/* Adaptive IDS website. Light by default; dark follows the visitor's system setting. */
:root {
  color-scheme: light dark;
  --page: #f9f9f7;
  --surface: #ffffff;
  --surface-2: #f3f2ee;
  --tint: #e3eefc;
  --ink: #0b0b0b;
  --ink-2: #3a3a37;
  --muted: #6f6d68;
  --border: rgba(11, 11, 11, 0.12);
  --border-strong: rgba(11, 11, 11, 0.22);
  --primary: #1c5cab;
  --primary-hover: #184f95;
  --primary-ink: #1c5cab;
  --accent: #eb6834;
  --good: #0a7d0a;
  --warn-bg: #fff4d6;
  --warn-border: #e0a100;
  --warn-ink: #5c4400;
  --error: #b42a2a;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.05), 0 10px 30px rgba(0, 0, 0, 0.06);
  --radius: 12px;
  --max: 1160px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --page: #0d0d0d;
    --surface: #161615;
    --surface-2: #1e1e1c;
    --tint: #142235;
    --ink: #f0efec;
    --ink-2: #d2d1cb;
    --muted: #a19f97;
    --border: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(255, 255, 255, 0.2);
    --primary: #2f73c9;
    --primary-hover: #3987e5;
    --primary-ink: #86b6ef;
    --accent: #f07a4a;
    --good: #3fbf55;
    --warn-bg: #2e2510;
    --warn-border: #c98500;
    --warn-ink: #f4d58a;
    --error: #f08a8a;
    --shadow: none;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; background: var(--page); color: var(--ink); font: 17px/1.6 var(--font); }
img, video { max-width: 100%; height: auto; display: block; }
a { color: var(--primary-ink); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--primary-ink); outline-offset: 3px; border-radius: 4px; }
h1, h2, h3 { line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 0.5em; }
h1 { font-size: clamp(2.1rem, 4.6vw, 3.6rem); font-weight: 750; }
h2 { font-size: clamp(1.7rem, 3.2vw, 2.5rem); font-weight: 720; }
h3 { font-size: 1.2rem; font-weight: 680; letter-spacing: -0.01em; }
p { margin: 0 0 1em; }
.wrap { width: min(var(--max), calc(100% - 40px)); margin-inline: auto; }
.skip { position: absolute; left: -9999px; top: 8px; background: var(--surface); padding: 8px 14px; border-radius: 8px; z-index: 100; }
.skip:focus { left: 12px; }
.eyebrow { font-size: 0.85rem; font-weight: 650; letter-spacing: 0.08em; text-transform: uppercase; color: var(--primary-ink); margin-bottom: 12px; }
.lead { font-size: clamp(1.08rem, 1.6vw, 1.25rem); color: var(--ink-2); max-width: 46em; }
.muted { color: var(--muted); }
.small { font-size: 0.9rem; }

/* header */
.site-header { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--page) 86%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.site-header .wrap { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 720; font-size: 1.1rem; color: var(--ink); text-decoration: none; }
.brand svg { width: 30px; height: 30px; flex: none; }
.nav { display: flex; gap: 22px; margin-left: auto; align-items: center; }
.nav a { color: var(--ink-2); text-decoration: none; font-size: 0.95rem; }
.nav a:hover { color: var(--ink); }
.nav .btn { color: #fff; }
.menu-btn { display: none; margin-left: auto; background: none; border: 1px solid var(--border-strong); border-radius: 8px; padding: 6px 10px; color: var(--ink); font: inherit; }
@media (max-width: 860px) {
  .menu-btn { display: inline-flex; }
  .nav { display: none; position: absolute; top: 64px; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; background: var(--surface); border-bottom: 1px solid var(--border); padding: 8px 20px 16px; }
  .nav.open { display: flex; }
  .nav a { padding: 10px 0; border-bottom: 1px solid var(--border); }
  .nav .btn { margin-top: 12px; text-align: center; border-bottom: 0; }
}

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 20px; border-radius: 10px; background: var(--primary); color: #fff; font-weight: 650; text-decoration: none; border: 1px solid transparent; cursor: pointer; font: inherit; font-weight: 650; }
.btn:hover { background: var(--primary-hover); }
.btn.secondary { background: transparent; color: var(--ink); border-color: var(--border-strong); }
.btn.secondary:hover { background: var(--surface-2); }
.btn[disabled] { opacity: 0.6; cursor: progress; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

/* sections */
section { padding: clamp(64px, 9vw, 112px) 0; }
section + section { border-top: 1px solid var(--border); }
.section-head { max-width: 760px; margin-bottom: 44px; }

/* hero */
.hero { padding-top: clamp(48px, 7vw, 88px); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 48px; }
.hero h1 { max-width: 15em; }
.trust { display: flex; flex-wrap: wrap; gap: 10px 22px; margin-top: 26px; padding: 0; list-style: none; color: var(--ink-2); font-size: 0.95rem; }
.trust li { display: inline-flex; align-items: center; gap: 8px; }
.trust li::before { content: ""; width: 8px; height: 8px; border-radius: 2px; background: var(--accent); }
.shot { border-radius: var(--radius); border: 1px solid var(--border); box-shadow: var(--shadow); overflow: hidden; background: var(--surface); }
.hero .shot { margin-top: 8px; }
figure { margin: 0; }
figcaption { font-size: 0.88rem; color: var(--muted); margin-top: 10px; }

/* video */
.video-frame { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); box-shadow: var(--shadow); background: #000; aspect-ratio: 16 / 9; }
.video-frame video { width: 100%; height: 100%; }
.note { display: block; background: var(--warn-bg); border: 1px solid var(--warn-border); color: var(--warn-ink); border-radius: 10px; padding: 12px 16px; font-size: 0.92rem; margin-top: 16px; }

/* cards */
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; }
@media (max-width: 900px) { .grid-3, .grid-2 { grid-template-columns: minmax(0, 1fr); } }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; }
.card h3 { margin-bottom: 8px; }
.card p:last-child { margin-bottom: 0; }
.card .icon { width: 40px; height: 40px; border-radius: 10px; background: var(--tint); display: grid; place-items: center; margin-bottom: 16px; color: var(--primary-ink); }
.card .icon svg { width: 22px; height: 22px; }

/* features */
.feature { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 48px; align-items: center; padding: 36px 0; }
.feature + .feature { border-top: 1px dashed var(--border); }
.feature.flip > :first-child { order: 2; }
@media (max-width: 900px) { .feature, .feature.flip { grid-template-columns: minmax(0, 1fr); gap: 24px; } .feature.flip > :first-child { order: 0; } }
.feature ul { padding-left: 1.1em; color: var(--ink-2); margin: 0; }
.feature li { margin: 6px 0; }

/* flow diagram */
.flow { width: 100%; height: auto; }
.flow text { font-family: var(--font); }

/* evidence */
.stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; margin-bottom: 36px; }
@media (max-width: 900px) { .stats { grid-template-columns: minmax(0, 1fr); } }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.stat .num { font-size: 2.4rem; font-weight: 760; letter-spacing: -0.03em; line-height: 1; margin-bottom: 10px; }
.stat .src { display: block; margin-top: 10px; font-size: 0.85rem; color: var(--muted); }
.limits { background: var(--surface-2); border-radius: var(--radius); padding: 22px 26px; margin-top: 28px; }
.limits h3 { font-size: 1.05rem; }
.limits ul { margin: 0; padding-left: 1.1em; color: var(--ink-2); }

/* who */
.who-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }

/* evaluation */
.steps { counter-reset: s; list-style: none; padding: 0; margin: 0 0 28px; display: grid; gap: 14px; }
.steps li { counter-increment: s; display: grid; grid-template-columns: 36px minmax(0, 1fr); gap: 14px; align-items: start; }
.steps li::before { content: counter(s); width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; background: var(--tint); color: var(--primary-ink); font-weight: 700; }
.eval-grid { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 48px; align-items: start; }
@media (max-width: 900px) { .eval-grid { grid-template-columns: minmax(0, 1fr); } }

/* form */
form.card { padding: 30px; }
.field { display: grid; gap: 6px; margin-bottom: 16px; }
.field label, .field legend { font-weight: 600; font-size: 0.95rem; }
.field .hint { font-size: 0.85rem; color: var(--muted); }
.field input, .field select, .field textarea { font: inherit; font-size: 1rem; color: var(--ink); background: var(--page); border: 1px solid var(--border-strong); border-radius: 8px; padding: 10px 12px; width: 100%; }
.field textarea { min-height: 110px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: 3px solid color-mix(in srgb, var(--primary) 40%, transparent); border-color: var(--primary); }
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 560px) { .row-2 { grid-template-columns: 1fr; } }
.check { display: grid; grid-template-columns: 22px 1fr; gap: 10px; align-items: start; font-size: 0.92rem; color: var(--ink-2); margin: 6px 0 20px; }
.check input { width: 18px; height: 18px; margin-top: 3px; }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.form-status { margin-top: 14px; font-size: 0.95rem; min-height: 1.5em; }
.form-status.ok { color: var(--good); font-weight: 600; }
.form-status.err { color: var(--error); font-weight: 600; }

/* faq */
.faq { max-width: 820px; }
.faq details { border-bottom: 1px solid var(--border); padding: 18px 0; }
.faq summary { cursor: pointer; font-weight: 650; font-size: 1.05rem; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--muted); font-weight: 400; font-size: 1.4rem; line-height: 1; }
.faq details[open] summary::after { content: "\2212"; }
.faq details p { margin: 12px 0 0; color: var(--ink-2); }

/* founder */
.founder { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; max-width: 820px; }

/* footer */
.site-footer { border-top: 1px solid var(--border); padding: 40px 0 56px; font-size: 0.92rem; color: var(--muted); }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 16px 32px; justify-content: space-between; align-items: center; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 18px; }
.site-footer a { color: var(--ink-2); }

/* prose pages */
.prose { max-width: 760px; padding: 56px 0 80px; }
.prose h1 { font-size: clamp(2rem, 4vw, 2.8rem); }
.prose h2 { font-size: 1.45rem; margin-top: 1.8em; }
.prose ul { padding-left: 1.2em; }
.prose table { border-collapse: collapse; width: 100%; font-size: 0.95rem; margin: 1em 0 1.4em; }
.prose th, .prose td { text-align: left; border-bottom: 1px solid var(--border); padding: 10px 8px; vertical-align: top; }
[hidden] { display: none !important; }
.actions.tight { margin-top: 8px; }

/* inline flow diagram */
.f-box { fill: var(--surface); stroke: var(--border-strong); stroke-width: 1.5; }
.f-accent { fill: var(--tint); stroke: var(--primary); stroke-width: 2; }
.f-name { font-size: 17px; font-weight: 650; text-anchor: middle; fill: var(--ink); }
.f-sub { font-size: 14px; text-anchor: middle; fill: var(--muted); }
.f-lines path, .f-line { fill: none; stroke: var(--muted); stroke-width: 1.5; }
.f-arrow { fill: var(--muted); }
section[id] { scroll-margin-top: 64px; }