/* ============================================================================
 * Memo — Landing page stylesheet  (design system « Memo UI »)
 * A sober black / white / blue palette, a single "correct-answer" green
 * accent, 1px hairline borders and RIGHT-ANGLED corners (no border-radius),
 * Roboto / Roboto Mono. Mirrors the product site's design language.
 * Mobile-first. Accessibility: visible focus, reduced-motion, AA contrast.
 * ========================================================================== */

/* --------------------------------------------------------------- tokens --- */
:root {
  --black: #0a0c10;      /* strong text / dark bands */
  --ink:   #14181f;      /* headings */
  --body:  #3f4650;      /* body text */
  --muted: #6b7280;      /* secondary text (WCAG AA >= 4.5:1) */
  --faint: #5f6f80;      /* tertiary text (WCAG AA >= 4.5:1) */
  --line:  #e3e6ea;      /* hairline borders */
  --line-2:#cdd2d9;      /* borders on hover */
  --bg:    #ffffff;
  --soft:  #f6f7f9;
  --soft-2:#eef1f4;
  --blue:   #0b6fc2;     /* primary accent */
  --blue-d: #084e8c;     /* primary, hover */
  --blue-t: #eaf2fa;     /* primary tint */
  --ok:    #157347;      /* the one business accent: correct answer = green */
  --ok-bg: #e9f5ee;
  --ok-d:  #0f5c38;
  --font: "Roboto", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "Roboto Mono", ui-monospace, Menlo, Consolas, monospace;
  --max: 1180px;
  --top: 66px;
  --shadow-1: 0 1px 2px rgba(10, 12, 16, .06);
  --shadow-2: 0 6px 20px rgba(10, 12, 16, .08);
  --shadow-3: 0 18px 46px rgba(10, 12, 16, .16);
  --ease: cubic-bezier(.2, .7, .3, 1);
  --speed: 180ms;
}

/* ----------------------------------------------------------------- base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--top) + 16px);
}

body {
  background: var(--bg);
  color: var(--body);
  font: 400 16px/1.65 var(--font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: var(--blue); text-decoration: none; transition: color var(--speed) var(--ease); }
a:hover { color: var(--blue-d); }

h1, h2, h3, h4 { color: var(--ink); line-height: 1.18; letter-spacing: -.02em; font-weight: 700; }
ul { list-style: none; }

:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }

code { font: 500 13px/1.5 var(--mono); }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  padding: 10px 18px; background: var(--black); color: #fff; font-weight: 600;
}
.skip-link:focus { left: 8px; top: 8px; color: #fff; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ----------------------------------------------------------- typography --- */
.h2 { margin-top: 10px; color: var(--black); font-size: clamp(22px, 2.7vw, 32px); letter-spacing: -.02em; line-height: 1.15; }
.lead { margin-top: 14px; color: var(--body); font-size: 17px; }
.muted { color: var(--muted); }
.mono { font-family: var(--mono); }

.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  color: var(--blue); font-size: 12.5px; font-weight: 700;
  letter-spacing: .14em; text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 22px; height: 2px; background: currentColor; }

.section-head { max-width: 820px; }
.section-head--center { margin: 0 auto; text-align: center; }
.section-head--center .lead { margin-left: auto; margin-right: auto; }

/* ------------------------------------------------------------- buttons ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border: 1px solid transparent; background: none; color: inherit;
  font: 600 14.5px/1.2 var(--font); cursor: pointer; white-space: nowrap;
  transition: background var(--speed) var(--ease), border-color var(--speed) var(--ease), color var(--speed) var(--ease);
}
.btn--primary { background: var(--blue); border-color: var(--blue); color: #fff; }
.btn--primary:hover { background: var(--blue-d); border-color: var(--blue-d); color: #fff; }
.btn--ghost { background: #fff; border-color: var(--line-2); color: var(--ink); }
.btn--ghost:hover { border-color: var(--blue); color: var(--blue); }
.btn--white { background: #fff; border-color: #fff; color: var(--blue-d); }
.btn--white:hover { background: var(--blue-t); border-color: var(--blue-t); color: var(--blue-d); }
.btn--lg { padding: 15px 28px; font-size: 15.5px; }
.btn__icon { width: 18px; height: 18px; flex: none; }
.cta-card .btn--ghost { background: transparent; border-color: rgba(255, 255, 255, .6); color: #fff; }
.cta-card .btn--ghost:hover { background: rgba(255, 255, 255, .14); border-color: #fff; color: #fff; }

/* -------------------------------------------------------------- header ---- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .92);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner { height: var(--top); display: flex; align-items: center; gap: 24px; position: relative; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); }
.brand:hover { color: var(--ink); }
.brand__logo { width: 30px; height: 30px; }
.brand__name { font-size: 19px; font-weight: 800; letter-spacing: -.02em; }
.brand__badge { padding: 2px 7px; background: var(--soft-2); color: var(--muted); font: 700 11px/1.5 var(--mono); }
.site-nav { display: flex; align-items: center; gap: 26px; margin-left: 20px; }
.site-nav a { position: relative; color: var(--body); font-size: 15px; font-weight: 500; padding: 4px 0; }
.site-nav a::after { content: ""; position: absolute; left: 0; bottom: -2px; height: 2px; width: 0; background: var(--blue); transition: width var(--speed) var(--ease); }
.site-nav a:hover, .site-nav a.is-active { color: var(--ink); }
.site-nav a:hover::after, .site-nav a.is-active::after { width: 100%; }
.header-actions { display: flex; align-items: center; gap: 12px; margin-left: auto; }
.nav-toggle { display: none; width: 42px; height: 42px; padding: 0; align-items: center; justify-content: center; background: #fff; border: 1px solid var(--line-2); cursor: pointer; }
.nav-toggle__bar, .nav-toggle__bar::before, .nav-toggle__bar::after { display: block; width: 20px; height: 2px; background: var(--ink); content: ""; }
.nav-toggle__bar { position: relative; }
.nav-toggle__bar::before { position: absolute; top: -6px; }
.nav-toggle__bar::after { position: absolute; top: 6px; }

/* ---------------------------------------------------------------- hero ---- */
.hero { padding: 72px 0 64px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.hero__pill { display: inline-flex; align-items: center; gap: 8px; padding: 6px 13px; background: var(--soft); border: 1px solid var(--line); color: var(--muted); font-size: 13px; font-weight: 500; }
.hero__pill .dot { width: 7px; height: 7px; background: var(--ok); }
.hero h1 { margin-top: 20px; color: var(--black); font-size: clamp(34px, 4.6vw, 56px); line-height: 1.06; letter-spacing: -.03em; }
.hero h1 .accent { color: var(--blue); }
.hero__lead { margin-top: 20px; font-size: 18px; line-height: 1.6; max-width: 560px; color: var(--body); }
.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 32px; }
.hero__trust { display: flex; flex-wrap: wrap; gap: 10px 26px; margin-top: 28px; }
.hero__trust li { display: inline-flex; align-items: center; gap: 8px; color: var(--muted); font-size: 14px; }
.hero__trust svg { width: 16px; height: 16px; color: var(--ok); flex: none; }
.hero__platforms { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 26px; }
.hero__platforms > span:first-child { color: var(--faint); font-size: 13px; font-weight: 600; text-transform: uppercase; letter-spacing: .08em; }
.chip { padding: 5px 12px; background: var(--soft); border: 1px solid var(--line); color: var(--ink); font-weight: 700; font-size: 13.5px; }

/* -------------------------------------------------------- hero mockup ---- */
.mock { position: relative; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow-2); }
.mock__bar { display: flex; align-items: center; gap: 8px; padding: 11px 14px; background: var(--soft); border-bottom: 1px solid var(--line); }
.mock__dot { width: 10px; height: 10px; background: var(--line-2); }
.mock__url { flex: 1; margin-left: 6px; padding: 5px 12px; background: #fff; border: 1px solid var(--line); color: var(--faint); font: 500 12px/1.4 var(--mono); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mock__live { display: inline-flex; align-items: center; gap: 6px; color: var(--ok); font: 700 11px/1 var(--mono); letter-spacing: .06em; }
.mock__live .dot { width: 7px; height: 7px; background: var(--ok); animation: pulse 1.6s infinite; }
.mock__body { padding: 22px; }
.mock__q { font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--faint); margin-bottom: 6px; }
.mock__question { font-size: 18px; font-weight: 700; color: var(--ink); margin-bottom: 16px; }
.mock__choices { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.mock__choice { padding: 13px 14px; border: 1px solid var(--line); background: #fff; color: var(--body); font-size: 14.5px; font-weight: 500; display: flex; align-items: center; gap: 10px; }
.mock__choice .key { width: 22px; height: 22px; flex: none; display: grid; place-items: center; border: 1px solid var(--line-2); color: var(--muted); font: 700 12px/1 var(--mono); }
.mock__choice.is-correct { background: var(--ok-bg); border-color: var(--ok); color: var(--ok-d); font-weight: 600; }
.mock__choice.is-correct .key { background: var(--ok); border-color: var(--ok); color: #fff; }
.mock__choice.is-correct .tick { margin-left: auto; width: 18px; height: 18px; color: var(--ok); }
.mock__solver { position: static; display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 12px 22px; background: var(--black); color: #fff; font-size: 13px; font-weight: 600; }
.mock__solver .mono { color: #9aa1ab; font: 600 12px/1 var(--mono); }
.mock__solver .ok { color: #4ade80; }

@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .35; } }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }

/* --------------------------------------------------------------- logos ---- */
.logos { padding: 28px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--soft); }
.logos__inner { display: flex; align-items: center; justify-content: center; gap: 12px 28px; flex-wrap: wrap; }
.logos__label { color: var(--muted); font-size: 13.5px; font-weight: 500; }
.logos__list { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.logos__list .chip { padding: 6px 14px; border: 1px solid var(--line-2); background: #fff; color: var(--ink); font-weight: 700; font-size: 14px; }

/* ------------------------------------------------------------- sections --- */
.section { padding: 84px 0; }
.section--soft { background: var(--soft); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }

/* --------------------------------------------------------------- cards ---- */
.card { padding: 28px; background: #fff; border: 1px solid var(--line); transition: border-color var(--speed) var(--ease), box-shadow var(--speed) var(--ease), transform var(--speed) var(--ease); }
.card:hover { border-color: var(--line-2); box-shadow: var(--shadow-2); transform: translateY(-3px); }
.card__icon { width: 46px; height: 46px; display: grid; place-items: center; background: var(--blue-t); color: var(--blue); margin-bottom: 18px; }
.card__icon svg { width: 23px; height: 23px; }
.card__icon--ok { background: var(--ok-bg); color: var(--ok); }
.card h3 { font-size: 18.5px; }
.card p { margin-top: 10px; color: var(--body); font-size: 15px; }
.card__tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.tag { padding: 4px 10px; background: var(--soft); border: 1px solid var(--line); color: var(--muted); font: 600 12px/1.6 var(--mono); }

/* --------------------------------------------------------------- steps ---- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.step { position: relative; padding: 28px; background: #fff; border: 1px solid var(--line); }
.step__num { display: inline-grid; place-items: center; width: 40px; height: 40px; background: var(--black); color: #fff; font: 800 17px/1 var(--mono); margin-bottom: 16px; }
.step h3 { font-size: 18px; }
.step p { margin-top: 10px; color: var(--body); font-size: 15px; }
.step p code { background: var(--soft-2); padding: 1px 6px; color: var(--ink); }
.step .arrow { position: absolute; top: 30px; right: 26px; color: var(--line-2); }
.step .arrow svg { width: 22px; height: 22px; }

/* ---------------------------------------------------------------- band ---- */
.band { padding: 72px 0; background: var(--black); color: #fff; }
.band__inner { display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: center; }
.band .h2 { color: #fff; }
.band .lead { color: #b9c0c9; }
.band .eyebrow { color: #4ade80; }
.kpis { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: rgba(255, 255, 255, .14); }
.kpi { padding: 26px 22px; background: var(--black); }
.kpi__value { color: #fff; font-size: clamp(30px, 3.4vw, 40px); font-weight: 800; letter-spacing: -.02em; line-height: 1; }
.kpi__value .u { color: #4ade80; font-size: .55em; }
.kpi__label { margin-top: 10px; color: #9aa1ab; font-size: 13.5px; }

/* ------------------------------------------------------------ shortcuts --- */
.keys { display: grid; gap: 12px; max-width: 720px; }
.key-row { display: flex; align-items: center; gap: 16px; padding: 16px 18px; background: #fff; border: 1px solid var(--line); }
.key-cap { flex: none; width: 40px; height: 40px; display: grid; place-items: center; background: var(--soft-2); border: 1px solid var(--line-2); color: var(--ink); font: 700 15px/1 var(--mono); }
.key-row .desc { color: var(--body); font-size: 15px; }
.key-row .desc b { color: var(--ink); }

/* ---------------------------------------------------------- installation -- */
.install-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: start; }
.checklist { display: grid; gap: 14px; }
.checklist li { display: flex; gap: 14px; }
.checklist .n { flex: none; width: 28px; height: 28px; display: grid; place-items: center; background: var(--blue); color: #fff; font: 700 13px/1 var(--mono); }
.checklist .txt { color: var(--body); font-size: 15px; padding-top: 4px; }
.checklist .txt b { color: var(--ink); }
.checklist .txt code { background: var(--soft-2); padding: 1px 6px; color: var(--ink); }
.install-panel { padding: 28px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow-2); }
.install-panel h3 { font-size: 20px; }
.install-panel .note { margin: 18px 0; padding: 14px 16px; background: var(--soft); border-left: 3px solid var(--blue); color: var(--muted); font-size: 14px; }
.install-panel .btn { width: 100%; }
.install-panel .sub { margin-top: 12px; text-align: center; font-size: 13.5px; color: var(--muted); }

/* -------------------------------------------------------- documentation -- */
.doc-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.doc-card { display: block; padding: 26px; background: #fff; border: 1px solid var(--line); color: var(--body); transition: border-color var(--speed) var(--ease), box-shadow var(--speed) var(--ease); }
.doc-card:hover { color: var(--body); border-color: var(--blue); box-shadow: var(--shadow-2); }
.doc-card .num { display: block; color: var(--line-2); font: 800 15px/1 var(--mono); margin-bottom: 14px; }
.doc-card h3 { color: var(--ink); font-size: 18px; }
.doc-card p { margin-top: 8px; font-size: 15px; }
.doc-card p code { background: var(--soft-2); padding: 1px 6px; color: var(--ink); }
.doc-card .go { display: inline-flex; align-items: center; gap: 8px; margin-top: 16px; color: var(--blue); font-size: 14px; font-weight: 600; }
.doc-card .go svg { width: 16px; height: 16px; transition: transform var(--speed) var(--ease); }
.doc-card:hover .go svg { transform: translateX(4px); }

/* ------------------------------------------------------------------ faq --- */
.faq { max-width: 820px; display: grid; gap: 12px; }
.faq-item { background: #fff; border: 1px solid var(--line); }
.faq-q { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 20px 22px; background: none; border: 0; cursor: pointer; text-align: left; color: var(--ink); font: 700 16px/1.4 var(--font); transition: color var(--speed) var(--ease); }
.faq-q:hover { color: var(--blue); }
.faq-q .chev { flex: none; width: 20px; height: 20px; color: var(--muted); transition: transform var(--speed) var(--ease); }
.faq-q[aria-expanded="true"] .chev { transform: rotate(180deg); }
.faq-a { padding: 0 22px 22px; }
.faq-a p { color: var(--body); font-size: 15px; }
.faq-a p + p { margin-top: 10px; }
.faq-a code { background: var(--soft-2); padding: 1px 6px; color: var(--ink); }

/* --------------------------------------------------------------- final --- */
.cta-band { padding: 92px 0; }
.cta-card { padding: 56px 48px; text-align: center; background: var(--black); color: #fff; }
.cta-card .h2 { color: #fff; margin-top: 0; }
.cta-card p { max-width: 640px; margin: 16px auto 0; color: #b9c0c9; font-size: 17px; }
.cta-card .btns { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; margin-top: 30px; }

/* -------------------------------------------------------------- footer ---- */
.site-footer { padding: 64px 0 28px; background: #fff; border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; }
.footer-brand .brand__name { color: var(--ink); }
.footer-brand p { margin-top: 14px; color: var(--muted); font-size: 14.5px; max-width: 320px; }
.footer-col h4 { font-size: 13px; text-transform: uppercase; letter-spacing: .1em; color: var(--faint); margin-bottom: 16px; }
.footer-col ul { display: grid; gap: 10px; }
.footer-col a { color: var(--body); font-size: 14.5px; }
.footer-col a:hover { color: var(--blue); }
.footer-bottom { margin-top: 44px; padding-top: 22px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; color: var(--muted); font-size: 13.5px; }
.footer-bottom nav { display: flex; flex-wrap: wrap; gap: 18px; }
.footer-bottom a { color: var(--muted); }
.footer-bottom a:hover { color: var(--blue); }

/* --------------------------------------------------------- status pill ---- */
.status-pill { display: inline-flex; align-items: center; gap: 8px; padding: 5px 11px; border: 1px solid var(--line); background: #fff; color: var(--muted); font: 600 12.5px/1.4 var(--mono); cursor: default; }
.status-pill .dot { width: 8px; height: 8px; background: var(--line-2); }
.status-pill[data-state="ok"] { color: var(--ok); border-color: var(--ok); }
.status-pill[data-state="ok"] .dot { background: var(--ok); }
.status-pill[data-state="down"] { color: var(--black); border-color: var(--black); }
.status-pill[data-state="down"] .dot { background: var(--black); }

/* ----------------------------------------------------------- responsive --- */
@media (max-width: 1040px) {
  .header-inner { gap: 16px; }
  .site-nav { gap: 20px; margin-left: 12px; }
  .site-nav a { font-size: 14.5px; }
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero__lead { max-width: none; }
  .install-grid { grid-template-columns: 1fr; gap: 36px; }
  .band__inner { grid-template-columns: 1fr; gap: 36px; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
}

@media (max-width: 860px) {
  .nav-toggle { display: grid; }
  .header-actions .btn { display: none; }
  .site-nav {
    position: absolute; top: var(--top); left: 0; right: 0; z-index: 99;
    flex-direction: column; align-items: stretch; gap: 0;
    padding: 8px 20px 20px; margin: 0;
    background: #fff; border-bottom: 1px solid var(--line); box-shadow: var(--shadow-2);
    max-height: 0; overflow: hidden; visibility: hidden; opacity: 0;
    transition: max-height var(--speed) var(--ease), opacity var(--speed) var(--ease), visibility var(--speed);
  }
  .site-nav.is-open { max-height: 70vh; overflow: auto; visibility: visible; opacity: 1; }
  .site-nav a { padding: 13px 0; border-bottom: 1px solid var(--line); font-size: 15.5px; }
  .site-nav a::after { display: none; }
  .site-nav a:last-child { border-bottom: 0; }
  .header-actions .status-pill { display: none; }
}

@media (max-width: 760px) {
  .section { padding: 60px 0; }
  .hero { padding: 52px 0 48px; }
  .band { padding: 56px 0; }
  .final-cta { padding: 64px 0; }
  .cta-card { padding: 42px 22px; }
  .grid-3, .steps, .doc-grid, .kpis { grid-template-columns: 1fr; }
  .mock__choices { grid-template-columns: 1fr; }
  .mock__solver { flex-wrap: wrap; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .footer-bottom { justify-content: center; text-align: center; }
  .footer-bottom nav { justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; scroll-behavior: auto; }
}