/* ==========================================================
   妙观空间 · 视觉系统 v3（新中式 × 科技感 Neo-Chinese Tech）
   ------------------------------------------------------------
   东方禅意骨架 + 克制的数字精致感：
     · 宣纸米底 / 松墨绿主色 / 淡金细线 / 朱砂点缀
     · 宋体大标题 + 等宽小标签（编号、数据）
     · 发丝金线、角标十字、极淡网格、柔光晕 —— 只做"呼吸感"，不做霓虹
   ========================================================== */

:root {
  --ink: #141815;
  --ink-2: #3b4640;
  --muted: #6e7a72;
  --brand: #1e4a3e;
  --brand-600: #2a6353;
  --brand-100: #e3ebe5;
  --gold: #c2a062;
  --gold-soft: #d8c49a;
  --cinnabar: #a8443a;
  --paper: #f6f4ef;
  --paper-2: #efece4;
  --bg: #fbfaf7;
  --deep: #0e1512;
  --deep-2: #16201c;
  --line: #dcd7cd;
  --line-2: #e9e5dc;

  --serif: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", "SimSun", Georgia, serif;
  --sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, "Courier New", monospace;

  --max: 1240px;
  --header-h: 74px;
  --pad: clamp(20px, 4vw, 48px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { font-family: var(--serif); font-weight: 600; line-height: 1.35; margin: 0; letter-spacing: .01em; }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }
button { font-family: inherit; }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 var(--pad); }
.measure { max-width: 52ch; }
.note { font-size: 13.5px; color: var(--muted); line-height: 1.8; }
.mt { margin-top: 26px; }

/* ============ 通用装饰：金色发丝线 / 角标 ============ */
.gline { height: 1px; background: linear-gradient(90deg, var(--gold), rgba(194, 160, 98, 0)); border: 0; margin: 0; }

/* ============ 头部 ============ */
.header {
  position: sticky; top: 0; z-index: 60;
  background: rgba(251, 250, 247, .92);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line-2);
}
.header::after {
  content: ""; display: block; height: 1px;
  background: linear-gradient(90deg, rgba(194, 160, 98, .7), rgba(194, 160, 98, .1) 40%, transparent);
}
.header__inner { display: flex; align-items: center; gap: clamp(16px, 3vw, 40px); height: var(--header-h); }

.brandmark { display: flex; align-items: center; gap: 11px; flex: none; }
.brandmark__seal {
  width: 34px; height: 34px; display: grid; place-items: center;
  font-family: var(--serif); font-size: 17px; color: var(--gold);
  border: 1px solid var(--gold); border-radius: 1px;
  background: linear-gradient(180deg, #fff, var(--paper));
}
.brandmark b { display: block; font-family: var(--serif); font-size: 16.5px; letter-spacing: .06em; }
.brandmark span span { display: block; font-family: var(--mono); font-size: 9.5px; letter-spacing: .22em; color: var(--muted); text-transform: uppercase; }

.nav { margin-left: auto; display: flex; gap: clamp(14px, 2vw, 30px); }
.nav a {
  font-size: 14.5px; color: var(--ink-2); padding: 6px 0; position: relative; letter-spacing: .04em;
}
.nav a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: 0; height: 1px;
  background: var(--gold); transition: right .28s ease;
}
.nav a:hover::after, .nav a.is-active::after { right: 0; }
.nav a.is-active { color: var(--brand); font-weight: 600; }

.nav-toggle { display: none; margin-left: auto; width: 40px; height: 40px; border: 1px solid var(--line); background: none; padding: 0; }
.nav-toggle span { display: block; width: 18px; height: 1px; background: var(--ink); margin: 4px auto; }

.header__actions { display: flex; align-items: center; gap: 10px; margin-left: clamp(8px, 2vw, 20px); }

/* ============ 按钮 ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; font-size: 14.5px; letter-spacing: .06em; border-radius: 1px;
  border: 1px solid transparent; cursor: pointer; transition: .22s ease; white-space: nowrap;
}
/* CTA 层级：主行动 = 品牌绿实心；转化核心 = 朱砂；次要 = 描边；弱 = 文字链 */
.btn--solid { background: var(--brand); color: #fff; border-color: var(--brand); }
.btn--solid:hover { background: var(--brand-600); border-color: var(--brand-600); box-shadow: 0 6px 22px rgba(30, 74, 62, .22); }
/* 转化核心（下单 / 报名 / 付费）——一眼看到"钱"和"行动"在哪 */
.btn--accent { background: var(--cinnabar); color: #fff; border-color: var(--cinnabar); }
.btn--accent:hover { background: #96382f; border-color: #96382f; box-shadow: 0 6px 22px rgba(168, 68, 58, .26); }
.btn--outline { border-color: var(--line); color: var(--ink-2); background: transparent; }
.btn--outline:hover { border-color: var(--brand); color: var(--brand); background: rgba(30, 74, 62, .04); }
/* 卡片内的可点按钮：品牌描边，明确"这里能点" */
.btn--line { border-color: var(--brand); color: var(--brand); background: transparent; }
.btn--line:hover { background: var(--brand); color: #fff; }
.btn--gold { border-color: var(--gold); color: var(--gold); }
.btn--gold:hover { background: rgba(194, 160, 98, .12); }
.btn--light { border-color: rgba(255, 255, 255, .5); color: #fff; }
.btn--light:hover { background: rgba(255, 255, 255, .1); border-color: #fff; }
.btn--block { display: flex; width: 100%; }
.btn--sm { padding: 8px 16px; font-size: 13.5px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn:active { transform: translateY(1px); }
.btn:focus-visible, a:focus-visible, button:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; }
/* 提交中状态 */
/* 需要被看见的主按钮，轻轻呼吸一下 */
.btn--accent.is-pulse { animation: pulse 1.1s ease 2; }
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(168, 68, 58, .45); }
  50% { box-shadow: 0 0 0 10px rgba(168, 68, 58, 0); }
}
.btn.is-loading { pointer-events: none; opacity: .8; }
.btn.is-loading::after {
  content: ''; width: 13px; height: 13px; border: 2px solid currentColor;
  border-top-color: transparent; border-radius: 50%; animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.tlink {
  display: inline-flex; align-items: center; gap: 6px; font-size: 14px; color: var(--brand);
  border-bottom: 1px solid var(--gold); padding-bottom: 2px; transition: .2s;
}
.tlink:hover { gap: 10px; color: var(--gold); border-bottom-color: var(--gold); }
.tlink::after { content: '→'; font-size: 13px; }

/* ============ 主视觉 ============ */
.hero { position: relative; padding: clamp(56px, 8vw, 104px) 0 clamp(40px, 5vw, 64px); overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(60% 50% at 82% 8%, rgba(194, 160, 98, .13), transparent 70%),
    radial-gradient(40% 40% at 4% 90%, rgba(30, 74, 62, .07), transparent 70%);
}
.hero__grid {
  position: relative; display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  gap: clamp(28px, 5vw, 72px); align-items: center;
}
.hero__label {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .3em; color: var(--gold);
  display: inline-flex; align-items: center; gap: 10px; margin-bottom: 22px;
}
.hero__label::before { content: ""; width: 26px; height: 1px; background: var(--gold); }
.hero h1 { font-size: clamp(38px, 6.4vw, 74px); letter-spacing: .02em; }
.hero h1 em { font-style: normal; color: var(--brand); position: relative; }
.hero__slogan {
  font-family: var(--serif); font-size: clamp(17px, 2vw, 22px); color: var(--ink-2);
  margin-top: 22px; letter-spacing: .18em;
}
.hero__lead { margin-top: 18px; font-size: 15.5px; color: var(--muted); line-height: 2; }
.hero__cta { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 34px; }

.hero__figure { position: relative; }
.hero__figure img { width: 100%; height: clamp(280px, 42vw, 460px); object-fit: cover; border-radius: 1px; }
.hero__figure::before {
  content: ""; position: absolute; inset: 14px -14px -14px 14px; border: 1px solid var(--gold); opacity: .35; z-index: -1;
}
.hero__cap {
  position: absolute; left: 0; bottom: 0; background: rgba(14, 21, 18, .82); color: #fff;
  font-size: 12px; letter-spacing: .3em; padding: 9px 16px; font-family: var(--mono);
}

.hero__strip {
  position: relative; margin-top: clamp(40px, 5vw, 64px); display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); border-top: 1px solid var(--line);
}
.hero__strip > div { padding: 22px 20px 8px; border-right: 1px solid var(--line-2); }
.hero__strip > div:last-child { border-right: 0; }
.hero__strip b {
  display: block; font-family: var(--serif); font-size: clamp(26px, 3vw, 38px); color: var(--brand); line-height: 1.2;
}
.hero__strip span { font-size: 13px; color: var(--muted); letter-spacing: .08em; }

/* ============ 章节 ============ */
.sec { padding: clamp(56px, 7vw, 104px) 0; }
.sec--paper { background: var(--paper); border-top: 1px solid var(--line-2); border-bottom: 1px solid var(--line-2); }
.sec--ink {
  background: var(--deep); color: #fff; position: relative; overflow: hidden;
}
.sec--ink::before {
  content: ""; position: absolute; inset: 0; opacity: .5; pointer-events: none;
  background-image: linear-gradient(rgba(255, 255, 255, .045) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255, 255, 255, .045) 1px, transparent 1px);
  background-size: 64px 64px;
}
.sec--ink::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(50% 60% at 20% 0%, rgba(194, 160, 98, .18), transparent 70%);
}
.sec--ink .wrap { position: relative; z-index: 1; }
.sec--ink h2 { color: #fff; }

.sec__head {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, .8fr);
  gap: clamp(24px, 4vw, 64px); align-items: end;
  padding-bottom: 30px; margin-bottom: clamp(32px, 4vw, 56px);
  border-bottom: 1px solid var(--line);
  position: relative;
}
.sec__head::after {
  content: ""; position: absolute; left: 0; bottom: -1px; width: 88px; height: 1px; background: var(--gold);
}
.sec__head--stack { grid-template-columns: 1fr; }
.sec__idx {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .26em; color: var(--gold); margin-bottom: 16px;
}
.sec__idx::before { content: ""; width: 5px; height: 5px; background: var(--gold); }
.sec__side p { font-size: 14.5px; color: var(--muted); line-height: 1.95; }
.sec__side .tlink { margin-top: 14px; }
.sec h2 { font-size: clamp(26px, 3.4vw, 40px); }

/* ============ 编号条目 ============ */
.entries { display: grid; }
.entry {
  display: grid; grid-template-columns: 88px minmax(0, .9fr) minmax(0, 1.3fr);
  gap: clamp(16px, 3vw, 40px); padding: 30px 0; border-bottom: 1px solid var(--line-2);
  position: relative; transition: background .25s;
}
.entry:hover { background: rgba(194, 160, 98, .05); }
.entry__no {
  font-family: var(--mono); font-size: 13px; letter-spacing: .12em; color: var(--gold);
  padding-top: 4px;
}
.entry__t h3 { font-size: clamp(19px, 2.2vw, 25px); }
.kw { font-size: 13px; color: var(--muted); letter-spacing: .14em; margin-top: 8px; font-family: var(--mono); }
.entry__d p { font-size: 15px; color: var(--ink-2); line-height: 1.95; }
.entry__d ul { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 8px; }
.entry__d li { font-size: 13px; padding: 4px 12px; border: 1px solid var(--line); color: var(--muted); }

/* ============ 三栏 / 双栏 ============ */
.cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: clamp(24px, 3vw, 48px); }
.col { position: relative; padding-top: 26px; border-top: 1px solid var(--line); }
.col::before {
  content: "+"; position: absolute; right: 0; top: 22px; font-family: var(--mono); color: var(--gold); font-size: 14px;
}
.col h3 { font-size: 21px; color: var(--brand); }
.col p { margin-top: 12px; font-size: 14.5px; color: var(--muted); line-height: 1.95; }

.g2 { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(24px, 3vw, 48px); }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

/* ============ 图文错位 ============ */
.feature {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(28px, 4vw, 64px); align-items: center;
}
.feature--flip .feature__img { order: 2; }
.feature__img { position: relative; }
.feature__img img { width: 100%; height: clamp(260px, 34vw, 420px); object-fit: cover; }
.feature__img::after {
  content: ""; position: absolute; inset: 0; border: 1px solid rgba(255, 255, 255, .5);
  pointer-events: none; mix-blend-mode: overlay;
}
.feature__cap {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .28em; color: var(--gold); margin-bottom: 16px;
}
.feature__txt h3 { font-size: clamp(22px, 2.6vw, 30px); }
.feature__txt > p { margin-top: 14px; font-size: 15px; color: var(--muted); }
.pull { font-family: var(--serif); font-size: clamp(20px, 2.4vw, 28px); line-height: 1.7; color: var(--ink); }
.pull small { display: block; font-size: 14px; color: var(--muted); margin-top: 10px; letter-spacing: .1em; }

/* ============ 商品卡 ============ */
.pgrid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: clamp(20px, 2.5vw, 34px); }
.pcard {
  position: relative; display: flex; flex-direction: column; background: #fff;
  border: 1px solid var(--line-2); padding: 14px 14px 20px; transition: .25s ease;
}
.pcard:hover { transform: translateY(-3px); border-color: var(--gold); box-shadow: 0 12px 34px rgba(20, 24, 22, .08); }
.pcard[data-open] { cursor: pointer; }
.pcard__img { position: relative; background: var(--paper); aspect-ratio: 1/1; overflow: hidden; }
.pcard__img img { width: 100%; height: 100%; object-fit: cover; }
.pcard__badge {
  position: absolute; top: 10px; left: 10px; background: var(--cinnabar); color: #fff;
  font-size: 11.5px; letter-spacing: .1em; padding: 4px 10px;
}
.pcard__cat { font-family: var(--mono); font-size: 11px; letter-spacing: .2em; color: var(--gold); margin: 16px 0 8px; }
.pcard h4 { font-size: 18px; }
.pcard__desc { margin-top: 8px; font-size: 13.5px; color: var(--muted); line-height: 1.8; }
.pcard__foot { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-top: auto; padding-top: 16px; }
.pcard__btn { margin-top: 12px; }
.price { font-family: var(--serif); font-size: 19px; color: var(--cinnabar); }
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 32px; }
.filters button {
  padding: 8px 18px; font-size: 14px; border: 1px solid var(--line); background: none; cursor: pointer; transition: .2s;
}
.filters button.is-active { background: var(--brand); color: #fff; border-color: var(--brand); }

/* ============ 数据条 ============ */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 1px; background: var(--line-2); }
.stat { background: #fff; padding: 22px 18px; }
.stat b { display: block; font-family: var(--serif); font-size: 28px; color: var(--brand); }
.stat span { font-size: 12.5px; color: var(--muted); letter-spacing: .08em; }

/* ============ 表单 ============ */
.form { display: grid; gap: 20px; }
.field { display: grid; gap: 8px; }
.field label { font-size: 13px; letter-spacing: .12em; color: var(--ink-2); }
.field label i { color: var(--cinnabar); font-style: normal; }
.input, .textarea, .select {
  width: 100%; padding: 13px 15px; border: 1px solid var(--line); background: #fff;
  font: inherit; font-size: 15px; color: var(--ink); border-radius: 1px; transition: .18s;
}
.input:focus, .textarea:focus, .select:focus { outline: none; border-color: var(--gold); box-shadow: 0 0 0 3px rgba(194, 160, 98, .16); }
.textarea { min-height: 130px; resize: vertical; }
.err { font-size: 13px; color: var(--cinnabar); min-height: 18px; }
.ok-tip { font-size: 13px; color: var(--brand); background: var(--brand-100); padding: 10px 12px; }
.ok-tip:empty { display: none; }
.dropzone {
  border: 1px dashed var(--line); padding: 28px; text-align: center; color: var(--muted);
  font-size: 14.5px; background: var(--paper); transition: .2s;
}
.dropzone.is-over { border-color: var(--brand); color: var(--brand); background: #fff; }

/* ============ 面板 / 后台 ============ */
.panel { border: 1px solid var(--line-2); background: #fff; }
.panel__head {
  display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap;
  padding: 18px 24px; border-bottom: 1px solid var(--line-2); background: var(--paper);
}
.panel__head h3 { font-size: 17px; }
.panel__body { padding: 24px; }
.admin-grid { display: grid; grid-template-columns: 360px minmax(0, 1fr); gap: clamp(20px, 3vw, 40px); align-items: start; }
.admin-list { display: grid; }
.admin-row { display: flex; gap: 14px; align-items: center; padding: 14px 0; border-bottom: 1px solid var(--line-2); }
.admin-row img { width: 52px; height: 52px; object-fit: cover; flex: none; background: var(--paper-2); }
.tag { display: inline-block; padding: 3px 12px; font-size: 12px; letter-spacing: .08em; background: var(--brand-100); color: var(--brand); }
.tag--lock { background: var(--paper-2); color: var(--muted); }
.lbtn { border: 0; background: none; color: var(--brand); font-size: 14px; font-weight: 600; padding: 5px 8px; cursor: pointer; }
.lbtn:hover { background: var(--brand-100); }
.lbtn--red { color: var(--cinnabar); }
.lbtn--red:hover { background: #fbeeec; }
.empty { text-align: center; padding: 48px 20px; color: var(--muted); }
.empty b { display: block; font-family: var(--serif); font-size: 17px; color: var(--ink-2); margin-bottom: 8px; }
.thumb { width: 54px; height: 54px; object-fit: cover; flex: none; background: var(--paper-2); }

.tabs { display: flex; flex-wrap: wrap; gap: 2px; border-bottom: 1px solid var(--line); margin-bottom: 28px; }
.tab {
  border: 0; background: none; padding: 12px 16px; font: inherit; font-size: 14.5px; color: var(--muted);
  cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -1px; transition: .18s;
}
.tab:hover { color: var(--ink); }
.tab.is-active { color: var(--brand); border-bottom-color: var(--gold); font-weight: 600; }

.sublist { display: grid; gap: 12px; }
.subitem { border: 1px solid var(--line-2); padding: 16px; background: var(--paper); position: relative; }
.subitem__f { margin-bottom: 12px; }
.subitem__f label { display: block; font-size: 12.5px; letter-spacing: .1em; color: var(--muted); margin-bottom: 6px; }
.imgfield, .mediafield { display: grid; gap: 10px; }
.imgfield__pv { background: var(--paper); border: 1px solid var(--line-2); padding: 10px; min-height: 54px; }
.imgfield__pv img { max-height: 140px; }
.mediafield__pv { background: var(--paper); border: 1px solid var(--line-2); padding: 10px; min-height: 54px; }
.mediafield__pv video, .mediafield__pv audio { display: block; }
.imgwall { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 18px; }
.imgwall img { aspect-ratio: 1/1; object-fit: cover; }
.guide { display: grid; gap: 18px; }
.guide__row { display: grid; grid-template-columns: 34px minmax(0, 1fr); gap: 16px; align-items: start; }
.guide__row > b {
  font-family: var(--mono); font-size: 13px; color: var(--gold); border: 1px solid var(--gold); text-align: center; padding: 4px 0;
}
.guide__row span { display: block; font-size: 14px; color: var(--muted); margin-top: 4px; }
.spec { display: grid; gap: 8px; font-size: 14px; }
.spec div { display: flex; justify-content: space-between; border-bottom: 1px dashed var(--line); padding-bottom: 6px; }

/* ============ 购物车 / 抽屉 ============ */
.cartbtn { position: relative; border: 1px solid var(--line); background: none; padding: 9px 16px; font-size: 14px; cursor: pointer; transition: .2s; }
.cartbtn:hover { border-color: var(--brand); color: var(--brand); }
.cartbtn span { display: inline-block; min-width: 18px; font-family: var(--mono); font-size: 12px; color: var(--cinnabar); }
/* 购物车有货时高亮，明确"这里有东西" */
.cartbtn.is-filled { border-color: var(--brand); color: var(--brand); background: rgba(30, 74, 62, .06); font-weight: 600; }
.cartbtn.is-filled span { color: var(--cinnabar); font-weight: 700; }

/* ============ 返回顶部 ============ */
.totop {
  position: fixed; right: 22px; bottom: 26px; z-index: 190; width: 46px; height: 46px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--line); background: rgba(255, 255, 255, .94); backdrop-filter: blur(6px);
  color: var(--brand); font-size: 18px; cursor: pointer; border-radius: 50%;
  box-shadow: 0 6px 20px rgba(20, 24, 22, .12);
  opacity: 0; visibility: hidden; transform: translateY(8px); transition: .25s ease;
}
.totop.is-show { opacity: 1; visibility: visible; transform: none; }
.totop:hover { background: var(--brand); color: #fff; border-color: var(--brand); }

/* ============ 图片放大查看 ============ */
.lightbox {
  position: fixed; inset: 0; z-index: 300; background: rgba(14, 21, 18, .92);
  display: flex; align-items: center; justify-content: center; padding: 40px; cursor: zoom-out;
}
.lightbox img { max-width: 100%; max-height: 100%; object-fit: contain; box-shadow: 0 20px 60px rgba(0, 0, 0, .5); }
.lightbox__x { position: absolute; top: 18px; right: 22px; background: none; border: 0; color: #fff; font-size: 30px; cursor: pointer; line-height: 1; }
.zoomable { cursor: zoom-in; }

/* 头部滚动后加投影，明确"我往下走了" */
.header.is-scrolled { box-shadow: 0 4px 20px rgba(20, 24, 22, .07); }
.drawer__mask { position: fixed; inset: 0; background: rgba(14, 21, 18, .5); z-index: 90; }
.drawer__box {
  position: fixed; top: 0; right: 0; bottom: 0; width: min(420px, 100%); background: #fff; z-index: 91;
  display: flex; flex-direction: column; box-shadow: -12px 0 40px rgba(0, 0, 0, .12);
}
.drawer__head { display: flex; align-items: center; justify-content: space-between; padding: 20px 24px; border-bottom: 1px solid var(--line-2); }
.drawer__body { flex: 1; overflow: auto; padding: 20px 24px; }
.drawer__foot { padding: 20px 24px; border-top: 1px solid var(--line-2); }
.cart-row { display: flex; gap: 14px; align-items: center; padding: 14px 0; border-bottom: 1px solid var(--line-2); }
.cart-row__m { flex: 1; min-width: 0; }
.cart-sum { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 14px; }
.cart-sum b { font-family: var(--serif); font-size: 22px; color: var(--cinnabar); }
.qty { display: inline-flex; align-items: center; gap: 10px; }
.qty button { width: 26px; height: 26px; border: 1px solid var(--line); background: none; cursor: pointer; }

/* ============ 弹窗 ============ */
.modal { position: fixed; inset: 0; z-index: 100; display: none; }
.modal.is-open { display: block; }
.modal__mask { position: absolute; inset: 0; background: rgba(14, 21, 18, .55); backdrop-filter: blur(2px); }
.modal__box {
  position: relative; width: min(560px, calc(100% - 32px)); margin: 8vh auto 0; background: #fff;
  padding: clamp(24px, 3vw, 38px); max-height: 84vh; overflow: auto;
  box-shadow: 0 24px 60px rgba(0, 0, 0, .2);
}
.modal__box--wide { width: min(900px, calc(100% - 32px)); }
.modal__head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; margin-bottom: 22px; }
.modal__head h3 { font-size: 22px; }
.modal__head p { font-size: 14px; color: var(--muted); margin-top: 6px; }
.x { border: 0; background: none; font-size: 26px; line-height: 1; color: var(--muted); cursor: pointer; }
.sw-line { margin-top: 20px; text-align: center; font-size: 14px; color: var(--muted); }
.sw-line button { border: 0; background: none; color: var(--brand); font-weight: 700; cursor: pointer; }
.codefield { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 10px; }
.codefield .btn { white-space: nowrap; padding: 0 16px; }
.modetab { display: flex; gap: 4px; margin-bottom: 22px; border-bottom: 1px solid var(--line); }
.modetab button {
  border: 0; background: none; padding: 10px 14px; font: inherit; font-size: 14.5px; color: var(--muted);
  cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -1px; transition: .18s;
}
.modetab button:hover { color: var(--ink); }
.modetab button.is-active { color: var(--brand); border-bottom-color: var(--gold); font-weight: 600; }

/* ============ 用户区 ============ */
.user-chip { position: relative; }
.user-chip__btn {
  display: flex; align-items: center; gap: 9px; border: 1px solid var(--line); background: #fff;
  padding: 7px 14px; cursor: pointer; font-size: 14px;
}
.avatar {
  width: 28px; height: 28px; display: grid; place-items: center; border-radius: 50%;
  background: var(--brand); color: #fff; font-size: 13px; flex: none;
}
.user-menu { display: none; position: absolute; right: 0; top: calc(100% + 6px); background: #fff; border: 1px solid var(--line-2); min-width: 180px; z-index: 70; box-shadow: 0 12px 30px rgba(0, 0, 0, .1); }
.user-menu.is-open { display: block; }
.user-menu__mail { padding: 12px 16px; font-size: 12.5px; color: var(--muted); border-bottom: 1px solid var(--line-2); font-family: var(--mono); }
.user-menu button { display: block; width: 100%; text-align: left; border: 0; background: none; padding: 11px 16px; font-size: 14px; cursor: pointer; }
.user-menu button:hover { background: var(--paper); }

/* ============ 课程详情 / 播放器 ============ */
.metaline {
  display: flex; flex-wrap: wrap; gap: 10px 28px; margin-top: 28px; padding-top: 20px;
  border-top: 1px solid var(--line); font-size: 14px; color: var(--muted);
}
.metaline b { color: var(--cinnabar); font-family: var(--serif); }
.course-layout { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: clamp(24px, 3vw, 48px); align-items: start; }
.player {
  position: relative; background: var(--deep); overflow: hidden; min-height: 220px;
  display: flex; align-items: center; justify-content: center;
}
.player::before {
  content: ""; position: absolute; inset: 0; opacity: .35; pointer-events: none;
  background-image: linear-gradient(rgba(255, 255, 255, .04) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255, 255, 255, .04) 1px, transparent 1px);
  background-size: 48px 48px;
}
.player video, .player audio { position: relative; z-index: 1; width: 100%; }
.player__text {
  position: relative; z-index: 1; background: var(--paper); padding: clamp(24px, 3vw, 40px);
  font-size: 16px; line-height: 2; color: var(--ink-2); width: 100%;
}
.player__loading { color: rgba(255, 255, 255, .6); font-size: 14px; padding: 60px 20px; font-family: var(--mono); letter-spacing: .1em; }
.player__lock {
  width: 100%; padding: clamp(40px, 6vw, 72px) 24px; text-align: center; color: #fff; position: relative; z-index: 1;
}
.player__lock h3 { font-size: 22px; margin-bottom: 10px; color: #fff; }
.player__lock .note { color: rgba(255, 255, 255, .66); }
.lesson-meta { margin-top: 20px; }
.lesson-list { display: grid; gap: 2px; }
.lesson {
  display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 14px; align-items: center;
  width: 100%; text-align: left; border: 0; border-bottom: 1px solid var(--line-2);
  background: none; padding: 14px 10px; cursor: pointer; font: inherit; transition: .16s;
}
.lesson:hover { background: var(--paper); }
.lesson.is-active { background: var(--brand-100); }
.lesson__no { font-family: var(--mono); font-size: 13px; color: var(--gold); }
.lesson__t { display: grid; gap: 2px; min-width: 0; }
.lesson__t b { font-size: 15px; font-weight: 600; }
.lesson__t .note { font-size: 12.5px; }

/* ============ 时间线 / 期刊条目（关于我们） ============ */
.journal { display: grid; }
.journal__row {
  display: grid; grid-template-columns: 130px minmax(0, 1fr); gap: clamp(16px, 3vw, 40px);
  padding: 26px 0; border-bottom: 1px solid var(--line-2);
}
.journal__row:hover { background: rgba(194, 160, 98, .05); }
.journal__row h4 { font-size: 18px; }
.journal__row p { margin-top: 8px; font-size: 14.5px; color: var(--muted); }
.kicker { font-family: var(--mono); font-size: 11.5px; letter-spacing: .24em; color: var(--gold); }
.infolist { display: grid; gap: 14px; }
.infolist div { display: grid; grid-template-columns: 90px minmax(0, 1fr); gap: 16px; font-size: 14.5px; padding-bottom: 12px; border-bottom: 1px solid var(--line-2); }
.infolist span { color: var(--muted); font-family: var(--mono); font-size: 12px; letter-spacing: .1em; }

/* ============ 页脚 ============ */
.footer { background: var(--deep); color: rgba(255, 255, 255, .72); padding: clamp(48px, 6vw, 76px) 0 28px; position: relative; overflow: hidden; }
.footer::before {
  content: ""; position: absolute; inset: 0; opacity: .45; pointer-events: none;
  background-image: linear-gradient(rgba(255, 255, 255, .04) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255, 255, 255, .04) 1px, transparent 1px);
  background-size: 64px 64px;
}
.footer .wrap { position: relative; z-index: 1; }
.footer__grid { display: grid; grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, 1fr)); gap: clamp(24px, 4vw, 56px); }
.footer h4 { font-size: 15px; color: #fff; margin-bottom: 16px; letter-spacing: .1em; }
.footer ul { display: grid; gap: 10px; font-size: 14px; }
.footer a:hover { color: var(--gold-soft); }
.footer .brandmark b { color: #fff; }
.footer__bottom {
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  margin-top: clamp(36px, 4vw, 56px); padding-top: 22px; border-top: 1px solid rgba(255, 255, 255, .12);
  font-size: 12.5px; color: rgba(255, 255, 255, .5);
}

/* ============ Toast ============ */
.toast-wrap { position: fixed; right: 20px; bottom: 20px; z-index: 200; display: grid; gap: 10px; }
.toast {
  background: var(--deep); color: #fff; padding: 13px 20px; font-size: 14px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, .18); border-left: 2px solid var(--gold);
}
.toast--ok { border-left-color: var(--brand-600); }
.toast--err { border-left-color: var(--cinnabar); }

/* ============ 响应式 ============ */
@media (max-width: 1080px) {
  .course-layout { grid-template-columns: 1fr; }
  .admin-grid { grid-template-columns: 1fr; }
  .sec__head { grid-template-columns: 1fr; align-items: start; }
}
@media (max-width: 860px) {
  .g2, .row2, .hero__grid, .feature, .feature--flip .feature__img { grid-template-columns: 1fr; }
  .feature--flip .feature__img { order: 0; }
  .entry { grid-template-columns: 1fr; gap: 10px; }
  .entry__no { padding-top: 0; }
  .journal__row { grid-template-columns: 1fr; gap: 8px; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .nav {
    display: none; position: absolute; left: 0; right: 0; top: var(--header-h);
    background: #fff; border-bottom: 1px solid var(--line); flex-direction: column; padding: 14px var(--pad); gap: 4px;
  }
  .nav.is-open { display: flex; }
  .nav-toggle { display: block; }
  .header__actions { margin-left: auto; }
}
@media (max-width: 620px) {
  .footer__grid { grid-template-columns: 1fr; }
  .hero__strip > div { border-right: 0; border-bottom: 1px solid var(--line-2); }
  .infolist div { grid-template-columns: 1fr; gap: 4px; }
  .modal__box { margin-top: 4vh; }
  /* 手机上手指点得准：小按钮与筛选片都保证 44px 触控高度 */
  .btn--sm, .lbtn, .filters button, .cartbtn { min-height: 44px; }
  .filters button { padding: 8px 16px; }
  .totop { right: 14px; bottom: 18px; }
}

/* 尊重"减少动效"偏好 */
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  html { scroll-behavior: auto; }
}