:root {
  color-scheme: light;
  --ink: #152033;
  --muted: #68778c;
  --line: #d8e1ea;
  --paper: #f4f7fa;
  --panel: #ffffff;
  --deep: #07131f;
  --teal: #128575;
  --teal-2: #41bda9;
  --gold: #dba852;
  --red: #b42318;
  --red-soft: #fff1ee;
  --green: #147a43;
  --green-soft: #e9f8ef;
  --blue-soft: #e8f2ff;
  --shadow: 0 22px 70px rgba(15, 31, 48, 0.14);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

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

button,
input,
select {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

.signal-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
}

.home-page {
  overflow-x: hidden;
  background: var(--deep);
}

.home-shell {
  position: relative;
  z-index: 1;
  width: min(1160px, calc(100% - 32px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 24px 0 42px;
  color: #f7fbff;
}

.home-nav,
.quiz-topbar {
  backdrop-filter: blur(18px);
}

.home-nav {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 850;
  letter-spacing: 0;
}

.brand-core {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border: 1px solid rgba(65, 189, 169, 0.55);
  border-radius: 8px;
  background: rgba(7, 19, 31, 0.68);
  color: var(--gold);
  box-shadow: 0 0 30px rgba(65, 189, 169, 0.22);
}

.brand-mark.compact {
  color: var(--ink);
}

.brand-mark.compact .brand-core {
  background: var(--deep);
}

.nav-link {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  padding: 0 14px;
  color: rgba(247, 251, 255, 0.88);
  font-weight: 750;
}

.quiz-topbar .nav-link {
  border-color: var(--line);
  color: var(--teal);
  background: #fff;
}

.hero-panel {
  min-height: calc(100vh - 220px);
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(320px, 0.72fr);
  gap: 34px;
  align-items: center;
  padding: 52px 0 24px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-copy h1 {
  margin: 0;
  max-width: 760px;
  font-size: clamp(48px, 8vw, 96px);
  line-height: 0.95;
  letter-spacing: 0;
}

.hero-lead {
  max-width: 680px;
  margin: 24px 0 0;
  color: rgba(247, 251, 255, 0.78);
  font-size: 18px;
  line-height: 1.75;
}

.hero-actions,
.stage-footer,
.topbar-actions,
.jump-group {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-actions {
  margin-top: 34px;
}

.primary-action,
.secondary-action,
.primary-button,
.ghost-button {
  min-height: 46px;
  border: 0;
  border-radius: 8px;
  padding: 0 18px;
  cursor: pointer;
  font-weight: 850;
}

.primary-action,
.primary-button {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  background: var(--gold);
  color: #211604;
  box-shadow: 0 16px 32px rgba(219, 168, 82, 0.26);
}

.secondary-action,
.ghost-button {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.08);
  color: #f7fbff;
}

.ghost-button {
  border-color: var(--line);
  background: #fff;
  color: var(--ink);
}

.action-icon {
  display: grid;
  width: 24px;
  height: 24px;
  place-items: center;
  border-radius: 50%;
  background: rgba(7, 19, 31, 0.14);
}

.mission-console {
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  padding: 18px;
  background: rgba(8, 25, 38, 0.68);
  box-shadow: var(--shadow);
}

.console-header {
  display: flex;
  gap: 8px;
  margin-bottom: 22px;
}

.console-header span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--teal-2);
}

.console-header span:nth-child(2) {
  background: var(--gold);
}

.console-header span:nth-child(3) {
  background: #e87965;
}

.pulse-ring {
  width: min(280px, 76vw);
  aspect-ratio: 1;
  margin: 0 auto 22px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(65, 189, 169, 0.38);
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(65, 189, 169, 0.2) 0 34%, transparent 35%),
    conic-gradient(from 80deg, rgba(219, 168, 82, 0.95), rgba(65, 189, 169, 0.7), rgba(219, 168, 82, 0.95));
  box-shadow: 0 0 42px rgba(65, 189, 169, 0.2);
}

.pulse-score {
  font-size: 62px;
  line-height: 1;
  font-weight: 900;
}

.pulse-label {
  margin-top: 76px;
  position: absolute;
  color: rgba(247, 251, 255, 0.7);
}

.console-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.console-grid div,
.route-card,
.control-panel,
.question-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.console-grid div {
  border-color: rgba(255, 255, 255, 0.13);
  background: rgba(255, 255, 255, 0.06);
  padding: 14px;
}

.console-grid strong,
.console-grid span,
.route-card span,
.route-card strong {
  display: block;
}

.console-grid strong {
  color: #fff;
}

.console-grid span {
  margin-top: 4px;
  color: rgba(247, 251, 255, 0.64);
  font-size: 13px;
}

.route-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  padding-bottom: 26px;
}

.route-card {
  min-height: 180px;
  padding: 22px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 16px 42px rgba(7, 19, 31, 0.18);
}

.route-kicker {
  color: var(--teal);
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

.route-card strong {
  margin-top: 18px;
  font-size: 24px;
}

.route-card span:last-child {
  margin-top: 10px;
  color: var(--muted);
  line-height: 1.65;
}

.quiz-topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(244, 247, 250, 0.9);
}

.topbar-inner {
  width: min(1240px, calc(100% - 32px));
  min-height: 70px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.practice-shell {
  width: min(1240px, calc(100% - 32px));
  margin: 0 auto;
  padding: 22px 0 42px;
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 18px;
}

.control-panel {
  align-self: start;
  position: sticky;
  top: 92px;
  padding: 18px;
  box-shadow: 0 10px 34px rgba(21, 32, 51, 0.06);
}

.panel-section + .panel-section {
  margin-top: 18px;
}

.section-label {
  display: block;
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 850;
}

.segmented {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 3px;
  background: #edf2f6;
}

.segment {
  min-height: 36px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-weight: 850;
}

.segment.active {
  background: #fff;
  color: var(--teal);
  box-shadow: 0 2px 10px rgba(21, 32, 51, 0.08);
}

.select,
.input,
.jump-input {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 12px;
  background: #fff;
  color: var(--ink);
  outline: none;
}

.select:focus,
.input:focus,
.jump-input:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(18, 133, 117, 0.13);
}

.switches {
  display: grid;
  gap: 10px;
}

.switch-row {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 750;
}

.switch-row input {
  width: 18px;
  height: 18px;
  accent-color: var(--teal);
}

.stats-grid {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.stats-grid div {
  min-height: 78px;
  border-radius: 8px;
  padding: 12px;
  background: #f5f8fb;
}

.stats-grid strong,
.stats-grid span {
  display: block;
}

.stats-grid strong {
  color: var(--teal);
  font-size: 26px;
  line-height: 1.1;
}

.stats-grid span {
  margin-top: 5px;
  color: var(--muted);
  font-size: 13px;
}

.question-stage {
  min-width: 0;
}

.stage-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: start;
  margin-bottom: 14px;
}

.stage-head h1 {
  margin: 0;
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.08;
  letter-spacing: 0;
}

.icon-button {
  width: 46px;
  height: 46px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--muted);
  cursor: pointer;
  font-size: 26px;
  line-height: 1;
}

.icon-button.active {
  border-color: var(--gold);
  background: #fff8e9;
  color: #9d6a11;
}

.progress-track {
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: #dbe4ec;
  margin-bottom: 16px;
}

.progress-track span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--teal), var(--gold));
  transition: width 0.25s ease;
}

.question-card {
  min-height: 430px;
  padding: 24px;
  box-shadow: var(--shadow);
}

.question-text {
  margin: 0;
  font-size: 22px;
  line-height: 1.68;
  font-weight: 760;
}

.options-grid {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.option-button {
  min-height: 58px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  background: #fff;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}

.option-button:hover {
  border-color: var(--teal);
  background: #f3fbf9;
}

.option-key {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 8px;
  background: #eef3f7;
  font-weight: 900;
}

.option-button.correct {
  border-color: var(--green);
  background: var(--green-soft);
}

.option-button.wrong {
  border-color: var(--red);
  background: var(--red-soft);
}

.option-button.correct .option-key {
  background: var(--green);
  color: #fff;
}

.option-button.wrong .option-key {
  background: var(--red);
  color: #fff;
}

.feedback-box {
  margin-top: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  background: #f7fafc;
}

.feedback-box strong,
.feedback-box span {
  display: block;
}

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

.feedback-box.good {
  border-color: #a6dfba;
  background: var(--green-soft);
}

.feedback-box.bad {
  border-color: #ffc7bd;
  background: var(--red-soft);
}

.feedback-box.good strong {
  color: var(--green);
}

.feedback-box.bad strong {
  color: var(--red);
}

.stage-footer {
  justify-content: space-between;
  margin-top: 16px;
}

.jump-input {
  width: 92px;
}

.empty-state {
  padding: 36px;
  border: 1px dashed var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--muted);
  text-align: center;
  line-height: 1.7;
}

@media (max-width: 900px) {
  .hero-panel,
  .route-band,
  .practice-shell {
    grid-template-columns: 1fr;
  }

  .hero-panel {
    padding-top: 30px;
  }

  .control-panel {
    position: static;
  }
}

@media (max-width: 620px) {
  .home-shell,
  .topbar-inner,
  .practice-shell {
    width: min(100% - 20px, 1240px);
  }

  .home-nav,
  .topbar-inner,
  .stage-footer {
    align-items: stretch;
    flex-direction: column;
  }

  .hero-copy h1 {
    font-size: 44px;
  }

  .question-card {
    padding: 18px;
  }

  .question-text {
    font-size: 19px;
  }

  .topbar-actions,
  .hero-actions,
  .jump-group {
    width: 100%;
  }

  .primary-action,
  .secondary-action,
  .ghost-button,
  .primary-button,
  .jump-group,
  .jump-input {
    width: 100%;
    justify-content: center;
  }
}