/* Scientific Calculator — a dark, native-feeling mobile app. Deliberately
   distinct from the (light) framework website: its own palette, app bar, big
   display, and rounded keypad. Class names match the Python markup. */
:root {
  color-scheme: dark;
  --calc-bg: #0c0e13;
  --calc-panel: #161a21;
  --calc-panel-2: #1e232c;
  --calc-line: #2b323d;
  --calc-ink: #eef2f7;
  --calc-muted: #8a94a2;
  --calc-accent: #ff9f0a;
  --calc-accent-ink: #23140a;
  --calc-op: #2a3948;
  --calc-fn: #202632;
  --calc-danger: #ff5d5d;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, system-ui, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", Consolas, monospace;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
body[data-page="calculator"] { min-height: 100dvh; margin: 0; background: var(--calc-bg); color: var(--calc-ink); font-family: var(--font-sans); }

/* App bar */
.calc-appbar { position: sticky; z-index: 20; top: 0; display: flex; min-height: 60px; align-items: center; justify-content: space-between; gap: 16px; padding: max(8px, env(safe-area-inset-top)) 16px 8px; background: color-mix(in srgb, var(--calc-bg) 86%, transparent); backdrop-filter: blur(14px); border-bottom: 1px solid var(--calc-line); }
.calc-appbrand { display: flex; align-items: center; gap: 10px; color: inherit; font: 800 14px/1 var(--font-sans); letter-spacing: -.01em; text-decoration: none; }
.calc-appicon { display: grid; width: 38px; height: 38px; place-items: center; border-radius: 11px; background: var(--calc-accent); color: var(--calc-accent-ink); font-size: 20px; }
.calc-appbrand br { display: none; }
.calc-runtime { display: flex; align-items: center; gap: 7px; font: 700 11px var(--font-sans); color: var(--calc-muted); text-transform: uppercase; }
.calc-runtime span { width: 8px; height: 8px; border-radius: 50%; background: #35d07f; box-shadow: 0 0 0 3px color-mix(in srgb, #35d07f 25%, transparent); }
.calc-runtime.offline span { background: var(--calc-danger); box-shadow: 0 0 0 3px color-mix(in srgb, var(--calc-danger) 25%, transparent); }
.calc-app-actions { display: flex; align-items: center; gap: 10px; }
.calc-app-action { display: flex; min-height: 38px; align-items: center; gap: 6px; padding: 0 12px; border: 1px solid var(--calc-line); border-radius: 11px; background: var(--calc-panel-2); color: var(--calc-ink); font: 800 12px var(--font-sans); cursor: pointer; }
.calc-update { display: flex; align-items: center; justify-content: center; gap: 15px; padding: 10px 14px; background: var(--calc-panel-2); border-bottom: 1px solid var(--calc-line); font: 700 13px var(--font-sans); }
.calc-update[hidden] { display: none; }
.calc-update button { padding: 7px 12px; border: 0; border-radius: 9px; background: var(--calc-accent); color: var(--calc-accent-ink); font-weight: 800; }

body[data-page="calculator"] .calc-wrap { width: min(100%, 1100px); max-width: none !important; margin: 0 auto; padding: 14px 14px calc(28px + env(safe-area-inset-bottom)) !important; }
.calculator { display: grid; gap: 14px; }
.calc-hero { display: none; }
.calc-badge { display: none; }
.calc-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }

.calc-panel { display: grid; gap: 13px; padding: 16px; border: 1px solid var(--calc-line); border-radius: 20px; background: var(--calc-panel); }
.calc-panel-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.calc-panel h2 { display: flex; align-items: center; gap: 9px; margin: 0; font: 800 16px var(--font-sans); letter-spacing: -.01em; }
.calc-panel h2 i { display: grid; width: 32px; height: 32px; place-items: center; border-radius: 10px; background: var(--calc-panel-2); color: var(--calc-accent); }
.calc-muted { margin: 0; color: var(--calc-muted); font: 13px/1.45 var(--font-sans); }

.calc-fields { display: grid; gap: 9px; }
.calc-field { display: grid; grid-template-columns: 40px minmax(0, 1fr); align-items: center; gap: 10px; }
.calc-label { font: 800 16px var(--font-mono); text-align: center; color: var(--calc-muted); }
.calc-input { width: 100%; min-width: 0; min-height: 50px; padding: 12px 14px; border: 1px solid var(--calc-line); border-radius: 14px; outline: 0; background: var(--calc-panel-2); color: var(--calc-ink); font: 600 17px/1.3 var(--font-mono); }
.calc-input:focus { border-color: var(--calc-accent); }

.calc-toolbar { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.calc-keypad { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 8px; }
.calc-key { min-height: 52px; padding: 4px; border: 0; border-radius: 16px; background: var(--calc-panel-2); color: var(--calc-ink); font: 700 18px var(--font-sans); cursor: pointer; transition: transform .07s, filter .1s; }
.calc-key:active { transform: scale(.94); filter: brightness(1.3); }
.calc-key.operator { background: var(--calc-op); color: #cfe6ff; }
.calc-key.utility { background: var(--calc-fn); color: var(--calc-muted); font-size: 14px; }
.calc-key.danger { background: color-mix(in srgb, var(--calc-danger) 22%, var(--calc-panel-2)); color: #ffd7d7; }

.calc-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.calc-actions .btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; min-height: 50px; margin: 0 !important; padding: 8px !important; border: 1px solid var(--calc-line) !important; border-radius: 14px !important; background: var(--calc-panel-2) !important; color: var(--calc-ink) !important; box-shadow: none !important; font: 800 13px var(--font-sans) !important; cursor: pointer; }
.calc-actions .btn i { font-size: 17px; }
.calc-actions .primary { grid-column: 1 / -1; background: var(--calc-accent) !important; color: var(--calc-accent-ink) !important; border-color: var(--calc-accent) !important; font-size: 15px !important; }

.calc-result { min-height: 96px; padding: 18px; overflow-wrap: anywhere; border-radius: 16px; background: #000; color: #fff; font: 700 clamp(20px, 7vw, 34px)/1.3 var(--font-mono); text-align: right; }
.calc-graph { display: grid; min-height: 220px; place-items: center; overflow: hidden; border: 1px solid var(--calc-line); border-radius: 16px; background: #fff; }
.calc-graph:empty::before { color: #999; content: "Your graph will appear here"; font: 600 13px var(--font-sans); }
.calc-graph svg { display: block; width: 100%; height: auto; }
.calc-stack { display: none; }
.calc-tips { display: none; }

.calc-result-actions { display: flex; gap: 8px; }
.calc-result-actions button { display: inline-flex; min-height: 42px; align-items: center; gap: 6px; padding: 0 14px; border: 1px solid var(--calc-line); border-radius: 12px; background: var(--calc-panel-2); color: var(--calc-ink); font: 800 12px var(--font-sans); cursor: pointer; }

.calc-worksheet-bar { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 8px; }
.calc-label-inline { display: inline-flex; align-items: center; gap: 6px; color: var(--calc-muted); font: 800 11px var(--font-sans); text-transform: uppercase; white-space: nowrap; }
.calc-worksheet-bar .calc-input { min-height: 44px; font-size: 14px; }
.calc-worksheet-bar .btn { min-height: 44px !important; margin: 0 !important; padding: 8px 14px !important; border: 1px solid var(--calc-line) !important; border-radius: 12px !important; background: var(--calc-panel-2) !important; color: var(--calc-ink) !important; box-shadow: none !important; font: 800 12px var(--font-sans) !important; white-space: nowrap; cursor: pointer; }

.calc-history, .calc-worksheets { display: grid; gap: 8px; }
.calc-history-head { display: flex; align-items: center; justify-content: space-between; }
.calc-history-head h3 { margin: 0; font: 800 14px var(--font-sans); }
.calc-history-head > span { color: var(--calc-muted); font: 800 11px var(--font-sans); }
.calc-history-head button { border: 0; background: none; color: var(--calc-muted); font: 700 11px var(--font-sans); text-decoration: underline; cursor: pointer; }
.calc-empty { margin: 0; color: var(--calc-muted); font: 600 12px/1.4 var(--font-sans); }
.calc-empty.hidden { display: none; }
.calc-history-item, .calc-worksheet-item { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; }
.calc-history-restore, .calc-worksheet-open { display: grid; gap: 3px; padding: 11px 12px; border: 1px solid var(--calc-line); border-radius: 12px; background: var(--calc-panel-2); color: var(--calc-ink); text-align: left; cursor: pointer; }
.calc-history-restore { grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 10px; }
.calc-history-restore code, .calc-worksheet-open code { overflow: hidden; color: var(--calc-muted); text-overflow: ellipsis; white-space: nowrap; font: 12px var(--font-mono); }
.calc-history-restore span { color: var(--calc-muted); font: 700 11px var(--font-sans); }
.calc-worksheet-open strong { font: 800 13px var(--font-sans); }
.calc-history-delete, .calc-worksheet-delete { display: grid; width: 42px; place-items: center; border: 1px solid var(--calc-line); border-radius: 12px; background: color-mix(in srgb, var(--calc-danger) 20%, var(--calc-panel-2)); color: #ffd7d7; font-size: 14px; cursor: pointer; }

@media (min-width: 780px) {
  .calc-grid { grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr); align-items: start; }
  .calc-output { position: sticky; top: 80px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }