/**
 * Chinuch Platform UI v1.0
 *
 * Drop-in stylesheet for custom apps that want to look native to the
 * Chinuch platform. All classes are namespaced with `chi-` so they
 * won't collide with your own styles. Import is automatic — the
 * platform injects `<link rel="stylesheet" href="/chinuch-ui.css">`
 * into every served app page, next to the SDK script.
 *
 * Quick reference:
 *   Layout     .chi-app, .chi-container, .chi-page, .chi-stack, .chi-row
 *   Header     .chi-header, .chi-header-title, .chi-header-sub, .chi-header-actions
 *   Cards      .chi-card, .chi-card-header, .chi-card-title, .chi-card-body, .chi-card-footer
 *   Pills      .chi-pill, .chi-pill--primary, .chi-pill--success, .chi-pill--warn,
 *              .chi-pill--danger, .chi-pill--info, .chi-pill--muted, .chi-pill--ghost
 *   Buttons    .chi-btn, .chi-btn--primary, .chi-btn--ghost, .chi-btn--outline,
 *              .chi-btn--danger, .chi-btn--sm, .chi-btn--lg, .chi-btn--icon
 *   Inputs     .chi-input, .chi-textarea, .chi-select, .chi-label, .chi-field
 *   Tables     .chi-table
 *   Utilities  .chi-muted, .chi-strong, .chi-mono, .chi-divider, .chi-empty,
 *              .chi-spinner
 *
 * Everything is scoped to children of `.chi-app` (or the <body> when
 * unscoped). Dark mode is opt-in via `.chi-app.chi-dark` or the
 * `data-theme="dark"` attribute on any ancestor.
 */

:root {
  /* Platform design tokens — kept in sync with app/globals.css */
  --chi-font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --chi-font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display",
    "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --chi-font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco,
    Consolas, "Liberation Mono", "Courier New", monospace;

  --chi-bg:              #ffffff;
  --chi-bg-subtle:       #f8fafc;
  --chi-bg-muted:        #f1f5f9;
  --chi-surface:         #ffffff;
  --chi-surface-hover:   #f8fafc;
  --chi-border:          #e5e7eb;
  --chi-border-strong:   #d1d5db;
  --chi-divider:         #f1f5f9;

  --chi-text:            #0f172a;
  --chi-text-muted:      #64748b;
  --chi-text-subtle:     #94a3b8;
  --chi-text-inverted:   #ffffff;

  --chi-primary:         #2563eb;
  --chi-primary-hover:   #1d4ed8;
  --chi-primary-soft:    #eff6ff;
  --chi-primary-border:  #bfdbfe;

  --chi-success:         #16a34a;
  --chi-success-soft:    #f0fdf4;
  --chi-success-border:  #bbf7d0;

  --chi-warn:            #d97706;
  --chi-warn-soft:        #fffbeb;
  --chi-warn-border:      #fde68a;

  --chi-danger:          #dc2626;
  --chi-danger-soft:     #fef2f2;
  --chi-danger-border:   #fecaca;

  --chi-info:            #0891b2;
  --chi-info-soft:       #ecfeff;
  --chi-info-border:     #a5f3fc;

  --chi-radius-sm:       6px;
  --chi-radius:          10px;
  --chi-radius-lg:       16px;
  --chi-radius-full:     9999px;

  --chi-shadow-sm:       0 1px 2px rgba(15, 23, 42, 0.04);
  --chi-shadow:          0 1px 3px rgba(15, 23, 42, 0.06),
                         0 1px 2px rgba(15, 23, 42, 0.04);
  --chi-shadow-lg:       0 10px 20px -4px rgba(15, 23, 42, 0.08),
                         0 4px 8px -4px rgba(15, 23, 42, 0.04);

  --chi-gap-xs:          0.25rem;
  --chi-gap-sm:          0.5rem;
  --chi-gap:             0.75rem;
  --chi-gap-md:          1rem;
  --chi-gap-lg:          1.5rem;
  --chi-gap-xl:          2rem;
}

/* Dark mode — automatic if the user's OS prefers dark, or opt-in via
   .chi-dark / data-theme="dark" on any ancestor. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --chi-bg:              #0f172a;
    --chi-bg-subtle:       #111827;
    --chi-bg-muted:        #1e293b;
    --chi-surface:         #111827;
    --chi-surface-hover:   #1e293b;
    --chi-border:          #1f2937;
    --chi-border-strong:   #334155;
    --chi-divider:         #1e293b;
    --chi-text:            #f8fafc;
    --chi-text-muted:      #94a3b8;
    --chi-text-subtle:     #64748b;
    --chi-primary-soft:    #1e3a8a;
    --chi-primary-border:  #1e40af;
    --chi-success-soft:    #052e16;
    --chi-success-border:  #14532d;
    --chi-warn-soft:       #451a03;
    --chi-warn-border:     #78350f;
    --chi-danger-soft:     #450a0a;
    --chi-danger-border:   #7f1d1d;
    --chi-info-soft:       #083344;
    --chi-info-border:     #155e75;
  }
}

.chi-dark,
[data-theme="dark"] {
  --chi-bg:              #0f172a;
  --chi-bg-subtle:       #111827;
  --chi-bg-muted:        #1e293b;
  --chi-surface:         #111827;
  --chi-surface-hover:   #1e293b;
  --chi-border:          #1f2937;
  --chi-border-strong:   #334155;
  --chi-divider:         #1e293b;
  --chi-text:            #f8fafc;
  --chi-text-muted:      #94a3b8;
  --chi-text-subtle:     #64748b;
  --chi-primary-soft:    #1e3a8a;
  --chi-primary-border:  #1e40af;
}

/* ─── Root app shell ─────────────────────────────────────────────── */

.chi-app {
  font-family: var(--chi-font-sans);
  color: var(--chi-text);
  background: var(--chi-bg);
  line-height: 1.5;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

/*
 * Make the `hidden` attribute actually hide things.
 *
 * The UA stylesheet ships `[hidden] { display: none }` without
 * `!important`, so any class that sets `display: flex` / `grid` /
 * `block` will win on specificity and the element stays visible even
 * when `element.hidden = true`. That's how apps end up with their
 * "hidden by default" modal rendered on page load. Forcing the rule
 * here fixes it platform-wide.
 */
[hidden] { display: none !important; }

.chi-app h1, .chi-app h2, .chi-app h3,
.chi-app h4, .chi-app h5, .chi-app h6 {
  font-family: var(--chi-font-display);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--chi-text);
  margin: 0;
}
.chi-app h1 { font-size: 1.5rem; font-weight: 700; letter-spacing: -0.02em; }
.chi-app h2 { font-size: 1.25rem; }
.chi-app h3 { font-size: 1.0625rem; }
.chi-app h4 { font-size: 0.9375rem; color: var(--chi-text-muted); font-weight: 500; text-transform: uppercase; letter-spacing: 0.04em; }
.chi-app p  { margin: 0; color: var(--chi-text); }
.chi-app a  { color: var(--chi-primary); text-decoration: none; }
.chi-app a:hover { text-decoration: underline; }
.chi-app code,
.chi-app pre { font-family: var(--chi-font-mono); }

/* ─── Layout ─────────────────────────────────────────────────────── */

.chi-container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem;
}

.chi-page {
  min-height: 100vh;
  background: var(--chi-bg);
  padding: 1.5rem;
}

.chi-stack      { display: flex; flex-direction: column; gap: var(--chi-gap-md); }
.chi-stack--sm  { display: flex; flex-direction: column; gap: var(--chi-gap-sm); }
.chi-stack--lg  { display: flex; flex-direction: column; gap: var(--chi-gap-lg); }

.chi-row        { display: flex; flex-wrap: wrap; align-items: center; gap: var(--chi-gap); }
.chi-row--tight { display: flex; flex-wrap: wrap; align-items: center; gap: var(--chi-gap-sm); }
.chi-row--between { display: flex; align-items: center; justify-content: space-between; gap: var(--chi-gap); }

.chi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--chi-gap-md);
}

/* ─── Header ─────────────────────────────────────────────────────── */

.chi-header {
  display: flex;
  flex-direction: column;
  gap: var(--chi-gap-sm);
  padding: 0 0 var(--chi-gap-md);
  border-bottom: 1px solid var(--chi-divider);
  margin-bottom: var(--chi-gap-lg);
}
.chi-header--plain { border-bottom: none; margin-bottom: var(--chi-gap-md); padding-bottom: 0; }

.chi-header-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--chi-gap);
}
.chi-header-title {
  font-family: var(--chi-font-display);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--chi-text);
  margin: 0;
}
.chi-header-count {
  margin-left: 0.375rem;
  font-size: 0.8125rem;
  color: var(--chi-text-subtle);
  font-weight: 400;
}
.chi-header-sub {
  font-size: 0.8125rem;
  color: var(--chi-text-muted);
  margin: 0;
}
.chi-header-actions {
  display: flex;
  align-items: center;
  gap: var(--chi-gap-sm);
  flex-wrap: wrap;
}

/* ─── Cards ──────────────────────────────────────────────────────── */

.chi-card {
  background: var(--chi-surface);
  border: 1px solid var(--chi-border);
  border-radius: var(--chi-radius-lg);
  padding: 1.25rem;
  transition: border-color 150ms ease, box-shadow 150ms ease;
}
.chi-card--interactive { cursor: pointer; }
.chi-card--interactive:hover {
  border-color: var(--chi-border-strong);
  box-shadow: var(--chi-shadow);
}
.chi-card--flat { padding: 1rem; }
.chi-card--accent {
  border-left-width: 3px;
  border-left-color: var(--chi-primary);
  border-left-style: solid;
}

.chi-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--chi-gap);
  margin-bottom: var(--chi-gap);
}
.chi-card-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--chi-text);
  letter-spacing: -0.01em;
  margin: 0;
}
.chi-card-sub {
  font-size: 0.75rem;
  color: var(--chi-text-muted);
  margin-top: 2px;
}
.chi-card-body {
  font-size: 0.875rem;
  color: var(--chi-text);
}
.chi-card-footer {
  margin-top: var(--chi-gap-md);
  padding-top: var(--chi-gap);
  border-top: 1px solid var(--chi-divider);
  display: flex;
  align-items: center;
  gap: var(--chi-gap-sm);
}

/* ─── Pills / badges ─────────────────────────────────────────────── */

.chi-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.125rem 0.625rem;
  border-radius: var(--chi-radius-full);
  font-size: 0.6875rem;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: 0.01em;
  border: 1px solid var(--chi-border);
  background: var(--chi-bg-subtle);
  color: var(--chi-text-muted);
  white-space: nowrap;
}
.chi-pill--primary { background: var(--chi-primary-soft); color: var(--chi-primary); border-color: var(--chi-primary-border); }
.chi-pill--success { background: var(--chi-success-soft); color: var(--chi-success); border-color: var(--chi-success-border); }
.chi-pill--warn    { background: var(--chi-warn-soft);    color: var(--chi-warn);    border-color: var(--chi-warn-border); }
.chi-pill--danger  { background: var(--chi-danger-soft);  color: var(--chi-danger);  border-color: var(--chi-danger-border); }
.chi-pill--info    { background: var(--chi-info-soft);    color: var(--chi-info);    border-color: var(--chi-info-border); }
.chi-pill--muted   { background: var(--chi-bg-muted);     color: var(--chi-text-muted); border-color: var(--chi-border); }
.chi-pill--ghost   { background: transparent; border-color: var(--chi-border); color: var(--chi-text-muted); }
.chi-pill--solid   { background: var(--chi-text); color: var(--chi-text-inverted); border-color: var(--chi-text); }

.chi-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: var(--chi-radius-full);
  background: var(--chi-text-subtle);
}
.chi-dot--primary { background: var(--chi-primary); }
.chi-dot--success { background: var(--chi-success); }
.chi-dot--warn    { background: var(--chi-warn); }
.chi-dot--danger  { background: var(--chi-danger); }

/* ─── Buttons ────────────────────────────────────────────────────── */

.chi-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.5rem 0.875rem;
  border-radius: var(--chi-radius-full);
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 500;
  line-height: 1;
  border: 1px solid transparent;
  background: var(--chi-text);
  color: var(--chi-text-inverted);
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease,
    opacity 120ms ease, box-shadow 120ms ease;
  white-space: nowrap;
  user-select: none;
}
.chi-btn:focus-visible { outline: 2px solid var(--chi-primary); outline-offset: 2px; }
.chi-btn:hover:not(:disabled) { background: #1f2937; }
.chi-btn:disabled { opacity: 0.6; cursor: not-allowed; }

.chi-btn--primary { background: var(--chi-primary); color: var(--chi-text-inverted); }
.chi-btn--primary:hover:not(:disabled) { background: var(--chi-primary-hover); }

.chi-btn--outline {
  background: transparent;
  color: var(--chi-text);
  border-color: var(--chi-border-strong);
}
.chi-btn--outline:hover:not(:disabled) {
  background: var(--chi-bg-subtle);
  border-color: var(--chi-text-muted);
}

.chi-btn--ghost {
  background: transparent;
  color: var(--chi-text-muted);
  border-color: transparent;
}
.chi-btn--ghost:hover:not(:disabled) {
  background: var(--chi-bg-subtle);
  color: var(--chi-text);
}

.chi-btn--danger { background: var(--chi-danger); color: var(--chi-text-inverted); }
.chi-btn--danger:hover:not(:disabled) { background: #b91c1c; }

.chi-btn--sm { padding: 0.3125rem 0.625rem; font-size: 0.75rem; }
.chi-btn--lg { padding: 0.6875rem 1.125rem; font-size: 0.875rem; }

.chi-btn--icon {
  padding: 0.4375rem;
  border-radius: var(--chi-radius);
  aspect-ratio: 1;
}

/* ─── Inputs ─────────────────────────────────────────────────────── */

.chi-field {
  display: flex;
  flex-direction: column;
  gap: 0.3125rem;
}
.chi-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--chi-text-muted);
  letter-spacing: 0.01em;
}
.chi-input,
.chi-textarea,
.chi-select {
  width: 100%;
  font-family: inherit;
  font-size: 0.875rem;
  line-height: 1.4;
  color: var(--chi-text);
  background: var(--chi-surface);
  border: 1px solid var(--chi-border);
  border-radius: var(--chi-radius);
  padding: 0.5rem 0.75rem;
  transition: border-color 120ms ease, box-shadow 120ms ease;
  outline: none;
}
.chi-input:focus,
.chi-textarea:focus,
.chi-select:focus {
  border-color: var(--chi-primary);
  box-shadow: 0 0 0 3px var(--chi-primary-soft);
}
.chi-textarea { min-height: 6rem; resize: vertical; }
.chi-input::placeholder,
.chi-textarea::placeholder { color: var(--chi-text-subtle); }

/* ─── Tables ─────────────────────────────────────────────────────── */

.chi-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.8125rem;
}
.chi-table th,
.chi-table td {
  text-align: left;
  padding: 0.625rem 0.75rem;
  border-bottom: 1px solid var(--chi-divider);
}
.chi-table th {
  font-weight: 500;
  color: var(--chi-text-muted);
  text-transform: uppercase;
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
}
.chi-table tbody tr:hover { background: var(--chi-surface-hover); }

/* ─── Utilities ──────────────────────────────────────────────────── */

.chi-muted    { color: var(--chi-text-muted); }
.chi-subtle   { color: var(--chi-text-subtle); }
.chi-strong   { font-weight: 600; color: var(--chi-text); }
.chi-mono     { font-family: var(--chi-font-mono); font-size: 0.8125rem; }
.chi-divider  { height: 1px; background: var(--chi-divider); border: 0; margin: var(--chi-gap-md) 0; }
.chi-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1.5rem;
  text-align: center;
  border: 1px dashed var(--chi-border);
  border-radius: var(--chi-radius-lg);
  color: var(--chi-text-muted);
  gap: 0.25rem;
}
.chi-empty .chi-empty-title {
  color: var(--chi-text);
  font-weight: 600;
  font-size: 0.9375rem;
}

.chi-spinner {
  display: inline-block;
  width: 1rem;
  height: 1rem;
  border-radius: var(--chi-radius-full);
  border: 2px solid var(--chi-border);
  border-top-color: var(--chi-primary);
  animation: chi-spin 600ms linear infinite;
}
@keyframes chi-spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  .chi-app *,
  .chi-app *::before,
  .chi-app *::after { transition: none !important; animation: none !important; }
}
