/* ============================================================
   日语 N3 前期入门体系 · 教学站样式
   和纸 / 墨 / 朱印 —— 艺术、简洁、大气
   ============================================================ */

:root {
  --paper: #f7f4ee;
  --paper-2: #fffdf8;
  --paper-3: #efeae0;
  --ink: #1b1a18;
  --ink-2: #4f4c46;
  --ink-3: #8b877f;
  --line: #e3ddd1;
  --line-2: #d2cabb;

  --shu: #b9422f;
  --shu-soft: #f3e2dd;
  --ai: #2f4f6f;
  --ai-soft: #e2eaf1;
  --fuji: #7a6a91;
  --fuji-soft: #eae5f0;
  --matcha: #5f7f58;
  --matcha-soft: #e4ece0;

  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", "Noto Serif JP", "Yu Mincho", serif;
  --jp: "Noto Serif JP", "Yu Mincho", "Hiragino Mincho ProN", "MS Mincho", serif;
  --sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;

  --header-h: 62px;
  --side-w: 234px;
  --r: 3px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 18px); }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  background-image:
    radial-gradient(circle at 12% 8%, rgba(185, 66, 47, .035), transparent 42%),
    radial-gradient(circle at 88% 62%, rgba(47, 79, 111, .035), transparent 46%);
  background-attachment: fixed;
}

/* 和纸纹理 */
body::before {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none; z-index: 0;
  opacity: .5;
  background-image:
    repeating-linear-gradient(90deg, rgba(27,26,24,.018) 0 1px, transparent 1px 4px),
    repeating-linear-gradient(0deg, rgba(27,26,24,.014) 0 1px, transparent 1px 4px);
}

h1, h2, h3, h4 { font-family: var(--serif); font-weight: 600; margin: 0; letter-spacing: .01em; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
::selection { background: var(--shu); color: #fff; }

.jp { font-family: var(--jp); }

/* ---------------- 顶部栏 ---------------- */
.hd {
  position: sticky; top: 0; z-index: 60;
  height: var(--header-h);
  display: flex; align-items: center; gap: 18px;
  padding: 0 26px;
  background: rgba(247, 244, 238, .9);
  backdrop-filter: blur(14px) saturate(1.4);
  border-bottom: 1px solid var(--line);
}
.hd-brand { display: flex; align-items: center; gap: 11px; flex-shrink: 0; }
.hd-seal {
  width: 30px; height: 30px; border-radius: 2px;
  background: var(--shu); color: #fff;
  display: grid; place-items: center;
  font-family: var(--jp); font-size: 15px; line-height: 1;
  letter-spacing: 0; box-shadow: 0 1px 0 rgba(0,0,0,.08);
}
.hd-t { font-family: var(--serif); font-size: 15px; font-weight: 600; letter-spacing: .04em; }
.hd-s { font-size: 10.5px; color: var(--ink-3); letter-spacing: .22em; text-transform: uppercase; }

.hd-nav { display: flex; gap: 2px; margin-left: auto; flex-wrap: wrap; }
.hd-nav a {
  padding: 6px 11px; font-size: 13px; color: var(--ink-2);
  border-radius: var(--r); transition: .22s var(--ease); position: relative;
}
.hd-nav a:hover { color: var(--shu); background: var(--shu-soft); }
.hd-nav a.on { color: var(--shu); }
.hd-nav a.on::after {
  content: ""; position: absolute; left: 11px; right: 11px; bottom: 0;
  height: 1.5px; background: var(--shu);
}

.hd-prog { width: 88px; flex-shrink: 0; }
.hd-prog-l { font-size: 10px; color: var(--ink-3); letter-spacing: .1em; margin-bottom: 4px; }
.hd-prog-b { height: 3px; background: var(--paper-3); border-radius: 2px; overflow: hidden; }
.hd-prog-i { height: 100%; width: 0; background: var(--shu); transition: width .5s var(--ease); }

.burger { display: none; width: 34px; height: 34px; place-items: center; }
.burger span { display: block; width: 16px; height: 1.4px; background: var(--ink); margin: 3.5px 0; transition: .25s var(--ease); }

/* ---------------- 布局 ---------------- */
.wrap { display: flex; position: relative; z-index: 1; max-width: 1420px; margin: 0 auto; }

.side {
  width: var(--side-w); flex-shrink: 0;
  padding: 30px 16px 60px 26px;
  position: sticky; top: var(--header-h);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
}
.side::-webkit-scrollbar { width: 3px; }
.side::-webkit-scrollbar-thumb { background: var(--line-2); border-radius: 2px; }
.side-lbl {
  font-size: 10px; letter-spacing: .24em; color: var(--ink-3);
  text-transform: uppercase; margin: 0 0 10px 10px; font-family: var(--sans);
}
.side-nav { display: flex; flex-direction: column; gap: 1px; margin-bottom: 24px; }
.side-nav a {
  display: flex; align-items: baseline; gap: 9px;
  padding: 7px 10px; font-size: 13.6px; color: var(--ink-2);
  border-left: 2px solid transparent; border-radius: 0 var(--r) var(--r) 0;
  transition: .2s var(--ease);
}
.side-nav a:hover { background: var(--paper-3); color: var(--ink); }
.side-nav a.on { color: var(--shu); border-left-color: var(--shu); background: var(--shu-soft); font-weight: 500; }
.side-nav a i {
  font-style: normal; font-family: var(--serif); font-size: 11px;
  color: var(--ink-3); width: 15px; flex-shrink: 0;
}
.side-nav a.on i { color: var(--shu); }

.side-days { display: flex; flex-wrap: wrap; gap: 3px; padding: 0 6px; }
.side-days b {
  width: 24px; height: 24px; display: grid; place-items: center;
  font-size: 10.5px; font-weight: 500; font-family: var(--sans);
  color: var(--ink-2); background: var(--paper-2);
  border: 1px solid var(--line); border-radius: 2px; cursor: pointer;
  transition: .18s var(--ease);
}
.side-days b:hover { border-color: var(--shu); color: var(--shu); }
.side-days b.done { background: var(--shu); border-color: var(--shu); color: #fff; }

.main { flex: 1; min-width: 0; padding: 0 40px 100px; }

/* ---------------- 通用块 ---------------- */
.sec { padding-top: 64px; }
.sec-head { margin-bottom: 30px; }
.sec-no {
  font-family: var(--serif); font-size: 62px; line-height: .82;
  color: var(--line-2); letter-spacing: .06em; margin-bottom: -6px;
}
.sec-t { font-family: var(--serif); font-size: 29px; letter-spacing: .04em; }
.sec-t small { font-family: var(--jp); font-size: 13px; color: var(--ink-3); letter-spacing: .18em; margin-left: 12px; font-weight: 400; }
.sec-d { color: var(--ink-2); font-size: 13.8px; max-width: 700px; margin-top: 8px; }
.rule { height: 1px; background: var(--line); margin: 14px 0 0; position: relative; }
.rule::before { content: ""; position: absolute; left: 0; top: 0; width: 46px; height: 1px; background: var(--shu); }

/* 滚动显现 */
.rv { opacity: 0; transform: translateY(18px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.rv.in { opacity: 1; transform: none; }

/* ---------------- Hero ---------------- */
.hero { padding: 62px 0 24px; position: relative; }
.hero-vt {
  position: absolute; right: 8px; top: 46px;
  writing-mode: vertical-rl; font-family: var(--jp);
  font-size: 15px; letter-spacing: .52em; color: var(--ink-3); opacity: .72;
}
.hero-kicker {
  font-size: 11px; letter-spacing: .3em; color: var(--shu);
  text-transform: uppercase; margin-bottom: 16px; font-weight: 600;
}
.hero-t {
  font-family: var(--serif); font-size: clamp(38px, 5.4vw, 62px);
  line-height: 1.16; letter-spacing: .02em; max-width: 12em;
}
.hero-t em { font-style: normal; color: var(--shu); position: relative; }
.hero-t em::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: .07em;
  height: .34em; background: var(--shu-soft); z-index: -1;
}
.hero-sub {
  font-family: var(--jp); font-size: 15px; color: var(--ink-3);
  letter-spacing: .3em; margin-top: 14px;
}
.hero-d { margin-top: 20px; max-width: 620px; color: var(--ink-2); font-size: 14.6px; }
.hero-stats { display: flex; gap: 0; margin-top: 40px; flex-wrap: wrap; border-top: 1px solid var(--line); padding-top: 22px; }
.hero-stat { padding-right: 44px; margin-right: 44px; border-right: 1px solid var(--line); }
.hero-stat:last-child { border-right: none; }
.hero-stat b { font-family: var(--serif); font-size: 34px; font-weight: 600; letter-spacing: .02em; }
.hero-stat b i { font-style: normal; font-size: 13px; color: var(--ink-3); margin-left: 4px; font-family: var(--sans); }
.hero-stat span { display: block; font-size: 11.5px; color: var(--ink-3); letter-spacing: .14em; margin-top: 2px; }

/* ---------------- 模块卡 ---------------- */
.mods { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.mod {
  background: var(--paper-2); padding: 26px 26px 24px; position: relative;
  transition: .3s var(--ease); cursor: default;
}
.mod:hover { background: #fff; }
.mod::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 2px;
  transform: scaleY(0); transform-origin: top; transition: transform .4s var(--ease);
}
.mod:hover::before { transform: scaleY(1); }
.mod[data-tone="shu"]::before { background: var(--shu); }
.mod[data-tone="ai"]::before { background: var(--ai); }
.mod[data-tone="fuji"]::before { background: var(--fuji); }
.mod[data-tone="matcha"]::before { background: var(--matcha); }

.mod-top { display: flex; align-items: baseline; gap: 12px; margin-bottom: 6px; }
.mod-no { font-family: var(--serif); font-size: 26px; color: var(--line-2); line-height: 1; }
.mod-n { font-family: var(--serif); font-size: 21px; letter-spacing: .04em; }
.mod-jp { font-family: var(--jp); font-size: 11.5px; color: var(--ink-3); letter-spacing: .16em; }
.mod-en { font-size: 10.5px; color: var(--ink-3); letter-spacing: .14em; text-transform: uppercase; margin-bottom: 12px; }
.mod-span {
  display: inline-block; font-size: 11px; letter-spacing: .1em; padding: 2px 9px;
  border: 1px solid var(--line-2); border-radius: 20px; color: var(--ink-2); margin-bottom: 14px;
}
.mod-goal { font-size: 13.6px; color: var(--ink-2); margin-bottom: 16px; }
.mod-pts { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.mod-pts span {
  font-size: 11.8px; padding: 3px 9px; background: var(--paper-3);
  border-radius: 2px; color: var(--ink-2);
}
.mod-out {
  font-size: 12.6px; color: var(--ink-3); padding-top: 13px;
  border-top: 1px dashed var(--line-2); display: flex; gap: 8px;
}
.mod-out b { color: var(--ink-2); font-weight: 600; flex-shrink: 0; }

/* ---------------- 课程表时间轴 ---------------- */
.tl { position: relative; }
.tl-week { position: relative; padding-left: 52px; margin-bottom: 34px; }
.tl-week::before {
  content: ""; position: absolute; left: 17px; top: 34px; bottom: -34px; width: 1px; background: var(--line);
}
.tl-week:last-child::before { display: none; }
.tl-wm {
  position: absolute; left: 0; top: 0; width: 35px; height: 35px;
  border: 1px solid var(--line-2); background: var(--paper-2);
  display: grid; place-items: center; font-family: var(--serif); font-size: 15px;
  border-radius: 50%; z-index: 1;
}
.tl-week[data-tone="shu"] .tl-wm { color: var(--shu); border-color: var(--shu); }
.tl-week[data-tone="ai"] .tl-wm { color: var(--ai); border-color: var(--ai); }
.tl-week[data-tone="fuji"] .tl-wm { color: var(--fuji); border-color: var(--fuji); }
.tl-week[data-tone="matcha"] .tl-wm { color: var(--matcha); border-color: var(--matcha); }

.tl-wh { display: flex; align-items: baseline; gap: 13px; margin-bottom: 4px; }
.tl-wt { font-family: var(--serif); font-size: 18.5px; letter-spacing: .03em; }
.tl-wth { font-size: 12.6px; color: var(--ink-3); }
.tl-wsub { font-size: 12.6px; color: var(--ink-3); margin-bottom: 14px; }

.les {
  display: grid; grid-template-columns: 46px 1fr; gap: 16px;
  background: var(--paper-2); border: 1px solid var(--line);
  padding: 17px 20px; margin-bottom: 8px; border-radius: var(--r);
  transition: .26s var(--ease);
}
.les:hover { border-color: var(--line-2); box-shadow: 0 6px 22px -14px rgba(27,26,24,.4); transform: translateX(3px); }
.les-id { font-family: var(--serif); font-size: 13px; color: var(--ink-3); letter-spacing: .06em; padding-top: 2px; }
.les-id b { display: block; font-size: 21px; color: var(--ink); font-weight: 600; }
.les-t { font-family: var(--serif); font-size: 16.4px; letter-spacing: .02em; margin-bottom: 3px; }
.les-f { font-size: 12.8px; color: var(--ink-3); margin-bottom: 9px; }
.les-pts { display: flex; flex-wrap: wrap; gap: 5px 14px; margin-bottom: 10px; }
.les-pts li {
  list-style: none; font-size: 12.7px; color: var(--ink-2);
  padding-left: 13px; position: relative;
}
.les-pts li::before {
  content: ""; position: absolute; left: 0; top: .62em;
  width: 4px; height: 4px; border-radius: 50%; background: var(--line-2);
}
.les-meta { display: flex; flex-wrap: wrap; gap: 5px 18px; font-size: 12.2px; color: var(--ink-3); border-top: 1px dashed var(--line); padding-top: 10px; }
.les-meta em { font-style: normal; color: var(--ink-3); }
.les-meta b { font-weight: 500; color: var(--ink-2); }

/* ---------------- 五十音 ---------------- */
.kana-tabs { display: flex; gap: 4px; margin-bottom: 20px; flex-wrap: wrap; }
.kana-tabs button {
  padding: 7px 16px; font-size: 13px; color: var(--ink-2);
  border: 1px solid var(--line); border-radius: 20px; background: var(--paper-2);
  transition: .22s var(--ease);
}
.kana-tabs button:hover { border-color: var(--line-2); }
.kana-tabs button.on { background: var(--ink); border-color: var(--ink); color: var(--paper-2); }

.kana-box { border: 1px solid var(--line); background: var(--paper-2); padding: 22px; }
.kana-hint { font-size: 12.4px; color: var(--ink-3); margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
.kana-hint kbd {
  font-family: var(--sans); font-size: 10.5px; padding: 1px 6px;
  border: 1px solid var(--line-2); border-radius: 3px; background: var(--paper);
  color: var(--ink-2);
}
.kana-grid { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.kana-row { display: contents; }
.kana-lbl {
  background: var(--paper-3); font-family: var(--jp); font-size: 11.5px;
  color: var(--ink-3); display: grid; place-items: center; padding: 8px 2px;
  letter-spacing: .04em;
}
.kana-col {
  background: var(--paper-3); font-family: var(--sans); font-size: 11px;
  color: var(--ink-3); display: grid; place-items: center; padding: 7px 2px;
  letter-spacing: .1em;
}
.kc {
  background: var(--paper-2); display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 1px;
  padding: 11px 4px 9px; cursor: pointer; transition: .2s var(--ease);
  position: relative; min-height: 74px;
}
.kc:hover { background: var(--shu-soft); }
.kc.speaking { background: var(--shu); }
.kc.speaking .kc-h, .kc.speaking .kc-k, .kc.speaking .kc-r { color: #fff; }
.kc-h { font-family: var(--jp); font-size: 25px; line-height: 1.1; color: var(--ink); }
.kc-k { font-family: var(--jp); font-size: 13px; color: var(--ink-3); line-height: 1; }
.kc-r { font-size: 9.5px; letter-spacing: .08em; color: var(--ink-3); text-transform: uppercase; line-height: 1; }
.kc.empty { background: var(--paper-3); cursor: default; }
.kc.empty:hover { background: var(--paper-3); }

.kana-notes { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 22px; }
.knote { border: 1px solid var(--line); background: var(--paper-2); padding: 16px 18px; border-radius: var(--r); }
.knote h4 { font-size: 14.6px; margin-bottom: 6px; }
.knote p { font-size: 12.9px; color: var(--ink-2); }
.knote em { font-family: var(--jp); font-style: normal; display: block; margin-top: 8px; font-size: 13px; color: var(--shu); letter-spacing: .04em; }

/* ---------------- 词汇 ---------------- */
.voc-group { margin-bottom: 26px; }
.voc-h { display: flex; align-items: baseline; gap: 12px; margin-bottom: 12px; }
.voc-h h3 { font-size: 17px; letter-spacing: .03em; }
.voc-h i { font-style: normal; font-size: 11.5px; color: var(--ink-3); letter-spacing: .12em; }
.voc-h::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.voc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 8px; }
.vc {
  border: 1px solid var(--line); background: var(--paper-2);
  padding: 13px 15px; border-radius: var(--r); transition: .24s var(--ease);
}
.vc:hover { border-color: var(--shu); transform: translateY(-2px); box-shadow: 0 8px 22px -16px rgba(185,66,47,.6); }
.vc-top { display: flex; align-items: baseline; gap: 9px; flex-wrap: wrap; }
.vc-jp { font-family: var(--jp); font-size: 18px; letter-spacing: .02em; }
.vc-r { font-size: 10px; color: var(--ink-3); letter-spacing: .08em; }
.vc-cn { font-size: 12.4px; color: var(--shu); margin-left: auto; }
.vc-ex { font-family: var(--jp); font-size: 12.8px; color: var(--ink-2); margin-top: 7px; padding-top: 7px; border-top: 1px dashed var(--line); }
.vc-exc { font-size: 11.6px; color: var(--ink-3); }

/* ---------------- 助词 ---------------- */
.pt-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 12px; }
.pt {
  border: 1px solid var(--line); background: var(--paper-2); border-radius: var(--r);
  overflow: hidden; transition: .26s var(--ease);
}
.pt:hover { border-color: var(--fuji); box-shadow: 0 8px 26px -18px rgba(122,106,145,.8); }
.pt-h { display: flex; align-items: center; gap: 12px; padding: 15px 18px 12px; border-bottom: 1px solid var(--line); }
.pt-k { font-family: var(--jp); font-size: 31px; line-height: 1; color: var(--fuji); }
.pt-r { font-size: 10.5px; letter-spacing: .14em; color: var(--ink-3); text-transform: uppercase; }
.pt-role { margin-left: auto; font-size: 11px; padding: 2px 9px; background: var(--fuji-soft); color: var(--fuji); border-radius: 20px; }
.pt-body { padding: 13px 18px 15px; }
.pt-core { font-size: 13.4px; color: var(--ink-2); margin-bottom: 12px; }
.pt-u { display: flex; flex-direction: column; gap: 9px; }
.pt-u-i { font-size: 12.6px; }
.pt-u-n { color: var(--ink-3); font-size: 11.4px; letter-spacing: .06em; display: block; margin-bottom: 2px; }
.pt-u-e { font-family: var(--jp); font-size: 13.6px; color: var(--ink); }
.pt-u-c { font-size: 12.2px; color: var(--ink-3); }
.pt-tip {
  margin: 13px 18px 16px; padding: 10px 13px; background: var(--paper-3);
  border-left: 2px solid var(--fuji); font-size: 12.3px; color: var(--ink-2); border-radius: 0 var(--r) var(--r) 0;
}
.pt-tip b { color: var(--fuji); }

/* ---------------- 句型 ---------------- */
.pat-cat { margin-bottom: 24px; }
.pat-cat h3 { font-size: 15.5px; letter-spacing: .06em; color: var(--ink-2); margin-bottom: 10px; display: flex; align-items: center; gap: 10px; }
.pat-cat h3::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.pat { border: 1px solid var(--line); background: var(--paper-2); border-radius: var(--r); overflow: hidden; }
.pat-r {
  display: grid; grid-template-columns: minmax(210px, 1.15fr) 1fr 1.5fr;
  gap: 16px; padding: 13px 18px; align-items: center;
  border-bottom: 1px solid var(--line); transition: .22s var(--ease);
}
.pat-r:last-child { border-bottom: none; }
.pat-r:hover { background: var(--matcha-soft); }
.pat-f { font-family: var(--jp); font-size: 14.4px; letter-spacing: .02em; color: var(--matcha); }
.pat-c { font-size: 12.8px; color: var(--ink-2); }
.pat-e { font-family: var(--jp); font-size: 13px; }
.pat-ec { font-size: 11.8px; color: var(--ink-3); }
.pat-hd {
  display: grid; grid-template-columns: minmax(210px, 1.15fr) 1fr 1.5fr;
  gap: 16px; padding: 8px 18px; background: var(--paper-3);
  font-size: 10.5px; letter-spacing: .16em; color: var(--ink-3); text-transform: uppercase;
  border-bottom: 1px solid var(--line);
}

/* ---------------- 打卡 ---------------- */
.ck-bar { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-bottom: 18px; }
.ck-stat { font-size: 13px; color: var(--ink-2); }
.ck-stat b { font-family: var(--serif); font-size: 19px; color: var(--shu); }
.ck-acts { margin-left: auto; display: flex; gap: 8px; }
.btn {
  padding: 7px 15px; font-size: 12.6px; border: 1px solid var(--line-2);
  border-radius: 20px; background: var(--paper-2); color: var(--ink-2);
  transition: .22s var(--ease);
}
.btn:hover { border-color: var(--ink); color: var(--ink); }
.btn.primary { background: var(--ink); border-color: var(--ink); color: var(--paper-2); }
.btn.primary:hover { background: var(--shu); border-color: var(--shu); }

.ck-cal { display: grid; grid-template-columns: repeat(7, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-bottom: 24px; }
.ck-cell {
  background: var(--paper-2); padding: 11px 9px 9px; cursor: pointer;
  transition: .2s var(--ease); position: relative; min-height: 76px; text-align: left;
}
.ck-cell:hover { background: var(--shu-soft); }
.ck-cell.sel { background: var(--ink); }
.ck-cell.sel .ck-d, .ck-cell.sel .ck-th, .ck-cell.sel .ck-m, .ck-cell.sel .ck-chk { color: rgba(255,253,248,.75); }
.ck-cell.sel .ck-d { color: #fff; }
.ck-d { font-family: var(--serif); font-size: 18px; line-height: 1; display: block; }
.ck-th { font-size: 11px; color: var(--ink-3); display: block; margin-top: 4px; line-height: 1.35; }
.ck-m { font-size: 9.5px; letter-spacing: .1em; color: var(--ink-3); text-transform: uppercase; display: block; margin-top: 3px; }
.ck-chk {
  position: absolute; top: 8px; right: 8px; width: 15px; height: 15px;
  border: 1px solid var(--line-2); border-radius: 50%;
  display: grid; place-items: center; font-size: 9px; color: transparent;
  transition: .2s var(--ease);
}
.ck-cell.done .ck-chk { background: var(--shu); border-color: var(--shu); color: #fff; }
.ck-cell.done .ck-d { color: var(--shu); }
.ck-cell.sel.done .ck-d { color: #fff; }
.ck-wmark {
  font-size: 9px; letter-spacing: .18em; color: var(--ink-3);
  grid-column: 1 / -1; background: var(--paper-3); padding: 4px 9px;
  text-transform: uppercase;
}

.ck-panel { border: 1px solid var(--line); background: var(--paper-2); }
.ck-ph { padding: 22px 26px 18px; border-bottom: 1px solid var(--line); display: flex; align-items: flex-start; gap: 20px; flex-wrap: wrap; }
.ck-pd { font-family: var(--serif); font-size: 40px; line-height: 1; }
.ck-pd i { font-style: normal; font-size: 14px; color: var(--ink-3); margin-left: 5px; font-family: var(--sans); }
.ck-pm { padding-top: 3px; }
.ck-pm h3 { font-size: 19px; letter-spacing: .03em; }
.ck-pm p { font-size: 12.6px; color: var(--ink-3); }
.ck-tag { font-size: 11px; padding: 2px 10px; border-radius: 20px; border: 1px solid var(--line-2); color: var(--ink-2); }
.ck-pacts { margin-left: auto; display: flex; gap: 8px; align-items: center; }

.ck-tabs { display: flex; gap: 0; border-bottom: 1px solid var(--line); padding: 0 26px; }
.ck-tabs button {
  padding: 13px 18px; font-size: 13.4px; color: var(--ink-3);
  border-bottom: 2px solid transparent; transition: .22s var(--ease); margin-bottom: -1px;
}
.ck-tabs button:hover { color: var(--ink); }
.ck-tabs button.on { color: var(--shu); border-bottom-color: var(--shu); font-weight: 500; }
.ck-tabs button i { font-style: normal; font-size: 10.5px; color: var(--ink-3); margin-left: 6px; }

.ck-body { padding: 24px 26px 28px; min-height: 240px; }

/* 词汇段 */
.ck-voc { display: grid; grid-template-columns: repeat(auto-fill, minmax(268px, 1fr)); gap: 8px; }
.ckv { border: 1px solid var(--line); border-radius: var(--r); padding: 12px 14px; background: var(--paper); transition: .22s var(--ease); }
.ckv:hover { border-color: var(--shu); background: #fff; }
.ckv-t { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.ckv-jp { font-family: var(--jp); font-size: 17px; }
.ckv-r { font-size: 9.5px; color: var(--ink-3); letter-spacing: .08em; text-transform: uppercase; }
.ckv-cn { font-size: 12.2px; color: var(--ink-2); }
.ckv-n { width: 17px; height: 17px; border-radius: 50%; background: var(--paper-3); color: var(--ink-3); font-size: 9.5px; display: grid; place-items: center; flex-shrink: 0; }
.ckv-ex { font-family: var(--jp); font-size: 12.4px; color: var(--ink-2); margin-top: 6px; }
.ckv-exc { font-size: 11.4px; color: var(--ink-3); }

/* 跟读段 */
.ck-rd { display: flex; flex-direction: column; gap: 10px; }
.rd { border: 1px solid var(--line); border-left: 2px solid var(--ai); border-radius: 0 var(--r) var(--r) 0; padding: 15px 18px; background: var(--paper); }
.rd-top { display: flex; align-items: flex-start; gap: 12px; }
.rd-s { font-family: var(--jp); font-size: 17.5px; line-height: 1.6; flex: 1; letter-spacing: .03em; }
.rd-play {
  width: 30px; height: 30px; border: 1px solid var(--line-2); border-radius: 50%;
  display: grid; place-items: center; flex-shrink: 0; color: var(--ink-2);
  transition: .2s var(--ease); font-size: 11px;
}
.rd-play:hover { background: var(--ai); border-color: var(--ai); color: #fff; }
.rd-play.playing { background: var(--ai); border-color: var(--ai); color: #fff; }
.rd-tip { font-size: 12.3px; color: var(--ink-2); margin-top: 8px; padding-top: 8px; border-top: 1px dashed var(--line); }
.rd-tip b { color: var(--ai); font-weight: 600; }

/* 书面练习段 */
.ck-wr { display: flex; flex-direction: column; gap: 10px; }
.wr { border: 1px solid var(--line); border-radius: var(--r); background: var(--paper); overflow: hidden; }
.wr-q { padding: 15px 18px; display: flex; gap: 12px; align-items: flex-start; }
.wr-n {
  width: 22px; height: 22px; border-radius: 50%; background: var(--matcha-soft);
  color: var(--matcha); font-size: 11px; display: grid; place-items: center; flex-shrink: 0; font-weight: 600;
}
.wr-qt { font-size: 13.8px; line-height: 1.7; }
.wr-ans { border-top: 1px dashed var(--line); padding: 12px 18px 14px 52px; background: var(--paper-3); display: none; }
.wr.open .wr-ans { display: block; }
.wr-ans b { font-size: 11px; letter-spacing: .16em; color: var(--matcha); text-transform: uppercase; display: block; margin-bottom: 4px; }
.wr-ans p { font-size: 13px; color: var(--ink-2); }
.wr-tg {
  font-size: 11.5px; color: var(--matcha); padding: 0 18px 14px 52px;
  display: block; transition: .2s var(--ease);
}
.wr-tg:hover { text-decoration: underline; }

/* ---------------- 页脚 ---------------- */
.foot {
  border-top: 1px solid var(--line); margin-top: 70px; padding: 30px 0 0;
  display: flex; justify-content: space-between; align-items: flex-end; gap: 20px; flex-wrap: wrap;
}
.foot p { font-size: 12px; color: var(--ink-3); }
.foot .jp { font-family: var(--jp); letter-spacing: .3em; color: var(--ink-3); font-size: 12px; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 1120px) {
  .main { padding: 0 26px 80px; }
  .mods { grid-template-columns: 1fr; }
  .kana-notes { grid-template-columns: 1fr; }
  .pat-r, .pat-hd { grid-template-columns: 1fr; gap: 4px; }
  .pat-hd { display: none; }
  .pat-r { padding: 14px 16px; }
  .pat-f { font-size: 13.6px; }
  .pat-r { border-bottom: 1px solid var(--line); }
}
@media (max-width: 900px) {
  .side {
    position: fixed; left: 0; top: var(--header-h); width: 268px;
    background: var(--paper); border-right: 1px solid var(--line);
    transform: translateX(-100%); transition: transform .32s var(--ease); z-index: 55;
  }
  .side.open { transform: none; box-shadow: 22px 0 44px -26px rgba(27,26,24,.45); }
  .burger { display: grid; }
  .hd-nav { display: none; }
  .hd-prog { display: none; }
  .ck-cal { grid-template-columns: repeat(7, 1fr); }
  .ck-cell { min-height: 62px; padding: 9px 6px 7px; }
  .ck-th { font-size: 10px; }
}
@media (max-width: 620px) {
  .main { padding: 0 16px 60px; }
  .hero-vt { display: none; }
  .hero-stat { padding-right: 22px; margin-right: 22px; }
  .hero-stat b { font-size: 27px; }
  .sec-no { font-size: 46px; }
  .sec-t { font-size: 23px; }
  .les { grid-template-columns: 1fr; gap: 6px; }
  .les-id { display: flex; align-items: baseline; gap: 8px; }
  .ck-body, .ck-ph { padding-left: 16px; padding-right: 16px; }
  .ck-tabs { padding: 0 10px; }
  .kana-box { padding: 12px; }
  .kc-h { font-size: 20px; }
  .kc { min-height: 60px; }
}

/* ---------------- 打印 ---------------- */
@media print {
  body { background: #fff; }
  body::before { display: none; }
  .hd, .side, .ck-tabs, .ck-acts, .ck-bar .btn, .foot, .rd-play { display: none !important; }
  .main { padding: 0; }
  .sec, .hero { padding-top: 0; break-inside: avoid; }
  .ck-panel { border: none; }
  .ck-body { padding: 12px 0; }
  .ck-voc { grid-template-columns: repeat(2, 1fr); }
  .wr-ans { display: block !important; background: #fff; }
  .rv { opacity: 1 !important; transform: none !important; }
}