/* ===== Private Vault — style.css =====
   Global design tokens + Formula Reference (landing) page styles.
   Mobile-first. No inline styles are used anywhere in the HTML;
   all presentation lives here and in the page-specific stylesheets. */

:root {
  /* ---- Color tokens ---- */
  --ink-950: #0e1420;
  --ink-900: #141b29;
  --ink-850: #182233;
  --ink-line: rgba(237, 231, 218, 0.14);
  --ink-line-strong: rgba(237, 231, 218, 0.26);
  --paper: #ede7da;
  --paper-dim: rgba(237, 231, 218, 0.64);
  --paper-faint: rgba(237, 231, 218, 0.38);
  --gold: #d6a85c;
  --gold-soft: rgba(214, 168, 92, 0.16);
  --gold-strong: #e9c17d;
  --teal: #4fa79e;
  --teal-soft: rgba(79, 167, 158, 0.18);
  --rose: #d9695c;
  --rose-soft: rgba(217, 105, 92, 0.16);

  /* ---- Type tokens ---- */
  --font-display: "Fraunces", "Noto Serif Bengali", "Noto Serif", serif;
  --font-body: "Inter", "Noto Sans Bengali", "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Noto Sans Bengali", ui-monospace, monospace;

  /* ---- Layout tokens ---- */
  --radius-sm: 8px;
  --radius-md: 12px;
  --content-width: 880px;
  --focus-ring: 0 0 0 3px rgba(214, 168, 92, 0.45);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--ink-950);
  color: var(--paper);
  font-family: var(--font-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

img, svg { display: block; max-width: 100%; }

a { color: var(--gold-strong); }

:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-sm);
}

button {
  font-family: inherit;
  cursor: pointer;
}

/* ============================================================
   Formula (landing) page
   ============================================================ */

.formula-page {
  background-image:
    linear-gradient(var(--ink-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--ink-line) 1px, transparent 1px);
  background-size: 32px 32px;
  background-position: center top;
  min-height: 100vh;
}

.formula-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 18px 20px 0;
}

.app-mark {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.pill-button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: 1px solid var(--ink-line-strong);
  color: var(--paper-dim);
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 0.85rem;
  transition: border-color 160ms ease, color 160ms ease, background-color 160ms ease;
}

.pill-button:hover {
  border-color: var(--gold);
  color: var(--paper);
  background: var(--gold-soft);
}

.formula-hero {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 56px 20px 28px;
}

.formula-hero h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2rem, 6vw, 2.9rem);
  line-height: 1.15;
  margin: 0 0 12px;
  max-width: 18ch;
}

.formula-hero p {
  color: var(--paper-dim);
  font-size: 1.02rem;
  max-width: 46ch;
  margin: 0;
}

.formula-grid {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 8px 20px 40px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 620px) {
  .formula-grid { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 960px) {
  .formula-grid { grid-template-columns: 1fr 1fr 1fr; }
}

.formula-card {
  background: var(--ink-900);
  border: 1px solid var(--ink-line);
  border-radius: var(--radius-md);
  padding: 22px 20px;
  text-align: left;
  color: inherit;
  width: 100%;
  transition: border-color 180ms ease, background-color 180ms ease;
  -webkit-tap-highlight-color: transparent;
}

.formula-card:hover {
  border-color: var(--ink-line-strong);
}

.formula-card[aria-expanded="true"] {
  background: var(--ink-850);
  border-color: var(--gold);
}

.formula-card .formula-expr {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.formula-card .formula-tap-hint {
  display: block;
  margin-top: 10px;
  font-size: 0.78rem;
  color: var(--paper-faint);
}

.formula-card .formula-detail {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 220ms ease;
}

.formula-card[aria-expanded="true"] .formula-detail {
  grid-template-rows: 1fr;
}

.formula-card .formula-detail-inner {
  overflow: hidden;
}

.formula-card[aria-expanded="true"] .formula-detail-inner {
  padding-top: 16px;
  margin-top: 16px;
  border-top: 1px solid var(--ink-line);
}

.formula-card .formula-expansion {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: var(--gold-strong);
  margin: 0 0 8px;
}

.formula-card .formula-explain {
  margin: 0;
  font-size: 0.92rem;
  color: var(--paper-dim);
}

/* Easter-egg unlock feedback: a quiet glow + scale, not a flashy reveal.
   Only ever applied to the one card the JS designates, and only after the
   second tap — it never runs on ordinary single taps. */
.formula-card.pv-unlocking {
  animation: pv-unlock 620ms ease forwards;
}

@keyframes pv-unlock {
  0% { box-shadow: 0 0 0 0 var(--teal-soft); border-color: var(--gold); }
  60% { box-shadow: 0 0 0 14px transparent; border-color: var(--teal); }
  100% { box-shadow: 0 0 0 0 transparent; border-color: var(--teal); opacity: 0.55; }
}

/* Formula hint block */
.formula-hint {
  max-width: var(--content-width);
  margin: 8px auto 48px;
  padding: 0 20px;
}

.formula-hint-card {
  border: 1px dashed var(--ink-line-strong);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  color: var(--paper-faint);
}

.formula-hint-card h2 {
  font-family: var(--font-body);
  font-size: 0.95rem;
  margin: 0 0 8px;
  color: var(--paper-dim);
}

.formula-hint-card p {
  margin: 0;
  font-size: 0.86rem;
  white-space: pre-line;
  line-height: 1.7;
}

.formula-footer {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 20px 40px;
  color: var(--paper-faint);
  font-size: 0.8rem;
  text-align: center;
}

/* ============================================================
   Help modal (dialog) — shared component
   ============================================================ */

.pv-dialog-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(6, 9, 15, 0.66);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0;
  z-index: 60;
}

@media (min-width: 620px) {
  .pv-dialog-backdrop {
    align-items: center;
    padding: 20px;
  }
}

.pv-dialog {
  background: var(--ink-900);
  border: 1px solid var(--ink-line-strong);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  max-width: 480px;
  width: 100%;
  padding: 24px 22px 22px;
  color: var(--paper);
}

@media (min-width: 620px) {
  .pv-dialog { border-radius: var(--radius-md); }
}

.pv-dialog h2 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  margin: 0 0 12px;
}

.pv-dialog p {
  color: var(--paper-dim);
  font-size: 0.94rem;
  margin: 0 0 20px;
}

.pv-dialog-actions {
  display: flex;
  justify-content: flex-end;
}

.btn-primary {
  background: var(--gold);
  color: var(--ink-950);
  border: none;
  border-radius: var(--radius-sm);
  padding: 10px 18px;
  font-weight: 600;
  font-size: 0.92rem;
  transition: background-color 160ms ease;
}

.btn-primary:hover { background: var(--gold-strong); }

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-secondary {
  background: transparent;
  color: var(--paper-dim);
  border: 1px solid var(--ink-line-strong);
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  font-weight: 500;
  font-size: 0.88rem;
  transition: border-color 160ms ease, color 160ms ease;
}

.btn-secondary:hover {
  border-color: var(--gold);
  color: var(--paper);
}

/* ============================================================
   Dashboard page
   ============================================================ */

.dashboard-page { min-height: 100vh; }

.dashboard-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 18px 20px 0;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--paper-dim);
  border: 1px solid var(--ink-line);
  border-radius: 999px;
  padding: 6px 12px;
}

.dashboard-main {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 40px 20px 24px;
}

.dashboard-greeting {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 600;
}

.dashboard-username {
  margin: 0 0 32px;
  color: var(--paper-dim);
  font-size: 0.92rem;
}

.nav-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 620px) {
  .nav-grid { grid-template-columns: 1fr 1fr; }
}

.nav-card {
  display: block;
  background: var(--ink-900);
  border: 1px solid var(--ink-line);
  border-radius: var(--radius-md);
  padding: 20px;
  text-decoration: none;
  color: inherit;
  transition: border-color 180ms ease;
}

.nav-card:hover { border-color: var(--gold); }

.nav-card h2 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1.02rem;
  margin: 0 0 6px;
}

.nav-card p {
  margin: 0;
  color: var(--paper-dim);
  font-size: 0.86rem;
}

.nav-card.is-disabled {
  opacity: 0.5;
  pointer-events: none;
}

.nav-card .nav-card-badge {
  display: inline-block;
  margin-top: 10px;
  font-size: 0.74rem;
  color: var(--paper-faint);
  border: 1px solid var(--ink-line);
  border-radius: 999px;
  padding: 3px 9px;
}

.dashboard-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 32px;
}

[hidden] { display: none !important; }

.sr-only {
  position: absolute;
  left: -9999px;
}

/* Shared "pick list" pattern (friend/member pickers, checkbox rows) — used
   by chat.html's new-conversation dialog, chat-room.html's group settings,
   and profile.html's privacy toggles. */
.pick-list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  max-height: 240px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.pick-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--ink-line);
  cursor: pointer;
}

.pick-row:hover { border-color: var(--ink-line-strong); }

.pick-row input[type="checkbox"],
.pick-row input[type="radio"] {
  accent-color: var(--gold);
  width: 16px;
  height: 16px;
}

.pick-row-name { font-size: 0.9rem; }

.new-dialog-empty {
  color: var(--paper-faint);
  font-size: 0.88rem;
  padding: 16px 4px;
  text-align: center;
}

.new-dialog-section-label {
  margin-top: 14px;
}

/* Dashboard topbar actions & notification badge */
.dashboard-topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.status-pill-link {
  text-decoration: none;
  color: var(--paper-dim);
}

.notification-badge {
  display: inline-block;
  background: var(--rose);
  color: #fff;
  border-radius: 999px;
  padding: 0 6px;
  font-size: 0.7rem;
  line-height: 1.4;
  min-width: 1.1rem;
  text-align: center;
}

.notification-badge[hidden] {
  display: none !important;
}