/* English Learning · student web — workbook */
@import url("https://fonts.googleapis.com/css2?family=Fredoka:wght@500;600;700&family=Noto+Sans+SC:wght@400;500;700;800&display=swap");

:root {
  --ink: #1b2430;
  --muted: #5c6b7a;
  --line: #e3d9c8;
  --paper: #f6f1e8;
  --card: #fffdf8;
  --ink-blue: #1e3a5f;
  --coral: #e06c4f;
  --coral-deep: #c45238;
  --ok: #2f7d4a;
  --sky: #3d6ea8;
  --shadow: 0 10px 28px rgba(40, 32, 18, 0.08);
  --radius: 18px;
  --font: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --display: "Fredoka", "Noto Sans SC", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body { min-height: 100%; }

body {
  font-family: var(--font);
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(30, 58, 95, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 58, 95, 0.035) 1px, transparent 1px);
  background-size: 28px 28px;
  line-height: 1.55;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }
code { font-size: 0.9em; }

.wrap {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 22px 0 64px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 22px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--display);
  font-weight: 600;
  letter-spacing: 0.01em;
}
.brand-mark {
  width: 40px; height: 40px; border-radius: 12px;
  background: var(--ink-blue); color: #fff;
  display: grid; place-items: center;
  font-size: 1.15rem;
}
.brand small { display: block; font-family: var(--font); font-size: 0.72rem; color: var(--muted); font-weight: 700; }
.top-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.pill, .btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 14px; border-radius: 12px;
  background: var(--card); border: 1px solid var(--line);
  font-size: 0.86rem; font-weight: 700; color: var(--ink);
}
.pill:hover, .btn:hover { border-color: #c9b89a; }
.pill.on, .btn.on { background: var(--ink-blue); color: #fff; border-color: transparent; }
.btn.ok { background: var(--ok); color: #fff; border-color: transparent; }
.btn.ok.done { background: #245f38; }
.btn.ghost { background: transparent; }

.hero {
  margin-bottom: 28px;
  padding: 8px 2px 4px;
}
.hero-kicker {
  font-size: 0.78rem; font-weight: 800; letter-spacing: .08em;
  color: var(--coral-deep); text-transform: uppercase;
  margin-bottom: 8px;
}
.hero h1 {
  font-family: var(--display);
  font-size: clamp(1.9rem, 5vw, 2.7rem);
  font-weight: 650; line-height: 1.18; max-width: 12em;
  color: var(--ink-blue);
  margin-bottom: 10px;
}
.hero p { max-width: 34em; color: var(--muted); font-size: 1.02rem; }

.section-title {
  display: flex; align-items: baseline; justify-content: space-between; gap: 10px;
  margin: 6px 2px 12px;
}
.section-title h2 { font-family: var(--display); font-size: 1.28rem; font-weight: 600; color: var(--ink-blue); }
.section-title span { color: var(--muted); font-size: 0.84rem; font-weight: 700; }

.filter-row { display: flex; gap: 8px; margin-bottom: 12px; }

.grid-2 {
  display: grid; gap: 14px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.grid-mods {
  display: grid; gap: 12px;
  grid-template-columns: 1fr;
}

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  box-shadow: var(--shadow);
}

.level-card, .mod-card, .lesson-card, .continue-card {
  display: block;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--card);
  padding: 18px 16px;
  box-shadow: var(--shadow);
  transition: transform .15s ease, box-shadow .15s ease;
}
.level-card:hover, .mod-card:hover, .lesson-card:hover, .continue-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 32px rgba(40, 32, 18, 0.12);
}
.level-card h3 {
  font-family: var(--display);
  font-size: 1.7rem; margin-bottom: 4px; color: var(--ink-blue);
}
.level-card p, .mod-card p, .lesson-card p { color: var(--muted); font-size: 0.9rem; }
.level-card .tag {
  display: inline-block; font-size: 0.72rem; font-weight: 800;
  color: var(--coral-deep); background: #fde8e1;
  padding: 3px 8px; border-radius: 999px; margin-bottom: 8px;
}
.level-card.junior .tag { color: var(--sky); background: #e7f0fa; }
.level-card .stat { margin-top: 8px; font-size: 0.8rem; font-weight: 800; color: var(--ink-blue); }

.mod-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-rows: auto auto;
  gap: 4px 14px;
  align-items: center;
}
.mod-card .icon {
  grid-row: 1 / span 2;
  width: 52px; height: 52px; border-radius: 14px;
  display: grid; place-items: center;
  font-family: var(--display); font-size: 1.25rem; color: #fff;
}
.mod-card .mod-copy { grid-column: 2; }
.mod-card .order { font-size: 0.72rem; font-weight: 800; letter-spacing: .04em; color: var(--coral-deep); }
.mod-card h3 { font-family: var(--display); font-size: 1.2rem; color: var(--ink-blue); }
.mod-card .meta { font-size: 0.78rem; font-weight: 800; color: var(--sky); align-self: start; }
.mod-card .progress-bar { grid-column: 2 / span 2; }
.mod-card[data-mod="grammar"] .icon { background: #1e3a5f; }
.mod-card[data-mod="vocabulary"] .icon { background: #3d6ea8; }

.continue-card {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  background: #fff7f3; border-color: #f0c8bb;
  margin-bottom: 18px;
}
.continue-card .eyebrow { display: block; font-size: 0.72rem; font-weight: 800; color: var(--coral-deep); letter-spacing: .04em; }
.continue-card strong { display: block; font-size: 1.12rem; color: var(--ink-blue); }
.continue-card span { color: var(--muted); font-size: 0.84rem; }
.continue-card .go {
  flex-shrink: 0;
  background: var(--coral); color: #fff; border: none;
  padding: 10px 16px; border-radius: 12px; font-weight: 800;
}

.lesson-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px; align-items: center;
}
.lesson-card .num {
  width: 46px; height: 46px; border-radius: 12px;
  background: #efe6d6; color: var(--ink-blue);
  display: grid; place-items: center; font-weight: 800; font-family: var(--display);
}
.lesson-card.done .num { background: #d9eedf; color: var(--ok); }
.lesson-card h3 { font-size: 1.02rem; color: var(--ink-blue); }
.lesson-card .en { font-size: 0.78rem; color: #7a6a58; }
.lesson-card .chip {
  display: inline-block; margin-top: 6px;
  font-size: 0.72rem; font-weight: 800;
  color: #8a6a2a; background: #f6e7c1; padding: 2px 8px; border-radius: 999px;
}
.check {
  width: 28px; height: 28px; border-radius: 50%;
  border: 2px solid #d7cbb8; display: grid; place-items: center;
  color: transparent; font-size: 0.85rem; font-weight: 800;
}
.lesson-card.done .check { background: var(--ok); border-color: var(--ok); color: #fff; }

.progress-bar {
  height: 8px; border-radius: 999px; background: #efe6d6; overflow: hidden; margin-top: 8px;
}
.progress-bar > i {
  display: block; height: 100%; width: 0;
  background: linear-gradient(90deg, var(--ink-blue), var(--coral));
  border-radius: inherit;
  transition: width .35s ease;
}

.empty { text-align: center; color: var(--muted); padding: 28px 12px; font-weight: 700; }
.footer-note { margin-top: 28px; text-align: center; color: var(--muted); font-size: 0.8rem; font-weight: 600; }

.draft-card {
  background: var(--card); border: 1px dashed #c9b89a; border-radius: 18px;
  padding: 28px 22px; text-align: center;
}
.draft-card .kicker { color: var(--coral-deep); font-weight: 800; font-size: 0.78rem; letter-spacing: .08em; }
.draft-card h2 { font-family: var(--display); color: var(--ink-blue); margin: 8px 0 10px; }

.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%) translateY(16px);
  background: var(--ink-blue); color: #fff;
  padding: 10px 16px; border-radius: 12px; font-weight: 700; font-size: 0.88rem;
  opacity: 0; pointer-events: none; transition: .2s ease; z-index: 40;
  max-width: min(90vw, 420px); text-align: center;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* lesson chrome */
body.page-lesson {
  background: #efe8dc;
  background-image: none;
}
.lesson-shell {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
}
.lesson-top, .lesson-bottom {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 10px 16px;
  background: rgba(255,253,248,.92);
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
  position: sticky; top: 0; z-index: 8;
  backdrop-filter: blur(8px);
}
.lesson-bottom {
  position: sticky; top: auto; bottom: 0;
  border-bottom: 0; border-top: 1px solid var(--line);
}
.lesson-top .title-block h1 { font-size: 1.05rem; color: var(--ink-blue); }
.lesson-top .title-block p { font-size: 0.78rem; color: var(--muted); }
.viewer-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.lesson-scroll {
  width: min(760px, calc(100% - 28px));
  margin: 18px auto 28px;
}

.ls-head { margin-bottom: 18px; }
.ls-head .kicker { font-size: 0.78rem; font-weight: 800; color: var(--coral-deep); letter-spacing: .04em; }
.ls-head h1 {
  font-family: var(--display); font-size: clamp(1.7rem, 4vw, 2.2rem);
  color: var(--ink-blue); line-height: 1.2; margin: 4px 0 8px;
}
.ls-head .lead { font-size: 1.05rem; color: var(--muted); }

.ls-section { margin: 22px 0; }
.ls-section h2 {
  font-family: var(--display); font-size: 1.2rem; color: var(--ink-blue);
  margin-bottom: 10px; padding-bottom: 6px; border-bottom: 2px solid #efe0cc;
}
.ls-p { margin: 8px 0 12px; font-size: 1rem; }
.ls-list { margin: 8px 0 12px 1.15em; }
.ls-list li { margin: 4px 0; }

.ls-formula {
  background: #eef3f9; border-left: 4px solid var(--ink-blue);
  border-radius: 0 12px 12px 0; padding: 12px 14px; margin: 10px 0;
}
.ls-formula .main { font-weight: 800; color: var(--ink-blue); }
.ls-formula .note { font-size: 0.88rem; color: var(--muted); margin-top: 4px; }

.ls-ex {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 12px; padding: 12px 14px; margin: 10px 0;
}
.ls-ex .en { font-weight: 800; color: var(--ink); }
.ls-ex .cn { font-size: 0.9rem; color: var(--muted); margin-top: 4px; }

.ls-judge, .ls-warn {
  border-radius: 14px; padding: 14px 16px; margin: 14px 0;
}
.ls-judge { background: #e8f1e9; }
.ls-warn { background: #fdeee8; }
.ls-judge h3, .ls-warn h3 { font-size: 0.92rem; margin-bottom: 6px; }
.ls-judge h3 { color: var(--ok); }
.ls-warn h3 { color: var(--coral-deep); }

.ls-steps { list-style: none; display: grid; gap: 10px; margin: 12px 0; }
.ls-steps li {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 12px; padding: 12px 14px;
}
.ls-steps strong { display: block; color: var(--ink-blue); margin-bottom: 4px; }
.ls-steps span { color: var(--muted); font-size: 0.92rem; }

.ls-table-wrap { overflow-x: auto; margin: 12px 0; }
.ls-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; background: var(--card); }
.ls-table th, .ls-table td {
  border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top;
}
.ls-table th { background: #efe6d6; color: var(--ink-blue); font-weight: 800; }

.ls-practice {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 14px; padding: 14px 16px; margin: 16px 0;
}
.ls-practice h3 { font-size: 1rem; color: var(--ink-blue); margin-bottom: 8px; }
.ls-ans { margin-top: 10px; }
.ls-ans summary { cursor: pointer; font-weight: 800; color: var(--sky); }
.ls-ans p { margin-top: 8px; background: #eef3f9; padding: 8px 10px; border-radius: 8px; }

.ls-words { list-style: none; display: grid; gap: 8px; }
.ls-word {
  display: grid; grid-template-columns: 1fr auto auto; gap: 8px; align-items: baseline;
  background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 8px 12px;
  cursor: pointer;
}
.ls-word .w { font-weight: 800; }
.ls-word.is-ex .w { color: var(--coral-deep); }
.ls-word .ph { color: var(--muted); font-size: 0.82rem; }
.ls-word .tag { font-size: 0.7rem; font-weight: 800; color: var(--muted); }
.ls-word .mark { font-weight: 800; color: #c4b49a; }
.ls-word.known { border-color: #9dceb0; background: #f3faf5; }
.ls-word.known .mark { color: var(--ok); }

.theme-group { margin-bottom: 22px; }
.theme-group-title {
  font-family: var(--display);
  font-size: 1.15rem;
  color: var(--ink-blue);
  margin: 4px 2px 12px;
}
.theme-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
}
.theme-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px 14px;
  box-shadow: var(--shadow);
  min-height: 118px;
  transition: transform .15s ease, box-shadow .15s ease;
}
.theme-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 32px rgba(40, 32, 18, 0.12);
}
.theme-card h3 {
  font-family: var(--display);
  font-size: 1.05rem;
  color: var(--ink-blue);
  line-height: 1.3;
}
.theme-card p { color: var(--muted); font-size: 0.84rem; font-weight: 700; }
.theme-card .theme-go, .theme-card .theme-done {
  margin-top: auto;
  font-size: 0.8rem;
  font-weight: 800;
}
.theme-card .theme-go { color: var(--coral-deep); }
.theme-card .theme-done { color: var(--ok); }
.theme-card.done { border-color: #9dceb0; background: #f3faf5; }

.word-drill { margin-bottom: 28px; }
.drill-hint { color: var(--muted); font-size: 0.9rem; margin: 0 0 12px; }
.drill-progress { margin-bottom: 14px; }
.drill-count { font-size: 0.84rem; font-weight: 800; color: var(--ink-blue); }
.drill-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 28px 20px 18px;
  text-align: center;
  box-shadow: var(--shadow);
  min-height: 160px;
  cursor: pointer;
  user-select: none;
}
.drill-card.empty { color: var(--muted); }
.drill-tag {
  display: inline-block;
  font-size: 0.72rem; font-weight: 800;
  padding: 3px 8px; border-radius: 999px; margin-bottom: 10px;
  background: #efe6d6; color: var(--ink-blue);
}
.drill-tag.is-ex { background: #fde8e1; color: var(--coral-deep); }
.drill-en {
  font-family: var(--display);
  font-size: clamp(1.6rem, 5vw, 2.2rem);
  color: var(--ink-blue);
  line-height: 1.25;
  margin-bottom: 8px;
}
.drill-cn { font-size: 1.1rem; color: var(--muted); min-height: 1.4em; }
.drill-speak {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 12px;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #f7f1e6;
  color: var(--ink-blue);
  font-size: 0.88rem;
  font-weight: 800;
  cursor: pointer;
}
.drill-speak:hover { background: #efe6d6; }
.drill-card.empty .drill-speak { display: none; }
.drill-tip { margin-top: 14px; font-size: 0.75rem; color: #9a8b78; font-weight: 700; }
.drill-actions {
  display: grid; grid-template-columns: 1fr 1fr; gap: 10px;
  margin: 14px 0 16px;
}
.drill-actions .btn { justify-content: center; padding: 14px 12px; font-size: 1rem; }
.drill-actions .drill-yes { background: var(--ok); color: #fff; border-color: transparent; }
.drill-filters { display: flex; gap: 8px; margin-bottom: 10px; flex-wrap: wrap; }

@media (max-width: 720px) {
  .grid-2 { grid-template-columns: 1fr; }
  .lesson-card { grid-template-columns: auto 1fr; }
  .lesson-card .check { grid-column: 2; justify-self: start; }
  .mod-card { grid-template-columns: auto 1fr; }
  .mod-card .meta { grid-column: 2; }
}