/* ============================================================================
   Math Class 678 — mathclass678.com
   Design system. Authored by Claude. Regenerated each session; do not hand-edit dist/.
   Brand tokens are LOCKED (see Project Instructions). NEVER PURPLE.
   ============================================================================ */

/* ---- Fonts: Fraunces (display, scholarly w/ character) + Inter (body) +
        IBM Plex Mono (CCSS codes — data/utility face, true to the subject) ---- */

:root {
  /* Brand constants — locked */
  --forest:        #1A3C34;
  --forest-deep:   #112a24;
  --forest-soft:   #245046;
  --gold:          #D4A017;
  --gold-soft:     #e6be4f;
  --offwhite:      #F7F5F0;
  --offwhite-warm: #f0ece2;
  --charcoal:      #2C2C2C;
  --charcoal-soft: #5A5A5A;
  --line:          #e2ddd2;
  --white:         #ffffff;

  /* Grade accents */
  --teal:  #3FA9A2;  /* 6th */
  --coral: #D85D5D;  /* 7th */
  --navy:  #2A4A7F;  /* 8th */
  --teal-tint:  #eaf5f4;
  --coral-tint: #fbeded;
  --navy-tint:  #e9edf5;
  --navy-tint2: #e9edf5;

  /* Type */
  --display: "Fraunces", Georgia, "Times New Roman", serif;
  --body:    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono:    "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* Type scale (fluid) */
  --fs-hero:   clamp(2.6rem, 1.6rem + 4.4vw, 5.2rem);
  --fs-h1:     clamp(2.1rem, 1.5rem + 2.6vw, 3.4rem);
  --fs-h2:     clamp(1.6rem, 1.25rem + 1.5vw, 2.3rem);
  --fs-h3:     clamp(1.2rem, 1.05rem + 0.7vw, 1.5rem);
  --fs-lead:   clamp(1.05rem, 0.98rem + 0.5vw, 1.3rem);
  --fs-body:   1rem;
  --fs-sm:     0.875rem;
  --fs-xs:     0.78rem;

  /* Space scale */
  --s-1: 0.25rem; --s-2: 0.5rem;  --s-3: 0.75rem; --s-4: 1rem;
  --s-5: 1.5rem;  --s-6: 2rem;    --s-7: 3rem;    --s-8: 4rem;
  --s-9: 6rem;    --s-10: 8rem;

  --maxw: 1200px;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow-sm: 0 1px 2px rgba(26,60,52,.06), 0 2px 8px rgba(26,60,52,.05);
  --shadow:    0 4px 14px rgba(26,60,52,.09), 0 10px 30px rgba(26,60,52,.07);
  --shadow-lg: 0 12px 40px rgba(26,60,52,.16);
  --ease: cubic-bezier(.2,.7,.2,1);
}

/* ---- Reset / base ---- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}
body {
  font-family: var(--body);
  font-size: var(--fs-body);
  line-height: 1.65;
  color: var(--charcoal);
  background: var(--offwhite);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
ul { list-style: none; padding: 0; }

h1,h2,h3,h4 { font-family: var(--display); font-weight: 600; line-height: 1.08; letter-spacing: -0.01em; color: var(--forest); font-optical-sizing: auto; }

/* ---- Layout helpers ---- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: clamp(1.1rem, 4vw, 2.5rem); }
.section { padding-block: clamp(3.5rem, 7vw, 6.5rem); }
.eyebrow {
  font-family: var(--mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 500;
  display: inline-flex; align-items: center; gap: .55rem;
}
.eyebrow::before { content:""; width: 22px; height: 1.5px; background: var(--gold); display:inline-block; }
.skip-link { position:absolute; left:-9999px; top:0; background:var(--forest); color:#fff; padding:.7rem 1.1rem; z-index:200; border-radius:0 0 8px 0; }
.skip-link:focus { left:0; }

/* ---- Focus visibility (a11y) ---- */
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ============================================================================
   NAV
   ============================================================================ */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(247,245,240,.82);
  backdrop-filter: saturate(140%) blur(12px);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease), background .3s var(--ease);
}
.nav.scrolled { border-bottom-color: var(--line); background: rgba(247,245,240,.94); }
.nav__inner { display:flex; align-items:center; justify-content:space-between; gap:1rem; padding-block: .85rem; }
.brand { display:flex; align-items:center; gap:.6rem; }
.brand__mark { width: 34px; height: 34px; flex:none; }
.brand__text { display:flex; flex-direction:column; line-height:1; }
.brand__name { font-family: var(--display); font-weight:600; font-size:1.12rem; color:var(--forest); letter-spacing:-.01em; }
.brand__sub  { font-family: var(--mono); font-size:.6rem; letter-spacing:.12em; text-transform:uppercase; color:var(--charcoal-soft); margin-top:3px; }
.nav__links { display:flex; align-items:center; gap:.35rem; }
.nav__link { padding:.5rem .85rem; border-radius:8px; font-size:.92rem; font-weight:500; color:var(--charcoal); transition: background .2s var(--ease), color .2s var(--ease); }
.nav__link:hover { background: var(--offwhite-warm); color: var(--forest); }
.nav__link.is-active { color: var(--forest); }
.nav__link.is-active::after { content:""; display:block; height:2px; background:var(--gold); border-radius:2px; margin-top:3px; }
.nav__cta { margin-left:.4rem; }
.nav__toggle { display:none; width:42px; height:42px; border:1px solid var(--line); border-radius:10px; background:var(--white); align-items:center; justify-content:center; }
.nav__toggle span, .nav__toggle span::before, .nav__toggle span::after { content:""; display:block; width:18px; height:2px; background:var(--forest); position:relative; transition: transform .25s var(--ease), opacity .2s; }
.nav__toggle span::before { position:absolute; top:-6px; } .nav__toggle span::after { position:absolute; top:6px; }
.nav.open .nav__toggle span { background:transparent; }
.nav.open .nav__toggle span::before { transform: translateY(6px) rotate(45deg); }
.nav.open .nav__toggle span::after  { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 860px) {
  .nav__toggle { display:flex; }
  .nav__links {
    position:absolute; top:100%; left:0; right:0;
    flex-direction:column; align-items:stretch; gap:.15rem;
    background:var(--offwhite); border-bottom:1px solid var(--line);
    padding: .6rem clamp(1.1rem,4vw,2.5rem) 1.2rem;
    box-shadow: var(--shadow);
    transform: translateY(-8px); opacity:0; pointer-events:none; transition: .25s var(--ease);
  }
  .nav.open .nav__links { transform:none; opacity:1; pointer-events:auto; }
  .nav__link { padding:.8rem .6rem; }
  .nav__cta { margin:.4rem 0 0; }
}

/* ---- Buttons ---- */
.btn { display:inline-flex; align-items:center; gap:.5rem; padding:.8rem 1.4rem; border-radius:10px; font-weight:600; font-size:.95rem; border:1.5px solid transparent; transition: transform .18s var(--ease), box-shadow .25s var(--ease), background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease); white-space:nowrap; }
.btn svg { width:1em; height:1em; }
.btn--primary { background:var(--gold); color:var(--forest-deep); box-shadow: 0 2px 0 #b6870f; }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 5px 18px rgba(212,160,23,.4), 0 2px 0 #b6870f; }
.btn--primary:active { transform: translateY(0); box-shadow: 0 1px 0 #b6870f; }
.btn--ghost { background:transparent; color:var(--forest); border-color:var(--forest); }
.btn--ghost:hover { background:var(--forest); color:var(--offwhite); transform: translateY(-2px); }
.btn--on-dark { background:transparent; color:var(--offwhite); border-color:rgba(247,245,240,.45); }
.btn--on-dark:hover { background:var(--offwhite); color:var(--forest); border-color:var(--offwhite); }
.btn--sm { padding:.55rem 1rem; font-size:.86rem; }

/* ============================================================================
   HERO  (signature: the four-quadrant 4-in-1 mark)
   ============================================================================ */
.hero { position:relative; background:var(--forest); color:var(--offwhite); overflow:hidden; }
.hero__bg { position:absolute; inset:0; opacity:.5; pointer-events:none; }
.hero__inner { position:relative; display:grid; grid-template-columns: 1.15fr .85fr; gap: clamp(2rem,5vw,4.5rem); align-items:center; padding-block: clamp(3.5rem, 9vw, 7rem); }
.hero__eyebrow { color:var(--gold-soft); }
.hero h1 { color:var(--offwhite); font-size:var(--fs-hero); font-weight:600; margin-top:1.1rem; letter-spacing:-.02em; }
.hero h1 .phase { display:inline-block; }
.hero h1 .gold { color:var(--gold); font-style:italic; }
.hero__lead { font-size:var(--fs-lead); color:rgba(247,245,240,.82); max-width:46ch; margin-top:1.4rem; line-height:1.6; }
.hero__cta { display:flex; flex-wrap:wrap; gap:.8rem; margin-top:2rem; }
.hero__meta { display:flex; flex-wrap:wrap; gap:1.6rem; margin-top:2.6rem; padding-top:1.6rem; border-top:1px solid rgba(247,245,240,.16); }
.hero__stat { display:flex; flex-direction:column; }
.hero__stat b { font-family:var(--display); font-size:1.9rem; color:var(--gold); font-weight:600; line-height:1; }
.hero__stat span { font-size:var(--fs-xs); font-family:var(--mono); letter-spacing:.1em; text-transform:uppercase; color:rgba(247,245,240,.7); margin-top:.45rem; }

/* The quadrant mark */
.quadmark { position:relative; aspect-ratio:1; max-width:420px; margin-inline:auto; width:100%; }
.quadmark svg { width:100%; height:100%; filter: drop-shadow(0 18px 40px rgba(0,0,0,.3)); }

@media (max-width: 880px) {
  .hero__inner { grid-template-columns:1fr; gap:2.5rem; }
  .quadmark { max-width:330px; order:-1; }
  .hero__meta { gap:1.2rem; }
}

/* ============================================================================
   METHOD STRIP  (Reference / Practice / Apply / Assess)
   ============================================================================ */
.method { background:var(--offwhite-warm); border-bottom:1px solid var(--line); }
.method__head { max-width:60ch; margin-bottom:2.6rem; }
.method__head h2 { font-size:var(--fs-h2); margin-top:1rem; }
.method__head p { color:var(--charcoal-soft); font-size:var(--fs-lead); margin-top:.8rem; }
.method__grid { display:grid; grid-template-columns:repeat(4,1fr); gap:1.1rem; }
.phase-card { background:var(--white); border:1px solid var(--line); border-radius:var(--radius); padding:1.6rem 1.4rem; position:relative; overflow:hidden; transition: transform .25s var(--ease), box-shadow .25s var(--ease); }
.phase-card::before { content:""; position:absolute; top:0; left:0; right:0; height:4px; background:var(--accent,var(--gold)); }
.phase-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.phase-card__n { font-family:var(--mono); font-size:.75rem; color:var(--charcoal-soft); letter-spacing:.1em; }
.phase-card__ico { width:38px; height:38px; margin:.4rem 0 1rem; color:var(--accent,var(--forest)); }
.phase-card h3 { font-size:var(--fs-h3); }
.phase-card p { font-size:var(--fs-sm); color:var(--charcoal-soft); margin-top:.5rem; line-height:1.55; }
.phase-card:nth-child(1){--accent:var(--teal);}
.phase-card:nth-child(2){--accent:var(--gold);}
.phase-card:nth-child(3){--accent:var(--coral);}
.phase-card:nth-child(4){--accent:var(--navy);}
@media (max-width: 880px){ .method__grid{ grid-template-columns:repeat(2,1fr);} }
@media (max-width: 480px){ .method__grid{ grid-template-columns:1fr;} }

/* ============================================================================
   GRADE BANDS
   ============================================================================ */
.bands__grid { display:grid; grid-template-columns:repeat(3,1fr); gap:1.3rem; }
.band {
  position:relative; border-radius:var(--radius); overflow:hidden; padding:2.2rem 1.8rem 2rem;
  background:var(--white); border:1px solid var(--line); display:flex; flex-direction:column; min-height:280px;
  transition: transform .28s var(--ease), box-shadow .28s var(--ease), border-color .28s var(--ease);
}
.band:hover { transform: translateY(-5px); box-shadow:var(--shadow-lg); border-color:var(--band); }
.band__num { font-family:var(--display); font-size:4.4rem; font-weight:600; line-height:.85; color:var(--band); opacity:.16; position:absolute; top:1rem; right:1.3rem; }
.band__grade { font-family:var(--mono); font-size:var(--fs-xs); letter-spacing:.14em; text-transform:uppercase; color:var(--band); font-weight:600; }
.band h3 { font-size:var(--fs-h3); margin-top:.5rem; }
.band p { font-size:var(--fs-sm); color:var(--charcoal-soft); margin-top:.6rem; flex:1; }
.band__foot { display:flex; align-items:center; justify-content:space-between; margin-top:1.4rem; padding-top:1.1rem; border-top:1px solid var(--line); }
.band__count { font-size:var(--fs-sm); color:var(--charcoal-soft); }
.band__count b { color:var(--forest); font-size:1.05rem; }
.band__go { display:inline-flex; align-items:center; gap:.4rem; font-weight:600; font-size:.9rem; color:var(--band); }
.band__go svg { transition: transform .2s var(--ease); width:1em; height:1em; }
.band:hover .band__go svg { transform: translateX(4px); }
.band--6 { --band: var(--teal); }
.band--7 { --band: var(--coral); }
.band--8 { --band: var(--navy); }
@media (max-width: 820px){ .bands__grid{ grid-template-columns:1fr;} }

/* Section headers shared */
.sec-head { display:flex; align-items:flex-end; justify-content:space-between; gap:1.5rem; flex-wrap:wrap; margin-bottom:2.4rem; }
.sec-head__t h2 { font-size:var(--fs-h2); margin-top:1rem; }
.sec-head__t p { color:var(--charcoal-soft); margin-top:.6rem; max-width:52ch; }

/* ============================================================================
   PRODUCT CARDS  (image slot built in — graceful CSS fallback art)
   ============================================================================ */
.card-grid { display:grid; grid-template-columns:repeat(auto-fill, minmax(280px,1fr)); gap:1.4rem; }
.pcard {
  background:var(--white); border:1px solid var(--line); border-radius:var(--radius); overflow:hidden;
  display:flex; flex-direction:column; position:relative; transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
}
.pcard:hover { transform: translateY(-5px); box-shadow:var(--shadow-lg); border-color:var(--g); }
.pcard__media { position:relative; aspect-ratio: 1/1; background:var(--g-tint); overflow:hidden; }
.pcard__media img { position:absolute; inset:0; width:100%; height:100%; object-fit:cover; z-index:2; }
/* Fallback "thumbnail" rendered in pure CSS/SVG when no image present */
.pcard__art { position:absolute; inset:0; display:flex; flex-direction:column; z-index:1; }
.pcard__art-top { background:var(--forest); color:var(--offwhite); padding:.8rem 1rem .7rem; display:flex; align-items:center; justify-content:space-between; }
.pcard__art-eyebrow { font-family:var(--mono); font-size:.56rem; letter-spacing:.14em; text-transform:uppercase; color:var(--gold-soft); }
.pcard__art-wm { font-family:var(--mono); font-size:.5rem; letter-spacing:.1em; text-transform:uppercase; color:rgba(247,245,240,.65); }
.pcard__art-body { flex:1; display:flex; flex-direction:column; justify-content:center; align-items:center; text-align:center; padding:1.1rem 1.2rem; gap:.7rem; background:
  radial-gradient(circle at 18% 20%, rgba(0,0,0,.02), transparent 60%), var(--offwhite); position:relative; }
.pcard__art-quad { width:52px; height:52px; opacity:.9; }
.pcard__art-skill { font-family:var(--display); font-weight:600; font-size:1.18rem; color:var(--charcoal); line-height:1.12; }
.pcard__art-sub { font-family:var(--mono); font-size:.6rem; letter-spacing:.12em; text-transform:uppercase; color:var(--charcoal-soft); }
.pcard__art-bottom { height:8px; background:var(--g); }
.pcard__badge { position:absolute; top:.7rem; right:.7rem; z-index:2; background:var(--gold); color:var(--forest-deep); font-size:.62rem; font-weight:700; letter-spacing:.08em; text-transform:uppercase; padding:.3rem .55rem; border-radius:6px; font-family:var(--mono); box-shadow:var(--shadow-sm); }
.pcard__body { padding:1.2rem 1.3rem 1.3rem; display:flex; flex-direction:column; flex:1; }
.pcard__ccss { align-self:flex-start; font-family:var(--mono); font-size:var(--fs-xs); color:var(--g); background:var(--g-tint); padding:.25rem .55rem; border-radius:6px; font-weight:500; letter-spacing:.02em; }
.pcard__grade-dot { display:inline-block; width:7px; height:7px; border-radius:50%; background:var(--g); margin-right:.4rem; vertical-align:middle; }
.pcard h3 { font-size:1.12rem; margin-top:.75rem; line-height:1.18; }
.pcard__desc { font-size:var(--fs-sm); color:var(--charcoal-soft); margin-top:.55rem; line-height:1.5; flex:1; }
.pcard__foot { margin-top:1.1rem; display:flex; align-items:center; justify-content:space-between; gap:.6rem; }
.pcard__bundle { font-size:var(--fs-xs); color:var(--charcoal-soft); }
.pcard__tpt { display:inline-flex; align-items:center; gap:.4rem; font-weight:600; font-size:.86rem; color:var(--forest); border:1.5px solid var(--line); padding:.5rem .85rem; border-radius:9px; transition: background .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease); }
.pcard__tpt svg { width:.9em; height:.9em; transition: transform .2s var(--ease); }
.pcard__tpt:hover { background:var(--g); border-color:var(--g); color:#fff; }
.pcard__tpt:hover svg { transform: translate(2px,-2px); }
.pcard--6 { --g:var(--teal); --g-tint:var(--teal-tint); }
.pcard--7 { --g:var(--coral); --g-tint:var(--coral-tint); }
.pcard--8 { --g:var(--navy); --g-tint:var(--navy-tint2); }
.pcard--free .pcard__tpt { background:var(--forest); color:#fff; border-color:var(--forest); }
.pcard--free .pcard__tpt:hover { background:var(--forest-deep); }
/* whole-card click target routing to the sheet landing page */
.pcard__cta::after { content:""; position:absolute; inset:0; z-index:4; }
.pcard__cta:focus-visible { outline:2px solid var(--g); outline-offset:2px; }

/* ============================================================================
   CATALOG controls
   ============================================================================ */
.catbar { position:sticky; top:62px; z-index:50; background:rgba(247,245,240,.92); backdrop-filter:blur(10px); -webkit-backdrop-filter:blur(10px); border-block:1px solid var(--line); padding-block:1rem; margin-bottom:2.5rem; }
.catbar__row { display:flex; flex-wrap:wrap; gap:1rem; align-items:center; justify-content:space-between; }
.filtergroup { display:flex; flex-wrap:wrap; gap:.4rem; align-items:center; }
.filtergroup__label { font-family:var(--mono); font-size:var(--fs-xs); letter-spacing:.1em; text-transform:uppercase; color:var(--charcoal-soft); margin-right:.3rem; }
.chip { border:1.5px solid var(--line); background:var(--white); color:var(--charcoal); padding:.45rem .9rem; border-radius:999px; font-size:.85rem; font-weight:500; transition: all .18s var(--ease); }
.chip:hover { border-color:var(--forest-soft); }
.chip.is-active { background:var(--forest); color:var(--offwhite); border-color:var(--forest); }
.chip[data-grade="6"].is-active { background:var(--teal); border-color:var(--teal); }
.chip[data-grade="7"].is-active { background:var(--coral); border-color:var(--coral); }
.chip[data-grade="8"].is-active { background:var(--navy); border-color:var(--navy); }
.search { position:relative; min-width:230px; flex:1; max-width:340px; }
.search input { width:100%; padding:.6rem .9rem .6rem 2.4rem; border:1.5px solid var(--line); border-radius:10px; background:var(--white); font-size:.9rem; color:var(--charcoal); transition: border-color .2s var(--ease); }
.search input:focus { border-color:var(--gold); outline:none; }
.search svg { position:absolute; left:.8rem; top:50%; transform:translateY(-50%); width:1rem; height:1rem; color:var(--charcoal-soft); pointer-events:none; }
.catbar__count { font-size:var(--fs-sm); color:var(--charcoal-soft); font-family:var(--mono); }
.catbar__count b { color:var(--forest); }
.catalog-empty { text-align:center; padding:4rem 1rem; color:var(--charcoal-soft); display:none; }
.catalog-empty.show { display:block; }
.catalog-empty h3 { margin-bottom:.5rem; }
.pcard.is-hidden { display:none; }

/* ============================================================================
   FREE section
   ============================================================================ */
.free-hero { background:var(--forest); color:var(--offwhite); position:relative; overflow:hidden; }
.free-hero__inner { position:relative; max-width:60ch; padding-block: clamp(3rem,7vw,5.5rem); }
.free-hero h1 { color:var(--offwhite); font-size:var(--fs-h1); margin-top:1rem; }
.free-hero p { color:rgba(247,245,240,.82); font-size:var(--fs-lead); margin-top:1rem; }
.free-grid { display:grid; grid-template-columns:repeat(2,1fr); gap:1.6rem; max-width:760px; }
@media (max-width:680px){ .free-grid{ grid-template-columns:1fr; } }

/* ============================================================================
   PROSE (about / contact)
   ============================================================================ */
.page-hero { background:var(--offwhite-warm); border-bottom:1px solid var(--line); }
.page-hero__inner { padding-block: clamp(2.6rem,6vw,4.5rem); max-width:62ch; }
.page-hero h1 { font-size:var(--fs-h1); margin-top:1rem; }
.page-hero p { color:var(--charcoal-soft); font-size:var(--fs-lead); margin-top:1rem; }
.prose { max-width:68ch; }
.prose p { margin-bottom:1.2rem; color:var(--charcoal); }
.prose h2 { font-size:var(--fs-h2); margin:2.6rem 0 1rem; }
.prose h3 { font-size:var(--fs-h3); margin:1.8rem 0 .6rem; }
.prose strong { color:var(--forest); }
.prose a { color:var(--forest); text-decoration:underline; text-decoration-color:var(--gold); text-underline-offset:3px; }
.prose a:hover { color:var(--gold); }

.about-grid { display:grid; grid-template-columns: 1fr 1fr; gap:clamp(2rem,5vw,4rem); align-items:start; }
@media (max-width:820px){ .about-grid{ grid-template-columns:1fr; } }
.stat-block { background:var(--white); border:1px solid var(--line); border-radius:var(--radius); padding:1.8rem; position:sticky; top:90px; }
.stat-row { display:flex; align-items:baseline; gap:.8rem; padding:.9rem 0; border-bottom:1px solid var(--line); }
.stat-row:last-child{ border-bottom:none; }
.stat-row b { font-family:var(--display); font-size:1.7rem; color:var(--gold); min-width:2.6ch; }
.stat-row span { font-size:var(--fs-sm); color:var(--charcoal-soft); }

/* Contact cards */
.contact-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(220px,1fr)); gap:1.3rem; }
.contact-card { background:var(--white); border:1px solid var(--line); border-radius:var(--radius); padding:1.7rem; transition: transform .25s var(--ease), box-shadow .25s var(--ease); }
.contact-card:hover { transform:translateY(-4px); box-shadow:var(--shadow); }
.contact-card__ico { width:40px; height:40px; color:var(--gold); margin-bottom:1rem; }
.contact-card h3 { font-size:1.1rem; }
.contact-card p { font-size:var(--fs-sm); color:var(--charcoal-soft); margin-top:.4rem; }
.contact-card a { color:var(--forest); font-weight:600; display:inline-block; margin-top:.7rem; text-decoration:underline; text-decoration-color:var(--gold); text-underline-offset:3px; word-break:break-word; }
.contact-card a:hover { color:var(--gold); }

/* ============================================================================
   CTA band
   ============================================================================ */
.ctaband { background: linear-gradient(135deg, var(--forest) 0%, var(--forest-deep) 100%); color:var(--offwhite); position:relative; overflow:hidden; }
.ctaband__inner { position:relative; text-align:center; padding-block: clamp(3rem,7vw,5rem); max-width:56ch; margin-inline:auto; }
.ctaband h2 { color:var(--offwhite); font-size:var(--fs-h2); }
.ctaband p { color:rgba(247,245,240,.8); margin-top:.9rem; font-size:var(--fs-lead); }
.ctaband__btns { display:flex; gap:.8rem; justify-content:center; flex-wrap:wrap; margin-top:1.8rem; }

/* ============================================================================
   FOOTER
   ============================================================================ */
.footer { background:var(--forest-deep); color:rgba(247,245,240,.78); padding-block: 3.5rem 2rem; }
.footer__grid { display:grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap:2rem; }
.footer__brand .brand__name { color:var(--offwhite); }
.footer__brand p { font-size:var(--fs-sm); margin-top:1rem; max-width:34ch; color:rgba(247,245,240,.62); }
.footer h4 { color:var(--gold-soft); font-family:var(--mono); font-size:var(--fs-xs); letter-spacing:.12em; text-transform:uppercase; font-weight:500; margin-bottom:1rem; }
.footer__links li { margin-bottom:.55rem; }
.footer__links a { font-size:var(--fs-sm); color:rgba(247,245,240,.78); transition:color .2s; }
.footer__links a:hover { color:var(--gold-soft); }
.footer__bottom { display:flex; flex-wrap:wrap; gap:1rem; justify-content:space-between; align-items:center; margin-top:2.8rem; padding-top:1.6rem; border-top:1px solid rgba(247,245,240,.12); font-size:var(--fs-xs); color:rgba(247,245,240,.55); }
.footer__bottom a { color:rgba(247,245,240,.7); text-decoration:underline; text-underline-offset:2px; }
@media (max-width:820px){ .footer__grid{ grid-template-columns:1fr 1fr; gap:1.8rem; } }
@media (max-width:480px){ .footer__grid{ grid-template-columns:1fr; } }

/* ---- Reveal on scroll ---- */
.reveal { opacity:0; transform: translateY(18px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
.reveal.in { opacity:1; transform:none; }
@media (prefers-reduced-motion: reduce){ .reveal{ opacity:1; transform:none; } }

/* ---- decorative dotted-grid background (math grid-paper nod) ---- */
.gridpaper { background-image: radial-gradient(var(--line) 1px, transparent 1px); background-size: 26px 26px; }

/* ---- SVG sizing safety: contained decorative marks always fill their box ---- */
.brand__mark svg,
.quadmark svg,
.hero__bg svg,
.phase-card__ico svg,
.contact-card__ico svg,
.pcard__art-quad svg { width: 100%; height: 100%; display: block; }
.phase-card__ico, .contact-card__ico, .pcard__art-quad { display: inline-block; }

/* ============================================================================
   SITE ASSET UPGRADES — added S1 v1.0.5+
   ============================================================================ */

/* ---- Hero: real photo background ---- */
.hero {
  background:
    linear-gradient(160deg, rgba(17,42,36,.86) 0%, rgba(26,60,52,.78) 60%, rgba(17,42,36,.90) 100%),
    url('/assets/images/hero_bg.jpg') center / cover no-repeat;
}

/* ---- Method banner (full-width image, replaces phase cards) ---- */
.method-banner { line-height:0; overflow:hidden; }
.method-banner__img { width:100%; height:auto; display:block; max-height:520px; object-fit:cover; object-position:center; }

/* ---- Product spread section ---- */
.spread { background:var(--white); }
.spread__grid { display:grid; grid-template-columns:1fr 1fr; gap:clamp(2.5rem,5vw,5rem); align-items:center; }
.spread__copy { }
.spread__copy h2 { font-size:var(--fs-h2); margin-top:1rem; }
.spread__copy p { color:var(--charcoal-soft); font-size:var(--fs-lead); margin-top:.9rem; line-height:1.65; }
.spread__list { margin:1.4rem 0 0; display:flex; flex-direction:column; gap:.7rem; }
.spread__list li { display:flex; align-items:flex-start; gap:.75rem; font-size:var(--fs-sm); color:var(--charcoal); }
.spread__list li::before { content:""; width:8px; height:8px; border-radius:50%; background:var(--gold); flex:none; margin-top:.35em; }
.spread__img { width:100%; border-radius:var(--radius); box-shadow:var(--shadow-lg); display:block; }
@media (max-width:820px) { .spread__grid { grid-template-columns:1fr; } }

/* ---- Grade band photos ---- */
.band__photo {
  display:block;
  width:calc(100% + 3.6rem);
  margin: -2.2rem -1.8rem 1.5rem;
  height:170px;
  object-fit:cover;
  object-position:center;
  border-radius:calc(var(--radius) - 1px) calc(var(--radius) - 1px) 0 0;
}

/* ---- Catalog page hero with photo strip ---- */
.catalog-page-hero {
  background:
    url('/assets/images/catalog_header.png') right center / auto 100% no-repeat,
    var(--offwhite-warm);
  border-bottom:1px solid var(--line);
}
.catalog-page-hero .page-hero__inner { position:relative; }

/* ---- About workspace photo ---- */
.about__photo { width:100%; border-radius:var(--radius); display:block; box-shadow:var(--shadow-lg); margin-bottom:1.6rem; }

/* ---- Free page hero: 2-col with photo ---- */
.free-hero__wrap { position:relative; display:grid; grid-template-columns:1fr 1fr; gap:clamp(2rem,5vw,4rem); align-items:center; padding-block:clamp(3rem,7vw,5.5rem); }
.free-hero__photo { position:relative; }
.free-hero__img { width:100%; border-radius:var(--radius); display:block; box-shadow:var(--shadow-lg); }
@media (max-width:820px) {
  .free-hero__wrap { grid-template-columns:1fr; }
  .free-hero__photo { display:none; }
}

/* ============================================================================
   Individual sheet landing pages (added S2)
   ============================================================================ */
.sheet--6 { --g:var(--teal);  --g-tint:var(--teal-tint); }
.sheet--7 { --g:var(--coral); --g-tint:var(--coral-tint); }
.sheet--8 { --g:var(--navy);  --g-tint:var(--navy-tint2); }

/* breadcrumb */
.breadcrumb { border-bottom:1px solid var(--line); background:var(--offwhite); }
.breadcrumb ol { list-style:none; display:flex; flex-wrap:wrap; align-items:center; gap:.5rem; margin:0; padding:.8rem 0; font-family:var(--mono); font-size:var(--fs-xs); letter-spacing:.01em; }
.breadcrumb li { display:flex; align-items:center; gap:.5rem; color:var(--charcoal-soft); }
.breadcrumb li:not(:last-child)::after { content:"/"; color:var(--line); }
.breadcrumb a { color:var(--charcoal-soft); }
.breadcrumb a:hover { color:var(--g, var(--forest)); }
.breadcrumb li[aria-current] { color:var(--forest); font-weight:500; }

/* hero */
.sheet-hero__grid { display:grid; grid-template-columns:minmax(0,420px) 1fr; gap:clamp(1.6rem,4vw,3.4rem); align-items:center; }
.sheet-hero__media { position:relative; aspect-ratio:1/1; border-radius:var(--radius); overflow:hidden; border:1px solid var(--line); background:var(--g-tint); box-shadow:var(--shadow); }
.sheet-hero__media img { position:absolute; inset:0; width:100%; height:100%; object-fit:cover; z-index:2; }
.sheet__badge { z-index:3; }
.sheet-hero__tags { display:flex; flex-wrap:wrap; gap:.5rem; margin-bottom:1rem; }
.sheet-chip { font-family:var(--mono); font-size:var(--fs-xs); letter-spacing:.02em; color:var(--charcoal-soft); background:var(--white); border:1px solid var(--line); padding:.32rem .6rem; border-radius:7px; }
.sheet-chip--ccss { color:#fff; background:var(--g, var(--forest)); border-color:var(--g, var(--forest)); font-weight:500; }
.sheet-hero__copy h1 { font-size:var(--fs-h1); line-height:1.08; }
.sheet-hero__ican { font-size:var(--fs-lead); color:var(--charcoal-soft); margin-top:1rem; max-width:46ch; line-height:1.45; }
.sheet-hero__cta { display:flex; flex-wrap:wrap; gap:.7rem; margin-top:1.6rem; }
.sheet__tpt { background:var(--g, var(--forest)); border-color:var(--g, var(--forest)); }
.sheet__tpt:hover { filter:brightness(.94); }

/* detail body */
.sheet-detail__grid { display:grid; grid-template-columns:1fr minmax(0,340px); gap:clamp(1.6rem,4vw,3rem); align-items:start; }
.sheet-block { margin-bottom:1.8rem; }
.sheet-block h2 { font-size:var(--fs-h3); margin-bottom:.6rem; }
.sheet-block p { color:var(--charcoal-soft); line-height:1.65; max-width:62ch; }
.sheet-block strong { color:var(--forest); font-weight:600; }

/* facts card */
.sheet-facts { position:sticky; top:90px; background:var(--white); border:1px solid var(--line); border-radius:var(--radius); padding:1.5rem; box-shadow:var(--shadow-sm); }
.sheet-facts__title { font-family:var(--mono); font-size:var(--fs-xs); text-transform:uppercase; letter-spacing:.12em; color:var(--charcoal-soft); margin-bottom:.5rem; }
.sheet-facts__ccss { font-family:var(--mono); font-size:1.25rem; font-weight:500; color:var(--g, var(--forest)); }
.sheet-facts__text { font-size:var(--fs-sm); color:var(--charcoal-soft); line-height:1.55; margin-top:.6rem; }
.sheet-facts__dl { margin:1.1rem 0; border-top:1px solid var(--line); }
.sheet-facts__dl > div { display:flex; justify-content:space-between; gap:1rem; padding:.6rem 0; border-bottom:1px solid var(--line); }
.sheet-facts__dl dt { font-size:var(--fs-sm); color:var(--charcoal-soft); }
.sheet-facts__dl dd { font-size:var(--fs-sm); font-weight:500; color:var(--charcoal); text-align:right; }
.sheet-facts .btn { width:100%; margin-top:.4rem; }

/* prev / next */
.sheetnav__row { display:grid; grid-template-columns:1fr 1fr; gap:1rem; }
.sheetnav__link { display:flex; flex-direction:column; gap:.25rem; padding:1.1rem 1.3rem; border:1px solid var(--line); border-radius:var(--radius); background:var(--white); transition:border-color .2s var(--ease), transform .2s var(--ease), box-shadow .2s var(--ease); }
.sheetnav__link:hover { border-color:var(--g, var(--forest)); transform:translateY(-3px); box-shadow:var(--shadow); }
.sheetnav__link.is-empty { border:1px dashed var(--line); background:transparent; pointer-events:none; }
.sheetnav__prev { align-items:flex-start; text-align:left; }
.sheetnav__next { align-items:flex-end; text-align:right; }
.sheetnav__dir { font-family:var(--mono); font-size:var(--fs-xs); text-transform:uppercase; letter-spacing:.1em; color:var(--charcoal-soft); }
.sheetnav__name { font-family:var(--display); font-size:1.05rem; font-weight:500; color:var(--forest); line-height:1.15; }

/* disabled CTA (pending products) */
.btn.is-disabled { opacity:.55; cursor:not-allowed; pointer-events:none; }

@media (max-width:820px) {
  .sheet-hero__grid { grid-template-columns:1fr; }
  .sheet-hero__media { max-width:360px; }
  .sheet-detail__grid { grid-template-columns:1fr; }
  .sheet-facts { position:static; }
}
@media (max-width:520px) {
  .sheetnav__row { grid-template-columns:1fr; }
  .sheetnav__next { align-items:flex-start; text-align:left; }
}

/* ============================================================================
   Bundles — cards, /bundles page, sheet cross-link (added S3)
   ============================================================================ */
.sheet--ultimate { --g:var(--gold); --g-tint:var(--gold-tint, #faf3df); }

/* bundle cards reuse .pcard; accents + feature treatment */
.bcard--6 { --bc:var(--teal); }
.bcard--7 { --bc:var(--coral); }
.bcard--8 { --bc:var(--navy); }
.bcard--all, .bcard--feature.bcard--all { --bc:var(--gold); }
.bcard .pcard__media { background:var(--g-tint, #f3f4f2); }
.bcard__badge { background:var(--forest); color:#fff; }
.bcard--feature { border-color:var(--bc, var(--gold)); }
.bcard--feature .pcard__name { font-size:1.22rem; }
.bcard .pcard__strand { color:var(--bc, var(--forest)); font-weight:600; }

/* bundles page grade sections */
.bundles-grade__head { display:flex; align-items:baseline; justify-content:space-between; gap:1rem; flex-wrap:wrap; margin-bottom:1.3rem; }
.bundles-grade__head h2 { font-size:var(--fs-h2, 1.8rem); }
.bundles-grade__all { font-family:var(--mono); font-size:var(--fs-sm); color:var(--charcoal-soft); white-space:nowrap; }
.bundles-grade__all:hover { color:var(--forest); }

/* homepage bundles band */
.bundles-band { background:var(--offwhite); }

/* sheet page: "save with a bundle" cross-link */
.sheet-bundles__title { font-size:var(--fs-h3); margin-bottom:.4rem; }
.sheet-bundles__lead { color:var(--charcoal-soft); max-width:60ch; margin-bottom:1rem; line-height:1.55; }
.bundle-chips { display:flex; flex-wrap:wrap; gap:.6rem; }
.bundle-chip { display:inline-flex; align-items:center; gap:.5rem; padding:.5rem .85rem; border:1px solid var(--line); border-radius:999px; background:var(--white); font-size:var(--fs-sm); color:var(--forest); transition:border-color .2s var(--ease), background .2s var(--ease), transform .2s var(--ease); }
.bundle-chip:hover { border-color:var(--g, var(--forest)); transform:translateY(-2px); }
.bundle-chip__n { font-family:var(--mono); font-size:var(--fs-xs); background:var(--g-tint, #eef1ef); color:var(--g, var(--forest)); padding:.1rem .45rem; border-radius:999px; }

/* ============================================================================
   KIT EMAIL SIGNUP (site-wide, above footer)
   ============================================================================ */
.kit-signup { background:var(--white); border-top:1px solid var(--line); border-bottom:1px solid var(--line); padding-block:clamp(3rem,6vw,5rem); }
.kit-signup__inner { display:grid; grid-template-columns:1fr 1fr; gap:clamp(2rem,5vw,4rem); align-items:center; }
.kit-signup__copy .eyebrow { margin-bottom:.2rem; }
.kit-signup__copy h2 { font-size:var(--fs-h2); margin-top:.75rem; }
.kit-signup__copy p { color:var(--charcoal-soft); margin-top:.75rem; font-size:var(--fs-lead); max-width:40ch; line-height:1.55; }
/* Ensure Kit's injected form container sits flush */
.kit-signup__form { min-width:0; }
.kit-signup__form [data-uid] { display:block; }
@media (max-width:760px) {
  .kit-signup__inner { grid-template-columns:1fr; }
}