:root {
  --paper: #fbf7ed;
  --ink: #1f241d;
  --muted: #6b6357;
  --green: #1f6b4b;
  --green-deep: #174b36;
  --gold: #a96f1d;
  --line: rgba(69, 55, 34, 0.14);
  --panel: rgba(255, 252, 245, 0.88);
  --shadow: 0 20px 56px rgba(61, 43, 20, 0.10);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 18% 0%, rgba(169, 111, 29, 0.16), transparent 32%),
    radial-gradient(circle at 84% 10%, rgba(31, 107, 75, 0.16), transparent 30%),
    linear-gradient(135deg, #efe0c4 0%, #fbf7ed 44%, #f7efe1 100%);
  font-family: "Source Han Serif SC", "Noto Serif CJK SC", "Songti SC", serif;
}
a { color: inherit; }
.learning-shell { width: min(1180px, calc(100% - 24px)); margin: 0 auto; padding: 14px 0 28px; }
.learning-topbar {
  display: flex; justify-content: space-between; align-items: center; gap: 14px;
  padding: 12px 14px; border: 1px solid var(--line); border-radius: 26px;
  background: rgba(255, 250, 240, 0.78); box-shadow: var(--shadow); backdrop-filter: blur(18px);
}
.learning-brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; min-width: 0; }
.learning-brand img { width: 42px; height: 42px; border-radius: 15px; object-fit: cover; }
.learning-brand strong, .learning-brand em { display: block; }
.learning-brand strong { font-size: 18px; letter-spacing: 0.02em; }
.learning-brand em { margin-top: 2px; color: var(--muted); font-style: normal; font-size: 12px; }
.learning-nav { display: flex; gap: 8px; flex-wrap: wrap; }
.learning-nav a, .primary-link, .secondary-link {
  border: 1px solid var(--line); border-radius: 999px; padding: 9px 14px;
  color: var(--ink); background: rgba(255,255,255,0.55); text-decoration: none;
  font: 700 13px/1.1 "IBM Plex Sans", "Noto Sans SC", sans-serif;
}
.primary-link { display: inline-flex; justify-content: center; color: #fff; background: var(--green); border-color: var(--green); }
.secondary-link { display: inline-flex; justify-content: center; color: var(--green-deep); background: rgba(235,247,238,0.72); }
.learning-main { display: grid; gap: 16px; padding-top: 16px; }
.learning-hero { padding: 28px clamp(18px, 4vw, 44px); border: 1px solid var(--line); border-radius: 32px; background: rgba(255, 252, 245, 0.72); box-shadow: var(--shadow); }
.eyebrow { margin: 0 0 8px; color: var(--gold); text-transform: uppercase; letter-spacing: .12em; font: 800 12px/1 "IBM Plex Sans", sans-serif; }
.learning-hero h1 { margin: 0; color: var(--green-deep); font-size: clamp(30px, 5vw, 56px); line-height: 1.12; }
.learning-hero p:last-child { max-width: 720px; color: var(--muted); font-size: 17px; line-height: 1.8; }
.learning-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; align-items: stretch; }
.learning-card { display: grid; gap: 14px; align-content: start; padding: 18px; border: 1px solid var(--line); border-radius: 24px; background: var(--panel); box-shadow: 0 14px 36px rgba(61,43,20,.08); }
.continue-card, .recent-card { grid-column: span 2; }
.full-card { margin-top: 2px; }
.card-head { display: flex; gap: 10px; align-items: center; }
.card-head span { display: inline-grid; place-items: center; min-width: 34px; height: 28px; padding: 0 9px; border-radius: 999px; color: var(--gold); background: rgba(169,111,29,.10); font: 800 12px/1 "IBM Plex Sans", sans-serif; }
.card-head h2 { margin: 0; font-size: 20px; line-height: 1.3; color: var(--green-deep); }
.card-body { color: #334039; line-height: 1.75; }
.continue-title { margin: 0 0 6px; font-size: 22px; color: var(--ink); }
.continue-meta { color: var(--muted); font-size: 14px; line-height: 1.65; }
.progress-line { height: 8px; border-radius: 999px; background: rgba(69,55,34,.10); overflow: hidden; margin: 12px 0 2px; }
.progress-line span { display: block; height: 100%; width: 0%; background: linear-gradient(90deg, var(--green), var(--gold)); border-radius: inherit; }
.metric-row { display: grid; gap: 8px; }
.metric { display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 10px 12px; border-radius: 16px; background: rgba(255,255,255,.50); color: #334039; font-size: 14px; }
.metric strong { color: var(--green-deep); font-size: 22px; }
.review-card-list { display: grid; gap: 9px; }
.review-item { display: grid; gap: 8px; padding: 12px; border: 1px solid rgba(31,107,75,.12); border-radius: 18px; background: rgba(255,255,255,.46); }
.review-item strong { color: var(--ink); font-size: 15px; line-height: 1.45; }
.review-item p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.55; }
.review-item small { color: rgba(31,107,75,.78); font: 800 12px/1.3 "IBM Plex Sans", sans-serif; }
.review-actions { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.review-actions a,
.review-actions button { border: 1px solid rgba(69,55,34,.14); border-radius: 999px; padding: 7px 10px; color: var(--green-deep); background: rgba(255,255,255,.58); text-decoration: none; font: 800 12px/1.1 "IBM Plex Sans", "Noto Sans SC", sans-serif; cursor: pointer; }
.review-actions button:hover,
.review-actions a:hover { border-color: rgba(31,107,75,.28); background: rgba(235,247,238,.72); }
.review-actions button:disabled { opacity: .55; cursor: not-allowed; }
.recent-list { display: grid; gap: 8px; }
.learning-item { display: grid; gap: 4px; padding: 11px 12px; border: 1px solid rgba(69,55,34,.10); border-radius: 17px; background: rgba(255,255,255,.46); text-decoration: none; }
.learning-item strong { color: var(--ink); font-size: 15px; line-height: 1.45; }
.learning-item span { color: var(--muted); font-size: 13px; line-height: 1.55; }
.learning-item small { color: rgba(31,107,75,.78); font: 800 12px/1.3 "IBM Plex Sans", sans-serif; }
.empty-note { color: var(--muted); line-height: 1.7; }
@media (max-width: 860px) {
  .learning-shell { width: 100%; padding: 8px 14px calc(18px + env(safe-area-inset-bottom)); }
  .learning-topbar { position: sticky; top: 8px; z-index: 10; border-radius: 22px; }
  .learning-brand em { display: none; }
  .learning-nav { display: none; }
  .learning-hero { padding: 22px 18px; border-radius: 26px; }
  .learning-grid { grid-template-columns: 1fr; }
  .continue-card, .recent-card { grid-column: span 1; }
  .learning-card { padding: 15px; border-radius: 22px; }
  .continue-title { font-size: 19px; }
}