/* ArDesk site — arsoft brand: navy #0F3F71, teal #02A7AC. No gradients. */
:root {
  --bg: #F3F6FA; --surface: #FFFFFF; --card: #FFFFFF; --line: #E1E7EF;
  --fg: #0F2A47; --fg2: #3A5573; --muted: #6A819B; --heading: #0F3F71;
  --navy: #0F3F71; --teal: #02A7AC; --teal-hover: #0CB8BC; --teal-soft: #DDF3F4;
  --on-navy-muted: #A9C1DD; --input: #FFFFFF; --input-line: #CDD7E3;
  --shadow: 0 1px 3px rgba(15, 63, 113, .08), 0 8px 24px rgba(15, 63, 113, .06);
  --radius: 14px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root[data-theme="auto"] {
    --bg: #0A1626; --surface: #0E1D31; --card: #112339; --line: #1E3550;
    --fg: #E4ECF5; --fg2: #B6C6D8; --muted: #8299B3; --heading: #EAF2FB;
    --teal-soft: #0B3A42; --input: #0B1A2C; --input-line: #26405E;
    --shadow: 0 1px 3px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0A1626; --surface: #0E1D31; --card: #112339; --line: #1E3550;
  --fg: #E4ECF5; --fg2: #B6C6D8; --muted: #8299B3; --heading: #EAF2FB;
  --teal-soft: #0B3A42; --input: #0B1A2C; --input-line: #26405E;
  --shadow: 0 1px 3px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.6 Inter, "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--teal); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { color: var(--heading); line-height: 1.2; margin: 0 0 .5em; }
h1 { font-size: clamp(2rem, 4.2vw, 3.1rem); letter-spacing: -.02em; }
h2 { font-size: clamp(1.5rem, 2.6vw, 2rem); letter-spacing: -.01em; }
h3 { font-size: 1.05rem; }
p { margin: 0 0 1em; color: var(--fg2); }
.wrap { width: min(1140px, 100% - 40px); margin-inline: auto; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* top bar */
.topbar { position: sticky; top: 0; z-index: 10; background: var(--surface); border-bottom: 1px solid var(--line); }
.topbar-inner { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--heading); text-decoration: none !important; }
.brand-logo { display: block; }
.brand-sep { width: 1px; height: 24px; background: var(--line); margin: 0 4px; }
.brand-name { font-weight: 700; font-size: 1.1rem; }
.logo-dark { display: none; }
:root[data-theme="dark"] .logo-light { display: none; }
:root[data-theme="dark"] .logo-dark { display: block; }
@media (prefers-color-scheme: dark) {
  :root[data-theme="auto"] .logo-light { display: none; }
  :root[data-theme="auto"] .logo-dark { display: block; }
}
.nav { display: flex; gap: 22px; margin-left: auto; }
.nav a { color: var(--fg2); font-weight: 500; font-size: .95rem; }
.nav a:hover { color: var(--teal); text-decoration: none; }
.controls { display: flex; align-items: center; gap: 8px; }
.select { display: flex; align-items: center; gap: 6px; border: 1px solid var(--line); border-radius: 10px; padding: 0 10px; height: 38px; color: var(--fg2); }
.select svg { width: 17px; height: 17px; }
.select select { background: transparent; border: 0; color: var(--fg); font: inherit; font-size: .9rem; cursor: pointer; outline: none; }
.select select option { color: #0F2A47; }
.icon-btn { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--line); background: transparent; color: var(--fg2); cursor: pointer; }
.icon-btn:hover { color: var(--teal); border-color: var(--teal); }
.icon-btn svg { width: 18px; height: 18px; }
.i-sun { display: none; }
:root[data-theme="dark"] .i-sun { display: block; }
:root[data-theme="dark"] .i-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root[data-theme="auto"] .i-sun { display: block; }
  :root[data-theme="auto"] .i-moon { display: none; }
}

/* hero */
.hero { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; padding: 72px 0 64px; }
.lead { font-size: 1.15rem; max-width: 34em; }
.lead.small { font-size: 1.02rem; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 12px; }
.btn { display: inline-flex; align-items: center; gap: 10px; height: 52px; padding: 0 24px; border-radius: 12px; font-weight: 600; text-decoration: none !important; transition: background .15s, border-color .15s; }
.btn-primary { background: var(--teal); color: #fff; }
.btn-primary:hover { background: var(--teal-hover); }
.btn-secondary { border: 1px solid var(--input-line); color: var(--heading); background: var(--card); }
.btn-secondary:hover { border-color: var(--teal); }
.os-icon svg { width: 20px; height: 20px; display: block; stroke: none; fill: currentColor; }
.meta { font-size: .9rem; color: var(--muted); margin: 0; }
.mobile-note { margin-top: 8px; }

/* app mock */
.mock { background: var(--card); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); overflow: hidden; font-size: 13px; }
.mock-title { display: flex; align-items: center; gap: 8px; padding: 11px 14px; border-bottom: 1px solid var(--line); background: var(--surface); color: var(--heading); }
.mock-title span { color: var(--muted); font-size: 12px; }
.mock-title i { width: 9px; height: 9px; border-radius: 50%; background: var(--line); margin-left: auto; }
.mock-title i + i { margin-left: 6px; }
.mock-body { display: grid; grid-template-columns: 1fr 1.25fr; gap: 12px; padding: 14px; background: var(--bg); }
.mock-card { position: relative; overflow: hidden; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px; display: flex; flex-direction: column; gap: 4px; min-height: 230px; }
.mock-card small { font-size: 10px; letter-spacing: .08em; font-weight: 600; color: var(--muted); margin-bottom: 8px; text-transform: uppercase; }
.mock-card.navy { background: var(--navy); border-color: var(--navy); color: #fff; }
.mock-card.navy small, .mock-card.navy .mock-label { color: var(--on-navy-muted); }
.mock-label { font-size: 11px; margin-top: 6px; }
.mock-id { font-size: 22px; letter-spacing: .02em; }
.mock-pw { font-size: 17px; letter-spacing: .1em; }
.mock-mark { position: absolute; right: -36px; bottom: -28px; width: 140px; height: 140px; fill: var(--teal); stroke: none; opacity: .14; }
.mock-row { display: flex; gap: 8px; margin-bottom: 14px; }
.mock-input { flex: 1; border: 1px solid var(--input-line); border-radius: 8px; padding: 8px 10px; font-weight: 600; color: var(--fg); background: var(--input); letter-spacing: .04em; }
.mock-btn { background: var(--teal); color: #fff; border-radius: 8px; padding: 8px 14px; font-weight: 600; }
.mock-recent { display: flex; align-items: center; gap: 10px; border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; margin-top: 8px; }
.mock-recent span { width: 26px; height: 26px; border-radius: 7px; background: var(--teal-soft); }
.mock-recent b { color: var(--fg); font-size: 12.5px; }

/* sections */
.section { padding: 72px 0; }
.section.alt { background: var(--surface); border-block: 1px solid var(--line); }
.grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 28px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.feat { padding: 22px; }
.feat svg { color: var(--teal); width: 26px; height: 26px; margin-bottom: 12px; }
.feat p { font-size: .94rem; margin: 0; }
.steps { list-style: none; padding: 0; margin: 28px 0 20px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.steps li { padding: 24px; }
.steps p { margin: 0; font-size: .95rem; }
.num { display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; background: var(--navy); color: #fff; font-weight: 700; margin-bottom: 14px; }
.tips { padding: 22px 26px; }
.tips ul { margin: 0; padding-left: 20px; color: var(--fg2); }
.tips li { margin: 6px 0; }

.downloads { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 26px; }
.dl { display: grid; grid-template-columns: auto 1fr auto; gap: 16px; align-items: center; padding: 20px 22px; }
.dl.rec { border-color: var(--teal); box-shadow: 0 0 0 1px var(--teal), var(--shadow); }
.dl-icon { width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; background: var(--teal-soft); color: var(--heading); }
.dl-icon svg { width: 24px; height: 24px; fill: currentColor; stroke: none; }
.dl h3 { margin: 0 0 2px; }
.dl p { margin: 0; font-size: .88rem; color: var(--muted); }
.dl .badge { display: inline-block; font-size: .72rem; font-weight: 700; color: var(--teal); background: var(--teal-soft); border-radius: 6px; padding: 1px 7px; margin-left: 6px; vertical-align: 2px; }
.dl .btn { height: 42px; padding: 0 18px; }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.checks { list-style: none; padding: 0; margin: 18px 0 0; }
.checks li { position: relative; padding-left: 32px; margin: 12px 0; color: var(--fg2); }
.checks li::before { content: ""; position: absolute; left: 0; top: 4px; width: 20px; height: 20px; border-radius: 6px; background: var(--teal-soft); }
.checks li::after { content: ""; position: absolute; left: 7px; top: 8px; width: 5px; height: 9px; border: solid var(--teal); border-width: 0 2px 2px 0; transform: rotate(45deg); }
details { padding: 0 20px; margin: 12px 0; }
summary { cursor: pointer; padding: 16px 0; font-weight: 600; color: var(--heading); list-style-position: outside; }
details p { margin: 0 0 16px; font-size: .95rem; }

.footer { padding: 26px 0; color: var(--muted); font-size: .9rem; }
.footer-inner { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; padding-top: 48px; }
  .grid { grid-template-columns: repeat(2, 1fr); }
  .steps, .downloads, .two-col { grid-template-columns: 1fr; }
  .nav { display: none; }
  .controls { margin-left: auto; }
}
@media (max-width: 560px) {
  .grid { grid-template-columns: 1fr; }
  .mock-body { grid-template-columns: 1fr; }
  .brand-name, .brand-sep, .brand > img:not(.brand-logo) { display: none; }
  .dl { grid-template-columns: auto 1fr; }
  .dl .btn { grid-column: 1 / -1; justify-content: center; }
}