/* ---------------------------------------------------------------------------
   DrvNest landing page — shared stylesheet
   Dark by default (the app's palette), light variant via prefers-color-scheme.
   No web fonts, no external requests: everything here works offline.
   --------------------------------------------------------------------------- */

:root {
  --bg:            #0D1014;
  --bg-elevated:   #10151B;
  --surface:       #171C23;
  --surface-hover: #1C232D;
  --border:        #2A323D;
  --text:          #E8EDF4;
  --muted:         #94A3B4;
  --dim:           #7A8899;
  --accent:        #35D8A4;
  --accent-deep:   #22B98A;
  --on-accent:     #06231A;
  --info:          #4C8DFF;
  --warning:       #F5A623;
  --danger:        #FF5F6B;
  --code-bg:       #0B0E12;
  --shadow:        0 1px 2px rgba(0, 0, 0, .5), 0 8px 24px rgba(0, 0, 0, .35);
  --radius:        14px;
  --radius-sm:     8px;
  --maxw:          1080px;

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

  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg:            #FFFFFF;
    --bg-elevated:   #F7F9FB;
    --surface:       #F2F5F8;
    --surface-hover: #E9EEF4;
    --border:        #D5DDE6;
    --text:          #12171E;
    --muted:         #55606E;
    --dim:           #6B7684;
    --accent:        #12A277;
    --accent-deep:   #0C8560;
    --on-accent:     #FFFFFF;
    --info:          #1E5FD8;
    --warning:       #9A6100;
    --danger:        #C4303C;
    --code-bg:       #EDF1F6;
    --shadow:        0 1px 2px rgba(16, 24, 32, .08), 0 8px 24px rgba(16, 24, 32, .07);

    color-scheme: light;
  }
}

/* --------------------------------------------------------------------------- */

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

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img,
svg {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover,
a:focus-visible {
  text-decoration: underline;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

code,
kbd {
  font-family: var(--font-mono);
  font-size: .88em;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: .1em .38em;
  color: var(--text);
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  overflow-x: auto;
  font-size: 15px;
  line-height: 1.55;
}

pre code {
  background: none;
  border: 0;
  padding: 0;
  font-size: inherit;
}

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 48px 0;
}

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 22px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--on-accent);
  padding: 10px 16px;
  border-radius: 0 0 var(--radius-sm) 0;
  z-index: 20;
}

.skip-link:focus {
  left: 0;
}

/* Available to assistive technology, invisible on screen. */
.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;
}

.sub-heading {
  margin-top: 32px;
}

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

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  min-height: 62px;
  padding-top: 10px;
  padding-bottom: 10px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -.2px;
  color: var(--text);
}

.brand:hover {
  text-decoration: none;
}

.brand img {
  width: 30px;
  height: 30px;
  display: block;
}

.brand .mark-nest {
  color: var(--accent);
}

.site-nav {
  margin-left: auto;
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 20px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 15px;
}

.site-nav a {
  color: var(--muted);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--text);
}

.lang-switch {
  color: var(--text) !important;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 12px;
  background: var(--surface);
}

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

.hero {
  padding: 64px 0 8px;
}

.hero-mark {
  width: 84px;
  height: 84px;
  display: block;
  margin-bottom: 22px;
}

.hero h1 {
  font-size: clamp(32px, 5.2vw, 50px);
  line-height: 1.12;
  letter-spacing: -1px;
  margin: 0 0 18px;
  max-width: 20ch;
}

.hero .lede {
  font-size: clamp(17px, 2.2vw, 20px);
  color: var(--muted);
  max-width: 62ch;
  margin: 0 0 14px;
}

.hero .lede strong {
  color: var(--text);
  font-weight: 600;
}

.meta-line {
  color: var(--dim);
  font-size: 15px;
  margin: 0 0 30px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border-radius: var(--radius-sm);
  padding: 14px 26px;
  font-size: 17px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: background-color .15s ease, border-color .15s ease;
}

.btn:hover,
.btn:focus-visible {
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: var(--on-accent);
  box-shadow: var(--shadow);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--accent-deep);
}

.btn-secondary {
  background: var(--surface);
  border-color: var(--border);
  color: var(--text);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  background: var(--surface-hover);
}

.cta-note {
  font-size: 14px;
  color: var(--dim);
  margin: 0 0 8px;
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.pill {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  border-radius: 999px;
  padding: 5px 15px;
  font-size: 14px;
  white-space: nowrap;
}

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

main section {
  padding: 46px 0 6px;
  scroll-margin-top: 80px;
}

h2 {
  font-size: clamp(24px, 3.4vw, 32px);
  letter-spacing: -.5px;
  line-height: 1.25;
  margin: 0 0 8px;
}

h3 {
  font-size: 19px;
  line-height: 1.35;
  margin: 0 0 8px;
}

.section-intro {
  color: var(--muted);
  max-width: 68ch;
  margin: 0 0 26px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(268px, 1fr));
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
}

.card h3 {
  color: var(--text);
}

.card p {
  color: var(--muted);
  margin: 0;
  font-size: 15.5px;
  line-height: 1.6;
}

.card p + p {
  margin-top: 10px;
}

/* --- walkthrough ----------------------------------------------------------- */

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 22px;
}

.step-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px 26px;
}

.step-block ol {
  margin: 0;
  padding-left: 1.25em;
  color: var(--muted);
}

.step-block li {
  margin-bottom: 10px;
}

.step-block li strong {
  color: var(--text);
  font-weight: 600;
}

.callout {
  border-left: 3px solid var(--accent);
  background: var(--surface);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 14px 18px;
  color: var(--muted);
  margin: 24px 0 0;
  font-size: 15.5px;
}

.callout.warn {
  border-left-color: var(--warning);
}

.callout strong {
  color: var(--text);
}

/* --- comparison table ------------------------------------------------------ */

.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

table {
  border-collapse: collapse;
  width: 100%;
  min-width: 540px;
  font-size: 15.5px;
}

th,
td {
  text-align: left;
  padding: 13px 18px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

thead th {
  color: var(--text);
  font-weight: 600;
  white-space: nowrap;
}

tbody td {
  color: var(--muted);
}

tbody td:first-child {
  color: var(--text);
  font-weight: 500;
}

tbody tr:last-child th,
tbody tr:last-child td {
  border-bottom: 0;
}

.yes { color: var(--accent); font-weight: 600; }
.no  { color: var(--danger); font-weight: 600; }

/* --- FAQ ------------------------------------------------------------------- */

.faq {
  display: grid;
  gap: 14px;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
}

.faq-item h3 {
  margin: 0 0 8px;
}

.faq-item p {
  color: var(--muted);
  margin: 0;
  font-size: 15.5px;
}

.faq-item p + p {
  margin-top: 10px;
}

.faq-item ol,
.faq-item ul {
  color: var(--muted);
  font-size: 15.5px;
  margin: 10px 0 0;
  padding-left: 1.25em;
}

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

.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 64px;
  padding: 34px 0 46px;
  color: var(--muted);
  font-size: 15px;
}

.site-footer ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
}

.site-footer p {
  margin: 0 0 8px;
  max-width: 72ch;
}

.keywords {
  color: var(--dim);
  font-size: 13px;
  line-height: 1.6;
  margin-top: 20px;
}

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

@media (max-width: 640px) {
  body { font-size: 16px; }

  .hero { padding-top: 40px; }

  .site-header { position: static; }

  .site-nav { margin-left: 0; width: 100%; }

  .btn { width: 100%; justify-content: center; }

  .cta-row { gap: 10px; }
}