/* ==========================================================================
   IELTS Master BD — "শব্দ সোপান" design system
   Single hand-written stylesheet. No framework, no CDN, no inline styles —
   the CSP ships with zero unsafe-inline (see Middleware/SecurityHeaders.php).

   Palette: deep navy (trust/authority) + warm coral (energy/friendliness).
   Vocabulary headwords get a serif treatment for a scholarly dictionary
   feel; all other type stays sans for readability, especially Bangla body
   copy — no reliable Bangla serif exists across Windows/Android/iOS, so the
   serif swap is scoped to Latin-script word displays only.
   ========================================================================== */

:root {
  --color-primary: #1E2A54;
  --color-primary-dark: #141B3D;
  --color-primary-light: #3A4B93;
  --color-heading: #141B3D;
  --color-accent: #FF6B4A;
  --color-accent-dark: #E0502F;
  --color-accent-2: #FFB648;
  --color-bg: #FAF8F5;
  --color-surface: #FFFFFF;
  --color-text: #1A1A2E;
  --color-text-muted: #5B5E72;
  --color-border: #E6E2DC;
  --color-error: #C0392B;
  --color-success: #217A47;
  --color-warn: #96620F;

  /* Tints: pale brand-colored backgrounds for badges/chips/banners. The
     matching *-tint-fg pairs a readable foreground for each, since light
     mode wants dark text on a pale chip and dark mode wants the opposite —
     that asymmetry is why these are their own variables, not derived. */
  --color-primary-tint: #E8EAF5;
  --color-primary-tint-fg: #1E2A54;
  --color-accent-tint: #FFEDE5;
  --color-accent-tint-2: #FFDCC2;
  --color-accent-tint-fg: #C2431F;
  --color-success-tint: #E7F5EC;
  --color-error-tint: #FBEAE7;

  --font-bn: "Hind Siliguri", "Noto Sans Bengali", "Segoe UI", sans-serif;
  --font-en: "Inter", "Segoe UI", system-ui, sans-serif;
  --font-heading: Georgia, "Noto Serif", serif;

  --radius-card: 16px;
  --radius-input: 10px;

  --shadow-sm: 0 1px 2px rgba(20, 27, 61, 0.08), 0 1px 1px rgba(20, 27, 61, 0.05);
  --shadow-md: 0 6px 20px rgba(20, 27, 61, 0.12);
  --shadow-lg: 0 16px 44px rgba(20, 27, 61, 0.18);

  --gradient-accent: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-2) 100%);

  --wrap-w: 1120px;
  --transition: 180ms cubic-bezier(.4, 0, .2, 1);
}

:root[data-theme="dark"] {
  --color-bg: #0F1428;
  --color-surface: #161C3C;
  --color-text: #ECEAF5;
  --color-text-muted: #A2A6C4;
  --color-border: #343E7A;
  --color-primary: #5C71C9;
  --color-primary-dark: #4A5AA8;
  --color-primary-light: #7B8DDD;
  --color-heading: #C7CEF0;
  --color-accent: #FF8A68;
  --color-accent-dark: #FF6B4A;
  --color-success: #4CAF74;
  --color-error: #E8776A;
  --color-warn: #E0A73F;
  --color-primary-tint: #1E2650;
  --color-primary-tint-fg: #A9B4EA;
  --color-accent-tint: #3D2A22;
  --color-accent-tint-2: #2A2038;
  --color-accent-tint-fg: #FFB199;
  --color-success-tint: #16321F;
  --color-error-tint: #3A1A16;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.3);
  --shadow-md: 0 6px 20px rgba(0,0,0,.4);
  --shadow-lg: 0 16px 40px rgba(0,0,0,.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #0F1428;
    --color-surface: #161C3C;
    --color-text: #ECEAF5;
    --color-text-muted: #A2A6C4;
    --color-border: #343E7A;
    --color-primary: #5C71C9;
    --color-primary-dark: #4A5AA8;
    --color-primary-light: #7B8DDD;
    --color-heading: #C7CEF0;
    --color-accent: #FF8A68;
    --color-accent-dark: #FF6B4A;
    --color-success: #4CAF74;
    --color-error: #E8776A;
    --color-warn: #E0A73F;
    --color-primary-tint: #1E2650;
    --color-primary-tint-fg: #A9B4EA;
    --color-accent-tint: #3D2A22;
    --color-accent-tint-2: #2A2038;
    --color-accent-tint-fg: #FFB199;
    --color-success-tint: #16321F;
    --color-error-tint: #3A1A16;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.3);
    --shadow-md: 0 6px 20px rgba(0,0,0,.4);
    --shadow-lg: 0 16px 40px rgba(0,0,0,.5);
  }
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-bn);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition), color var(--transition);
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; appearance: none; -webkit-appearance: none; background: none; border: none; margin: 0; color: inherit; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, h4, p { margin: 0 0 .6em; }
:lang(en), .lang-en, .font-en, .mono, code { font-family: var(--font-en); }
strong { font-weight: 600; }
hr { border: none; border-top: 1px solid var(--color-border); margin: 20px 0; }

.wrap { max-width: var(--wrap-w); margin-inline: auto; padding-inline: 20px; }

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 200;
  background: var(--color-primary); color: #fff; padding: 10px 16px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ---- Public header ---- */
.site-header { background: var(--color-surface); border-bottom: 1px solid var(--color-border); position: sticky; top: 0; z-index: 40; transition: box-shadow var(--transition); }
.site-header.is-scrolled { box-shadow: var(--shadow-sm); }
.site-header__inner { display: flex; align-items: center; gap: 24px; height: 68px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--color-heading); }
.logo__mark { flex: none; }
.logo span { font-family: var(--font-heading); letter-spacing: -.01em; }

.nav { display: flex; align-items: center; gap: 18px; margin-inline-start: auto; }
.nav a { font-weight: 600; color: var(--color-text-muted); padding: 6px 2px; border-bottom: 2px solid transparent; transition: color var(--transition), border-color var(--transition); }
.nav a:hover, .nav a[aria-current="page"] { color: var(--color-primary); border-color: var(--color-accent); }
.nav a.btn--primary, .nav a.btn--primary:hover { color: #fff; border-color: transparent; }
.link-muted { color: var(--color-text-muted); font-weight: 600; }

.streak-chip { display: inline-flex; align-items: center; gap: 6px; background: var(--color-accent-tint); color: var(--color-accent-tint-fg); padding: 6px 10px; border-radius: 999px; font-weight: 700; font-size: .85rem; }

.theme-toggle { background: none; border: 1px solid var(--color-border); border-radius: 999px; width: 34px; height: 34px; display: grid; place-items: center; font-size: 1rem; }
.theme-toggle:hover { background: var(--color-border); }

/* ---- Buttons ---- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 22px; border-radius: var(--radius-input); font-weight: 700; border: 1px solid transparent; transition: transform var(--transition), box-shadow var(--transition), background var(--transition), opacity var(--transition); white-space: nowrap; }
.btn:active { transform: translateY(1px); }
.btn[aria-disabled="true"], .btn:disabled { opacity: .55; cursor: not-allowed; transform: none; }
.btn--primary { background: var(--color-primary); color: #fff; box-shadow: var(--shadow-sm); }
.btn--primary:hover { background: var(--color-primary-light); box-shadow: var(--shadow-md); }
.btn--accent { background: var(--gradient-accent); color: #2A1608; box-shadow: var(--shadow-sm); }
.btn--accent:hover { background: var(--color-accent-dark); box-shadow: var(--shadow-md); transform: translateY(-1px); }
.btn--ghost { background: transparent; color: var(--color-heading); border-color: var(--color-border); }
.btn--ghost:hover { background: var(--color-border); }
.btn--sm { padding: 8px 14px; font-size: .85rem; }
.btn--block { width: 100%; }
.btn--lg { padding: 16px 30px; font-size: 1.05rem; }
.btn--stacked { flex-direction: column; gap: 1px; line-height: 1.25; white-space: normal; text-align: center; max-width: 150px; }
.btn--stacked .btn__price { display: none; font-size: .68rem; font-weight: 600; opacity: .9; white-space: normal; }
@media (min-width: 640px) {
  .btn--stacked .btn__price { display: block; }
}
:root[data-theme="dark"] .btn--primary, :root[data-theme="dark"] .btn--ghost { color: var(--color-text); }

/* ---- Notices / flash ---- */
.flash-slot { padding-top: 14px; }
.notice { display: flex; align-items: center; gap: 10px; padding: 12px 16px; border-radius: var(--radius-input); font-weight: 600; margin-bottom: 14px; }
.notice__icon { flex: none; width: 22px; height: 22px; display: grid; place-items: center; border-radius: 50%; font-size: .8rem; background: rgba(0,0,0,.08); }
.notice--success { background: var(--color-success-tint); color: var(--color-success); }
.notice--error { background: var(--color-error-tint); color: var(--color-error); }
.notice--warn { background: var(--color-accent-tint); color: var(--color-warn); }
.notice--info { background: var(--color-primary-tint); color: var(--color-primary-tint-fg); }

/* ---- Layout helpers ---- */
.section { padding-block: 56px; }
.section--tight { padding-block: 32px; }
.section-title { font-size: clamp(1.4rem, 2.5vw, 2rem); font-weight: 800; color: var(--color-heading); }
.section-sub { color: var(--color-text-muted); max-width: 60ch; }
.grid { display: grid; gap: 20px; }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
.stack { display: flex; flex-direction: column; gap: 16px; }
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.text-error { color: var(--color-error); }
.prose p { max-width: 70ch; }
.lede { font-size: 1.05rem; color: var(--color-text-muted); }

/* ---- Cards ---- */
.card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-card); padding: 24px; box-shadow: var(--shadow-sm); transition: box-shadow var(--transition), transform var(--transition); }
.card--hover:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card--accent { border-color: var(--color-accent); }

/* ---- Forms ---- */
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.field label { font-weight: 600; font-size: .9rem; color: var(--color-text-muted); }
.field .input, .input, select.input, textarea.input { font: inherit; padding: 12px 14px; border: 1px solid var(--color-border); border-radius: var(--radius-input); background: var(--color-surface); color: var(--color-text); transition: border-color var(--transition), box-shadow var(--transition); width: 100%; }
.input:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(30, 42, 84, .15); }
.field-hint { font-size: .8rem; color: var(--color-text-muted); }
.field-error, .error-text { font-size: .82rem; color: var(--color-error); font-weight: 600; margin: 2px 0 0; }
.field--error .input { border-color: var(--color-error); }
.input-group, .search-bar { display: flex; gap: 10px; }
.input-group .input, .search-bar .input { flex: 1; }

/* Honeypot: visually hidden but present in the DOM/tab order-excluded, so only a bot filling it triggers the trap. */
.hp-field { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

/* ==========================================================================
   Landing page
   ========================================================================== */
.hero { background: linear-gradient(160deg, var(--color-primary) 0%, var(--color-primary-dark) 100%); color: #F1F2FA; padding-block: 72px; }
.hero__inner { display: grid; gap: 40px; grid-template-columns: 1.1fr .9fr; align-items: center; }
.hero h1 { font-size: clamp(2rem, 4.2vw, 3.1rem); font-weight: 800; }
.hero p { color: #C7CCEE; font-size: 1.05rem; max-width: 52ch; }
.hero__badges { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }
.badge { background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.2); padding: 6px 12px; border-radius: 999px; font-size: .82rem; }
.progress-ring-demo { display: grid; place-items: center; }

.cta-block { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-card); padding: 36px; text-align: center; box-shadow: var(--shadow-md); }
.cta-block h2 { font-size: 1.5rem; color: var(--color-heading); }
.cta-block .meta { color: var(--color-text-muted); font-size: .9rem; margin-top: 10px; }

.feature-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; }
.feature-item { display: flex; gap: 14px; }
.feature-item__icon { flex: none; width: 44px; height: 44px; border-radius: 12px; background: var(--color-primary-tint); color: var(--color-primary); display: grid; place-items: center; font-size: 1.2rem; }
.feature-item h3 { font-size: 1.02rem; margin-bottom: 4px; }
.feature-item p { color: var(--color-text-muted); font-size: .92rem; margin: 0; }

.word-of-day-card { display: flex; flex-direction: column; gap: 10px; }
.word-of-day-card .headword, .headword { font-family: var(--font-heading); font-size: 1.6rem; font-weight: 700; color: var(--color-heading); }
.headword-sm { font-size: 1.2rem; font-weight: 700; margin-top: 8px; }
.headword-md { font-size: 1.4rem; font-weight: 700; margin-top: 8px; }
.ipa { color: var(--color-text-muted); font-family: var(--font-en); }
.band-tag { display: inline-flex; align-items: center; gap: 4px; background: var(--color-primary-tint); color: var(--color-primary-tint-fg); font-size: .75rem; font-weight: 700; padding: 3px 9px; border-radius: 999px; width: fit-content; }
.band-tag--exclusive { background: var(--color-accent-tint); color: var(--color-accent-tint-fg); }

.subscribe-box, .otp-box { background: var(--color-primary-dark); color: #F1F2FA; border-radius: var(--radius-card); padding: 40px; }
.subscribe-box h2, .otp-box h2 { color: #fff; }
.subscribe-box .field label, .otp-box .sub { color: #C3C8E8; }
.subscribe-box .field-hint { color: #9297BE; }
.subscribe-box .lightning, .otp-box .lightning { font-size: 1.6rem; text-align: center; margin: 10px 0; }
.otp-box .input--code { font-size: 1.6rem; text-align: center; letter-spacing: .3em; font-family: var(--font-en); }
.otp-box .center { text-align: center; }
.otp-box .mb-0 { margin-bottom: 0; }
.resend-timer, .help { text-align: center; color: #9297BE; font-size: .85rem; }

/* ==========================================================================
   Progress ring + streak flame
   ========================================================================== */
.progress-ring { position: relative; width: 140px; height: 140px; }
.progress-ring svg { transform: rotate(-90deg); }
.progress-ring circle { fill: none; stroke-width: 10; }
.progress-ring .track { stroke: rgba(255,255,255,.15); }
.progress-ring .fill { stroke: var(--color-accent); stroke-linecap: round; transition: stroke-dashoffset 600ms cubic-bezier(.4,0,.2,1); }
.progress-ring--light .track { stroke: var(--color-border); }
.progress-ring__center { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; }
.progress-ring__flame { font-size: 1.6rem; }
.progress-ring__count { font-weight: 700; font-size: 1.1rem; }
.progress-ring__label { font-size: .72rem; color: var(--color-text-muted); }
.progress-ring--pulse .fill { animation: ring-pulse 900ms ease; }
@keyframes ring-pulse { 0% { filter: drop-shadow(0 0 0 rgba(255,107,74,0)); } 50% { filter: drop-shadow(0 0 10px rgba(255,107,74,.8)); } 100% { filter: drop-shadow(0 0 0 rgba(255,107,74,0)); } }

/* ==========================================================================
   Flashcards
   ========================================================================== */
.flashcard-stage { display: flex; flex-direction: column; align-items: center; gap: 24px; }
.flashcard-scene { perspective: 1400px; width: min(520px, 100%); height: 320px; margin-inline: auto; }
.flashcard { position: relative; width: 100%; height: 100%; transform-style: preserve-3d; transition: transform 500ms cubic-bezier(.4,0,.2,1); cursor: pointer; }
.flashcard.is-flipped { transform: rotateY(180deg); }
.flashcard__face { position: absolute; inset: 0; backface-visibility: hidden; border-radius: var(--radius-card); border: 1px solid var(--color-border); background: var(--color-surface); box-shadow: var(--shadow-md); padding: 32px; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; gap: 12px; }
.flashcard__face--back { transform: rotateY(180deg); background: var(--color-primary-tint); }
.flashcard__headword { font-family: var(--font-heading); font-size: 2rem; font-weight: 700; color: var(--color-heading); }
.flashcard__pos { font-size: .8rem; text-transform: uppercase; letter-spacing: .05em; color: var(--color-text-muted); }
.flashcard__ipa { font-size: .8rem; color: var(--color-text-muted); }
.flashcard__hint { font-size: .82rem; color: var(--color-text-muted); }
.flashcard-actions { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }
.flashcard-progress-text { color: var(--color-text-muted); font-size: .9rem; }

/* ---- Review ---- */
.review-card { display: flex; flex-direction: column; gap: 14px; }
.review-card__word { font-family: var(--font-heading); font-size: 1.5rem; font-weight: 700; }
.review-card.js-review-item { display: none; }
.review-card.js-review-item.is-active { display: flex; }
.rating-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.rating-btn { padding: 12px 8px; border-radius: var(--radius-input); border: 1px solid var(--color-border); background: var(--color-surface); color: var(--color-text); font-weight: 700; text-align: center; transition: var(--transition); }
.rating-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.rating-btn--again { border-color: var(--color-error); color: var(--color-error); }
.rating-btn--hard { border-color: var(--color-warn); color: var(--color-warn); }
.rating-btn--good { border-color: var(--color-primary); color: var(--color-primary); }
.rating-btn--easy { border-color: var(--color-success); color: var(--color-success); }
.rating-btn.is-selected { color: #fff; }
.rating-btn--again.is-selected { background: var(--color-error); }
.rating-btn--hard.is-selected { background: var(--color-warn); }
.rating-btn--good.is-selected { background: var(--color-primary); }
.rating-btn--easy.is-selected { background: var(--color-success); }

/* ---- Quiz ---- */
.quiz-progress { display: flex; align-items: center; gap: 10px; color: var(--color-text-muted); font-size: .9rem; margin-bottom: 18px; }
.quiz-progress__bar { flex: 1; height: 6px; background: var(--color-border); border-radius: 999px; overflow: hidden; }
.quiz-progress__fill { width: 100%; height: 100%; background: var(--color-accent); transform-origin: left; transform: scaleX(0); transition: transform var(--transition); }
.quiz-question { font-size: 1.2rem; font-weight: 600; margin-bottom: 20px; }
.quiz-options { display: grid; gap: 12px; }
.quiz-option { display: flex; align-items: center; gap: 10px; padding: 14px 16px; border: 1px solid var(--color-border); border-radius: var(--radius-input); background: var(--color-surface); color: var(--color-text); text-align: start; transition: var(--transition); width: 100%; }
.quiz-option:hover { border-color: var(--color-primary); transform: translateY(-1px); }
.quiz-option.is-correct { border-color: var(--color-success); background: var(--color-success-tint); color: var(--color-text); }
.quiz-option.is-incorrect { border-color: var(--color-error); background: var(--color-error-tint); color: var(--color-text); }
.quiz-result-banner { padding: 14px 18px; border-radius: var(--radius-input); font-weight: 700; }
.quiz-result-banner--correct { background: var(--color-success-tint); color: var(--color-success); }
.quiz-result-banner--incorrect { background: var(--color-error-tint); color: var(--color-error); }

/* ---- Dashboard ---- */
.stat-tile { text-align: center; }
.stat-tile__value { font-size: 2rem; font-weight: 700; color: var(--color-heading); font-family: var(--font-en); }
.stat-tile__label { color: var(--color-text-muted); font-size: .85rem; }
.bar-chart { display: flex; align-items: flex-end; gap: 8px; height: 120px; }
.bar-chart__col { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 6px; height: 100%; justify-content: flex-end; }
.bar-chart__bar { width: 100%; height: 100%; background: var(--color-primary); border-radius: 6px 6px 0 0; transform-origin: bottom; transform: scaleY(0); transition: transform 500ms ease; }
.bar-chart__label { font-size: .7rem; color: var(--color-text-muted); }
.weak-word-row { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid var(--color-border); }
.weak-word-row:last-child { border-bottom: none; }

/* ---- Collection / Words ---- */
.collection-card { position: relative; overflow: hidden; }
.collection-card::before { content: "★"; position: absolute; top: 12px; inset-inline-end: 14px; color: var(--color-accent); font-size: 1.1rem; }
.word-card__headword { font-family: var(--font-heading); font-size: 1.2rem; font-weight: 700; color: var(--color-heading); margin-top: 8px; }

/* ---- Dictionary / word detail ---- */
.word-detail__headword { font-family: var(--font-heading); font-size: 2.2rem; font-weight: 700; color: var(--color-heading); }
.synonym-list { display: flex; gap: 8px; flex-wrap: wrap; }
.synonym-chip { background: var(--color-primary-tint); padding: 5px 12px; border-radius: 999px; font-size: .82rem; font-family: var(--font-en); }

/* ---- Paywall ---- */
.paywall { text-align: center; padding: 40px 24px; border-radius: var(--radius-card); background: linear-gradient(160deg, var(--color-accent-tint), var(--color-accent-tint-2)); border: 1px solid var(--color-accent); }
.paywall__icon { font-size: 2rem; margin-bottom: 10px; }

/* ---- Guides / chips ---- */
.chip-row { display: flex; gap: 8px; flex-wrap: wrap; }
.chip { padding: 6px 14px; border-radius: 999px; border: 1px solid var(--color-border); font-size: .85rem; font-weight: 600; color: var(--color-text-muted); }
.chip:hover { border-color: var(--color-primary); }
.chip--active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.guide-card h3 { font-size: 1.05rem; }

/* ---- Q&A ---- */
.status-pill { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .03em; }
.status-pill--new { background: var(--color-accent-tint); color: var(--color-warn); }
.status-pill--read { background: var(--color-primary-tint); color: var(--color-primary-tint-fg); }
.status-pill--resolved, .status-pill--answered { background: var(--color-success-tint); color: var(--color-success); }
.answer-block { background: var(--color-primary-tint); border-radius: var(--radius-input); padding: 16px; }

/* ---- Calendar ---- */
.calendar-nav { display: flex; align-items: center; justify-content: space-between; }
.calendar-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 6px; }
.calendar-grid__head { text-align: center; font-size: .75rem; color: var(--color-text-muted); font-weight: 700; padding-bottom: 6px; }
.calendar-cell { aspect-ratio: 1; border: 1px solid var(--color-border); border-radius: 8px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; font-size: .85rem; }
.calendar-cell--empty { border: none; }
.calendar-cell--completed { background: var(--color-accent-tint); border-color: var(--color-accent); }
.calendar-cell--today { outline: 2px solid var(--color-primary); }
.calendar-cell__flame { font-size: .8rem; }

/* ---- Admin ---- */
.data-table { width: 100%; border-collapse: collapse; background: var(--color-surface); border-radius: var(--radius-card); overflow: hidden; box-shadow: var(--shadow-sm); }
.data-table th, .data-table td { padding: 12px 14px; text-align: start; border-bottom: 1px solid var(--color-border); font-size: .92rem; }
.data-table th { background: var(--color-bg); color: var(--color-text-muted); font-weight: 700; }
.alert-row { display: flex; justify-content: space-between; align-items: center; padding: 14px 18px; border-radius: var(--radius-input); background: var(--color-error-tint); color: var(--color-error); font-weight: 600; margin-bottom: 10px; }
.nav-badge { display: inline-block; background: var(--color-error); color: #fff; border-radius: 999px; font-size: .68rem; padding: 1px 6px; margin-inline-start: 4px; }

.admin-shell { display: flex; min-height: 100vh; }
.admin-sidebar { width: 220px; flex: none; background: var(--color-primary-dark); color: #F1F2FA; padding: 20px 14px; display: flex; flex-direction: column; gap: 20px; }
.admin-sidebar__brand { display: flex; align-items: center; gap: 8px; font-weight: 700; padding: 0 6px; }
.admin-sidebar__brand span { font-family: var(--font-heading); }
.admin-sidebar nav { display: flex; flex-direction: column; gap: 2px; }
.admin-sidebar nav a { padding: 10px 10px; border-radius: 8px; color: #C3C8E8; font-weight: 600; font-size: .92rem; }
.admin-sidebar nav a:hover, .admin-sidebar nav a[aria-current="page"] { background: rgba(255,255,255,.08); color: #fff; }
.admin-sidebar__user { margin-top: auto; padding: 10px 6px; border-top: 1px solid rgba(255,255,255,.12); font-size: .85rem; }
.admin-sidebar .btn--ghost { color: #F1F2FA; border-color: rgba(255,255,255,.3); }
.admin-sidebar .btn--ghost:hover { background: rgba(255,255,255,.1); }
.admin-main { flex: 1; padding: 32px; max-width: 1200px; }

/* ---- App shell (gated) ---- */
.app-shell { min-height: 100vh; display: flex; flex-direction: column; }
.app-topbar { background: var(--color-surface); border-bottom: 1px solid var(--color-border); position: sticky; top: 0; z-index: 40; transition: box-shadow var(--transition); }
.app-topbar.is-scrolled { box-shadow: var(--shadow-sm); }
.app-topbar__inner { display: flex; align-items: center; gap: 20px; height: 64px; }
.app-body { flex: 1; display: flex; }
.app-sidebar { width: 220px; flex: none; padding: 20px 12px; border-inline-end: 1px solid var(--color-border); display: none; }
.side-nav { margin-bottom: 20px; }
.group-label { font-size: .72rem; text-transform: uppercase; letter-spacing: .05em; color: var(--color-text-muted); font-weight: 700; padding: 0 10px; margin-bottom: 6px; }
.side-nav a { display: flex; align-items: center; gap: 10px; padding: 9px 10px; border-radius: 8px; color: var(--color-text-muted); font-weight: 600; font-size: .92rem; }
.side-nav a svg { width: 18px; height: 18px; }
.side-nav a:hover, .side-nav a[aria-current="page"] { background: var(--color-primary-tint); color: var(--color-primary-tint-fg); }
.app-main { flex: 1; padding: 24px 20px 90px; max-width: 980px; margin-inline: auto; width: 100%; }

.tabbar { position: fixed; bottom: 0; inset-inline: 0; background: var(--color-surface); border-top: 1px solid var(--color-border); display: flex; z-index: 40; padding-bottom: env(safe-area-inset-bottom); }
.tabbar a { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 3px; padding: 8px 4px 6px; color: var(--color-text-muted); font-size: .68rem; font-weight: 600; }
.tabbar a svg { width: 21px; height: 21px; }
.tabbar a[aria-current="page"] { color: var(--color-primary); }

@media (min-width: 900px) {
  .app-sidebar { display: block; }
  .tabbar { display: none; }
  .app-main { padding-bottom: 24px; }
}

/* ---- Modal (word-unlock celebration) ---- */
.modal-backdrop { position: fixed; inset: 0; background: rgba(20, 27, 61, .6); display: none; align-items: center; justify-content: center; z-index: 200; padding: 20px; }
.modal-backdrop.is-open { display: flex; }
.modal { background: var(--color-surface); border-radius: var(--radius-card); padding: 32px; max-width: 420px; width: 100%; text-align: center; box-shadow: var(--shadow-lg); animation: modal-pop 300ms cubic-bezier(.16, 1, .3, 1); }
@keyframes modal-pop { from { transform: scale(.85); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.celebration { text-align: center; padding: 40px 20px; border-radius: var(--radius-card); background: linear-gradient(160deg, var(--color-accent-tint), var(--color-accent-tint-2)); border: 1px solid var(--color-accent); }
.celebration__word { font-family: var(--font-heading); font-size: 1.8rem; font-weight: 700; color: var(--color-accent-dark); margin: 10px 0; }

/* ---- Toast ---- */
.toast { position: fixed; bottom: 24px; inset-inline-end: 24px; z-index: 100; background: var(--color-primary-dark); color: #fff; padding: 14px 20px; border-radius: var(--radius-input); box-shadow: var(--shadow-lg); transform: translateY(20px); opacity: 0; transition: all var(--transition); max-width: 320px; }
.toast.is-visible { transform: translateY(0); opacity: 1; }

/* ---- Empty states ---- */
.empty-state { text-align: center; padding: 48px 20px; color: var(--color-text-muted); }
.empty-state__icon { font-size: 2.4rem; margin-bottom: 10px; }
.is-hidden { display: none; }

/* ---- Footer ---- */
.site-footer { background: var(--color-primary-dark); color: #C3C8E8; padding-block: 36px; margin-top: 64px; }
.footer__grid { display: flex; flex-direction: column; gap: 10px; align-items: center; text-align: center; }
.footer__links { display: flex; gap: 18px; flex-wrap: wrap; justify-content: center; font-weight: 600; }
.footer__links a:hover { color: #fff; }
.footer__operators { color: #9297BE; font-size: .9rem; }
.footer__copyright { font-size: .85rem; }
.footer__disclaimer { max-width: 70ch; font-size: .78rem; color: #9297BE; margin-top: 6px; }

/* ==========================================================================
   Interactivity — scroll reveal, driven by app.js's IntersectionObserver.
   Falls back to instantly visible if JS never runs or IO is unsupported.
   ========================================================================== */
[data-reveal] { opacity: 0; transform: translateY(18px); transition: opacity 600ms cubic-bezier(.4,0,.2,1), transform 600ms cubic-bezier(.4,0,.2,1); }
[data-reveal].is-revealed { opacity: 1; transform: translateY(0); }

/* ==========================================================================
   Utility classes — spacing, width caps, small one-off tweaks. Every value
   that would normally be an inline style="" attribute lives here instead.
   ========================================================================== */
.mt-6 { margin-top: 6px; } .mt-8 { margin-top: 8px; } .mt-10 { margin-top: 10px; }
.mt-12 { margin-top: 12px; } .mt-14 { margin-top: 14px; } .mt-16 { margin-top: 16px; }
.mt-18 { margin-top: 18px; } .mt-20 { margin-top: 20px; } .mt-24 { margin-top: 24px; } .mt-28 { margin-top: 28px; }
.mb-0 { margin-bottom: 0; } .mb-20 { margin-bottom: 20px; } .mb-24 { margin-bottom: 24px; }
.m-16-auto { margin: 16px auto; }
.mi-auto { margin-inline: auto; }
.max-w-420 { max-width: 420px; } .max-w-440 { max-width: 440px; } .max-w-520 { max-width: 520px; }
.max-w-560 { max-width: 560px; } .max-w-640 { max-width: 640px; }
.d-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.d-actions--between { justify-content: space-between; }
.d-actions--start { justify-content: flex-start; }
.link-primary { color: var(--color-primary); font-weight: 700; }
.link-underline { color: inherit; text-decoration: underline; font-weight: 700; }
.fs-italic { font-style: italic; }
.grid-span-all { grid-column: 1 / -1; }
.w-auto-inline { width: auto; display: inline-block; }
.fs-24 { font-size: 2.4rem; } .fs-22 { font-size: 2.2rem; }
.fs-sm { font-size: .85rem; } .fs-xs { font-size: .78rem; }
.align-center { align-items: center; }
.rounded { border-radius: var(--radius-input); }

/* ---- Reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  [data-reveal] { opacity: 1; transform: none; }
}

/* ---- Responsive ---- */
@media (max-width: 860px) {
  .hero__inner { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .rating-row { grid-template-columns: repeat(2, 1fr); }
  .flashcard-scene { height: 280px; }
  .admin-shell { flex-direction: column; }
  .admin-sidebar { width: auto; flex-direction: row; overflow-x: auto; }
  .admin-sidebar nav { flex-direction: row; }
}
/* The public header's logo + Dictionary/Guides/Login/Subscribe nav doesn't
   fit a narrow phone at the default sizing — this was already tight before
   the header CTA gained a price line, and the smallest common Android
   viewports (~360-390px) tipped it into horizontal scroll. */
@media (max-width: 430px) {
  .wrap { padding-inline: 12px; }
  .site-header__inner { gap: 10px; }
  .logo span { display: none; }
  .nav { gap: 8px; }
  .nav a { font-size: .82rem; padding: 4px 0; }
  .nav .btn { padding: 6px 10px; font-size: .76rem; }
}