/* METRIC MECH — Shared Design System
   Matches CadNexa's editorial-industrial aesthetic */

:root {
  --ink: #0B0F14;
  --ink-2: #141A22;
  --ink-3: #1C242E;
  --paper: #F5F2EC;
  --paper-2: #EAE5DB;
  --paper-3: #DFD9C9;
  --rule: #D6CFBE;
  --rule-strong: #B8B0A0;
  --blueprint: #1E4D8F;
  --blueprint-light: #3A6FB8;
  --blueprint-tint: #E8EEF7;
  --amber: #E8A733;
  --amber-tint: #FBF1DA;
  --alert: #C64B2A;
  --ok: #2E7D4F;
  --mute: #6B6558;

  --display: 'Fraunces', Georgia, serif;
  --body: 'Inter Tight', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;

  --rad: 2px;
  --rad-lg: 4px;
  --max-w: 1280px;
  --max-w-prose: 720px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: var(--blueprint); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

.grid-bg {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    linear-gradient(rgba(30,77,143,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30,77,143,0.025) 1px, transparent 1px);
  background-size: 32px 32px;
}
main, header, footer, section, article { position: relative; z-index: 2; }

/* Notice bar */
.notice-bar {
  background: var(--ink); color: var(--paper);
  font-size: 13px; padding: 9px 24px; text-align: center;
}
.notice-bar a { color: var(--amber); text-decoration: underline; text-underline-offset: 3px; font-weight: 500; }

/* Header */
.site-header {
  background: rgba(245,242,236,0.95);
  border-bottom: 1px solid var(--rule);
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(8px);
}
.header-inner {
  max-width: var(--max-w); margin: 0 auto;
  padding: 18px 32px;
  display: flex; align-items: center; justify-content: space-between; gap: 32px;
}
.brand-link { display: flex; align-items: baseline; gap: 12px; text-decoration: none; }
.brand-link:hover { text-decoration: none; }
.brand-name {
  font-family: var(--display); font-weight: 700; font-size: 22px;
  letter-spacing: -0.01em; color: var(--ink);
}
.brand-name em { font-style: italic; color: var(--blueprint); font-weight: 500; }
.brand-tag {
  font-family: var(--mono); font-size: 10px; color: var(--mute);
  text-transform: uppercase; letter-spacing: 0.12em;
}
.header-search { flex: 1; max-width: 420px; position: relative; }
.header-search input {
  width: 100%; padding: 9px 14px 9px 36px;
  font-family: var(--body); font-size: 13px;
  border: 1px solid var(--rule-strong); background: var(--paper-2);
  border-radius: var(--rad); outline: none;
  transition: border-color 0.2s, background 0.2s;
}
.header-search input:focus { border-color: var(--blueprint); background: var(--paper); }
.header-search::before {
  content: '⌕'; position: absolute; left: 12px; top: 50%;
  transform: translateY(-50%); font-size: 16px; color: var(--mute);
}
.header-nav { display: flex; gap: 22px; font-size: 14px; font-weight: 500; }
.header-nav a { color: var(--ink-2); text-decoration: none; }
.header-nav a:hover { color: var(--blueprint); text-decoration: underline; text-underline-offset: 4px; }
.header-nav a.current { color: var(--blueprint); border-bottom: 2px solid var(--blueprint); padding-bottom: 2px; }

@media (max-width: 980px) {
  .header-inner { flex-wrap: wrap; gap: 14px; }
  .header-search { order: 3; max-width: 100%; }
  .header-nav { gap: 14px; font-size: 13px; flex-wrap: wrap; }
  .brand-tag { display: none; }
}

/* Page header */
.page-header {
  max-width: var(--max-w); margin: 0 auto;
  padding: 48px 32px 32px;
  border-bottom: 1px solid var(--rule);
}
.breadcrumb {
  font-family: var(--mono); font-size: 11px; color: var(--mute);
  text-transform: uppercase; letter-spacing: 0.12em; margin-bottom: 16px;
}
.breadcrumb a { color: var(--mute); }
.breadcrumb a:hover { color: var(--blueprint); }
.breadcrumb .sep { margin: 0 8px; opacity: 0.5; }
.page-title {
  font-family: var(--display); font-weight: 600;
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.05; letter-spacing: -0.02em;
  color: var(--ink); margin-bottom: 16px;
}
.page-title em { font-style: italic; color: var(--blueprint); font-weight: 500; }
.page-lede {
  font-size: 18px; line-height: 1.55;
  color: var(--ink-2); max-width: 720px;
}

/* Sections */
.section { max-width: var(--max-w); margin: 0 auto; padding: 56px 32px; }
.section-divider { border-bottom: 1px solid var(--rule); }
.section-head {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: 28px; padding-bottom: 14px;
  border-bottom: 2px solid var(--ink);
  flex-wrap: wrap; gap: 12px;
}
.section-label {
  font-family: var(--mono); font-size: 11px; text-transform: uppercase;
  letter-spacing: 0.16em; color: var(--blueprint);
  margin-bottom: 16px;
  display: flex; align-items: center; gap: 10px;
}
.section-label::before {
  content: ''; width: 24px; height: 1px; background: var(--blueprint);
}
.section-head h2 {
  font-family: var(--display); font-weight: 600; font-size: 28px;
  letter-spacing: -0.01em; color: var(--ink);
}
.section-head h2 em { font-style: italic; color: var(--blueprint); font-weight: 500; }
.all-link {
  font-size: 13px; font-weight: 500; color: var(--blueprint);
  text-decoration: none;
}
.all-link:hover { text-decoration: underline; text-underline-offset: 3px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--body); font-size: 14px; font-weight: 600;
  padding: 11px 18px;
  border: 1px solid var(--ink); background: var(--ink); color: var(--paper);
  cursor: pointer; border-radius: var(--rad);
  transition: transform 0.15s, box-shadow 0.15s;
  letter-spacing: 0.01em; text-decoration: none;
}
.btn:hover { transform: translate(-2px, -2px); box-shadow: 4px 4px 0 var(--ink); text-decoration: none; }
.btn-amber { background: var(--amber); border-color: var(--ink); color: var(--ink); }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--paper); }
.btn-lg { font-size: 15px; padding: 14px 22px; }
.btn-sm { font-size: 12px; padding: 8px 14px; }

/* Cards */
.card {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: var(--rad-lg);
  padding: 24px;
  text-decoration: none; color: inherit; display: block;
  transition: border-color 0.2s, transform 0.15s, box-shadow 0.15s;
}
.card:hover {
  border-color: var(--ink);
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--ink);
  text-decoration: none;
}

/* Tags */
.tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--mono); font-size: 10px;
  text-transform: uppercase; letter-spacing: 0.1em;
  padding: 3px 8px; background: var(--paper-2); color: var(--ink-2);
  border: 1px solid var(--rule); border-radius: var(--rad);
}

/* CadNexa Promo - Sidebar Card */
.cn-promo-card {
  background: var(--ink); color: var(--paper);
  border-radius: var(--rad-lg);
  padding: 28px 24px;
  position: relative; overflow: hidden;
}
.cn-promo-card::before {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(232,167,51,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232,167,51,0.05) 1px, transparent 1px);
  background-size: 18px 18px; pointer-events: none;
}
.cn-promo-card > * { position: relative; }
.cn-promo-eyebrow {
  font-family: var(--mono); font-size: 10px; color: var(--amber);
  text-transform: uppercase; letter-spacing: 0.14em; margin-bottom: 14px;
}
.cn-promo-card h3 {
  font-family: var(--display); font-weight: 600;
  font-size: 22px; line-height: 1.2; margin-bottom: 12px;
  letter-spacing: -0.01em; color: var(--paper);
}
.cn-promo-card h3 em { font-style: italic; color: var(--amber); font-weight: 500; }
.cn-promo-card p {
  font-size: 14px; line-height: 1.55; margin-bottom: 18px; opacity: 0.85;
}
.cn-promo-cta {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--amber); color: var(--ink);
  font-weight: 600; font-size: 13px; padding: 10px 16px;
  border-radius: var(--rad); text-decoration: none;
  transition: transform 0.15s;
}
.cn-promo-cta:hover { text-decoration: none; color: var(--ink); transform: translateY(-1px); }
.cn-promo-foot {
  font-family: var(--mono); font-size: 10px;
  color: rgba(245,242,236,0.5); text-transform: uppercase; letter-spacing: 0.1em;
  margin-top: 14px; padding-top: 12px;
  border-top: 1px solid rgba(245,242,236,0.1);
}

/* Inline banner */
.cn-inline-banner {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--amber);
  border-radius: var(--rad);
  padding: 18px 22px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px; margin: 32px 0; flex-wrap: wrap;
}
.cn-inline-banner-text { flex: 1; min-width: 280px; }
.cn-inline-banner-text strong {
  font-family: var(--display); font-weight: 600; font-size: 16px;
  color: var(--ink); display: block; margin-bottom: 4px;
}
.cn-inline-banner-text strong em { font-style: italic; color: var(--blueprint); font-weight: 500; }
.cn-inline-banner-text span { font-size: 13px; color: var(--mute); }

/* Big banner */
.cn-big-banner { max-width: var(--max-w); margin: 32px auto; padding: 0 32px; }
.cn-big-banner-inner {
  background: var(--ink); color: var(--paper);
  border-radius: var(--rad-lg);
  padding: 44px 48px;
  display: grid; grid-template-columns: 1fr auto;
  gap: 40px; align-items: center;
  position: relative; overflow: hidden;
}
.cn-big-banner-inner::before {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(232,167,51,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232,167,51,0.04) 1px, transparent 1px);
  background-size: 28px 28px; pointer-events: none;
}
.cn-big-banner-inner > * { position: relative; z-index: 1; }
.cn-big-eyebrow {
  font-family: var(--mono); font-size: 11px; color: var(--amber);
  text-transform: uppercase; letter-spacing: 0.14em; margin-bottom: 12px;
}
.cn-big-banner h2 {
  font-family: var(--display); font-weight: 600; font-size: 30px;
  line-height: 1.15; letter-spacing: -0.01em; margin-bottom: 12px;
}
.cn-big-banner h2 em { font-style: italic; color: var(--amber); font-weight: 500; }
.cn-big-banner p {
  font-size: 15px; line-height: 1.55; opacity: 0.85; max-width: 560px;
}
.cn-big-cta { display: flex; flex-direction: column; align-items: flex-end; gap: 8px; }
.cn-big-cta span {
  font-family: var(--mono); font-size: 10px; color: rgba(245,242,236,0.5);
  text-transform: uppercase; letter-spacing: 0.1em;
}
@media (max-width: 800px) {
  .cn-big-banner-inner { grid-template-columns: 1fr; padding: 32px 28px; gap: 20px; }
  .cn-big-cta { align-items: flex-start; }
}

/* Footer */
.site-footer {
  background: var(--ink);
  color: rgba(245,242,236,0.7);
  padding: 56px 32px 26px;
  font-size: 13px; margin-top: 64px;
}
.footer-inner {
  max-width: var(--max-w); margin: 0 auto;
  display: grid; grid-template-columns: 1.8fr 1fr 1fr 1fr 1fr;
  gap: 36px;
  padding-bottom: 32px; border-bottom: 1px solid var(--ink-3);
}
.footer-brand {
  font-family: var(--display); font-size: 22px; font-weight: 600;
  color: var(--paper); margin-bottom: 10px; letter-spacing: -0.01em;
}
.footer-brand em { font-style: italic; color: var(--amber); font-weight: 500; }
.footer-about { font-size: 13px; line-height: 1.55; margin-bottom: 16px; }
.footer-supported {
  font-family: var(--mono); font-size: 10px;
  text-transform: uppercase; letter-spacing: 0.1em;
  color: rgba(245,242,236,0.4);
}
.footer-supported a { color: var(--amber); text-decoration: none; font-weight: 600; }
.footer-col h5 {
  font-family: var(--mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: 0.14em;
  color: var(--amber); margin-bottom: 14px; font-weight: 600;
}
.footer-col a {
  display: block; padding: 4px 0;
  color: rgba(245,242,236,0.7);
  font-size: 13px; text-decoration: none;
}
.footer-col a:hover { color: var(--paper); text-decoration: underline; }
.footer-bottom {
  max-width: var(--max-w); margin: 0 auto;
  padding-top: 22px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font-family: var(--mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: 0.08em;
  color: rgba(245,242,236,0.4);
}
@media (max-width: 900px) { .footer-inner { grid-template-columns: 1fr 1fr; } }

/* Animations */
.fade-up {
  opacity: 0; transform: translateY(20px);
  animation: fadeUp 0.6s ease forwards;
}
.fade-up.d1 { animation-delay: 0.08s; }
.fade-up.d2 { animation-delay: 0.16s; }
.fade-up.d3 { animation-delay: 0.24s; }
@keyframes fadeUp { to { opacity: 1; transform: translateY(0); } }

/* Common grids */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

@media (max-width: 1100px) { .grid-4 { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 900px) { .grid-3 { grid-template-columns: repeat(2, 1fr); } .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; } }

/* Calculator card icon */
.icon-32 { width: 32px; height: 32px; color: var(--amber); margin-bottom: 14px; }
.icon-32 svg { width: 100%; height: 100%; }

/* Article styling */
.article-prose {
  max-width: var(--max-w-prose);
  font-family: var(--display);
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink-2);
}
.article-prose h2 {
  font-family: var(--display); font-weight: 600; font-size: 28px;
  letter-spacing: -0.01em; color: var(--ink);
  margin-top: 40px; margin-bottom: 16px;
  line-height: 1.2;
}
.article-prose h3 {
  font-family: var(--display); font-weight: 600; font-size: 22px;
  letter-spacing: -0.01em; color: var(--ink);
  margin-top: 32px; margin-bottom: 12px;
}
.article-prose p { margin-bottom: 18px; }
.article-prose ul, .article-prose ol { margin: 0 0 18px 24px; }
.article-prose li { margin-bottom: 8px; }
.article-prose strong { color: var(--ink); font-weight: 600; }
.article-prose em { font-style: italic; }
.article-prose code {
  font-family: var(--mono); font-size: 14px;
  background: var(--paper-2); padding: 2px 6px;
  border-radius: var(--rad);
}
.article-prose blockquote {
  border-left: 3px solid var(--amber);
  padding: 8px 0 8px 20px;
  margin: 24px 0;
  font-style: italic;
  color: var(--ink-2);
}

/* Table styles */
.ref-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--body);
  font-size: 14px;
  margin: 20px 0;
}
.ref-table th {
  background: var(--ink); color: var(--paper);
  font-family: var(--mono); font-size: 11px;
  font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 10px 12px; text-align: left;
}
.ref-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
}
.ref-table tr:nth-child(even) td { background: var(--paper-2); }

/* Form inputs for calculators */
.calc-input {
  width: 100%; padding: 10px 14px;
  font-family: var(--mono); font-size: 14px;
  border: 1px solid var(--rule-strong);
  background: var(--paper);
  border-radius: var(--rad); outline: none;
  transition: border-color 0.2s;
}
.calc-input:focus { border-color: var(--blueprint); }
.calc-label {
  font-family: var(--body); font-size: 13px;
  font-weight: 500; color: var(--ink-2);
  display: block; margin-bottom: 6px;
}
.calc-result {
  background: var(--ink); color: var(--paper);
  padding: 24px; border-radius: var(--rad-lg);
  font-family: var(--mono);
}
.calc-result-label {
  font-size: 11px; color: var(--amber);
  text-transform: uppercase; letter-spacing: 0.12em;
  margin-bottom: 8px;
}
.calc-result-value {
  font-family: var(--display); font-size: 36px;
  font-weight: 600; letter-spacing: -0.02em;
}

/* ========== Sticky Scroll CTA ========== */
.mm-sticky-cta {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 320px;
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--rad-lg);
  padding: 18px 20px 16px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.25), 0 0 0 1px rgba(232,167,51,0.3);
  z-index: 1000;
  font-family: var(--body);
  transform: translateY(140%);
  opacity: 0;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s;
  border-left: 3px solid var(--amber);
}
.mm-sticky-cta.mm-sticky-show {
  transform: translateY(0);
  opacity: 1;
}
.mm-sticky-close {
  position: absolute;
  top: 6px;
  right: 8px;
  background: transparent;
  border: 0;
  color: rgba(245,242,236,0.5);
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  padding: 4px 8px;
  font-family: var(--body);
}
.mm-sticky-close:hover { color: var(--paper); }
.mm-sticky-eyebrow {
  font-family: var(--mono);
  font-size: 9px;
  color: var(--amber);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  margin-bottom: 8px;
  font-weight: 600;
}
.mm-sticky-title {
  font-family: var(--display);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}
.mm-sticky-sub {
  font-size: 12.5px;
  line-height: 1.45;
  color: rgba(245,242,236,0.75);
  margin-bottom: 12px;
}
.mm-sticky-cta-btn {
  display: inline-block;
  background: var(--amber);
  color: var(--ink);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: var(--rad);
  font-family: var(--body);
  font-size: 12px;
  font-weight: 600;
  text-transform: none;
  letter-spacing: 0.01em;
  transition: transform 0.15s, background 0.15s;
}
.mm-sticky-cta-btn:hover {
  background: #f0b347;
  transform: translateY(-1px);
}
@media (max-width: 600px) {
  .mm-sticky-cta {
    bottom: 12px;
    right: 12px;
    left: 12px;
    width: auto;
    max-width: none;
  }
}