/* ==========================================================================
   Calculator
   ========================================================================== */

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

:root {
  --font: ui-rounded, "SF Pro Rounded", -apple-system, BlinkMacSystemFont, "Segoe UI Variable Display",
    "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Mono", "Roboto Mono", Menlo, Consolas, monospace;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --accent: #ff9f0a;
}

/* ---------- Dark theme (the default) ---------- */
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b0c0f;
  --glow-1: rgba(255, 159, 10, 0.14);
  --glow-2: rgba(99, 102, 241, 0.16);
  --card: rgba(21, 23, 28, 0.86);
  --card-border: rgba(255, 255, 255, 0.07);
  --card-shadow: 0 50px 100px -30px rgba(0, 0, 0, 0.75), inset 0 1px 0 rgba(255, 255, 255, 0.04);
  --text: #f5f6f8;
  --muted: #868b96;
  --key: #23262d;
  --key-hover: #2a2e36;
  --key-active: #343943;
  --key-text: #f5f6f8;
  --key-fn: #2f333c;
  --key-fn-hover: #373c46;
  --key-fn-active: #424854;
  --key-fn-text: #cfd3da;
  --key-op: rgba(255, 159, 10, 0.15);
  --key-op-hover: rgba(255, 159, 10, 0.22);
  --key-op-active: rgba(255, 159, 10, 0.3);
  --key-op-text: #ffac33;
  --key-eq-text: #2b1800;
  --key-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.045);
  --toggle-track: #23262d;
  --toggle-thumb: #3b404b;
}

/* ---------- Light theme ---------- */
:root[data-theme="light"] {
  color-scheme: light;
  --bg: #e9ecf1;
  --glow-1: rgba(255, 159, 10, 0.2);
  --glow-2: rgba(99, 102, 241, 0.14);
  --card: rgba(255, 255, 255, 0.82);
  --card-border: rgba(15, 23, 42, 0.06);
  --card-shadow: 0 50px 90px -40px rgba(30, 41, 59, 0.4), 0 2px 8px rgba(30, 41, 59, 0.05);
  --text: #111318;
  --muted: #6b7180;
  --key: #f1f3f6;
  --key-hover: #e9ecf0;
  --key-active: #dfe3e9;
  --key-text: #15171c;
  --key-fn: #e3e6ec;
  --key-fn-hover: #d9dde4;
  --key-fn-active: #cfd4dc;
  --key-fn-text: #3a4150;
  --key-op: rgba(255, 149, 0, 0.13);
  --key-op-hover: rgba(255, 149, 0, 0.2);
  --key-op-active: rgba(255, 149, 0, 0.28);
  --key-op-text: #e57a00;
  --key-eq-text: #2b1800;
  --key-shadow: 0 1px 2px rgba(15, 23, 42, 0.06), inset 0 -1px 0 rgba(15, 23, 42, 0.04);
  --toggle-track: #e3e6ec;
  --toggle-thumb: #ffffff;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-tap-highlight-color: transparent;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  transition: background-color 0.35s ease, color 0.35s ease;
}

body.is-vault-open {
  overflow: hidden;
}

.sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.icon {
  width: 24px;
  height: 24px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

[hidden] {
  display: none !important;
}

/* Theme switch: a circular reveal via the View Transitions API (see app.js). */
::view-transition-old(root),
::view-transition-new(root) {
  animation: none;
  mix-blend-mode: normal;
}

.is-theme-switching *,
.is-theme-switching *::before,
.is-theme-switching *::after {
  transition: none !important;
}

/* ==========================================================================
   Calculator
   ========================================================================== */

.calc-screen {
  position: relative;
  isolation: isolate;
  display: grid;
  /* minmax(0, 1fr) stops a very long number from stretching the whole layout */
  grid-template-columns: minmax(0, 1fr);
  place-items: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding: 24px;
  overflow: hidden;
}

/* Soft background glow */
.calc-screen::before,
.calc-screen::after {
  content: "";
  position: absolute;
  z-index: -1;
  width: 70vmax;
  height: 70vmax;
  border-radius: 50%;
  pointer-events: none;
  transition: background 0.35s ease;
}

.calc-screen::before {
  top: -30vmax;
  right: -25vmax;
  background: radial-gradient(closest-side, var(--glow-1), transparent);
}

.calc-screen::after {
  bottom: -35vmax;
  left: -30vmax;
  background: radial-gradient(closest-side, var(--glow-2), transparent);
}

.calc {
  display: flex;
  flex-direction: column;
  width: min(100%, 384px);
  min-width: 0;
  padding: 18px 20px 22px;
  border: 1px solid var(--card-border);
  border-radius: 38px;
  background: var(--card);
  box-shadow: var(--card-shadow);
  -webkit-backdrop-filter: blur(24px) saturate(140%);
  backdrop-filter: blur(24px) saturate(140%);
  transition: background-color 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}

.calc__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2px 4px 0 8px;
}

.calc__title {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--muted);
}

/* ---------- Theme toggle ---------- */
.theme-toggle {
  -webkit-appearance: none;
  appearance: none;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: inherit;
  cursor: pointer;
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.theme-toggle__track {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 64px;
  height: 34px;
  padding: 0 9px;
  border-radius: 999px;
  background: var(--toggle-track);
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.22);
  transition: background-color 0.35s ease;
}

.theme-toggle__thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--toggle-thumb);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.28);
  transition: transform 0.45s var(--ease-out), background-color 0.35s ease;
}

:root[data-theme="light"] .theme-toggle__thumb {
  transform: translateX(30px);
}

.theme-toggle__icon {
  position: relative;
  width: 16px;
  height: 16px;
  stroke-width: 2.2;
  color: var(--muted);
  transition: color 0.35s ease, transform 0.45s var(--ease-out);
}

:root[data-theme="dark"] .theme-toggle__icon--moon {
  color: #ffd27d;
}

:root[data-theme="light"] .theme-toggle__icon--sun {
  color: #ff9500;
  transform: rotate(90deg);
}

/* ---------- Display ---------- */
.display {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: 176px;
  padding: 18px 8px 14px;
  text-align: right;
}

.display__history,
.display__preview {
  display: flex;
  justify-content: flex-end;
  overflow: hidden;
  white-space: nowrap;
  color: var(--muted);
}

.display__history {
  min-height: 26px;
  font-size: 19px;
  line-height: 26px;
}

.display__main {
  --display-size: 66px;
  min-height: calc(var(--display-size) * 1.18);
  overflow-x: auto;
  overflow-y: hidden;
  font-size: calc(var(--display-size) * var(--fit, 1));
  font-weight: 300;
  line-height: 1.18;
  letter-spacing: -0.03em;
  white-space: nowrap;
  color: var(--text);
  scrollbar-width: none;
  -webkit-user-select: text;
  user-select: text;
}

.display__main::-webkit-scrollbar {
  display: none;
}

.display__main.is-error {
  letter-spacing: -0.01em;
}

.display__preview {
  min-height: 30px;
  margin-top: 2px;
  font-size: 23px;
  line-height: 30px;
}

/* ---------- Keypad ---------- */
.keypad {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  -webkit-user-select: none;
  user-select: none;
}

.key {
  -webkit-appearance: none;
  appearance: none;
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 24px;
  background: var(--key);
  box-shadow: var(--key-shadow);
  color: var(--key-text);
  font: inherit;
  font-size: 29px;
  font-weight: 500;
  line-height: 1;
  cursor: pointer;
  touch-action: manipulation;
  transition: background-color 0.18s ease, color 0.35s ease, box-shadow 0.35s ease, transform 0.16s var(--ease-out);
}

.key:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.key .icon {
  width: 27px;
  height: 27px;
  stroke-width: 2.1;
}

.key--dot {
  font-size: 34px;
  font-weight: 700;
}

.key--fn {
  background: var(--key-fn);
  color: var(--key-fn-text);
  font-size: 23px;
  font-weight: 600;
}

.key--fn .icon {
  width: 25px;
  height: 25px;
}

.key--op {
  background: var(--key-op);
  color: var(--key-op-text);
}

.key--op .icon {
  width: 29px;
  height: 29px;
  stroke-width: 2.4;
}

.key--eq {
  background: linear-gradient(160deg, #ffb547 0%, #ff8a00 100%);
  box-shadow: 0 14px 30px -12px rgba(255, 138, 0, 0.75), inset 0 1px 0 rgba(255, 255, 255, 0.35);
  color: var(--key-eq-text);
}

.key--eq .icon {
  width: 30px;
  height: 30px;
  stroke-width: 2.6;
}

@media (hover: hover) {
  .key:hover {
    background-color: var(--key-hover);
  }

  .key--fn:hover {
    background-color: var(--key-fn-hover);
  }

  .key--op:hover {
    background-color: var(--key-op-hover);
  }

  .key--eq:hover {
    filter: brightness(1.06);
  }
}

.key:active,
.key.is-pressed {
  transform: scale(0.93);
  background-color: var(--key-active);
  transition-duration: 0.06s;
}

.key--fn:active,
.key--fn.is-pressed {
  background-color: var(--key-fn-active);
}

.key--op:active,
.key--op.is-pressed {
  background-color: var(--key-op-active);
}

.key--eq:active,
.key--eq.is-pressed {
  filter: brightness(0.94);
}

/* ---------- Smaller screens ---------- */
@media (min-width: 521px) and (max-height: 780px) {
  .display {
    min-height: 140px;
    padding-top: 10px;
  }

  /* Keys fill their column and only get shorter, so the card never needs scrolling */
  .key {
    aspect-ratio: auto;
    height: 64px;
    height: clamp(40px, calc((100dvh - 340px) / 5), 64px);
    border-radius: 22px;
  }
}

/* Phones: the calculator fills the screen */
@media (max-width: 520px) {
  .calc-screen {
    place-items: stretch;
    padding: 0;
  }

  .calc {
    width: 100%;
    min-height: 100vh;
    min-height: 100dvh;
    padding: calc(env(safe-area-inset-top) + 12px) 18px calc(env(safe-area-inset-bottom) + 22px);
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }

  .display {
    flex: 1;
    min-height: 150px;
  }

  .display__main {
    --display-size: clamp(56px, 19vw, 84px);
  }

  /* Square keys, but shorter when browser toolbars eat into the height */
  .key {
    aspect-ratio: auto;
    height: calc((100vw - 72px) / 4);
    height: min(calc((100vw - 72px) / 4), calc((100dvh - 310px - env(safe-area-inset-top) - env(safe-area-inset-bottom)) / 5));
    border-radius: clamp(16px, 6vw, 24px);
  }
}

/* Short landscape phones */
@media (max-height: 540px) and (orientation: landscape) {
  .calc-screen {
    padding: 8px;
  }

  .calc {
    min-height: 0;
    padding: 8px 16px 10px;
    border-radius: 26px;
  }

  .display {
    flex: none;
    min-height: 0;
    padding: 0 8px 4px;
  }

  .display__main {
    --display-size: 40px;
  }

  .display__history,
  .display__preview {
    min-height: 18px;
    font-size: 14px;
    line-height: 18px;
  }

  .keypad {
    gap: 6px;
  }

  .key {
    aspect-ratio: auto;
    height: 40px;
    height: clamp(26px, calc((100dvh - 186px) / 5), 64px);
    border-radius: 14px;
    font-size: 21px;
  }

  .key .icon {
    width: 22px;
    height: 22px;
  }
}

/* UnblockedTube's styles live in unblockedtube.css */

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}