/* Trades Buddy — "Blueprint" theme
   Deep blueprint navy + brass/measuring-tape amber. Sturdy, high-contrast,
   built to be read on a phone in direct sunlight on a job site. */

:root {
  --color-bg: #F3F1EA;
  --color-surface: #FFFFFF;
  --color-navy: #163A52;
  --color-navy-dark: #0E293C;
  --color-navy-tint: #E7EDF1;
  --color-ink: #1B2A34;
  --color-muted: #5B6B77;
  --color-amber: #E0A123;
  --color-amber-dark: #B87F13;
  --color-amber-ink: #5C3E00;
  --color-border: #E1DED3;
  --color-danger-bg: #FBF0E4;
  --color-danger-ink: #8A4B0B;

  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --shadow-card: 0 1px 2px rgba(14, 41, 60, 0.06), 0 4px 14px rgba(14, 41, 60, 0.08);
  --shadow-card-hover: 0 2px 4px rgba(14, 41, 60, 0.08), 0 10px 24px rgba(14, 41, 60, 0.14);
  --max-width: 960px;

  font-size: 16px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.4;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---------- Header ---------- */

.site-header {
  background: var(--color-navy);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 20px;
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: 0 2px 10px rgba(14, 41, 60, 0.25);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  text-decoration: none;
}

.brand-mark {
  width: 28px;
  height: 28px;
  color: var(--color-amber);
  flex-shrink: 0;
}
.brand-mark svg { width: 100%; height: 100%; display: block; }

.brand-name {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.01em;
}

.header-actions {
  display: flex;
  align-items: center;
}

.back-link {
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 8px 12px;
  margin: -8px -12px;
  border-radius: var(--radius-sm);
  opacity: 0.92;
  white-space: nowrap;
}
.back-link:hover, .back-link:focus-visible {
  background: rgba(255, 255, 255, 0.12);
  opacity: 1;
}

/* ---------- Main / layout ---------- */

main#app {
  flex: 1;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 28px 20px 48px;
}

.site-footer {
  text-align: center;
  color: var(--color-muted);
  font-size: 0.8rem;
  padding: 18px 20px 28px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.site-footer p {
  margin: 0 0 6px;
}
.site-footer p:last-child {
  margin-bottom: 0;
}

.footer-link {
  color: var(--color-navy);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 2px;
}
.footer-link:hover, .footer-link:focus-visible {
  color: var(--color-amber-dark);
}

/* ---------- Landing page ---------- */

.landing-title {
  font-size: 1.6rem;
  font-weight: 800;
  margin: 4px 0 4px;
  color: var(--color-navy-dark);
}

.landing-sub {
  color: var(--color-muted);
  margin: 0 0 24px;
  font-size: 1rem;
}

.trade-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(126px, 1fr));
  gap: 18px 14px;
}

.trade-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  background: none;
  border: none;
  padding: 6px 4px 2px;
  cursor: pointer;
  font-family: inherit;
  color: var(--color-ink);
  -webkit-tap-highlight-color: transparent;
}

.trade-btn-icon {
  width: 84px;
  height: 84px;
  border-radius: 50%;
  background: var(--color-navy);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-card);
  border: 3px solid transparent;
  transition: transform 0.12s ease, box-shadow 0.12s ease, border-color 0.12s ease, background 0.12s ease;
}
.trade-btn-icon svg { width: 42px; height: 42px; }

.trade-btn-label {
  font-weight: 700;
  font-size: 0.88rem;
  text-align: center;
  line-height: 1.2;
}

.trade-btn:hover .trade-btn-icon,
.trade-btn:focus-visible .trade-btn-icon {
  background: var(--color-navy-dark);
  border-color: var(--color-amber);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.trade-btn:active .trade-btn-icon {
  transform: translateY(0);
  border-color: var(--color-amber-dark);
}

.trade-btn:focus-visible {
  outline: none;
}
.trade-btn:focus-visible .trade-btn-icon {
  outline: 3px solid var(--color-amber);
  outline-offset: 3px;
}

/* ---------- Trade tools page ---------- */

.trade-page-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 6px;
}

.trade-page-icon {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--color-navy);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.trade-page-icon svg { width: 28px; height: 28px; }

.trade-page-title {
  font-size: 1.4rem;
  font-weight: 800;
  margin: 0;
  color: var(--color-navy-dark);
}

.trade-note {
  background: var(--color-danger-bg);
  color: var(--color-danger-ink);
  border: 1px solid #F0D9B8;
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.86rem;
  font-weight: 600;
  margin: 16px 0 4px;
}

.tool-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 20px;
}

.tool-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  box-shadow: var(--shadow-card);
  transition: transform 0.12s ease, box-shadow 0.12s ease, border-color 0.12s ease;
  -webkit-tap-highlight-color: transparent;
}

.tool-btn-label {
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--color-ink);
}

.tool-btn-arrow {
  color: var(--color-amber-dark);
  font-size: 1.2rem;
  font-weight: 700;
  flex-shrink: 0;
}

.tool-btn:hover, .tool-btn:focus-visible {
  border-color: var(--color-amber);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-1px);
  outline: none;
}

.tool-btn:active {
  transform: translateY(0);
}

/* ---------- Calculator / tool page ---------- */

.tool-page-title {
  font-size: 1.4rem;
  font-weight: 800;
  margin: 4px 0 0;
  color: var(--color-navy-dark);
}

.tool-note {
  background: var(--color-danger-bg);
  color: var(--color-danger-ink);
  border: 1px solid #F0D9B8;
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.86rem;
  font-weight: 600;
  margin: 14px 0 4px;
}

.calculator-shell {
  margin-top: 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: var(--shadow-card);
}

.coming-soon {
  text-align: center;
  padding: 40px 10px;
  color: var(--color-muted);
  font-weight: 600;
}

/* ---------- Prose (About / Disclaimer page) ---------- */

.prose {
  max-width: 640px;
}

.prose p {
  color: var(--color-ink);
  line-height: 1.6;
  margin: 0 0 16px;
}

.prose h2 {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--color-navy-dark);
  margin: 28px 0 10px;
}

.prose ul {
  margin: 0 0 16px;
  padding-left: 22px;
}

.prose li {
  color: var(--color-ink);
  line-height: 1.6;
  margin-bottom: 6px;
}

/* ---------- Shared calculator building blocks (used by future calculators) ---------- */

.field-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.field-row label {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--color-navy-dark);
}

.field-input-group {
  display: flex;
  gap: 8px;
}
.field-input-group input {
  flex: 1;
  width: auto;
  min-width: 0;
}

.field-input-group input,
.field-input-group select,
input[type="number"],
input[type="text"],
select {
  font-family: inherit;
  font-size: 1rem;
  padding: 11px 12px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--color-border);
  background: #fff;
  color: var(--color-ink);
  width: 100%;
}

input:focus, select:focus {
  outline: none;
  border-color: var(--color-amber);
  box-shadow: 0 0 0 3px rgba(224, 161, 35, 0.25);
}

.unit-toggle {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.unit-toggle button {
  font-family: inherit;
  font-weight: 700;
  font-size: 0.85rem;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1.5px solid var(--color-border);
  background: #fff;
  color: var(--color-muted);
  cursor: pointer;
}

.unit-toggle button.active {
  background: var(--color-navy);
  border-color: var(--color-navy);
  color: #fff;
}

.calc-btn {
  font-family: inherit;
  font-weight: 800;
  font-size: 1rem;
  padding: 13px 20px;
  border-radius: var(--radius-md);
  border: none;
  background: var(--color-amber);
  color: var(--color-amber-ink);
  cursor: pointer;
  width: 100%;
  margin-top: 4px;
}
.calc-btn:hover, .calc-btn:focus-visible { background: var(--color-amber-dark); color: #fff; }

.result-display {
  margin-top: 20px;
  background: var(--color-navy-tint);
  border-radius: var(--radius-md);
  padding: 18px 20px;
}

.result-display .result-row {
  margin-top: 16px;
}
.result-display .result-row:first-child {
  margin-top: 0;
}

.result-display .result-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.result-display .result-value {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--color-navy-dark);
  margin-top: 2px;
}

.result-display .result-value.secondary {
  font-size: 1.1rem;
  font-weight: 700;
}

.result-display .unit-toggle {
  margin-bottom: 14px;
}
.result-display .unit-toggle button {
  padding: 6px 12px;
  font-size: 0.78rem;
  background: #fff;
}
.result-display .unit-toggle button.active {
  background: var(--color-navy);
  border-color: var(--color-navy);
}

.field-suffix {
  display: flex;
  align-items: center;
  padding: 0 12px;
  color: var(--color-muted);
  font-weight: 700;
  font-size: 0.85rem;
  white-space: nowrap;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-navy-tint);
}

.field-hint {
  margin: -8px 0 4px;
  font-size: 0.78rem;
  color: var(--color-muted);
}

/* ---------- Responsive ---------- */

@media (min-width: 560px) {
  main#app { padding: 36px 28px 56px; }
  .landing-title { font-size: 1.9rem; }
  .trade-btn-icon { width: 96px; height: 96px; }
  .trade-btn-icon svg { width: 46px; height: 46px; }
}

@media (min-width: 720px) {
  .trade-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 24px 18px; }
}