/* ==========================================================================
   Simply Physics — site.css (2026 redesign)
   Palette from the SP logo: teal #2CA89C, navy #1C2549.
   Type: Bricolage Grotesque (display) / Public Sans (body) / IBM Plex Mono (data).
   Signature: the FID signal — a decaying sine wave, drawn in teal.
   ========================================================================== */

:root {
  --teal: #2ca89c;
  --teal-deep: #1e8b81;
  --teal-soft: #e3f3f1;
  --navy: #1c2549;
  --navy-2: #262f57;
  --navy-3: #333d6b;
  --paper: #f5f8f8;
  --card: #ffffff;
  --ink: #212a47;
  --muted: #5b6478;
  --line: #d8dfe4;
  --amber: #e2a93b;
  --amber-deep: #c08c25;
  --danger: #c0392b;

  --font-display: "Bricolage Grotesque", "Public Sans", system-ui, sans-serif;
  --font-body: "Public Sans", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", monospace;

  --wrap: 1120px;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(28, 37, 73, 0.06), 0 8px 24px rgba(28, 37, 73, 0.07);
}

/* ---------- reset-lite ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
}
img { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.12; margin: 0 0 0.5em; color: var(--navy); letter-spacing: -0.01em; }
h1 { font-size: clamp(2rem, 4.5vw, 3.25rem); font-weight: 800; }
h2 { font-size: clamp(1.5rem, 3vw, 2.125rem); font-weight: 700; }
h3 { font-size: 1.25rem; font-weight: 600; }
h4 { font-size: 1.05rem; font-weight: 600; }
p { margin: 0 0 1em; }
a { color: var(--teal-deep); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { padding-left: 1.2em; }
:focus-visible { outline: 3px solid var(--teal); outline-offset: 2px; border-radius: 2px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}

/* ---------- utilities ---------- */
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--teal-deep);
  margin: 0 0 0.9em;
}
.on-dark .eyebrow, .eyebrow.on-dark { color: var(--teal); }
.section { padding: 88px 0; }
.section--tight { padding: 56px 0; }
.fid-divider { display: block; width: 240px; margin: 0 auto; opacity: 0.85; }
.center { text-align: center; }

/* ---------- buttons ---------- */
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.78em 1.5em;
  border-radius: 8px;
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-solid { background: var(--teal); color: #fff; }
.btn-solid:hover { background: var(--teal-deep); color: #fff; }
.btn-ghost { border-color: var(--navy); color: var(--navy); background: transparent; }
.btn-ghost:hover { background: var(--navy); color: #fff; }
.btn-ghost-light { border-color: rgba(255,255,255,0.75); color: #fff; background: transparent; }
.btn-ghost-light:hover { background: rgba(255,255,255,0.12); color: #fff; }
.btn-amber { background: var(--amber); color: var(--navy); }
.btn-amber:hover { background: var(--amber-deep); color: var(--navy); }

/* ---------- header ---------- */
.site-header {
  background: rgba(255,255,255,0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 60;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 72px;
}
.site-logo img { height: 40px; width: auto; }
.site-nav { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.site-nav a {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--navy);
  padding: 8px 12px;
  border-radius: 6px;
}
.site-nav a:hover { background: var(--teal-soft); text-decoration: none; }
.site-nav a.active { color: var(--teal-deep); }
.site-nav .btn { margin-left: 10px; padding: 0.55em 1.2em; }
.site-nav .btn:hover { background: var(--teal-deep); }
.nav-toggle {
  display: none;
  margin-left: auto;
  background: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 11px;
  cursor: pointer;
}
.nav-toggle span { display: block; width: 20px; height: 2px; background: var(--navy); margin: 4px 0; transition: transform 0.2s ease, opacity 0.2s ease; }

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 24px 20px;
    gap: 2px;
    box-shadow: var(--shadow);
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 12px; }
  .site-nav .btn { margin: 10px 0 0; text-align: center; }
  body.nav-open .nav-toggle span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
  body.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
  body.nav-open .nav-toggle span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
}

/* ---------- hero ---------- */
.hero {
  background: var(--navy);
  color: #e8ecf5;
  position: relative;
  overflow: hidden;
}
.hero .wrap { padding-top: 96px; padding-bottom: 40px; position: relative; z-index: 2; }
.hero h1 { color: #fff; max-width: 17em; }
.hero .lede { font-size: 1.15rem; max-width: 36em; color: #c3cbdf; }
.hero .cta-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; margin-top: 28px; }
.hero .cta-aside { font-size: 0.92rem; color: #9aa5c0; }
.hero .cta-aside a { color: var(--teal); font-weight: 600; }
.hero-fid { display: block; width: 100%; height: auto; margin-top: 30px; }
.hero-fid path {
  stroke: var(--teal);
  stroke-width: 2.5;
  fill: none;
  stroke-linecap: round;
}
@media (prefers-reduced-motion: no-preference) {
  .hero-fid path {
    stroke-dasharray: 1500;
    stroke-dashoffset: 1500;
    animation: fid-draw 2.6s cubic-bezier(0.33, 0, 0.2, 1) 0.2s forwards;
  }
  @keyframes fid-draw { to { stroke-dashoffset: 0; } }
}
.hero-grid { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 4fr); gap: 56px; align-items: center; }
.hero-book { justify-self: center; }
.hero-book img {
  max-width: 300px;
  border-radius: 6px;
  transform: rotate(2.5deg);
  box-shadow: 0 18px 24px rgba(9, 13, 30, 0.35), 0 34px 70px rgba(9, 13, 30, 0.45);
  transition: transform 0.25s ease;
}
.hero-book a:hover img { transform: rotate(0.5deg) scale(1.02); }
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero-book img { max-width: 220px; }
}

.page-hero { background: var(--navy); color: #e8ecf5; }
.page-hero .wrap { padding-top: 72px; padding-bottom: 64px; }
.page-hero h1 { color: #fff; margin-bottom: 0.2em; }
.page-hero .lede { font-size: 1.12rem; max-width: 44em; color: #c3cbdf; margin-bottom: 0; }
.page-hero--amber .eyebrow { color: var(--amber); }

/* ---------- stat strip ---------- */
.stat-strip { background: #fff; border-bottom: 1px solid var(--line); }
.stat-strip .wrap {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  padding-top: 34px;
  padding-bottom: 34px;
}
.stat { border-left: 2px solid var(--teal); padding-left: 18px; }
.stat b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  font-weight: 500;
  color: var(--navy);
  line-height: 1.1;
}
.stat span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}
@media (max-width: 720px) {
  .stat-strip .wrap { grid-template-columns: repeat(2, 1fr); row-gap: 24px; }
}

/* ---------- cards / grids ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 34px;
}
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
@media (max-width: 860px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }

.service-card h3 { font-size: 1.45rem; margin-bottom: 0.2em; }
.service-card .sub { color: var(--teal-deep); font-weight: 600; margin-bottom: 0.9em; }
.service-card ul { margin: 0 0 1.4em; padding-left: 1.1em; }
.service-card li { margin-bottom: 0.45em; }
.service-card li::marker { color: var(--teal); }

/* ---------- banners ---------- */
.band-teal { background: var(--teal); color: #fff; }
.band-teal .wrap { padding-top: 44px; padding-bottom: 44px; text-align: center; }
.band-teal .phrases {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.4em 1.6em;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.6vw, 1.7rem);
  font-weight: 700;
}
.band-teal .sub { margin: 10px 0 0; color: #dff4f1; }
.band-navy { background: var(--navy); color: #e8ecf5; }
.band-navy .wrap { padding-top: 56px; padding-bottom: 56px; }
.band-navy h2 { color: #fff; }

.band-grid { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 2fr); gap: 48px; align-items: center; }
.safety-thumbs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; align-self: center; }
.safety-thumbs a {
  display: block;
  border-radius: 8px;
  overflow: hidden;
  border: 2px solid rgba(255, 255, 255, 0.22);
}
.safety-thumbs img { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; transition: transform 0.2s ease; }
.safety-thumbs a:hover img { transform: scale(1.07); }
.safety-thumbs a:hover { border-color: var(--amber); }
@media (max-width: 860px) {
  .band-grid { grid-template-columns: 1fr; gap: 28px; }
}

/* ---------- media rows (image + text) ---------- */
.media-row {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 48px;
  align-items: center;
  padding: 44px 0;
}
.media-row.flip { grid-template-columns: 7fr 5fr; }
.media-row.flip .media-row-img { order: 2; }
.media-row-img img { border-radius: var(--radius); margin: 0 auto; }
.media-row-img.plain img { border-radius: 0; box-shadow: none; }
.media-row h2 { margin-bottom: 0.4em; }
.media-row ul { padding-left: 1.1em; }
.media-row li { margin-bottom: 0.5em; }
.media-row li::marker { color: var(--teal); }
@media (max-width: 860px) {
  .media-row, .media-row.flip { grid-template-columns: 1fr; gap: 20px; padding: 28px 0; }
  .media-row.flip .media-row-img { order: 0; }
  .media-row-img img { max-width: 420px; }
}

/* numbered steps (a real sequence) */
.step { display: flex; gap: 20px; }
.step-num {
  flex: 0 0 auto;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--teal);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  display: flex; align-items: center; justify-content: center;
}
.step h4 { margin-bottom: 0.1em; }
.step p { color: var(--muted); margin-bottom: 0.8em; }

/* ---------- in-page sticky menu (clinical) ---------- */
.page-menu {
  position: sticky;
  top: 72px;
  z-index: 40;
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.page-menu ul {
  list-style: none;
  margin: 0;
  padding: 0 24px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 4px;
}
.page-menu a {
  display: block;
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--navy);
}
.page-menu a:hover { color: var(--teal-deep); text-decoration: none; }
.page-menu a.cta { color: var(--teal-deep); font-weight: 600; }

/* ---------- problem trio ---------- */
.trio { text-align: center; }
.trio img { height: 84px; width: auto; margin: 0 auto 18px; }
.trio h3 { font-size: 1.1rem; }
.trio p { color: var(--muted); font-size: 0.97rem; }

/* ---------- store ---------- */
.store-layout { display: grid; grid-template-columns: 8fr 4fr; gap: 32px; align-items: start; }
@media (max-width: 900px) { .store-layout { grid-template-columns: 1fr; } }
.product {
  display: grid;
  grid-template-columns: 132px 1fr;
  gap: 26px;
  padding: 28px;
}
.product + .product { margin-top: 20px; }
.product img { border: 1px solid var(--line); border-radius: 6px; }
.product h3 { margin-bottom: 0.3em; }
.product .price {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--navy);
  margin: 0.4em 0 1em;
}
.product .price small { color: var(--muted); font-weight: 400; }
@media (max-width: 640px) { .product { grid-template-columns: 1fr; } .product img { max-width: 150px; } }

.cart-panel { position: sticky; top: 92px; padding: 26px; }
.cart-panel h3 { display: flex; justify-content: space-between; align-items: baseline; }
.cart-count { font-family: var(--font-mono); font-size: 0.85rem; color: var(--muted); font-weight: 400; }
.cart-item { border-top: 1px solid var(--line); padding: 14px 0; }
.cart-item h4 { font-family: var(--font-body); font-size: 0.92rem; margin-bottom: 8px; }
.cart-item .qty-row { display: flex; align-items: center; gap: 10px; font-size: 0.9rem; }
.cart-item input[type="number"] {
  width: 58px;
  padding: 6px 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-family: var(--font-mono);
}
.cart-item .remove { color: var(--danger); font-size: 0.85rem; margin-left: auto; }
.cart-total {
  border-top: 2px solid var(--navy);
  margin-top: 8px;
  padding-top: 14px;
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--navy);
}
.cart-panel label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 18px 0 6px;
}
.cart-panel select {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  background: #fff;
}
.cart-panel .btn { width: 100%; margin-top: 16px; text-align: center; }
.cart-note { font-size: 0.82rem; color: var(--muted); margin-top: 12px; }

/* ---------- forms ---------- */
.form-card { max-width: 720px; margin: 0 auto; padding: 40px; }
.form-card label, .field-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--navy);
  margin-bottom: 6px;
}
.form-card input[type="text"],
.form-card input[type="email"],
.form-card select,
.form-card textarea {
  width: 100%;
  padding: 12px 14px;
  margin-bottom: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 1rem;
  background: #fff;
  color: var(--ink);
}
.form-card textarea { resize: vertical; }
.form-card input:focus, .form-card select:focus, .form-card textarea:focus {
  outline: none;
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(44, 168, 156, 0.18);
}
.checks { display: flex; flex-wrap: wrap; gap: 10px 18px; margin-bottom: 22px; }
.checks label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  text-transform: none;
  letter-spacing: 0;
  color: var(--ink);
  margin: 0;
  cursor: pointer;
}
.checks input { accent-color: var(--teal); width: 17px; height: 17px; }
fieldset.checks-set { border: none; margin: 0 0 4px; padding: 0; }
fieldset.checks-set legend {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--navy);
  margin-bottom: 10px;
  padding: 0;
}

/* ---------- galleries (safety) ---------- */
.gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
@media (max-width: 860px) { .gallery { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .gallery { grid-template-columns: 1fr; } }
.gallery figure { margin: 0; }
.gallery a.shot {
  display: block;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #fff;
  position: relative;
}
.gallery a.shot img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; transition: transform 0.25s ease; }
.gallery a.shot:hover img { transform: scale(1.03); }
.gallery a.shot .story-badge {
  position: absolute;
  bottom: 10px; right: 10px;
  background: rgba(28, 37, 73, 0.85);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 4px 9px;
  border-radius: 5px;
}
.gallery figcaption { font-size: 0.88rem; color: var(--muted); padding: 10px 4px 0; }

/* lightbox */
.lb {
  position: fixed;
  inset: 0;
  background: rgba(16, 21, 42, 0.93);
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 32px;
}
.lb.open { display: flex; }
.lb-inner { max-width: 900px; max-height: 100%; overflow: auto; text-align: center; }
.lb-inner img { max-height: 68vh; width: auto; max-width: 100%; margin: 0 auto; border-radius: 8px; }
.lb-caption {
  color: #d6dcec;
  font-size: 0.95rem;
  text-align: left;
  max-width: 700px;
  margin: 18px auto 0;
  white-space: pre-line;
}
.lb-close, .lb-prev, .lb-next {
  position: fixed;
  background: rgba(255,255,255,0.1);
  border: none;
  color: #fff;
  font-size: 1.5rem;
  line-height: 1;
  border-radius: 50%;
  width: 48px; height: 48px;
  cursor: pointer;
}
.lb-close:hover, .lb-prev:hover, .lb-next:hover { background: rgba(255,255,255,0.22); }
.lb-close { top: 20px; right: 20px; }
.lb-prev { left: 16px; top: 50%; transform: translateY(-50%); }
.lb-next { right: 16px; top: 50%; transform: translateY(-50%); }

/* ---------- resource list (home education) ---------- */
.resource-link {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 20px;
  align-items: center;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.resource-link + .resource-link { margin-top: 14px; }
.resource-link:hover { border-color: var(--teal); box-shadow: var(--shadow); text-decoration: none; }
.resource-link img { width: 72px; }
.resource-link h4 { margin-bottom: 0.15em; }
.resource-link p { margin: 0; font-size: 0.92rem; color: var(--muted); }

/* ---------- footer ---------- */
.site-footer { background: var(--navy); color: #aeb7cf; margin-top: 96px; }
.site-footer .wrap {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 40px;
  padding-top: 64px;
  padding-bottom: 40px;
}
.site-footer h4 {
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin-bottom: 1.1em;
}
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 0.55em; font-size: 0.94rem; }
.site-footer a { color: #c9d1e5; }
.site-footer a:hover { color: var(--teal); }
.footer-word {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  color: #fff;
  margin: 0 0 10px;
}
.footer-word span { color: var(--teal); }
.footer-brand p { font-size: 0.94rem; max-width: 26em; }
.footer-fid { width: 200px; opacity: 0.5; margin-top: 20px; }
.footer-bottom { border-top: 1px solid var(--navy-3); }
.footer-bottom .wrap {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 24px;
  font-size: 0.84rem;
  color: #7c87a8;
}
@media (max-width: 860px) {
  .site-footer .wrap { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 560px) {
  .site-footer .wrap { grid-template-columns: 1fr; }
}

/* ---------- misc ---------- */
.paper-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  background: var(--teal-soft);
  border: 1px solid #bfe3de;
  border-radius: var(--radius);
  padding: 26px 30px;
}
.paper-row p { margin: 0; font-weight: 600; color: var(--navy); }
.paper-row small { display: block; font-weight: 400; color: var(--muted); }

.about-photo img { border-radius: var(--radius); box-shadow: var(--shadow); }
.mission-list { counter-reset: mission; list-style: none; margin: 24px 0 0; padding: 0; display: grid; gap: 18px; }
.mission-list li {
  counter-increment: mission;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 26px 22px 74px;
  position: relative;
}
.mission-list li::before {
  content: counter(mission);
  position: absolute;
  left: 24px; top: 22px;
  width: 34px; height: 34px;
  border-radius: 50%;
  background: var(--teal);
  color: #fff;
  font-family: var(--font-mono);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.95rem;
}

.vendor-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 28px; }
@media (max-width: 960px) { .vendor-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 640px) { .vendor-grid { grid-template-columns: repeat(2, 1fr); } }
.vendor h3 { border-bottom: 2px solid var(--teal); padding-bottom: 8px; margin-bottom: 14px; font-size: 1.15rem; }
.vendor ul { list-style: none; margin: 0; padding: 0; }
.vendor li { margin-bottom: 0.6em; }
.vendor a { font-weight: 600; }
.vendor small { color: var(--muted); font-family: var(--font-mono); font-size: 0.78rem; }

.acr-pairs { display: grid; gap: 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.acr-pair .problem {
  background: var(--navy);
  color: #fff;
  padding: 18px 30px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
}
.acr-pair .solution { background: #fff; padding: 24px 30px; }
.acr-pair .solution h3 { margin-bottom: 0.3em; }
.acr-pair .solution p { margin: 0; color: var(--muted); }

.video-card {
  display: flex;
  align-items: center;
  gap: 18px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 24px;
  margin-top: 28px;
}
.video-card img { width: 120px; border-radius: 8px; }

.notice-box {
  background: #fdf6e7;
  border: 1px solid #ecd9a8;
  border-radius: var(--radius);
  padding: 20px 26px;
  font-size: 0.97rem;
}