* { box-sizing: border-box; }

:root {
  --primary: #3330F9;
  --primary-dark: #0A06DF;
  --primary-bg: #E7E6FE; 
  --primary-subtle: #C3C2FD; 
  --text: #202124;
  --muted: #68707a;
  --border: #dedfe3;
  --background: #f7f7f8;
  --soft: #f0f0f2;
  --success: #18794e;
  --success-soft: #e8f5ef;
  --danger: #c62839;
  --danger-soft: #fbeaec;
  --warning: #a05a00;
  --warning-soft: #fdf1e0;
}

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--background);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.5;
}

button, input, select { font: inherit; }

.float-backhome {
  .back-link {
    padding: 0.5rem;
    border: 1px solid var(--border);
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    vertical-align: middle;
    gap: 0.5rem;
    color: var(--primary);
    border-radius: 0.5rem;
    margin-top: 1rem;
    font-size: 0.875rem;
    line-height: 1;
    span {
      font-size: 1rem;
    }
    &:hover {
      background-color: var(--primary-bg);
    }
  }
}

@media (min-width: 990px) {
  .float-backhome {
    position: fixed;
    top: 1rem;
  }
}

.site-header {
  text-align: center;
  padding: 34px 20px 28px;
}

.site-header h1 {
  margin: 0 0 7px;
  font-size: clamp(29px, 4vw, 38px);
  line-height: 1.2;
}

.site-header p {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
}

.container {
  width: min(900px, calc(100% - 32px));
  margin: 0 auto 52px;
}

.container-wide { width: min(1080px, calc(100% - 32px)); }

.tool-card {
  background: #fff;
  border-radius: 9px;
  padding: 24px;
  box-shadow: 0 1px 5px rgba(0, 0, 0, .04);
}

.tool-card + .tool-card { margin-top: 20px; }

.tool-intro { margin-bottom: 20px; }
.tool-intro h2 { margin: 0 0 5px; font-size: 21px; }
.tool-intro p { margin: 0; color: var(--muted); }

.grid-area {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
}

/* ---------- Color inputs ---------- */

.color-inputs {
  display: grid;
  /* grid-template-columns: 1fr auto 1fr; */
  grid-template-columns: 1fr;
  align-items: center;
  gap: 14px;
  padding: 18px;
  background: #f4f4f5;
  border-radius: 8px;
}

.color-panel { min-width: 0; }

.color-panel-head h3 {
  margin: 0 0 10px;
  font-size: 14px;
  font-weight: 700;
}

.color-panel-sub {
  font-weight: 400;
  color: var(--muted);
  font-size: 12px;
}

.color-panel-body {
  display: flex;
  gap: 6px;
  align-items: start;
  flex-direction: column;
}

.color-swatch {
  -webkit-appearance: none;
  appearance: none;
  width: 32px;
  height: 32px;
  flex: 0 0 32px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: none;
  cursor: pointer;
}

.color-swatch::-webkit-color-swatch-wrapper { padding: 3px; }
.color-swatch::-webkit-color-swatch { border: 0; border-radius: 5px; }
.color-swatch::-moz-color-swatch { border: 0; border-radius: 5px; }

.color-fields { flex: 1; min-width: 0; }

.format-tabs {
  display: inline-flex;
  gap: 2px;
  padding: 2px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  /* margin-bottom: 6px; */
}

.format-tab {
  border: 0;
  background: none;
  padding: 4px 9px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 700;
  color: var(--muted);
  cursor: pointer;
  letter-spacing: .02em;
}

.format-tab.active { background: var(--primary); color: #fff; }

.color-field-box {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  cursor: text;
}
 
.color-field-box:focus-within {
  outline: 3px solid rgba(91,91,240,.25);
  outline-offset: 2px;
}

.color-field-box:has(.color-text.invalid) { border-color: #c62839; background: #fbeaec; }

.color-text {
  flex: 1;
  min-width: 0;
  border: 0;
  padding: 0;
  background: none;
  color: var(--text);
  font-weight: 600;
  font-size: 14.5px;
}

.color-text:focus-visible { outline: none; }

.color-text.invalid { border-color: var(--danger); background: var(--danger-soft); }

.swap-button {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--primary);
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
  justify-self: center;
  transition: transform .15s, background .15s;
}

.swap-button:hover { background: var(--primary-bg); transform: rotate(180deg); }

/* ---------- Text controls ---------- */

.text-controls {
  padding: 18px;
  background: #f4f4f5;
  border-radius: 8px;
  margin-top: 1.2rem;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 16px 20px;
}

.field { min-width: 0; }

.field label {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
  font-weight: 600;
  font-size: 13.5px;
}

.field small { display: block; margin-top: 6px; color: var(--muted); font-size: 11.5px; }

.field-text input[type="text"],
input[type="range"] { width: 100%; }

.field-text input[type="text"] {
  min-height: 42px;
  padding: 9px 11px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  color: var(--text);
}

input[type="range"] { accent-color: var(--primary); margin-top: 6px; }

.segmented {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  width: 100%;
}

.segmented-btn {
  flex: 1;
  border: 0;
  background: #fff;
  padding: 10px 9px;
  font-weight: 600;
  font-size: 13px;
  color: var(--text);
  cursor: pointer;
  border-right: 1px solid var(--border);
}

.segmented-btn:last-child { border-right: 0; }
.segmented-btn.active { background: var(--primary); color: #fff; }

.classification-badge {
  display: inline-flex;
  align-self: flex-start;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--primary-bg);
  color: var(--primary-dark);
  font-weight: 700;
  font-size: 13px;
}

.field-classification label { margin-bottom: 6px; }

/* ---------- Contrast result ---------- */

.contrast-result {
  padding: 20px;
  border-radius: 10px;
  background: var(--text);
  color: #fff;
  display: grid;
  grid-template-columns: 1fr;
  align-items: center;
  gap: 24px;
}

.ratio-display { text-align: center; }

.ratio-number { display: flex; align-items: baseline; justify-content: center; gap: 3px; }
.ratio-value { font-size: 44px; font-weight: 800; line-height: 1; }
.ratio-suffix { font-size: 20px; color: rgba(255,255,255,.65); font-weight: 700; }
.ratio-label { display: block; margin-top: 6px; font-size: 12.5px; color: rgba(255,255,255,.65); text-transform: uppercase; letter-spacing: .04em; }

.result-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 24px; }

.result-col h4 { margin: 0 0 9px; font-size: 13px; color: rgba(255,255,255,.7); font-weight: 700; text-transform: uppercase; letter-spacing: .03em; }

.result-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 12px;
  border-radius: 7px;
  background: rgba(255,255,255,.06);
  margin-bottom: 7px;
}

.result-tag { font-weight: 700; font-size: 13.5px; }

.result-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 999px;
  font-weight: 800;
  font-size: 12.5px;
}

.result-badge.pass { background: var(--success-soft); color: var(--success); }
.result-badge.fail { background: var(--danger-soft); color: var(--danger); }

/* ---------- Preview ---------- */

.preview-section { margin-top: 20px; }

.preview-main {
  min-height: 130px;
  padding: 28px 26px;
  border-radius: 10px;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.preview-small-wrap { margin-top: 14px; }

.preview-small-label {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .03em;
}

.preview-small {
  padding: 16px 18px;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 14px;
  font-weight: 400;
  overflow-wrap: anywhere;
}

/* ---------- Simulations ---------- */

.simulations-card .tool-intro p { color: var(--muted); }

.sim-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.sim-tab {
  border: 1px solid var(--border);
  background: #fff;
  padding: 9px 16px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 13.5px;
  color: var(--muted);
  cursor: pointer;
}

.sim-tab.active { background: var(--text); color: #fff; border-color: var(--text); }

.sim-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 14px;
}

.sim-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  background: #fff;
}

.sim-card-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}

.sim-name { font-weight: 700; font-size: 13.5px; }
.sim-ratio { font-size: 13px; font-weight: 800; color: var(--muted); white-space: nowrap; }

.sim-desc {
  margin: 0 0 10px;
  font-size: 11.5px;
  line-height: 1.4;
  color: var(--muted);
  min-height: 30px;
}

.sim-preview {
  min-height: 44px;
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px 10px;
  text-align: center;
  overflow-wrap: anywhere;
  word-break: break-word;
  line-height: 1.25;
  margin-bottom: 8px;
}

.sim-size {
  font-size: 11px;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 8px;
}

.sim-checks { display: flex; gap: 7px; flex-wrap: wrap; }

.sim-chip {
  font-size: 11px;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: 999px;
}

.sim-chip.pass { background: var(--success-soft); color: var(--success); }
.sim-chip.fail { background: var(--danger-soft); color: var(--danger); }

.sim-note {
  grid-column: 1 / -1;
  font-size: 12px;
  color: var(--muted);
  margin: -4px 0 4px;
}

/* ---------- Content / FAQ ---------- */

.content-section { margin-top: 32px; padding: 0 4px; }
.content-section h2 { margin: 0 0 10px; font-size: 25px; }
.content-section h3 { margin: 26px 0 7px; font-size: 19px; }
.content-section p, .content-section li { color: #454a51; }
.content-section ol { padding-left: 23px; }

.site-footer {
  margin-top: auto;
  padding: 18px;
  text-align: center;
  background: #ededee;
  color: #30343a;
}

.site-footer p { margin: 0; }

@media (max-width: 760px) {
  .site-header { padding-top: 26px; }
  .tool-card { padding: 17px; }

  .color-inputs { grid-template-columns: 1fr; }
  .swap-button { justify-self: center; transform: rotate(90deg); }
  .swap-button:hover { transform: rotate(270deg); }

  .text-controls { grid-template-columns: 1fr 1fr; }
  .field-text { grid-column: 1 / -1; }
  .field-classification { grid-column: 1 / -1; }

  .contrast-result { grid-template-columns: 1fr; }
  .ratio-display { border-right: 0; border-bottom: 1px solid rgba(255,255,255,.18); padding-right: 0; padding-bottom: 16px; }

  .sim-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
}

@media (max-width: 460px) {
  .text-controls { grid-template-columns: 1fr; }
  .result-grid { grid-template-columns: 1fr; }
}