:root {
  color-scheme: light;
  --bg: #f6f7f3;
  --panel: #ffffff;
  --ink: #17201d;
  --muted: #68746f;
  --line: #dfe5df;
  --primary: #176b5b;
  --primary-strong: #0f4f43;
  --warn: #b84a36;
  --ok: #217a42;
  --gold: #d8a941;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  padding: 0 14px;
}

button:disabled {
  opacity: 0.5;
}

.primary {
  width: 100%;
  border-color: var(--primary);
  background: var(--primary);
  color: white;
  font-weight: 700;
}

.app-shell {
  max-width: 760px;
  margin: 0 auto;
  padding: 14px 14px 94px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: max(12px, env(safe-area-inset-top)) 2px 14px;
}

.topbar h1,
.panel h2,
.login-card h2 {
  margin: 0;
  line-height: 1.15;
  letter-spacing: 0;
}

.eyebrow {
  margin: 0 0 5px;
  color: var(--primary);
  font-size: 12px;
  font-weight: 800;
}

.muted,
.hint {
  color: var(--muted);
}

.hint {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.6;
}

.hidden {
  display: none !important;
}

.login-screen {
  min-height: 68vh;
  display: grid;
  place-items: center;
}

.login-card,
.panel,
.install-card,
.question-card,
.assignment-card,
.score-card,
.result-card,
.user-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.login-card {
  width: 100%;
  padding: 24px;
}

.install-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  margin-bottom: 14px;
  padding: 12px 14px;
}

.install-card strong {
  display: block;
  margin-bottom: 4px;
}

.install-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.install-card.installed {
  border-color: #cfe3d4;
  background: #f4fbf5;
}

.data-notice {
  display: grid;
  gap: 8px;
  margin: 12px 0 16px;
  border: 1px solid #d9c17a;
  border-radius: 8px;
  background: #fff9e7;
  color: #5f4a13;
  padding: 12px;
}

.data-notice strong {
  color: #4f3c0e;
}

.data-notice p {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
}

.ack-row {
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 9px;
  align-items: start;
  margin: 0;
  color: #33413c;
  font-size: 13px;
  font-weight: 800;
  line-height: 1.45;
}

label {
  display: grid;
  gap: 8px;
  margin: 16px 0;
  color: #33413c;
  font-weight: 700;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcf9;
  color: var(--ink);
  padding: 12px;
}

input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin: 2px 0 0;
  accent-color: var(--primary);
}

textarea {
  resize: vertical;
  line-height: 1.6;
}

.icon-button {
  width: 44px;
  min-height: 44px;
  padding: 0;
  font-size: 20px;
}

.panel {
  padding: 16px;
  margin-bottom: 14px;
}

.user-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px;
  margin-bottom: 14px;
}

.user-card h2 {
  margin: 0;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  border-radius: 999px;
  background: #eaf3ed;
  color: var(--ok);
  padding: 0 10px;
  font-size: 12px;
  font-weight: 800;
  white-space: nowrap;
}

.status-pill.warn {
  background: #fff0e9;
  color: var(--warn);
}

.quick-grid {
  display: grid;
  gap: 10px;
}

.quick-action {
  display: grid;
  gap: 5px;
  text-align: left;
  min-height: 76px;
  padding: 14px;
}

.quick-action strong {
  font-size: 18px;
}

.quick-action span,
.assignment-card p,
.score-card p {
  color: var(--muted);
  margin: 0;
}

.section-head,
.exam-bar,
.score-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.section-head h2 {
  font-size: 22px;
}

.question-list,
.assignment-list,
.score-list {
  display: grid;
  gap: 12px;
}

.question-card,
.assignment-card,
.score-card,
.result-card {
  padding: 14px;
}

.question-title {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 10px;
  align-items: start;
  margin-bottom: 12px;
  line-height: 1.5;
}

.question-title span {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #f4e6b8;
  color: #6c5315;
  font-weight: 800;
}

.button-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 10px;
}

.review-banner {
  display: grid;
  gap: 6px;
  border: 1px solid #d9c17a;
  border-radius: 8px;
  background: #fff9e7;
  color: #6c5315;
  padding: 12px;
}

.review-banner button {
  margin-top: 2px;
}

.feedback {
  display: grid;
  gap: 4px;
  margin-top: 10px;
  border-radius: 8px;
  padding: 10px;
  font-size: 14px;
}

.feedback.ok {
  background: #ecf7ef;
  color: var(--ok);
}

.feedback.warn {
  background: #fff0e9;
  color: var(--warn);
}

.answer-line {
  margin: 10px 0 0;
  color: var(--primary-strong);
  line-height: 1.6;
}

.assignment-card {
  display: grid;
  grid-template-columns: 1fr 82px;
  gap: 12px;
  align-items: center;
}

.assignment-card strong {
  display: block;
  margin-bottom: 6px;
}

.warn-text {
  color: var(--warn) !important;
}

.ok-text {
  color: var(--ok);
}

.exam-bar {
  position: sticky;
  top: 0;
  z-index: 2;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.96);
  padding: 12px;
}

.exam-save-status {
  margin: -2px 0 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcf9;
  color: var(--muted);
  padding: 8px 10px;
  font-size: 12px;
  line-height: 1.4;
}

.exam-save-status.saving {
  border-color: #d9c17a;
  background: #fff9e7;
  color: #6c5315;
}

.exam-save-status.saved {
  border-color: #cfe3d4;
  background: #f4fbf5;
  color: var(--ok);
}

.exam-save-status.warn {
  border-color: #f1c4b6;
  background: #fff6f1;
  color: var(--warn);
}

.focus-mode-status {
  margin: -2px 0 12px;
  border: 1px solid #cfe3d4;
  border-radius: 8px;
  background: #f4fbf5;
  color: var(--primary-strong);
  padding: 10px 12px;
  font-size: 13px;
  line-height: 1.45;
}

.focus-mode-status.warn {
  border-color: #f1c4b6;
  background: #fff6f1;
  color: var(--warn);
}

.result-card h3 {
  margin: 0 0 8px;
  font-size: 24px;
}

.summary-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 12px;
}

.summary-strip div {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcf9;
  padding: 12px 8px;
  text-align: center;
}

.summary-strip strong {
  display: block;
  font-size: 20px;
}

.summary-strip span {
  color: var(--muted);
  font-size: 12px;
}

.score-head strong {
  font-size: 20px;
}

.wrongbook-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  border: 1px solid #cfe3d4;
  border-radius: 8px;
  background: #f4fbf5;
  padding: 14px;
}

.wrongbook-card p {
  margin: 6px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.wrongbook-card.muted-card {
  border-color: var(--line);
  background: #fbfcf9;
}

details {
  margin-top: 10px;
}

summary {
  cursor: pointer;
  color: var(--primary);
  font-weight: 800;
}

.wrong-item {
  display: grid;
  gap: 5px;
  margin-top: 10px;
  border-top: 1px solid var(--line);
  padding-top: 10px;
  color: var(--muted);
  line-height: 1.5;
}

.wrong-item strong {
  color: var(--ink);
}

.empty {
  border: 1px dashed #c9d4cf;
  border-radius: 8px;
  color: var(--muted);
  padding: 22px;
  text-align: center;
}

.tabbar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  max-width: 760px;
  margin: 0 auto;
  padding: 10px 14px calc(10px + env(safe-area-inset-bottom));
  border-top: 1px solid var(--line);
  background: rgba(246, 247, 243, 0.96);
  backdrop-filter: blur(12px);
}

.tabbar button {
  min-height: 48px;
  padding: 0;
  font-weight: 800;
}

.tabbar button.active,
.quick-action.active {
  border-color: var(--primary);
  background: #eaf3ed;
  color: var(--primary-strong);
}

.toast {
  position: fixed;
  left: 16px;
  right: 16px;
  bottom: 88px;
  z-index: 20;
  max-width: 520px;
  margin: 0 auto;
  border-radius: 8px;
  background: #17201d;
  color: white;
  padding: 14px 16px;
  text-align: center;
}

@media (min-width: 720px) {
  .quick-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 420px) {
  .summary-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .wrongbook-card {
    grid-template-columns: 1fr;
  }
}