/* ─────────────────────────────────────────────────────────────
   RecreateMath  —  assets/style.css
   ───────────────────────────────────────────────────────────── */
:root {
  --white:   #ffffff;
  --off:     #f7f6f3;
  --ink:     #111110;
  --muted:   #888880;
  --accent:  #1a1a1a;
  --teal:    #2d7a6e;
  --teal-lt: #e8f4f2;
  --rule:    #e2e0db;
  --serif:   'Playfair Display', Georgia, serif;
  --sans:    'DM Sans', system-ui, sans-serif;
  --mono:    'DM Mono', 'Courier New', monospace;
  --ease:    cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--sans);
  background: var(--white);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ── MASTHEAD ─────────────────────────────── */
.masthead {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--rule);
  transition: box-shadow .3s var(--ease);
}
.masthead.scrolled { box-shadow: 0 2px 24px rgba(0,0,0,0.06); }
.masthead-inner {
  max-width: 1200px; margin: 0 auto;
  padding: 0 32px;
  height: 64px;
  display: flex; align-items: center; justify-content: space-between;
}
.logo {
  display: flex; align-items: baseline; gap: 6px;
  text-decoration: none; color: var(--ink);
}
.logo-mark { font-family: var(--serif); font-size: 1.35rem; font-weight: 700; letter-spacing: -0.02em; }
.logo-sup {
  font-family: var(--mono); font-size: .6rem; color: var(--ink);
  letter-spacing: .08em; text-transform: uppercase;
  position: relative; top: -.9em; vertical-align: baseline;
}
.nav-links { display: flex; align-items: center; gap: 28px; list-style: none; }
.nav-links a {
  font-size: .8rem; font-weight: 400;
  letter-spacing: .06em; text-transform: uppercase;
  color: var(--muted); text-decoration: none;
  transition: color .2s;
}
.nav-links a:hover { color: var(--ink); }
.nav-muted { color: var(--muted) !important; }
.nav-subscribe {
  font-size: .78rem !important; font-weight: 500 !important;
  letter-spacing: .08em !important;
  color: var(--white) !important;
  background: var(--ink); padding: 8px 20px;
  border-radius: 2px;
  transition: background .2s, color .2s !important;
  cursor: pointer;
}
.nav-subscribe:hover { background: var(--teal) !important; }
.hamburger {
  display: none; flex-direction: column; gap: 5px;
  cursor: pointer; background: none; border: none; padding: 4px;
}
.hamburger span { display: block; width: 22px; height: 1.5px; background: var(--ink); transition: transform .3s; }

/* ── HERO ─────────────────────────────────── */
.hero {
  min-height: 100vh; padding: 64px 0 0;
  display: grid; grid-template-rows: 1fr auto;
  background: var(--white); position: relative; overflow: hidden;
}
.hero-bg-eq {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--serif); font-size: clamp(120px,20vw,280px);
  font-weight: 900; font-style: italic;
  color: rgba(0,0,0,0.028); white-space: nowrap;
  pointer-events: none; user-select: none;
  letter-spacing: -0.04em; line-height: 1;
}
.hero-content {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  text-align: center; padding: 80px 32px 40px;
  position: relative; z-index: 1;
}
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--mono); font-size: .7rem;
  letter-spacing: .18em; text-transform: uppercase; color: var(--teal);
  margin-bottom: 28px; opacity: 0;
  animation: fadeUp .8s var(--ease) .1s forwards;
}
.hero-eyebrow::before, .hero-eyebrow::after {
  content: ''; display: block; width: 32px; height: 1px; background: var(--teal);
}
.hero-title {
  font-family: var(--serif); font-size: clamp(3rem,7vw,7.5rem);
  font-weight: 900; line-height: .92; letter-spacing: -0.04em;
  max-width: 900px; opacity: 0;
  animation: fadeUp .9s var(--ease) .25s forwards;
}
.hero-title em { font-style: italic; color: var(--teal); }
.hero-sub {
  margin-top: 28px; font-size: clamp(1rem,1.6vw,1.2rem); font-weight: 300;
  color: var(--muted); max-width: 540px; line-height: 1.65;
  opacity: 0; animation: fadeUp .9s var(--ease) .4s forwards;
}
.hero-cta-group {
  margin-top: 48px; display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  justify-content: center; opacity: 0;
  animation: fadeUp .9s var(--ease) .55s forwards;
}
.btn-primary-rm {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--sans); font-size: .85rem; font-weight: 500;
  letter-spacing: .05em; text-transform: uppercase;
  text-decoration: none; color: var(--white); background: var(--ink);
  padding: 16px 36px; border-radius: 2px;
  transition: background .25s var(--ease), transform .2s var(--ease);
}
.btn-primary-rm:hover { background: var(--teal); transform: translateY(-2px); }
.btn-primary-rm svg { transition: transform .2s var(--ease); }
.btn-primary-rm:hover svg { transform: translateX(4px); }
.btn-ghost-rm {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .85rem; font-weight: 400; letter-spacing: .03em;
  text-decoration: none; color: var(--muted);
  border-bottom: 1px solid var(--rule); padding-bottom: 2px;
  transition: color .2s, border-color .2s;
  cursor: pointer; background: none; border-top: none; border-left: none; border-right: none;
}
.btn-ghost-rm:hover { color: var(--ink); border-bottom-color: var(--ink); }

/* hero card */
.hero-card-wrap { padding: 0 32px 0; position: relative; z-index: 1; opacity: 0; animation: fadeUp 1s var(--ease) .7s forwards; }
.hero-card {
  max-width: 860px; margin: 0 auto;
  background: var(--off); border: 1px solid var(--rule); border-radius: 4px;
  display: grid; grid-template-columns: 1fr auto;
  overflow: hidden; transition: box-shadow .3s var(--ease);
}
.hero-card:hover { box-shadow: 0 12px 48px rgba(0,0,0,.08); }
.hero-card-body { padding: 36px 40px; }
.hero-card-label { font-family: var(--mono); font-size: .65rem; letter-spacing: .16em; text-transform: uppercase; color: var(--teal); margin-bottom: 12px; }
.hero-card-title { font-family: var(--serif); font-size: clamp(1.25rem,2.5vw,1.75rem); font-weight: 700; line-height: 1.2; letter-spacing: -.02em; margin-bottom: 14px; }
.hero-card-excerpt { font-size: .9rem; color: var(--muted); line-height: 1.7; max-width: 520px; }
.hero-card-meta { margin-top: 20px; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.meta-tag { font-family: var(--mono); font-size: .65rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); border: 1px solid var(--rule); padding: 4px 10px; border-radius: 2px; }
.meta-date { font-size: .75rem; color: var(--muted); }
.hero-card-action {
  padding: 36px 40px; border-left: 1px solid var(--rule);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 12px; min-width: 180px; background: var(--white);
}
.play-btn {
  display: flex; align-items: center; justify-content: center;
  width: 64px; height: 64px; background: var(--ink); border-radius: 50%;
  transition: background .2s, transform .2s var(--ease); cursor: pointer; text-decoration: none;
}
.play-btn:hover { background: var(--teal); transform: scale(1.08); }
.play-label { font-family: var(--mono); font-size: .65rem; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }

/* ticker */
.ticker-bar { border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); background: var(--off); height: 40px; overflow: hidden; display: flex; align-items: center; }
.ticker-track { display: flex; gap: 80px; animation: ticker 28s linear infinite; white-space: nowrap; }
.ticker-item { font-family: var(--mono); font-size: .65rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); display: flex; align-items: center; gap: 8px; }
.ticker-dot { width: 4px; height: 4px; background: var(--teal); border-radius: 50%; flex-shrink: 0; }

/* ── DIVIDERS ─────────────────────────────── */
.section-divider {
  display: flex; align-items: center;
  max-width: 1200px; margin: 0 auto; padding: 0 32px; gap: 20px;
}
.section-divider::before, .section-divider::after { content: ''; flex: 1; height: 1px; background: var(--rule); }
.section-label { font-family: var(--mono); font-size: .65rem; letter-spacing: .16em; text-transform: uppercase; color: var(--muted); white-space: nowrap; }

/* ── PUZZLE SECTION / ARCHIVE ─────────────── */
.puzzle-section { max-width: 1200px; margin: 0 auto; padding: 80px 32px; }
.puzzle-section-header { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 48px; flex-wrap: wrap; gap: 16px; }
.section-title { font-family: var(--serif); font-size: clamp(1.8rem,3vw,2.5rem); font-weight: 700; letter-spacing: -.03em; line-height: 1.1; }
.section-link { font-size: .8rem; letter-spacing: .05em; text-transform: uppercase; color: var(--muted); text-decoration: none; border-bottom: 1px solid var(--rule); padding-bottom: 2px; transition: color .2s, border-color .2s; }
.section-link:hover { color: var(--ink); border-color: var(--ink); }

.puzzle-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 1px; background: var(--rule); border: 1px solid var(--rule); border-radius: 4px; overflow: hidden; }

.puzzle-card {
  background: var(--white); padding: 36px;
  display: flex; flex-direction: column;
  text-decoration: none; color: var(--ink);
  transition: background .2s; cursor: pointer;
  position: relative; overflow: hidden;
}
.puzzle-card::after { content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 3px; background: var(--teal); transform: scaleX(0); transform-origin: left; transition: transform .3s var(--ease); }
.puzzle-card:hover { background: var(--off); }
.puzzle-card:hover::after { transform: scaleX(1); }
.puzzle-card.featured { background: var(--ink); color: var(--white); }
.puzzle-card.featured::after { background: var(--teal); }
.puzzle-card.featured .meta-tag { border-color: rgba(255,255,255,.2); color: rgba(255,255,255,.5); }
.puzzle-card.featured .card-excerpt { color: rgba(255,255,255,.65); }
.puzzle-card.featured .card-date { color: rgba(255,255,255,.4); }
.puzzle-card.featured .card-arrow { color: rgba(255,255,255,.4); }
.puzzle-card.featured:hover { background: #1f1f1d; }
.card-label { font-family: var(--mono); font-size: .62rem; letter-spacing: .15em; text-transform: uppercase; color: var(--teal); margin-bottom: 16px; }
.puzzle-card.featured .card-label { color: #5bc4b5; }
.card-title { font-family: var(--serif); font-size: clamp(1.1rem,1.8vw,1.5rem); font-weight: 700; line-height: 1.2; letter-spacing: -.02em; margin-bottom: 14px; }
.card-excerpt { font-size: .875rem; color: var(--muted); line-height: 1.7; flex: 1; margin-bottom: 24px; }
.card-footer-row { display: flex; align-items: center; justify-content: space-between; margin-top: auto; }
.card-date { font-size: .72rem; color: var(--muted); }
.card-arrow { font-size: 1rem; color: var(--muted); transition: transform .2s var(--ease); }
.puzzle-card:hover .card-arrow { transform: translate(4px,-2px); }

/* Archive grid (all puzzles) */
.archive-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 1px; background: var(--rule); border: 1px solid var(--rule); border-radius: 4px; overflow: hidden; }

/* Filters */
.archive-filters { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 32px; }
.filter-btn {
  font-family: var(--mono); font-size: .62rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--muted); border: 1px solid var(--rule); padding: 6px 14px; border-radius: 2px;
  background: var(--white); cursor: pointer; transition: all .2s; text-decoration: none;
}
.filter-btn:hover, .filter-btn.active { color: var(--white); background: var(--ink); border-color: var(--ink); }

/* ── PUZZLE PAGE ──────────────────────────── */
.puzzle-page { max-width: 720px; margin: 0 auto; padding: 100px 32px 80px; }
.puzzle-page-header { margin-bottom: 48px; }
.puzzle-eyebrow { font-family: var(--mono); font-size: .65rem; letter-spacing: .16em; text-transform: uppercase; color: var(--teal); margin-bottom: 16px; display: flex; align-items: center; gap: 12px; }
.puzzle-page-title { font-family: var(--serif); font-size: clamp(2rem,4vw,3rem); font-weight: 900; letter-spacing: -.04em; line-height: 1.05; margin-bottom: 24px; }
.puzzle-meta-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 32px; }
.diff-badge { display: inline-block; font-family: var(--mono); font-size: .6rem; letter-spacing: .14em; text-transform: uppercase; padding: 5px 12px; border-radius: 2px; }
.diff-Beginner     { background: #e8f4f2; color: var(--teal); }
.diff-Intermediate { background: #fdf3e3; color: #8a5c00; }
.diff-Advanced     { background: #fdecea; color: #8a1a14; }

.puzzle-body { font-size: 1rem; line-height: 1.8; color: var(--ink); }
.puzzle-body h3 { font-family: var(--serif); font-size: 1.3rem; font-weight: 700; margin: 32px 0 12px; letter-spacing: -.02em; }
.puzzle-body p { margin-bottom: 16px; }
.puzzle-body strong { font-weight: 600; }
.puzzle-body em { font-style: italic; }

.hint-box { background: var(--teal-lt); border-left: 3px solid var(--teal); padding: 20px 24px; margin: 32px 0; border-radius: 0 2px 2px 0; }
.hint-box-label { font-family: var(--mono); font-size: .6rem; letter-spacing: .14em; text-transform: uppercase; color: var(--teal); margin-bottom: 8px; }
.hint-box p { font-size: .9rem; color: var(--ink); line-height: 1.7; margin: 0; }

.solution-box { background: var(--off); border: 1px solid var(--rule); padding: 28px; border-radius: 4px; margin: 32px 0; }
.solution-toggle { font-family: var(--sans); font-size: .85rem; font-weight: 500; letter-spacing: .04em; background: none; border: 1px solid var(--rule); border-radius: 2px; padding: 10px 20px; cursor: pointer; color: var(--ink); transition: all .2s; }
.solution-toggle:hover { background: var(--ink); color: var(--white); border-color: var(--ink); }
.solution-content { display: none; margin-top: 20px; font-size: .9rem; line-height: 1.75; color: var(--ink); }
.solution-content.open { display: block; }

.puzzle-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 48px; padding-top: 32px; border-top: 1px solid var(--rule); }

/* Timer */
.puzzle-timer { display: inline-flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: .75rem; letter-spacing: .08em; color: var(--muted); }
.timer-value { font-size: 1rem; color: var(--ink); font-weight: 400; }

/* ── FORMULA STRIP ────────────────────────── */
.formula-strip { background: var(--off); border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); padding: 48px 32px; }
.formula-strip-inner { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: repeat(4,1fr); gap: 1px; background: var(--rule); border: 1px solid var(--rule); border-radius: 4px; overflow: hidden; }
.formula-tile { background: var(--white); padding: 32px 28px; text-align: center; }
.formula-eq { font-family: var(--serif); font-size: 1.6rem; font-weight: 400; font-style: italic; color: var(--ink); margin-bottom: 10px; line-height: 1.3; }
.formula-desc { font-family: var(--mono); font-size: .62rem; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }

/* ── ABOUT ────────────────────────────────── */
.about-strip { max-width: 1200px; margin: 0 auto; padding: 80px 32px; display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.about-number { font-family: var(--serif); font-size: clamp(4rem,10vw,9rem); font-weight: 900; font-style: italic; line-height: 1; color: rgba(0,0,0,.06); margin-bottom: -20px; }
.about-title { font-family: var(--serif); font-size: clamp(1.6rem,2.5vw,2.2rem); font-weight: 700; letter-spacing: -.03em; line-height: 1.2; margin-bottom: 20px; }
.about-body { font-size: .95rem; color: var(--muted); line-height: 1.8; }
.about-body p + p { margin-top: 16px; }
.about-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--rule); border: 1px solid var(--rule); border-radius: 4px; overflow: hidden; }
.stat-tile { background: var(--white); padding: 28px 24px; }
.stat-number { font-family: var(--serif); font-size: 2.5rem; font-weight: 700; letter-spacing: -.04em; line-height: 1; margin-bottom: 8px; }
.stat-label { font-family: var(--mono); font-size: .65rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }

/* ── NEWSLETTER ───────────────────────────── */
.newsletter-section { background: var(--ink); padding: 80px 32px; }
.newsletter-inner { max-width: 680px; margin: 0 auto; text-align: center; }
.newsletter-title { font-family: var(--serif); font-size: clamp(2rem,4vw,3.2rem); font-weight: 700; font-style: italic; color: var(--white); letter-spacing: -.03em; margin-bottom: 16px; }
.newsletter-sub { font-size: .9rem; color: rgba(255,255,255,.55); line-height: 1.7; margin-bottom: 40px; }
.newsletter-form { display: flex; max-width: 440px; margin: 0 auto; }
.newsletter-input { flex: 1; font-family: var(--sans); font-size: .875rem; background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.15); border-right: none; color: var(--white); padding: 14px 20px; border-radius: 2px 0 0 2px; outline: none; transition: background .2s, border-color .2s; }
.newsletter-input::placeholder { color: rgba(255,255,255,.3); }
.newsletter-input:focus { background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.3); }
.newsletter-btn { font-family: var(--sans); font-size: .8rem; font-weight: 500; letter-spacing: .08em; text-transform: uppercase; color: var(--ink); background: var(--white); border: 1px solid var(--white); padding: 14px 24px; border-radius: 0 2px 2px 0; cursor: pointer; transition: background .2s, color .2s; white-space: nowrap; }
.newsletter-btn:hover { background: var(--teal); border-color: var(--teal); color: var(--white); }
.newsletter-note { margin-top: 16px; font-size: .72rem; color: rgba(255,255,255,.3); letter-spacing: .04em; }

/* ── FEEDBACK PAGE ────────────────────────── */
.feedback-page { max-width: 640px; margin: 0 auto; padding: 100px 32px 80px; }
.page-title { font-family: var(--serif); font-size: clamp(2rem,4vw,2.8rem); font-weight: 900; letter-spacing: -.04em; line-height: 1.05; margin-bottom: 12px; }
.page-sub { font-size: .95rem; color: var(--muted); line-height: 1.7; margin-bottom: 40px; }

/* ── FORM ELEMENTS ────────────────────────── */
.form-field { margin-bottom: 20px; }
.form-field label { display: block; font-size: .72rem; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
.form-field input,
.form-field textarea,
.form-select {
  width: 100%; font-family: var(--sans); font-size: .9rem;
  border: 1px solid var(--rule); border-radius: 2px; padding: 12px 16px;
  background: var(--white); color: var(--ink); outline: none;
  transition: border-color .2s;
}
.form-field input:focus, .form-field textarea:focus, .form-select:focus { border-color: var(--ink); }
.form-check { display: flex; align-items: flex-start; gap: 10px; margin-bottom: 24px; }
.form-check input[type="checkbox"] { margin-top: 2px; flex-shrink: 0; accent-color: var(--teal); }
.form-check label { font-size: .78rem; color: var(--muted); line-height: 1.5; }
.form-check a { color: var(--ink); }

/* Star rating */
.star-row { display: flex; gap: 4px; margin-top: 6px; }
.star-btn { background: none; border: none; cursor: pointer; font-size: 1.5rem; color: var(--rule); transition: color .15s; padding: 0; line-height: 1; }
.star-btn.lit { color: #e8a030; }

/* Alerts */
.alert { padding: 14px 20px; border-radius: 2px; font-size: .875rem; margin-bottom: 24px; }
.alert-success { background: var(--teal-lt); color: var(--teal); border: 1px solid #b3ddd7; }
.alert-error   { background: #fdecea; color: #8a1a14; border: 1px solid #f4b8b4; }
.alert-info    { background: #f0f4ff; color: #2040a0; border: 1px solid #b4c8f4; }

/* ── MODAL ────────────────────────────────── */
.modal-overlay {
  display: none; position: fixed; inset: 0; z-index: 200;
  background: rgba(0,0,0,.5); backdrop-filter: blur(4px);
  align-items: center; justify-content: center;
}
.modal-overlay.open { display: flex; }
.modal-box {
  background: var(--white); border-radius: 4px;
  max-width: 440px; width: 90%; padding: 48px;
  position: relative; animation: modalIn .4s var(--ease);
  max-height: 90vh; overflow-y: auto;
}
@keyframes modalIn {
  from { opacity: 0; transform: translateY(20px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
.modal-close { position: absolute; top: 20px; right: 20px; background: none; border: none; cursor: pointer; font-size: 1.2rem; color: var(--muted); line-height: 1; transition: color .2s; }
.modal-close:hover { color: var(--ink); }
.modal-label { font-family: var(--mono); font-size: .65rem; letter-spacing: .16em; text-transform: uppercase; color: var(--teal); margin-bottom: 12px; }
.modal-title { font-family: var(--serif); font-size: 1.8rem; font-weight: 700; letter-spacing: -.03em; margin-bottom: 24px; }
.modal-submit { width: 100%; font-family: var(--sans); font-size: .85rem; font-weight: 500; letter-spacing: .08em; text-transform: uppercase; color: var(--white); background: var(--ink); border: none; border-radius: 2px; padding: 14px; cursor: pointer; transition: background .2s; }
.modal-submit:hover { background: var(--teal); }

/* ── NOTICE PAGE (confirm / error / etc.) ─── */
.notice-page { max-width: 560px; margin: 0 auto; padding: 140px 32px 80px; text-align: center; }
.notice-icon { font-size: 3rem; margin-bottom: 24px; line-height: 1; }
.notice-title { font-family: var(--serif); font-size: clamp(1.8rem,3vw,2.4rem); font-weight: 700; letter-spacing: -.04em; margin-bottom: 16px; }
.notice-body { font-size: .95rem; color: var(--muted); line-height: 1.75; margin-bottom: 32px; }

/* ── FOOTER ───────────────────────────────── */
footer { background: var(--off); border-top: 1px solid var(--rule); padding: 40px 32px; }
.footer-inner { max-width: 1200px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 20px; }
.footer-logo { font-family: var(--serif); font-size: 1.1rem; font-weight: 700; color: var(--ink); text-decoration: none; }
.footer-links { display: flex; gap: 24px; list-style: none; flex-wrap: wrap; }
.footer-links a { font-size: .75rem; letter-spacing: .05em; text-transform: uppercase; color: var(--muted); text-decoration: none; transition: color .2s; }
.footer-links a:hover { color: var(--ink); }
.footer-copy { font-size: .72rem; color: var(--muted); }

/* ── ANIMATIONS ───────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes ticker {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ── RESPONSIVE ───────────────────────────── */
@media (max-width: 960px) {
  .puzzle-grid, .archive-grid { grid-template-columns: 1fr 1fr; }
  .formula-strip-inner { grid-template-columns: 1fr 1fr; }
  .about-strip { grid-template-columns: 1fr; gap: 40px; }
  .hero-card { grid-template-columns: 1fr; }
  .hero-card-action { border-left: none; border-top: 1px solid var(--rule); flex-direction: row; justify-content: flex-start; padding: 24px 36px; }
  .nav-links { display: none; }
  .nav-links.open { display: flex; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: var(--white); border-bottom: 1px solid var(--rule); padding: 20px 32px 24px; gap: 16px; }
  .hamburger { display: flex; }
}
@media (max-width: 640px) {
  .puzzle-grid, .archive-grid { grid-template-columns: 1fr; }
  .formula-strip-inner { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: 1fr 1fr; }
  .newsletter-form { flex-direction: column; }
  .newsletter-input { border-right: 1px solid rgba(255,255,255,.15); border-bottom: none; border-radius: 2px 2px 0 0; }
  .newsletter-btn { border-radius: 0 0 2px 2px; }
  .footer-inner { flex-direction: column; text-align: center; }
  .footer-links { flex-wrap: wrap; justify-content: center; }
}


/* ── Hint toggle ─────────────────────────────────────────────── */
#hintContent {
  display: none;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
  margin-top: 0;
  border-top: none;
}
#hintContent.open { display: block; }