/* ==========================================================================
   尧图网页设计 - 全站基础样式
   风格：茶叶轻奢风 · 金棕 + 墨绿 + 米白
   布局：侧边长效信息栏常驻 + 主内容区曲线无缝衔接
   ========================================================================== */

/* ---------- 设计变量 ---------- */
:root {
  /* 主色：金棕系（茶汤色） */
  --brown: #A8824A;
  --brown-deep: #6B4A2E;
  --brown-soft: #C9A47A;
  --brown-ink: #3F2D1B;

  /* 墨绿系（茶叶色，强调色） */
  --green: #2F5D3A;
  --green-deep: #1F3D27;
  --green-soft: #4A7D52;
  --green-mist: #6B9A6E;

  /* 米白系（宣纸色，背景） */
  --cream: #F5F1E8;
  --cream-2: #EDE6D6;
  --cream-3: #E2D8C2;

  /* 茶金系（点缀高光） */
  --gold: #C9A961;
  --gold-soft: #E8D9A8;
  --gold-deep: #A8862E;

  /* 中性 */
  --ink: #2B2418;
  --body: #5C4F3A;
  --muted: #8A7A60;
  --line: #DDD2BA;
  --white: #ffffff;

  /* 阴影 */
  --shadow-sm: 0 2px 10px rgba(63, 45, 27, 0.07);
  --shadow-md: 0 10px 32px rgba(63, 45, 27, 0.12);
  --shadow-lg: 0 24px 58px rgba(63, 45, 27, 0.16);
  --shadow-green: 0 10px 32px rgba(31, 61, 39, 0.18);

  /* 圆角 */
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 24px;
  --r-pill: 999px;

  /* 布局尺寸 */
  --side-w: 300px;
  --main-max: 1240px;

  /* 字体 */
  --font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-en: "Georgia", "Times New Roman", serif;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  color: var(--body);
  background: var(--cream);
  line-height: 1.75;
  font-size: 15px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--brown-deep);
  text-decoration: none;
  transition: color 0.28s ease;
}

a:hover {
  color: var(--green);
}

ul,
ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--ink);
  font-weight: 700;
  line-height: 1.3;
}

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

::selection {
  background: var(--gold-soft);
  color: var(--brown-ink);
}

/* ==========================================================================
   布局：侧边栏 + 主内容区
   ========================================================================== */
.layout {
  display: flex;
  min-height: 100vh;
}

/* ---------- 侧边长效信息栏（常驻置顶） ---------- */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--side-w);
  height: 100vh;
  background: linear-gradient(180deg, #1F3D27 0%, #2F5D3A 60%, #3F2D1B 100%);
  border-right: 1px solid rgba(201, 169, 97, 0.25);
  display: flex;
  flex-direction: column;
  z-index: 100;
  overflow-y: auto;
}

.sidebar::-webkit-scrollbar {
  width: 4px;
}
.sidebar::-webkit-scrollbar-thumb {
  background: var(--gold);
  border-radius: 4px;
}

.side-brand {
  padding: 32px 28px 22px;
  border-bottom: 1px solid rgba(232, 217, 168, 0.18);
}

.side-brand .logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.side-brand .logo-mark {
  width: 46px;
  height: 46px;
  flex-shrink: 0;
}

.side-brand .logo-text {
  display: flex;
  flex-direction: column;
}

.side-brand .logo-text strong {
  font-size: 20px;
  color: #F5F1E8;
  letter-spacing: 1px;
}

.side-brand .logo-text span {
  font-size: 10.5px;
  color: var(--gold-soft);
  letter-spacing: 2px;
  text-transform: uppercase;
  font-family: var(--font-en);
}

.side-brand .brand-slogan {
  margin-top: 16px;
  font-size: 12.5px;
  color: rgba(245, 241, 232, 0.72);
  line-height: 1.75;
  padding-left: 12px;
  border-left: 2px solid var(--gold);
}

/* ---------- 侧边导航 ---------- */
.side-nav {
  padding: 18px 16px;
  flex: 1;
}

.side-nav .nav-group {
  margin-bottom: 4px;
}

.side-nav .nav-label {
  font-size: 11px;
  color: var(--gold-soft);
  letter-spacing: 3px;
  padding: 14px 12px 6px;
  text-transform: uppercase;
  font-family: var(--font-en);
  opacity: 0.7;
}

.side-nav a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 11px 14px;
  border-radius: var(--r-sm);
  color: rgba(245, 241, 232, 0.85);
  font-size: 14.5px;
  font-weight: 500;
  transition: all 0.25s ease;
  position: relative;
}

.side-nav a .en {
  font-size: 10.5px;
  color: rgba(232, 217, 168, 0.6);
  font-family: var(--font-en);
  letter-spacing: 1px;
  opacity: 0.8;
}

.side-nav a:hover {
  background: rgba(201, 169, 97, 0.14);
  color: #fff;
  transform: translateX(4px);
}

.side-nav a.active {
  background: linear-gradient(135deg, var(--gold) 0%, var(--gold-deep) 100%);
  color: var(--brown-ink);
  box-shadow: 0 4px 14px rgba(201, 169, 97, 0.35);
}

.side-nav a.active .en {
  color: rgba(63, 45, 27, 0.7);
}

/* 有子菜单 */
.side-nav .has-sub > a::after {
  content: "+";
  font-size: 16px;
  color: var(--gold-soft);
  transition: transform 0.3s ease;
}

.side-nav .has-sub.open > a::after {
  transform: rotate(45deg);
}

.side-nav .sub {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
  padding-left: 14px;
}

.side-nav .has-sub.open .sub {
  max-height: 700px;
}

.side-nav .sub a {
  font-size: 13.5px;
  padding: 8px 12px;
  color: rgba(245, 241, 232, 0.62);
}

.side-nav .sub a::before {
  content: "·";
  margin-right: 8px;
  color: var(--gold);
}

.side-nav .sub a:hover {
  color: var(--gold-soft);
}

/* ---------- 侧边底部：核心信息常驻 ---------- */
.side-foot {
  padding: 22px 26px 26px;
  border-top: 1px solid rgba(232, 217, 168, 0.18);
  background: rgba(0, 0, 0, 0.18);
}

.side-foot .hot-line {
  font-size: 11px;
  color: var(--gold-soft);
  letter-spacing: 2px;
  margin-bottom: 4px;
  opacity: 0.8;
}

.side-foot .hot-num {
  font-size: 22px;
  font-weight: 700;
  color: #F5F1E8;
  font-family: var(--font-en);
  letter-spacing: 1px;
}

.side-foot .side-cta {
  display: block;
  margin-top: 14px;
  text-align: center;
  padding: 11px;
  border-radius: var(--r-pill);
  background: linear-gradient(135deg, var(--gold) 0%, var(--gold-deep) 100%);
  color: var(--brown-ink);
  font-weight: 600;
  font-size: 14px;
  box-shadow: 0 4px 14px rgba(201, 169, 97, 0.3);
  transition: all 0.3s ease;
}

.side-foot .side-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(201, 169, 97, 0.45);
  color: var(--brown-ink);
}

.side-foot .side-meta {
  margin-top: 14px;
  font-size: 11.5px;
  color: rgba(245, 241, 232, 0.55);
  line-height: 1.8;
}

/* ---------- 主内容区 ---------- */
.main {
  margin-left: var(--side-w);
  flex: 1;
  min-width: 0;
}

/* ---------- 顶部移动端栏（默认隐藏） ---------- */
.mobile-bar {
  display: none;
}

.hamburger {
  display: none;
}

/* ==========================================================================
   通用组件
   ========================================================================== */

/* ---------- 容器 ---------- */
.container {
  width: 100%;
  max-width: var(--main-max);
  margin: 0 auto;
  padding: 0 40px;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: var(--r-pill);
  font-size: 14.5px;
  font-weight: 600;
  transition: all 0.3s ease;
  cursor: pointer;
  letter-spacing: 0.5px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--brown) 0%, var(--brown-deep) 100%);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  color: #fff;
}

.btn-green {
  background: linear-gradient(135deg, var(--green) 0%, var(--green-deep) 100%);
  color: #fff;
  box-shadow: 0 4px 14px rgba(31, 61, 39, 0.25);
}

.btn-green:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-green);
  color: #fff;
}

.btn-gold {
  background: linear-gradient(135deg, var(--gold) 0%, var(--gold-deep) 100%);
  color: var(--brown-ink);
  box-shadow: 0 4px 14px rgba(201, 169, 97, 0.3);
}

.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(201, 169, 97, 0.4);
  color: var(--brown-ink);
}

.btn-ghost {
  background: transparent;
  color: var(--brown-deep);
  border: 1.5px solid var(--brown-soft);
}

.btn-ghost:hover {
  background: var(--brown-deep);
  color: #fff;
  border-color: var(--brown-deep);
}

.btn-ghost-green {
  background: transparent;
  color: var(--green);
  border: 1.5px solid var(--green-mist);
}

.btn-ghost-green:hover {
  background: var(--green);
  color: #fff;
  border-color: var(--green);
}

/* ---------- 区块标题 ---------- */
.sec-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 54px;
}

.sec-head .eyebrow {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 4px;
  color: var(--green);
  text-transform: uppercase;
  font-family: var(--font-en);
  margin-bottom: 14px;
  padding: 4px 16px;
  background: rgba(74, 125, 82, 0.12);
  border-radius: var(--r-pill);
}

.sec-head h2 {
  font-size: 36px;
  color: var(--ink);
  margin-bottom: 16px;
  letter-spacing: 1px;
}

.sec-head h2 .accent {
  color: var(--brown);
  position: relative;
}

.sec-head h2 .accent::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 2px;
  width: 100%;
  height: 8px;
  background: var(--gold-soft);
  z-index: -1;
  border-radius: 4px;
}

.sec-head p {
  color: var(--muted);
  font-size: 15.5px;
}

.sec-head.left {
  text-align: left;
  margin-left: 0;
}

/* ---------- 通用 section 与曲线无缝衔接 ---------- */
.section {
  padding: 90px 0;
  position: relative;
}

.section.tight {
  padding: 60px 0;
}

.bg-cream {
  background: var(--cream-2);
}

.bg-green {
  background: linear-gradient(180deg, var(--green-deep) 0%, var(--green) 100%);
  color: var(--cream);
}

.bg-green h2,
.bg-green h3 {
  color: #fff;
}

.bg-green p {
  color: rgba(245, 241, 232, 0.78);
}

.bg-green .sec-head .eyebrow {
  color: var(--gold-soft);
  background: rgba(232, 217, 168, 0.15);
}

.bg-green .sec-head h2 {
  color: #fff;
}

.bg-green .sec-head p {
  color: rgba(245, 241, 232, 0.72);
}

.bg-gold {
  background: linear-gradient(180deg, var(--gold-soft) 0%, var(--cream) 100%);
}

.bg-deep {
  background: linear-gradient(135deg, var(--brown-ink) 0%, var(--brown-deep) 100%);
  color: var(--cream);
}

.bg-deep h2,
.bg-deep h3 {
  color: #fff;
}

.bg-deep p {
  color: rgba(245, 241, 232, 0.75);
}

/* 曲线无缝衔接：上凸弧 */
.curve-top {
  padding-top: 130px;
}

.curve-top::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 90px;
  background: inherit;
  border-radius: 50% 50% 0 0 / 100% 100% 0 0;
  z-index: 0;
}

.curve-top > .container {
  position: relative;
  z-index: 1;
}

/* 曲线无缝衔接：下凹弧 */
.curve-bottom {
  padding-bottom: 130px;
}

.curve-bottom::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 90px;
  background: inherit;
  border-radius: 0 0 50% 50% / 0 0 100% 100%;
  z-index: 0;
}

.curve-bottom > .container {
  position: relative;
  z-index: 1;
}

/* 曲线无缝衔接：上下双弧 */
.curve-both {
  padding-top: 130px;
  padding-bottom: 130px;
}

.curve-both::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 90px;
  background: inherit;
  border-radius: 50% 50% 0 0 / 100% 100% 0 0;
  z-index: 0;
}

.curve-both::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 90px;
  background: inherit;
  border-radius: 0 0 50% 50% / 0 0 100% 100%;
  z-index: 0;
}

.curve-both > .container {
  position: relative;
  z-index: 1;
}

/* 斜切衔接 */
.skew-top {
  margin-top: -60px;
  padding-top: 120px;
  border-radius: 40px 40px 0 0;
  position: relative;
  z-index: 2;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding: 22px 0;
  font-size: 13px;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
  margin-bottom: 10px;
}

.breadcrumb a {
  color: var(--muted);
}

.breadcrumb a:hover {
  color: var(--green);
}

.breadcrumb span {
  margin: 0 8px;
  color: var(--brown-soft);
}

.breadcrumb .current {
  color: var(--brown-deep);
  font-weight: 600;
}

/* ---------- 页面通用头部（非首页） ---------- */
.page-hero {
  padding: 70px 0 60px;
  background: linear-gradient(135deg, var(--cream-2) 0%, var(--gold-soft) 100%);
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  right: -60px;
  top: -60px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 93, 58, 0.18) 0%, transparent 70%);
}

.page-hero::after {
  content: "";
  position: absolute;
  left: -40px;
  bottom: -80px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(201, 169, 97, 0.25) 0%, transparent 70%);
}

.page-hero .eyebrow {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 4px;
  color: var(--green);
  text-transform: uppercase;
  font-family: var(--font-en);
  margin-bottom: 14px;
  position: relative;
}

.page-hero h1 {
  font-size: 42px;
  color: var(--ink);
  letter-spacing: 1px;
  margin-bottom: 14px;
  position: relative;
}

.page-hero p {
  color: var(--brown);
  font-size: 16px;
  max-width: 640px;
  position: relative;
}

/* ==========================================================================
   滚动渐入动画
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

.reveal.d1 { transition-delay: 0.1s; }
.reveal.d2 { transition-delay: 0.2s; }
.reveal.d3 { transition-delay: 0.3s; }
.reveal.d4 { transition-delay: 0.4s; }

/* ==========================================================================
   页脚
   ========================================================================== */
.site-foot {
  background: linear-gradient(135deg, var(--green-deep) 0%, var(--brown-ink) 100%);
  color: rgba(245, 241, 232, 0.7);
  padding: 64px 0 0;
  position: relative;
}

.foot-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 48px;
}

.foot-col h4 {
  color: #fff;
  font-size: 16px;
  margin-bottom: 22px;
  letter-spacing: 1px;
}

.foot-col p {
  font-size: 13.5px;
  line-height: 1.9;
  color: rgba(245, 241, 232, 0.6);
}

.foot-col ul li {
  margin-bottom: 11px;
}

.foot-col ul li a {
  color: rgba(245, 241, 232, 0.65);
  font-size: 13.5px;
  transition: all 0.25s ease;
  display: inline-block;
}

.foot-col ul li a:hover {
  color: var(--gold);
  transform: translateX(4px);
}

.foot-contact li {
  display: flex;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 13.5px;
  color: rgba(245, 241, 232, 0.65);
}

.foot-contact li svg {
  flex-shrink: 0;
  margin-top: 3px;
}

.foot-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.foot-brand strong {
  color: #fff;
  font-size: 19px;
  letter-spacing: 1px;
}

.foot-bottom {
  border-top: 1px solid rgba(245, 241, 232, 0.12);
  padding: 22px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12.5px;
  color: rgba(245, 241, 232, 0.5);
  flex-wrap: wrap;
  gap: 12px;
}

.foot-bottom a {
  color: rgba(245, 241, 232, 0.5);
}

.foot-bottom a:hover {
  color: var(--gold);
}

.foot-links a {
  margin-left: 18px;
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1100px) {
  :root {
    --side-w: 260px;
  }
  .container {
    padding: 0 30px;
  }
  .sec-head h2 {
    font-size: 30px;
  }
}

@media (max-width: 900px) {
  /* 侧边栏改为抽屉 */
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.35s ease;
    box-shadow: var(--shadow-lg);
  }

  .sidebar.show {
    transform: translateX(0);
  }

  .main {
    margin-left: 0;
  }

  .mobile-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 90;
    padding: 14px 22px;
    background: linear-gradient(135deg, var(--green-deep) 0%, var(--green) 100%);
    border-bottom: 1px solid rgba(201, 169, 97, 0.25);
  }

  .mobile-bar .m-logo {
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .mobile-bar .m-logo strong {
    font-size: 17px;
    color: #F5F1E8;
  }

  .mobile-bar .m-logo img {
    width: 34px;
    height: 34px;
  }

  .hamburger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    width: 42px;
    height: 42px;
    align-items: center;
    justify-content: center;
    border-radius: var(--r-sm);
    background: rgba(201, 169, 97, 0.18);
  }

  .hamburger span {
    width: 20px;
    height: 2px;
    background: var(--gold-soft);
    border-radius: 2px;
    transition: all 0.3s ease;
  }

  .hamburger.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .hamburger.active span:nth-child(2) {
    opacity: 0;
  }
  .hamburger.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(31, 30, 24, 0.55);
    z-index: 95;
  }

  .overlay.show {
    display: block;
  }

  .container {
    padding: 0 22px;
  }

  .section {
    padding: 56px 0;
  }

  .curve-top,
  .curve-both {
    padding-top: 90px;
  }

  .curve-bottom,
  .curve-both {
    padding-bottom: 90px;
  }

  .curve-top::before,
  .curve-bottom::after,
  .curve-both::before,
  .curve-both::after {
    height: 60px;
  }

  .page-hero h1 {
    font-size: 32px;
  }

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

@media (max-width: 560px) {
  .sec-head h2 {
    font-size: 25px;
  }
  .page-hero h1 {
    font-size: 26px;
  }
  .foot-grid {
    grid-template-columns: 1fr;
  }
  .foot-bottom {
    flex-direction: column;
    text-align: center;
  }
  .foot-links a {
    margin: 0 9px;
  }
}