/* =========================================================
   forza.tools — carbon setup sheet
   ========================================================= */

:root {
  color-scheme: only dark;

  /* paper */
  --paper:        oklch(0.19 0.008 60);
  --paper-2:      oklch(0.22 0.008 60);
  --paper-edge:   oklch(0.28 0.01 60);

  /* ink */
  --ink:          oklch(0.97 0.012 85);
  --ink-2:        oklch(0.88 0.014 85);
  --ink-mute:     oklch(0.72 0.018 85);
  --ink-faint:    oklch(0.50 0.018 85);

  /* lines */
  --hairline:     oklch(0.38 0.012 70);
  --hairline-2:   oklch(0.30 0.01 70);

  /* accent */
  --accent:       oklch(0.80 0.14 70);    /* amber */
  --accent-soft:  oklch(0.34 0.06 70);
  --accent-ink:   oklch(0.86 0.14 70);

  --warn:         oklch(0.72 0.18 35);

  /* grid texture */
  --grid-color:   oklch(0.85 0.02 80 / 0.06);
  --grid-size:    24px;

  /* surfaces */
  --card-bg:      oklch(0.21 0.008 60);
  --field-bg:     oklch(0.17 0.008 60);
  --hero-bg:      oklch(0.21 0.008 60);
}

*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { min-height: 100%; }

body {
  font-family: 'Space Grotesk', 'Inter Tight', system-ui, sans-serif;
  font-feature-settings: 'ss01', 'cv11';
  background-color: var(--paper);
  color: var(--ink);
  line-height: 1.45;
  font-size: 15px;
  background-image:
    radial-gradient(var(--grid-color) 1px, transparent 1.2px);
  background-size: var(--grid-size) var(--grid-size);
  background-position: -1px -1px;
}

::selection { background: var(--accent-soft); color: var(--accent-ink); }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

button { font-family: inherit; }

/* ---------- header ---------- */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 12px 24px;
  border-bottom: 1px solid var(--hairline);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 12px;
  letter-spacing: -0.01em;
}
.brand-mark {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.brand-mark span { color: var(--accent); }
.brand-tag {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  padding-left: 12px;
  border-left: 1px solid var(--hairline);
  white-space: nowrap;
}

.header-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.header-meta .dot {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
  margin-right: 6px;
  vertical-align: middle;
  box-shadow: 0 0 8px var(--accent);
}

.header-actions { display: flex; gap: 6px; }

.btn {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--hairline);
  border-radius: 2px;
  padding: 6px 12px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 500;
  cursor: pointer;
  transition: border-color .15s, color .15s, background .15s;
}
.btn:hover { border-color: var(--ink-2); color: var(--ink); }
.btn-accent { border-color: var(--accent); color: var(--accent); }
.btn-accent:hover { background: var(--accent); color: var(--paper); }

/* ---------- inputs panel ---------- */
.inputs {
  padding: 14px 14px 16px;
  max-width: 1452px;
  margin: 0 auto;
  border-bottom: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.input-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 26px;
  padding: 4px 0;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
  position: relative;
}
.field::before {
  content: '';
  position: absolute;
  inset: -8px -10px;
  border: 1px dashed var(--hairline-2);
  border-radius: 3px;
  pointer-events: none;
  transition: border-color .15s;
}
.field:focus-within::before { border-color: var(--ink-faint); }
.field--wide { grid-column: span 2; }

.field label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-mute);
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  min-height: 14px;
}
.field label .auto-badge {
  background: var(--hairline-2);
  color: var(--ink-mute);
  font-size: 8px;
  letter-spacing: 0.14em;
  padding: 1px 5px;
  border-radius: 1px;
}
.field label .reset-link {
  color: var(--accent);
  font-size: 9px;
  cursor: pointer;
  margin-left: auto;
  display: none;
  letter-spacing: 0.10em;
}
.field label .reset-link:hover { text-decoration: underline; }

.field input[type="number"],
.field select {
  background: var(--field-bg);
  color: var(--ink);
  border: 1px solid var(--hairline);
  border-radius: 2px;
  padding: 6px 10px;
  font-size: 14px;
  font-family: 'JetBrains Mono', monospace;
  font-variant-numeric: tabular-nums;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
  width: 100%;
  min-width: 0;
}
.field select {
  appearance: none;
  -webkit-appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--ink-mute) 50%),
                    linear-gradient(135deg, var(--ink-mute) 50%, transparent 50%);
  background-position: calc(100% - 14px) 50%, calc(100% - 10px) 50%;
  background-size: 4px 4px;
  background-repeat: no-repeat;
  padding-right: 26px;
  cursor: pointer;
}
.field input:focus,
.field select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.field select:disabled { opacity: .4; cursor: not-allowed; }

.field input.warn { border-color: var(--warn); }
.field .hint {
  color: var(--warn);
  font-size: 10px;
  font-family: 'JetBrains Mono', monospace;
  display: none;
}
.field input.warn ~ .hint { display: block; }

/* segmented control */
.seg {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  border: 1px solid var(--hairline);
  border-radius: 2px;
  overflow: hidden;
  background: var(--field-bg);
}
.seg button {
  background: transparent;
  color: var(--ink-mute);
  border: none;
  border-right: 1px solid var(--hairline-2);
  padding: 6px 4px;
  font-size: 11px;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color .12s, background .12s;
  min-width: 0;
}
.seg button:last-child { border-right: none; }
.seg button:hover:not(.active) { color: var(--ink); }
.seg button.active {
  background: var(--ink);
  color: var(--paper);
  font-weight: 600;
}

/* range pair */
.range-pair { display: flex; align-items: center; gap: 6px; }
.range-pair input[type="number"] { padding-left: 8px; padding-right: 6px; }
.range-pair .sep { color: var(--ink-faint); font-family: 'JetBrains Mono', monospace; font-size: 11px; }

/* ---------- summary strip ---------- */
.summary {
  padding: 12px 24px;
  max-width: 1452px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  border-bottom: 1px solid var(--hairline);
  background: var(--hero-bg);
  position: relative;
}
.summary::before {
  content: '';
  position: absolute;
  inset: 5px;
  border: 1px dashed var(--hairline);
  pointer-events: none;
  opacity: .35;
}

.summary-spec {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  align-items: baseline;
}
.spec {
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.spec-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px;
  letter-spacing: 0.18em;
  color: var(--ink-faint);
  text-transform: uppercase;
}
.spec-value {
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.01em;
  font-family: 'JetBrains Mono', monospace;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}
.spec-value .unit { font-size: 11px; color: var(--ink-mute); margin-left: 4px; letter-spacing: 0.12em; }

.summary-goal {
  text-align: right;
  display: flex;
  flex-direction: column;
  gap: 1px;
  align-items: flex-end;
}
.summary-goal .goal-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px;
  letter-spacing: 0.18em;
  color: var(--ink-faint);
  text-transform: uppercase;
}
.summary-goal .goal-value {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
}

/* ---------- tune sheet ---------- */
.sheet {
  padding: 20px 24px 60px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 14px;
  max-width: 1500px;
  margin: 0 auto;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--hairline);
  border-radius: 3px;
  padding: 12px 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
  transition: border-color .2s;
}
.card::before {
  content: '';
  position: absolute;
  top: -1px; left: -1px;
  width: 12px; height: 12px;
  border-top: 1.5px solid var(--accent);
  border-left: 1.5px solid var(--accent);
  pointer-events: none;
}
.card.locked { opacity: .5; }
.card.locked::before { border-color: var(--ink-faint); }

.card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 7px;
  border-bottom: 1px solid var(--hairline-2);
}
.card-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--ink-faint);
  text-transform: uppercase;
}
.card-num b { color: var(--accent); font-weight: 600; margin-right: 6px; }
.card-title {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
}
.card-summary {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--ink-mute);
  text-align: right;
  font-variant-numeric: tabular-nums;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.card-body { display: flex; flex-direction: column; gap: 3px; flex: 1; }

.row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  padding: 3px 0;
  border-bottom: 1px dotted var(--hairline-2);
  gap: 12px;
}
.row:last-child { border-bottom: none; }
.row-label {
  color: var(--ink-2);
  font-size: 13px;
  letter-spacing: 0.01em;
}
.row-value {
  color: var(--ink);
  font-size: 16px;
  font-family: 'JetBrains Mono', monospace;
  font-variant-numeric: tabular-nums;
  font-weight: 500;
  text-align: right;
}

.sub {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-top: 6px;
  margin-bottom: 2px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.sub::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--hairline-2);
}
.sub:first-child { margin-top: 0; }

.note {
  color: var(--ink-mute);
  font-size: 12px;
  line-height: 1.5;
  padding-top: 8px;
  margin-top: auto;
  border-top: 1px solid var(--hairline-2);
  font-style: italic;
}
.note::before {
  content: '※';
  color: var(--accent);
  margin-right: 6px;
  font-style: normal;
}

.gears {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(46px, 1fr));
  gap: 5px;
  margin-top: 4px;
}
.gear {
  text-align: center;
  padding: 5px 4px;
  background: var(--field-bg);
  border: 1px solid var(--hairline-2);
  border-radius: 2px;
}
.gear-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px;
  letter-spacing: 0.12em;
  color: var(--ink-faint);
  text-transform: uppercase;
}
.gear-val {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  margin-top: 1px;
}

.locked-msg {
  color: var(--ink-faint);
  font-size: 11px;
  font-style: italic;
  padding: 12px 0;
  text-align: center;
  border: 1px dashed var(--hairline);
  border-radius: 2px;
}

/* ---------- modal ---------- */
.modal-backdrop {
  display: none;
  position: fixed; inset: 0;
  background: oklch(0 0 0 / 0.55);
  backdrop-filter: blur(4px);
  z-index: 200;
  justify-content: center;
  align-items: center;
}
.modal-backdrop.open { display: flex; }
.modal {
  background: var(--card-bg);
  border: 1px solid var(--hairline);
  border-radius: 3px;
  width: 380px;
  max-width: 90vw;
  position: relative;
}
.modal::before {
  content: '';
  position: absolute;
  top: -1px; left: -1px;
  width: 14px; height: 14px;
  border-top: 1.5px solid var(--accent);
  border-left: 1.5px solid var(--accent);
}
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--hairline);
}
.modal-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink);
}
.modal-close {
  background: none;
  border: none;
  color: var(--ink-mute);
  font-size: 20px;
  cursor: pointer;
  line-height: 1;
}
.modal-close:hover { color: var(--ink); }

.sources-list { list-style: none; padding: 6px 16px 12px; }
.sources-list li {
  padding: 8px 0;
  border-bottom: 1px dotted var(--hairline-2);
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.sources-list li:last-child { border-bottom: none; }
.sources-list .src-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: var(--ink-faint);
  letter-spacing: 0.12em;
}
.sources-list a {
  color: var(--ink);
  font-size: 13px;
}
.sources-list a:hover { color: var(--accent); }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .app-header { padding: 10px 16px; flex-wrap: wrap; }
  .inputs { padding: 12px 16px; }
  .summary { padding: 10px 16px; grid-template-columns: 1fr; }
  .summary-goal { text-align: left; align-items: flex-start; }
  .sheet { padding: 14px 16px 60px; gap: 12px; }
  .header-meta { display: none; }
  .brand-tag { display: none; }
}
@media (max-width: 560px) {
  .input-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .field--wide { grid-column: span 2; }
}

/* ---------- print ---------- */
@media print {
  body { background: white; color: black; }
  .app-header, .inputs, .modal-backdrop { display: none !important; }
  .sheet { grid-template-columns: repeat(2, 1fr); }
  .card { break-inside: avoid; border: 1px solid #333; }
}