--color-bg-warm);
}

.stat-number {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: var(--spacing-xs);
}

.stat-number span {
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  letter-spacing: 1px;
}

/* --- Services Section --- */
.services {
  background: var(--color-bg-light);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.service-card {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl) var(--spacing-xl);
  text-align: center;
  transition: all var(--transition-base);
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

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

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

.service-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(183, 28, 28, 0.08), rgba(200, 169, 110, 0.08));
  border-radius: var(--radius-lg);
  color: var(--color-primary);
}

.service-icon svg {
  width: 32px;
  height: 32px;
}

.service-card h3 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: var(--spacing-md);
}

.service-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: 1.8;
}

/* --- Cases / Gallery Section --- */
.cases {
  background: var(--color-bg);
}

.cases-gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.case-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-bg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

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

.case-card img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

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

.case-card .image-wrapper {
  overflow: hidden;
  position: relative;
}

.case-card .image-wrapper::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to bottom, transparent 60%, rgba(0,0,0,0.3));
  pointer-events: none;
}

.certificates-scroll {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.certificate-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  border: 1px solid var(--color-border);
}

.certificate-card:hover {
  transform: scale(1.03);
  box-shadow: var(--shadow-lg);
}

.certificate-card img {
  width: 100%;
  aspect-ratio: 3/4;
  object-fit: cover;
}

/* --- Team Section --- */
.team {
  background: var(--color-dark);
  color: #ffffff;
  position: relative;
  overflow: hidden;
}

.team::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: rgba(183, 28, 28, 0.08);
  pointer-events: none;
}

.team .section-tag {
  color: var(--color-accent);
}

.team .section-tag::before,
.team .section-tag::after {
  background: var(--color-accent);
}

.team .section-title {
  color: #ffffff;
}

.team .section-subtitle {
  color: rgba(255, 255, 255, 0.6);
}

.team-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.team-text p {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.75);
  line-height: 2;
  margin-bottom: var(--spacing-lg);
}

.team-text p strong {
  color: var(--color-accent);
  font-weight: 600;
}

.team-principles {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

.principle-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.principle-item svg {
  width: 24px;
  height: 24px;
  color: var(--color-accent);
  flex-shrink: 0;
}

.principle-item span {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.85);
  font-weight: 500;
}

.team-image {
  position: relative;
}

.team-image img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
}

.team-image-badge {
  position: absolute;
  bottom: -20px;
  right: -20px;
  background: var(--color-primary);
  color: #ffffff;
  padding: var(--spacing-lg) var(--spacing-xl);
  border-radius: var(--radius-md);
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.team-image-badge .number {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  line-height: 1;
}

.team-image-badge .label {
  font-size: var(--font-size-sm);
  opacity: 0.85;
  margin-top: var(--spacing-xs);
}

/* --- Qualifications Section --- */
.qualifications {
  background: var(--color-bg-warm);
}

.qual-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
}

.qual-card {
  text-align: center;
  padding: var(--spacing-xl);
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.qual-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.qual-card img {
  width: 100%;
  aspect-ratio: 3/4;
  object-fit: contain;
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-md);
  background: #fff;
}

.qual-card h4 {
  font-size: var(--font-size-base);
  color: var(--color-dark);
  font-weight: 600;
}

/* --- About Section --- */
.about {
  background: var(--color-bg);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.about-image {
  position: relative;
}

.about-image img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.about-image::after {
  content: '';
  position: absolute;
  top: 20px;
  left: 20px;
  right: -20px;
  bottom: -20px;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  z-index: -1;
}

.about-text h3 {
  font-size: var(--font-size-2xl);
  color: var(--color-dark);
  margin-bottom: var(--spacing-lg);
  font-weight: 700;
}

.about-text p {
  color: var(--color-text-light);
  line-height: 2;
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-base);
}

.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

.about-highlight {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
}

.about-highlight .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
  flex-shrink: 0;
  margin-top: 8px;
}

.about-highlight span {
  font-size: var(--font-size-sm);
  color: var(--color-text);
  line-height: 1.6;
}

/* --- Organization Section --- */
.organization {
  background: var(--color-bg-light);
}

.org-content {
  text-align: center;
}

.org-image-wrapper {
  max-width: 800px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
}

.org-image-wrapper img {
  width: 100%;
  height: auto;
}

/* --- Contact Section --- */
.contact {
  background: var(--color-bg);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
}

.contact-info {
  padding: var(--spacing-2xl);
  background: var(--color-dark);
  border-radius: var(--radius-lg);
  color: #ffffff;
}

.contact-info h3 {
  font-size: var(--font-size-2xl);
  color: #ffffff;
  margin-bottom: var(--spacing-lg);
}

.contact-info p {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.8;
  margin-bottom: var(--spacing-xl);
}

.contact-items {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.contact-item .icon-box {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.contact-item .icon-box svg {
  width: 22px;
  height: 22px;
  color: var(--color-accent);
}

.contact-item .info .label {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: var(--spacing-xs);
}

.contact-item .info .value {
  font-size: var(--font-size-base);
  color: #ffffff;
  font-weight: 500;
}

.contact-item .info a {
  color: #ffffff;
}

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

.contact-map {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-light);
}

.contact-map-placeholder {
  text-align: center;
  padding: var(--spacing-3xl);
}

.contact-map-placeholder svg {
  width: 64px;
  height: 64px;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
}

.contact-map-placeholder p {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* --- Footer --- */
.footer {
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
  padding-bottom: var(--spacing-2xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .logo-text .company-name {
  color: #ffffff;
}

.footer-brand .logo-text .company-slogan {
  color: rgba(255, 255, 255, 0.4);
}

.footer-brand p {
  margin-top: var(--spacing-md);
  font-size: var(--font-size-sm);
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.5);
}

.footer-column h4 {
  font-size: var(--font-size-base);
  color: #ffffff;
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  letter-spacing: 1px;
}

.footer-column a {
  display: block;
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.5);
  padding: var(--spacing-xs) 0;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.3);
}

/* --- Back to Top --- */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  color: #ffffff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  z-index: 100;
}

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

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-3px);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
}

/* --- Floating Contact Bar (Mobile) --- */
.floating-contact {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-sm) 0;
  z-index: 100;
  box-shadow: 0 -4px 12px rgba(0,0,0,0.08);
}

.floating-contact .container {
  display: flex;
  justify-content: space-around;
}

.floating-contact a {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  color: var(--color-text-light);
}

.floating-contact a svg {
  width: 22px;
  height: 22px;
  color: var(--color-primary);
}

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

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

.fade-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.fade-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* --- Responsive: Tablet (max-width: 1024px) --- */
@media (max-width: 1024px) {
  :root {
    --font-size-4xl: 36px;
    --font-size-3xl: 28px;
    --spacing-4xl: 72px;
  }

  .nav-desktop {
    display: none;
  }

  .nav-phone {
    display: flex;
  }

  .menu-toggle {
    display: flex;
  }

  .nav-mobile-overlay {
    display: block;
  }

  .nav-mobile {
    display: block;
  }

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

  .team-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }

  .about-image::after {
    display: none;
  }

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

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
  }

  .hero-cta {
    flex-direction: column;
    align-items: flex-start;
  }

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

  .stat-item:nth-child(2) {
    border-right: none;
  }

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

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

/* --- Responsive: Mobile (max-width: 768px) --- */
@media (max-width: 768px) {
  :root {
    --font-size-4xl: 28px;
    --font-size-3xl: 24px;
    --font-size-2xl: 22px;
    --spacing-4xl: 56px;
    --spacing-3xl: 40px;
    --container-padding: 16px;
    --header-height: 64px;
  }

  .logo-icon {
    width: 40px;
    height: 40px;
  }

  .logo-text .company-name {
    font-size: var(--font-size-base);
  }

  .hero {
    min-height: auto;
    padding-top: calc(var(--header-height) + var(--spacing-2xl));
    padding-bottom: var(--spacing-3xl);
  }

  .hero h1 {
    font-size: var(--font-size-3xl);
  }

  .hero-values {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .hero-cta {
    width: 100%;
  }

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

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

  .cases-gallery {
    grid-template-columns: 1fr;
  }

  .case-card img {
    height: 200px;
  }

  .certificates-scroll {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
  }

  .team-principles {
    grid-template-columns: 1fr;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
  }

  .floating-contact {
    display: block;
  }

  .back-to-top {
    bottom: 80px;
  }

  .stats-bar {
    margin-top: -40px;
  }

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

  .stat-number {
    font-size: var(--font-size-2xl);
  }

  .section-tag::before,
  .section-tag::after {
    display: none;
  }
}

/* --- Responsive: Small Mobile (max-width: 480px) --- */
@media (max-width: 480px) {
  :root {
    --font-size-4xl: 24px;
    --font-size-3xl: 20px;
    --spacing-4xl: 40px;
  }

  .logo-text .company-slogan {
    display: none;
  }

  .btn {
    padding: 12px 24px;
    font-size: var(--font-size-sm);
  }
}

/* --- Print Styles --- */
@media print {
  .header,
  .back-to-top,
  .floating-contact,
  .menu-toggle,
  .nav-mobile-overlay,
  .nav-mobile {
    display: none !important;
  }

  .hero {
    min-height: auto;
    padding: 40px 0;
  }

  .section {
    padding: 24px 0;
  }

  body {
    color: #000;
    background: #fff;
  }
}