/*
 * RectaLab · sistema visual de Kreate (estética Notion/Figma).
 * Claro por defecto; oscuro con el sistema o forzado con [data-theme].
 */

/* ============ Fuente: Inter variable, servida desde el propio sitio ============ */
@font-face {
  font-family: 'Inter Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url('/assets/fonts/inter-greek-wght-normal.woff2') format('woff2-variations'),
    url('/assets/fonts/inter-greek-wght-normal.woff2') format('woff2');
  unicode-range: U+0370-0377, U+037A-037F, U+0384-038A, U+038C, U+038E-03A1, U+03A3-03FF;
}
@font-face {
  font-family: 'Inter Variable';
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url('/assets/fonts/inter-latin-wght-normal.woff2') format('woff2-variations'),
    url('/assets/fonts/inter-latin-wght-normal.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308,
    U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* ============ Tokens ============ */
:root {
  color-scheme: light;

  --k-font-sans: 'Inter Variable', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;
  --k-font-mono: ui-monospace, 'SF Mono', 'JetBrains Mono', Menlo, monospace;
  --k-font-math: 'STIX Two Math', 'Cambria Math', 'Latin Modern Math', 'Times New Roman', serif;

  --k-bg: #ffffff;
  --k-bg-subtle: #f7f7f5;
  --k-bg-muted: #efefed;
  --k-bg-hover: rgba(55, 53, 47, 0.06);
  --k-bg-active: rgba(55, 53, 47, 0.1);
  --k-surface: #ffffff;
  --k-surface-selected: #ffffff;

  --k-border: rgba(15, 15, 15, 0.09);
  --k-border-strong: rgba(15, 15, 15, 0.16);

  --k-text: #1f1f1e;
  --k-text-secondary: #5c5b57;
  --k-text-tertiary: #6e6d69;

  --k-primary: #1f1f1e;
  --k-primary-hover: #33332f;
  --k-on-primary: #ffffff;

  --k-tooltip-bg: #1f1f1e;
  --k-tooltip-text: #ffffff;

  --k-accent: #5b5bd6;
  --k-accent-subtle: color-mix(in srgb, var(--k-accent) 10%, transparent);
  --k-selection: color-mix(in srgb, var(--k-accent) 22%, transparent);
  --k-focus-ring: color-mix(in srgb, var(--k-accent) 32%, transparent);

  --k-danger: #c93a3a;
  --k-success: #26805a;

  --k-radius-xs: 4px;
  --k-radius-sm: 6px;
  --k-radius-md: 8px;
  --k-radius-lg: 12px;
  --k-radius-xl: 16px;

  --k-shadow-xs: 0 1px 2px rgba(15, 15, 15, 0.04);
  --k-shadow-sm: 0 1px 2px rgba(15, 15, 15, 0.04), 0 2px 6px rgba(15, 15, 15, 0.04);
  --k-shadow-md: 0 1px 2px rgba(15, 15, 15, 0.04), 0 8px 24px rgba(15, 15, 15, 0.07);

  --k-ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --k-duration-fast: 120ms;
  --k-duration: 200ms;

  --k-topbar-height: 48px;
  --k-sidebar-width: 300px;
  --k-inspector-width: 340px;
  --k-row: 30px;
  --k-control: 32px;
  --k-control-sm: 28px;
  --k-control-xs: 24px;

  /* Rectas: índigo de Kreate y los tonos de Notion. */
  --line-1: #5b5bd6;
  --line-2: #d9730d;
  --line-3: #0f7b6c;
  --line-4: #c14c8a;
  --line-5: #2383e2;

  --plot-bg: #ffffff;
  --plot-grid: rgba(55, 53, 47, 0.09);
  --plot-grid-minor: rgba(55, 53, 47, 0.04);
  --plot-axis: rgba(55, 53, 47, 0.5);
  --axis-x: #d44c47;
  --axis-y: #448361;
  --axis-z: #337ea9;
  --plane: rgba(91, 91, 214, 0.05);
  --plane-edge: rgba(91, 91, 214, 0.3);
  --grid-3d: rgba(55, 53, 47, 0.09);
}

@media (pointer: coarse) {
  :root {
    --k-row: 44px;
    --k-control: 44px;
    --k-control-sm: 44px;
    --k-control-xs: 44px;
  }
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    color-scheme: dark;
    --k-bg: #191919;
    --k-bg-subtle: #1f1f1f;
    --k-bg-muted: #2a2a29;
    --k-bg-hover: rgba(255, 255, 255, 0.055);
    --k-bg-active: rgba(255, 255, 255, 0.09);
    --k-surface: #202020;
    --k-surface-selected: #3a3a39;
    --k-border: rgba(255, 255, 255, 0.08);
    --k-border-strong: rgba(255, 255, 255, 0.15);
    --k-text: #ebebea;
    --k-text-secondary: #aaa8a4;
    --k-text-tertiary: #93928e;
    --k-primary: #ebebea;
    --k-primary-hover: #ffffff;
    --k-on-primary: #191919;
    --k-tooltip-bg: #3a3a39;
    --k-tooltip-text: #f5f5f4;
    --k-accent: #8383f2;
    --k-accent-subtle: color-mix(in srgb, var(--k-accent) 14%, transparent);
    --k-selection: color-mix(in srgb, var(--k-accent) 30%, transparent);
    --k-focus-ring: color-mix(in srgb, var(--k-accent) 40%, transparent);
    --k-danger: #ef6b6b;
    --k-success: #4cc38a;
    --k-shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
    --k-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3), 0 2px 6px rgba(0, 0, 0, 0.2);
    --k-shadow-md: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
    --line-1: #8383f2;
    --line-2: #ffa344;
    --line-3: #4dab9a;
    --line-4: #e255a1;
    --line-5: #529cca;
    --plot-bg: #191919;
    --plot-grid: rgba(255, 255, 255, 0.075);
    --plot-grid-minor: rgba(255, 255, 255, 0.03);
    --plot-axis: rgba(255, 255, 255, 0.45);
    --axis-x: #ff7369;
    --axis-y: #6cc17d;
    --axis-z: #5aa4db;
    --plane: rgba(131, 131, 242, 0.06);
    --plane-edge: rgba(131, 131, 242, 0.3);
    --grid-3d: rgba(255, 255, 255, 0.075);
  }
}

:root[data-theme='dark'] {
  color-scheme: dark;
  --k-bg: #191919;
  --k-bg-subtle: #1f1f1f;
  --k-bg-muted: #2a2a29;
  --k-bg-hover: rgba(255, 255, 255, 0.055);
  --k-bg-active: rgba(255, 255, 255, 0.09);
  --k-surface: #202020;
  --k-surface-selected: #3a3a39;
  --k-border: rgba(255, 255, 255, 0.08);
  --k-border-strong: rgba(255, 255, 255, 0.15);
  --k-text: #ebebea;
  --k-text-secondary: #aaa8a4;
  --k-text-tertiary: #93928e;
  --k-primary: #ebebea;
  --k-primary-hover: #ffffff;
  --k-on-primary: #191919;
  --k-tooltip-bg: #3a3a39;
  --k-tooltip-text: #f5f5f4;
  --k-accent: #8383f2;
  --k-accent-subtle: color-mix(in srgb, var(--k-accent) 14%, transparent);
  --k-selection: color-mix(in srgb, var(--k-accent) 30%, transparent);
  --k-focus-ring: color-mix(in srgb, var(--k-accent) 40%, transparent);
  --k-danger: #ef6b6b;
  --k-success: #4cc38a;
  --k-shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
  --k-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3), 0 2px 6px rgba(0, 0, 0, 0.2);
  --k-shadow-md: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
  --line-1: #8383f2;
  --line-2: #ffa344;
  --line-3: #4dab9a;
  --line-4: #e255a1;
  --line-5: #529cca;
  --plot-bg: #191919;
  --plot-grid: rgba(255, 255, 255, 0.075);
  --plot-grid-minor: rgba(255, 255, 255, 0.03);
  --plot-axis: rgba(255, 255, 255, 0.45);
  --axis-x: #ff7369;
  --axis-y: #6cc17d;
  --axis-z: #5aa4db;
  --plane: rgba(131, 131, 242, 0.06);
  --plane-edge: rgba(131, 131, 242, 0.3);
  --grid-3d: rgba(255, 255, 255, 0.075);
}

/* ============ Base ============ */
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

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

body {
  margin: 0;
  font-family: var(--k-font-sans);
  font-size: 14px;
  line-height: 1.5;
  color: var(--k-text);
  background: var(--k-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-tap-highlight-color: transparent;
  font-feature-settings: 'cv11', 'ss01';
}

h1, h2, h3, p, dl, dd { margin: 0; }

::selection { background: var(--k-selection); }

:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--k-focus-ring);
}

button {
  font: inherit;
  color: inherit;
  cursor: default;
}

.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;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 8px 12px;
  border-radius: var(--k-radius-md);
  background: var(--k-surface);
  color: var(--k-text);
  box-shadow: var(--k-shadow-md);
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  transform: translateY(-200%);
}
.skip-link:focus { transform: none; }

.icon {
  width: 16px;
  height: 16px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.side-scroll, .inspector {
  scrollbar-width: thin;
  scrollbar-color: var(--k-border-strong) transparent;
  overscroll-behavior: contain;
}

/* ============ Botones ============ */
.btn {
  display: inline-flex;
  flex: none;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: var(--k-control);
  padding: 0 12px;
  border: 1px solid transparent;
  border-radius: var(--k-radius-md);
  background: transparent;
  color: var(--k-text-secondary);
  font-size: 13.5px;
  font-weight: 500;
  white-space: nowrap;
  user-select: none;
  transition: background-color var(--k-duration-fast), color var(--k-duration-fast), box-shadow var(--k-duration-fast);
}
.btn:hover { background: var(--k-bg-hover); color: var(--k-text); }
.btn[aria-pressed='true'] { background: var(--k-bg-active); color: var(--k-text); }
.btn:disabled { opacity: 0.45; pointer-events: none; }

.btn-sm { height: var(--k-control-sm); padding: 0 10px; font-size: 13px; }

.btn-primary {
  background: var(--k-primary);
  color: var(--k-on-primary);
  box-shadow: var(--k-shadow-xs);
}
.btn-primary:hover { background: var(--k-primary-hover); color: var(--k-on-primary); }

.btn-icon {
  width: var(--k-control-sm);
  height: var(--k-control-sm);
  padding: 0;
  color: var(--k-text-tertiary);
}
.btn-icon .icon { width: 17px; height: 17px; }
.btn-icon-xs { width: var(--k-control-xs); height: var(--k-control-xs); }
.btn-icon-xs .icon { width: 15px; height: 15px; }

/* Etiquetas flotantes: aparecen bajo el control tras una breve pausa. */
@media (hover: hover) {
  [data-tip] { position: relative; }
  [data-tip]::after {
    content: attr(data-tip);
    position: absolute;
    top: calc(100% + 6px);
    left: 50%;
    z-index: 50;
    padding: 4px 8px;
    border-radius: var(--k-radius-sm);
    background: var(--k-tooltip-bg);
    color: var(--k-tooltip-text);
    box-shadow: var(--k-shadow-md);
    font: 500 12px/18px var(--k-font-sans);
    letter-spacing: normal;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transform: translateX(-50%) scale(0.96);
    transform-origin: top center;
    transition: opacity var(--k-duration-fast) var(--k-ease-out), transform var(--k-duration-fast) var(--k-ease-out);
  }
  [data-tip-align='end']::after { left: auto; right: 0; transform: scale(0.96); transform-origin: top right; }
  [data-tip-align='start']::after { left: 0; transform: scale(0.96); transform-origin: top left; }
  [data-tip]:hover::after {
    opacity: 1;
    transform: translateX(-50%) scale(1);
    transition-delay: 450ms;
  }
  [data-tip-align]:hover::after { transform: scale(1); }
}

/* ============ Estructura ============ */
.app {
  display: grid;
  grid-template-columns: var(--k-sidebar-width) minmax(0, 1fr) var(--k-inspector-width);
  grid-template-rows: var(--k-topbar-height) minmax(0, 1fr);
  grid-template-areas:
    'side top top'
    'side canvas insp';
  height: 100dvh;
  overflow: hidden;
}

/* Barra lateral */
.sidebar {
  grid-area: side;
  display: flex;
  flex-direction: column;
  min-height: 0;
  border-right: 1px solid var(--k-border);
  background: var(--k-bg-subtle);
  padding-top: env(safe-area-inset-top);
}

.brand {
  display: flex;
  flex: none;
  align-items: center;
  gap: 10px;
  height: var(--k-topbar-height);
  padding: 0 10px 0 16px;
}
.brand-logo { width: 22px; height: 22px; border-radius: 6px; }
.brand-name { font-size: 14.5px; font-weight: 600; letter-spacing: -0.01em; }
.brand .btn-icon { margin-left: auto; }

.icon-sun { display: none; }
:root[data-theme='dark'] .icon-sun { display: block; }
:root[data-theme='dark'] .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) .icon-sun { display: block; }
  :root:not([data-theme='light']) .icon-moon { display: none; }
}

.side-scroll {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 6px 12px 20px;
}
.side-section + .side-section { margin-top: 24px; }
.side-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 24px;
  margin-bottom: 6px;
  padding-left: 2px;
}
.side-title { font-size: 12px; font-weight: 500; color: var(--k-text-tertiary); }
.side-foot {
  flex: none;
  padding: 12px 16px max(12px, env(safe-area-inset-bottom));
  border-top: 1px solid var(--k-border);
  color: var(--k-text-tertiary);
  font-size: 12px;
  line-height: 18px;
}

/* Ecuaciones */
.eq-list { display: grid; gap: 10px; }

.c1 { --line: var(--line-1); }
.c2 { --line: var(--line-2); }
.c3 { --line: var(--line-3); }
.c4 { --line: var(--line-4); }
.c5 { --line: var(--line-5); }

.eq { display: grid; gap: 5px; }

.eq-box {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 6px 4px 6px 7px;
  border: 1px solid var(--k-border-strong);
  border-radius: var(--k-radius-md);
  background: var(--k-surface);
  box-shadow: var(--k-shadow-xs);
  cursor: text;
  transition: border-color var(--k-duration-fast), box-shadow var(--k-duration-fast);
}
.eq.is-selected .eq-box {
  border-color: color-mix(in srgb, var(--line) 60%, var(--k-border-strong));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--line) 16%, transparent);
}
.eq.has-error.is-selected .eq-box {
  border-color: color-mix(in srgb, var(--k-danger) 60%, var(--k-border-strong));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--k-danger) 14%, transparent);
}

.eq-name {
  display: grid;
  flex: none;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: var(--k-radius-sm);
  background: color-mix(in srgb, var(--line) 14%, transparent);
  color: var(--line);
  font: italic 600 15px/1 var(--k-font-math);
  user-select: none;
}

.eq-input {
  flex: 1;
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
  outline: 0;
  resize: none;
  background: transparent;
  color: var(--k-text);
  font: 400 14px/22px var(--k-font-sans);
  font-feature-settings: 'cv11', 'ss01', 'tnum';
}
.eq-input:focus-visible { box-shadow: none; }
.eq-input::placeholder { color: var(--k-text-tertiary); }

.eq-remove { margin: -1px 0; opacity: 0; transition: opacity var(--k-duration-fast); }
.eq:hover .eq-remove, .eq-remove:focus-visible { opacity: 1; }

.eq-status {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  min-height: 18px;
  padding: 0 2px;
  color: var(--k-text-tertiary);
  font-size: 12.5px;
  line-height: 18px;
  transition: opacity var(--k-duration);
}
.eq-status .icon { width: 14px; height: 14px; margin-top: 2px; }
.eq-status.is-ok { color: var(--k-text-secondary); }
.eq-status.is-ok .icon { color: var(--k-success); stroke-width: 2.25; }
.eq-status.is-error { color: var(--k-danger); }
.eq-status.is-pending { opacity: 0.45; }

/* Teclado de símbolos */
.keypad {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
  margin-top: 12px;
}
.key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: var(--k-control-sm);
  min-width: var(--k-control-sm);
  padding: 0 7px;
  border: 1px solid transparent;
  border-radius: var(--k-radius-md);
  background: transparent;
  color: var(--k-text-secondary);
  font: 400 15px/1 var(--k-font-math);
  white-space: nowrap;
  user-select: none;
  transition: background-color var(--k-duration-fast), color var(--k-duration-fast);
}
.key:hover { background: var(--k-bg-hover); color: var(--k-text); }
.key-lambda {
  margin-right: 4px;
  padding: 0 10px 0 8px;
  border-color: var(--k-border-strong);
  background: var(--k-surface);
  color: var(--k-text);
  box-shadow: var(--k-shadow-xs);
  font: 500 13px/1 var(--k-font-sans);
}
.key-lambda:hover { background: var(--k-surface); border-color: color-mix(in srgb, var(--k-accent) 45%, var(--k-border-strong)); }
.key-glyph { color: var(--k-accent); font: italic 400 18px/1 var(--k-font-math); }

/* Ejemplos */
.examples { display: grid; }
.example {
  display: flex;
  align-items: center;
  gap: 12px;
  height: var(--k-row);
  margin: 0 -4px;
  padding: 0 8px;
  border: 0;
  border-radius: var(--k-radius-md);
  background: transparent;
  color: var(--k-text-secondary);
  font-size: 13.5px;
  text-align: left;
  transition: background-color var(--k-duration-fast), color var(--k-duration-fast);
}
.example:hover { background: var(--k-bg-hover); color: var(--k-text); }
.example-name { flex: none; }
.example-eq {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  color: var(--k-text-tertiary);
  font-size: 12px;
  font-feature-settings: 'tnum';
  text-align: right;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Barra superior */
.topbar {
  grid-area: top;
  display: flex;
  align-items: center;
  gap: 4px;
  min-width: 0;
  padding: env(safe-area-inset-top) 12px 0;
  border-bottom: 1px solid var(--k-border);
  background: var(--k-bg);
}
.toolbar-sep { width: 1px; height: 18px; margin: 0 6px; background: var(--k-border-strong); }
.topbar-spacer { flex: 1; }
.tools { display: flex; align-items: center; gap: 2px; }

.segmented {
  display: inline-flex;
  padding: 2px;
  border-radius: var(--k-radius-lg);
  background: var(--k-bg-muted);
}
.seg {
  display: inline-flex;
  align-items: center;
  height: calc(var(--k-control) - 4px);
  padding: 0 12px;
  border: 0;
  border-radius: var(--k-radius-md);
  background: transparent;
  color: var(--k-text-secondary);
  font-size: 13px;
  font-weight: 500;
  transition: background-color var(--k-duration-fast), color var(--k-duration-fast), box-shadow var(--k-duration-fast);
}
.seg:hover { color: var(--k-text); }
.seg[aria-pressed='true'] {
  background: var(--k-surface-selected);
  color: var(--k-text);
  box-shadow: var(--k-shadow-sm);
}

.zoom-level {
  min-width: 52px;
  height: var(--k-control-sm);
  padding: 0 6px;
  font-size: 12.5px;
  font-feature-settings: 'tnum';
}

.share-done { display: none; }
#share-link.is-done .share-icon { display: none; }
#share-link.is-done .share-done { display: block; }

/* Lienzo */
.canvas {
  grid-area: canvas;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  background: var(--plot-bg);
}
.stage { position: relative; flex: 1; min-height: 0; }
.stage canvas {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  outline: none;
  touch-action: none;
  cursor: grab;
}
.stage canvas.is-on-line { cursor: crosshair; }
.stage canvas.is-dragging { cursor: grabbing; }
.stage canvas:focus-visible { box-shadow: inset 0 0 0 2px var(--k-focus-ring); }

.statusbar {
  display: flex;
  flex: none;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 28px;
  padding: 0 12px max(0px, env(safe-area-inset-bottom));
  border-top: 1px solid var(--k-border);
  background: var(--k-bg);
  color: var(--k-text-tertiary);
  font-size: 12px;
  font-feature-settings: 'cv11', 'ss01', 'tnum';
  white-space: nowrap;
}
.status-left { min-width: 0; overflow: hidden; text-overflow: ellipsis; }
.status-left b { color: var(--k-text-secondary); font-weight: 500; }
.status-hint { flex: none; }

/* Inspector */
.inspector {
  grid-area: insp;
  min-height: 0;
  overflow-y: auto;
  border-left: 1px solid var(--k-border);
  background: var(--k-bg);
}
.analysis { padding: 20px 20px 32px; }

.insp-eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--k-text-tertiary);
  font-size: 12.5px;
}
.insp-eyebrow .eq-name { width: 20px; height: 20px; font-size: 14px; }
.insp-title {
  margin-top: 12px;
  font-size: 22px;
  font-weight: 600;
  line-height: 28px;
  letter-spacing: -0.02em;
}
.insp-template {
  margin-top: 4px;
  color: var(--k-text-tertiary);
  font: italic 400 15px/1.45 var(--k-font-math);
}
.insp-desc {
  margin-top: 10px;
  color: var(--k-text-secondary);
  font-size: 13.5px;
  line-height: 21px;
}
.insp-note {
  margin-top: 12px;
  padding: 8px 10px;
  border: 1px solid var(--k-border);
  border-radius: var(--k-radius-md);
  background: var(--k-bg-subtle);
  color: var(--k-text-secondary);
  font-size: 12.5px;
  line-height: 19px;
}

.group { margin-top: 28px; }
.group-title {
  margin-bottom: 8px;
  color: var(--k-text-secondary);
  font-size: 13px;
  font-weight: 500;
}

.card {
  overflow: hidden;
  border: 1px solid var(--k-border);
  border-radius: var(--k-radius-lg);
  background: var(--k-surface);
  box-shadow: var(--k-shadow-xs);
}

.prop {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 38px;
  padding: 6px 12px;
}
.prop + .prop { border-top: 1px solid var(--k-border); }
.prop dt { flex: none; color: var(--k-text-secondary); font-size: 13px; }
.prop dd { min-width: 0; overflow-x: auto; font-size: 15px; text-align: right; }
.prop-text { color: var(--k-text-tertiary); font-size: 13px; }

.forms { margin: 0; padding: 0; list-style: none; }
.form { padding: 10px 12px 12px; }
.form + .form { border-top: 1px solid var(--k-border); }
.form.is-yours { background: color-mix(in srgb, var(--k-accent) 4%, var(--k-surface)); }
.form-head { display: flex; align-items: center; gap: 8px; min-height: 24px; }
.form-label { color: var(--k-text-secondary); font-size: 12.5px; font-weight: 500; }
.tag {
  padding: 1px 6px;
  border-radius: var(--k-radius-xs);
  background: var(--k-accent-subtle);
  color: var(--k-accent);
  font-size: 11.5px;
  font-weight: 500;
  line-height: 18px;
}
.form-copy { margin: -2px -4px -2px auto; opacity: 0; transition: opacity var(--k-duration-fast); }
.form:hover .form-copy, .form-copy:focus-visible, .form-copy.is-done { opacity: 1; }
.form-copy.is-done { color: var(--k-success); }
.form-math { margin-top: 6px; overflow-x: auto; font-size: 18px; line-height: 1.5; scrollbar-width: none; }
.form-missing { margin-top: 4px; color: var(--k-text-tertiary); font-size: 13px; }
.form-note { margin-top: 6px; color: var(--k-text-tertiary); font-size: 12px; }

/* Estado vacío: el icono con dos anillos que se desvanecen hacia abajo. */
.empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow: hidden;
  padding: 56px 20px;
  border: 1px solid var(--k-border);
  border-radius: var(--k-radius-xl);
  background: var(--k-bg-subtle);
  text-align: center;
}
.empty-icon {
  position: relative;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--k-border);
  border-radius: var(--k-radius-lg);
  background: var(--k-surface);
  color: var(--k-text-tertiary);
  box-shadow: var(--k-shadow-xs);
}
.empty-icon .icon { width: 20px; height: 20px; stroke-width: 1.6; }
.empty-icon::before,
.empty-icon::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  border: 1px solid var(--k-border);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}
.empty-icon::before {
  width: 92px;
  height: 92px;
  -webkit-mask-image: linear-gradient(to bottom, #000 20%, transparent 75%);
  mask-image: linear-gradient(to bottom, #000 20%, transparent 75%);
}
.empty-icon::after {
  width: 140px;
  height: 140px;
  opacity: 0.6;
  -webkit-mask-image: linear-gradient(to bottom, #000 10%, transparent 60%);
  mask-image: linear-gradient(to bottom, #000 10%, transparent 60%);
}
.empty-title { margin-top: 18px; font-size: 15px; font-weight: 500; }
.empty-text {
  max-width: 280px;
  margin-top: 4px;
  color: var(--k-text-secondary);
  font-size: 13.5px;
  line-height: 21px;
}

/* ============ Tipografía matemática ============ */
.math {
  font-family: var(--k-font-math);
  font-variant-numeric: lining-nums;
  white-space: nowrap;
}
.math var { font-style: italic; }
.math var.vec { position: relative; display: inline-block; }
.math var.vec::before {
  content: '→';
  position: absolute;
  top: -0.62em;
  left: 50%;
  transform: translateX(-45%);
  font-size: 0.62em;
  font-style: normal;
}
.frac {
  display: inline-flex;
  flex-direction: column;
  align-items: stretch;
  margin: 0 0.12em;
  vertical-align: middle;
  font-size: 0.9em;
  line-height: 1.2;
  text-align: center;
}
.frac-num { padding: 0 0.25em 0.06em; border-bottom: 1px solid currentColor; }
.frac-den { padding: 0.06em 0.25em 0; }
.frac .frac { font-size: 0.85em; }
.sys {
  display: inline-flex;
  flex-direction: column;
  gap: 0.1em;
  padding: 0.1em 0 0.1em 0.6em;
  border-left: 1.5px solid currentColor;
  border-radius: 0.6em 0 0 0.6em;
  vertical-align: middle;
}

/* ============ Tamaños intermedios ============ */
@media (max-width: 1279px) {
  :root { --k-sidebar-width: 264px; --k-inspector-width: 296px; }
  .status-hint { display: none; }
}

/* ============ Tableta vertical y móvil: una columna ============ */
@media (max-width: 1023px) {
  .app { display: block; height: auto; overflow: visible; }
  .sidebar { border-right: 0; border-bottom: 1px solid var(--k-border); }
  .side-scroll { overflow: visible; padding: 4px 16px 16px; }
  .side-foot { display: none; }
  .examples {
    display: flex;
    gap: 6px;
    margin: 0 -16px;
    padding: 0 16px 2px;
    overflow-x: auto;
    scrollbar-width: none;
  }
  .example {
    flex: none;
    height: var(--k-control-sm);
    margin: 0;
    padding: 0 12px;
    border: 1px solid var(--k-border-strong);
    border-radius: 999px;
    background: var(--k-surface);
    font-size: 13px;
  }
  .example-eq { display: none; }
  .topbar { height: var(--k-topbar-height); padding-top: 0; }
  .canvas { height: clamp(340px, 64vh, 620px); }
  .inspector { overflow: visible; border-left: 0; border-top: 1px solid var(--k-border); }
  .analysis { padding: 20px 16px 40px; }
  .status-hint { display: inline; }
}

@media (max-width: 560px) {
  .zoom-level, .share-label, .status-hint { display: none !important; }
  #share-link { width: var(--k-control-sm); padding: 0; }
  .toolbar-sep { margin: 0 2px; }
}

/* En pantallas táctiles: el texto a 16px (evita el zoom de iOS) y los controles siempre visibles. */
@media (pointer: coarse) {
  .eq-input { font-size: 16px; line-height: 24px; }
  .eq-box { padding: 9px 4px 9px 9px; }
  .eq-remove, .form-copy { opacity: 1; }
  .eq-remove { margin: -11px -2px -11px 0; }
}

/* Al cambiar de tema no se animan los colores (evita un parpadeo a medias). */
:root[data-theme-switching] *,
:root[data-theme-switching] *::before,
:root[data-theme-switching] *::after {
  transition: none !important;
}

/* ============ Preferencias del sistema ============ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }
}

@media (prefers-contrast: more) {
  :root {
    --k-border: rgba(15, 15, 15, 0.28);
    --k-border-strong: rgba(15, 15, 15, 0.45);
  }
}

@media (forced-colors: active) {
  .eq.is-selected .eq-box, .form.is-yours { outline: 2px solid CanvasText; }
}