/* ============================================================
   StudyAI — Django-specific glue for the "ACID" design system.
   Loaded AFTER colors_and_type.css + studyai.css. Holds things the
   React UI kit handled in JS: toasts, Lucide stroke, responsive
   show/hide helpers, prose/MathJax tweaks. Keep design-system
   files (colors_and_type.css, studyai.css) pristine — edit here.
   ============================================================ */

/* Bump the muted text token from #69705F (3.8:1) to #888F7C so meta labels
   (kicker, charcount, footer, plan-note…) clear WCAG AA — 5.9:1 on the page
   bg and 5.2:1 on the surface-2 pill the eyebrow kicker sits on.
   Keeps the warm-green tint; affects all muted small text site-wide. */
.ds { --text-3: #888F7C; }

/* Lucide line icons: 1.6px stroke to match the dark UI */
svg.lucide { stroke-width: 1.6px; }

/* ---------------- Demo/disclaimer banner ----------------
   Makes clear this is a portfolio demo and payments aren't real. */
.demo-banner {
  position: relative; z-index: 60;
  display: flex; align-items: center; justify-content: center; gap: 10px;
  padding: 8px 16px; text-align: center;
  background: var(--warning-wash); border-bottom: 1px solid var(--warning);
  color: var(--warning-text);
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.01em;
}
.demo-banner b { color: var(--text); font-weight: 600; }
.demo-banner .x {
  background: none; border: none; color: inherit; cursor: pointer;
  display: inline-flex; padding: 2px; opacity: 0.7;
}
.demo-banner .x:hover { opacity: 1; }

/* ------------------------------------------------------------
   Anchors-as-components: `.ds a { color: var(--accent-text) }`
   (specificity 0,0,1,1) beats single-class component rules, so an
   <a class="btn-primary"> renders pale-lime text instead of the
   button's own colour. These higher-specificity rules restore the
   component colours for links. Applies wherever a button / menu
   item / chip is an <a> rather than a <button>.
   ------------------------------------------------------------ */
.ds a.btn-primary, .ds a.btn-primary:hover { color: var(--text-inv); }
.ds a.btn-secondary, .ds a.btn-secondary:hover { color: var(--text); }
.ds a.btn-ghost { color: var(--text-2); }
.ds a.btn-ghost:hover { color: var(--text); }
.ds a.menu-item { color: var(--text-2); }
.ds a.menu-item:hover { color: var(--text); }
.ds a.metachip { color: var(--text); }
.ds a.iconbtn { color: var(--text-3); }
.ds a.iconbtn:hover { color: var(--text); }
.ds a.chip { color: var(--text-2); }
.ds a.chip:hover { color: var(--accent-text); }

/* Page scaffold backgrounds (fixed grid + acid halo) live behind everything */
body.ds { position: relative; min-height: 100vh; }

/* ---------------- Toasts (dark) ---------------- */
.toast-container {
  position: fixed; top: 18px; left: 50%; transform: translateX(-50%);
  z-index: 9999; display: flex; flex-direction: column; gap: 8px; pointer-events: none;
}
.toast {
  display: flex; align-items: center; gap: 9px;
  background: var(--surface-2); color: var(--text);
  border: 1px solid var(--line-2); border-radius: var(--r-md);
  padding: 11px 16px; font-size: 14px; font-weight: 500;
  box-shadow: var(--shadow-md); pointer-events: auto;
  animation: slideDownToast 0.3s var(--ease) forwards;
}
@keyframes slideDownToast {
  from { opacity: 0; transform: translateY(-16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---------------- Custom scrollbar (dark) ---------------- */
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: var(--surface-3); border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: var(--line-2); }

/* ---------------- Responsive show/hide helpers (from the kit) ---------------- */
@media (max-width: 640px) {
  .hide-sm { display: none !important; }
  .lang-hide { display: none !important; }
}
@media (max-width: 820px) {
  .user-name-hide { display: none !important; }
}

/* ---------------- Section regenerate loading overlay ---------------- */
.section-loading {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  background: rgba(10,12,10,0.78); backdrop-filter: blur(3px);
  z-index: 5; border-radius: var(--r-lg);
}
.spin { animation: spin 0.9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------------- MathJax / formula colour inside section body ---------------- */
.section-body mjx-container { color: var(--text); }
.section-body pre {
  background: var(--surface-2); border: 1px solid var(--line);
  border-radius: var(--r-md); padding: 14px 16px; overflow-x: auto; margin: 0 0 14px;
}
.section-body pre code { background: transparent; border: none; padding: 0; color: var(--text); }
.section-body a { color: var(--accent-text); }
.section-body a:hover { color: var(--accent-bright); }

/* ---------------- Marketing / info cards (features, contacts) ---------------- */
.mk-grid { display: grid; gap: 16px; }
@media (min-width: 760px) { .mk-grid-3 { grid-template-columns: repeat(3, 1fr); } .mk-grid-2 { grid-template-columns: repeat(2, 1fr); } }
.mk-card {
  display: block; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--r-lg); padding: 26px; transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.mk-card:hover { border-color: var(--accent-line); transform: translateY(-4px); }
.mk-ic {
  width: 52px; height: 52px; border-radius: 13px; background: var(--accent-wash);
  border: 1px solid var(--accent-line); color: var(--accent-text);
  display: grid; place-items: center; margin-bottom: 18px;
}
.mk-card h3 { font-family: var(--font-display); font-weight: 600; font-size: 1.15rem; color: var(--text); margin: 0 0 8px; letter-spacing: -0.01em; }
.mk-card p { margin: 0; color: var(--text-2); font-size: 14.5px; line-height: 1.6; }

/* ---------------- CTA band ---------------- */
.cta-band {
  text-align: center; border-radius: var(--r-xl); padding: 56px 32px;
  background: linear-gradient(180deg, var(--accent-wash), transparent 60%), var(--surface);
  border: 1px solid var(--accent-line); box-shadow: var(--glow);
}

/* ---------------- Legal / prose article ---------------- */
.prose-ds { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 36px; }
.prose-ds h3 { font-family: var(--font-display); font-weight: 600; font-size: 1.15rem; color: var(--text); margin: 26px 0 10px; letter-spacing: -0.01em; }
.prose-ds h3:first-child { margin-top: 0; }
.prose-ds p { color: var(--text-2); line-height: 1.7; margin: 0 0 14px; }
.prose-ds a { color: var(--accent-text); }

/* settings option cards are <label>s — make them block + hide the native radio */
.opt { display: block; }
.opt input[type="radio"] { width: 0; height: 0; }

/* version badge on a regenerated section */
.ver-badge {
  font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  color: var(--text-3); background: var(--surface-2);
  border: 1px solid var(--line); border-radius: var(--r-pill);
  padding: 1px 8px; letter-spacing: 0.02em;
}