:root {
  --bg: #e8e8e8;
  --surface: #ffffff;
  --ink: #111111;
  --muted: #555555;
  --line: #111111;
  --focus: #005fcc;
  --danger-border: #b00020;
  --radius: 4px;
  --font: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --pad-x: 0.65rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  height: 100%;
  height: 100dvh;
}

html,
body {
  margin: 0;
  overscroll-behavior: none;
}

body {
  height: 100%;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.35;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

.mode-switch {
  flex: 0 0 auto;
  width: min(720px, calc(100% - 1.3rem));
  margin: 0.35rem auto 0;
}

.mode-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.2rem;
  padding: 0.2rem;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: #e4e4e4;
}

.mode-tab {
  appearance: none;
  border: none;
  border-radius: calc(var(--radius) - 2px);
  background: transparent;
  color: #555;
  font: inherit;
  font-weight: 700;
  font-size: clamp(0.82rem, 2.8vw, 0.98rem);
  letter-spacing: 0.02em;
  min-height: 2.55rem;
  padding: 0.3rem 0.35rem;
  cursor: pointer;
  line-height: 1.15;
}

.mode-tab.is-active {
  color: #fff;
  background: #111;
}

.mode-tab:not(.is-active):hover,
.mode-tab:not(.is-active):focus-visible {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.65);
  outline: none;
}

.mode-tab:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 1px;
}

.screen-step {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 800;
  color: var(--muted);
}

.threshold-card {
  padding: 0.45rem 0.55rem;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: #fff8e1;
}

.threshold-title {
  margin: 0 0 0.2rem;
  font-size: 0.82rem;
  font-weight: 800;
}

.threshold-body {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 600;
  line-height: 1.35;
  color: #222;
}

.shell {
  flex: 1 1 auto;
  min-height: 0;
  width: min(720px, 100%);
  margin: 0 auto;
  padding: 0.45rem var(--pad-x) 0.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.brand {
  flex: 0 0 auto;
  width: min(720px, calc(100% - 1.3rem));
  margin: 0.4rem auto 0;
  padding: 0;
}

.brand h1 {
  margin: 0;
  font-size: clamp(1.25rem, 5vw, 1.55rem);
  font-weight: 800;
  letter-spacing: 0.04em;
  line-height: 1.15;
  text-align: center;
}

.step-lead {
  margin: 0;
  color: var(--ink);
  font-size: clamp(1rem, 3.6vw, 1.15rem);
  font-weight: 700;
}

.app {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.loading,
.error,
.note {
  padding: 0.55rem 0.65rem;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  font-size: 0.85rem;
}

.about-panel {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: 0.7rem;
  padding: 0.9rem 0.95rem;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: auto;
}

.about-brand {
  margin: 0;
  font-size: clamp(1.25rem, 4.5vw, 1.5rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 0.03em;
  color: var(--ink);
}

.about-lead {
  margin: 0;
  font-size: clamp(1.02rem, 3.4vw, 1.15rem);
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

.about-principle {
  margin: 0;
  padding-top: 0.15rem;
  border-top: 1px solid #d0d0d0;
  font-size: clamp(0.92rem, 3vw, 1.02rem);
  font-weight: 600;
  line-height: 1.45;
  color: #333;
}

.about-list {
  margin: 0;
  padding: 0.15rem 0 0;
  list-style: none;
  display: grid;
  gap: 0.45rem;
}

.about-go {
  appearance: none;
  margin: 0;
  width: 100%;
  display: grid;
  gap: 0.15rem;
  padding: 0.65rem 0.7rem;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: #f3f3f3;
  color: var(--ink);
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.about-go:hover,
.about-go:focus-visible {
  background: #111;
  color: #fff;
  outline: none;
}

.about-go strong {
  font-size: clamp(0.98rem, 3.2vw, 1.08rem);
  font-weight: 800;
  line-height: 1.3;
}

.about-go span {
  font-size: clamp(0.86rem, 2.8vw, 0.95rem);
  font-weight: 500;
  line-height: 1.4;
  color: var(--muted);
}

.about-go:hover span,
.about-go:focus-visible span {
  color: #cccccc;
}

.about-foot {
  margin: 0;
  font-size: clamp(0.86rem, 2.8vw, 0.95rem);
  font-weight: 500;
  line-height: 1.4;
  color: var(--muted);
}

.about-contact {
  margin: auto 0 0;
  padding-top: 0.55rem;
  border-top: 1px solid #d0d0d0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.55rem;
}

.about-contact .about-foot {
  flex: 1 1 auto;
  min-width: 0;
}

.about-social {
  flex: 0 0 auto;
  display: flex;
  gap: 0.35rem;
}

.social-btn {
  width: 2.35rem;
  height: 2.35rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: #111;
  color: #fff;
  text-decoration: none;
}

.social-btn:hover,
.social-btn:focus-visible {
  background: #fff;
  color: #111;
  outline: none;
}

.social-icon {
  width: 1.15rem;
  height: 1.15rem;
  display: block;
}

.error {
  border-color: var(--danger-border);
}

.note {
  color: var(--muted);
  font-weight: 500;
  flex: 0 0 auto;
}

.topic-btn,
.link-card,
.back-btn,
.retry-btn {
  appearance: none;
  border: 2px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  border-radius: var(--radius);
  text-align: left;
  cursor: pointer;
  text-decoration: none;
}

.topic-btn,
.retry-btn,
.back-btn {
  width: 100%;
  padding: 0.55rem 0.75rem;
  font: inherit;
}

.topic-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1 1 0;
  min-height: 0;
}

.topic-btn:hover,
.topic-btn:focus-visible,
.link-card:hover,
.link-card:focus-visible,
.back-btn:hover,
.back-btn:focus-visible,
.retry-btn:hover,
.retry-btn:focus-visible {
  background: #111111;
  color: #ffffff;
  outline: none;
}

.link-card:hover .go,
.link-card:focus-visible .go {
  color: #dddddd;
}

.topic-label {
  font-size: clamp(1.15rem, 4.5vw, 1.4rem);
  font-weight: 800;
  line-height: 1.15;
}

.city-regions {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  justify-content: space-evenly;
}

.region-row {
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: 0.45rem;
  align-items: center;
  min-height: 0;
}

.region-label {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--ink);
  line-height: 1.1;
}

.region-cities {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: stretch;
}

.city-chip {
  appearance: none;
  flex: 1 1 auto;
  min-width: 4.4rem;
  min-height: 2.85rem;
  padding: 0.55rem 0.7rem;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-size: 1.05rem;
  font-weight: 800;
  cursor: pointer;
  line-height: 1.15;
  text-align: center;
}

.city-chip:hover,
.city-chip:focus-visible {
  background: #111111;
  color: #ffffff;
  outline: none;
}

.link-list {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.link-card {
  flex: 1 1 0;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.65rem;
  padding: 0.55rem 0.8rem;
}

.link-card-text {
  flex: 1 1 auto;
  min-width: 0;
  display: grid;
  gap: 0.2rem;
}

.link-card strong {
  font-size: clamp(1.05rem, 1.1rem + 1.2vh, 1.4rem);
  margin: 0;
  line-height: 1.3;
  font-weight: 800;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.link-card .link-blurb {
  margin: 0;
  font-size: clamp(0.92rem, 0.95rem + 0.7vh, 1.15rem);
  font-weight: 600;
  line-height: 1.35;
  color: #444444;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.link-card:hover .link-blurb,
.link-card:focus-visible .link-blurb {
  color: #cccccc;
}

.link-card .tel-num {
  flex: 0 1 auto;
  max-width: 48%;
  margin: 0;
  text-align: right;
  font-size: clamp(1.1rem, 1.15rem + 1.2vh, 1.5rem);
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.2;
  color: #0b5cab;
  font-variant-numeric: tabular-nums;
}

.link-card.is-tel:hover .tel-num,
.link-card.is-tel:focus-visible .tel-num {
  color: #7ec8ff;
}

.link-card .go {
  flex: 0 0 auto;
  margin: 0;
  color: var(--ink);
  font-size: clamp(1rem, 1rem + 0.8vh, 1.25rem);
  font-weight: 800;
}

.actions {
  flex: 0 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.3rem;
  margin: 0;
}

.actions:has(.back-btn + .back-btn),
.actions.actions-inline,
.actions-inline {
  grid-template-columns: 1fr 1fr;
  gap: 0.35rem;
}

.actions-inline .screen-submit,
.actions.actions-inline .screen-submit {
  min-height: 2.35rem;
  margin-top: 0;
  width: 100%;
  font-size: 0.88rem;
  line-height: 1.2;
  padding: 0.35rem 0.35rem;
}

.actions-inline .back-btn,
.actions.actions-inline .back-btn {
  width: 100%;
  font-size: 0.88rem;
  line-height: 1.2;
  padding: 0.35rem 0.35rem;
}

.back-btn,
.retry-btn {
  text-align: center;
  font-weight: 800;
  font-size: 0.95rem;
  background: transparent;
  padding: 0.45rem 0.5rem;
  min-height: 2.35rem;
}

.site-foot {
  display: none;
}

body[data-mode="screen"] .shell {
  min-height: 0;
}

body[data-mode="screen"] .app {
  min-height: 0;
  overflow: hidden;
}

body[data-mode="screen"] .link-list {
  flex: 1 1 auto;
  min-height: 0;
  gap: 0.25rem;
}

body[data-mode="screen"] .link-card {
  flex: 1 1 0;
  min-height: 0;
  padding: 0.45rem 0.7rem;
}

.screen-form {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 0.55rem;
  border: 2px solid var(--line);
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
}

.screen-form.is-zones {
  gap: 0.3rem;
}

.screen-form .screen-submit {
  margin-top: auto;
}

.screen-form.is-zones .actions {
  margin-top: 0;
}

.zone-board {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.zone-board-title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 800;
}

.zone-picker {
  flex: 1 1 auto;
  min-height: 0;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.35rem;
  align-items: start;
}

.zone-scale-cap {
  font-size: 0.85rem;
  font-weight: 800;
  color: #111;
  line-height: 1;
  margin-top: 0.4rem;
}

.zone-picker-main {
  min-width: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  align-self: stretch;
}

.zone-scale-track {
  position: relative;
  flex: 0 0 auto;
  height: 1.7rem;
  min-width: 0;
}

.zone-scale-rail {
  position: absolute;
  left: 0;
  right: 0;
  top: 0.55rem;
  height: 2px;
  background: #111;
  border-radius: 1px;
}

.zone-scale-rail::before,
.zone-scale-rail::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 0;
  height: 0;
  transform: translateY(-50%);
}

.zone-scale-rail::before {
  left: 0;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  border-right: 8px solid #111;
}

.zone-scale-rail::after {
  right: 0;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  border-left: 8px solid #111;
}

.zone-scale-tick {
  position: absolute;
  top: 0.15rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.1rem;
  transform: translateX(-50%);
  pointer-events: none;
}

.zone-scale-tick i {
  display: block;
  width: 2px;
  height: 0.85rem;
  background: #111;
  border-radius: 1px;
}

.zone-scale-tick em {
  font-style: normal;
  font-size: 0.72rem;
  font-weight: 800;
  line-height: 1;
  color: #111;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.zone-levels {
  flex: 1 1 auto;
  min-width: 0;
  min-height: 0;
  display: flex;
  flex-direction: row;
  align-items: stretch;
  gap: 0.28rem;
}

.zone-block {
  appearance: none;
  flex: 1 1 0;
  min-width: 0;
  min-height: 4.2rem;
  display: grid;
  place-content: center;
  place-items: center;
  padding: 0.45rem 0.35rem;
  border: 2px dashed #666;
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
  font: inherit;
  text-align: center;
  cursor: pointer;
}

.zone-block.is-ok {
  background: #e8f6eb;
}

.zone-block.is-mid {
  background: #fff6d6;
}

.zone-block.is-over {
  background: #f8e6e4;
}

.zone-block.is-on {
  border-style: solid;
  border-color: #111;
  box-shadow: none;
  outline: none;
}

.zone-label {
  font-size: clamp(0.95rem, 3.4vw, 1.2rem);
  font-weight: 800;
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
  word-break: break-word;
}

.zone-rule {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0.9rem;
  padding: 0;
  border: 0;
  background: transparent;
}

.zone-rule span {
  writing-mode: vertical-rl;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: #111;
  line-height: 1.1;
}

.zone-unsure {
  appearance: none;
  flex: 0 0 auto;
  width: 100%;
  min-height: 2.55rem;
  margin: 0;
  padding: 0.4rem 0.65rem;
  border: 2px dashed #666;
  border-radius: var(--radius);
  background: #f3f3f3;
  color: #333;
  font: inherit;
  font-size: 1.1rem;
  font-weight: 800;
  text-align: center;
  cursor: pointer;
  box-sizing: border-box;
}

.zone-unsure.is-on {
  border-style: solid;
  border-color: #111;
  background: #fff;
  color: #111;
  box-shadow: none;
}

.screen-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem;
  align-items: end;
}

.field {
  display: grid;
  gap: 0.15rem;
  font-size: 0.9rem;
  font-weight: 700;
}

.field-inline {
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 0.55rem 0.65rem;
}

.field-inline span {
  min-width: 0;
  line-height: 1.25;
}

.field-inline input[type="number"] {
  width: 7.75rem;
  min-width: 7.75rem;
  height: 2.35rem;
  box-sizing: border-box;
  text-align: right;
}

.field-inline select {
  width: min(11rem, 42vw);
  min-width: 8.5rem;
  height: 2.35rem;
  box-sizing: border-box;
}

.field span {
  color: var(--ink);
  line-height: 1.2;
}

.field input,
.field select {
  width: 100%;
  min-height: 2.35rem;
  padding: 0.3rem 0.5rem;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-weight: 600;
  font-size: 0.95rem;
}

.field-set {
  margin: 0;
  padding: 0.35rem 0.45rem 0.4rem;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.65rem;
}

.field-set-stack {
  flex-direction: column;
  align-items: flex-start;
  gap: 0.35rem;
}

.field-set-stack .radio {
  white-space: normal;
  line-height: 1.3;
}

.field-set legend {
  padding: 0 0.2rem;
  font-size: 0.9rem;
  font-weight: 800;
}

.radio {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.92rem;
  font-weight: 600;
  white-space: nowrap;
}

.screen-submit {
  appearance: none;
  min-height: 2.6rem;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: #111;
  color: #fff;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.screen-submit:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.screen-result {
  flex: 1 1 auto;
  min-height: 0;
  padding: 0.55rem;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  overflow: hidden;
}

.screen-result.is-yes {
  border-color: #0a7a32;
}

.screen-result.is-mid {
  border-color: #a15c00;
}

.screen-result.is-no,
.screen-result.is-warn {
  border-color: #8a1f12;
}

.screen-result-title {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 800;
  line-height: 1.25;
}

.screen-story {
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.screen-story p {
  margin: 0;
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.45;
  color: var(--ink);
}

.screen-facts {
  margin: 0;
  padding-left: 1rem;
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.4;
}

.screen-facts strong {
  color: var(--ink);
}

.screen-result .actions {
  margin-top: auto;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}