:root {
  --bg: #f6f3ee;
  --surface: #fffef9;
  --ink: #1c1917;
  --muted: #57534e;
  --accent: #b45309;
  --accent-soft: rgba(180, 83, 9, 0.12);
  --border: #e7e5e4;
  --success-bg: #ecfdf5;
  --success-border: #a7f3d0;
  --warn-bg: #fffbeb;
  --warn-border: #fcd34d;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(28, 25, 23, 0.06), 0 8px 24px rgba(28, 25, 23, 0.06);
  --font-sans: "Source Sans 3", system-ui, sans-serif;
  --font-ar: "Noto Sans Arabic", "Source Sans 3", system-ui, sans-serif;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.5;
}

html[lang="ar"] {
  font-family: var(--font-ar);
}

html[lang="ar"] h1,
html[lang="ar"] .card h2 {
  font-family: var(--font-ar);
  font-weight: 700;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: clip;
}

.page {
  max-width: 1040px;
  margin: 0 auto;
  padding-top: max(1.5rem, env(safe-area-inset-top, 0px));
  padding-bottom: max(2.5rem, env(safe-area-inset-bottom, 0px));
  padding-left: max(min(1.25rem, 5vw), env(safe-area-inset-left, 0px));
  padding-right: max(min(1.25rem, 5vw), env(safe-area-inset-right, 0px));
}

.top-bar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 1rem;
}

html[dir="rtl"] .top-bar {
  justify-content: flex-start;
}

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.lang-btn {
  font: inherit;
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.55rem 0.95rem;
  min-height: 2.75rem;
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  touch-action: manipulation;
}

.lang-btn:hover {
  color: var(--ink);
  background: var(--accent-soft);
}

.lang-btn.is-active {
  background: var(--accent);
  color: #fff;
}

.lang-btn.is-active:hover {
  filter: brightness(1.05);
  color: #fff;
}

.hero {
  margin-bottom: 2rem;
}

.eyebrow {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 0 0 0.5rem;
}

html[dir="rtl"] .eyebrow {
  text-transform: none;
  letter-spacing: 0;
}

h1 {
  font-family: "Crimson Pro", Georgia, serif;
  font-weight: 600;
  font-size: clamp(2rem, 4vw, 2.75rem);
  line-height: 1.15;
  margin: 0 0 0.75rem;
  color: var(--ink);
}

.lede {
  margin: 0;
  max-width: 65ch;
  color: var(--muted);
  font-size: 1.05rem;
}

.lede strong {
  color: var(--ink);
}

.cross-nav {
  margin: 0.75rem 0 0;
  font-size: 0.95rem;
}

.cross-nav a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

.cross-nav a:hover {
  text-decoration: underline;
}

.cross-nav--multi {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.75rem;
}

.cross-nav-sep {
  color: var(--muted);
  user-select: none;
}

.layout {
  display: grid;
  gap: 1.5rem;
  min-width: 0;
}

@media (min-width: 880px) {
  .layout {
    grid-template-columns: 1.2fr 0.85fr;
    align-items: start;
  }
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.5rem 1.75rem;
  box-shadow: var(--shadow);
  min-width: 0;
}

.card h2 {
  font-family: "Crimson Pro", Georgia, serif;
  font-size: 1.35rem;
  margin: 0 0 1.25rem;
}

.field-group {
  border: none;
  margin: 0 0 1.25rem;
  padding: 0;
}

.field-group legend {
  font-weight: 600;
  margin-bottom: 0.5rem;
  padding: 0;
}

.radio {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  margin-bottom: 0.5rem;
  cursor: pointer;
  font-size: 0.95rem;
  color: var(--ink);
}

.radio input {
  margin-top: 0.35rem;
  accent-color: var(--accent);
}

.grid-inputs {
  display: grid;
  gap: 1rem;
  min-width: 0;
}

.field-span {
  min-width: 0;
}

@media (min-width: 520px) {
  .grid-inputs {
    grid-template-columns: 1fr 1fr;
  }
  .field-span {
    grid-column: 1 / -1;
  }
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.field span {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--muted);
}

.field input,
.input-num {
  font: inherit;
  font-size: 1rem;
  padding: 0.65rem 0.75rem;
  min-height: 2.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  width: 100%;
  max-width: 100%;
  touch-action: manipulation;
}

.input-num {
  text-align: start;
}

.field input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.field input:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.breakdown-legend {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--muted);
  margin: 0 0 0.75rem;
}

.karat-breakdown {
  margin-bottom: 0;
  min-width: 0;
}

.grid-karat-row {
  display: grid;
  gap: 1rem;
  min-width: 0;
  /* Wrap into fewer columns when the card is narrow (e.g. beside the reference aside). */
  grid-template-columns: repeat(
    auto-fit,
    minmax(min(100%, 7.75rem), 1fr)
  );
}

.grid-karat-row > .field {
  min-width: 0;
}

.grid-karat-row .field input {
  width: 100%;
  min-width: 0;
}

.pure-sum-preview {
  margin-top: 0.75rem;
  margin-bottom: 0;
}

.hint {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 1rem 0 0;
}

.hint code {
  font-size: 0.8rem;
  background: var(--accent-soft);
  padding: 0.15rem 0.35rem;
  border-radius: 4px;
  color: var(--ink);
  direction: ltr;
  unicode-bidi: isolate;
  display: inline-block;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

html[dir="rtl"] .actions {
  flex-direction: row-reverse;
}

.btn {
  font: inherit;
  font-weight: 600;
  font-size: 1rem;
  padding: 0.7rem 1.25rem;
  min-height: 2.75rem;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  touch-action: manipulation;
}

.btn.primary {
  background: var(--accent);
  color: #fff;
}

.btn.primary:hover {
  filter: brightness(1.05);
}

.btn.ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--muted);
}

.btn.ghost:hover {
  border-color: var(--muted);
  color: var(--ink);
}

.result {
  margin-top: 1.25rem;
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-size: 0.95rem;
}

.result[data-variant="ok"] {
  background: var(--success-bg);
  border-color: var(--success-border);
}

.result[data-variant="info"] {
  background: var(--warn-bg);
  border-color: var(--warn-border);
}

.result[data-variant="neutral"] {
  background: #f5f5f4;
}

.result h3 {
  font-size: 1rem;
  margin: 0 0 0.5rem;
}

.result p {
  margin: 0.35rem 0;
}

.result .big {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
  margin-top: 0.5rem;
}

.ref-list {
  margin: 0;
  padding-inline-start: 1.1rem;
  padding-inline-end: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.ref-list li {
  margin-bottom: 0.6rem;
}

.ref-list strong {
  color: var(--ink);
}

.disclaimer {
  margin: 1.25rem 0 0;
  font-size: 0.8rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}

.footer {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--muted);
}

.footer p {
  margin: 0;
}

.ref-list a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
  padding-block: 0.35rem;
}

.ref-list a:hover {
  text-decoration: underline;
}

@media (max-width: 639px) {
  .card {
    padding: 1.25rem 1.1rem 1.5rem;
  }

  .card h2 {
    font-size: 1.2rem;
  }

  .lede {
    font-size: 1rem;
  }

  .radio {
    font-size: 0.9rem;
  }

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

  html[dir="rtl"] .actions {
    flex-direction: column;
  }

  .actions .btn {
    width: 100%;
    text-align: center;
  }

  .result {
    padding: 0.9rem 1rem;
    word-break: break-word;
  }

  .result .big {
    font-size: 1.1rem;
    line-height: 1.35;
  }
}

@media (max-width: 380px) {
  .lang-btn {
    padding-inline: 0.75rem;
    font-size: 0.8rem;
  }

  h1 {
    font-size: clamp(1.65rem, 8vw, 2.75rem);
  }
}