:root {
  --ink: #20332f;
  --muted: #66736f;
  --paper: #f7f3ea;
  --surface: #fffdf8;
  --line: #ded7ca;
  --gold: #f0c45a;
  --coral: #d95f47;
  --blue: #557ca8;
  --green: #547d68;
  --shadow: 0 16px 40px rgba(32, 51, 47, 0.12);
  color-scheme: light;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--paper);
}

body {
  min-height: 100%;
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(84, 125, 104, 0.18), rgba(247, 243, 234, 0) 280px),
    var(--paper);
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  width: min(1120px, 100%);
  margin: 0 auto;
  padding: 18px clamp(14px, 3vw, 28px) 42px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 12px 0 18px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--coral);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1.05;
  letter-spacing: 0;
}

.icon-button {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  border: 1px solid rgba(32, 51, 47, 0.16);
  border-radius: 8px;
  color: var(--surface);
  background: var(--ink);
  box-shadow: var(--shadow);
}

.account-initial {
  font-weight: 900;
}

.hero-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 118px;
  align-items: center;
  gap: 18px;
  padding: clamp(18px, 4vw, 30px);
  border: 1px solid rgba(32, 51, 47, 0.1);
  border-radius: 8px;
  background: linear-gradient(135deg, #20332f 0%, #315847 58%, #d95f47 140%);
  color: #fffaf0;
  box-shadow: var(--shadow);
}

.hero-copy h2 {
  margin-bottom: 8px;
  font-size: clamp(25px, 4.8vw, 42px);
  line-height: 1.12;
  letter-spacing: 0;
}

.hero-copy p {
  margin-bottom: 0;
}

.hero-kicker {
  color: #f5d06f;
  font-weight: 800;
}

.progress-ring {
  position: relative;
  display: grid;
  width: 112px;
  height: 112px;
  place-items: center;
}

.progress-ring svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.progress-ring circle {
  fill: none;
  stroke-width: 12;
}

.ring-bg {
  stroke: rgba(255, 250, 240, 0.24);
}

.ring-value {
  stroke: var(--gold);
  stroke-linecap: round;
  stroke-dasharray: 314;
  stroke-dashoffset: 314;
  transition: stroke-dashoffset 220ms ease;
}

.progress-ring strong {
  position: relative;
  z-index: 1;
  font-size: 22px;
}

.mode-tabs {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  margin: 18px 0;
}

.mode-tab,
.primary-button,
.ghost-button,
.rating-button {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-weight: 800;
}

.mode-tab {
  color: var(--ink);
  background: rgba(255, 253, 248, 0.72);
}

.mode-tab.is-active {
  border-color: var(--ink);
  color: #fffaf0;
  background: var(--ink);
}

.toolbar {
  display: grid;
  grid-template-columns: minmax(180px, 0.7fr) minmax(220px, 1.3fr);
  gap: 12px;
  margin-bottom: 14px;
}

.field {
  display: grid;
  gap: 6px;
}

.field span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.field input,
.field select {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 12px;
  color: var(--ink);
  background: var(--surface);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin: 12px 0 14px;
}

.stat-tile {
  min-width: 0;
  padding: 14px;
  border-radius: 8px;
  color: #fffaf0;
  background: var(--green);
}

.stat-tile span {
  display: block;
  margin-bottom: 4px;
  font-size: 12px;
  font-weight: 800;
  opacity: 0.86;
}

.stat-tile strong {
  font-size: clamp(20px, 4vw, 30px);
}

.accent-gold {
  color: var(--ink);
  background: var(--gold);
}

.accent-coral {
  background: var(--coral);
}

.accent-blue {
  background: var(--blue);
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-height: 34px;
  margin: 8px 0 16px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 30px;
  border: 1px solid rgba(32, 51, 47, 0.14);
  border-radius: 8px;
  padding: 0 10px;
  color: var(--ink);
  background: #fff6dc;
  font-size: 13px;
  font-weight: 800;
}

.card-list {
  display: grid;
  gap: 14px;
}

.review-card {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(32, 51, 47, 0.12);
  border-radius: 8px;
  padding: clamp(16px, 4vw, 24px);
  background: var(--surface);
  box-shadow: 0 12px 28px rgba(32, 51, 47, 0.08);
}

.review-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 6px;
  background: var(--green);
}

.review-card.priority-5::before,
.review-card.priority-4::before {
  background: var(--coral);
}

.review-card.priority-3::before {
  background: var(--gold);
}

.star-button {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: #fffaf0;
  font-size: 23px;
  line-height: 1;
}

.star-button.is-starred {
  color: #8a5a00;
  background: #ffe7a3;
}

.card-meta,
.source-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding-right: 42px;
}

.pill,
.source-pill {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  border-radius: 8px;
  padding: 0 9px;
  color: var(--ink);
  background: #edf2ed;
  font-size: 12px;
  font-weight: 800;
}

.pill.hot {
  color: #fffaf0;
  background: var(--coral);
}

.pill.exam {
  color: #fffaf0;
  background: var(--blue);
}

.pill.gray {
  background: #e3e1dd;
}

.source-pill {
  color: var(--muted);
  background: transparent;
  border: 1px dashed var(--line);
}

.card-prompt {
  margin: 14px 44px 14px 0;
  font-size: clamp(21px, 4vw, 30px);
  line-height: 1.34;
  letter-spacing: 0;
}

.card-section {
  display: none;
  margin-top: 12px;
  border-radius: 8px;
  padding: 14px;
  line-height: 1.72;
  white-space: pre-wrap;
}

.card-section.is-visible {
  display: block;
}

.card-hint {
  border: 1px solid #ead493;
  background: #fff4ce;
}

.card-answer {
  border: 1px solid #ccd8d1;
  background: #f0f6f2;
}

.source-strip {
  margin-top: 12px;
}

.rating-row {
  display: none;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: 14px;
}

.rating-row.is-visible {
  display: grid;
}

.rating-button {
  color: var(--ink);
  background: #fffaf0;
}

.rating-button.again {
  border-color: rgba(217, 95, 71, 0.46);
}

.rating-button.hard {
  border-color: rgba(240, 196, 90, 0.7);
}

.rating-button.easy {
  border-color: rgba(84, 125, 104, 0.5);
}

.empty-state {
  border: 1px dashed var(--line);
  border-radius: 8px;
  padding: 26px;
  text-align: center;
  color: var(--muted);
  background: rgba(255, 253, 248, 0.7);
}

.session-dialog {
  width: min(460px, calc(100% - 28px));
  border: 0;
  border-radius: 8px;
  padding: 0;
  color: var(--ink);
  background: transparent;
}

.session-dialog::backdrop {
  background: rgba(20, 30, 28, 0.48);
  backdrop-filter: blur(2px);
}

.session-box {
  display: grid;
  gap: 14px;
  margin: 0;
  border: 1px solid rgba(32, 51, 47, 0.14);
  border-radius: 8px;
  padding: 22px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.session-box h2 {
  margin-bottom: 0;
}

.session-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.session-tab {
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: #fffaf0;
  font-weight: 800;
}

.session-tab.is-active {
  color: #fffaf0;
  background: var(--ink);
}

.session-message {
  min-height: 22px;
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.dialog-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.primary-button {
  color: #fffaf0;
  border-color: var(--ink);
  background: var(--ink);
}

.ghost-button {
  color: var(--ink);
  background: #fffaf0;
}

.sync-card {
  display: grid;
  gap: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: #fff4ce;
}

.sync-card span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.sync-card strong {
  font-size: 24px;
  letter-spacing: 0;
}

.is-hidden {
  display: none !important;
}

@media (max-width: 760px) {
  .app-shell {
    padding-bottom: 26px;
  }

  .hero-panel {
    grid-template-columns: 1fr;
  }

  .progress-ring {
    width: 96px;
    height: 96px;
  }

  .mode-tabs {
    grid-template-columns: repeat(5, minmax(58px, 1fr));
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .mode-tab {
    min-width: 58px;
    padding: 0 6px;
  }

  .toolbar,
  .stat-grid {
    grid-template-columns: 1fr 1fr;
  }

  .search-field {
    grid-column: 1 / -1;
  }
}

@media (max-width: 480px) {
  .topbar {
    align-items: flex-start;
  }

  .stat-grid {
    grid-template-columns: 1fr 1fr;
  }

  .review-card {
    padding: 16px 14px 16px 18px;
  }

  .card-prompt {
    margin-right: 36px;
    font-size: 21px;
  }

  .rating-row,
  .dialog-actions {
    grid-template-columns: 1fr;
  }
}