:root {
  color-scheme: light;
  --bg: #eef4ed;
  --ink: #17201a;
  --muted: #5d695f;
  --paper: #fbfcf4;
  --paper-2: #ffffff;
  --line: #c7d4c8;
  --green: #1f7a4a;
  --green-dark: #115a36;
  --red: #c53a2e;
  --cyan: #087d83;
  --gold: #be8a23;
  --shadow: 0 18px 45px rgba(23, 32, 26, 0.12);
  --radius: 8px;
  --sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --serif: "Noto Serif SC", "Songti SC", serif;
}

body.dark {
  color-scheme: dark;
  --bg: #101713;
  --ink: #eef6ee;
  --muted: #a8b7ab;
  --paper: #17231c;
  --paper-2: #1e2b24;
  --line: #365242;
  --green: #48b778;
  --green-dark: #73d49b;
  --red: #f06b5e;
  --cyan: #50c8ce;
  --gold: #e6b85a;
  --shadow: 0 18px 45px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(90deg, rgba(31, 122, 74, 0.08) 1px, transparent 1px),
    linear-gradient(rgba(31, 122, 74, 0.06) 1px, transparent 1px),
    var(--bg);
  background-size: 42px 42px;
  color: var(--ink);
  font-family: var(--sans);
}

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

button {
  cursor: pointer;
}

a {
  color: var(--green-dark);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.app-shell {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  min-height: 100vh;
}

.rail {
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
  height: 100vh;
  padding: 22px 12px;
  background: var(--ink);
  color: var(--paper);
  border-right: 1px solid rgba(255, 255, 255, 0.12);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 46px;
  aspect-ratio: 1;
  background: var(--paper);
  color: var(--ink);
  border: 2px solid var(--green);
  border-radius: 50%;
  font-family: var(--serif);
  font-weight: 900;
}

.rail-nav {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 20px;
}

.nav-dot,
.icon-button {
  display: grid;
  place-items: center;
  border: 0;
  color: currentColor;
  background: transparent;
}

.nav-dot {
  width: 42px;
  aspect-ratio: 1;
  border-radius: 50%;
}

.nav-dot span {
  display: block;
  width: 12px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.42;
  transition: transform 160ms ease, opacity 160ms ease, background 160ms ease;
}

.nav-dot:hover span,
.nav-dot.active span {
  opacity: 1;
  transform: scale(1.2);
  background: var(--green);
}

.icon-button {
  width: 42px;
  aspect-ratio: 1;
  border-radius: 50%;
  margin-top: auto;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.icon-button svg {
  width: 21px;
  height: 21px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
}

main {
  width: min(1480px, 100%);
  margin-inline: auto;
  padding: 28px;
}

.screen {
  display: none;
  animation: rise 360ms ease both;
}

.screen.active {
  display: block;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.topbar,
.section-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 22px;
  margin-bottom: 22px;
}

.eyebrow,
.kicker {
  margin: 0 0 8px;
  color: var(--red);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--serif);
  line-height: 1.12;
  letter-spacing: 0;
}

h1 {
  max-width: 760px;
  font-size: clamp(2.25rem, 5vw, 5.8rem);
}

h2 {
  font-size: clamp(1.45rem, 2.2vw, 2.5rem);
}

h3 {
  font-size: 1.25rem;
}

.source-stamp,
.pill-note {
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  padding: 12px 14px;
  box-shadow: var(--shadow);
}

.source-stamp span,
.source-stamp strong {
  display: block;
  white-space: nowrap;
}

.source-stamp span,
.pill-note {
  color: var(--muted);
  font-size: 0.86rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(420px, 0.85fr);
  gap: 18px;
  align-items: stretch;
}

.target-panel,
.countdown-panel,
.metric-card,
.coach-panel,
.workbench,
.timeline-panel,
.score-panel,
.phase-panel,
.week-plan-panel,
.topic-column,
.resource-panel,
.practice-stat,
.practice-panel,
.mock-form,
.mock-history-panel,
.mistake-form,
.review-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow);
}

.target-panel,
.countdown-panel,
.coach-panel,
.workbench,
.timeline-panel,
.score-panel,
.phase-panel,
.week-plan-panel,
.topic-column,
.resource-panel,
.practice-stat,
.practice-panel,
.mock-form,
.mock-history-panel,
.mistake-form,
.review-panel {
  padding: 22px;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.panel-head .kicker {
  margin: 0;
}

.target-title {
  display: flex;
  align-items: flex-end;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.code {
  display: inline-flex;
  align-items: center;
  height: 34px;
  border-left: 5px solid var(--green);
  padding-left: 10px;
  color: var(--green-dark);
  font-weight: 900;
}

.exam-facts {
  display: grid;
  gap: 13px;
  margin: 0;
}

.exam-facts div {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 16px;
  padding-top: 13px;
  border-top: 1px solid var(--line);
}

.exam-facts dt {
  color: var(--muted);
  font-size: 0.88rem;
}

.exam-facts dd {
  margin: 0;
  font-weight: 700;
}

.source-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.source-row a {
  border-bottom: 2px solid var(--gold);
  color: var(--ink);
  font-weight: 700;
}

.countdown-panel {
  position: relative;
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 18px;
  overflow: hidden;
  background:
    repeating-linear-gradient(135deg, rgba(8, 125, 131, 0.08) 0 8px, transparent 8px 18px),
    var(--paper);
}

.ring-wrap {
  position: relative;
  width: 160px;
  aspect-ratio: 1;
}

.progress-ring {
  width: 160px;
  height: 160px;
  transform: rotate(-90deg);
}

.ring-track,
.ring-value {
  fill: none;
  stroke-width: 13;
}

.ring-track {
  stroke: rgba(93, 105, 95, 0.18);
}

.ring-value {
  stroke: var(--green);
  stroke-linecap: round;
  stroke-dasharray: 427;
  stroke-dashoffset: 427;
  transition: stroke-dashoffset 400ms ease;
}

.ring-center {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  align-content: center;
}

.ring-center strong {
  font-family: var(--serif);
  font-size: 2.3rem;
  line-height: 1;
}

.ring-center span {
  color: var(--muted);
  font-weight: 700;
}

.countdown-copy {
  align-self: center;
}

.countdown-copy p {
  color: var(--muted);
  line-height: 1.7;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin: 18px 0;
}

.practice-dashboard {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.practice-stat {
  min-height: 126px;
  border-top: 6px solid var(--green);
}

.practice-stat:nth-child(2) {
  border-top-color: var(--cyan);
}

.practice-stat:nth-child(3) {
  border-top-color: var(--gold);
}

.practice-stat:nth-child(4) {
  border-top-color: var(--red);
}

.practice-stat span,
.practice-stat small {
  display: block;
  color: var(--muted);
}

.practice-stat strong {
  display: block;
  margin: 8px 0 4px;
  font-family: var(--serif);
  font-size: clamp(1.9rem, 3vw, 3rem);
  line-height: 1;
}

.metric-card {
  min-height: 132px;
  padding: 18px;
  border-top: 6px solid var(--green);
}

.metric-card:nth-child(2) {
  border-top-color: var(--cyan);
}

.metric-card:nth-child(3) {
  border-top-color: var(--gold);
}

.metric-card:nth-child(4) {
  border-top-color: var(--red);
}

.metric-card span,
.metric-card small {
  display: block;
  color: var(--muted);
}

.metric-card strong {
  display: block;
  margin: 8px 0 4px;
  font-family: var(--serif);
  font-size: clamp(2rem, 3vw, 3.2rem);
  line-height: 1;
}

.dashboard-columns,
.planner-layout,
.mock-layout,
.resource-layout,
.mistake-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.86fr);
  gap: 18px;
}

.practice-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(340px, 0.78fr);
  gap: 18px;
  align-items: start;
}

.practice-main {
  min-height: 520px;
}

.practice-side {
  display: grid;
  gap: 16px;
}

.practice-block {
  display: grid;
  gap: 10px;
}

.segmented-control {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.segmented-control.compact {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.segmented-control button {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-2);
  color: var(--muted);
  font-weight: 900;
}

.segmented-control button.active {
  border-color: var(--green-dark);
  background: var(--green-dark);
  color: #fff;
}

.practice-question-card {
  display: grid;
  gap: 16px;
}

.practice-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.practice-meta span,
.practice-source span,
.practice-history-item span {
  color: var(--muted);
}

.practice-meta span {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper-2);
  padding: 4px 10px;
  font-size: 0.84rem;
  font-weight: 900;
}

.practice-stem {
  margin: 0;
  border-left: 6px solid var(--green);
  background: var(--paper-2);
  padding: 18px 18px 18px 20px;
  font-family: var(--serif);
  font-size: clamp(1.18rem, 1.7vw, 1.62rem);
  font-weight: 800;
  line-height: 1.62;
}

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

.choice-option {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  min-height: 58px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-2);
  color: var(--ink);
  padding: 12px;
  text-align: left;
}

.choice-option span {
  display: grid;
  place-items: center;
  width: 36px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: rgba(31, 122, 74, 0.12);
  color: var(--green-dark);
  font-weight: 900;
}

.choice-option strong {
  line-height: 1.5;
}

.choice-option.selected {
  border-color: var(--cyan);
  box-shadow: inset 4px 0 0 var(--cyan);
}

.choice-option.correct {
  border-color: var(--green-dark);
  background: rgba(31, 122, 74, 0.12);
  box-shadow: inset 4px 0 0 var(--green-dark);
}

.choice-option.wrong {
  border-color: var(--red);
  background: rgba(197, 58, 46, 0.1);
  box-shadow: inset 4px 0 0 var(--red);
}

.practice-result {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  background: var(--paper-2);
}

.practice-result.correct {
  border-color: var(--green);
}

.practice-result.wrong {
  border-color: var(--red);
}

.practice-result strong,
.practice-result p,
.practice-source strong,
.practice-source span,
.practice-history-item strong,
.practice-history-item span {
  display: block;
}

.practice-result p {
  margin: 7px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.practice-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.practice-source-list,
.practice-history {
  display: grid;
  gap: 10px;
}

.practice-source,
.practice-history-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-2);
  padding: 12px;
}

.practice-source span,
.practice-history-item span {
  margin-top: 5px;
  line-height: 1.45;
}

.practice-history-item {
  border-left: 5px solid var(--green);
}

.practice-history-item.wrong {
  border-left-color: var(--red);
}

.resource-dashboard {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.resource-stat {
  min-height: 126px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  padding: 18px;
  box-shadow: var(--shadow);
  border-top: 6px solid var(--green);
}

.resource-stat:nth-child(2) {
  border-top-color: var(--cyan);
}

.resource-stat:nth-child(3) {
  border-top-color: var(--gold);
}

.resource-stat span,
.resource-stat small {
  display: block;
  color: var(--muted);
}

.resource-stat strong {
  display: block;
  margin: 8px 0 4px;
  font-family: var(--serif);
  font-size: clamp(1.9rem, 3vw, 3rem);
}

.resource-panel {
  margin-bottom: 18px;
}

.route-grid,
.source-list,
.local-resource-list {
  display: grid;
  gap: 12px;
}

.route-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.route-card,
.source-card,
.local-resource-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-2);
  padding: 15px;
}

.route-card strong,
.source-card strong,
.local-resource-card strong {
  display: block;
}

.route-card strong {
  font-family: var(--serif);
  font-size: 1.18rem;
}

.route-card p,
.source-card p,
.source-card small,
.local-resource-card dd {
  color: var(--muted);
  line-height: 1.65;
}

.route-links,
.source-card footer,
.resource-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.route-links a,
.source-card a,
.source-card footer span {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 9px;
  background: var(--paper);
  font-size: 0.84rem;
  font-weight: 800;
}

.source-card span,
.local-resource-head span {
  display: block;
  margin-bottom: 6px;
  color: var(--red);
  font-size: 0.82rem;
  font-weight: 900;
}

.source-card footer {
  justify-content: space-between;
}

.resource-filters {
  margin-bottom: 12px;
}

.resource-filters button {
  min-height: 34px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper-2);
  color: var(--muted);
  padding: 0 12px;
  font-weight: 900;
}

.resource-filters button.active {
  background: var(--green-dark);
  border-color: var(--green-dark);
  color: #fff;
}

.local-resource-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.local-resource-card dl {
  display: grid;
  gap: 10px;
  margin: 0;
}

.local-resource-card dl div {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 10px;
}

.local-resource-card dt {
  color: var(--muted);
}

.local-resource-card dd {
  margin: 0;
}

.local-resource-card code {
  display: block;
  margin-top: 12px;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--muted);
  padding: 10px;
  white-space: normal;
  word-break: break-all;
}

.coach-panel {
  margin-bottom: 18px;
}

.coach-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.coach-card {
  min-height: 154px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(31, 122, 74, 0.1), transparent 42%),
    var(--paper-2);
  padding: 16px;
}

.coach-card span,
.coach-card p {
  color: var(--muted);
}

.coach-card span {
  display: block;
  margin-bottom: 9px;
  font-size: 0.84rem;
  font-weight: 900;
}

.coach-card strong {
  display: block;
  font-family: var(--serif);
  font-size: 1.18rem;
}

.coach-card p {
  margin: 10px 0 0;
  line-height: 1.65;
}

.study-inputs {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.study-input {
  display: grid;
  gap: 8px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-2);
}

.study-input label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  color: var(--muted);
  font-weight: 700;
}

.study-input input {
  width: 100%;
  accent-color: var(--green);
}

.note-field,
.mistake-form label,
.settings-grid label {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
}

.note-field {
  margin-top: 16px;
}

input,
select,
textarea {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-2);
  color: var(--ink);
  padding: 11px 12px;
  outline: 0;
}

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

input:focus,
select:focus,
textarea:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(31, 122, 74, 0.16);
}

.solid-button,
.ghost-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  border-radius: var(--radius);
  padding: 0 14px;
  font-weight: 900;
  white-space: nowrap;
}

.solid-button {
  border: 1px solid var(--green-dark);
  background: var(--green-dark);
  color: #fff;
}

.ghost-button {
  border: 1px solid var(--line);
  background: var(--paper-2);
  color: var(--ink);
}

.solid-button:hover,
.ghost-button:hover {
  transform: translateY(-1px);
}

.recent-logs,
.mistake-list,
.mock-history {
  display: grid;
  gap: 10px;
}

.log-item,
.mistake-item,
.task-card,
.topic-item,
.phase-card,
.bar-row,
.mock-item,
.mock-total {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-2);
}

.log-item {
  padding: 13px;
}

.log-item strong,
.log-item span {
  display: block;
}

.log-item span {
  color: var(--muted);
  margin-top: 4px;
}

.score-bars {
  display: grid;
  gap: 12px;
}

.bar-row {
  padding: 14px;
}

.bar-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.bar-head strong {
  font-size: 1.06rem;
}

.bar-head span {
  color: var(--muted);
  font-weight: 800;
}

.bar-track {
  height: 12px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(93, 105, 95, 0.18);
}

.bar-value {
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: var(--green);
  transition: width 300ms ease;
}

.bar-row:nth-child(2) .bar-value {
  background: var(--cyan);
}

.bar-row:nth-child(3) .bar-value {
  background: var(--gold);
}

.bar-row:nth-child(4) .bar-value {
  background: var(--red);
}

.phase-rail {
  display: grid;
  gap: 12px;
}

.phase-card {
  position: relative;
  padding: 14px 14px 14px 42px;
}

.phase-card::before {
  content: "";
  position: absolute;
  top: 19px;
  left: 15px;
  width: 13px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--green);
}

.phase-card.current::before {
  background: var(--red);
  box-shadow: 0 0 0 6px rgba(197, 58, 46, 0.14);
}

.phase-card strong,
.phase-card span {
  display: block;
}

.phase-card span {
  color: var(--muted);
  margin-top: 6px;
  line-height: 1.6;
}

.week-plan-panel {
  margin-top: 18px;
}

.task-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 10px;
}

.task-card {
  min-height: 220px;
  padding: 14px;
}

.task-card header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}

.task-card header strong {
  font-family: var(--serif);
}

.task-card label {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 8px;
  align-items: start;
  margin: 10px 0;
  color: var(--muted);
  line-height: 1.45;
}

.task-card input {
  width: 18px;
  height: 18px;
  accent-color: var(--green);
}

.topics-board {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.topic-column h3 {
  margin-bottom: 14px;
}

.topic-list {
  display: grid;
  gap: 10px;
}

.mock-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  align-content: start;
}

.mock-form .wide {
  grid-column: 1 / -1;
}

.mock-score-grid {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.mock-form label {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
}

.mock-summary {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}

.mock-total {
  min-height: 112px;
  padding: 14px;
}

.mock-total span,
.mock-total small {
  display: block;
  color: var(--muted);
}

.mock-total strong {
  display: block;
  margin: 6px 0 2px;
  font-family: var(--serif);
  font-size: clamp(1.6rem, 2.2vw, 2.4rem);
}

.mock-item {
  padding: 14px;
}

.mock-item header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
}

.mock-item header strong,
.mock-item header span {
  display: block;
}

.mock-item header span,
.mock-item p {
  color: var(--muted);
}

.mock-score-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.mock-score-row span,
.mistake-meta span {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px 8px;
  background: var(--paper);
}

.topic-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 150px;
  gap: 12px;
  align-items: center;
  padding: 13px;
}

.topic-copy strong,
.topic-copy span {
  display: block;
}

.topic-copy span {
  margin-top: 5px;
  color: var(--muted);
  line-height: 1.5;
}

.mastery-control {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 5px;
}

.mastery-control button {
  height: 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--muted);
  font-weight: 900;
}

.mastery-control button.active {
  background: var(--green-dark);
  color: #fff;
  border-color: var(--green-dark);
}

.mistake-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  align-content: start;
}

.header-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
}

.mistake-form .wide {
  grid-column: 1 / -1;
}

.mistake-item {
  padding: 14px;
}

.mistake-item header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
}

.mistake-item h3 {
  font-family: var(--sans);
  font-size: 1rem;
}

.mistake-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 10px 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.mistake-item p {
  color: var(--muted);
  line-height: 1.6;
}

.review-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.review-actions button {
  min-height: 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
  font-weight: 800;
}

.empty-state {
  display: grid;
  place-items: center;
  min-height: 180px;
  padding: 26px;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  text-align: center;
}

.empty-state.compact {
  min-height: 116px;
}

.empty-state strong {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.3rem;
}

.toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 40;
  max-width: min(360px, calc(100vw - 32px));
  border: 1px solid var(--green-dark);
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--paper);
  padding: 13px 16px;
  font-weight: 900;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(14px);
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.settings-dialog {
  width: min(780px, calc(100vw - 28px));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
  box-shadow: var(--shadow);
}

.settings-dialog::backdrop {
  background: rgba(0, 0, 0, 0.48);
}

.dialog-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.dialog-head .icon-button {
  margin: 0;
  border-color: var(--line);
  color: var(--ink);
}

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

.subject-targets {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 0;
  margin: 20px 0 0;
}

@media (max-width: 1180px) {
  .hero-grid,
  .dashboard-columns,
  .planner-layout,
  .mock-layout,
  .resource-layout,
  .mistake-layout,
  .practice-layout,
  .topics-board {
    grid-template-columns: 1fr;
  }

  .metrics-grid,
  .practice-dashboard,
  .study-inputs,
  .coach-grid,
  .mock-summary,
  .resource-dashboard,
  .route-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .task-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 1320px) and (min-width: 1181px) {
  .study-inputs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .rail {
    z-index: 10;
    position: sticky;
    top: 0;
    flex-direction: row;
    justify-content: space-between;
    height: 68px;
    padding: 10px 14px;
  }

  .brand-mark {
    width: 42px;
  }

  .rail-nav {
    flex-direction: row;
    margin-top: 0;
    gap: 2px;
  }

  .nav-dot {
    width: 32px;
  }

  .icon-button {
    width: 38px;
    margin-top: 0;
  }

  main {
    padding: 18px 14px 28px;
  }

  .topbar,
  .section-head {
    display: grid;
  }

  .source-stamp,
  .pill-note {
    width: 100%;
  }

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

  .ring-wrap {
    margin-inline: auto;
  }

  .metrics-grid,
  .practice-dashboard,
  .study-inputs,
  .coach-grid,
  .resource-dashboard,
  .route-grid,
  .task-grid,
  .settings-grid,
  .subject-targets,
  .mock-form,
  .mock-score-grid,
  .mock-summary,
  .segmented-control,
  .segmented-control.compact,
  .mistake-form {
    grid-template-columns: 1fr;
  }

  .exam-facts div,
  .topic-item,
  .local-resource-card dl div {
    grid-template-columns: 1fr;
  }

  .local-resource-head,
  .source-card footer {
    display: grid;
  }

  .mastery-control {
    max-width: 260px;
  }
}