:root {
  --bg: #0b0d12;
  --panel: #141821;
  --panel-soft: #191f2a;
  --line: rgba(255, 255, 255, 0.1);
  --text: #f6f7fb;
  --muted: #9da6b7;
  --accent: #b8f23c;
  --accent-strong: #d9ff5c;
  --blue: #4fa3ff;
  --safe: #32d583;
  --danger: #ff5964;
  --warn: #f5b849;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.34);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  letter-spacing: 0;
  background:
    linear-gradient(180deg, rgba(79, 163, 255, 0.08), transparent 360px),
    linear-gradient(135deg, rgba(184, 242, 60, 0.07), transparent 320px),
    var(--bg);
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

.shell {
  width: min(1180px, calc(100% - 28px));
  margin: 0 auto;
  padding: 22px 0 48px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.topbar h1 {
  margin: 0;
  font-size: clamp(24px, 3vw, 42px);
  line-height: 1.05;
}

.topbar p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14px;
  text-transform: uppercase;
}

.status-pill {
  flex: 0 0 auto;
  border: 1px solid rgba(184, 242, 60, 0.45);
  color: var(--accent-strong);
  border-radius: 999px;
  padding: 8px 12px;
  font-size: 13px;
  background: rgba(184, 242, 60, 0.08);
}

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

.tab-btn,
.primary-btn,
.secondary-btn,
.ghost-btn {
  min-height: 44px;
  border-radius: 8px;
  border: 1px solid var(--line);
  color: var(--text);
  background: var(--panel);
  transition: border-color 0.16s ease, background 0.16s ease, transform 0.16s ease;
}

.tab-btn:hover,
.primary-btn:hover,
.secondary-btn:hover,
.ghost-btn:hover {
  transform: translateY(-1px);
}

.tab-btn.active {
  color: #0b0d12;
  border-color: var(--accent);
  background: var(--accent);
  font-weight: 800;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.matrix,
.result-area {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(20, 24, 33, 0.9);
  box-shadow: var(--shadow);
}

.matrix {
  padding: 18px;
  margin-bottom: 14px;
}

.rear-matrix {
  border-color: rgba(79, 163, 255, 0.35);
}

.matrix-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.matrix-head h2 {
  margin: 0;
  font-size: 20px;
}

.matrix-head p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.dual-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.data-block,
.tire-grid {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-soft);
  padding: 14px;
}

.data-block.original {
  border-color: rgba(255, 255, 255, 0.16);
}

.data-block.modified {
  border-color: rgba(184, 242, 60, 0.28);
}

.data-block h3,
.tire-grid h3 {
  margin: 0 0 12px;
  font-size: 15px;
  color: var(--accent-strong);
}

.tire-grid {
  margin-top: 14px;
}

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

.compact-grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.field-row {
  display: grid;
  gap: 6px;
}

.field-row label {
  color: var(--muted);
  font-size: 13px;
}

.field-row input,
.field-row select {
  width: 100%;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  background: #0e1219;
  padding: 0 11px;
  outline: none;
}

.field-row input:focus,
.field-row select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(184, 242, 60, 0.11);
}

.settings-row {
  display: flex;
  align-items: end;
  flex-wrap: wrap;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(25, 31, 42, 0.75);
  padding: 14px;
  margin-bottom: 14px;
}

.inline-field {
  grid-template-columns: auto minmax(96px, 130px) auto;
  align-items: center;
  gap: 8px;
}

.inline-field label {
  color: var(--text);
}

.inline-field input {
  height: 40px;
}

.inline-field span {
  color: var(--muted);
  font-size: 13px;
}

.actions,
.export-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin: 14px 0;
}

.export-preview {
  border: 1px solid rgba(79, 163, 255, 0.28);
  border-radius: 8px;
  background: rgba(79, 163, 255, 0.08);
  padding: 12px;
  margin-top: 10px;
}

.export-preview a {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  border-radius: 8px;
  border: 1px solid var(--accent);
  color: #0b0d12;
  background: var(--accent);
  font-weight: 800;
  text-decoration: none;
  padding: 0 14px;
}

.export-preview img {
  display: block;
  width: min(100%, 520px);
  max-height: 320px;
  object-fit: contain;
  border-radius: 8px;
  margin-top: 10px;
  background: #f7f8fb;
}

.primary-btn {
  min-width: 148px;
  border-color: var(--accent);
  background: var(--accent);
  color: #0b0d12;
  font-weight: 800;
}

.secondary-btn {
  min-width: 118px;
  background: #111620;
}

.ghost-btn {
  min-width: 122px;
  color: var(--accent-strong);
  background: rgba(184, 242, 60, 0.06);
  border-color: rgba(184, 242, 60, 0.3);
}

.result-area {
  padding: 16px;
  margin-top: 16px;
}

.load-card,
.summary-card,
.axle-report,
.convert-result {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #10141d;
  margin-bottom: 14px;
  overflow: hidden;
}

.load-card {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: center;
  padding: 14px;
  border-color: rgba(184, 242, 60, 0.32);
}

.load-card strong {
  color: var(--accent-strong);
  font-size: 22px;
}

.axle-title {
  padding: 12px 14px;
  color: var(--text);
  font-weight: 800;
  background: #090c11;
  border-bottom: 1px solid var(--line);
}

.report-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  padding: 14px;
}

.metric-card,
.recommend-card,
.summary-section,
.tire-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.03);
  padding: 13px;
}

.metric-card h4,
.recommend-card h4,
.summary-section h4,
.tire-card h4 {
  margin: 0 0 10px;
  font-size: 14px;
  color: var(--muted);
}

.metric-card .big,
.recommend-card .big {
  display: block;
  color: var(--text);
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 6px;
}

.metric-card.modified .big,
.recommend-card .accent {
  color: var(--accent-strong);
}

.kv {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  padding: 8px 0;
  border-top: 1px dashed rgba(255, 255, 255, 0.09);
  font-size: 14px;
}

.kv:first-of-type {
  border-top: 0;
}

.kv span:first-child {
  color: var(--muted);
}

.tone-safe {
  color: var(--safe);
}

.tone-danger {
  color: var(--danger);
}

.tone-warn {
  color: var(--warn);
}

.tone-accent {
  color: var(--accent-strong);
}

.recommend-wrap {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  padding: 0 14px 14px;
}

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

.summary-card {
  padding: 16px;
  background: #f7f8fb;
  color: #171b24;
}

.summary-card h3 {
  margin: 0 0 14px;
  color: #10141d;
  font-size: 22px;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.summary-section {
  background: #ffffff;
  border-color: #e5e7eb;
}

.summary-section h4 {
  color: #111827;
}

.summary-section .kv {
  border-color: #edf0f4;
}

.summary-note {
  margin-top: 12px;
  border-left: 4px solid #4fa3ff;
  background: #eef6ff;
  color: #223047;
  border-radius: 8px;
  padding: 12px;
  font-size: 14px;
  line-height: 1.65;
}

.compact-result {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  min-height: 110px;
}

.compact-result strong {
  color: var(--accent-strong);
  font-size: 46px;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  z-index: 10;
  max-width: min(480px, calc(100% - 24px));
  border: 1px solid rgba(184, 242, 60, 0.38);
  border-radius: 8px;
  background: #111620;
  color: var(--text);
  box-shadow: var(--shadow);
  padding: 12px 14px;
}

@media (max-width: 820px) {
  .shell {
    width: min(100% - 18px, 1180px);
    padding-top: 14px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .tabs,
  .dual-grid,
  .report-grid,
  .recommend-wrap,
  .split-report,
  .summary-grid,
  .compact-grid,
  .compact-grid.three {
    grid-template-columns: 1fr;
  }

  .matrix {
    padding: 12px;
  }

  .settings-row,
  .actions,
  .export-actions,
  .load-card {
    align-items: stretch;
    flex-direction: column;
  }

  .inline-field {
    grid-template-columns: 1fr 110px auto;
  }

  .primary-btn,
  .secondary-btn,
  .ghost-btn {
    width: 100%;
  }

  .compact-result {
    flex-direction: column;
    text-align: center;
  }
}