/* ========================================
   玄易科技智能AI - 设计工作室官网
   Apollo 温暖专业设计风格
   ======================================== */

:root {
  --color-earth-umber: #3c261c;
  --color-terracotta-flame: #e97451;
  --color-deep-violet: #4a43dd;
  --color-pale-ochre: #f7efc5;
  --color-platinum-frost: #dddedf;
  --color-jet-black: #000000;
  --color-warm-linen: #f9f8f0;
  --color-peach-cream: #fcede8;
  --font-monasans: 'MonaSans', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-paradigm-pro: 'paradigm-pro', ui-serif, Georgia, "Times New Roman", serif;
  --text-caption: 12px;
  --text-body-sm: 14px;
  --text-body: 18px;
  --text-subheading: 20px;
  --text-heading-sm: 32px;
  --text-heading: 36px;
  --text-display: 47px;
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --spacing-10: 10px;
  --spacing-14: 14px;
  --spacing-17: 17px;
  --spacing-20: 20px;
  --spacing-23: 23px;
  --spacing-30: 30px;
  --spacing-34: 34px;
  --spacing-40: 40px;
  --spacing-45: 45px;
  --spacing-60: 60px;
  --spacing-68: 68px;
  --spacing-90: 90px;
  --section-gap: 68px;
  --card-padding: 45px;
  --element-gap: 20px;
  --radius-sm: 3px;
  --radius-cards: 3px;
  --radius-images: 3px;
  --radius-buttons: 3px;
  --radius-navitems: 3px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-monasans);
  font-size: var(--text-body);
  line-height: 1.49;
  letter-spacing: 0.54px;
  color: var(--color-earth-umber);
  background-color: var(--color-warm-linen);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-earth-umber); text-decoration: none; transition: all 0.3s ease; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 var(--spacing-40); }
.section { padding: var(--section-gap) 0; }

/* 导航栏 */
.navbar {
  position: fixed; top: 0; left: 0; right: 0;
  background-color: var(--color-warm-linen);
  border-bottom: 1px solid var(--color-platinum-frost);
  z-index: 1000; transition: all 0.3s ease;
}
.navbar.scrolled { box-shadow: 0 2px 20px rgba(60, 38, 28, 0.08); }
.navbar .container { display: flex; align-items: center; justify-content: space-between; height: 80px; }

.navbar-logo { display: flex; align-items: center; gap: var(--spacing-14); }
.navbar-logo .logo-icon {
  width: 40px; height: 40px;
  background: var(--color-terracotta-flame);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-peach-cream);
  font-family: var(--font-paradigm-pro);
  font-size: 20px; font-weight: var(--font-weight-light);
}
.navbar-logo span {
  font-family: var(--font-paradigm-pro);
  font-size: var(--text-subheading);
  font-weight: var(--font-weight-light);
  letter-spacing: 1px;
}

.navbar-menu { display: flex; align-items: center; gap: var(--spacing-10); }
.navbar-menu a {
  font-size: var(--text-body-sm); font-weight: var(--font-weight-medium);
  padding: var(--spacing-17) var(--spacing-34);
  border: 1px solid transparent; border-radius: var(--radius-navitems);
  transition: all 0.3s ease;
}
.navbar-menu a:hover, .navbar-menu a.active { border-color: var(--color-earth-umber); text-decoration: none; }

.navbar-cta .btn-primary { padding: 14px 30px; font-size: var(--text-body-sm); }

.btn-primary {
  display: inline-block;
  background-color: var(--color-terracotta-flame); color: var(--color-peach-cream);
  font-family: var(--font-monasans); font-size: var(--text-body-sm); font-weight: var(--font-weight-regular);
  padding: 22.5px 45px; border: none; border-radius: var(--radius-buttons);
  cursor: pointer; transition: all 0.3s ease; text-align: center;
}
.btn-primary:hover { opacity: 0.9; text-decoration: none; }

.btn-secondary {
  display: inline-block; background-color: transparent; color: var(--color-warm-linen);
  font-family: var(--font-monasans); font-size: var(--text-body-sm); font-weight: var(--font-weight-medium);
  padding: 20px 43px; border: 1px solid var(--color-warm-linen); border-radius: var(--radius-buttons);
  cursor: pointer; transition: all 0.3s ease; text-align: center;
}
.btn-secondary:hover { background-color: var(--color-warm-linen); color: var(--color-earth-umber); text-decoration: none; }

.btn-outline {
  display: inline-block; background-color: transparent; color: var(--color-earth-umber);
  font-family: var(--font-monasans); font-size: var(--text-body-sm); font-weight: var(--font-weight-medium);
  padding: 17px 34px; border: 1px solid var(--color-earth-umber); border-radius: var(--radius-buttons);
  cursor: pointer; transition: all 0.3s ease; text-align: center;
}
.btn-outline:hover { background-color: var(--color-earth-umber); color: var(--color-warm-linen); text-decoration: none; }

.mobile-menu-btn { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 10px; }
.mobile-menu-btn span { width: 25px; height: 2px; background-color: var(--color-earth-umber); transition: all 0.3s ease; }

/* Hero */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  background-color: var(--color-earth-umber); overflow: hidden; padding-top: 80px;
}
.hero-bg {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(135deg, var(--color-earth-umber) 0%, #5a3d2e 50%, #4a3020 100%);
}
.hero-bg::after {
  content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(233, 116, 81, 0.08) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 30%, rgba(247, 239, 197, 0.05) 0%, transparent 50%);
}
.hero-content { position: relative; text-align: center; max-width: 900px; padding: var(--spacing-68) var(--spacing-40); z-index: 1; }
.hero-title {
  font-family: var(--font-paradigm-pro);
  font-size: var(--text-display); font-weight: var(--font-weight-light);
  line-height: 0.97; letter-spacing: 3.76px;
  color: var(--color-warm-linen); margin-bottom: var(--spacing-30);
}
.hero-subtitle {
  font-size: var(--text-body); font-weight: var(--font-weight-light);
  color: var(--color-pale-ochre); margin-bottom: var(--spacing-45);
  max-width: 600px; margin-left: auto; margin-right: auto;
}
.hero-buttons { display: flex; gap: var(--spacing-20); justify-content: center; flex-wrap: wrap; }

/* 区域标题 */
.section-header { text-align: center; margin-bottom: var(--spacing-60); }
.section-title {
  font-family: var(--font-monasans);
  font-size: var(--text-heading); font-weight: var(--font-weight-semibold);
  line-height: 1.17; letter-spacing: 1.08px;
  color: var(--color-earth-umber); margin-bottom: var(--spacing-20);
}
.section-subtitle { font-size: var(--text-body); opacity: 0.7; max-width: 600px; margin: 0 auto; }

/* 关于我们 */
.about-content { display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-68); align-items: center; }
.about-text h3 {
  font-family: var(--font-paradigm-pro);
  font-size: var(--text-heading-sm); font-weight: var(--font-weight-light);
  margin-bottom: var(--spacing-30);
}
.about-text p { margin-bottom: var(--spacing-20); opacity: 0.85; }
.about-image {
  border-radius: var(--radius-images); overflow: hidden;
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, var(--color-pale-ochre) 0%, var(--color-platinum-frost) 100%);
  display: flex; align-items: center; justify-content: center;
}

.values-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--spacing-30); margin-top: var(--spacing-60); }
.value-card {
  text-align: center; padding: var(--card-padding);
  background-color: var(--color-warm-linen);
  border: 1px solid var(--color-platinum-frost); border-radius: var(--radius-cards);
  transition: all 0.3s ease;
}
.value-card:hover { box-shadow: 0 2px 8px rgba(60, 38, 28, 0.08); transform: translateY(-2px); }
.value-icon { width: 60px; height: 60px; margin: 0 auto var(--spacing-20); display: flex; align-items: center; justify-content: center; }
.value-icon svg { width: 40px; height: 40px; stroke: var(--color-terracotta-flame); fill: none; stroke-width: 1.5; }
.value-card h4 { font-size: var(--text-subheading); font-weight: var(--font-weight-semibold); margin-bottom: var(--spacing-14); }
.value-card p { font-size: var(--text-body-sm); opacity: 0.75; }

/* 作品展示 */
.works-filter { display: flex; justify-content: center; gap: var(--spacing-14); margin-bottom: var(--spacing-45); flex-wrap: wrap; }
.filter-btn {
  font-family: var(--font-monasans); font-size: var(--text-body-sm); font-weight: var(--font-weight-medium);
  padding: var(--spacing-14) var(--spacing-30);
  border: 1px solid var(--color-platinum-frost); border-radius: var(--radius-buttons);
  background: transparent; color: var(--color-earth-umber); cursor: pointer; transition: all 0.3s ease;
}
.filter-btn:hover, .filter-btn.active { border-color: var(--color-earth-umber); background-color: var(--color-earth-umber); color: var(--color-warm-linen); }

.works-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--spacing-30); }
.work-card {
  background-color: var(--color-warm-linen);
  border: 1px solid var(--color-platinum-frost); border-radius: var(--radius-cards);
  overflow: hidden; transition: all 0.3s ease;
}
.work-card:hover { box-shadow: 0 2px 8px rgba(60, 38, 28, 0.08); transform: translateY(-4px); }
.work-card-image {
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, var(--color-pale-ochre) 0%, var(--color-platinum-frost) 100%);
  display: flex; align-items: center; justify-content: center; overflow: hidden;
}
.work-card-content { padding: var(--spacing-30); }
.work-card-tag {
  display: inline-block; font-size: var(--text-caption); font-weight: var(--font-weight-medium);
  padding: var(--spacing-10) var(--spacing-14);
  background-color: var(--color-pale-ochre); color: var(--color-earth-umber);
  border-radius: var(--radius-sm); margin-bottom: var(--spacing-14);
}
.work-card-title { font-size: var(--text-subheading); font-weight: var(--font-weight-semibold); margin-bottom: var(--spacing-14); }
.work-card-link { display: inline-flex; align-items: center; gap: var(--spacing-10); font-size: var(--text-body-sm); font-weight: var(--font-weight-medium); color: var(--color-terracotta-flame); }
.work-card-link:hover { text-decoration: none; gap: var(--spacing-14); }

/* 服务项目 */
.services-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--spacing-30); }
.service-card {
  display: flex; gap: var(--spacing-30); padding: var(--card-padding);
  background-color: var(--color-warm-linen);
  border: 1px solid var(--color-platinum-frost); border-radius: var(--radius-cards);
  transition: all 0.3s ease;
}
.service-card:hover { box-shadow: 0 2px 8px rgba(60, 38, 28, 0.08); transform: translateY(-2px); }
.service-icon {
  flex-shrink: 0; width: 60px; height: 60px;
  display: flex; align-items: center; justify-content: center;
  background-color: var(--color-pale-ochre); border-radius: var(--radius-cards);
}
.service-icon svg { width: 32px; height: 32px; stroke: var(--color-terracotta-flame); fill: none; stroke-width: 1.5; }
.service-content h4 { font-size: var(--text-subheading); font-weight: var(--font-weight-semibold); margin-bottom: var(--spacing-14); }
.service-content p { font-size: var(--text-body-sm); opacity: 0.75; margin-bottom: var(--spacing-20); }
.service-link { font-size: var(--text-body-sm); font-weight: var(--font-weight-medium); color: var(--color-terracotta-flame); }

/* 团队介绍 */
.team-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--spacing-30); }
.team-card {
  text-align: center; padding: var(--card-padding) var(--spacing-30);
  background-color: var(--color-warm-linen);
  border: 1px solid var(--color-platinum-frost); border-radius: var(--radius-cards);
  transition: all 0.3s ease;
}
.team-card:hover { box-shadow: 0 2px 8px rgba(60, 38, 28, 0.08); }
.team-avatar {
  width: 100px; height: 100px; margin: 0 auto var(--spacing-20);
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-pale-ochre) 0%, var(--color-platinum-frost) 100%);
  display: flex; align-items: center; justify-content: center;
}
.team-card h4 { font-size: var(--text-body); font-weight: var(--font-weight-semibold); margin-bottom: var(--spacing-10); }
.team-card .position { font-size: var(--text-body-sm); color: var(--color-terracotta-flame); margin-bottom: var(--spacing-14); }
.team-card p { font-size: var(--text-caption); opacity: 0.7; }

/* 联系我们 */
.contact-content { display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-68); }
.contact-info h3 {
  font-family: var(--font-paradigm-pro);
  font-size: var(--text-heading-sm); font-weight: var(--font-weight-light);
  margin-bottom: var(--spacing-30);
}
.contact-info-item { display: flex; gap: var(--spacing-20); margin-bottom: var(--spacing-30); }
.contact-info-icon {
  flex-shrink: 0; width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  background-color: var(--color-pale-ochre); border-radius: var(--radius-cards);
}
.contact-info-icon svg { width: 20px; height: 20px; stroke: var(--color-terracotta-flame); fill: none; stroke-width: 1.5; }
.contact-info-text h5 { font-size: var(--text-body-sm); font-weight: var(--font-weight-semibold); margin-bottom: var(--spacing-10); }
.contact-info-text p { font-size: var(--text-body-sm); opacity: 0.75; }

.contact-form {
  background-color: var(--color-warm-linen);
  border: 1px solid var(--color-platinum-frost); border-radius: var(--radius-cards);
  padding: var(--card-padding);
}
.form-group { margin-bottom: var(--spacing-23); }
.form-group label { display: block; font-size: var(--text-body-sm); font-weight: var(--font-weight-medium); margin-bottom: var(--spacing-10); }
.form-group input, .form-group textarea {
  width: 100%; font-family: var(--font-monasans); font-size: var(--text-body-sm);
  padding: var(--spacing-17) var(--spacing-20);
  border: 1px solid var(--color-platinum-frost); border-radius: var(--radius-sm);
  background-color: var(--color-warm-linen); color: var(--color-earth-umber);
  transition: border-color 0.3s ease;
}
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--color-terracotta-flame); }
.form-group textarea { min-height: 120px; resize: vertical; }

/* 页脚 */
.footer { background-color: var(--color-earth-umber); color: var(--color-warm-linen); padding: var(--spacing-68) 0 var(--spacing-30); }
.footer-content { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--spacing-45); margin-bottom: var(--spacing-45); }
.footer-brand h4 { font-family: var(--font-paradigm-pro); font-size: var(--text-heading-sm); font-weight: var(--font-weight-light); margin-bottom: var(--spacing-20); }
.footer-brand p { font-size: var(--text-body-sm); opacity: 0.7; margin-bottom: var(--spacing-20); }
.footer-social { display: flex; gap: var(--spacing-14); }
.footer-social a {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid rgba(249, 248, 240, 0.3); border-radius: 50%;
  opacity: 0.7; transition: all 0.3s ease;
}
.footer-social a:hover { opacity: 1; background-color: var(--color-terracotta-flame); border-color: var(--color-terracotta-flame); text-decoration: none; }
.footer-social svg { width: 16px; height: 16px; fill: var(--color-warm-linen); }
.footer-links h5 { font-size: var(--text-body-sm); font-weight: var(--font-weight-semibold); margin-bottom: var(--spacing-20); }
.footer-links ul li { margin-bottom: var(--spacing-14); }
.footer-links a { font-size: var(--text-body-sm); opacity: 0.7; color: var(--color-warm-linen); }
.footer-links a:hover { opacity: 1; color: var(--color-terracotta-flame); }
.footer-bottom { padding-top: var(--spacing-30); border-top: 1px solid rgba(249, 248, 240, 0.1); text-align: center; font-size: var(--text-caption); opacity: 0.5; }

/* 内页 */
.page-hero { background-color: var(--color-earth-umber); padding: calc(80px + var(--spacing-68)) 0 var(--spacing-68); text-align: center; }
.page-hero h1 {
  font-family: var(--font-paradigm-pro);
  font-size: var(--text-display); font-weight: var(--font-weight-light);
  line-height: 0.97; letter-spacing: 3.76px;
  color: var(--color-warm-linen); margin-bottom: var(--spacing-20);
}
.page-hero p { font-size: var(--text-body); color: var(--color-pale-ochre); max-width: 600px; margin: 0 auto; }
.breadcrumb { display: flex; justify-content: center; gap: var(--spacing-14); margin-top: var(--spacing-20); font-size: var(--text-body-sm); }
.breadcrumb a { color: var(--color-pale-ochre); opacity: 0.7; }
.breadcrumb a:hover { opacity: 1; }
.breadcrumb .sep { opacity: 0.4; }
.breadcrumb .current { color: var(--color-pale-ochre); opacity: 0.5; }

.detail-content { max-width: 800px; margin: 0 auto; }
.detail-image {
  aspect-ratio: 16/9;
  background: linear-gradient(135deg, var(--color-pale-ochre) 0%, var(--color-platinum-frost) 100%);
  border-radius: var(--radius-images); margin-bottom: var(--spacing-45);
  display: flex; align-items: center; justify-content: center;
}
.detail-meta { display: flex; gap: var(--spacing-30); margin-bottom: var(--spacing-30); padding-bottom: var(--spacing-30); border-bottom: 1px solid var(--color-platinum-frost); flex-wrap: wrap; }
.detail-meta-item { display: flex; align-items: center; gap: var(--spacing-10); font-size: var(--text-body-sm); opacity: 0.7; }
.detail-text h2 { font-size: var(--text-heading-sm); font-weight: var(--font-weight-semibold); margin: var(--spacing-40) 0 var(--spacing-20); }
.detail-text h3 { font-size: var(--text-subheading); font-weight: var(--font-weight-semibold); margin: var(--spacing-30) 0 var(--spacing-17); }
.detail-text p { margin-bottom: var(--spacing-20); opacity: 0.85; }
.detail-text ul { margin-bottom: var(--spacing-20); padding-left: var(--spacing-30); }
.detail-text ul li { margin-bottom: var(--spacing-10); position: relative; padding-left: var(--spacing-20); }
.detail-text ul li::before { content: ''; position: absolute; left: 0; top: 10px; width: 6px; height: 6px; background-color: var(--color-terracotta-flame); border-radius: 50%; }

.back-link { display: inline-flex; align-items: center; gap: var(--spacing-10); font-size: var(--text-body-sm); font-weight: var(--font-weight-medium); color: var(--color-earth-umber); margin-bottom: var(--spacing-30); }
.back-link:hover { text-decoration: none; color: var(--color-terracotta-flame); }

/* 发展历程 */
.timeline { position: relative; max-width: 800px; margin: 0 auto; }
.timeline::before { content: ''; position: absolute; left: 50%; top: 0; bottom: 0; width: 1px; background-color: var(--color-platinum-frost); transform: translateX(-50%); }
.timeline-item { display: flex; align-items: flex-start; margin-bottom: var(--spacing-45); position: relative; }
.timeline-item:nth-child(odd) { flex-direction: row-reverse; }
.timeline-dot { position: absolute; left: 50%; top: 5px; width: 12px; height: 12px; background-color: var(--color-terracotta-flame); border-radius: 50%; transform: translateX(-50%); z-index: 1; }
.timeline-content { width: 45%; padding: var(--spacing-30); background-color: var(--color-warm-linen); border: 1px solid var(--color-platinum-frost); border-radius: var(--radius-cards); }
.timeline-content .year { font-size: var(--text-body-sm); font-weight: var(--font-weight-semibold); color: var(--color-terracotta-flame); margin-bottom: var(--spacing-10); }
.timeline-content h4 { font-size: var(--text-body); font-weight: var(--font-weight-semibold); margin-bottom: var(--spacing-10); }
.timeline-content p { font-size: var(--text-body-sm); opacity: 0.75; }

/* 响应式 */
@media (max-width: 1024px) {
  .works-grid { grid-template-columns: repeat(2, 1fr); }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-content { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  :root { --text-display: 36px; --text-heading: 28px; --text-heading-sm: 24px; }
  .navbar-menu { display: none; position: absolute; top: 80px; left: 0; right: 0; background-color: var(--color-warm-linen); flex-direction: column; padding: var(--spacing-20); border-bottom: 1px solid var(--color-platinum-frost); }
  .navbar-menu.active { display: flex; }
  .navbar-menu a { width: 100%; text-align: center; }
  .mobile-menu-btn { display: flex; }
  .navbar-cta { display: none; }
  .hero-content { padding: var(--spacing-40) var(--spacing-20); }
  .about-content { grid-template-columns: 1fr; gap: var(--spacing-40); }
  .values-grid { grid-template-columns: 1fr; }
  .works-grid { grid-template-columns: 1fr; }
  .services-grid { grid-template-columns: 1fr; }
  .service-card { flex-direction: column; }
  .team-grid { grid-template-columns: 1fr; }
  .contact-content { grid-template-columns: 1fr; gap: var(--spacing-40); }
  .footer-content { grid-template-columns: 1fr; gap: var(--spacing-30); }
  .detail-meta { flex-direction: column; gap: var(--spacing-14); }
  .timeline::before { left: 20px; }
  .timeline-item, .timeline-item:nth-child(odd) { flex-direction: row; padding-left: 50px; }
  .timeline-dot { left: 20px; }
  .timeline-content { width: 100%; }
}

@media (max-width: 480px) {
  .container { padding: 0 var(--spacing-20); }
  .hero-buttons { flex-direction: column; align-items: center; }
  .btn-primary, .btn-secondary, .btn-outline { width: 100%; max-width: 280px; }
}