/* ===== 碁跨境 企业官网样式 ===== */

:root {
  --color-primary: #8B1A1A;
  --color-accent: #E8901A;
  --color-dark: #1a1a1a;
  --color-light: #f8f6f3;
  --color-white: #ffffff;
  --color-gray: #666666;
  --color-border: #e0d8d0;
  --max-width: 1100px;
  --radius: 6px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  color: var(--color-dark);
  background: var(--color-white);
  line-height: 1.8;
  font-size: 16px;
}

a {
  color: inherit;
  text-decoration: none;
}

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

ul {
  list-style: none;
}

/* ===== Header / Nav ===== */
.site-header {
  background: var(--color-white);
  border-bottom: 2px solid var(--color-primary);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-area img {
  height: 42px;
  width: auto;
}

.logo-area .site-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 1px;
}

.logo-area .site-name-en {
  font-size: 11px;
  color: var(--color-gray);
  letter-spacing: 0.5px;
}

/* Desktop nav */
.main-nav ul {
  display: flex;
  gap: 6px;
}

.main-nav a {
  display: block;
  padding: 8px 18px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-dark);
  border-radius: var(--radius);
  transition: background 0.2s, color 0.2s;
}

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

/* Mobile hamburger */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  margin: 5px 0;
  border-radius: 2px;
  transition: transform 0.3s;
}

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, #5c1010 100%);
  color: var(--color-white);
  text-align: center;
  padding: 80px 20px 70px;
}

.hero h1 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: 2px;
}

.hero p {
  font-size: 18px;
  opacity: 0.9;
  margin-bottom: 32px;
}

.hero .btn {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-white);
  padding: 12px 36px;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 600;
  transition: background 0.2s;
}

.hero .btn:hover {
  background: #d07c10;
}

/* ===== Page Banner (inner pages) ===== */
.page-banner {
  background: linear-gradient(135deg, var(--color-primary) 0%, #5c1010 100%);
  color: var(--color-white);
  text-align: center;
  padding: 50px 20px 40px;
}

.page-banner h1 {
  font-size: 30px;
  font-weight: 700;
  letter-spacing: 2px;
}

.page-banner p {
  font-size: 15px;
  opacity: 0.85;
  margin-top: 8px;
}

/* ===== Container ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 50px 20px;
}

/* ===== Section Titles ===== */
.section-title {
  text-align: center;
  margin-bottom: 40px;
}

.section-title h2 {
  font-size: 26px;
  color: var(--color-primary);
  margin-bottom: 10px;
  position: relative;
  display: inline-block;
}

.section-title h2::after {
  content: "";
  display: block;
  width: 50px;
  height: 3px;
  background: var(--color-accent);
  margin: 10px auto 0;
  border-radius: 2px;
}

.section-title p {
  color: var(--color-gray);
  font-size: 15px;
}

/* ===== Cards Grid ===== */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: box-shadow 0.3s, transform 0.2s;
}

.card:hover {
  box-shadow: 0 6px 24px rgba(139, 26, 26, 0.10);
  transform: translateY(-3px);
}

.card .icon {
  font-size: 40px;
  margin-bottom: 16px;
}

.card h3 {
  font-size: 18px;
  color: var(--color-primary);
  margin-bottom: 10px;
}

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

/* ===== Company Intro Section ===== */
.intro-section {
  background: var(--color-light);
  padding: 50px 20px;
}

.intro-section .inner {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

.intro-section p {
  font-size: 16px;
  color: var(--color-dark);
  max-width: 700px;
  margin: 0 auto;
  line-height: 2;
}

/* ===== About Page ===== */
.about-content {
  line-height: 2;
  font-size: 15px;
  color: #333;
}

.about-content p {
  margin-bottom: 20px;
  text-indent: 2em;
}

.trademark-section {
  background: var(--color-light);
  padding: 50px 20px;
}

.trademark-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

.trademark-img-wrap {
  display: inline-block;
  position: relative;
  max-width: 420px;
  margin: 20px auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.trademark-img-wrap img {
  display: block;
  width: 100%;
}

/* 模糊左上角二维码区域 */
.trademark-img-wrap::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 28%;
  height: 22%;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: rgba(255, 255, 255, 0.3);
  z-index: 2;
}

.trademark-note {
  font-size: 14px;
  color: var(--color-gray);
  margin-top: 14px;
}

.qualification-list {
  margin-top: 10px;
}

.qualification-list li {
  padding: 8px 0;
  padding-left: 20px;
  position: relative;
  font-size: 15px;
  color: #333;
}

.qualification-list li::before {
  content: "•";
  color: var(--color-accent);
  font-weight: bold;
  position: absolute;
  left: 0;
}

/* ===== Services Page - Tabs ===== */
.tabs {
  display: flex;
  justify-content: center;
  gap: 4px;
  margin-bottom: 36px;
}

.tab-btn {
  background: var(--color-light);
  border: 2px solid var(--color-border);
  padding: 10px 32px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  border-radius: var(--radius);
  color: var(--color-dark);
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  font-family: inherit;
}

.tab-btn.active {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.tab-btn:hover:not(.active) {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.service-item {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 28px;
  margin-bottom: 20px;
  transition: box-shadow 0.2s;
}

.service-item:hover {
  box-shadow: 0 4px 16px rgba(139, 26, 26, 0.08);
}

.service-item h3 {
  font-size: 17px;
  color: var(--color-primary);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.service-item h3 .num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--color-accent);
  color: var(--color-white);
  border-radius: 50%;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
}

.service-item p {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.8;
  padding-left: 36px;
}

/* ===== Contact Page ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.contact-info h3 {
  font-size: 18px;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.contact-info .info-item {
  margin-bottom: 16px;
  font-size: 15px;
  color: #333;
}

.contact-info .info-item strong {
  display: block;
  color: var(--color-dark);
  margin-bottom: 2px;
}

.contact-form h3 {
  font-size: 18px;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.contact-form label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 4px;
  color: #333;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 15px;
  font-family: inherit;
  margin-bottom: 16px;
  transition: border-color 0.2s;
  background: var(--color-white);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

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

.contact-form .submit-btn {
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  padding: 12px 40px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius);
  cursor: pointer;
  font-family: inherit;
  transition: background 0.2s;
}

.contact-form .submit-btn:hover {
  background: #6e1414;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-dark);
  color: #ccc;
  text-align: center;
  padding: 30px 20px 24px;
  font-size: 13px;
  line-height: 2;
}

.site-footer .footer-company {
  font-size: 14px;
  color: #eee;
  margin-bottom: 4px;
}

.site-footer .footer-address {
  color: #999;
}

.site-footer .footer-icp a {
  color: #aaa;
  text-decoration: underline;
  transition: color 0.2s;
}

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

.site-footer .footer-copy {
  color: #777;
  margin-top: 4px;
}

/* ===== CTA Section ===== */
.cta-section {
  background: var(--color-light);
  text-align: center;
  padding: 50px 20px;
}

.cta-section h2 {
  font-size: 22px;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.cta-section p {
  color: var(--color-gray);
  margin-bottom: 24px;
}

.cta-section .btn {
  display: inline-block;
  background: var(--color-primary);
  color: var(--color-white);
  padding: 12px 36px;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 600;
  transition: background 0.2s;
}

.cta-section .btn:hover {
  background: #6e1414;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-white);
    border-bottom: 2px solid var(--color-primary);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  }

  .main-nav.open {
    display: block;
  }

  .main-nav ul {
    flex-direction: column;
    padding: 10px 20px;
    gap: 0;
  }

  .main-nav a {
    padding: 12px 16px;
    border-radius: 0;
    border-bottom: 1px solid var(--color-border);
  }

  .hero {
    padding: 50px 20px 45px;
  }

  .hero h1 {
    font-size: 26px;
  }

  .hero p {
    font-size: 15px;
  }

  .page-banner {
    padding: 36px 20px 30px;
  }

  .page-banner h1 {
    font-size: 24px;
  }

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

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

  .container {
    padding: 36px 16px;
  }

  .tabs {
    flex-direction: column;
    align-items: center;
  }

  .tab-btn {
    width: 80%;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .logo-area .site-name {
    font-size: 17px;
  }

  .hero h1 {
    font-size: 22px;
  }
}