/* ========================================
   幻方游戏工作室 - 样式表
   设计风格：Apollo 温暖专业
   ======================================== */

/* CSS 自定义属性 */
:root {
  /* 颜色 */
  --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;

  /* 排版 - 字体族 */
  --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;

  /* 排版 - 比例 */
  --text-caption: 12px;
  --leading-caption: 1.5;
  --tracking-caption: 0.36px;
  --text-body-sm: 14px;
  --leading-body-sm: 1.5;
  --tracking-body-sm: 0.42px;
  --text-body: 18px;
  --leading-body: 1.49;
  --tracking-body: 0.54px;
  --text-subheading: 20px;
  --leading-subheading: 1.42;
  --tracking-subheading: 0.6px;
  --text-heading-sm: 32px;
  --leading-heading-sm: 1.35;
  --tracking-heading-sm: 0.96px;
  --text-heading: 36px;
  --leading-heading: 1.17;
  --tracking-heading: 1.08px;
  --text-display: 47px;
  --leading-display: 0.97;
  --tracking-display: 3.76px;

  /* 字重 */
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* 间距 */
  --spacing-10: 10px;
  --spacing-14: 14px;
  --spacing-17: 17px;
  --spacing-18: 18px;
  --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;

  /* 布局 */
  --section-gap: 68px;
  --card-padding: 45px;
  --element-gap: 20px;

  /* 圆角 */
  --radius-sm: 3px;
  --radius-cards: 3px;
  --radius-images: 3px;
  --radius-buttons: 3px;
  --radius-navitems: 3px;

  /* 表面 */
  --surface-warm-linen-canvas: #f9f8f0;
  --surface-earth-umber-panel: #3c261c;
}

/* 重置样式 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-monasans);
  font-size: var(--text-body);
  line-height: var(--leading-body);
  letter-spacing: var(--tracking-body);
  color: var(--color-earth-umber);
  background-color: var(--color-warm-linen);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* 容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-30);
}

/* ========================================
   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;
  padding: var(--spacing-17) 0;
}

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

.logo {
  font-family: var(--font-paradigm-pro);
  font-size: var(--text-heading-sm);
  font-weight: var(--font-weight-light);
  letter-spacing: var(--tracking-heading-sm);
  color: var(--color-earth-umber);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-10);
}

.nav-links 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;
}

.nav-links a:hover,
.nav-links a.active {
  border-color: var(--color-earth-umber);
}

/* ========================================
   按钮
   ======================================== */
.btn-primary {
  display: inline-block;
  background-color: var(--color-terracotta-flame);
  color: var(--color-peach-cream);
  font-size: var(--text-body);
  font-weight: var(--font-weight-regular);
  padding: 22.5px 45px;
  border-radius: var(--radius-buttons);
  transition: all 0.3s ease;
  text-align: center;
}

.btn-primary:hover {
  opacity: 0.9;
}

.btn-secondary {
  display: inline-block;
  background-color: transparent;
  color: var(--color-earth-umber);
  font-size: var(--text-body);
  font-weight: var(--font-weight-medium);
  padding: 22.5px 45px;
  border: 1px solid var(--color-earth-umber);
  border-radius: var(--radius-buttons);
  transition: all 0.3s ease;
  text-align: center;
}

.btn-secondary:hover {
  background-color: var(--color-earth-umber);
  color: var(--color-warm-linen);
}

/* ========================================
   文本链接
   ======================================== */
.text-link {
  font-size: var(--text-body);
  font-weight: var(--font-weight-regular);
  color: var(--color-earth-umber);
  transition: all 0.3s ease;
}

.text-link:hover {
  text-decoration: underline;
}

.back-link {
  display: inline-block;
  font-size: var(--text-body);
  font-weight: var(--font-weight-medium);
  color: var(--color-earth-umber);
  margin-bottom: var(--spacing-40);
  transition: all 0.3s ease;
}

.back-link:hover {
  text-decoration: underline;
}

/* ========================================
   英雄区 (Banner)
   ======================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--surface-earth-umber-panel);
  background-image: 
    linear-gradient(rgba(60, 38, 28, 0.7), rgba(60, 38, 28, 0.7)),
    url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 800"><rect fill="%233c261c" width="1200" height="800"/><circle cx="600" cy="400" r="300" fill="%23e97451" opacity="0.1"/></svg>');
  background-size: cover;
  background-position: center;
  padding: var(--spacing-90) var(--spacing-30);
  margin-top: 70px;
}

.hero-content {
  text-align: center;
  max-width: 800px;
}

.hero-title {
  font-family: var(--font-paradigm-pro);
  font-size: var(--text-display);
  font-weight: var(--font-weight-light);
  line-height: var(--leading-display);
  letter-spacing: var(--tracking-display);
  color: var(--color-warm-linen);
  margin-bottom: var(--spacing-30);
}

.hero-subtitle {
  font-size: var(--text-subheading);
  font-weight: var(--font-weight-light);
  line-height: var(--leading-subheading);
  letter-spacing: var(--tracking-subheading);
  color: var(--color-pale-ochre);
  margin-bottom: var(--spacing-45);
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-20);
  justify-content: center;
  flex-wrap: wrap;
}

.hero-buttons .btn-secondary {
  color: var(--color-warm-linen);
  border-color: var(--color-warm-linen);
}

.hero-buttons .btn-secondary:hover {
  background-color: var(--color-warm-linen);
  color: var(--color-earth-umber);
}

/* ========================================
   页面标题
   ======================================== */
.page-header {
  background-color: var(--surface-earth-umber-panel);
  padding: calc(var(--spacing-90) + 70px) var(--spacing-30) var(--spacing-90);
  text-align: center;
}

.page-title {
  font-family: var(--font-paradigm-pro);
  font-size: var(--text-display);
  font-weight: var(--font-weight-light);
  line-height: var(--leading-display);
  letter-spacing: var(--tracking-display);
  color: var(--color-warm-linen);
  margin-bottom: var(--spacing-20);
}

.page-subtitle {
  font-size: var(--text-subheading);
  font-weight: var(--font-weight-light);
  color: var(--color-pale-ochre);
}

/* ========================================
   通用区块
   ======================================== */
.section {
  padding: var(--section-gap) 0;
}

.section-title {
  font-family: var(--font-monasans);
  font-size: var(--text-heading);
  font-weight: var(--font-weight-semibold);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-earth-umber);
  margin-bottom: var(--spacing-45);
  text-align: center;
}

.section-footer {
  text-align: center;
  margin-top: var(--spacing-60);
}

/* ========================================
   核心优势
   ======================================== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-40);
}

.advantage-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;
}

.advantage-card:hover {
  box-shadow: 0 2px 8px rgba(60, 38, 28, 0.08);
}

.advantage-icon {
  margin-bottom: var(--spacing-30);
}

.advantage-card h3 {
  font-size: var(--text-subheading);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-17);
}

.advantage-card p {
  font-size: var(--text-body-sm);
  color: var(--color-earth-umber);
  opacity: 0.8;
}

/* ========================================
   关于我们简介
   ======================================== */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-60);
  align-items: center;
}

.about-text .section-title {
  text-align: left;
}

.about-description {
  font-size: var(--text-body);
  line-height: var(--leading-body);
  margin-bottom: var(--spacing-23);
}

.about-image .image-placeholder {
  border-radius: var(--radius-images);
  overflow: hidden;
}

/* ========================================
   作品展示
   ======================================== */
.works-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-40);
}

.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-image {
  aspect-ratio: 4/3;
  overflow: hidden;
}

.work-image .image-placeholder {
  width: 100%;
  height: 100%;
}

.work-info {
  padding: var(--spacing-30);
}

.work-category {
  display: inline-block;
  font-size: var(--text-caption);
  font-weight: var(--font-weight-medium);
  color: var(--color-terracotta-flame);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--spacing-10);
}

.work-title {
  font-size: var(--text-subheading);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-14);
}

.work-description {
  font-size: var(--text-body-sm);
  color: var(--color-earth-umber);
  opacity: 0.8;
  margin-bottom: var(--spacing-20);
}

/* ========================================
   作品筛选
   ======================================== */
.works-filter {
  display: flex;
  justify-content: center;
  gap: var(--spacing-17);
  flex-wrap: wrap;
  margin-bottom: var(--spacing-45);
}

.filter-btn {
  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);
  color: var(--color-earth-umber);
  transition: all 0.3s ease;
}

.filter-btn:hover,
.filter-btn.active {
  background-color: var(--color-earth-umber);
  border-color: var(--color-earth-umber);
  color: var(--color-warm-linen);
}

/* ========================================
   作品详情
   ======================================== */
.work-detail-section {
  padding-top: calc(var(--spacing-90) + 70px);
}

.work-detail-header {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--spacing-60);
  margin-bottom: var(--spacing-68);
}

.work-detail-image .image-placeholder.large {
  border-radius: var(--radius-images);
  overflow: hidden;
}

.work-detail-info .work-category {
  margin-bottom: var(--spacing-17);
}

.work-detail-title {
  font-family: var(--font-paradigm-pro);
  font-size: var(--text-heading);
  font-weight: var(--font-weight-light);
  letter-spacing: var(--tracking-heading);
  margin-bottom: var(--spacing-23);
}

.work-detail-desc {
  font-size: var(--text-body);
  line-height: var(--leading-body);
  margin-bottom: var(--spacing-34);
}

.work-detail-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-23);
}

.meta-item {
  padding: var(--spacing-17);
  background-color: var(--color-warm-linen);
  border: 1px solid var(--color-platinum-frost);
  border-radius: var(--radius-sm);
}

.meta-label {
  display: block;
  font-size: var(--text-caption);
  color: var(--color-earth-umber);
  opacity: 0.6;
  margin-bottom: var(--spacing-10);
}

.meta-value {
  font-size: var(--text-body-sm);
  font-weight: var(--font-weight-medium);
}

.work-detail-body h2 {
  font-size: var(--text-heading-sm);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-30);
  margin-top: var(--spacing-45);
}

.feature-list {
  list-style: none;
}

.feature-list li {
  padding: var(--spacing-17) 0;
  padding-left: var(--spacing-30);
  position: relative;
  font-size: var(--text-body);
  border-bottom: 1px solid var(--color-platinum-frost);
}

.feature-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  background-color: var(--color-terracotta-flame);
  border-radius: 50%;
}

.screenshot-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-20);
}

.screenshot-item .image-placeholder {
  border-radius: var(--radius-images);
  overflow: hidden;
}

.development-timeline {
  position: relative;
  padding-left: var(--spacing-40);
}

.development-timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--color-platinum-frost);
}

.dev-item {
  position: relative;
  padding-bottom: var(--spacing-30);
}

.dev-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--spacing-40) - 5px);
  top: 5px;
  width: 12px;
  height: 12px;
  background-color: var(--color-terracotta-flame);
  border-radius: 50%;
}

.dev-date {
  display: block;
  font-size: var(--text-body-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-terracotta-flame);
  margin-bottom: var(--spacing-10);
}

.dev-item p {
  font-size: var(--text-body);
}

/* ========================================
   发展历程
   ======================================== */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--color-platinum-frost);
}

.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-year {
  flex: 0 0 100px;
  font-size: var(--text-heading-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-terracotta-flame);
  text-align: center;
}

.timeline-content {
  flex: 1;
  padding: var(--spacing-30);
  background-color: var(--color-warm-linen);
  border: 1px solid var(--color-platinum-frost);
  border-radius: var(--radius-cards);
  margin: 0 var(--spacing-30);
}

.timeline-content h3 {
  font-size: var(--text-subheading);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-14);
}

.timeline-content p {
  font-size: var(--text-body-sm);
  color: var(--color-earth-umber);
  opacity: 0.8;
}

.timeline-item::after {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: 30px;
  width: 16px;
  height: 16px;
  background-color: var(--color-terracotta-flame);
  border-radius: 50%;
  border: 3px solid var(--color-warm-linen);
}

/* ========================================
   核心价值观
   ======================================== */
.values-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-40);
}

.value-card {
  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);
}

.value-icon {
  margin-bottom: var(--spacing-23);
}

.value-card h3 {
  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);
  line-height: var(--leading-body-sm);
}

/* ========================================
   设计理念
   ======================================== */
.philosophy-content {
  max-width: 800px;
  margin: 0 auto;
}

.philosophy-item {
  padding: var(--spacing-34) 0;
  border-bottom: 1px solid var(--color-platinum-frost);
}

.philosophy-item:last-child {
  border-bottom: none;
}

.philosophy-item h3 {
  font-size: var(--text-subheading);
  font-weight: var(--font-weight-semibold);
  color: var(--color-deep-violet);
  margin-bottom: var(--spacing-17);
}

.philosophy-item p {
  font-size: var(--text-body);
  line-height: var(--leading-body);
}

/* ========================================
   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(--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: 120px;
  height: 120px;
  margin: 0 auto var(--spacing-20);
  border-radius: 50%;
  overflow: hidden;
}

.team-card h3 {
  font-size: var(--text-body);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-10);
}

.team-role {
  font-size: var(--text-body-sm);
  color: var(--color-terracotta-flame);
  margin-bottom: var(--spacing-14);
}

.team-bio {
  font-size: var(--text-body-sm);
  line-height: var(--leading-body-sm);
}

/* ========================================
   联系我们
   ======================================== */
.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-68);
}

.contact-info .section-title {
  text-align: left;
}

.contact-items {
  margin-bottom: var(--spacing-45);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-20);
  margin-bottom: var(--spacing-30);
}

.contact-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-pale-ochre);
  border-radius: var(--radius-sm);
}

.contact-text h3 {
  font-size: var(--text-body);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-10);
}

.contact-text p {
  font-size: var(--text-body-sm);
}

.social-section h3 {
  font-size: var(--text-body);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-20);
}

.social-links {
  display: flex;
  gap: var(--spacing-20);
}

.social-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-10);
  padding: var(--spacing-14) var(--spacing-20);
  border: 1px solid var(--color-platinum-frost);
  border-radius: var(--radius-sm);
  transition: all 0.3s ease;
}

.social-link:hover {
  border-color: var(--color-earth-umber);
}

.social-link span {
  font-size: var(--text-body-sm);
  font-weight: var(--font-weight-medium);
}

/* 联系表单 */
.contact-form-wrapper .section-title {
  text-align: left;
}

.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,
.form-group select {
  width: 100%;
  padding: var(--spacing-17);
  border: 1px solid var(--color-platinum-frost);
  border-radius: var(--radius-sm);
  font-size: var(--text-body);
  background-color: var(--color-warm-linen);
  transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-terracotta-flame);
}

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

.contact-form .btn-primary {
  width: 100%;
}

/* 地图 */
.map-container {
  border-radius: var(--radius-images);
  overflow: hidden;
  border: 1px solid var(--color-platinum-frost);
}

/* ========================================
   图片占位符
   ======================================== */
.image-placeholder {
  background-color: var(--color-platinum-frost);
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-placeholder svg {
  width: 100%;
  height: 100%;
}

/* ========================================
   页脚
   ======================================== */
.footer {
  background-color: var(--surface-earth-umber-panel);
  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-section h4 {
  font-size: var(--text-body);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-20);
  color: var(--color-warm-linen);
}

.footer-section p {
  font-size: var(--text-body-sm);
  color: var(--color-pale-ochre);
  margin-bottom: var(--spacing-14);
}

.footer-section ul li {
  margin-bottom: var(--spacing-14);
}

.footer-section ul li a {
  font-size: var(--text-body-sm);
  color: var(--color-pale-ochre);
  transition: all 0.3s ease;
}

.footer-section ul li a:hover {
  color: var(--color-warm-linen);
  text-decoration: underline;
}

.footer-section > ul > li {
  font-size: var(--text-body-sm);
  color: var(--color-pale-ochre);
  margin-bottom: var(--spacing-14);
}

.social-links .social-icon {
  display: inline-block;
  padding: var(--spacing-10) var(--spacing-17);
  border: 1px solid var(--color-pale-ochre);
  border-radius: var(--radius-sm);
  font-size: var(--text-body-sm);
  color: var(--color-pale-ochre);
  margin-right: var(--spacing-10);
  transition: all 0.3s ease;
}

.social-links .social-icon:hover {
  background-color: var(--color-pale-ochre);
  color: var(--color-earth-umber);
}

.footer-bottom {
  padding-top: var(--spacing-30);
  border-top: 1px solid rgba(247, 239, 197, 0.2);
  text-align: center;
}

.footer-bottom p {
  font-size: var(--text-body-sm);
  color: var(--color-pale-ochre);
}

/* ========================================
   汉堡菜单按钮
   ======================================== */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  cursor: pointer;
  z-index: 1001;
  background: none;
  border: none;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-earth-umber);
  border-radius: 2px;
  transition: all 0.3s ease;
  position: relative;
}

.menu-toggle span:nth-child(1) { margin-bottom: 6px; }
.menu-toggle span:nth-child(3) { margin-top: 6px; }

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 6px);
}
.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}
.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -7px);
}

/* 移动端遮罩 */
.nav-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(60, 38, 28, 0.4);
  z-index: 998;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.nav-overlay.active {
  display: block;
  opacity: 1;
}

/* ========================================
   响应式设计 — 大屏桌面 (1440px+)
   ======================================== */
@media (min-width: 1440px) {
  .container {
    max-width: 1320px;
  }
}

/* ========================================
   响应式设计 — 小桌面 / 横屏平板 (1025px ~ 1200px)
   ======================================== */
@media (max-width: 1200px) and (min-width: 1025px) {
  .container {
    max-width: 960px;
  }

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

/* ========================================
   响应式设计 — 平板竖屏 (769px ~ 1024px)
   ======================================== */
@media (max-width: 1024px) {
  :root {
    --section-gap: 54px;
    --card-padding: 34px;
  }

  .container {
    max-width: 720px;
  }

  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-30);
  }

  .works-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-30);
  }

  .team-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-23);
  }

  .values-grid {
    gap: var(--spacing-30);
  }

  .footer-content {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-34);
  }

  .about-content {
    gap: var(--spacing-40);
  }

  .contact-content {
    gap: var(--spacing-45);
  }

  .hero-title {
    font-size: 40px;
  }
}

/* ========================================
   响应式设计 — 大手机 / 小平板竖屏 (601px ~ 768px)
   ======================================== */
@media (max-width: 768px) {
  :root {
    --text-display: 34px;
    --text-heading: 26px;
    --text-heading-sm: 22px;
    --section-gap: 45px;
    --card-padding: 28px;
    --tracking-display: 2px;
  }

  /* 导航栏：汉堡菜单 */
  .navbar {
    padding: var(--spacing-14) 0;
  }

  .navbar .container {
    position: relative;
  }

  .menu-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -280px;
    width: 280px;
    height: 100vh;
    height: 100dvh;
    background-color: var(--color-warm-linen);
    flex-direction: column;
    align-items: stretch;
    padding: 80px var(--spacing-30) var(--spacing-30);
    gap: 0;
    z-index: 999;
    transition: right 0.35s ease;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    box-shadow: -4px 0 20px rgba(60, 38, 28, 0.1);
  }

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

  .nav-links li {
    border-bottom: 1px solid var(--color-platinum-frost);
  }

  .nav-links a {
    display: block;
    padding: var(--spacing-17) var(--spacing-14);
    font-size: var(--text-body);
    border: none;
    border-radius: 0;
  }

  .nav-links a:hover,
  .nav-links a.active {
    border: none;
    color: var(--color-terracotta-flame);
    background-color: rgba(233, 116, 81, 0.06);
  }

  .navbar > .container > .btn-primary {
    display: none;
  }

  .nav-links .nav-cta-mobile {
    display: block;
    margin-top: var(--spacing-23);
    text-align: center;
    background-color: var(--color-terracotta-flame);
    color: var(--color-peach-cream);
    padding: var(--spacing-17) var(--spacing-30);
    border-radius: var(--radius-buttons);
    font-weight: var(--font-weight-medium);
  }

  /* Hero */
  .hero {
    min-height: 70vh;
    padding: var(--spacing-60) var(--spacing-23);
    margin-top: 60px;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-17);
  }

  .hero-buttons .btn-primary,
  .hero-buttons .btn-secondary {
    width: 100%;
    max-width: 300px;
  }

  /* 区块 */
  .about-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-34);
  }

  .about-text .section-title {
    text-align: center;
  }

  .work-detail-header {
    grid-template-columns: 1fr;
    gap: var(--spacing-34);
  }

  .work-detail-meta {
    grid-template-columns: 1fr 1fr;
  }

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

  /* 时间线 */
  .timeline::before {
    left: 20px;
  }

  .timeline-item {
    flex-direction: column !important;
    padding-left: 56px;
  }

  .timeline-year {
    text-align: left;
    margin-bottom: var(--spacing-10);
    font-size: var(--text-heading-sm);
  }

  .timeline-content {
    margin: 0;
  }

  .timeline-item::after {
    left: 14px;
  }

  /* 团队 */
  .team-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-20);
  }

  /* 联系 */
  .contact-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-45);
  }

  .contact-info .section-title,
  .contact-form-wrapper .section-title {
    text-align: center;
  }

  .social-links {
    flex-wrap: wrap;
    justify-content: center;
  }

  /* 页脚 */
  .footer-content {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-34);
  }

  .footer {
    padding: var(--spacing-45) 0 var(--spacing-23);
  }

  /* 页面标题 */
  .page-header {
    padding: calc(var(--spacing-60) + 60px) var(--spacing-23) var(--spacing-60);
  }

  /* 作品筛选 */
  .works-filter {
    gap: var(--spacing-10);
  }

  .filter-btn {
    padding: var(--spacing-10) var(--spacing-20);
    font-size: var(--text-body-sm);
  }
}

/* ========================================
   响应式设计 — 手机竖屏 (481px ~ 600px)
   ======================================== */
@media (max-width: 600px) {
  :root {
    --text-display: 30px;
    --text-heading: 24px;
    --text-heading-sm: 20px;
    --text-subheading: 18px;
    --text-body: 16px;
    --section-gap: 40px;
    --card-padding: 23px;
  }

  .container {
    padding: 0 var(--spacing-20);
  }

  .advantages-grid,
  .works-grid,
  .values-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-20);
  }

  .team-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-17);
  }

  .team-card {
    padding: var(--spacing-20);
  }

  .team-avatar {
    width: 80px;
    height: 80px;
  }

  .work-detail-meta {
    grid-template-columns: 1fr;
  }

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

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-30);
  }

  .contact-form {
    padding: var(--spacing-23);
  }

  .logo {
    font-size: var(--text-heading-sm);
  }
}

/* ========================================
   响应式设计 — 小手机 (≤ 480px)
   ======================================== */
@media (max-width: 480px) {
  :root {
    --text-display: 26px;
    --text-heading: 22px;
    --text-heading-sm: 18px;
    --tracking-display: 1px;
  }

  .hero {
    min-height: 60vh;
    padding: var(--spacing-45) var(--spacing-17);
  }

  .hero-subtitle {
    font-size: var(--text-body-sm);
  }

  .btn-primary,
  .btn-secondary {
    padding: var(--spacing-14) var(--spacing-23);
    font-size: var(--text-body-sm);
    width: 100%;
    text-align: center;
  }

  .page-header {
    padding: calc(var(--spacing-45) + 56px) var(--spacing-17) var(--spacing-45);
  }

  .section-title {
    margin-bottom: var(--spacing-30);
  }

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

  .works-filter {
    gap: var(--spacing-10);
  }

  .filter-btn {
    padding: 8px var(--spacing-14);
    font-size: var(--text-caption);
  }

  .contact-item {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .advantage-card {
    padding: var(--spacing-23);
  }

  .value-card {
    padding: var(--spacing-23);
  }
}

/* ========================================
   响应式设计 — 超小手机 (≤ 360px)
   ======================================== */
@media (max-width: 360px) {
  :root {
    --text-display: 22px;
    --text-heading: 20px;
    --text-body: 15px;
  }

  .container {
    padding: 0 var(--spacing-14);
  }

  .logo {
    font-size: 16px;
  }

  .nav-links {
    width: 240px;
    right: -240px;
  }

  .hero-buttons .btn-primary,
  .hero-buttons .btn-secondary {
    max-width: 100%;
    font-size: var(--text-caption);
  }
}

/* ========================================
   响应式设计 — 横屏手机
   ======================================== */
@media (max-height: 500px) and (orientation: landscape) {
  .hero {
    min-height: auto;
    padding: calc(var(--spacing-45) + 56px) var(--spacing-30) var(--spacing-45);
  }

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

  .page-header {
    padding: calc(var(--spacing-34) + 56px) var(--spacing-23) var(--spacing-34);
  }
}

/* ========================================
   安全区域适配 (刘海屏 / 底部手势条)
   ======================================== */
@supports (padding: env(safe-area-inset-top)) {
  .navbar {
    padding-top: calc(var(--spacing-17) + env(safe-area-inset-top));
  }

  .nav-links {
    padding-top: calc(80px + env(safe-area-inset-top));
    padding-bottom: calc(var(--spacing-30) + env(safe-area-inset-bottom));
  }

  .footer {
    padding-bottom: calc(var(--spacing-30) + env(safe-area-inset-bottom));
  }
}

/* ========================================
   触摸设备优化
   ======================================== */
@media (hover: none) and (pointer: coarse) {
  .nav-links a,
  .filter-btn,
  .btn-primary,
  .btn-secondary,
  .text-link,
  .social-link,
  .social-links .social-icon {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .work-card:hover {
    transform: none;
    box-shadow: none;
  }

  .advantage-card:hover,
  .value-card:hover,
  .team-card:hover {
    transform: none;
    box-shadow: none;
  }

  .work-card:active {
    opacity: 0.85;
    transition: opacity 0.1s;
  }

  .btn-primary:active,
  .btn-secondary:active {
    opacity: 0.8;
    transition: opacity 0.1s;
  }
}

/* ========================================
   高分辨率屏幕优化
   ======================================== */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }
}

/* ========================================
   暗色模式支持（可选）
   ======================================== */
@media (prefers-color-scheme: dark) {
  /* 保持当前浅色设计，不做自动切换 */
}

/* ========================================
   减少动画偏好
   ======================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ========================================
   打印样式
   ======================================== */
@media print {
  .navbar,
  .menu-toggle,
  .nav-overlay,
  .footer,
  .hero-buttons,
  .contact-form {
    display: none !important;
  }

  body {
    color: #000;
    background: #fff;
    font-size: 12pt;
  }

  .section {
    page-break-inside: avoid;
  }
}