:root {
  color-scheme: light;
  --bg: #f6f7f4;
  --panel: #ffffff;
  --text: #1c2521;
  --muted: #65706b;
  --border: #d9dfda;
  --primary: #23644d;
  --primary-dark: #174735;
  --primary-soft: #e4f1ea;
  --blue: #245b83;
  --blue-soft: #e5eef5;
  --amber: #8a5a12;
  --amber-soft: #fff3d9;
  --danger: #8b2b2b;
  --danger-soft: #f8e6e6;
  --shadow: 0 18px 45px rgba(42, 52, 46, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(180deg, #eef3ed 0, rgba(238, 243, 237, 0) 320px),
    var(--bg);
  color: var(--text);
  font-family:
    "Microsoft YaHei",
    "PingFang SC",
    "Hiragino Sans GB",
    "Noto Sans CJK SC",
    Arial,
    sans-serif;
  line-height: 1.6;
}

button,
input {
  font: inherit;
}

a {
  color: var(--blue);
}

.topbar {
  border-bottom: 1px solid rgba(35, 100, 77, 0.14);
}

.topbar__inner {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--primary);
  font-size: 14px;
  font-weight: 700;
}

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

h1 {
  margin-bottom: 0;
  font-size: clamp(28px, 5vw, 42px);
  line-height: 1.15;
  letter-spacing: 0;
}

.mode-pill {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 4px 12px;
  border: 1px solid rgba(35, 100, 77, 0.28);
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 700;
}

.page-shell {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 36px;
}

.lead {
  max-width: 850px;
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 16px;
}

.tool-panel {
  min-height: 560px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.loading {
  padding: 36px;
  color: var(--muted);
}

.question-view,
.result-view {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.progress-area {
  padding: 22px 26px 18px;
  border-bottom: 1px solid var(--border);
  background: #fbfcfa;
}

.progress-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 14px;
}

.progress-bar {
  width: 100%;
  height: 8px;
  border-radius: 999px;
  background: #e6ebe7;
  overflow: hidden;
}

.progress-bar span {
  display: block;
  height: 100%;
  width: var(--progress, 12%);
  background: linear-gradient(90deg, var(--primary), var(--blue));
}

.question-body,
.result-body {
  padding: 28px 32px 32px;
}

.question-title {
  margin-bottom: 14px;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.3;
}

.hint {
  margin: 0 0 22px;
  padding: 14px 16px;
  border-left: 4px solid var(--blue);
  background: var(--blue-soft);
  color: #28475b;
  border-radius: 6px;
}

.option-list {
  display: grid;
  gap: 10px;
  margin: 0 0 24px;
}

.option-row {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  min-height: 52px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #ffffff;
  cursor: pointer;
}

.option-row:hover,
.option-row:has(input:focus-visible) {
  border-color: rgba(35, 100, 77, 0.55);
  background: #f8fbf9;
}

.option-row:has(input:checked) {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.option-row--disabled {
  cursor: not-allowed;
  opacity: 0.58;
}

.option-row input {
  width: 18px;
  height: 18px;
  margin: 3px 0 0;
  accent-color: var(--primary);
}

.option-label {
  display: block;
  font-weight: 700;
}

.option-note {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 14px;
}

.number-field {
  margin-bottom: 24px;
}

.number-label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.number-input-wrap {
  display: flex;
  align-items: stretch;
  max-width: 440px;
}

.number-input-wrap input {
  width: 100%;
  min-width: 0;
  height: 48px;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: 8px 0 0 8px;
  color: var(--text);
}

.number-input-wrap input:focus {
  outline: 3px solid rgba(36, 91, 131, 0.2);
  border-color: var(--blue);
}

.unit {
  display: inline-flex;
  align-items: center;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-left: 0;
  border-radius: 0 8px 8px 0;
  background: #f8faf8;
  color: var(--muted);
  font-weight: 700;
}

.validation {
  min-height: 22px;
  margin: -10px 0 16px;
  color: var(--danger);
  font-size: 14px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 8px 16px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: var(--primary);
  color: #ffffff;
  cursor: pointer;
  font-weight: 700;
}

.btn:hover {
  background: var(--primary-dark);
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.btn--secondary {
  border-color: var(--border);
  background: #ffffff;
  color: var(--text);
}

.btn--secondary:hover {
  background: #f3f6f3;
}

.btn--link {
  min-height: auto;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--blue);
}

.btn--link:hover {
  background: transparent;
  color: var(--primary);
  text-decoration: underline;
}

.result-hero {
  padding: 24px 32px;
  border-bottom: 1px solid var(--border);
  background: #fbfcfa;
}

.result-label {
  display: inline-flex;
  margin-bottom: 10px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 700;
}

.result-label--warn {
  background: var(--amber-soft);
  color: var(--amber);
}

.result-label--manual {
  background: var(--danger-soft);
  color: var(--danger);
}

.result-title {
  margin-bottom: 8px;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.25;
}

.result-summary {
  max-width: 840px;
  margin-bottom: 0;
  color: var(--muted);
}

.section-title {
  margin: 0 0 12px;
  font-size: 18px;
}

.result-section {
  margin-bottom: 26px;
}

.procedure-list {
  display: grid;
  gap: 12px;
}

.procedure-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: start;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}

.procedure-row:first-child {
  border-top: 1px solid var(--border);
}

.procedure-row h3 {
  margin: 0 0 4px;
  font-size: 17px;
}

.procedure-row p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
}

.procedure-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.mini-link {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #ffffff;
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
}

.note-list,
.trail-list {
  margin: 0;
  padding-left: 20px;
}

.note-list li,
.trail-list li {
  margin-bottom: 6px;
}

.empty-state {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fbfcfa;
  color: var(--muted);
}

.calc-preview {
  margin: 0 0 22px;
  padding: 16px;
  border: 1px solid rgba(35, 100, 77, 0.22);
  border-radius: 8px;
  background: var(--primary-soft);
}

.calc-preview h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.calc-preview p {
  margin-bottom: 4px;
  color: var(--muted);
}

.calc-preview__value {
  color: var(--primary-dark) !important;
  font-size: 28px;
  font-weight: 800;
  line-height: 1.2;
}

.calc-card {
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fbfcfa;
}

.calc-card__main {
  margin-bottom: 16px;
}

.calc-card__main span {
  display: block;
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.calc-card__main strong {
  display: block;
  margin-bottom: 6px;
  color: var(--primary-dark);
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.15;
}

.calc-card__main p {
  margin-bottom: 0;
  color: var(--muted);
}

.calc-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0 0 14px;
}

.calc-grid div {
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #ffffff;
}

.calc-grid dt {
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.calc-grid dd {
  margin: 0;
  color: var(--text);
  font-weight: 700;
}

.copy-status {
  color: var(--primary);
  font-size: 14px;
  font-weight: 700;
}

.footer {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
  padding: 0 0 28px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 720px) {
  .topbar__inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .question-body,
  .result-body,
  .result-hero,
  .progress-area {
    padding-left: 18px;
    padding-right: 18px;
  }

  .procedure-row {
    grid-template-columns: 1fr;
  }

  .procedure-links {
    justify-content: flex-start;
  }

  .actions {
    align-items: stretch;
    flex-direction: column;
  }

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

  .btn {
    width: 100%;
  }
}