/* ==========================================================================
   Suo Systems — site styles
   Light, editorial, engineering-accurate. Tokens first, then components.
   ========================================================================== */

:root {
  /* color */
  --ink: #0b1416;          /* headings, dark surfaces */
  --body: #3c4e52;         /* long-form text */
  --muted: #4c5c60;        /* secondary text */
  --soft: #5c6e72;         /* card copy */
  --faint: #5f7377;        /* meta, labels — 4.7:1 on #F7FAFA (WCAG AA) */
  --canvas: #ffffff;
  --surface: #f7fafa;      /* tinted sections and panels */
  --rule: #e9efef;         /* hairlines */
  --rule-strong: #e3eaea;  /* card strokes */
  --accent: #2ad1c3;       /* fills and graphics only */
  --accent-ink: #0b7c72;   /* text-level teal, AA on white */
  --accent-wash: #eaf8f7;  /* pill background */
  --accent-line: #c7ede9;
  --amber-wash: #fef1e3;
  --amber-ink: #9a5b12;
  --amber: #b9832f;

  /* layout */
  --max: 1200px;
  --gutter: clamp(1.25rem, 4vw, 2rem);
  --radius: 16px;
  --radius-lg: 20px;

  /* type */
  --display: "Instrument Sans", "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --shadow-card: 0 20px 48px -14px rgba(4, 12, 13, 0.1);
}

/* base ------------------------------------------------------------------- */

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--canvas);
  color: var(--body);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration-color: var(--accent); text-underline-offset: 0.18em; }
a:hover { color: var(--accent-ink); }
button { font: inherit; }
:focus-visible { outline: 2px solid var(--accent-ink); outline-offset: 2px; border-radius: 4px; }
.featured-card:focus-visible, .featured-card :focus-visible, .button:focus-visible { outline-color: var(--accent); }
h1, h2, h3, h4, p { margin-top: 0; }
h1, h2, h3 { font-family: var(--display); color: var(--ink); text-wrap: balance; }
h1, h2 { letter-spacing: -0.03em; line-height: 1.1; }
h3 { letter-spacing: -0.01em; line-height: 1.35; }
h1 { margin-bottom: 1.4rem; font-size: clamp(2.2rem, 4.6vw, 3.5rem); font-weight: 700; }
h2 { margin-bottom: 1.2rem; font-size: clamp(1.6rem, 2.6vw, 2.1rem); font-weight: 600; }
h3 { margin-bottom: 0.5rem; font-size: 1.2rem; font-weight: 600; }
::selection { background: var(--accent); color: #06201d; }

.shell { width: min(calc(100% - 2 * var(--gutter)), var(--max)); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; z-index: 20; top: 1rem; left: 1rem; padding: 0.65rem 0.9rem; border-radius: 10px; background: var(--ink); color: #fff; text-decoration: none; transform: translateY(-200%); }
.skip-link:focus { transform: none; }

/* header ----------------------------------------------------------------- */

.site-header { position: relative; z-index: 10; border-bottom: 1px solid var(--rule); background: rgba(255, 255, 255, 0.92); backdrop-filter: blur(8px); }
.header-inner { display: flex; min-height: 76px; align-items: center; justify-content: space-between; gap: 2rem; }
.brand { display: inline-flex; align-items: center; gap: 0.6rem; padding: 0.55rem 0; margin: -0.55rem 0; color: var(--ink); text-decoration: none; }
.brand-mark { display: block; flex: 0 0 auto; }
.brand-name { font-family: var(--display); font-size: 1.06rem; font-weight: 600; letter-spacing: -0.02em; white-space: nowrap; }
.site-nav { display: flex; align-items: center; gap: 1.9rem; }
.site-nav > a:not(.button) { color: var(--muted); font-size: 0.88rem; font-weight: 500; text-decoration: none; transition: color 0.15s ease; }
.site-nav > a:not(.button):hover { color: var(--ink); }
.site-nav > a[aria-current="page"] { color: var(--ink); font-weight: 600; }
.menu-toggle { display: none; border: 0; background: transparent; color: var(--ink); cursor: pointer; }

/* buttons ---------------------------------------------------------------- */

.button {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.6rem;
  min-height: 49px; padding: 0.85rem 1.5rem;
  border-radius: 12px; background: var(--ink); color: #fff;
  font-size: 0.94rem; font-weight: 600; letter-spacing: -0.01em; text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease;
}
.button:hover { background: #14232a; color: #fff; transform: translateY(-1px); box-shadow: var(--shadow-card); }
.button svg, .button span[aria-hidden] { color: var(--accent); }
.button-arrow span { font-size: 1.15rem; line-height: 0; }
.button-small { min-height: 38px; padding: 0.5rem 1rem; font-size: 0.84rem; border-radius: 10px; }
.button-ghost { display: inline-flex; align-items: center; gap: 0.5rem; padding: 1rem 0; color: var(--ink); font-size: 0.94rem; font-weight: 500; text-decoration: none; }
.button-ghost span[aria-hidden] { color: var(--accent-ink); }
.button-ghost:hover span[aria-hidden] { transform: translateX(2px); }
.text-link { display: inline-flex; align-items: center; gap: 0.4rem; color: var(--accent-ink); font-size: 0.84rem; font-weight: 600; text-decoration: none; white-space: nowrap; }
.text-link b { font-weight: 400; }
.text-link:hover { color: var(--ink); }

.eyebrow-chip {
  display: inline-flex; align-items: center; gap: 0.55rem; margin: 0;
  padding: 0.42rem 0.8rem; border: 1px solid var(--accent-line); border-radius: 100px;
  background: var(--accent-wash); color: var(--accent-ink);
  font-family: var(--mono); font-size: 0.69rem; font-weight: 500; letter-spacing: 0.06em; text-transform: uppercase;
}
.eyebrow-chip .dot { width: 6px; height: 6px; border-radius: 100%; background: #17b9a9; }

.section-eyebrow { margin: 0; color: var(--accent-ink); font-family: var(--mono); font-size: 0.72rem; font-weight: 500; letter-spacing: 0.09em; text-transform: uppercase; }
.section-index { margin: 0.4rem 0 0; color: var(--faint); font-family: var(--mono); font-size: 0.66rem; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; }

/* hero ------------------------------------------------------------------- */

.hero { overflow: hidden; border-bottom: 1px solid var(--rule); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.85fr); gap: clamp(2.5rem, 5vw, 4.5rem); align-items: center; padding-block: clamp(4rem, 8vw, 6.5rem); }
.hero-copy { display: flex; flex-direction: column; align-items: flex-start; gap: 1.5rem; position: relative; z-index: 2; }
.hero-copy h1 { margin-bottom: 0; max-width: 15ch; font-size: clamp(2.4rem, 4.8vw, 3.6rem); line-height: 1.07; letter-spacing: -0.035em; }
.hero-lede { max-width: 620px; margin: 0; color: var(--muted); font-size: clamp(1.05rem, 1.5vw, 1.16rem); line-height: 1.62; }
.hero-fit { max-width: 620px; margin: -0.35rem 0 0; padding: 0.85rem 1rem; border-left: 2px solid var(--accent); border-radius: 0 10px 10px 0; background: var(--accent-wash); color: var(--body); font-size: 0.92rem; line-height: 1.55; }
.hero-fit strong { color: var(--ink); }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem 1.5rem; }
.trust-line { margin: 0.4rem 0 0; color: var(--faint); font-family: var(--mono); font-size: 0.78rem; }

/* system map ------------------------------------------------------------- */

.system-map { display: flex; flex-direction: column; gap: 1.1rem; padding: 1.5rem; border: 1px solid var(--rule-strong); border-radius: var(--radius-lg); background: var(--canvas); box-shadow: var(--shadow-card); }
.map-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.map-label { color: var(--faint); font-family: var(--mono); font-size: 0.68rem; font-weight: 500; letter-spacing: 0.11em; text-transform: uppercase; }
.map-chip { display: inline-flex; align-items: center; gap: 0.38rem; padding: 0.28rem 0.55rem; border-radius: 100px; background: var(--surface); color: var(--soft); font-family: var(--mono); font-size: 0.6rem; letter-spacing: 0.07em; text-transform: uppercase; }
.map-chip i { width: 5px; height: 5px; border-radius: 100%; background: var(--accent); }
.node-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.65rem; }
.node { display: flex; flex-direction: column; justify-content: center; gap: 0.2rem; min-height: 68px; padding: 0.8rem 0.85rem; border: 1px solid var(--rule-strong); border-radius: 12px; background: var(--canvas); }
.node span { color: var(--ink); font-size: 0.86rem; font-weight: 600; }
.node small { color: var(--faint); font-family: var(--mono); font-size: 0.63rem; line-height: 1.5; }
.map-core { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1.1rem 1.25rem; border-radius: 14px; background: var(--ink); }
.map-core-title { display: block; color: #fff; font-family: var(--display); font-size: 1.18rem; font-weight: 600; letter-spacing: -0.02em; }
.map-core small { display: block; margin-top: 0.15rem; color: #9bb0b2; font-size: 0.8rem; }
.map-core b { display: grid; place-content: center; flex: 0 0 auto; width: 40px; height: 40px; border-radius: 100%; background: var(--accent); color: #06201d; font-size: 1.1rem; font-weight: 400; }

/* sections --------------------------------------------------------------- */

.section { padding-block: clamp(4rem, 8vw, 6.5rem); }
.section-rule { border-top: 1px solid var(--rule); }
.section-tint { background: var(--surface); }
.split-heading, .content-grid, .intro-grid { display: grid; grid-template-columns: minmax(150px, 0.2fr) minmax(0, 0.8fr); gap: clamp(2rem, 5vw, 4rem); align-items: start; }
.section-head { display: flex; flex-direction: column; gap: 0.9rem; margin-bottom: 2.6rem; }
.section-head h2 { margin-bottom: 0; max-width: 21ch; font-size: clamp(1.9rem, 3.2vw, 2.55rem); }
.section-lede { max-width: 620px; margin: 0; color: var(--muted); font-size: 1.05rem; }
.body-large { max-width: 740px; color: var(--muted); font-size: clamp(1.04rem, 1.5vw, 1.16rem); line-height: 1.72; }

/* cards ------------------------------------------------------------------ */

.card-top { display: flex; align-items: center; justify-content: space-between; gap: 0.75rem; }
.card-index { color: var(--faint); font-family: var(--mono); font-size: 0.72rem; }
.card-arrow { display: grid; place-content: center; flex: 0 0 auto; width: 30px; height: 30px; border: 1px solid var(--rule-strong); border-radius: 100%; color: var(--accent-ink); font-size: 0.95rem; font-weight: 400; transition: transform 0.18s ease; }
.status-chip { display: inline-flex; align-items: center; padding: 0.3rem 0.55rem; border-radius: 100px; background: var(--surface); color: var(--soft); font-family: var(--mono); font-size: 0.58rem; font-weight: 500; letter-spacing: 0.07em; text-transform: uppercase; white-space: nowrap; }
.status-chip.is-amber { background: var(--amber-wash); color: var(--amber-ink); }
.status-chip.is-teal { background: var(--accent-wash); color: var(--accent-ink); }

.problem-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.25rem; }
.problem-card { display: flex; flex-direction: column; gap: 0.75rem; min-height: 200px; padding: 1.4rem 1.5rem; border: 1px solid var(--rule-strong); border-radius: var(--radius); background: var(--canvas); }
.problem-card h3 { margin-bottom: 0; font-size: 1.18rem; line-height: 1.35; }
.problem-card p { margin: 0; color: var(--soft); font-size: 0.9rem; line-height: 1.55; }

.service-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.25rem; }
.service-card { display: flex; flex-direction: column; gap: 0.75rem; padding: 1.5rem; border: 1px solid var(--rule-strong); border-radius: var(--radius); background: var(--canvas); text-decoration: none; transition: transform 0.18s ease, box-shadow 0.18s ease; }
.service-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-card); }
.service-card:hover .card-arrow { border-color: var(--accent-line); transform: translateX(2px); }
.service-card h2, .service-card h3 { margin-bottom: 0; font-size: 1.2rem; line-height: 1.3; }
.service-card p { flex: 1 1 auto; margin: 0; color: var(--soft); font-size: 0.9rem; line-height: 1.55; }
.service-card .service-index { color: var(--faint); font-family: var(--mono); font-size: 0.72rem; }
.service-outcome { display: inline-flex; align-items: center; gap: 0.45rem; color: var(--accent-ink); font-family: var(--mono); font-size: 0.69rem; }
.service-outcome::before { content: ""; width: 5px; height: 5px; border-radius: 100%; background: var(--accent); }
.service-card.is-featured { border-color: var(--ink); background: var(--ink); }
.service-card.is-featured h3 { color: #fff; }
.service-card.is-featured p { color: #a8b8ba; }
.service-card.is-featured .service-index { color: #6e8082; }
.service-card.is-featured .card-arrow { border-color: #3a4a4c; }
.service-card.is-featured .service-outcome { color: #7fd8cf; }

/* page intro ------------------------------------------------------------- */

.page-intro { padding-block: clamp(4rem, 8vw, 5.5rem) clamp(2.5rem, 5vw, 3.5rem); border-bottom: 1px solid var(--rule); }
.intro-grid h1, .page-intro-grid h1 { margin-bottom: 1.1rem; max-width: 22ch; }
.page-intro-grid { display: flex; flex-direction: column; align-items: flex-start; gap: 1.3rem; }
.service-intro .button, .contact-intro .button { margin-top: 0.25rem; }
.back-link { display: inline-flex; align-items: center; gap: 0.45rem; padding: 0.6rem 0.9rem 0.6rem 0; margin: -0.6rem -0.9rem -0.6rem 0; color: var(--soft); font-size: 0.82rem; font-weight: 500; text-decoration: none; }
.back-link:hover { color: var(--ink); }
.back-link::before { content: "←"; color: var(--soft); }

/* service detail --------------------------------------------------------- */

.detail-intro { display: grid; grid-template-columns: minmax(0, 1fr) 380px; gap: clamp(2.5rem, 5vw, 4rem); align-items: start; }
.detail-intro-copy { display: flex; flex-direction: column; align-items: flex-start; gap: 1.25rem; }
.detail-intro-copy h1 { margin-bottom: 0; max-width: 18ch; font-size: clamp(2.1rem, 3.8vw, 2.75rem); }
.detail-intro-copy .hero-lede { max-width: 560px; }
.toc-card { position: sticky; top: 1.5rem; display: flex; flex-direction: column; gap: 0.85rem; padding: 1.4rem; border: 1px solid var(--rule-strong); border-radius: var(--radius); background: var(--surface); }
.toc-label { margin: 0 0 0.15rem; color: var(--faint); font-family: var(--mono); font-size: 0.66rem; font-weight: 500; letter-spacing: 0.11em; text-transform: uppercase; }
.toc-card a { display: flex; align-items: baseline; gap: 0.75rem; padding: 0.45rem 0.5rem 0.45rem 0; margin: -0.45rem -0.5rem -0.45rem 0; color: var(--soft); font-size: 0.85rem; font-weight: 500; text-decoration: none; line-height: 1.5; }
.toc-card a span { flex: 0 0 22px; color: var(--faint); font-family: var(--mono); font-size: 0.69rem; }
.toc-card a:hover, .toc-card a.is-current { color: var(--ink); font-weight: 600; }
.toc-card a:hover span, .toc-card a.is-current span { color: var(--accent-ink); }

.detail-grid { display: grid; grid-template-columns: minmax(150px, 0.2fr) minmax(0, 0.8fr); gap: clamp(2rem, 5vw, 4.5rem); align-items: start; }
.detail-rail { display: flex; flex-direction: column; gap: 0.5rem; }
.rail-index { color: var(--accent-ink); font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.08em; }
.rail-label { color: var(--faint); font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.11em; text-transform: uppercase; }
.detail-body { display: flex; flex-direction: column; gap: 1.4rem; max-width: 720px; }
.detail-body h2 { margin-bottom: 0; font-size: clamp(1.5rem, 2.4vw, 1.8rem); }
.detail-body > p { margin: 0; }

.symptom-list { display: flex; flex-direction: column; margin: 0; padding: 0; list-style: none; }
.symptom-list li { padding: 1rem 0; border-bottom: 1px solid var(--rule); color: var(--body); font-size: 1rem; line-height: 1.6; }
.symptom-list li:first-child { padding-top: 0; }
.symptom-list li:last-child { border-bottom: 0; }

.method-card { display: flex; flex-direction: column; margin: 0; padding: 0.5rem 2rem; border-radius: var(--radius-lg); background: var(--ink); list-style: none; }
.method-card li { display: flex; gap: 1.25rem; align-items: baseline; padding: 1.2rem 0; border-bottom: 1px solid #1c2b2d; }
.method-card li:last-child { border-bottom: 0; }
.method-card span { flex: 0 0 34px; color: var(--accent); font-family: var(--mono); font-size: 0.75rem; letter-spacing: 0.06em; }
.method-card p { margin: 0; color: #c3d2d3; font-size: 1rem; line-height: 1.62; }

.prepare-list, .handover-list { display: flex; flex-direction: column; gap: 0.95rem; margin: 0; padding: 0; list-style: none; }
.prepare-list li, .handover-list li { position: relative; padding-left: 1.9rem; color: var(--body); font-size: 0.97rem; line-height: 1.6; }
.prepare-list li::before, .handover-list li::before {
  content: ""; position: absolute; left: 0; top: 0.28rem; width: 18px; height: 18px; border-radius: 100%;
  background: var(--accent-wash) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 18 18'%3E%3Cpath d='M5.4 9.2 7.9 11.7 12.6 6.7' fill='none' stroke='%230b7c72' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 18px 18px no-repeat;
}
.handover-panel { margin: 0; padding: 1.5rem 1.6rem; border: 1px solid var(--rule-strong); border-radius: var(--radius); background: var(--surface); }
.boundary-panel { display: flex; flex-direction: column; gap: 1rem; margin: 0; padding: 1.5rem 1.6rem; border: 1px solid #f1e4d4; border-radius: var(--radius); background: #fdf8f2; list-style: none; }
.boundary-panel li { position: relative; padding-left: 1.9rem; color: #5a5045; font-size: 0.97rem; line-height: 1.6; }
.boundary-panel li::before {
  content: ""; position: absolute; left: 0; top: 0.28rem; width: 18px; height: 18px; border-radius: 100%;
  background: #fbebd8 url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 18 18'%3E%3Cpath d='M5.6 9h6.8' fill='none' stroke='%23b9832f' stroke-width='1.7' stroke-linecap='round'/%3E%3C/svg%3E") center / 18px 18px no-repeat;
}

/* legacy content blocks (about / how it works / contact / privacy) ------- */

.check-list, .detail-list { margin: 1.6rem 0 0; padding: 0; list-style: none; }
.check-list { display: grid; gap: 0.9rem; max-width: 680px; }
.check-list li { position: relative; padding-left: 2rem; color: var(--muted); }
.check-list li::before { position: absolute; left: 0; top: 0.32rem; width: 18px; height: 18px; border-radius: 100%; background: var(--accent-wash) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 18 18'%3E%3Cpath d='M5.4 9.2 7.9 11.7 12.6 6.7' fill='none' stroke='%230b7c72' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 18px 18px no-repeat; content: ""; }
.detail-list li { position: relative; padding: 0.95rem 0 0.95rem 1.4rem; border-bottom: 1px solid var(--rule); color: var(--muted); }
.detail-list li::before { position: absolute; top: 1.6rem; left: 0; width: 4px; height: 4px; border-radius: 100%; background: var(--accent); content: ""; }
.method-list { margin: 0; padding: 0; list-style: none; counter-reset: method; }
.method-list li { position: relative; padding: 1rem 0 1rem 3rem; border-bottom: 1px solid var(--rule); color: var(--muted); counter-increment: method; }
.method-list li::before { position: absolute; top: 1.1rem; left: 0; color: var(--accent-ink); font-family: var(--mono); font-size: 0.72rem; content: "0" counter(method); }

.service-list { border-top: 1px solid var(--rule); }
.service-list-item { display: grid; grid-template-columns: 58px minmax(0, 1fr) 145px; gap: 2rem; align-items: start; padding-block: 2.2rem; border-bottom: 1px solid var(--rule); }
.service-list-item > span { color: var(--accent-ink); font-family: var(--mono); font-size: 0.72rem; }
.service-list-item h2 { margin-bottom: 0.8rem; font-size: clamp(1.5rem, 2.6vw, 2rem); }
.service-list-item h2 a { text-decoration: none; }
.service-list-item p { max-width: 680px; margin: 0; color: var(--muted); }

.process-grid { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 2.6rem; border-top: 1px solid var(--rule); }
.process-grid article { min-height: 200px; padding: 1.6rem 1.8rem 1.4rem 0; border-bottom: 1px solid var(--rule); }
.process-grid article + article { padding-left: 1.8rem; border-left: 1px solid var(--rule); }
.process-grid article > span { color: var(--accent-ink); font-family: var(--mono); font-size: 0.72rem; }
.process-grid h3 { margin-top: 1.2rem; }
.process-grid p { color: var(--muted); font-size: 0.9rem; }
.process-detail { border-top: 1px solid var(--rule); }
.process-detail article { display: grid; grid-template-columns: minmax(110px, 0.16fr) 1fr; gap: 2rem; padding-block: 2.4rem; border-bottom: 1px solid var(--rule); }
.process-detail article > span { color: var(--accent-ink); font-family: var(--mono); font-size: 0.72rem; }
.process-detail h2 { margin-bottom: 0.7rem; font-size: clamp(1.5rem, 2.6vw, 1.95rem); }
.process-detail p, .prose-block p { max-width: 740px; margin-bottom: 1rem; color: var(--muted); font-size: 1.02rem; line-height: 1.7; }
.prose-block .body-large { color: var(--ink); }
.muted-block { background: var(--surface); }

/* email panel ------------------------------------------------------------ */

.email-panel { display: flex; flex-direction: column; align-items: flex-start; gap: 1.4rem; margin-block: clamp(3.5rem, 7vw, 5.5rem); padding: clamp(2rem, 5vw, 4rem) clamp(1.5rem, 4vw, 3rem); border-radius: var(--radius-lg); background: linear-gradient(180deg, #e6f7f5 0%, #f8fbfb 100%); }
.email-panel h2 { max-width: 24ch; margin: 0; font-size: clamp(1.8rem, 3.4vw, 2.6rem); }
.email-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1.25rem; }
.email-address { padding: 0.6rem 0; margin: -0.6rem 0; color: var(--muted); font-family: var(--mono); font-size: 0.84rem; text-decoration: none; transition: color 0.15s ease; }
.email-address:hover { color: var(--accent-ink); }

/* insights --------------------------------------------------------------- */

.list-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1.5rem; margin-bottom: 1.8rem; }
.list-head h2 { margin-bottom: 0; }
.list-count { color: var(--faint); font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.11em; text-transform: uppercase; }

.featured-card { display: flex; flex-direction: column; gap: 0.9rem; margin-bottom: 1.25rem; padding: 1.9rem 2rem; border-radius: var(--radius-lg); background: var(--ink); color: inherit; text-decoration: none; transition: transform 0.18s ease, box-shadow 0.18s ease; }
.featured-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-card); color: inherit; }
.featured-card .card-top { align-items: center; }
.featured-card .article-meta { color: #6e8082; }
.featured-card h2 { max-width: 30ch; margin-bottom: 0; color: #fff; font-size: clamp(1.6rem, 2.8vw, 2.1rem); }
.featured-card > p { max-width: 62ch; margin: 0; color: #a8b8ba; font-size: 1rem; line-height: 1.6; }
.featured-card .card-tags { color: #7fd8cf; }
.featured-card .text-link { color: var(--accent); }

.article-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.25rem; }
.article-card { position: relative; display: flex; flex-direction: column; gap: 0.85rem; min-height: 260px; padding: 1.5rem 1.6rem; border: 1px solid var(--rule-strong); border-radius: var(--radius); background: var(--canvas); transition: transform 0.18s ease, box-shadow 0.18s ease; }
.article-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-card); }
.article-card:hover .card-arrow { border-color: var(--accent-line); transform: translateX(2px); }
.article-card h2 { margin-bottom: 0; font-size: 1.25rem; line-height: 1.35; }
.article-card h2 a { text-decoration: none; }
.article-card h2 a::after { position: absolute; inset: 0; content: ""; border-radius: var(--radius); }
.article-card > p { flex: 1 1 auto; margin: 0; color: var(--soft); font-size: 0.9rem; line-height: 1.55; }
.card-tags { color: var(--faint); font-family: var(--mono); font-size: 0.66rem; line-height: 1.6; }

.article-meta { margin: 0; color: var(--faint); font-family: var(--mono); font-size: 0.69rem; letter-spacing: 0.02em; }
.tag-list { display: flex; flex-wrap: wrap; gap: 0.45rem; margin: 1.2rem 0 0; padding: 0; list-style: none; }
.tag-list span { padding: 0.28rem 0.5rem; border: 1px solid var(--rule-strong); border-radius: 6px; color: var(--soft); font-family: var(--mono); font-size: 0.62rem; }

.article-header { display: flex; flex-direction: column; align-items: flex-start; gap: 1.2rem; padding-block: clamp(3.5rem, 7vw, 5rem) 2.5rem; }
.article-header h1 { margin-bottom: 0; max-width: 24ch; font-size: clamp(2rem, 3.8vw, 2.75rem); }
.article-header .hero-lede { max-width: 620px; }
.article-header .article-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 0.7rem; color: var(--muted); font-family: var(--sans); font-size: 0.85rem; font-weight: 500; }
.article-header .article-meta time, .article-header .article-meta .meta-mono { font-family: var(--mono); font-size: 0.7rem; color: var(--faint); }
.article-header .article-meta .meta-sep { width: 1px; height: 14px; background: var(--rule-strong); }

.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: clamp(2.5rem, 5vw, 4.5rem); align-items: start; padding-block: 1.5rem 1rem; }
.article-aside { position: sticky; top: 1.5rem; display: flex; flex-direction: column; gap: 1.25rem; }
.aside-card { display: flex; flex-direction: column; gap: 0.6rem; padding: 1.4rem; border: 1px solid var(--rule-strong); border-radius: var(--radius); background: var(--surface); }
.aside-card.is-plain { background: var(--canvas); }
.aside-label { margin: 0; color: var(--faint); font-family: var(--mono); font-size: 0.66rem; font-weight: 500; letter-spacing: 0.11em; text-transform: uppercase; }
.aside-tags { margin: 0; color: var(--muted); font-size: 0.85rem; line-height: 1.6; }
.aside-card p:not(.aside-label) { margin: 0; color: var(--muted); font-size: 0.88rem; line-height: 1.55; }
.aside-card .button { min-height: 42px; padding: 0.55rem 1rem; font-size: 0.84rem; }

.article-content { max-width: 740px; font-size: 1.06rem; line-height: 1.72; }
.article-content > * + * { margin-top: 1.35rem; }
.article-content > hr { margin-block: 2.4rem; border: 0; border-top: 1px solid var(--rule); }
.article-content h2 { margin: 3rem 0 0; padding-top: 0.25rem; font-size: clamp(1.5rem, 2.6vw, 1.9rem); }
.article-content h3 { margin: 2.2rem 0 0; font-size: 1.25rem; }
.article-content p, .article-content li { color: var(--body); }
.article-content a { color: var(--accent-ink); }
.article-content ul, .article-content ol { padding-left: 1.4rem; }
.article-content li { margin-bottom: 0.5rem; }
.article-content li::marker { color: var(--faint); }
.article-content code { padding: 0.12em 0.4em; border-radius: 6px; background: var(--surface); color: var(--ink); font-family: var(--mono); font-size: 0.85em; }
.article-content pre { padding: 1.1rem 1.25rem; border: 1px solid var(--rule-strong); border-radius: 12px; background: var(--surface); overflow-x: auto; }
.article-content pre code { padding: 0; background: none; }
.article-content blockquote { margin: 0; padding-left: 1.2rem; border-left: 2px solid var(--accent); color: var(--muted); }
.article-content input[type="checkbox"] { width: 15px; height: 15px; margin-right: 0.5rem; accent-color: var(--accent-ink); }
.article-content li:has(> input[type="checkbox"]) { display: flex; align-items: baseline; gap: 0.35rem; margin-bottom: 0.65rem; list-style: none; }

.related-panel { display: flex; align-items: center; justify-content: space-between; gap: 1.25rem; margin-top: 2.5rem; padding: 1.25rem 1.4rem; border: 1px solid var(--rule-strong); border-radius: var(--radius); background: var(--surface); }
.related-panel p { margin: 0; }
.related-panel .related-label { color: var(--faint); font-family: var(--mono); font-size: 0.63rem; letter-spacing: 0.11em; text-transform: uppercase; }
.related-panel .related-title { display: block; margin-top: 0.25rem; color: var(--ink); font-size: 1rem; font-weight: 600; }
.related-panel a { display: grid; place-content: center; flex: 0 0 auto; width: 40px; height: 40px; border-radius: 100%; background: var(--ink); color: var(--accent); text-decoration: none; }
.related-panel a:hover { background: #14232a; color: var(--accent); }

/* footer ----------------------------------------------------------------- */

.site-footer { border-top: 1px solid var(--rule); background: var(--surface); }
.footer-closing { background: linear-gradient(180deg, #e6f7f5 0%, rgba(247, 250, 250, 0) 100%); }
.footer-closing-inner { display: flex; flex-direction: column; align-items: flex-start; gap: 1.4rem; padding-block: clamp(3.5rem, 7vw, 5rem) 3rem; }
.footer-closing h2 { max-width: 26ch; margin: 0; font-size: clamp(1.9rem, 3.4vw, 2.6rem); }
.footer-columns { display: grid; grid-template-columns: minmax(240px, 1.4fr) repeat(3, minmax(0, 1fr)); gap: 2.5rem; padding-block: 3rem; }
.footer-brand { display: inline-flex; align-items: center; gap: 0.6rem; padding: 0.55rem 0; margin: -0.55rem 0; color: var(--ink); text-decoration: none; }
.footer-tagline { max-width: 300px; margin: 1rem 0 0; color: var(--soft); font-size: 0.86rem; line-height: 1.6; }
.footer-col { display: flex; flex-direction: column; gap: 0.85rem; }
.footer-col-label { margin: 0 0 0.2rem; color: var(--faint); font-family: var(--mono); font-size: 0.64rem; font-weight: 500; letter-spacing: 0.11em; text-transform: uppercase; }
.footer-col a { padding: 0.5rem 0; margin: -0.5rem 0; color: var(--muted); font-size: 0.88rem; font-weight: 500; text-decoration: none; line-height: 1.5; }
.footer-col a:hover { color: var(--ink); }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-block: 1.3rem; border-top: 1px solid var(--rule-strong); color: var(--faint); font-family: var(--mono); font-size: 0.68rem; }
.footer-bottom p { margin: 0; }
.footer-bottom a { padding: 0.5rem 0; margin: -0.5rem 0; color: var(--soft); text-decoration: none; }
.footer-bottom a:hover { color: var(--ink); }

/* misc ------------------------------------------------------------------- */

.policy { max-width: 780px; margin-inline: auto; padding-block: 1rem 4rem; }
.policy h2 { margin-top: 2.8rem; font-size: clamp(1.4rem, 2.4vw, 1.8rem); }
.not-found { min-height: 58vh; display: grid; align-items: center; }

/* responsive ------------------------------------------------------------- */

@media (max-width: 980px) {
  .header-inner { min-height: 64px; }
  .menu-toggle { display: grid; place-content: center; width: 44px; height: 44px; gap: 5px; }
  .menu-toggle span:not(.sr-only) { display: block; width: 19px; height: 1.5px; border-radius: 2px; background: currentColor; transition: transform 0.18s ease; }
  .menu-toggle[aria-expanded="true"] span:nth-child(2) { transform: translateY(3.25px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-3.25px) rotate(-45deg); }
  .site-nav { position: absolute; top: 64px; right: var(--gutter); left: var(--gutter); display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 0.75rem; border: 1px solid var(--rule-strong); border-radius: 14px; background: var(--canvas); box-shadow: var(--shadow-card); }
  .site-nav.is-open { display: flex; }
  .site-nav > a:not(.button) { padding: 0.75rem; border-radius: 10px; font-size: 0.95rem; }
  .site-nav > a:not(.button):hover { background: var(--surface); }
  .site-nav .button { margin: 0.45rem 0 0; }
  .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .node-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .split-heading, .content-grid, .intro-grid, .detail-grid { grid-template-columns: 1fr; gap: 1.2rem; }
  .detail-rail { flex-direction: row; align-items: baseline; gap: 0.75rem; }
  .problem-grid, .service-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .problem-card, .service-card { min-height: 0; }
  .toc-card { position: static; }
  .detail-intro { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: 1fr; }
  .process-grid article, .process-grid article + article { min-height: auto; padding: 1.5rem 0; border-left: 0; }
  .service-list-item { grid-template-columns: 36px 1fr; gap: 1rem; }
  .service-list-item .text-link { grid-column: 2; }
  .process-detail article { grid-template-columns: 45px 1fr; gap: 1.1rem; }
  .article-grid { grid-template-columns: 1fr; }
  .article-card { min-height: 0; }
  .article-layout { grid-template-columns: 1fr; gap: 1.5rem; }
  .article-aside { position: static; }
  .email-panel { margin-block: 3rem; }
  .footer-columns { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  h1 { font-size: clamp(1.9rem, 8.5vw, 2.4rem); }
  .hero-grid { padding-block: 3rem 3.5rem; }
  .hero-actions .button { width: 100%; }
  .hero-actions .button-ghost { width: 100%; justify-content: center; padding: 0.85rem 0; border: 1px solid var(--rule-strong); border-radius: 12px; }
  .node-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.55rem; }
  .node { min-height: 58px; padding: 0.65rem 0.7rem; }
  .node span { font-size: 0.8rem; }
  .node small { font-size: 0.58rem; }
  .problem-grid, .service-grid { grid-template-columns: 1fr; }
  .method-card { padding-inline: 1.25rem; }
  .method-card li { gap: 0.85rem; }
  .method-card span { flex-basis: 26px; }
  .email-panel { padding: 1.6rem 1.4rem; }
  .email-panel .button { width: 100%; }
  .email-actions { flex-direction: column; align-items: stretch; }
  .email-actions .email-address { text-align: center; }
  .footer-closing .button { width: 100%; }
  .footer-columns { grid-template-columns: 1fr; gap: 2rem; }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 0.4rem; }
  .related-panel { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}