:root {
  --bg: #f7f8f5;
  --panel: #ffffff;
  --ink: #172326;
  --muted: #5d6b70;
  --line: #dfe6e2;
  --brand: #25636f;
  --brand-dark: #164751;
  --accent: #c45f32;
  --green: #457a50;
  --focus: #f1bd4f;
  --shadow: 0 10px 24px rgba(23, 35, 38, 0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "PingFang SC", Arial, sans-serif;
  line-height: 1.55;
  letter-spacing: 0;
}
a { color: var(--brand-dark); }
button, input, select, textarea { font: inherit; }
button, a.button { min-height: 44px; }

.skip-link {
  position: absolute;
  top: -48px;
  left: 12px;
  background: var(--ink);
  color: #fff;
  padding: 10px 14px;
  z-index: 10;
}
.skip-link:focus { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  background: rgba(247, 248, 245, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}
.brand a {
  display: block;
  color: var(--ink);
  font-weight: 800;
  font-size: 1.1rem;
  text-decoration: none;
}
.brand span {
  display: block;
  color: var(--muted);
  font-size: 0.78rem;
}
.menu-toggle {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 8px;
  padding: 8px 12px;
}
.site-nav {
  display: none;
  position: absolute;
  left: 12px;
  right: 12px;
  top: 64px;
  padding: 10px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}
.site-nav.open { display: grid; }
.site-nav a {
  padding: 11px 10px;
  border-radius: 8px;
  color: var(--ink);
  text-decoration: none;
  font-size: 0.95rem;
}
.site-nav a:hover, .site-nav a.active { background: #eaf2ef; color: var(--brand-dark); }

main {
  width: min(1120px, 100%);
  margin: 0 auto;
  padding: 18px 14px 42px;
}
.page { display: none; animation: enter 180ms ease-out; }
.page.active { display: block; }
@keyframes enter { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }

.hero {
  display: grid;
  gap: 18px;
  padding: 18px 0 12px;
}
.eyebrow {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}
h1, h2, h3 { line-height: 1.18; margin: 0; letter-spacing: 0; }
h1 { font-size: clamp(2rem, 8vw, 4.3rem); }
.page-title {
  display: grid;
  gap: 8px;
  margin: 14px 0 18px;
}
.page-title h1 { font-size: clamp(1.8rem, 7vw, 3.4rem); }
.subtitle { margin: 10px 0 0; font-size: 1.25rem; font-weight: 700; }
.cn-subtitle, .page-title p, .panel p, .card p { color: var(--muted); }
.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 12px;
  margin: 26px 0 12px;
}
.section-head span {
  color: var(--muted);
  white-space: nowrap;
}
.grid { display: grid; gap: 12px; }
.cards, .quick-grid { grid-template-columns: 1fr; }
.card, .panel, .accordion {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}
.card, .panel { padding: 15px; }
.card h3, .panel h2 { margin-bottom: 8px; }
.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 10px 0;
}
.chip {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 4px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #f3f6f2;
  color: var(--muted);
  font-size: 0.86rem;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 13px;
  background: var(--panel);
  color: var(--ink);
  text-decoration: none;
  cursor: pointer;
}
.button.primary {
  border-color: var(--brand);
  background: var(--brand);
  color: #fff;
}
.button.danger { color: #8f2f25; border-color: #efc5bd; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; margin: 12px 0; }

.search-box {
  display: grid;
  gap: 8px;
  align-self: start;
}
.search-box label { font-weight: 800; }
input, select, textarea {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  padding: 10px 11px;
}
textarea { resize: vertical; }
:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}
.search-results {
  display: grid;
  gap: 6px;
}
.search-results a {
  display: block;
  padding: 10px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  text-decoration: none;
}

.exam-map {
  display: grid;
  gap: 12px;
}
.exam-paper {
  border-left: 5px solid var(--brand);
}
.stack { display: grid; gap: 12px; }
.compact { gap: 8px; }
.accordion summary {
  display: grid;
  gap: 4px;
  padding: 15px;
  cursor: pointer;
  list-style: none;
}
.accordion summary::-webkit-details-marker { display: none; }
.accordion summary h2, .accordion summary h3 { font-size: 1.05rem; }
.accordion-body {
  border-top: 1px solid var(--line);
  padding: 15px;
}
.two-col {
  display: grid;
  gap: 12px;
}
ul, ol { padding-left: 1.15rem; }
li + li { margin-top: 5px; }
.save-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 12px;
}
.review-button.reviewed {
  border-color: var(--green);
  background: #e9f4ea;
}
.jump {
  position: sticky;
  top: 65px;
  z-index: 4;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 9px 0 11px;
  background: var(--bg);
}
.jump a {
  flex: 0 0 auto;
  min-height: 38px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  text-decoration: none;
  color: var(--ink);
  font-size: 0.9rem;
}

.phrase-list {
  display: grid;
  gap: 8px;
}
.phrase {
  padding: 10px;
  border-left: 3px solid var(--accent);
  background: #fff7f1;
  border-radius: 6px;
}
.resource-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  text-decoration: none;
  background: #fbfcfa;
}
.official-label { color: var(--green); font-weight: 800; font-size: 0.86rem; }

.timer-panel {
  display: grid;
  gap: 12px;
  justify-items: center;
  margin-bottom: 16px;
  padding: 18px;
  border: 1px solid var(--line);
  background: var(--brand-dark);
  color: #fff;
  border-radius: 8px;
}
.timer-display {
  font-size: clamp(3.6rem, 19vw, 7rem);
  font-weight: 900;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.timer-controls { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }

.form-grid {
  display: grid;
  gap: 12px;
}
.form-grid label {
  display: grid;
  gap: 6px;
  font-weight: 700;
}
.wide { grid-column: 1 / -1; }
.filters {
  display: grid;
  gap: 10px;
  margin: 16px 0;
}
.list { display: grid; gap: 10px; margin-top: 12px; }
.list-item {
  display: grid;
  gap: 8px;
  padding: 13px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.completion {
  margin-top: 12px;
  padding: 12px;
  border-radius: 8px;
  background: #eaf2ef;
  font-weight: 800;
}
.progress-summary {
  display: grid;
  gap: 9px;
}
.progress-line {
  display: grid;
  gap: 5px;
}
.bar {
  height: 10px;
  border-radius: 999px;
  overflow: hidden;
  background: #e2e8e5;
}
.bar > span {
  display: block;
  height: 100%;
  background: var(--brand);
}
.empty {
  color: var(--muted);
  padding: 14px;
  border: 1px dashed var(--line);
  border-radius: 8px;
}
.site-footer {
  max-width: 1120px;
  margin: 0 auto;
  padding: 24px 14px 36px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

@media (min-width: 760px) {
  .menu-toggle { display: none; }
  .site-header { align-items: start; }
  .site-nav {
    position: static;
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    padding: 0;
    box-shadow: none;
    border: 0;
    background: transparent;
  }
  .site-nav a { padding: 8px 9px; font-size: 0.88rem; }
  main { padding-inline: 22px; }
  .hero { grid-template-columns: minmax(0, 1.3fr) minmax(280px, 0.7fr); align-items: end; }
  .cards, .quick-grid, .exam-map { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .two-col, .filters { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .form-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1040px) {
  .cards, .quick-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

.rule-box {
  margin: 12px 0;
  padding: 12px;
  border: 1px solid #f0c983;
  border-left: 4px solid var(--focus);
  border-radius: 8px;
  background: #fff9e8;
}

.mini-card {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfa;
}

.mini-card h3,
.mini-card h4 {
  margin: 0 0 8px;
}

.inline-jump {
  position: static;
  margin: 4px 0 12px;
}

.vocab-table {
  display: grid;
  gap: 8px;
}

.vocab-table > div {
  display: grid;
  gap: 3px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfa;
}

.vocab-table strong {
  color: var(--brand-dark);
}

.vocab-table span {
  color: var(--muted);
}

.vocab-table em {
  font-style: normal;
}

@media (min-width: 760px) {
  .vocab-table {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.access-note {
  margin: 0 0 14px;
  padding: 12px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--brand);
  border-radius: 8px;
  background: #f3f8f6;
}

.access-note h3 {
  margin: 0 0 6px;
}

.access-note p {
  margin: 5px 0;
  color: var(--muted);
}

.resource-card {
  display: grid;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfa;
}

.resource-card-head {
  display: grid;
  gap: 8px;
}

.resource-card-head h3 {
  margin: 0 0 6px;
}

.resource-options {
  display: grid;
  gap: 8px;
}

.resource-option {
  display: grid;
  gap: 8px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.resource-option.china {
  border-color: #b8d7c1;
  background: #f1faf3;
}

.resource-option p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.resource-option .button {
  width: 100%;
}

@media (min-width: 760px) {
  .resource-card-head,
  .resource-option {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
  .resource-option .button {
    width: auto;
  }
}

.practice-record {
  margin-top: 14px;
  box-shadow: none;
}

.calendar-head {
  margin: 0 0 10px;
}

.calendar-weekdays,
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 4px;
}

.calendar-weekdays span {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 800;
  text-align: center;
}

.calendar-cell {
  min-height: 42px;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
  color: var(--ink);
}

.calendar-cell.blank {
  visibility: hidden;
}

.calendar-cell.future {
  background: #f3f5f1;
  color: #9aa4a0;
}

.calendar-cell.today {
  border-color: var(--brand);
  box-shadow: inset 0 0 0 1px var(--brand);
}

.calendar-cell.partial .calendar-status {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.calendar-cell.complete {
  background: #e9f4ea;
  border-color: #9bc5a3;
}

.calendar-cell.complete .calendar-status {
  color: var(--green);
  font-size: 1rem;
  font-weight: 900;
}

.calendar-day {
  font-size: 0.86rem;
  font-weight: 800;
}

.calendar-status {
  min-height: 1em;
  line-height: 1;
}

@media (max-width: 380px) {
  .calendar-cell {
    min-height: 38px;
    border-radius: 6px;
  }
  .calendar-weekdays span,
  .calendar-cell.partial .calendar-status {
    font-size: 0.72rem;
  }
}