/* ConstrCalc - Bold Industrial Theme */
@import url('https://fonts.googleapis.com/css2?family=Barlow:wght@600;700;800;900&family=IBM+Plex+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500&display=swap');

* { margin: 0; padding: 0; box-sizing: border-box; }
*:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
  border-radius: 1px;
}

/* Skip-to-content link for accessibility (visible on focus only) */
.skip-to-content {
  position: absolute;
  top: -100px;
  left: 12px;
  z-index: 10000;
  background: var(--primary);
  color: #000;
  padding: 12px 20px;
  font-family: 'Barlow', sans-serif;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: top 200ms cubic-bezier(.16,1,.3,1);
}
.skip-to-content:focus, .skip-to-content:focus-visible {
  top: 12px;
  color: #000;
}

:root {
  --primary: #FFB800;
  --primary-hover: #ffc933;
  --accent: #F97316;
  --danger: #ef4444;
  --success: #10b981;

  /* dark mode defaults — softened contrast + input surface bump */
  --bg: #09090b;
  --surface: #18181b;
  --surface-2: #27272a;
  --input-bg: #1a1a1f;
  --text: #ffffff;
  --text-muted: #a1a1aa;
  --border: #2a2a2e;
  --border-strong: #3f3f46;
  --grid: #3f3f46;
  --card: #111114;
  --scrim: rgba(0,0,0,0.6);

  /* Motion tokens */
  --ease-out: cubic-bezier(.16, 1, .3, 1);
  --ease-in-out: cubic-bezier(.65, 0, .35, 1);
  --dur-fast: 140ms;
  --dur-med: 220ms;
  --dur-slow: 320ms;
}
[data-theme="light"] {
  --bg: #f4f4f5;
  --surface: #ffffff;
  --surface-2: #e4e4e7;
  --input-bg: #ffffff;
  --text: #09090b;
  --text-muted: #52525b;
  --border: #d4d4d8;
  --border-strong: #a1a1aa;
  --grid: #d4d4d8;
  --card: #ffffff;
  --scrim: rgba(255,255,255,0.7);
}

html { scroll-behavior: smooth; }
body {
  font-family: 'IBM Plex Sans', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color 200ms, color 200ms;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Grain overlay */
body::before {
  content:'';
  position: fixed; inset: 0;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120' viewBox='0 0 120 120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.7'/%3E%3C/svg%3E");
  z-index: 9999;
  mix-blend-mode: overlay;
}

h1,h2,h3,h4,h5,h6 {
  font-family: 'Barlow', system-ui, sans-serif;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--text);
}
h1 { font-size: clamp(2.4rem, 5.5vw, 4.8rem); font-weight: 900; text-transform: uppercase; letter-spacing: -0.03em; line-height: 0.95; }
h2 { font-size: clamp(1.7rem, 3.2vw, 2.6rem); text-transform: uppercase; line-height: 1.1; }
h3 { font-size: 1.35rem; text-transform: uppercase; letter-spacing: 0.02em; line-height: 1.2; }
h4 { font-size: 1.1rem; line-height: 1.3; }
p  { color: var(--text-muted); }

a { color: var(--primary); text-decoration: none; transition: color 150ms; }
a:hover { color: var(--primary-hover); }

.mono { font-family: 'IBM Plex Mono', monospace; }
.container { max-width: 1400px; margin: 0 auto; padding: 0 24px; }
.section { padding: 112px 0; position: relative; }
.section-tight { padding: 64px 0; }
@media (max-width: 768px) {
  .section { padding: 72px 0; }
  .section-tight { padding: 48px 0; }
  .container { padding: 0 20px; }
}

/* Eyebrow labels */
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.24em;
  margin-bottom: 20px;
}
.eyebrow::before {
  content:''; width: 32px; height: 1px; background: var(--primary);
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 26px;
  font-family: 'Barlow', sans-serif;
  font-weight: 800;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border: 2px solid var(--primary);
  background: var(--primary);
  color: #000;
  cursor: pointer;
  border-radius: 0;
  min-height: 44px;
  transition: transform var(--dur-med) var(--ease-out),
              background-color var(--dur-fast),
              color var(--dur-fast),
              box-shadow var(--dur-med) var(--ease-out),
              border-color var(--dur-fast);
  will-change: transform;
}
.btn:hover { background: transparent; color: var(--primary); transform: translate(-2px, -2px); box-shadow: 4px 4px 0 var(--primary); }
.btn:active { transform: translate(1px, 1px); box-shadow: 1px 1px 0 var(--primary); transition-duration: 60ms; }
.btn:disabled, .btn[aria-disabled="true"] { opacity: 0.5; cursor: not-allowed; transform: none !important; box-shadow: none !important; }
.btn-outline { background: transparent; color: var(--text); border-color: var(--border-strong); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); box-shadow: 4px 4px 0 var(--primary); }
.btn-ghost { background: transparent; color: var(--text); border-color: transparent; }
.btn-ghost:hover { color: var(--primary); background: transparent; box-shadow: none; transform: none; }
.btn-sm { padding: 10px 18px; font-size: 0.8rem; min-height: 38px; }

/* HEADER */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 0; gap: 24px;
}
.logo {
  display: flex; align-items: center; gap: 12px;
  font-family: 'Barlow', sans-serif;
  font-weight: 900; font-size: 1.4rem;
  color: var(--text); text-transform: uppercase; letter-spacing: -0.02em;
}
.logo:hover { color: var(--primary); }
.logo-mark {
  width: 40px; height: 40px;
  display: inline-grid; place-items: center;
  color: var(--primary);
  transform: rotate(-3deg);
  flex-shrink: 0;
}
.logo-mark svg { width: 100%; height: 100%; display: block; }
.logo-mark svg [fill="var(--bg,#0B0B0D)"] { fill: var(--bg); }
.logo-sub { font-family: 'IBM Plex Mono', monospace; font-size: 0.65rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.2em; }

.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  color: var(--text);
  font-size: 0.88rem; font-weight: 500;
  padding: 10px 12px;
  text-transform: uppercase; letter-spacing: 0.06em;
  font-family: 'Barlow', sans-serif;
  position: relative;
  transition: color 120ms;
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-links a.active::after {
  content:''; position:absolute; left:12px; right:12px; bottom:2px; height:2px; background: var(--primary);
}
.nav-actions { display: flex; align-items: center; gap: 10px; }
.icon-btn {
  width: 44px; height: 44px;
  min-width: 44px; min-height: 44px;
  flex-shrink: 0;
  display: grid; place-items: center;
  border: 1px solid var(--border-strong); background: transparent; color: var(--text);
  cursor: pointer; border-radius: 0;
  transition: border-color var(--dur-fast), color var(--dur-fast), background var(--dur-fast);
}
.icon-btn:hover { border-color: var(--primary); color: var(--primary); background: color-mix(in srgb, var(--primary) 6%, transparent); }
.mobile-toggle { display: none; }

/* Dropdown menu */
.has-menu { position: relative; }
.dropdown {
  position: absolute; top: 100%; left: 0; min-width: 240px;
  background: var(--surface); border: 1px solid var(--border);
  padding: 8px; display: none; z-index: 90;
  box-shadow: 6px 6px 0 rgba(0,0,0,0.4);
}
.has-menu:hover .dropdown, .has-menu:focus-within .dropdown { display: block; }
.dropdown a { display: block; padding: 10px 14px; font-size: 0.85rem; color: var(--text); }
.dropdown a:hover { background: var(--surface-2); color: var(--primary); }

/* Mobile nav */
@media (max-width: 1024px) {
  .nav-links { display: none; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch; padding: 12px 24px 24px;
    background: var(--surface); border-bottom: 1px solid var(--border);
    max-height: calc(100vh - 80px); overflow-y: auto;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 14px 8px; border-bottom: 1px dashed var(--border); font-size: 1rem; }
  .nav-links a.active::after { display: none; }
  .has-menu:hover .dropdown, .has-menu:focus-within .dropdown { display: none; }
  .dropdown { position: static; box-shadow: none; border: none; padding: 0 0 0 12px; display: block; background: transparent; }
  .dropdown a { padding: 8px 8px; border-bottom: none; font-size: 0.9rem; }
  .mobile-toggle { display: grid; }
}
@media (max-width: 768px) {
  .nav-actions .btn { display: none !important; }
  .logo-sub { display: none; }
  .logo { font-size: 1.15rem; }
}

/* HERO */
.hero {
  position: relative;
  padding: 140px 0 120px;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}
.hero-bg {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(9,9,11,0.85), rgba(9,9,11,0.92)),
    url('https://images.pexels.com/photos/18078304/pexels-photo-18078304.jpeg');
  background-size: cover; background-position: center; background-repeat: no-repeat;
  z-index: -1;
}
[data-theme="light"] .hero-bg {
  background-image: linear-gradient(rgba(244,244,245,0.88), rgba(244,244,245,0.94)), url('https://images.pexels.com/photos/18078304/pexels-photo-18078304.jpeg');
}
.hero-grid { display: grid; grid-template-columns: 1fr 420px; gap: 60px; align-items: end; }
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; } }
.hero h1 { color: var(--text); margin-bottom: 24px; }
.hero h1 .accent { color: var(--primary); }
.hero p.lead { font-size: 1.2rem; max-width: 640px; margin-bottom: 36px; color: var(--text-muted); }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-meta {
  border: 1px dashed var(--border-strong);
  padding: 24px;
  background: color-mix(in srgb, var(--surface) 60%, transparent);
}
.hero-meta .row { display: flex; justify-content: space-between; align-items: baseline; padding: 12px 0; border-bottom: 1px dashed var(--border); }
.hero-meta .row:last-child { border-bottom: none; }
.hero-meta .label { font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.2em; color: var(--text-muted); }
.hero-meta .value { font-family: 'Barlow', sans-serif; font-weight: 900; font-size: 1.4rem; color: var(--primary); }

/* GRID BLUEPRINT SECTIONS */
.grid-blueprint {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 0;
  border-top: 1px dashed var(--border-strong);
  border-left: 1px dashed var(--border-strong);
}
.grid-blueprint .cell {
  border-right: 1px dashed var(--border-strong);
  border-bottom: 1px dashed var(--border-strong);
  padding: 32px;
  transition: background 200ms;
}
.grid-blueprint .cell:hover { background: color-mix(in srgb, var(--primary) 6%, transparent); }
.cell .cell-num {
  font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem;
  color: var(--primary); letter-spacing: 0.2em;
}
.cell .cell-icon {
  width: 48px; height: 48px; display: grid; place-items: center;
  background: var(--surface-2); color: var(--primary);
  margin: 16px 0;
}
.cell h4 { margin-bottom: 8px; }

/* Cards */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 32px;
  transition: border-color var(--dur-fast),
              transform var(--dur-med) var(--ease-out),
              box-shadow var(--dur-med) var(--ease-out),
              background-color var(--dur-fast);
  will-change: transform;
}
.card:hover {
  border-color: var(--primary);
  transform: translate(-3px, -3px);
  box-shadow: 6px 6px 0 color-mix(in srgb, var(--primary) 80%, transparent);
  background: color-mix(in srgb, var(--primary) 2%, var(--card));
}
.card-title { display:flex; align-items:center; gap: 12px; margin-bottom: 12px; }
.card-title i { color: var(--primary); }

.cards-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }

/* Section header */
.sect-head { max-width: 820px; margin-bottom: 48px; }
.sect-head p { font-size: 1.05rem; margin-top: 12px; }

/* Stat strip */
.stat-strip {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  border: 1px solid var(--border);
  background: var(--surface);
}
.stat-strip .stat { padding: 28px; border-right: 1px solid var(--border); }
.stat-strip .stat:last-child { border-right: none; }
.stat .num { font-family: 'Barlow', sans-serif; font-weight: 900; font-size: 2.4rem; color: var(--primary); line-height: 1; }
.stat .label { font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.2em; color: var(--text-muted); margin-top: 8px; }

/* Ad slot */
.ad-slot {
  border: 1px dashed var(--border-strong);
  background: var(--surface);
  min-height: 200px;
  display: grid; place-items: center;
  color: var(--text-muted);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.3em;
  margin: 48px 0;
}

/* FAQ Accordion */
.faq-list { border-top: 1px solid var(--border); }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-q {
  width: 100%; text-align: left;
  padding: 22px 4px; background: transparent; border: none; color: var(--text);
  font-family: 'Barlow', sans-serif; font-weight: 700; font-size: 1.05rem;
  cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 20px;
  transition: color 120ms;
}
.faq-q:hover { color: var(--primary); }
.faq-q .plus { font-family: 'IBM Plex Mono', monospace; color: var(--primary); font-size: 1.2rem; transition: transform 200ms; }
.faq-item.open .faq-q .plus { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 260ms ease; }
.faq-item.open .faq-a { max-height: 400px; }
.faq-a-inner { padding: 0 4px 22px; color: var(--text-muted); }

/* Testimonials */
.testimonial {
  border: 1px solid var(--border);
  padding: 32px;
  position: relative;
  background: var(--card);
}
.testimonial::before {
  content: '\201C'; position: absolute; top: -18px; left: 20px;
  font-family: 'Barlow', sans-serif; font-size: 4rem; font-weight: 900;
  color: var(--primary); line-height: 1;
  background: var(--bg); padding: 0 8px;
}
.testimonial p { color: var(--text); font-size: 1.05rem; margin-bottom: 20px; }
.testimonial .who { font-family: 'IBM Plex Mono', monospace; font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.2em; }
.testimonial .who strong { color: var(--primary); }

/* CTA */
.cta-band {
  border: 1px solid var(--border-strong);
  padding: 60px;
  background: var(--surface);
  display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: center;
}
@media (max-width: 720px) { .cta-band { grid-template-columns: 1fr; padding: 36px; } }
.cta-band h2 { margin-bottom: 8px; }

/* FOOTER */
.site-footer {
  background: var(--surface);
  border-top: 4px solid var(--primary);
  padding: 80px 0 40px;
  margin-top: 80px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 60px; }
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 500px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-col h5 { font-family: 'Barlow', sans-serif; font-weight: 800; text-transform: uppercase; letter-spacing: 0.1em; font-size: 0.85rem; margin-bottom: 20px; color: var(--text); }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: var(--text-muted); font-size: 0.9rem; transition: color 120ms; }
.footer-col a:hover { color: var(--primary); }
.footer-bottom {
  border-top: 1px dashed var(--border-strong);
  padding-top: 24px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px;
  font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.15em;
}

/* Prose (legal/blog) */
.prose { max-width: 820px; }
.prose h2 { margin: 40px 0 16px; }
.prose h3 { margin: 32px 0 12px; }
.prose p { margin-bottom: 16px; color: var(--text); }
.prose ul, .prose ol { padding-left: 24px; margin-bottom: 20px; color: var(--text); }
.prose li { margin-bottom: 8px; }
.prose a { text-decoration: underline; }
.prose strong { color: var(--text); }

/* Forms */
.form { display: grid; gap: 18px; max-width: 640px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 600px) { .form-row { grid-template-columns: 1fr; } }
.form label { display: block; font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.2em; margin-bottom: 8px; color: var(--text-muted); }
.form input, .form textarea, .form select {
  width: 100%;
  padding: 14px 16px;
  background: var(--input-bg);
  border: 1px solid var(--border-strong);
  color: var(--text);
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 1rem;
  border-radius: 0;
  min-height: 48px;
  transition: border-color var(--dur-fast), box-shadow var(--dur-fast), background-color var(--dur-fast);
}
.form input:hover, .form textarea:hover, .form select:hover {
  border-color: color-mix(in srgb, var(--primary) 50%, var(--border-strong));
}
.form input:focus, .form textarea:focus, .form select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 25%, transparent);
}
.form textarea { min-height: 160px; resize: vertical; }
.form .msg { padding: 12px 16px; border: 1px solid; font-family: 'IBM Plex Mono', monospace; font-size: 0.85rem; }
.form .msg.success { border-color: var(--success); color: var(--success); background: color-mix(in srgb, var(--success) 10%, transparent); }
.form .msg.error { border-color: var(--danger); color: var(--danger); background: color-mix(in srgb, var(--danger) 10%, transparent); }

/* Breadcrumb */
.breadcrumb { padding: 24px 0; font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.15em; color: var(--text-muted); border-bottom: 1px solid var(--border); }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { color: var(--border-strong); margin: 0 10px; }

/* Page header */
.page-header {
  padding: 100px 0 60px;
  border-bottom: 1px solid var(--border);
  background:
    repeating-linear-gradient(90deg, transparent 0 39px, var(--border) 39px 40px),
    var(--bg);
  background-size: 40px 100%;
}
.page-header .tag { color: var(--primary); font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.24em; }
.page-header h1 { margin-top: 12px; max-width: 900px; }
.page-header p { margin-top: 16px; max-width: 720px; font-size: 1.1rem; }

/* Marquee */
.marquee { overflow: hidden; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--surface); }
.marquee-track { display: flex; gap: 60px; padding: 20px 0; white-space: nowrap; animation: scroll 30s linear infinite; }
.marquee span { font-family: 'Barlow', sans-serif; font-weight: 900; font-size: 1.6rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-muted); }
.marquee span .dot { color: var(--primary); margin: 0 20px; }
@keyframes scroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

/* Blog cards */
.blog-card {
  border: 1px solid var(--border); padding: 28px; background: var(--card);
  transition: transform var(--dur-med) var(--ease-out),
              border-color var(--dur-fast),
              box-shadow var(--dur-med) var(--ease-out);
  display: flex; flex-direction: column; gap: 12px; height: 100%;
  will-change: transform;
}
.blog-card:hover {
  transform: translate(-3px, -3px);
  border-color: var(--primary);
  box-shadow: 6px 6px 0 color-mix(in srgb, var(--primary) 60%, transparent);
}
.blog-card .meta { font-family: 'IBM Plex Mono', monospace; font-size: 0.7rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.2em; }
.blog-card h3 { color: var(--text); transition: color var(--dur-fast); }
.blog-card:hover h3 { color: var(--primary); }
.blog-card p { color: var(--text-muted); font-size: 0.95rem; }
.blog-card .read-more { margin-top: auto; font-family: 'Barlow', sans-serif; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; font-size: 0.85rem; color: var(--primary); }

/* Utility */
.text-center { text-align: center; }
.text-mono { font-family: 'IBM Plex Mono', monospace; }
.mb-0 { margin-bottom: 0; }
.mt-4 { margin-top: 32px; }
.mt-6 { margin-top: 48px; }
.hidden { display: none; }

/* Table (sitemap/methodology) */
.data-table { width: 100%; border-collapse: collapse; }
.data-table th, .data-table td { padding: 14px 16px; text-align: left; border-bottom: 1px solid var(--border); font-size: 0.95rem; }
.data-table th { font-family: 'Barlow', sans-serif; text-transform: uppercase; letter-spacing: 0.1em; font-size: 0.8rem; color: var(--primary); }
.data-table code { font-family: 'IBM Plex Mono', monospace; background: var(--surface-2); padding: 2px 6px; }

/* Toast */
.toast {
  position: fixed; bottom: 24px; right: 24px; z-index: 200;
  padding: 14px 20px;
  background: var(--surface); border: 1px solid var(--primary);
  color: var(--text); font-family: 'IBM Plex Mono', monospace; font-size: 0.85rem;
  box-shadow: 4px 4px 0 var(--primary);
  opacity: 0; transform: translateY(20px); transition: opacity 200ms, transform 200ms;
  pointer-events: none;
}
.toast.show { opacity: 1; transform: translateY(0); }

/* Transparency strip (top of every page) */
.transparency-strip {
  background: color-mix(in srgb, var(--primary) 12%, var(--surface));
  border-bottom: 1px solid color-mix(in srgb, var(--primary) 30%, var(--border));
  padding: 8px 0;
  font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem;
  color: var(--text); text-align: center;
}
.transparency-strip i { color: var(--primary); margin-right: 6px; }
.transparency-strip a { color: var(--primary); text-decoration: underline; margin-left: 6px; }
@media (max-width: 768px) { .transparency-strip { font-size: 0.65rem; padding: 6px 0; } }

/* Search overlay */
.cc-search-overlay {
  position: fixed; inset: 0; z-index: 300; display: none;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(10px);
  padding: 10vh 20px;
}
.cc-search-overlay.open { display: block; }
.cc-search-box {
  max-width: 720px; margin: 0 auto;
  background: var(--surface); border: 1px solid var(--border-strong);
  box-shadow: 12px 12px 0 var(--primary);
}
.cc-search-head { display: flex; align-items: center; gap: 12px; padding: 16px 20px; border-bottom: 1px solid var(--border); }
.cc-search-head i.fa-magnifying-glass { color: var(--primary); font-size: 1.05rem; }
.cc-search-head input { flex: 1; background: transparent; border: none; color: var(--text); font-size: 1.05rem; font-family: 'IBM Plex Sans', sans-serif; outline: none; }
.cc-search-head input::placeholder { color: var(--text-muted); }
.cc-search-results { max-height: 60vh; overflow-y: auto; }
.cc-search-item { display: grid; grid-template-columns: 100px 1fr auto; gap: 16px; align-items: center; padding: 14px 20px; border-bottom: 1px dashed var(--border); text-decoration: none; color: var(--text); transition: background 120ms; }
.cc-search-item:hover { background: color-mix(in srgb, var(--primary) 8%, transparent); color: var(--text); }
.cc-search-tag { font-family: 'IBM Plex Mono', monospace; font-size: 0.65rem; text-transform: uppercase; letter-spacing: 0.2em; color: var(--primary); }
.cc-search-title { font-family: 'Barlow', sans-serif; font-weight: 700; font-size: 0.95rem; }
.cc-search-desc { color: var(--text-muted); font-size: 0.82rem; margin-top: 2px; }
.cc-search-item i { color: var(--primary); }
.cc-search-empty { padding: 40px 20px; text-align: center; color: var(--text-muted); font-family: 'IBM Plex Mono', monospace; font-size: 0.85rem; }
@media (max-width: 600px) { .cc-search-item { grid-template-columns: 1fr; gap: 6px; } .cc-search-item i { display: none; } }

/* Newsletter */
.newsletter-band {
  background: var(--surface); border: 1px solid var(--border-strong);
  padding: 48px; display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center;
  background-image:
    radial-gradient(circle at 90% 10%, color-mix(in srgb, var(--primary) 10%, transparent), transparent 40%),
    repeating-linear-gradient(90deg, transparent 0 39px, var(--border) 39px 40px);
}
@media (max-width: 900px) { .newsletter-band { grid-template-columns: 1fr; padding: 32px; } }
.newsletter-band h2 { margin-bottom: 12px; }
.newsletter-form { display: grid; grid-template-columns: 1fr auto; gap: 12px; }
@media (max-width: 500px) { .newsletter-form { grid-template-columns: 1fr; } }
.newsletter-form input { padding: 14px 16px; background: var(--input-bg); border: 1px solid var(--border-strong); color: var(--text); font-size: 1rem; border-radius: 0; font-family: 'IBM Plex Sans', sans-serif; min-height: 48px; transition: border-color var(--dur-fast), box-shadow var(--dur-fast); }
.newsletter-form input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 25%, transparent); }
.newsletter-msg { margin-top: 12px; padding: 10px 14px; font-family: 'IBM Plex Mono', monospace; font-size: 0.8rem; border: 1px solid transparent; }
.newsletter-msg.success { color: var(--success); border-color: var(--success); background: color-mix(in srgb, var(--success) 10%, transparent); }
.newsletter-msg.error { color: var(--danger); border-color: var(--danger); background: color-mix(in srgb, var(--danger) 10%, transparent); }

/* Construction Intelligence Panel */
.intel-panel {
  border: 2px solid var(--primary);
  background: var(--card);
  padding: 32px;
  margin-top: 32px;
  box-shadow: 6px 6px 0 color-mix(in srgb, var(--primary) 60%, transparent);
}
.intel-panel .intel-head { display: flex; justify-content: space-between; align-items: baseline; gap: 20px; margin-bottom: 20px; padding-bottom: 16px; border-bottom: 1px dashed var(--border-strong); flex-wrap: wrap; }
.intel-panel .intel-eyebrow { font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; letter-spacing: 0.24em; color: var(--primary); text-transform: uppercase; }
.intel-panel h3 { font-family: 'Barlow', sans-serif; text-transform: uppercase; margin-top: 6px; }
.intel-panel .intel-trust { font-family: 'IBM Plex Mono', monospace; font-size: 0.7rem; color: var(--text-muted); letter-spacing: 0.15em; text-transform: uppercase; }
.intel-panel .intel-trust b { color: var(--primary); }
.intel-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 0; border-top: 1px dashed var(--border); border-left: 1px dashed var(--border); }
.intel-cell { border-right: 1px dashed var(--border); border-bottom: 1px dashed var(--border); padding: 18px; }
.intel-cell .k { font-family: 'IBM Plex Mono', monospace; font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.18em; color: var(--text-muted); }
.intel-cell .v { font-family: 'Barlow', sans-serif; font-weight: 900; font-size: 1.5rem; color: var(--primary); margin-top: 4px; }
.intel-cell .s { font-family: 'IBM Plex Mono', monospace; font-size: 0.7rem; color: var(--text-muted); margin-top: 4px; }
.intel-section { margin-top: 24px; }
.intel-section h4 { font-family: 'Barlow', sans-serif; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 12px; color: var(--text); font-size: 0.95rem; }
.intel-section h4 i { color: var(--primary); margin-right: 8px; }
.intel-bar { display: flex; height: 26px; border: 1px solid var(--border); overflow: hidden; }
.intel-bar-seg { display: flex; align-items: center; justify-content: center; font-family: 'IBM Plex Mono', monospace; font-size: 0.7rem; color: #000; }
.intel-legend { display: flex; gap: 20px; margin-top: 10px; flex-wrap: wrap; font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; color: var(--text-muted); }
.intel-legend span { display: inline-flex; align-items: center; gap: 6px; }
.intel-legend .dot { width: 10px; height: 10px; display: inline-block; }
.intel-convert-table { width: 100%; border-collapse: collapse; margin-top: 8px; }
.intel-convert-table th, .intel-convert-table td { text-align: left; padding: 8px 10px; border-bottom: 1px dashed var(--border); font-size: 0.9rem; color: var(--text); }
.intel-convert-table th { font-family: 'Barlow', sans-serif; text-transform: uppercase; letter-spacing: 0.1em; font-size: 0.72rem; color: var(--primary); }
.intel-cta { margin-top: 24px; display: flex; gap: 12px; flex-wrap: wrap; padding-top: 20px; border-top: 1px dashed var(--border-strong); }

/* Global stat strip variant */
.globe-strip {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--primary) 4%, var(--surface));
}
.globe-strip .cell { padding: 32px 20px; border-right: 1px dashed var(--border); text-align: center; }
.globe-strip .cell:last-child { border-right: none; }
.globe-strip .n { font-family: 'Barlow', sans-serif; font-weight: 900; font-size: 2.4rem; color: var(--primary); line-height: 1; }
.globe-strip .l { font-family: 'IBM Plex Mono', monospace; font-size: 0.7rem; color: var(--text-muted); letter-spacing: 0.2em; text-transform: uppercase; margin-top: 6px; }

/* Project Completion Panel */
.pc-panel { border: 1px solid var(--border); background: var(--card); padding: 28px; margin-top: 32px; }
.pc-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; margin-bottom: 20px; padding-bottom: 16px; border-bottom: 1px dashed var(--border-strong); flex-wrap: wrap; }
.pc-eyebrow { font-family: 'IBM Plex Mono', monospace; font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.24em; color: var(--primary); }
.pc-panel h3 { font-family: 'Barlow', sans-serif; text-transform: uppercase; margin-top: 4px; }
.pc-percent { text-align: right; }
.pc-percent-num { font-family: 'Barlow', sans-serif; font-weight: 900; font-size: 3rem; color: var(--primary); line-height: 1; }
.pc-percent-lbl { font-size: 0.72rem; letter-spacing: 0.2em; color: var(--text-muted); text-transform: uppercase; margin-top: 4px; }
.pc-bar { width: 100%; height: 12px; background: var(--surface-2); border: 1px solid var(--border); overflow: hidden; }
.pc-bar-fill { height: 100%; background: linear-gradient(90deg, var(--primary), color-mix(in srgb, var(--primary) 80%, var(--accent))); transition: width 250ms ease; }
.pc-note { font-family: 'IBM Plex Mono', monospace; font-size: 0.68rem; color: var(--text-muted); margin-top: 10px; }
.pc-groups { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 20px; }
@media (max-width: 700px) { .pc-groups { grid-template-columns: 1fr; } .pc-percent { text-align: left; } }
.pc-group { border: 1px dashed var(--border); padding: 16px; }
.pc-group-head { display: flex; justify-content: space-between; align-items: baseline; padding-bottom: 8px; border-bottom: 1px dashed var(--border); margin-bottom: 10px; }
.pc-group-title { font-family: 'Barlow', sans-serif; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; font-size: 0.85rem; color: var(--text); }
.pc-group-count { font-family: 'IBM Plex Mono', monospace; font-size: 0.75rem; color: var(--primary); }
.pc-fields { list-style: none; padding: 0; margin: 0; }
.pc-fields li { padding: 6px 0; font-size: 0.88rem; color: var(--text-muted); display: flex; align-items: center; gap: 8px; }
.pc-fields li.ok { color: var(--text); }
.pc-fields li.ok i { color: var(--success); }
.pc-fields li.todo i { color: var(--border-strong); }

/* Report header (only rendered when printing) */
.report-meta {
  display: none;
  border: 2px solid var(--primary);
  padding: 20px 24px;
  margin: 0 0 24px;
  background: var(--card);
}
.report-meta .row { display: flex; justify-content: space-between; gap: 20px; padding: 6px 0; border-bottom: 1px dashed var(--border); flex-wrap: wrap; }
.report-meta .row:last-child { border-bottom: none; }
.report-meta .k { font-family: 'IBM Plex Mono', monospace; font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.15em; color: var(--text-muted); }
.report-meta .v { font-family: 'Barlow', sans-serif; font-weight: 700; color: var(--text); }
.report-meta h2 { margin-bottom: 12px; }
.report-disclaimer { margin-top: 24px; padding: 20px; border: 1px dashed var(--border-strong); font-family: 'IBM Plex Sans', sans-serif; font-size: 0.85rem; color: var(--text-muted); display: none; }
.report-disclaimer strong { color: var(--text); }

/* PRINT stylesheet — client-ready report */
@media print {
  body::before { display: none !important; }
  .transparency-strip, .site-header, .site-footer, .marquee, .cc-search-overlay, .breadcrumb, .ad-slot, .cta-band, .nav-actions, .btn, .save-options, .calculator-navigation, .icon-btn, #calculator-app .tabs { display: none !important; }
  .report-meta, .report-disclaimer { display: block !important; }
  #calculator-app .tab-content { display: block !important; break-inside: avoid; }
  #calculator-app .tab-content:not(#summary) { display: none !important; }
  body { background: #fff !important; color: #000 !important; }
  * { color: #000 !important; background: #fff !important; border-color: #444 !important; box-shadow: none !important; }
  .intel-panel, .pc-panel { border: 2px solid #000 !important; box-shadow: none !important; }
  .intel-cell, .pc-group { border-color: #999 !important; }
  .intel-cell .v, .intel-eyebrow, .pc-eyebrow, .pc-group-count, .pc-percent-num { color: #000 !important; }
  .intel-bar-seg { color: #000 !important; }
  .container { max-width: 100% !important; padding: 0 !important; }
  h1, h2, h3, h4 { color: #000 !important; }
  a { text-decoration: underline; color: #000 !important; }
  table { page-break-inside: avoid; }
  .page-header { padding: 0 0 20px 0 !important; background: none !important; }
}


/* --- Professional Report Modal --- */
.cc-report-modal { position: fixed; inset: 0; background: color-mix(in srgb, #000 82%, transparent); z-index: 900; display: none; padding: 24px; overflow-y: auto; }
.cc-report-modal.open { display: block; }
.cc-report-box { max-width: 720px; margin: 40px auto; background: var(--surface); border: 1px solid var(--border-strong); box-shadow: 12px 12px 0 var(--primary); padding: 28px; position: relative; }
.cc-report-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; margin-bottom: 8px; }
.cc-report-eyebrow { font-family: 'IBM Plex Mono', monospace; font-size: 0.7rem; letter-spacing: 0.22em; color: var(--primary); text-transform: uppercase; }
.cc-report-box h3 { font-family: 'Barlow', sans-serif; font-weight: 900; text-transform: uppercase; margin-top: 6px; letter-spacing: 0.02em; }
.cc-report-note { color: var(--text-muted); font-size: 0.88rem; margin: 4px 0 20px; }
.cc-report-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin-bottom: 20px; }
.cc-report-btn { background: var(--card); color: var(--text); border: 1px dashed var(--border-strong); padding: 18px 14px; text-align: left; cursor: pointer; display: flex; flex-direction: column; gap: 6px; transition: all 150ms; font-family: inherit; }
.cc-report-btn:hover { border-color: var(--primary); background: color-mix(in srgb, var(--primary) 10%, var(--card)); transform: translate(-2px, -2px); box-shadow: 4px 4px 0 var(--primary); }
.cc-report-btn i { color: var(--primary); font-size: 1.6rem; }
.cc-report-btn span { font-family: 'Barlow', sans-serif; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; font-size: 1.05rem; color: var(--text); }
.cc-report-btn small { font-family: 'IBM Plex Mono', monospace; font-size: 0.7rem; color: var(--text-muted); }
.cc-report-foot { padding-top: 14px; border-top: 1px dashed var(--border); color: var(--text-muted); font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; }
.cc-report-consent {
  display: flex; gap: 12px; align-items: flex-start;
  margin: 8px 0 20px;
  padding: 14px 16px;
  background: color-mix(in srgb, var(--primary) 6%, transparent);
  border: 1px dashed color-mix(in srgb, var(--primary) 40%, var(--border));
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 0.86rem;
  color: var(--text);
  cursor: pointer;
  line-height: 1.4;
}
.cc-report-consent input[type="checkbox"] {
  margin-top: 3px;
  width: 16px; height: 16px;
  accent-color: var(--primary);
  cursor: pointer;
  flex-shrink: 0;
}
.cc-report-consent strong { color: var(--primary); }

/* --- Save Project Panel --- */
.sp-panel { border: 1px solid var(--border); background: var(--card); padding: 28px; margin-top: 32px; }
.sp-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; margin-bottom: 20px; padding-bottom: 16px; border-bottom: 1px dashed var(--border-strong); flex-wrap: wrap; }
.sp-eyebrow { font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; letter-spacing: 0.24em; color: var(--primary); text-transform: uppercase; }
.sp-panel h3 { font-family: 'Barlow', sans-serif; text-transform: uppercase; margin-top: 6px; }
.sp-note { max-width: 380px; color: var(--text-muted); font-size: 0.75rem; letter-spacing: 0.06em; }
.sp-note code { background: var(--surface-2); padding: 2px 6px; color: var(--primary); font-size: 0.75rem; }
.sp-form { display: flex; align-items: end; gap: 12px; flex-wrap: wrap; margin-bottom: 16px; }
.sp-form label { font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; letter-spacing: 0.18em; color: var(--text-muted); text-transform: uppercase; display: block; margin-bottom: 4px; }
.sp-form input[type="text"] { min-width: 260px; flex: 1; background: var(--surface); color: var(--text); border: 1px solid var(--border); padding: 10px 12px; font-family: inherit; font-size: 0.95rem; }
.sp-form input[type="text"]:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 25%, transparent); }
.sp-sep { display: inline-block; width: 1px; height: 22px; background: var(--border); margin: 0 6px; }
.sp-list { display: flex; flex-direction: column; gap: 12px; margin-top: 8px; }
.sp-empty { padding: 24px; text-align: center; border: 1px dashed var(--border); }
.sp-row { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 14px 16px; border: 1px solid var(--border); background: var(--surface); flex-wrap: wrap; }
.sp-row:hover { border-color: var(--primary); }
.sp-row-main { min-width: 0; flex: 1; }
.sp-row-name { font-family: 'Barlow', sans-serif; font-weight: 700; font-size: 1.05rem; color: var(--text); }
.sp-row-meta { font-size: 0.75rem; color: var(--text-muted); margin-top: 4px; }
.sp-row-meta b { color: var(--primary); }
.sp-row-actions { display: flex; gap: 6px; flex-wrap: wrap; }
.sp-row-actions .btn { padding: 6px 10px; font-size: 0.8rem; }
.btn.btn-danger { background: var(--danger); color: #fff; border-color: var(--danger); }

@media (max-width: 700px) { .sp-row { flex-direction: column; align-items: stretch; } .sp-form input[type="text"] { min-width: 0; width: 100%; } .cc-report-box { padding: 20px; } }

@media print {
  .cc-report-modal, .sp-panel { display: none !important; }
}


/* ========================================================================
   Professional Toast System
   ======================================================================== */
.cc-toast-container {
  position: fixed;
  top: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 12px;
  pointer-events: none;
  max-width: min(420px, calc(100vw - 32px));
}
.cc-toast {
  pointer-events: auto;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: start;
  gap: 12px;
  padding: 14px 16px 18px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-left: 4px solid var(--primary);
  color: var(--text);
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 0.92rem;
  line-height: 1.4;
  box-shadow: 0 8px 24px rgba(0,0,0,0.35), 4px 4px 0 rgba(255, 184, 0, 0.15);
  border-radius: 0;
  opacity: 0;
  transform: translateX(24px);
  transition: opacity 220ms ease, transform 220ms ease;
  position: relative;
  overflow: hidden;
}
.cc-toast--in { opacity: 1; transform: translateX(0); }
.cc-toast--out { opacity: 0; transform: translateX(24px); }
.cc-toast__icon {
  color: var(--primary);
  font-size: 1.1rem;
  margin-top: 2px;
}
.cc-toast__msg {
  word-break: break-word;
  padding-right: 4px;
}
.cc-toast__close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 2px 6px;
  font-size: 0.9rem;
  transition: color 120ms;
}
.cc-toast__close:hover { color: var(--text); }
.cc-toast__bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: rgba(255,255,255,0.06);
}
.cc-toast__bar > span {
  display: block;
  height: 100%;
  width: 100%;
  background: var(--primary);
  transition: none;
}
.cc-toast--success { border-left-color: #10b981; }
.cc-toast--success .cc-toast__icon { color: #10b981; }
.cc-toast--success .cc-toast__bar > span { background: #10b981; }
.cc-toast--error { border-left-color: var(--danger, #ef4444); }
.cc-toast--error .cc-toast__icon { color: var(--danger, #ef4444); }
.cc-toast--error .cc-toast__bar > span { background: var(--danger, #ef4444); }
.cc-toast--info { border-left-color: #3b82f6; }
.cc-toast--info .cc-toast__icon { color: #3b82f6; }
.cc-toast--info .cc-toast__bar > span { background: #3b82f6; }
.cc-toast--warning { border-left-color: #f59e0b; }
.cc-toast--warning .cc-toast__icon { color: #f59e0b; }
.cc-toast--warning .cc-toast__bar > span { background: #f59e0b; }

[data-theme="light"] .cc-toast {
  background: #ffffff;
  color: #111;
  box-shadow: 0 10px 30px rgba(0,0,0,0.12), 4px 4px 0 rgba(255,184,0,0.2);
}
[data-theme="light"] .cc-toast__close { color: #6b7280; }
[data-theme="light"] .cc-toast__close:hover { color: #111; }

@media (max-width: 600px) {
  .cc-toast-container { top: 12px; right: 12px; left: 12px; max-width: none; }
  .cc-toast { font-size: 0.88rem; padding: 12px 14px 16px; }
}

@media print {
  .cc-toast-container { display: none !important; }
}


/* ========================================================================
   Knowledge Center & Formula Library — hub search + filter chips
   ======================================================================== */
.kc-controls { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; margin-bottom: 24px; }
.kc-controls input[type="search"] {
  flex: 1;
  min-width: 260px;
  padding: 12px 16px;
  background: var(--surface, transparent);
  border: 1px solid var(--border-strong);
  color: var(--text);
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 0.95rem;
  border-radius: 0;
}
.kc-controls input[type="search"]:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 1px var(--primary);
}
.kc-controls input[type="search"]::placeholder { color: var(--text-muted); }
[data-theme="dark"] .kc-controls input[type="search"] { background: var(--surface-2, #1a1a1e); color: var(--text); }
[data-theme="light"] .kc-controls input[type="search"] { background: #ffffff; color: #09090b; }

.kc-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.kc-chip {
  padding: 8px 14px;
  background: transparent;
  border: 1px solid var(--border-strong);
  color: var(--text-muted);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  cursor: pointer;
  border-radius: 0;
  transition: color 140ms, border-color 140ms, background 140ms;
}
.kc-chip:hover { color: var(--text); border-color: var(--primary); }
.kc-chip.active {
  color: #0a0a0a;
  background: var(--primary);
  border-color: var(--primary);
  font-weight: 700;
}
[data-theme="light"] .kc-chip.active { color: #0a0a0a; }

.kc-empty {
  padding: 40px;
  text-align: center;
  color: var(--text-muted);
  border: 1px dashed var(--border);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.85rem;
}

.kc-card {
  display: flex;
  flex-direction: column;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  transition: border-color var(--dur-fast),
              transform var(--dur-med) var(--ease-out),
              box-shadow var(--dur-med) var(--ease-out),
              background-color var(--dur-fast);
  will-change: transform;
}
.kc-card:hover {
  border-color: var(--primary);
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 color-mix(in srgb, var(--primary) 70%, transparent);
  background: color-mix(in srgb, var(--primary) 2%, var(--surface));
}
.kc-card .meta {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--primary);
  margin-bottom: 8px;
}

/* ========================================================================
   Phase-4 · Popular Calculators — URL intent pulse highlight
   ======================================================================== */
@keyframes cc-intent-pulse-kf {
  0%   { box-shadow: 0 0 0 0 rgba(255, 184, 0, 0.55); background-color: color-mix(in srgb, var(--primary, #FFB800) 12%, transparent); }
  70%  { box-shadow: 0 0 0 10px rgba(255, 184, 0, 0); background-color: color-mix(in srgb, var(--primary, #FFB800) 3%, transparent); }
  100% { box-shadow: 0 0 0 0 rgba(255, 184, 0, 0); background-color: transparent; }
}
.cc-intent-pulse {
  animation: cc-intent-pulse-kf 1.8s ease-out;
  outline: 2px solid var(--primary, #FFB800);
  outline-offset: 4px;
  transition: outline-color 400ms ease-out;
  scroll-margin-top: 90px;
}
@media (prefers-reduced-motion: reduce) {
  .cc-intent-pulse { animation: none; }
}
.kc-card h3 {
  font-family: 'Barlow', sans-serif;
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--text);
  margin: 0 0 10px;
  text-transform: none;
  letter-spacing: 0;
}
.kc-card p {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin: 0 0 14px;
  flex: 1;
}
.kc-card .read-more {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--primary);
}

/* ========================================================================
   Iter 13 · Modernization polish — loading skeletons, refined focus, motion
   ======================================================================== */

/* Loading skeleton for async KC/Formula hubs */
.cc-skeleton {
  background: linear-gradient(
    90deg,
    var(--surface-2) 0%,
    color-mix(in srgb, var(--primary) 6%, var(--surface-2)) 50%,
    var(--surface-2) 100%
  );
  background-size: 200% 100%;
  animation: cc-skeleton-shimmer 1.4s ease-in-out infinite;
  border: 1px solid var(--border);
  min-height: 140px;
  border-radius: 0;
}
@keyframes cc-skeleton-shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
@media (prefers-reduced-motion: reduce) {
  .cc-skeleton { animation: none; }
}

/* Entrance animations — subtle fade-up for hero blocks (opt-in via .fade-up) */
.fade-up {
  opacity: 0;
  transform: translateY(12px);
  animation: cc-fade-up 600ms var(--ease-out) forwards;
}
.fade-up-d1 { animation-delay: 80ms; }
.fade-up-d2 { animation-delay: 160ms; }
.fade-up-d3 { animation-delay: 240ms; }
@keyframes cc-fade-up {
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .fade-up { opacity: 1; transform: none; animation: none; }
}

/* Refined selection */
::selection { background: var(--primary); color: #000; }

/* Refined scrollbar (webkit) */
::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb {
  background: var(--surface-2);
  border: 3px solid var(--bg);
  border-radius: 0;
}
::-webkit-scrollbar-thumb:hover { background: var(--primary); }

/* Firefox scrollbar */
* { scrollbar-color: var(--surface-2) var(--bg); scrollbar-width: thin; }

/* Better link-underline on prose (accessibility) */
.prose a { text-decoration-thickness: 2px; text-underline-offset: 3px; }
.prose a:hover { text-decoration-thickness: 3px; }

/* Nav link — animated bottom border */
.nav-links a {
  transition: color var(--dur-fast);
}
.nav-links a::after {
  content: '';
  position: absolute;
  left: 12px; right: 12px; bottom: 2px;
  height: 2px;
  background: var(--primary);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur-med) var(--ease-out);
}
.nav-links a:hover::after { transform: scaleX(1); }
.nav-links a.active::after { transform: scaleX(1); }

/* Mobile nav — smoother drawer */
@media (max-width: 1024px) {
  .nav-links a::after { display: none; }
  .nav-links.open {
    animation: cc-drawer-slide 260ms var(--ease-out);
  }
}
@keyframes cc-drawer-slide {
  0%   { opacity: 0; transform: translateY(-8px); }
  100% { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .nav-links.open { animation: none; }
}

/* Improved dark-mode toggle icon */
.icon-btn i { transition: transform var(--dur-med) var(--ease-out); }
.icon-btn:hover i { transform: rotate(-12deg) scale(1.1); }

/* Ensure buttons and links have min tap target on mobile */
@media (max-width: 768px) {
  .btn, .icon-btn { min-height: 44px; min-width: 44px; }
  .nav-links a { min-height: 44px; display: flex; align-items: center; }
}

/* Hero — subtle entrance animation for h1 */
.hero h1 { animation: cc-hero-fade 700ms var(--ease-out); }
.hero p.lead { animation: cc-hero-fade 700ms var(--ease-out) 120ms both; }
.hero-cta { animation: cc-hero-fade 700ms var(--ease-out) 200ms both; }
.hero-meta { animation: cc-hero-fade 700ms var(--ease-out) 280ms both; }
@keyframes cc-hero-fade {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .hero h1, .hero p.lead, .hero-cta, .hero-meta { animation: none; }
}

/* Data-table hover polish */
.data-table tr { transition: background-color var(--dur-fast); }
.data-table tbody tr:hover { background: color-mix(in srgb, var(--primary) 5%, transparent); }

/* Improved dropdown animation */
.dropdown {
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
}
.has-menu:hover .dropdown,
.has-menu:focus-within .dropdown {
  opacity: 1;
  transform: translateY(0);
}

/* WCAG AA — ensure form message text has enough contrast */
.form .msg.error, .newsletter-msg.error {
  font-weight: 500;
}

/* Print — hide skip-to-content */
@media print {
  .skip-to-content { display: none !important; }
  .fade-up, .hero h1, .hero p.lead, .hero-cta, .hero-meta { animation: none !important; opacity: 1 !important; transform: none !important; }
}