/* ==========================================================================
   QuarterSmart marketing site. Production stylesheet.
   Translated from the QuarterSmart Design System (Claude Design) into static,
   accessible CSS. Dark theme, single mint accent, Space Grotesk + JetBrains Mono.
   ========================================================================== */

/* ----- Self-hosted webfonts (latin subset; no third-party request) ------ */
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 300; font-display: swap; src: url("/assets/fonts/jetbrains-mono-300.woff2") format("woff2"); }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 400; font-display: swap; src: url("/assets/fonts/jetbrains-mono-400.woff2") format("woff2"); }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 500; font-display: swap; src: url("/assets/fonts/jetbrains-mono-500.woff2") format("woff2"); }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 600; font-display: swap; src: url("/assets/fonts/jetbrains-mono-600.woff2") format("woff2"); }
@font-face { font-family: 'Space Grotesk'; font-style: normal; font-weight: 300; font-display: swap; src: url("/assets/fonts/space-grotesk-300.woff2") format("woff2"); }
@font-face { font-family: 'Space Grotesk'; font-style: normal; font-weight: 400; font-display: swap; src: url("/assets/fonts/space-grotesk-400.woff2") format("woff2"); }
@font-face { font-family: 'Space Grotesk'; font-style: normal; font-weight: 500; font-display: swap; src: url("/assets/fonts/space-grotesk-500.woff2") format("woff2"); }
@font-face { font-family: 'Space Grotesk'; font-style: normal; font-weight: 600; font-display: swap; src: url("/assets/fonts/space-grotesk-600.woff2") format("woff2"); }
@font-face { font-family: 'Space Grotesk'; font-style: normal; font-weight: 700; font-display: swap; src: url("/assets/fonts/space-grotesk-700.woff2") format("woff2"); }

/* ----- Tokens ----------------------------------------------------------- */
:root {
  /* Base palette */
  --qs-mint: #00e5a0;
  --qs-mint-bright: #1ffdb3;
  --qs-mint-ink: #04130d;
  --qs-black: #060608;
  --qs-surface-1: #0c1016;
  --qs-surface-2: #11161e;
  --qs-surface-3: #161c26;
  --qs-white: #f0f4f8;
  --qs-muted: #8b95a5;
  --qs-faint: #79828f;

  /* Mint tints */
  --qs-mint-08: rgba(0, 229, 160, 0.08);
  --qs-mint-12: rgba(0, 229, 160, 0.12);
  --qs-mint-20: rgba(0, 229, 160, 0.20);
  --qs-mint-40: rgba(0, 229, 160, 0.40);

  /* Borders */
  --qs-border: rgba(255, 255, 255, 0.08);
  --qs-border-strong: rgba(255, 255, 255, 0.16);
  --qs-border-mint: rgba(0, 229, 160, 0.32);

  /* Semantic aliases */
  --bg-page: var(--qs-black);
  --surface-card: var(--qs-surface-1);
  --surface-raised: var(--qs-surface-2);
  --surface-inset: var(--qs-surface-3);
  --text-strong: var(--qs-white);
  --text-body: var(--qs-white);
  --text-muted: var(--qs-muted);
  --text-faint: var(--qs-faint);
  --text-accent: var(--qs-mint);
  --accent: var(--qs-mint);
  --accent-bright: var(--qs-mint-bright);
  --accent-ink: var(--qs-mint-ink);
  --border-hairline: var(--qs-border);
  --border-card: var(--qs-border);
  --border-focus: var(--qs-mint);

  /* Type */
  --font-display: "Space Grotesk", system-ui, -apple-system, sans-serif;
  --font-body: "Space Grotesk", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", monospace;
  --fs-eyebrow: 0.75rem;
  --fs-caption: 0.8125rem;
  --fs-small: 0.875rem;
  --fs-body: 1.0625rem;
  --fs-body-lg: 1.1875rem;
  --fs-h4: 1.25rem;
  --fs-h3: 1.5rem;
  --fs-h2: 2rem;
  --fs-h1: 2.75rem;
  --fs-display: 3.5rem;
  --ls-eyebrow: 0.14em;
  --ls-label: 0.04em;
  --ls-display: -0.02em;
  --ls-heading: -0.01em;

  /* Spacing (4px grid) */
  --sp-1: 0.25rem;  --sp-2: 0.5rem;  --sp-3: 0.75rem; --sp-4: 1rem;
  --sp-5: 1.5rem;   --sp-6: 2rem;    --sp-7: 3rem;    --sp-8: 4rem;
  --sp-9: 6rem;     --sp-10: 8rem;
  --container-prose: 760px;
  --container: 1120px;
  --container-wide: 1280px;
  --gutter: var(--sp-5);
  --radius-sm: 6px;  --radius-md: 10px; --radius-lg: 16px;
  --radius-xl: 24px; --radius-pill: 999px;

  /* Effects */
  --shadow-card: 0 1px 0 rgba(255,255,255,0.03) inset, 0 8px 24px rgba(0,0,0,0.4);
  --shadow-raised: 0 12px 40px rgba(0,0,0,0.55);
  --glow-mint: 0 0 0 1px var(--qs-border-mint), 0 8px 32px rgba(0,229,160,0.18);
  --glow-mint-strong: 0 0 28px rgba(0,229,160,0.35);
  --ease-out: cubic-bezier(0.2, 0.8, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --dur-fast: 120ms;
  --dur: 200ms;
  --dur-slow: 360ms;
}

@media (min-width: 768px) {
  :root {
    --fs-body: 1.125rem;
    --fs-h1: 3.25rem;
    --fs-display: 4.5rem;
  }
}

/* ----- Reset / base ----------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg-page);
  color: var(--text-body);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-bright); }
h1, h2, h3, h4, p { margin: 0; }
::selection { background: var(--qs-mint-20); color: var(--text-strong); }
:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--qs-black), 0 0 0 4px var(--qs-mint);
  border-radius: var(--radius-sm);
}
.qs-skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: var(--accent-ink);
  padding: 10px 16px; border-radius: var(--radius-md);
  font-family: var(--font-display); font-weight: 600; z-index: 100;
}
.qs-skip:focus { left: var(--gutter); top: 10px; }
.qs-visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ----- Layout ----------------------------------------------------------- */
.qs-wrap { max-width: var(--container); margin: 0 auto; padding-left: var(--gutter); padding-right: var(--gutter); }
.qs-wrap--prose { max-width: var(--container-prose); }
.qs-wrap--wide { max-width: var(--container-wide); }
.qs-section { padding-top: var(--sp-8); padding-bottom: var(--sp-8); }
.qs-section--lg { padding-top: var(--sp-9); padding-bottom: var(--sp-9); }
.qs-bordered { border-top: 1px solid var(--border-hairline); }
.qs-mt-5 { margin-top: var(--sp-5); }
.qs-mt-6 { margin-top: var(--sp-6); }
.qs-mt-7 { margin-top: var(--sp-7); }

/* ----- Type helpers ----------------------------------------------------- */
.qs-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: var(--fs-eyebrow); font-weight: 500;
  letter-spacing: var(--ls-eyebrow); text-transform: uppercase; color: var(--text-accent);
}
.qs-eyebrow--muted { color: var(--text-muted); }
.qs-h1 { font-family: var(--font-display); font-size: var(--fs-h1); font-weight: 700; line-height: 1.06; letter-spacing: var(--ls-display); color: var(--text-strong); }
.qs-display { font-family: var(--font-display); font-size: var(--fs-display); font-weight: 700; line-height: 1.02; letter-spacing: var(--ls-display); color: var(--text-strong); }
.qs-h2 { font-family: var(--font-display); font-size: var(--fs-h2); font-weight: 700; line-height: 1.15; letter-spacing: var(--ls-heading); color: var(--text-strong); }
.qs-h3 { font-family: var(--font-display); font-size: var(--fs-h3); font-weight: 600; line-height: 1.2; letter-spacing: var(--ls-heading); color: var(--text-strong); }
.qs-h4 { font-family: var(--font-display); font-size: var(--fs-h4); font-weight: 600; color: var(--text-strong); }
.qs-lede { font-size: var(--fs-body-lg); line-height: 1.5; color: var(--text-strong); }
.qs-muted { color: var(--text-muted); }
.qs-section-head { display: flex; flex-direction: column; gap: 14px; margin-bottom: var(--sp-6); max-width: 56ch; }
.qs-section-head .qs-h2 { max-width: 22ch; }
.qs-section-head p { font-size: var(--fs-body); line-height: 1.6; color: var(--text-muted); max-width: 56ch; }
.qs-section-head--center { align-items: center; text-align: center; }

/* Prose (long-form, 760px) */
.qs-prose { max-width: var(--container-prose); margin: 0 auto; }
.qs-prose h2 { font-family: var(--font-display); font-size: var(--fs-h2); font-weight: 700; line-height: 1.2; letter-spacing: var(--ls-heading); color: var(--text-strong); margin: 1.6em 0 0.5em; }
.qs-prose > :first-child { margin-top: 0; }
.qs-prose h2:first-child { margin-top: 0; }
.qs-prose h3 { font-family: var(--font-display); font-size: var(--fs-h4); font-weight: 600; color: var(--text-strong); margin: 1.4em 0 0.4em; }
.qs-prose p { font-size: var(--fs-body); line-height: 1.7; color: var(--text-muted); margin: 0 0 1em; max-width: 64ch; }
.qs-prose p strong { color: var(--text-strong); font-weight: 600; }
.qs-prose .qs-eyebrow { margin-bottom: 6px; }

/* ----- Buttons ---------------------------------------------------------- */
.qs-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--font-display); font-weight: 600; line-height: 1; letter-spacing: 0.005em;
  border-radius: var(--radius-md); border: 1px solid transparent; cursor: pointer;
  text-decoration: none; white-space: nowrap; padding: 12px 22px; font-size: 15px;
  transition: background var(--dur) var(--ease-out), border-color var(--dur) var(--ease-out),
              color var(--dur) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}
.qs-btn:active { transform: translateY(1px); }
.qs-btn--sm { padding: 8px 16px; font-size: 14px; }
.qs-btn--lg { padding: 15px 28px; font-size: 16px; }
.qs-btn--primary { background: var(--accent); color: var(--accent-ink); box-shadow: var(--glow-mint); }
.qs-btn--primary:hover { background: var(--accent-bright); color: var(--accent-ink); }
.qs-btn--secondary { background: transparent; color: var(--text-strong); border-color: var(--border-strong); }
.qs-btn--secondary:hover { border-color: var(--accent); color: var(--accent); }
.qs-btn--ghost { background: transparent; color: var(--text-muted); }
.qs-btn--ghost:hover { color: var(--text-strong); }
.qs-btn--full { width: 100%; }
.qs-btn .qs-ico { font-family: var(--font-mono); opacity: 0.9; }
.qs-cta-row { display: flex; gap: 12px; flex-wrap: wrap; }

/* ----- Badge / trust row ------------------------------------------------ */
.qs-badge {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--font-mono); font-size: 12px; font-weight: 500; letter-spacing: 0.04em;
  line-height: 1; padding: 6px 11px; border-radius: var(--radius-pill);
  background: transparent; color: var(--text-muted); border: 1px solid var(--border-strong);
}
.qs-badge--mint { background: var(--qs-mint-12); color: var(--accent-bright); border-color: var(--border-mint); }
.qs-badge .qs-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); flex: none; }
.qs-trust { display: flex; flex-wrap: wrap; gap: 10px; }

/* ----- Cards ------------------------------------------------------------ */
.qs-card {
  display: block; background: var(--surface-card); border: 1px solid var(--border-card);
  border-radius: var(--radius-lg); padding: 28px; color: inherit;
  box-shadow: var(--shadow-card);
  transition: border-color var(--dur) var(--ease-out), transform var(--dur) var(--ease-out),
              background var(--dur) var(--ease-out);
}
.qs-card--glow { box-shadow: var(--glow-mint); }
.qs-card--interactive:hover {
  border-color: var(--border-mint); transform: translateY(-2px); background: var(--surface-raised);
}
a.qs-card { text-decoration: none; }

/* Feature card (numbered) */
.qs-feature { display: flex; flex-direction: column; gap: 12px; height: 100%; }
.qs-feature__top { display: flex; align-items: center; gap: 12px; }
.qs-numbox {
  font-family: var(--font-mono); font-size: 13px; font-weight: 500; color: var(--accent);
  border: 1px solid var(--border-mint); background: var(--qs-mint-08); border-radius: var(--radius-sm);
  width: 30px; height: 30px; display: inline-flex; align-items: center; justify-content: center; flex: none;
}
.qs-feature p { margin: 0; font-size: var(--fs-small); line-height: 1.6; color: var(--text-muted); flex: 1; }
.qs-cardlink { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.04em; color: var(--accent); display: inline-flex; align-items: center; gap: 6px; }

/* Case study card */
.qs-case { display: flex; flex-direction: column; gap: 18px; }
.qs-case__head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.qs-case__client { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-faint); }
.qs-tags { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.qs-tag { font-family: var(--font-mono); font-size: 11px; color: var(--text-muted); border: 1px solid var(--border-hairline); border-radius: var(--radius-pill); padding: 3px 9px; }
.qs-case p { margin: 0; font-size: var(--fs-small); line-height: 1.6; color: var(--text-muted); }
.qs-case__stats { display: flex; gap: 28px; flex-wrap: wrap; padding-top: 16px; border-top: 1px solid var(--border-hairline); }

/* Stat */
.qs-stat { display: flex; flex-direction: column; gap: 6px; }
.qs-stat__value { font-family: var(--font-mono); font-weight: 500; line-height: 1; letter-spacing: -0.01em; color: var(--accent); font-size: 44px; }
.qs-stat--sm .qs-stat__value { font-size: 32px; }
.qs-stat--lg .qs-stat__value { font-size: 60px; }
.qs-stat__label { font-family: var(--font-display); font-size: 15px; line-height: 1.4; color: var(--text-strong); max-width: 30ch; }
.qs-proof {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; padding: var(--sp-6);
  background: var(--surface-card); border: 1px solid var(--border-hairline); border-radius: var(--radius-xl);
}

/* ----- Accordion (native details) -------------------------------------- */
.qs-accordion { border-top: 1px solid var(--border-hairline); }
.qs-accordion details { border-bottom: 1px solid var(--border-hairline); }
.qs-accordion summary {
  list-style: none; cursor: pointer; display: flex; align-items: flex-start;
  justify-content: space-between; gap: 20px; padding: 22px 4px;
  font-family: var(--font-display); font-size: var(--fs-body); font-weight: 600; line-height: 1.4;
  color: var(--text-body); transition: color var(--dur) var(--ease-out);
}
.qs-accordion summary::-webkit-details-marker { display: none; }
.qs-accordion summary:hover { color: var(--text-strong); }
.qs-accordion details[open] summary { color: var(--text-strong); }
.qs-accordion .qs-pm { flex: none; width: 22px; height: 22px; position: relative; margin-top: 2px; color: var(--accent); }
.qs-accordion .qs-pm::before, .qs-accordion .qs-pm::after { content: ""; position: absolute; background: currentColor; }
.qs-accordion .qs-pm::before { top: 50%; left: 3px; right: 3px; height: 1.5px; transform: translateY(-50%); }
.qs-accordion .qs-pm::after { left: 50%; top: 3px; bottom: 3px; width: 1.5px; transform: translateX(-50%) scaleY(1); transition: transform var(--dur) var(--ease-out); }
.qs-accordion details[open] .qs-pm::after { transform: translateX(-50%) scaleY(0); }
.qs-accordion .qs-answer { margin: 0; padding: 0 4px 24px; max-width: 64ch; font-size: var(--fs-small); line-height: 1.65; color: var(--text-muted); }

/* ----- Nav -------------------------------------------------------------- */
.qs-nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(6,6,8,0.78); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-hairline);
}
.qs-nav__bar { max-width: var(--container); margin: 0 auto; padding: 16px var(--gutter); display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.qs-logo { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; }
.qs-logo__mark { width: 26px; height: 26px; flex: none; }
.qs-logo__word { font-family: var(--font-display); font-weight: 700; font-size: 17px; letter-spacing: 0.005em; color: var(--text-strong); }
.qs-nav__links { display: flex; align-items: center; gap: 26px; }
.qs-nav__links a { font-family: var(--font-display); font-size: 14px; font-weight: 500; color: var(--text-muted); text-decoration: none; transition: color var(--dur) var(--ease-out); }
.qs-nav__links a:hover { color: var(--text-strong); }
.qs-nav__links a[aria-current="page"] { color: var(--accent); }
.qs-nav__cta { display: flex; align-items: center; }
.qs-nav__toggle {
  display: none; background: transparent; border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  width: 40px; height: 40px; cursor: pointer; color: var(--text-strong);
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.qs-nav__toggle span { width: 16px; height: 1.5px; background: currentColor; transition: transform var(--dur) var(--ease-out), opacity var(--dur) var(--ease-out); }
.qs-nav__drawer { display: none; flex-direction: column; gap: 4px; padding: 8px var(--gutter) 22px; border-top: 1px solid var(--border-hairline); }
.qs-nav__drawer a { font-family: var(--font-display); font-size: 16px; font-weight: 500; color: var(--text-muted); text-decoration: none; padding: 12px 0; border-bottom: 1px solid var(--border-hairline); }
.qs-nav__drawer a[aria-current="page"] { color: var(--accent); }
.qs-nav__drawer .qs-btn { margin-top: 16px; }
.qs-nav[data-open="true"] .qs-nav__drawer { display: flex; }
.qs-nav[data-open="true"] .qs-nav__toggle span:first-child { transform: translateY(3.25px) rotate(45deg); }
.qs-nav[data-open="true"] .qs-nav__toggle span:last-child { transform: translateY(-3.25px) rotate(-45deg); }

/* ----- Footer ----------------------------------------------------------- */
.qs-footer { border-top: 1px solid var(--border-hairline); background: var(--bg-page); }
.qs-footer__inner { max-width: var(--container); margin: 0 auto; padding: var(--sp-8) var(--gutter) var(--sp-6); }
.qs-footer__grid { display: grid; grid-template-columns: minmax(220px, 1.4fr) repeat(auto-fit, minmax(140px, 1fr)); gap: 32px; }
.qs-footer__brand { display: flex; flex-direction: column; gap: 16px; max-width: 320px; }
.qs-footer__brand p { margin: 0; font-size: 14px; line-height: 1.6; color: var(--text-muted); }
.qs-footer__brand a.qs-mail { font-family: var(--font-display); font-size: 14px; color: var(--accent); }
.qs-footer__col { display: flex; flex-direction: column; gap: 12px; }
.qs-footer__col h2 { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-faint); font-weight: 500; }
.qs-footer__col a { font-family: var(--font-display); font-size: 14px; color: var(--text-muted); text-decoration: none; transition: color var(--dur) var(--ease-out); }
.qs-footer__col a:hover { color: var(--accent); }
.qs-footer__meta { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; margin-top: var(--sp-7); padding-top: var(--sp-5); border-top: 1px solid var(--border-hairline); }
.qs-footer__meta .qs-tag-line { font-family: var(--font-mono); font-size: 13px; color: var(--accent); }
.qs-footer__meta .qs-copy { font-family: var(--font-mono); font-size: 12px; color: var(--text-faint); }
.qs-footer__meta .qs-copy a { color: var(--text-muted); text-decoration: none; }
.qs-footer__meta .qs-copy a:hover { color: var(--accent); }

/* ----- Hero / page header / motif -------------------------------------- */
.qs-hero, .qs-pagehead { position: relative; overflow: hidden; border-bottom: 1px solid var(--border-hairline); }
.qs-hero__inner { max-width: var(--container); margin: 0 auto; padding: var(--sp-9) var(--gutter) var(--sp-8); position: relative; }
.qs-pagehead__inner { max-width: var(--container); margin: 0 auto; padding: var(--sp-8) var(--gutter) var(--sp-7); position: relative; }
.qs-hero__eyebrow { max-width: 20ch; }
.qs-hero h1 { margin-top: 20px; max-width: 16ch; }
.qs-hero__lede { margin-top: 24px; max-width: 54ch; }
.qs-hero__sub { margin-top: 16px; font-size: var(--fs-body); line-height: 1.6; color: var(--text-muted); max-width: 50ch; }
.qs-hero .qs-cta-row { margin: 32px 0 28px; }
.qs-pagehead h1 { margin-top: 18px; max-width: 20ch; }
.qs-pagehead__lede { margin-top: 20px; max-width: 56ch; }
.qs-pagehead__extra { margin-top: 28px; }
.qs-motif { position: absolute; right: -140px; top: -80px; opacity: 0.16; pointer-events: none; }
.qs-motif--sm { right: -120px; top: -100px; opacity: 0.1; }

/* Double-duty diagram */
.qs-doubleduty { display: grid; grid-template-columns: 1fr 72px 1.1fr; align-items: center; gap: 0; }
.qs-dd-source { background: var(--surface-raised); border: 1px solid var(--border-mint); border-radius: var(--radius-lg); padding: 26px; box-shadow: var(--glow-mint); }
.qs-dd-source .qs-dd-kicker { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-faint); }
.qs-dd-source .qs-dd-title { font-family: var(--font-display); font-size: var(--fs-h3); font-weight: 700; color: var(--text-strong); margin-top: 6px; line-height: 1.1; }
.qs-dd-source p { margin: 10px 0 0; font-size: 13px; line-height: 1.55; color: var(--text-muted); }
.qs-dd-arrow { position: relative; height: 140px; }
.qs-dd-arrow > .qs-dd-stem { position: absolute; left: 0; top: 50%; width: 36px; height: 1px; background: var(--border-strong); transform: translateY(-50%); }
.qs-dd-arrow::before, .qs-dd-arrow::after { content: ""; position: absolute; left: 36px; width: 36px; height: 1px; background: var(--border-strong); }
.qs-dd-arrow::before { top: 25%; }
.qs-dd-arrow::after { top: 75%; }
.qs-dd-arrow .qs-dd-v1, .qs-dd-arrow .qs-dd-v2 { position: absolute; left: 36px; width: 1px; background: var(--border-strong); }
.qs-dd-arrow .qs-dd-v1 { top: 25%; height: 25%; }
.qs-dd-arrow .qs-dd-v2 { top: 50%; height: 25%; }
.qs-dd-outs { display: flex; flex-direction: column; gap: 18px; }
.qs-dd-out { display: flex; align-items: center; gap: 14px; background: var(--surface-card); border: 1px solid var(--border-hairline); border-radius: var(--radius-lg); padding: 20px 22px; }
.qs-dd-out .qs-dd-pip { width: 10px; height: 10px; border-radius: 3px; background: var(--accent); flex: none; }
.qs-dd-out--muted .qs-dd-pip { background: var(--qs-mint-40); }
.qs-dd-out .qs-dd-out-title { font-family: var(--font-display); font-size: var(--fs-h4); font-weight: 600; color: var(--text-strong); }
.qs-dd-out .qs-dd-out-sub { font-family: var(--font-mono); font-size: 12px; color: var(--text-muted); margin-top: 4px; letter-spacing: 0.02em; }

/* ----- Service rows / ladder / founders / contact panels ---------------- */
.qs-service-row { display: grid; grid-template-columns: auto 1fr; gap: 24px; padding: var(--sp-7) 0; border-bottom: 1px solid var(--border-hairline); }
.qs-service-row__num { font-family: var(--font-mono); font-size: 13px; font-weight: 500; color: var(--accent); border: 1px solid var(--border-mint); background: var(--qs-mint-08); border-radius: var(--radius-md); width: 44px; height: 44px; display: inline-flex; align-items: center; justify-content: center; flex: none; }
.qs-service-row__body { max-width: 60ch; }
.qs-service-row__body .qs-h3 { margin-bottom: 12px; }
.qs-service-row__lead { margin: 0 0 12px; font-size: var(--fs-body); line-height: 1.55; color: var(--text-strong); }
.qs-service-row__text { margin: 0 0 20px; font-size: var(--fs-small); line-height: 1.7; color: var(--text-muted); }
.qs-ladder { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
.qs-ladder__item { background: var(--surface-card); border: 1px solid var(--border-hairline); border-radius: var(--radius-lg); padding: 20px; }
.qs-ladder__n { font-family: var(--font-mono); font-size: 11px; color: var(--text-faint); margin-bottom: 10px; }
.qs-ladder__k { font-family: var(--font-display); font-size: var(--fs-h4); font-weight: 600; color: var(--accent); margin-bottom: 8px; }
.qs-ladder__item p { margin: 0; font-size: 13px; line-height: 1.55; color: var(--text-muted); }
.qs-founder { background: var(--surface-card); border: 1px solid var(--border-hairline); border-radius: var(--radius-xl); padding: 28px; }
.qs-founder__head { display: flex; align-items: center; gap: 16px; margin-bottom: 18px; }
.qs-avatar { width: 52px; height: 52px; border-radius: var(--radius-md); background: var(--surface-inset); border: 1px solid var(--border-mint); display: flex; align-items: center; justify-content: center; font-family: var(--font-mono); font-size: 18px; font-weight: 500; color: var(--accent); flex: none; }
.qs-founder__name { font-family: var(--font-display); font-size: var(--fs-h4); font-weight: 600; color: var(--text-strong); }
.qs-founder__role { font-family: var(--font-mono); font-size: 12px; color: var(--accent); letter-spacing: 0.04em; margin-top: 2px; }
.qs-founder p { margin: 0; font-size: var(--fs-small); line-height: 1.7; color: var(--text-muted); }
.qs-panel { background: var(--surface-card); border: 1px solid var(--border-hairline); border-radius: var(--radius-xl); padding: 28px; display: flex; flex-direction: column; gap: 14px; }
.qs-panel p { margin: 0; font-size: var(--fs-small); line-height: 1.65; color: var(--text-muted); }
.qs-twocol { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.qs-reason { background: var(--surface-card); border: 1px solid var(--border-hairline); border-radius: var(--radius-lg); padding: 24px; }
.qs-reason h3 { margin: 0 0 8px; }
.qs-reason p { margin: 0; font-size: var(--fs-small); line-height: 1.65; color: var(--text-muted); }
.qs-breadcrumb { font-family: var(--font-mono); font-size: 12px; color: var(--text-faint); margin-bottom: 16px; }
.qs-breadcrumb a { color: var(--text-muted); }

/* CTA band */
.qs-cta-band { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 20px; }
.qs-cta-band h2 { max-width: 18ch; }
.qs-cta-band p { font-size: var(--fs-body); line-height: 1.6; color: var(--text-muted); max-width: 48ch; }
.qs-cta-band .qs-cta-row { justify-content: center; margin-top: 8px; }

/* ----- Grids ------------------------------------------------------------ */
.qs-grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; align-items: start; }
.qs-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.qs-grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

/* ----- Responsive ------------------------------------------------------- */
@media (max-width: 1000px) {
  .qs-grid-3, .qs-grid-4, .qs-ladder { grid-template-columns: repeat(2, 1fr); }
  .qs-proof { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 880px) {
  .qs-nav__links, .qs-nav__cta { display: none; }
  .qs-nav__toggle { display: flex; }
}
@media (max-width: 760px) {
  .qs-doubleduty { grid-template-columns: 1fr; gap: 16px; }
  .qs-dd-arrow { display: none; }
}
@media (max-width: 720px) {
  .qs-grid-2, .qs-grid-3, .qs-grid-4, .qs-ladder, .qs-twocol, .qs-proof { grid-template-columns: 1fr; }
  .qs-motif, .qs-motif--sm { opacity: 0.08; }
  .qs-service-row { grid-template-columns: 1fr; gap: 14px; }
}

/* ----- Motion preferences ----------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

/* ----- Accessibility: links inside running text get a visible underline ---- */
/* (not distinguished by color alone, WCAG 1.4.1). Standalone links, buttons,
   nav, footer columns, and card affordances stay clean. */
.qs-prose a, p a, .qs-breadcrumb a, .qs-footer__meta .qs-copy a {
  text-decoration: underline;
  text-decoration-color: var(--qs-border-mint);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
.qs-prose a:hover, p a:hover, .qs-breadcrumb a:hover, .qs-footer__meta .qs-copy a:hover {
  text-decoration-color: var(--accent-bright);
}