:root {
  --ink: #16181d;
  --muted: #565c66;
  --bg: #f6f5f2;
  --card: #ffffff;
  --line: #e2e0da;
  --warn: #c2410c;
  --warn-soft: #fff1e8;
  --night: #0d0f13;
  --on-night: #f3f1ec;
  --on-night-muted: #c9c6bf;
  --radius: 14px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #ecebe7;
    --muted: #a8a59e;
    --bg: #121418;
    --card: #1a1d23;
    --line: #2a2e36;
    --warn: #fb923c;
    --warn-soft: #2a1a10;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-underline-offset: 3px; }
h1, h2, h3 { line-height: 1.2; letter-spacing: -0.01em; margin: 0 0 .5em; }
h2 { font-size: clamp(1.5rem, 1.1rem + 1.6vw, 2.1rem); }
h3 { font-size: 1.1rem; }
p { margin: 0 0 1em; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 32px; } }

/* top bar */
.bar { position: absolute; inset: 0 0 auto; z-index: 2; color: var(--on-night); }
.bar-in { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-top: 18px; padding-bottom: 18px; }
.brand { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; letter-spacing: .01em; }
.pill {
  display: inline-flex; align-items: center; gap: 8px; padding: 5px 12px; border-radius: 999px;
  background: rgba(255, 255, 255, .1); border: 1px solid rgba(255, 255, 255, .22);
  font-size: .85rem; white-space: nowrap;
}
.dot { width: 8px; height: 8px; border-radius: 50%; background: #f97316; box-shadow: 0 0 0 4px rgba(249, 115, 22, .25); }

/* hero */
.hero {
  position: relative;
  color: var(--on-night);
  background:
    linear-gradient(100deg, rgba(10, 11, 14, .94) 0%, rgba(10, 11, 14, .82) 45%, rgba(10, 11, 14, .35) 100%),
    url("/img/padlock.jpg") center 40% / cover no-repeat,
    var(--night);
}
.hero-in { padding-top: 120px; padding-bottom: 72px; max-width: 1120px; }
@media (min-width: 720px) { .hero-in { padding-top: 168px; padding-bottom: 112px; } }
.hero h1 { font-size: clamp(2rem, 1.2rem + 3.6vw, 3.6rem); max-width: 16ch; margin-bottom: .45em; }
.lead { font-size: clamp(1.05rem, .95rem + .5vw, 1.3rem); color: var(--on-night-muted); max-width: 56ch; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; margin-bottom: 1.1em;
  font-size: .8rem; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: #fdba74;
}
.facts { list-style: none; padding: 0; margin: 2em 0 0; display: flex; flex-wrap: wrap; gap: 10px; }
.facts li {
  display: inline-flex; align-items: center; gap: 10px; padding: 10px 16px; border-radius: 10px;
  background: rgba(255, 255, 255, .08); border: 1px solid rgba(255, 255, 255, .16);
  font-size: .95rem; font-weight: 500;
}
.facts svg { color: #fdba74; flex: none; }

/* content blocks */
.block { padding-top: 72px; padding-bottom: 24px; }
.intro { color: var(--muted); max-width: 68ch; font-size: 1.05rem; }
.cards { display: grid; gap: 16px; margin-top: 32px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .cards { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .cards { grid-template-columns: repeat(4, 1fr); } }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 22px;
}
.card p { color: var(--muted); font-size: .97rem; margin: 0; }
.icon {
  display: inline-grid; place-items: center; width: 46px; height: 46px; border-radius: 12px;
  background: var(--warn-soft); color: var(--warn); margin-bottom: 16px;
}

/* split with photo */
.split { padding: 72px 0 24px; }
.split-in { display: grid; gap: 32px; align-items: center; }
@media (min-width: 880px) { .split-in { grid-template-columns: 1.05fr 1fr; gap: 56px; } }
.photo { margin: 0; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); }
.split p { color: var(--muted); }
.split strong { color: var(--ink); }

/* dark band */
.band {
  margin-top: 72px;
  color: var(--on-night);
  background:
    linear-gradient(0deg, rgba(10, 11, 14, .9), rgba(10, 11, 14, .78)),
    url("/img/keyboard.jpg") center / cover no-repeat,
    var(--night);
}
.band-in { padding-top: 80px; padding-bottom: 80px; max-width: 820px; margin-left: 0; }
@media (min-width: 1184px) { .band-in { margin-left: calc((100vw - 1120px) / 2); } }
.band p { color: var(--on-night-muted); font-size: 1.05rem; }
.band .strong { color: var(--on-night); font-weight: 600; border-left: 3px solid #f97316; padding-left: 14px; margin-top: 1.4em; }

/* steps */
.steps { list-style: none; counter-reset: step; padding: 0; margin: 32px 0 0; display: grid; gap: 16px; }
@media (min-width: 880px) { .steps { grid-template-columns: repeat(3, 1fr); } }
.steps li {
  counter-increment: step; position: relative;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 22px 22px;
}
.steps li::before {
  content: counter(step);
  display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 50%;
  background: var(--ink); color: var(--bg); font-weight: 700; margin-bottom: 14px;
}
.steps p { color: var(--muted); font-size: .97rem; margin: 0; }
.note {
  display: flex; gap: 10px; align-items: flex-start; margin-top: 24px; padding: 14px 16px;
  border-radius: 10px; background: var(--warn-soft); color: var(--ink); font-size: .95rem;
}
.note svg { color: var(--warn); flex: none; margin-top: 3px; }

/* english */
.english { margin-top: 56px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--card); }
.english .wrap { padding-top: 40px; padding-bottom: 28px; }
.english h2 { font-size: 1.25rem; }
.english p { color: var(--muted); max-width: 80ch; }
.english strong { color: var(--ink); }

/* sources */
.sources h2 { font-size: 1.25rem; }
.sources ul { padding-left: 1.1em; margin: 0; color: var(--muted); }
.sources li { margin-bottom: .4em; overflow-wrap: anywhere; }
.sources a { color: var(--ink); }

/* footer */
.foot { margin-top: 56px; padding: 32px 0 40px; background: var(--night); color: var(--on-night-muted); font-size: .85rem; }
.foot p { margin: 0 0 .6em; }
.foot a { color: var(--on-night); }
.credits { max-width: 90ch; }