@charset "UTF-8";

/* ==========================================================================
   【竹简风】千问AI古籍数字化平台官方样式
   色彩体系：
     主色竹黄：#C9A96E (温润挺拔简牍黄竹)
     辅色编绳褐：#6D4C41 (麻编棕褐古索连简)
     点缀墨迹：#3E2723 (沉凝古墨焦墨刀刻)
     背景绢黄：#F0E6D2 (古朴老绢澄心素底)
   核心意象：
     竹黄色简牍纵向排列、麻编绳串联、刀刻金石质感、编绳悬垂晃动、卷轴徐舒
   ========================================================================== */

:root {
  --color-bamboo: #C9A96E;
  --color-bamboo-light: #DFC28E;
  --color-bamboo-dark: #A68446;
  --color-bamboo-strip: #D8BD85;
  --color-rope: #6D4C41;
  --color-rope-dark: #4E342E;
  --color-rope-light: #8D6E63;
  --color-ink: #3E2723;
  --color-ink-deep: #211512;
  --color-ink-light: #5D4037;
  --color-silk: #F0E6D2;
  --color-silk-light: #F7F1E3;
  --color-silk-dark: #E2D4BC;
  --border-rope: rgba(109, 76, 65, 0.45);
  --border-bamboo: rgba(201, 169, 110, 0.55);
  --font-lishu: "LiSu", "SimLi", "LXGW WenKai", "Source Han Serif SC", serif;
  --font-kai: "LXGW WenKai", "Kaiti SC", "STKaiti", "KaiTi", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --shadow-slip: 0 10px 30px rgba(78, 52, 46, 0.12);
  --shadow-rope: 0 6px 18px rgba(109, 76, 65, 0.25);
  --transition: all 0.38s cubic-bezier(0.25, 1, 0.5, 1);
}

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

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

body {
  font-family: var(--font-kai);
  background-color: var(--color-silk);
  color: var(--color-ink);
  line-height: 1.85;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  /* 绢丝古织纹与老绢微黄底色 */
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(201, 169, 110, 0.2) 0%, transparent 45%),
    radial-gradient(circle at 85% 85%, rgba(109, 76, 65, 0.15) 0%, transparent 50%),
    linear-gradient(135deg, #F5EDE0 0%, #F0E6D2 50%, #E9DCBF 100%);
  background-attachment: fixed;
}

/* 绢帛经纬细丝纹 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: 
    repeating-linear-gradient(
      0deg,
      rgba(109, 76, 65, 0.025) 0px,
      rgba(109, 76, 65, 0.025) 1px,
      transparent 1px,
      transparent 16px
    ),
    repeating-linear-gradient(
      90deg,
      rgba(201, 169, 110, 0.035) 0px,
      rgba(201, 169, 110, 0.035) 1px,
      transparent 1px,
      transparent 24px
    );
  pointer-events: none;
  z-index: 0;
}

/* 悬垂编绳动效装饰层 */
.rope-dangle-layer {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 100vh;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
}

.rope-cord {
  position: absolute;
  top: -20px;
  width: 4px;
  height: 140px;
  background: repeating-linear-gradient(
    to bottom,
    var(--color-rope) 0px,
    var(--color-rope) 8px,
    var(--color-rope-dark) 8px,
    var(--color-rope-dark) 12px
  );
  border-radius: 2px;
  box-shadow: 2px 4px 10px rgba(78, 52, 46, 0.2);
  transform-origin: top center;
  animation: ropeSwing 8s infinite ease-in-out;
}

.rope-cord::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: -4px;
  width: 12px;
  height: 12px;
  background: var(--color-bamboo-dark);
  border-radius: 50%;
  border: 2px solid var(--color-rope-dark);
}

.rope-cord:nth-child(1) {
  left: 4%;
  height: 180px;
  animation-duration: 9s;
}

.rope-cord:nth-child(2) {
  left: 8%;
  height: 110px;
  animation-duration: 7s;
  animation-delay: 1.5s;
}

.rope-cord:nth-child(3) {
  right: 5%;
  height: 160px;
  animation-duration: 8.5s;
  animation-delay: 0.8s;
}

.rope-cord:nth-child(4) {
  right: 9%;
  height: 125px;
  animation-duration: 7.8s;
  animation-delay: 2.2s;
}

@keyframes ropeSwing {
  0% { transform: rotate(0deg); }
  25% { transform: rotate(2.5deg); }
  50% { transform: rotate(-2deg); }
  75% { transform: rotate(1.2deg); }
  100% { transform: rotate(0deg); }
}

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

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

/* ==========================================================================
   顶部导航 — 竹简横贯梁，锚点菜单一一对应
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(240, 230, 210, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 3px solid var(--color-rope);
  box-shadow: 0 6px 20px rgba(78, 52, 46, 0.15);
  transition: var(--transition);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 78px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-logo img {
  width: 44px;
  height: 44px;
  border-radius: 6px;
  border: 2px solid var(--color-rope);
  box-shadow: 0 2px 10px rgba(109, 76, 65, 0.25);
  background: #fff;
  padding: 2px;
  object-fit: contain;
}

.brand-title {
  font-family: var(--font-lishu);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-ink-deep);
  letter-spacing: 2px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-tag {
  font-family: var(--font-kai);
  font-size: 0.72rem;
  padding: 2px 7px;
  border-radius: 3px;
  background: var(--color-rope);
  color: var(--color-silk-light);
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 8px;
}

.nav-links li {
  position: relative;
}

.nav-links a {
  display: inline-block;
  padding: 8px 14px;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--color-ink);
  border-radius: 4px;
  transition: var(--transition);
  position: relative;
  letter-spacing: 1px;
}

/* 编绳竖纹节点 */
.nav-links a::before {
  content: "";
  position: absolute;
  top: 25%;
  bottom: 25%;
  left: 0;
  width: 1px;
  background: var(--border-rope);
}

.nav-links li:first-child a::before {
  display: none;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-rope-dark);
  background: rgba(201, 169, 110, 0.25);
  transform: translateY(-1px);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 15%;
  width: 70%;
  height: 2px;
  background: var(--color-rope);
}

/* ==========================================================================
   Hero 首屏 + 下载区 (零滚动即可转化，简牍横陈)
   ========================================================================== */
.hero-section {
  padding: 38px 0 24px;
  text-align: center;
  position: relative;
}

.bamboo-seal-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 22px;
  background: var(--color-silk-light);
  border: 1px solid var(--border-rope);
  border-radius: 30px;
  color: var(--color-rope-dark);
  font-size: 0.94rem;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: 2px;
  box-shadow: 0 4px 14px rgba(109, 76, 65, 0.12);
}

.bamboo-seal-badge span {
  color: var(--color-bamboo-dark);
}

.hero-title {
  font-family: var(--font-lishu);
  font-size: 2.15rem;
  font-weight: 700;
  color: var(--color-ink-deep);
  line-height: 1.35;
  margin-bottom: 14px;
  letter-spacing: 2px;
  text-shadow: 1px 1px 1px rgba(255, 255, 255, 0.7);
}

.hero-subtitle {
  font-size: 1.34rem;
  color: var(--color-rope);
  font-weight: 700;
  margin-bottom: 14px;
  letter-spacing: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.hero-subtitle::before,
.hero-subtitle::after {
  content: "— 韦编三绝 · 简册垂光 —";
  font-size: 0.88rem;
  color: var(--color-bamboo-dark);
  font-weight: 500;
  opacity: 0.85;
}

.hero-desc {
  max-width: 860px;
  margin: 0 auto 30px;
  font-size: 1.08rem;
  color: var(--color-ink);
  line-height: 1.85;
}

/* 并列 4 个下载入口卡片（竹简竖片排布） */
.download-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 8px;
}

.download-card {
  background: linear-gradient(to bottom, #E8D3A8 0%, #D8BD85 50%, #C9A96E 100%);
  border: 1px solid var(--border-rope);
  border-radius: 8px;
  padding: 24px 16px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-slip);
}

/* 简牍贯穿编绳双道 */
.download-card::before,
.download-card::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 4px;
  background: repeating-linear-gradient(
    90deg,
    var(--color-rope) 0px,
    var(--color-rope) 6px,
    var(--color-rope-dark) 6px,
    var(--color-rope-dark) 10px
  );
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.download-card::before {
  top: 10px;
}

.download-card::after {
  bottom: 10px;
}

.download-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-rope-dark);
  box-shadow: 0 14px 34px rgba(78, 52, 46, 0.25);
  background: linear-gradient(to bottom, #EFE0BD 0%, #DFC28E 50%, #D0B27A 100%);
}

.download-icon {
  font-size: 2.3rem;
  margin-bottom: 10px;
  display: inline-block;
  filter: drop-shadow(0 2px 4px rgba(78, 52, 46, 0.2));
}

.download-title {
  font-family: var(--font-lishu);
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--color-ink-deep);
  margin-bottom: 6px;
  letter-spacing: 1.2px;
}

.download-text {
  font-size: 0.88rem;
  color: var(--color-ink-light);
  margin-bottom: 18px;
  line-height: 1.5;
}

/* 刀刻墨印质感按钮 */
.btn-bamboo {
  display: inline-block;
  width: 100%;
  padding: 10px 16px;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--color-silk-light);
  background: linear-gradient(135deg, var(--color-rope) 0%, var(--color-rope-dark) 100%);
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: var(--shadow-rope);
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.btn-bamboo::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(201, 169, 110, 0.35), transparent);
  transition: 0.5s;
}

.btn-bamboo:hover {
  background: linear-gradient(135deg, var(--color-rope-light) 0%, var(--color-rope) 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(78, 52, 46, 0.35);
}

.btn-bamboo:hover::after {
  left: 100%;
}

.btn-bamboo-secondary {
  background: var(--color-silk-light);
  color: var(--color-rope-dark);
  border: 1px solid var(--color-rope);
  box-shadow: none;
}

.btn-bamboo-secondary:hover {
  background: var(--color-bamboo-light);
  color: var(--color-ink-deep);
  border-color: var(--color-rope-dark);
}

/* ==========================================================================
   竹简编绳分割线（连缀古索）
   ========================================================================== */
.bamboo-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 46px auto;
  position: relative;
}

.bamboo-divider-rope {
  height: 3px;
  flex: 1;
  background: repeating-linear-gradient(
    90deg,
    var(--color-rope) 0px,
    var(--color-rope) 8px,
    var(--color-rope-dark) 8px,
    var(--color-rope-dark) 14px
  );
  opacity: 0.6;
}

.bamboo-divider-knot {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 18px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-rope-dark);
  background: var(--color-silk-light);
  border: 1px solid var(--border-rope);
  border-radius: 20px;
  letter-spacing: 2px;
  box-shadow: 0 2px 10px rgba(78, 52, 46, 0.1);
}

/* ==========================================================================
   四个功能模块统一版式：模块名 + 情绪化短标题 + 场景化功能点
   竹简卷动展开卡片 (bamboo-scroll)
   ========================================================================== */
.feature-section {
  padding: 24px 0;
}

.bamboo-scroll {
  display: flex;
  align-items: center;
  gap: 48px;
  background: linear-gradient(135deg, rgba(247, 241, 227, 0.95) 0%, rgba(240, 230, 210, 0.95) 100%);
  border: 2px solid var(--border-rope);
  border-radius: 12px;
  padding: 42px;
  box-shadow: var(--shadow-slip);
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

/* 竹简左右轴边饰 */
.bamboo-scroll::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 8px;
  background: linear-gradient(to right, var(--color-rope-dark), var(--color-rope));
}

.bamboo-scroll::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  width: 8px;
  background: linear-gradient(to left, var(--color-rope-dark), var(--color-rope));
}

.bamboo-scroll:hover {
  border-color: var(--color-rope-dark);
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(78, 52, 46, 0.2);
}

.bamboo-scroll.reverse {
  flex-direction: row-reverse;
}

.feature-content {
  flex: 1;
}

.module-tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(109, 76, 65, 0.15);
  color: var(--color-rope-dark);
  font-size: 0.92rem;
  font-weight: 700;
  border-radius: 4px;
  border-left: 3px solid var(--color-rope);
  margin-bottom: 12px;
  letter-spacing: 1.5px;
}

.feature-title {
  font-family: var(--font-lishu);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-ink-deep);
  line-height: 1.35;
  margin-bottom: 8px;
  letter-spacing: 1.5px;
}

.feature-subtitle {
  font-size: 1.05rem;
  color: var(--color-rope);
  font-weight: 700;
  margin-bottom: 22px;
  letter-spacing: 1.8px;
}

.scenario-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.scenario-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.98rem;
  color: var(--color-ink);
  line-height: 1.75;
}

.scenario-bullet {
  color: var(--color-rope);
  font-size: 1.1rem;
  line-height: 1.6;
}

.scenario-item strong {
  color: var(--color-ink-deep);
  font-weight: 700;
}

.feature-media {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.feature-media img {
  width: 100%;
  max-width: 520px;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--border-rope);
  box-shadow: 0 8px 26px rgba(78, 52, 46, 0.18);
  transition: var(--transition);
  background-color: #fff;
  object-fit: cover;
}

.bamboo-scroll:hover .feature-media img {
  transform: scale(1.02);
  border-color: var(--color-rope);
}

/* ==========================================================================
   网页版入口 — 零安装兜底，承接不愿下载的用户
   ========================================================================== */
.web-entry-section {
  padding: 32px 0 46px;
}

.web-entry-banner {
  background: linear-gradient(135deg, #F7F1E3 0%, #E8D3A8 100%);
  border: 2px solid var(--color-rope);
  border-radius: 14px;
  padding: 46px 36px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-slip);
}

.web-entry-banner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background: repeating-linear-gradient(
    90deg,
    var(--color-rope) 0px,
    var(--color-rope) 10px,
    var(--color-rope-dark) 10px,
    var(--color-rope-dark) 18px
  );
}

.web-entry-title {
  font-family: var(--font-lishu);
  font-size: 1.88rem;
  font-weight: 700;
  color: var(--color-ink-deep);
  margin-bottom: 14px;
  letter-spacing: 1.8px;
}

.web-entry-desc {
  max-width: 820px;
  margin: 0 auto 28px;
  font-size: 1.05rem;
  color: var(--color-ink);
  line-height: 1.8;
}

.web-entry-actions {
  display: flex;
  justify-content: center;
  gap: 20px;
  max-width: 440px;
  margin: 0 auto;
}

/* ==========================================================================
   网页版专属内容区 (web.html)
   ========================================================================== */
.chat-preview-box {
  max-width: 840px;
  margin: 32px auto 0;
  background: var(--color-silk-light);
  border: 1px solid var(--border-rope);
  border-radius: 10px;
  padding: 24px;
  box-shadow: var(--shadow-slip);
}

.chat-input-row {
  display: flex;
  gap: 12px;
}

.chat-input {
  flex: 1;
  padding: 14px 20px;
  border-radius: 6px;
  border: 1px solid var(--border-rope);
  background: #fff;
  color: var(--color-ink-deep);
  font-family: inherit;
  font-size: 1rem;
  transition: var(--transition);
}

.chat-input:focus {
  outline: none;
  border-color: var(--color-rope-dark);
  box-shadow: 0 0 0 3px rgba(109, 76, 65, 0.18);
}

.chat-input-row .btn-bamboo {
  width: auto;
  white-space: nowrap;
  padding: 14px 28px;
}

.web-steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.web-step-card {
  background: linear-gradient(to bottom, #FAF5EA 0%, #EFE3CA 100%);
  border: 1px solid var(--border-rope);
  border-radius: 10px;
  padding: 28px 22px;
  text-align: center;
  box-shadow: var(--shadow-slip);
  position: relative;
}

.web-step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(109, 76, 65, 0.15);
  color: var(--color-rope-dark);
  font-weight: 700;
  font-size: 1.25rem;
  margin-bottom: 14px;
  border: 1px solid var(--border-rope);
}

.web-step-title {
  font-family: var(--font-lishu);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-ink-deep);
  margin-bottom: 10px;
}

.web-step-desc {
  font-size: 0.92rem;
  color: var(--color-ink-light);
  line-height: 1.7;
}

/* ==========================================================================
   帮助中心专属内容区 (help.html)
   ========================================================================== */
.help-hero {
  text-align: center;
  padding: 40px 0 20px;
}

.faq-list {
  max-width: 900px;
  margin: 30px auto 48px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--color-silk-light);
  border: 1px solid var(--border-rope);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--shadow-slip);
  transition: var(--transition);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 18px 24px;
  background: none;
  border: none;
  font-family: inherit;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-ink-deep);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  letter-spacing: 0.8px;
}

.faq-question::after {
  content: "▼";
  font-size: 0.85rem;
  color: var(--color-rope);
  transition: var(--transition);
}

.faq-item.active .faq-question::after {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 24px 20px;
  font-size: 0.98rem;
  color: var(--color-ink);
  line-height: 1.8;
  border-top: 1px solid rgba(109, 76, 65, 0.2);
  padding-top: 14px;
}

/* ==========================================================================
   页脚规范
   ========================================================================== */
.site-footer {
  border-top: 3px solid var(--color-rope);
  background: var(--color-silk-light);
  padding: 36px 0;
  text-align: center;
  margin-top: 40px;
}

.footer-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
  list-style: none;
  margin-bottom: 16px;
}

.footer-nav a {
  font-size: 0.94rem;
  color: var(--color-rope-dark);
  transition: var(--transition);
}

.footer-nav a:hover {
  color: var(--color-ink-deep);
}

.footer-copy {
  font-size: 0.86rem;
  color: var(--color-ink-light);
}

/* ==========================================================================
   响应式断点适配
   ========================================================================== */
@media (max-width: 992px) {
  .download-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .bamboo-scroll,
  .bamboo-scroll.reverse {
    flex-direction: column;
    padding: 32px 22px;
    gap: 30px;
  }
  .feature-media img {
    max-width: 100%;
  }
  .web-steps-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-inner {
    flex-direction: column;
    height: auto;
    padding: 16px 0;
    gap: 12px;
  }
  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px 10px;
  }
  .hero-title {
    font-size: 1.6rem;
  }
  .hero-subtitle {
    font-size: 1.1rem;
    flex-direction: column;
    gap: 6px;
  }
  .hero-subtitle::before,
  .hero-subtitle::after {
    display: none;
  }
  .download-grid {
    grid-template-columns: 1fr;
  }
  .web-entry-actions {
    flex-direction: column;
  }
  .chat-input-row {
    flex-direction: column;
  }
  .chat-input-row .btn-bamboo {
    width: 100%;
  }
}