/* Palettes mirror src/saeCalculator/ui/theme.py — keep them in sync. */
:root {
  --windowBackground: #f4f3ef;
  --displayBackground: #ffffff;
  --displayBorder: #d5d3cb;
  --expressionText: #8a887c;
  --displayText: #1f1e1b;
  --buttonBackground: #ffffff;
  --buttonText: #1f1e1b;
  --buttonBorder: #d5d3cb;
  --buttonPressed: #e9e7e1;
  --operatorText: #5f5e5a;
  --unitBorder: #b9b7af;
  --clearText: #a32d2d;
  --fractionBackground: #e6f1fb;
  --fractionText: #185fa5;
  --fractionBorder: #b5d4f4;
  --fractionPressed: #cfe3f6;
  --equalsBackground: #2c2c2a;
  --equalsText: #ffffff;
  --equalsPressed: #444441;
  --switchTrackOff: #b9b7af;
  --switchTrackOn: #185fa5;
  --donateBackground: #f0b232;
  --donateText: #1f1e1b;
  --donatePressed: #d9991f;
  --linkColor: #185fa5;
}

:root[data-theme="dark"] {
  --windowBackground: #22211f;
  --displayBackground: #2c2b29;
  --displayBorder: #454440;
  --expressionText: #98968a;
  --displayText: #f0eee8;
  --buttonBackground: #32312e;
  --buttonText: #f0eee8;
  --buttonBorder: #454440;
  --buttonPressed: #454440;
  --operatorText: #b4b2a9;
  --unitBorder: #5f5e5a;
  --clearText: #f09595;
  --fractionBackground: #0c344f;
  --fractionText: #85b7eb;
  --fractionBorder: #185fa5;
  --fractionPressed: #10456a;
  --equalsBackground: #e9e7e1;
  --equalsText: #1f1e1b;
  --equalsPressed: #cfcdc5;
  --switchTrackOff: #5f5e5a;
  --switchTrackOn: #378add;
  --linkColor: #85b7eb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--windowBackground);
  color: var(--displayText);
  font-family: "Segoe UI", system-ui, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
}

a { color: var(--linkColor); }

.siteHeader { text-align: center; padding: 28px 16px 8px; }
.siteHeader .appIcon { width: 64px; height: 64px; }
.siteHeader h1 { font-size: 26px; margin: 10px 0 6px; }
.tagline { color: var(--operatorText); max-width: 420px; margin: 0 auto; }

/* Calculator card — sized and styled to match the desktop app window. */
.calculator {
  width: min(342px, 94vw);
  background: var(--windowBackground);
  border: 1px solid var(--displayBorder);
  border-radius: 16px;
  padding: 14px;
  margin: 20px auto;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.12);
  user-select: none;
}

.themeRow { display: flex; align-items: center; gap: 6px; margin-bottom: 8px; }
.themeRow .spacer { flex: 1; }
.themeIcon { color: var(--operatorText); font-size: 14px; }

.toggleSwitch {
  width: 46px; height: 24px;
  border: none; border-radius: 12px;
  background: var(--switchTrackOff);
  position: relative; cursor: pointer; padding: 0;
  transition: background 120ms;
}
.toggleSwitch .knob {
  position: absolute; top: 3px; left: 3px;
  width: 18px; height: 18px; border-radius: 50%;
  background: #ffffff;
  transition: left 120ms;
}
.toggleSwitch[aria-checked="true"] { background: var(--switchTrackOn); }
.toggleSwitch[aria-checked="true"] .knob { left: 25px; }

.donateButton {
  height: 28px; border: none; border-radius: 14px;
  padding: 0 14px;
  background: var(--donateBackground); color: var(--donateText);
  font-size: 14px; font-weight: 600; font-family: inherit;
  cursor: pointer;
}
.donateButton:hover, .donateButton:active { background: var(--donatePressed); }

.companyButton {
  width: 32px; height: 32px;
  border: none; border-radius: 8px;
  background: transparent; padding: 0;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
}
.companyButton:hover { background: var(--buttonPressed); }
.companyButton img { width: 26px; height: 26px; display: block; }

.display {
  background: var(--displayBackground);
  border: 1px solid var(--displayBorder);
  border-radius: 10px;
  padding: 12px;
  text-align: right;
  margin-bottom: 8px;
  font-family: Consolas, "Cascadia Mono", Menlo, monospace;
}
.expression {
  color: var(--expressionText);
  font-size: 13px; min-height: 18px;
  overflow: hidden; white-space: nowrap;
}
.current { color: var(--displayText); font-size: 28px; font-weight: 600; min-height: 36px; }

.unitRow, .fractionRow, .mainGrid { display: grid; gap: 8px; margin-bottom: 8px; }
.unitRow { grid-template-columns: repeat(4, 1fr); }
.fractionRow { grid-template-columns: repeat(5, 1fr); }
.mainGrid { grid-template-columns: repeat(4, 1fr); margin-bottom: 0; }

.key {
  background: var(--buttonBackground);
  color: var(--buttonText);
  border: 1px solid var(--buttonBorder);
  border-radius: 10px;
  height: 52px;
  font-size: 21px; font-family: inherit;
  cursor: pointer;
}
.key:active { background: var(--buttonPressed); }
.unitKey { height: 44px; font-size: 17px; font-weight: 600; border-color: var(--unitBorder); }
.clearKey { color: var(--clearText); }
.fractionKey {
  height: 42px; font-size: 17px;
  background: var(--fractionBackground);
  color: var(--fractionText);
  border-color: var(--fractionBorder);
}
.fractionKey:active { background: var(--fractionPressed); }
.operatorKey { color: var(--operatorText); font-size: 23px; }
.equalsKey {
  grid-column: 1 / -1;
  height: 56px; font-size: 27px; font-weight: 600;
  background: var(--equalsBackground);
  color: var(--equalsText);
  border-color: var(--equalsBackground);
}
.equalsKey:active { background: var(--equalsPressed); }

.downloads { text-align: center; padding: 8px 16px 4px; color: var(--operatorText); }
.downloadButtons { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.siteButton {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 10px;
  border: 1px solid var(--unitBorder);
  color: var(--buttonText);
  text-decoration: none;
  font-weight: 600;
}
.siteButton.primary {
  background: var(--switchTrackOn);
  border-color: var(--switchTrackOn);
  color: #ffffff;
}
.hint { font-size: 13px; max-width: 420px; margin: 14px auto 0; }
.hint code {
  background: var(--buttonPressed);
  padding: 1px 5px; border-radius: 4px;
  font-family: Consolas, "Cascadia Mono", Menlo, monospace;
}

.aboutText {
  max-width: 460px;
  margin: 8px auto 0;
  padding: 0 16px;
  color: var(--operatorText);
  font-size: 14px;
  line-height: 1.6;
}
.aboutText h2 { color: var(--displayText); font-size: 18px; text-align: center; }

.siteFooter { margin-top: auto; padding: 24px 16px; font-size: 13px; color: var(--operatorText); }

.modalOverlay {
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.45);
  display: flex; align-items: center; justify-content: center;
  z-index: 10;
}
.modalOverlay.hidden { display: none; }
.modal {
  background: var(--displayBackground);
  border: 1px solid var(--displayBorder);
  border-radius: 12px;
  padding: 20px;
  width: min(340px, 90vw);
}
.modal h3 { margin: 8px 0 4px; }
.modal p { margin: 6px 0; font-size: 14px; }
.modal .muted { color: var(--expressionText); }
.modalButtons { display: flex; gap: 8px; justify-content: flex-end; margin-top: 14px; }
.modalButton {
  padding: 7px 16px;
  border-radius: 8px;
  border: 1px solid var(--unitBorder);
  background: var(--buttonBackground);
  color: var(--buttonText);
  font-family: inherit; font-size: 14px; font-weight: 600;
  cursor: pointer;
}
.modalButton:active { background: var(--buttonPressed); }
.modalButton.primary {
  background: var(--switchTrackOn);
  border-color: var(--switchTrackOn);
  color: #ffffff;
}