@charset "UTF-8";

/* ==========================================================================
   【茶文化风】千问AI生活美学平台官方样式
   主题色彩：
     主色茶汤：#B8860B (浓酽澄澈琥珀黄)
     辅色汝窑青：#A8C3C9 (雨过天青润如玉)
     点缀茶烟灰：#9E9E9E (淡雅如烟舒缓自如)
     背景茶席白：#FAF5EB (温润绵柔茶席素白)
   核心意象：
     茶汤琥珀色渐变、汝窑开片纹理、茶烟袅袅升起、茶席布局疏朗有致
   ========================================================================== */

:root {
  --color-tea-soup: #B8860B;
  --color-tea-soup-light: #DAA520;
  --color-tea-soup-dark: #8B6508;
  --color-tea-amber: #C87A1E;
  --color-ru-celadon: #A8C3C9;
  --color-ru-celadon-light: #C4DCE0;
  --color-ru-celadon-dark: #70939A;
  --color-smoke-gray: #9E9E9E;
  --color-smoke-light: #E0E0E0;
  --color-tea-white: #FAF5EB;
  --color-tea-cream: #F3ECE0;
  --color-text-main: #332B24;
  --color-text-sub: #665C54;
  --color-text-muted: #8C827A;
  --border-celadon: rgba(168, 195, 201, 0.45);
  --border-tea: rgba(184, 134, 11, 0.35);
  --font-serif: "LXGW WenKai", "Source Han Serif SC", "Noto Serif CJK SC", "Songti SC", "SimSun", "STSong", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --shadow-tea: 0 10px 30px rgba(184, 134, 11, 0.08);
  --shadow-celadon: 0 12px 36px rgba(112, 147, 154, 0.12);
  --transition: all 0.35s 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-serif);
  background-color: var(--color-tea-white);
  color: var(--color-text-main);
  line-height: 1.8;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  /* 汝窑开片细腻纹理底色 */
  background-image: 
    radial-gradient(circle at 10% 15%, rgba(184, 134, 11, 0.04) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(168, 195, 201, 0.08) 0%, transparent 50%),
    linear-gradient(to bottom, #FAF5EB 0%, #F5EFE1 100%);
  background-attachment: fixed;
}

/* 汝窑开片细纹网 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(65deg, rgba(168, 195, 201, 0.04) 1px, transparent 1px),
    linear-gradient(-35deg, rgba(184, 134, 11, 0.03) 1px, transparent 1px);
  background-size: 50px 50px, 70px 70px;
  pointer-events: none;
  z-index: 0;
}

/* 茶烟袅袅动效容器 */
.tea-smoke-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
}

.tea-smoke {
  position: absolute;
  bottom: -40px;
  width: 140px;
  height: 280px;
  background: radial-gradient(ellipse at center, rgba(158, 158, 158, 0.12) 0%, rgba(168, 195, 201, 0.06) 40%, transparent 70%);
  filter: blur(16px);
  border-radius: 50%;
  animation: teaSmokeRise 14s infinite ease-in-out;
}

.tea-smoke:nth-child(1) {
  left: 12%;
  animation-duration: 16s;
  animation-delay: 0s;
}

.tea-smoke:nth-child(2) {
  left: 45%;
  width: 180px;
  height: 320px;
  animation-duration: 18s;
  animation-delay: 4s;
}

.tea-smoke:nth-child(3) {
  right: 15%;
  width: 130px;
  height: 260px;
  animation-duration: 13s;
  animation-delay: 2s;
}

@keyframes teaSmokeRise {
  0% {
    transform: translateY(0) scaleX(0.8) scaleY(0.9) skewX(0deg);
    opacity: 0;
  }
  20% {
    opacity: 0.65;
  }
  60% {
    transform: translateY(-50vh) scaleX(1.3) scaleY(1.4) skewX(12deg);
    opacity: 0.45;
  }
  100% {
    transform: translateY(-110vh) scaleX(1.8) scaleY(1.8) skewX(-15deg);
    opacity: 0;
  }
}

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 — 锚点菜单与下方功能模块一一对应
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 245, 235, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-celadon);
  box-shadow: 0 4px 20px rgba(112, 147, 154, 0.08);
  transition: var(--transition);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

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

.brand-logo img {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 2px solid var(--color-tea-soup);
  box-shadow: 0 0 12px rgba(184, 134, 11, 0.25);
  background: #fff;
  padding: 2px;
  object-fit: contain;
}

.brand-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-text-main);
  letter-spacing: 1.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-tag {
  font-size: 0.72rem;
  padding: 2px 7px;
  border-radius: 4px;
  background: linear-gradient(135deg, var(--color-tea-soup), var(--color-tea-soup-light));
  color: #fff;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 20px;
}

.nav-links a {
  font-size: 0.98rem;
  color: var(--color-text-sub);
  padding: 8px 12px;
  border-radius: 6px;
  transition: var(--transition);
  position: relative;
  letter-spacing: 0.8px;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-tea-soup), var(--color-ru-celadon));
  transition: var(--transition);
  transform: translateX(-50%);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-tea-soup-dark);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 80%;
}

/* ==========================================================================
   Hero 首屏 + 下载区 (零滚动即可转化)
   ========================================================================== */
.hero-section {
  padding: 40px 0 24px;
  text-align: center;
  position: relative;
}

.tea-cup-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 18px;
  background: rgba(168, 195, 201, 0.18);
  border: 1px solid var(--border-celadon);
  border-radius: 30px;
  color: var(--color-tea-soup-dark);
  font-size: 0.92rem;
  margin-bottom: 18px;
  letter-spacing: 1.5px;
  box-shadow: 0 4px 12px rgba(168, 195, 201, 0.15);
}

.hero-title {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--color-text-main);
  line-height: 1.35;
  margin-bottom: 14px;
  letter-spacing: 1.8px;
}

.hero-subtitle {
  font-size: 1.32rem;
  color: var(--color-tea-soup);
  font-weight: 600;
  margin-bottom: 14px;
  letter-spacing: 2.5px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
}

.hero-subtitle::before,
.hero-subtitle::after {
  content: "— ❖ —";
  font-size: 0.9rem;
  color: var(--color-ru-celadon-dark);
  opacity: 0.7;
}

.hero-desc {
  max-width: 860px;
  margin: 0 auto 30px;
  font-size: 1.05rem;
  color: var(--color-text-sub);
  line-height: 1.85;
}

/* 4 个并列下载入口卡片 */
.download-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 10px;
}

.download-card {
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--border-celadon);
  border-radius: 12px;
  padding: 24px 18px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-tea);
}

/* 汝窑开片冰裂角标装饰 */
.download-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-tea-soup), var(--color-ru-celadon));
  opacity: 0.8;
}

.download-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-tea-soup);
  box-shadow: var(--shadow-celadon);
  background: #ffffff;
}

.download-icon {
  font-size: 2.4rem;
  margin-bottom: 12px;
  display: inline-block;
  filter: drop-shadow(0 4px 8px rgba(184, 134, 11, 0.2));
}

.download-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 6px;
  letter-spacing: 1px;
}

.download-text {
  font-size: 0.86rem;
  color: var(--color-text-muted);
  margin-bottom: 18px;
  line-height: 1.5;
}

/* 茶席雅致按钮（茶汤流光 + 汝窑润泽） */
.btn-tea {
  display: inline-block;
  width: 100%;
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 1px;
  color: #fff;
  background: linear-gradient(135deg, var(--color-tea-soup) 0%, var(--color-tea-amber) 100%);
  box-shadow: 0 4px 14px rgba(184, 134, 11, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.2);
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

/* 茶汤注入水波纹动画 */
.btn-tea::after {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 10%, transparent 60%);
  opacity: 0;
  transform: scale(0.5);
  transition: transform 0.5s, opacity 0.5s;
}

.btn-tea:hover {
  background: linear-gradient(135deg, var(--color-tea-soup-light) 0%, var(--color-tea-soup-dark) 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(184, 134, 11, 0.4);
}

.btn-tea:hover::after {
  opacity: 1;
  transform: scale(1);
}

.btn-tea-secondary {
  background: rgba(168, 195, 201, 0.2);
  color: var(--color-tea-soup-dark);
  border: 1px solid var(--color-ru-celadon);
  box-shadow: none;
}

.btn-tea-secondary:hover {
  background: rgba(168, 195, 201, 0.35);
  color: var(--color-text-main);
  box-shadow: 0 4px 14px rgba(112, 147, 154, 0.2);
}

/* ==========================================================================
   茶席分割装饰（疏朗留白 + 汝窑釉面光）
   ========================================================================== */
.tea-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 48px auto;
  position: relative;
}

.tea-divider-line {
  height: 1px;
  flex: 1;
  background: linear-gradient(90deg, transparent, var(--border-celadon), transparent);
}

.tea-divider-badge {
  padding: 4px 16px;
  font-size: 0.88rem;
  color: var(--color-tea-soup-dark);
  background: #FAF5EB;
  border: 1px solid var(--border-celadon);
  border-radius: 20px;
  letter-spacing: 2px;
  box-shadow: 0 2px 8px rgba(168, 195, 201, 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
   ========================================================================== */
.feature-section {
  padding: 24px 0;
}

.feature-box {
  display: flex;
  align-items: center;
  gap: 48px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--border-celadon);
  border-radius: 16px;
  padding: 44px;
  box-shadow: var(--shadow-tea);
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

.feature-box:hover {
  border-color: var(--color-tea-soup);
  box-shadow: var(--shadow-celadon);
}

/* 汝窑天青冰裂边角纹理 */
.feature-box::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 120px;
  height: 120px;
  background: radial-gradient(circle at top right, rgba(168, 195, 201, 0.2) 0%, transparent 70%);
  pointer-events: none;
}

.feature-box.reverse {
  flex-direction: row-reverse;
}

.feature-content {
  flex: 1;
}

.module-tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(184, 134, 11, 0.12);
  color: var(--color-tea-soup-dark);
  font-size: 0.9rem;
  font-weight: 700;
  border-radius: 4px;
  border-left: 3px solid var(--color-tea-soup);
  margin-bottom: 12px;
  letter-spacing: 1.5px;
}

.feature-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text-main);
  line-height: 1.35;
  margin-bottom: 8px;
  letter-spacing: 1.2px;
}

.feature-subtitle {
  font-size: 1.05rem;
  color: var(--color-tea-soup);
  font-weight: 600;
  margin-bottom: 22px;
  letter-spacing: 1.5px;
}

.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-text-sub);
  line-height: 1.7;
}

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

.scenario-item strong {
  color: var(--color-text-main);
  font-weight: 600;
}

.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: 12px;
  border: 1px solid var(--border-celadon);
  box-shadow: 0 8px 24px rgba(112, 147, 154, 0.15);
  transition: var(--transition);
  background-color: #fff;
  object-fit: cover;
}

.feature-box:hover .feature-media img {
  transform: scale(1.02);
  border-color: var(--color-tea-soup);
  box-shadow: 0 12px 32px rgba(184, 134, 11, 0.18);
}

/* ==========================================================================
   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 48px;
}

.web-entry-banner {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(243, 236, 224, 0.9) 100%);
  border: 1px solid var(--border-tea);
  border-radius: 16px;
  padding: 48px 36px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-tea);
}

.web-entry-banner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, var(--color-tea-soup), var(--color-ru-celadon), var(--color-tea-soup));
}

.web-entry-title {
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 14px;
  letter-spacing: 1.5px;
}

.web-entry-desc {
  max-width: 820px;
  margin: 0 auto 28px;
  font-size: 1.05rem;
  color: var(--color-text-sub);
  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: rgba(255, 255, 255, 0.95);
  border: 1px solid var(--border-celadon);
  border-radius: 14px;
  padding: 24px;
  box-shadow: var(--shadow-tea);
}

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

.chat-input {
  flex: 1;
  padding: 14px 20px;
  border-radius: 8px;
  border: 1px solid var(--border-celadon);
  background: #FAF5EB;
  color: var(--color-text-main);
  font-family: inherit;
  font-size: 1rem;
  transition: var(--transition);
}

.chat-input:focus {
  outline: none;
  border-color: var(--color-tea-soup);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(184, 134, 11, 0.15);
}

.chat-input-row .btn-tea {
  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: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--border-celadon);
  border-radius: 12px;
  padding: 28px 22px;
  text-align: center;
  box-shadow: var(--shadow-tea);
}

.web-step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(184, 134, 11, 0.15);
  color: var(--color-tea-soup-dark);
  font-weight: 700;
  font-size: 1.2rem;
  margin-bottom: 14px;
}

.web-step-title {
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 10px;
}

.web-step-desc {
  font-size: 0.92rem;
  color: var(--color-text-sub);
  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: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--border-celadon);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-tea);
  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-text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  letter-spacing: 0.8px;
}

.faq-question::after {
  content: "▾";
  font-size: 1.2rem;
  color: var(--color-tea-soup);
  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-text-sub);
  line-height: 1.8;
  border-top: 1px solid rgba(168, 195, 201, 0.2);
  padding-top: 14px;
}

/* ==========================================================================
   页脚规范
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border-celadon);
  background: rgba(243, 236, 224, 0.8);
  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: 0.92rem;
  color: var(--color-text-sub);
  transition: var(--transition);
}

.footer-nav a:hover {
  color: var(--color-tea-soup-dark);
}

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

/* ==========================================================================
   响应式断点适配
   ========================================================================== */
@media (max-width: 992px) {
  .download-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .feature-box,
  .feature-box.reverse {
    flex-direction: column;
    padding: 32px 24px;
    gap: 32px;
  }
  .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: 8px 12px;
  }
  .hero-title {
    font-size: 1.65rem;
  }
  .hero-subtitle {
    font-size: 1.1rem;
  }
  .download-grid {
    grid-template-columns: 1fr;
  }
  .web-entry-actions {
    flex-direction: column;
  }
  .chat-input-row {
    flex-direction: column;
  }
  .chat-input-row .btn-tea {
    width: 100%;
  }
}