/* ============================================================
   em-os.gr — Design System
   Palette: #020202 (ink) · #F4F4F5 (paper) · #FF4500 (accent)
   ============================================================ */

:root {
  --ink: #020202;
  --ink-1: #08080a;
  --ink-2: #0e0e11;
  --ink-3: #16161a;
  --line: rgba(244, 244, 245, 0.10);
  --line-strong: rgba(244, 244, 245, 0.20);
  --paper: #f4f4f5;
  --paper-dim: rgba(244, 244, 245, 0.64);
  --paper-faint: rgba(244, 244, 245, 0.42);
  --accent: #ff4500;
  --accent-ink: #020202;
  --accent-dim: rgba(255, 69, 0, 0.14);
  --accent-line: rgba(255, 69, 0, 0.42);

  --maxw: 1180px;
  --gutter: clamp(20px, 5vw, 64px);
  --radius: 4px;
  --radius-lg: 10px;

  --font: "Inter", "Inter var", ui-sans-serif, system-ui, -apple-system,
    "Segoe UI", Roboto, "Noto Sans", "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", ui-monospace, "Cascadia Mono",
    Menlo, Consolas, monospace;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.62;
  font-feature-settings: "ss01" on, "cv01" on;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* Subtle engineered grid backdrop */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(244, 244, 245, 0.028) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(244, 244, 245, 0.028) 1px, transparent 1px);
  background-size: 68px 68px;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 0%, transparent 78%);
}

img, svg { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

::selection { background: var(--accent); color: var(--accent-ink); }

/* ---------- Layout ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
  position: relative;
  z-index: 1;
}
.wrap--narrow { max-width: 860px; }

.section { padding: clamp(56px, 9vw, 132px) 0; position: relative; z-index: 1; }
.section--tight { padding: clamp(40px, 6vw, 76px) 0; }
.section--line { border-top: 1px solid var(--line); }

/* ---------- Type ---------- */
h1, h2, h3, h4 { font-family: var(--font); font-weight: 900; line-height: 1.06; letter-spacing: -0.022em; margin: 0; }
h1 { font-size: clamp(2.4rem, 6.4vw, 4.6rem); }
h2 { font-size: clamp(1.75rem, 3.9vw, 2.85rem); letter-spacing: -0.026em; }
h3 { font-size: clamp(1.15rem, 2vw, 1.42rem); letter-spacing: -0.015em; }

p { margin: 0 0 1.05em; }
p:last-child { margin-bottom: 0; }
.lead { font-size: clamp(1.05rem, 1.7vw, 1.32rem); color: var(--paper-dim); line-height: 1.55; }

.eyebrow {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1.1em;
  display: flex;
  align-items: center;
  gap: 0.7em;
}
.eyebrow::before {
  content: "";
  width: 22px; height: 2px;
  background: var(--accent);
  flex: none;
}
.eyebrow--plain::before { display: none; }

.mono { font-family: var(--mono); font-variant-ligatures: none; }
.muted { color: var(--paper-dim); }
.faint { color: var(--paper-faint); }
.accent { color: var(--accent); }
.tnum { font-variant-numeric: tabular-nums; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(2, 2, 2, 0.82);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--line);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 74px;
}
.brand { display: flex; align-items: center; gap: 14px; flex: none; }
.brand__mark { height: 26px; width: auto; }
.brand__tag {
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--paper-faint);
  border-left: 1px solid var(--line-strong);
  padding-left: 14px;
  line-height: 1.3;
  max-width: 200px;
}
.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  font-size: 0.83rem;
  font-weight: 500;
  padding: 9px 14px;
  border-radius: var(--radius);
  color: var(--paper-dim);
  transition: color .18s ease, background .18s ease;
  white-space: nowrap;
}
.nav a:hover { color: var(--paper); background: rgba(244,244,245,0.05); }
.nav a[aria-current="page"] { color: var(--paper); }
.nav a[aria-current="page"]::after {
  content: ""; display: block; height: 2px; margin-top: 6px;
  background: var(--accent); border-radius: 2px;
}
.nav__cta {
  margin-left: 10px;
  background: var(--accent) !important;
  color: var(--accent-ink) !important;
  font-weight: 600 !important;
}
.nav__cta:hover { filter: brightness(1.08); }

.nav-toggle {
  display: none;
  background: none; border: 1px solid var(--line-strong); border-radius: var(--radius);
  color: var(--paper); width: 42px; height: 38px; cursor: pointer;
  align-items: center; justify-content: center; font-size: 18px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 0.88rem; font-weight: 600;
  padding: 13px 24px; border-radius: var(--radius);
  border: 1px solid transparent; cursor: pointer;
  transition: transform .15s ease, filter .18s ease, background .18s ease, border-color .18s ease;
  font-family: inherit;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary { background: var(--accent); color: var(--accent-ink); }
.btn--primary:hover { filter: brightness(1.08); }
.btn--ghost { border-color: var(--line-strong); color: var(--paper); }
.btn--ghost:hover { border-color: var(--paper); }
.btn__arrow { transition: transform .18s ease; }
.btn:hover .btn__arrow { transform: translateX(3px); }

/* ---------- Hero ---------- */
.hero { padding: clamp(72px, 12vw, 168px) 0 clamp(48px, 7vw, 96px); position: relative; z-index: 1; }
.hero__grid {
  display: grid; grid-template-columns: 1.35fr 0.65fr; gap: clamp(32px, 6vw, 80px);
  align-items: end;
}
.hero h1 { margin-bottom: 0.28em; }
.hero__word {
  color: var(--accent);
  display: inline-block;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.hero__aside { border-left: 1px solid var(--line-strong); padding-left: 26px; }
.hero__stat { padding: 16px 0; border-bottom: 1px solid var(--line); }
.hero__stat:last-child { border-bottom: 0; }
.hero__stat b { display: block; font-size: 1.9rem; letter-spacing: -0.03em; line-height: 1; }
.hero__stat span { font-size: 0.78rem; color: var(--paper-faint); letter-spacing: 0.04em; }

/* Non-CRM declaration band */
.declaration {
  border-block: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255,69,0,0.04), transparent);
}
.declaration__inner { padding-block: clamp(30px, 5vw, 56px); }
.declaration__line {
  font-family: var(--font);
  font-size: clamp(1.15rem, 3vw, 2rem);
  font-weight: 900; letter-spacing: -0.02em; line-height: 1.2;
  text-transform: uppercase;
}
.declaration__line s, .declaration__line .strike {
  color: var(--paper-faint);
  text-decoration-color: var(--accent);
  text-decoration-thickness: 3px;
}
.declaration__line .em { color: var(--accent); }

/* ---------- Law cards ---------- */
.laws { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden; }
.laws--2 { grid-template-columns: repeat(2, 1fr); }
.laws--3 { grid-template-columns: repeat(3, 1fr); }
.law--wide { grid-column: 1 / -1; }
.law {
  background: var(--ink);
  padding: clamp(24px, 3vw, 40px);
  position: relative;
  transition: background .2s ease;
}
.law:hover { background: var(--ink-2); }
.law__no {
  font-family: var(--mono);
  font-size: 0.72rem; letter-spacing: 0.14em;
  color: var(--accent); display: block; margin-bottom: 20px;
}
.law h3 { margin-bottom: 10px; }
.law p { color: var(--paper-dim); font-size: 0.95rem; margin: 0; }
.law__out {
  display: inline-block; margin-top: 18px;
  font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent); border: 1px solid var(--accent-line);
  padding: 5px 10px; border-radius: 999px;
}

/* ---------- Split / generic grids ---------- */
.split { display: grid; grid-template-columns: repeat(2, 1fr); gap: clamp(28px, 5vw, 72px); align-items: start; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; }

/* ---------- Cards ---------- */
.card {
  background: var(--ink-1);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(22px, 2.6vw, 34px);
  transition: border-color .2s ease, background .2s ease;
}
.card:hover { border-color: var(--line-strong); background: var(--ink-2); }
.card__top { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-bottom: 20px; }
.card h3 { margin-bottom: 12px; }
.card p { color: var(--paper-dim); font-size: 0.95rem; }

/* Tag / chip */
.tag {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 0.68rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase;
  padding: 5px 11px; border-radius: 999px;
  border: 1px solid var(--line-strong); color: var(--paper-dim);
}
.tag--accent { border-color: var(--accent-line); color: var(--accent); }
.tag--solid { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.tag--ok { border-color: rgba(74,222,128,0.5); color: #74e29a; }
.tag--warn { border-color: rgba(250,204,21,0.45); color: #f2d25b; }
.dot { width: 7px; height: 7px; border-radius: 50%; background: currentColor; }

/* ---------- Verification filter (registry) ---------- */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 26px; }
.filter-btn {
  font-family: inherit; font-size: 0.74rem; font-weight: 600;
  letter-spacing: 0.08em; text-transform: uppercase;
  padding: 8px 14px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--line-strong); color: var(--paper-dim);
  background: transparent;
  transition: color .15s ease, border-color .15s ease, background .15s ease;
}
.filter-btn:hover { color: var(--paper); border-color: var(--paper); }
.filter-btn.is-active { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }

/* ---------- Principle list ---------- */
.plist { list-style: none; margin: 0; padding: 0; }
.plist li { display: flex; gap: 18px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.plist li:last-child { border-bottom: 0; }
.plist__no { font-family: var(--mono); font-size: 0.8rem; color: var(--accent); flex: none; padding-top: 3px; width: 30px; }
.plist__body strong { display: block; margin-bottom: 3px; }
.plist__body span { color: var(--paper-dim); font-size: 0.94rem; }

/* ---------- Certificate specimen ---------- */
.specimen {
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(ellipse 80% 120% at 100% 0%, rgba(255,69,0,0.09), transparent 60%),
    var(--ink-1);
  padding: clamp(24px, 3vw, 40px);
  position: relative;
  overflow: hidden;
}
.specimen::after {
  content: ""; position: absolute; inset: 12px;
  border: 1px solid var(--line); border-radius: var(--radius); pointer-events: none;
}
.specimen__head { display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; position: relative; z-index: 1; }
.specimen__body { position: relative; z-index: 1; margin-top: 30px; }
.specimen__row { display: flex; justify-content: space-between; gap: 20px; padding: 11px 0; border-bottom: 1px solid var(--line); font-size: 0.9rem; }
.specimen__row span { color: var(--paper-faint); }
.specimen__row b { font-weight: 600; font-family: var(--mono); font-size: 0.85rem; }

/* ---------- Definition block ---------- */
.definition {
  border-left: 3px solid var(--accent);
  padding: 4px 0 4px clamp(18px, 3vw, 34px);
}
.definition b { color: var(--paper); }
.definition .term { font-style: normal; color: var(--accent); }

/* ---------- Verify tool ---------- */
.verify-box {
  border: 1px solid var(--line-strong); border-radius: var(--radius-lg);
  background: var(--ink-1); padding: clamp(22px, 3vw, 38px);
}
.field { display: flex; gap: 10px; flex-wrap: wrap; }
.field input {
  flex: 1; min-width: 220px;
  background: var(--ink); border: 1px solid var(--line-strong);
  border-radius: var(--radius); color: var(--paper);
  font-family: var(--mono); font-size: 0.95rem; letter-spacing: 0.05em;
  padding: 14px 16px;
}
.field input::placeholder { color: var(--paper-faint); letter-spacing: 0.02em; }
.field input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-dim); }
.verify-result { margin-top: 26px; }
.verify-result[hidden] { display: none; }
.result-card { border: 1px solid var(--line-strong); border-radius: var(--radius-lg); overflow: hidden; }
.result-card__bar { padding: 14px 22px; display: flex; align-items: center; gap: 12px; font-weight: 600; font-size: 0.92rem; }
.result-card__bar--ok { background: rgba(74,222,128,0.12); color: #8fedac; border-bottom: 1px solid rgba(74,222,128,0.3); }
.result-card__bar--bad { background: rgba(255,69,0,0.12); color: #ff8155; border-bottom: 1px solid var(--accent-line); }
.result-card__body { padding: 6px 22px 14px; }
.result-row { display: grid; grid-template-columns: 210px 1fr; gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 0.92rem; }
.result-row:last-child { border-bottom: 0; }
.result-row dt { color: var(--paper-faint); font-size: 0.8rem; letter-spacing: 0.04em; text-transform: uppercase; padding-top: 2px; }
.result-row dd { margin: 0; font-family: var(--mono); font-size: 0.88rem; word-break: break-word; }

/* ---------- Registry table ---------- */
.reg-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.reg-table th {
  text-align: left; font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--paper-faint); font-weight: 600; padding: 0 16px 14px; border-bottom: 1px solid var(--line-strong);
}
.reg-table td { padding: 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
.reg-table tbody tr:hover { background: var(--ink-2); }
.reg-table .id { font-family: var(--mono); font-size: 0.82rem; color: var(--accent); white-space: nowrap; }

/* ---------- Callout ---------- */
.callout {
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  background: rgba(255,69,0,0.035);
  padding: 20px 24px;
  font-size: 0.92rem;
  color: var(--paper-dim);
}
.callout strong { color: var(--paper); }
.callout--neutral { border-left-color: var(--line-strong); background: var(--ink-1); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding: clamp(48px, 6vw, 80px) 0 40px; margin-top: 40px; position: relative; z-index: 1; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 36px; }
.footer-grid h4 { font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--paper-faint); margin-bottom: 16px; font-weight: 600; }
.footer-grid ul { list-style: none; margin: 0; padding: 0; }
.footer-grid li { margin-bottom: 10px; }
.footer-grid a { font-size: 0.88rem; color: var(--paper-dim); }
.footer-grid a:hover { color: var(--paper); }
.footer__brand mark { height: 24px; width: auto; }
.footer__note { font-size: 0.82rem; color: var(--paper-faint); max-width: 320px; margin-top: 18px; line-height: 1.55; }
.footer-bottom {
  margin-top: 52px; padding-top: 24px; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap;
  font-size: 0.8rem; color: var(--paper-faint);
}
.footer-bottom a:hover { color: var(--paper); }

/* ---------- Legal / prose ---------- */
.prose { max-width: 780px; }
.prose h2 { margin: 2em 0 0.5em; font-size: 1.5rem; }
.prose h3 { margin: 1.8em 0 0.4em; }
.prose p, .prose li { color: var(--paper-dim); font-size: 0.98rem; }
.prose ul { padding-left: 1.2em; }
.prose li { margin-bottom: 0.5em; }
.prose a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }

/* ---------- Breadcrumb / page head ---------- */
.page-head { padding-block: clamp(56px, 9vw, 110px) clamp(30px, 5vw, 56px); border-bottom: 1px solid var(--line); }
.page-head h1 { margin-bottom: 0.3em; }
.crumb { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.08em; color: var(--paper-faint); margin-bottom: 22px; }
.crumb a:hover { color: var(--paper); }
.crumb span { color: var(--accent); }

/* ---------- Utility ---------- */
.mt-0 { margin-top: 0; } .mt-1 { margin-top: 12px; } .mt-2 { margin-top: 24px; } .mt-3 { margin-top: 40px; } .mt-4 { margin-top: 64px; }
.center { text-align: center; }
.hr { height: 1px; background: var(--line); border: 0; margin: clamp(40px,6vw,72px) 0; }
.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { left: 12px; top: 12px; background: var(--accent); color: var(--accent-ink); padding: 10px 16px; z-index: 100; border-radius: var(--radius); }

/* ---------- Responsive ---------- */
@media (max-width: 940px) {
  .hero__grid { grid-template-columns: 1fr; align-items: start; }
  .hero__aside { border-left: 0; border-top: 1px solid var(--line-strong); padding-left: 0; padding-top: 26px; }
  .laws--2, .laws--3 { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr; gap: 14px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .brand__tag { display: none; }
}
@media (max-width: 720px) {
  body { font-size: 16px; }
  .nav {
    position: fixed; inset: 74px 0 auto 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--ink-1); border-bottom: 1px solid var(--line-strong);
    padding: 12px var(--gutter) 22px;
    transform: translateY(-130%); transition: transform .26s ease;
    max-height: calc(100vh - 74px); overflow-y: auto;
  }
  .nav[data-open="true"] { transform: translateY(0); }
  .nav a { padding: 14px 8px; border-bottom: 1px solid var(--line); font-size: 1rem; }
  .nav a[aria-current="page"]::after { display: none; }
  .nav__cta { margin: 16px 0 0; text-align: center; justify-content: center; border-bottom: 0 !important; }
  .nav-toggle { display: inline-flex; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .result-row { grid-template-columns: 1fr; gap: 4px; }
  .reg-table { font-size: 0.8rem; }
  .reg-table th, .reg-table td { padding: 12px 8px; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}