/* ===================================================================
   如意院 · 道家修身  —  视觉系统
   取意:宣纸、松烟墨、朱砂印、青绿远山。以留白为体,以线条为用。
   =================================================================== */

:root {
  /* 纸与墨 */
  --paper:      #F4EFE4;
  --paper-2:    #EDE6D8;
  --paper-3:    #E3DACA;
  --paper-card: #FBF8F1;
  --ink:        #1C1A17;
  --ink-2:      #46413A;
  --ink-3:      #7B7466;
  --ink-4:      #A79E8C;

  /* 五色 */
  --cinnabar:   #A8382C;   /* 朱砂:印章、价格、要紧处 */
  --cinnabar-d: #8A2C22;
  --azurite:    #3E6068;   /* 石青:链接、次要动作 */
  --pine:       #5C6B4C;   /* 松绿 */
  --gold:       #B08D57;   /* 藤黄:点缀 */

  --line:       rgba(28,26,23,.13);
  --line-2:     rgba(28,26,23,.07);
  --shadow:     0 1px 2px rgba(28,26,23,.05), 0 8px 28px -12px rgba(28,26,23,.18);
  --shadow-lg:  0 2px 6px rgba(28,26,23,.06), 0 24px 60px -24px rgba(28,26,23,.28);

  --serif: "Songti SC", "STSong", "Source Han Serif SC", "Noto Serif CJK SC",
           "SimSun", Georgia, serif;
  --sans:  "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC",
           "Noto Sans CJK SC", system-ui, -apple-system, sans-serif;
  --mono:  "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  --wrap: 1180px;
  --radius: 3px;               /* 道家取方正,圆角极克制 */
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-2);
  background-color: var(--paper);
  /* 宣纸纤维:极淡的噪点 */
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='.035'/%3E%3C/svg%3E");
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  color: var(--ink);
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: .02em;
  margin: 0 0 .6em;
}
h1 { font-size: clamp(28px, 4vw, 42px); }
h2 { font-size: clamp(22px, 2.6vw, 30px); }
h3 { font-size: 19px; }
p  { margin: 0 0 1em; }

a { color: var(--azurite); text-decoration: none; transition: color .2s; }
a:hover { color: var(--cinnabar); }

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

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 780px; }

/* ---------- 通用装饰 ---------- */

/* 竖排小字(书法感标注) */
.vertical {
  writing-mode: vertical-rl;
  font-family: var(--serif);
  letter-spacing: .3em;
}

/* 章节题首:朱砂小印 + 标题 */
.sec-head { text-align: center; margin-bottom: 44px; }
.sec-head .eyebrow {
  display: inline-block;
  font-family: var(--serif);
  font-size: 13px;
  letter-spacing: .5em;
  text-indent: .5em;
  color: var(--cinnabar);
  margin-bottom: 10px;
}
.sec-head h2 { margin-bottom: 12px; }
.sec-head p { color: var(--ink-3); max-width: 620px; margin: 0 auto; }

/* 云纹分隔 */
.rule {
  height: 18px;
  margin: 0 auto 26px;
  width: 120px;
  background: no-repeat center/contain
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 120 18'%3E%3Cg fill='none' stroke='%23A8382C' stroke-width='1.1' opacity='.55'%3E%3Cpath d='M2 9h34'/%3E%3Cpath d='M84 9h34'/%3E%3Cpath d='M52 9a8 8 0 1 1 16 0a8 8 0 1 1-16 0'/%3E%3Cpath d='M60 1v16'/%3E%3C/g%3E%3Ccircle cx='56' cy='5.4' r='1.7' fill='%23A8382C' opacity='.55'/%3E%3Ccircle cx='64' cy='12.6' r='1.7' fill='%23A8382C' opacity='.55'/%3E%3C/svg%3E");
}

/* 印章 */
.seal {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px;
  background: var(--cinnabar);
  color: #FBF6EC;
  font-family: var(--serif);
  font-size: 15px; font-weight: 600;
  line-height: 1.15; text-align: center;
  letter-spacing: 0;
  border-radius: 2px;
  box-shadow: inset 0 0 0 1.5px rgba(251,246,236,.35);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 30px;
  font-family: var(--serif);
  font-size: 16px; letter-spacing: .12em; text-indent: .12em;
  border: 1px solid var(--ink); border-radius: var(--radius);
  background: var(--ink); color: var(--paper);
  cursor: pointer; transition: all .22s ease;
  white-space: nowrap;
}
.btn:hover { background: var(--cinnabar); border-color: var(--cinnabar); color: #FBF6EC; }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn-cinnabar { background: var(--cinnabar); border-color: var(--cinnabar); color: #FBF6EC; }
.btn-cinnabar:hover { background: var(--cinnabar-d); border-color: var(--cinnabar-d); }
.btn-sm { padding: 7px 18px; font-size: 14px; }
.btn-lg { padding: 15px 44px; font-size: 17px; }
.btn:disabled, .btn.is-disabled { opacity: .45; cursor: not-allowed; pointer-events: none; }

/* ---------- 页头 ---------- */
.site-head {
  position: sticky; top: 0; z-index: 50;
  background: rgba(244,239,228,.92);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-head .inner {
  max-width: var(--wrap); margin: 0 auto; padding: 0 24px;
  height: 70px; display: flex; align-items: center; gap: 30px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand .name {
  font-family: var(--serif); font-size: 21px; font-weight: 600;
  color: var(--ink); letter-spacing: .18em; text-indent: .18em;
}
.brand .name small {
  display: block; font-size: 10px; letter-spacing: .28em;
  color: var(--ink-4); font-family: var(--sans); text-indent: .28em;
}
.nav { display: flex; gap: 30px; margin-left: auto; align-items: center; }
.nav a {
  font-family: var(--serif); font-size: 16px; color: var(--ink-2);
  letter-spacing: .1em; position: relative; padding: 4px 0;
}
.nav a::after {
  content: ''; position: absolute; left: 0; right: 100%; bottom: 0;
  height: 1px; background: var(--cinnabar); transition: right .28s ease;
}
.nav a:hover, .nav a.on { color: var(--ink); }
.nav a:hover::after, .nav a.on::after { right: 0; }
.head-actions { display: flex; align-items: center; gap: 14px; margin-left: 8px; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; margin-left: auto; }
.nav-toggle span { display: block; width: 22px; height: 1.5px; background: var(--ink); margin: 5px 0; transition: .25s; }

/* ---------- 首页 Hero:水墨远山 ---------- */
.hero {
  position: relative; overflow: hidden;
  padding: 108px 0 128px;
  background:
    radial-gradient(120% 90% at 50% 0%, #FBF8F1 0%, var(--paper) 46%, var(--paper-2) 100%);
}
.hero-mountains {
  position: absolute; left: 0; right: 0; bottom: 0; height: 340px;
  pointer-events: none; opacity: .9;
}
.hero-mist {
  position: absolute; left: 0; right: 0; bottom: 0; height: 200px;
  background: linear-gradient(to top, var(--paper) 12%, rgba(244,239,228,0) 100%);
  pointer-events: none;
}
.hero .inner { position: relative; z-index: 2; text-align: center; }
.hero .eyebrow {
  font-family: var(--serif); font-size: 13px; letter-spacing: .62em;
  text-indent: .62em; color: var(--cinnabar); margin-bottom: 22px;
}
.hero h1 {
  font-size: clamp(34px, 5.6vw, 60px);
  letter-spacing: .1em; text-indent: .1em; margin-bottom: 22px; line-height: 1.32;
}
.hero .lead {
  font-family: var(--serif); font-size: clamp(16px, 1.6vw, 19px);
  color: var(--ink-2); max-width: 640px; margin: 0 auto 38px; line-height: 2;
}
.hero-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-meta {
  margin-top: 56px; display: flex; justify-content: center; gap: 56px; flex-wrap: wrap;
}
.hero-meta div { text-align: center; }
.hero-meta b {
  display: block; font-family: var(--serif); font-size: 30px; color: var(--ink); font-weight: 600;
}
.hero-meta span { font-size: 13px; color: var(--ink-3); letter-spacing: .16em; }

/* 竖排引言(挂在 hero 右侧) */
.hero-vert {
  position: absolute; right: max(28px, calc(50vw - var(--wrap)/2 - 10px)); top: 96px;
  font-size: 15px; color: var(--ink-4); opacity: .8; z-index: 2;
}

/* ---------- 区块 ---------- */
.section { padding: 92px 0; }
.section-alt { background: var(--paper-2); border-block: 1px solid var(--line-2); }

/* ---------- 三才/四象 图标格 ---------- */
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }

.pillar { text-align: center; padding: 8px 12px; }
.pillar .ico {
  width: 62px; height: 62px; margin: 0 auto 18px;
  display: grid; place-items: center;
  border: 1px solid var(--line); border-radius: 50%;
  background: var(--paper-card);
}
.pillar h3 { font-size: 18px; letter-spacing: .12em; margin-bottom: 8px; }
.pillar p { font-size: 14.5px; color: var(--ink-3); line-height: 1.9; margin: 0; }

/* ---------- 课程卡 ---------- */
.course-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.course-card {
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex; flex-direction: column;
  transition: transform .3s cubic-bezier(.2,.7,.3,1), box-shadow .3s, border-color .3s;
}
.course-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(168,56,44,.3);
}
.course-cover {
  position: relative; aspect-ratio: 16/10; overflow: hidden;
  background: linear-gradient(150deg, #DED5C2 0%, #C9BEA6 55%, #B9AC91 100%);
}
.course-cover img { width: 100%; height: 100%; object-fit: cover; }
.course-cover .ph {
  position: absolute; inset: 0; display: grid; place-items: center;
}
.course-cover .badge {
  position: absolute; left: 0; top: 14px;
  background: var(--cinnabar); color: #FBF6EC;
  font-family: var(--serif); font-size: 12px;
  letter-spacing: .16em; padding: 4px 12px 4px 10px;
}
.course-body { padding: 20px 22px 22px; display: flex; flex-direction: column; flex: 1; }
.course-body h3 {
  font-size: 19px; margin-bottom: 8px; letter-spacing: .04em;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.course-body .sub {
  font-size: 14px; color: var(--ink-3); margin-bottom: 14px; line-height: 1.8;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.course-meta {
  display: flex; gap: 14px; font-size: 12.5px; color: var(--ink-4);
  padding-top: 14px; margin-top: auto; border-top: 1px solid var(--line-2);
  align-items: center;
}
.course-meta .price {
  margin-left: auto; font-family: var(--serif); font-size: 22px;
  color: var(--cinnabar); font-weight: 600;
}
.course-meta .price small { font-size: 13px; }
.course-meta .origin { text-decoration: line-through; color: var(--ink-4); font-size: 13px; }
.tag {
  display: inline-block; font-size: 12px; padding: 2px 9px;
  border: 1px solid var(--line); border-radius: 2px; color: var(--ink-3);
  background: rgba(255,255,255,.4);
}
.tag-free { color: var(--pine); border-color: rgba(92,107,76,.4); }
.tag-owned { color: var(--cinnabar); border-color: rgba(168,56,44,.4); }

/* ---------- 表单 ---------- */
.form-card {
  background: var(--paper-card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 40px; box-shadow: var(--shadow);
}
.field { margin-bottom: 20px; }
.field label {
  display: block; font-size: 13.5px; color: var(--ink-2);
  margin-bottom: 7px; letter-spacing: .08em;
}
.field .hint { font-size: 12.5px; color: var(--ink-4); margin-top: 6px; }
input[type=text], input[type=email], input[type=password], input[type=number],
input[type=tel], input[type=url], input[type=date], select, textarea {
  width: 100%; padding: 11px 14px;
  font-family: var(--sans); font-size: 15px; color: var(--ink);
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  transition: border-color .2s, box-shadow .2s;
}
input:focus, select:focus, textarea:focus {
  outline: 0; border-color: var(--azurite);
  box-shadow: 0 0 0 3px rgba(62,96,104,.12);
}
textarea { resize: vertical; min-height: 110px; line-height: 1.8; }
select { appearance: none; background-image:
  url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%237B7466' fill='none' stroke-width='1.4'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 14px center; padding-right: 34px; }

.alert {
  padding: 12px 16px; border-radius: var(--radius); font-size: 14.5px;
  margin-bottom: 20px; border: 1px solid;
}
.alert-err { background: rgba(168,56,44,.07); border-color: rgba(168,56,44,.28); color: var(--cinnabar-d); }
.alert-ok  { background: rgba(92,107,76,.08); border-color: rgba(92,107,76,.3); color: var(--pine); }
.alert-info{ background: rgba(62,96,104,.07); border-color: rgba(62,96,104,.25); color: var(--azurite); }

/* ---------- 页脚 ---------- */
.site-foot {
  background: var(--ink); color: rgba(244,239,228,.62);
  padding: 60px 0 34px; font-size: 14px; margin-top: 0;
}
.site-foot h4 {
  color: var(--paper); font-family: var(--serif); font-size: 15px;
  letter-spacing: .18em; margin-bottom: 16px;
}
.site-foot a { color: rgba(244,239,228,.62); }
.site-foot a:hover { color: var(--gold); }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: 40px; }
.foot-bottom {
  margin-top: 44px; padding-top: 22px; border-top: 1px solid rgba(244,239,228,.12);
  display: flex; justify-content: space-between; gap: 18px; flex-wrap: wrap;
  font-size: 13px; color: rgba(244,239,228,.42);
}

/* ---------- 页面通用 ---------- */
.page-head {
  padding: 62px 0 40px; text-align: center;
  border-bottom: 1px solid var(--line-2); background: var(--paper-2);
}
.page-head .eyebrow {
  font-family: var(--serif); font-size: 12.5px; letter-spacing: .5em;
  text-indent: .5em; color: var(--cinnabar); margin-bottom: 12px;
}
.page-head h1 { margin-bottom: 10px; }
.page-head p { color: var(--ink-3); max-width: 600px; margin: 0 auto; }

.crumb { font-size: 13px; color: var(--ink-4); padding: 20px 0; }
.crumb a { color: var(--ink-3); }

.empty {
  text-align: center; padding: 80px 20px; color: var(--ink-4);
  font-family: var(--serif); font-size: 16px; letter-spacing: .1em;
}

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .course-grid { grid-template-columns: repeat(2, 1fr); }
  .foot-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .hero-vert { display: none; }
}
@media (max-width: 720px) {
  body { font-size: 15.5px; }
  .section { padding: 62px 0; }
  .hero { padding: 72px 0 88px; }
  .nav {
    position: fixed; inset: 70px 0 auto; flex-direction: column; gap: 0;
    background: var(--paper); border-bottom: 1px solid var(--line);
    padding: 8px 24px 20px; margin: 0; display: none;
  }
  .nav.open { display: flex; }
  .nav a { padding: 13px 0; border-bottom: 1px solid var(--line-2); width: 100%; }
  .nav-toggle { display: block; }
  .head-actions { margin-left: 0; }
  .grid-3, .grid-2, .course-grid { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .foot-grid { grid-template-columns: 1fr; }
  .hero-meta { gap: 32px; }
  .form-card { padding: 26px 20px; }
  .wrap { padding: 0 18px; }
}

/* ===================================================================
   入场:滚动驱动的淡入。
   刻意用纯 CSS + @supports —— 不支持 animation-timeline 的浏览器
   直接看到完整内容(元素默认就是可见的),不存在"动画没触发导致白屏"。
   =================================================================== */
@keyframes rxy-enter {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: none; }
}
@supports (animation-timeline: view()) {
  @media (prefers-reduced-motion: no-preference) {
    .pillar, .course-card, .detail-block, .stat, .my-course, .sec-head {
      animation: rxy-enter linear both;
      animation-timeline: view();
      animation-range: entry 0% entry 42%;
    }
  }
}