/* The 24x7 page: a night-shift diary. Night blue, amber for the human hours, teal for the agents. */
:root {
  --night: #0b1220;
  --night-2: #111a2e;
  --night-3: #18233b;
  --paper: #f3efe6;
  --paper-2: #e9e3d5;
  --ink: #101828;
  --ink-soft: #4a5468;
  --on-night: #e6ecf5;
  --on-night-soft: #9aa8c0;
  --amber: #f5b041;
  --teal: #2ec4b6;
  --line-dark: rgba(230, 236, 245, 0.12);
  --line-light: rgba(16, 24, 40, 0.12);
  --danger: #e5484d;
  --display: 'Archivo', 'Arial Narrow', system-ui, sans-serif;
  --body: 'IBM Plex Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 17px/1.6 var(--body); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
a { color: inherit; }
h1, h2, h3 { font-family: var(--display); font-stretch: 110%; line-height: 1.05; letter-spacing: -0.01em; margin: 0; text-wrap: balance; }
p { margin: 0; }
.wrap { width: min(1120px, 100% - 32px); margin-inline: auto; }
.narrow { width: min(760px, 100% - 32px); }
.center { text-align: center; }
.kicker { font: 500 13px var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--amber); margin-bottom: 14px; }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 14px 24px; border-radius: 6px; border: 0; cursor: pointer; text-decoration: none;
  font: 700 15px var(--display); font-stretch: 105%; letter-spacing: .01em; color: var(--night); background: var(--amber); transition: transform .15s, box-shadow .2s; }
.btn:hover { transform: translateY(-1px); box-shadow: 0 10px 30px -10px rgba(245, 176, 65, .7); }
.btn:focus-visible, input:focus-visible, a:focus-visible { outline: 2px solid var(--teal); outline-offset: 3px; }
.btn-sm { padding: 9px 16px; font-size: 14px; }
.btn-ghost { background: transparent; color: inherit; border: 1px solid currentColor; box-shadow: none; }
.btn-ghost:hover { box-shadow: none; background: rgba(127, 127, 127, .08); }
.btn-block { width: 100%; }
.btn[disabled] { opacity: .6; cursor: progress; transform: none; }

/* top bar */
.top { position: sticky; top: 0; z-index: 10; background: rgba(11, 18, 32, .86); backdrop-filter: blur(12px); color: var(--on-night); border-bottom: 1px solid var(--line-dark); }
.top-in { height: 60px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.mark { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font: 800 16px var(--display); font-stretch: 112%; }
.moon { width: 18px; height: 18px; border-radius: 50%; box-shadow: inset -6px -2px 0 0 var(--amber); transform: rotate(-20deg); }
.top nav { display: flex; gap: 26px; font-size: 14px; color: var(--on-night-soft); }
.top nav a { text-decoration: none; }
.top nav a:hover { color: var(--on-night); }
.top-actions { display: flex; align-items: center; gap: 12px; }
.lang { font: 600 13px var(--mono); color: var(--on-night-soft); text-decoration: none; padding: 6px 9px; border: 1px solid var(--line-dark); border-radius: 5px; }
.lang:hover { color: var(--on-night); border-color: var(--on-night-soft); }

/* hero */
.hero { background: radial-gradient(90% 70% at 85% 0%, rgba(46, 196, 182, .16), transparent 60%), radial-gradient(70% 60% at 0% 100%, rgba(245, 176, 65, .12), transparent 60%), var(--night); color: var(--on-night); padding: 88px 0 72px; }
.hero h1 { font-size: clamp(48px, 9vw, 112px); font-weight: 900; font-stretch: 118%; }
.hero h1 span { color: var(--amber); }
.lead { font-size: clamp(17px, 2vw, 21px); color: var(--on-night-soft); max-width: 62ch; margin-top: 26px; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.clock { margin: 64px 0 0; }
.clock-bar { display: grid; grid-template-columns: repeat(24, 1fr); gap: 4px; }
.clock-bar i { height: 46px; border-radius: 3px; background: color-mix(in srgb, var(--teal) 55%, transparent); position: relative; transform-origin: bottom; animation: rise .6s ease both; }
.clock-bar i.me { background: var(--amber); }
.clock-bar i.now::after { content: ''; position: absolute; inset: -4px; border: 2px solid var(--on-night); border-radius: 5px; animation: pulse 1.6s infinite; }
.clock-bar b { font: 500 11px var(--mono); color: var(--on-night-soft); text-align: center; margin-top: 6px; }
.clock figcaption { display: flex; flex-wrap: wrap; gap: 10px 26px; margin-top: 18px; font: 13px var(--mono); color: var(--on-night-soft); }
.clock figcaption i { display: inline-block; width: 11px; height: 11px; border-radius: 2px; margin-right: 8px; vertical-align: -1px; }
.sw-agents { background: color-mix(in srgb, var(--teal) 55%, transparent); }
.sw-me { background: var(--amber); }

/* numbers */
.numbers { background: var(--night-2); color: var(--on-night); border-top: 1px solid var(--line-dark); }
.nums { display: grid; grid-template-columns: repeat(4, 1fr); }
.nums div { padding: 30px 22px; display: grid; gap: 6px; border-left: 1px solid var(--line-dark); }
.nums div:first-child { border-left: 0; padding-left: 0; }
.nums b { font: 900 clamp(34px, 4vw, 52px)/1 var(--display); font-stretch: 115%; color: var(--teal); }
.nums span { font-size: 14px; color: var(--on-night-soft); }

/* sections */
.section { padding: 100px 0; }
.section h2 { font-size: clamp(32px, 4.6vw, 54px); font-weight: 800; }
.body { font-size: 18px; color: var(--ink-soft); margin-top: 18px; max-width: 64ch; }
.body.center { margin-inline: auto; }
.section-dark { background: var(--night); color: var(--on-night); }
.section-dark .body { color: var(--on-night-soft); }

/* story */
.timeline { list-style: none; padding: 0; margin: 48px 0 0; border-left: 2px solid var(--line-light); }
.timeline li { display: grid; grid-template-columns: 90px 1fr; gap: 18px; padding: 0 0 34px 26px; position: relative; }
.timeline li::before { content: ''; position: absolute; left: -8px; top: 6px; width: 14px; height: 14px; border-radius: 50%; background: var(--teal); box-shadow: 0 0 0 4px var(--paper); }
.timeline li.night::before { background: var(--night); box-shadow: 0 0 0 4px var(--paper), 0 0 0 6px var(--amber); }
.timeline .when { font: 500 13px/1.9 var(--mono); color: var(--ink-soft); }
.timeline h3 { font-size: 22px; margin-bottom: 6px; }
.timeline p { color: var(--ink-soft); }

/* a day */
.day { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 44px; }
.day > div { padding: 22px; border-radius: 8px; display: grid; gap: 8px; align-content: start; }
.d-night { background: var(--night-3); border: 1px solid var(--line-dark); }
.d-me { background: color-mix(in srgb, var(--amber) 16%, var(--night)); border: 1px solid color-mix(in srgb, var(--amber) 40%, transparent); }
.day .t { font: 500 12px var(--mono); text-transform: uppercase; letter-spacing: .1em; color: var(--on-night-soft); }
.d-me .t { color: var(--amber); }
.day h3 { font-size: 20px; }
.day p { color: var(--on-night-soft); font-size: 15px; }
.media-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 56px; }
.frame { margin: 0; border-radius: 10px; overflow: hidden; border: 1px solid var(--line-dark); background: #0b0b12; box-shadow: 0 40px 80px -40px rgba(0, 0, 0, .9); }
.frame-bar { display: flex; align-items: center; gap: 6px; padding: 9px 12px; border-bottom: 1px solid var(--line-dark); font: 12px var(--mono); color: var(--on-night-soft); }
.frame-bar i { width: 9px; height: 9px; border-radius: 50%; background: #2a3550; }
.frame-bar span { margin-left: 8px; }
.frame video { display: block; width: 100%; aspect-ratio: 14 / 9; object-fit: cover; object-position: top left; }
.note { margin-top: 14px; font: 13px var(--mono); color: var(--on-night-soft); }

/* chapters */
.lessons { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 48px; }
.lessons article { background: #fff; border: 1px solid var(--line-light); border-radius: 8px; padding: 26px; display: grid; gap: 10px; align-content: start; transition: transform .2s, box-shadow .2s; }
.lessons article:hover { transform: translateY(-3px); box-shadow: 0 18px 40px -24px rgba(16, 24, 40, .35); }
.lessons .n { font: 900 30px var(--display); font-stretch: 115%; color: var(--amber); }
.lessons h3 { font-size: 21px; }
.lessons p { color: var(--ink-soft); font-size: 15px; }
.lesson-link { text-decoration: none; display: grid; }
.lessons article.open { border-color: color-mix(in srgb, var(--amber) 55%, transparent); box-shadow: 0 0 0 1px color-mix(in srgb, var(--amber) 30%, transparent); }
.lesson-link:hover article { transform: translateY(-3px); box-shadow: 0 18px 40px -24px rgba(16, 24, 40, .45); }
.lesson-link:focus-visible { outline: 2px solid var(--teal); outline-offset: 3px; border-radius: 8px; }
.lessons .read { font: 700 14px var(--display); font-stretch: 105%; color: var(--ink); margin-top: 2px; }
.soon.done-tag { color: #b07206; border-color: color-mix(in srgb, var(--amber) 60%, transparent); }
.soon { justify-self: start; font: 500 11px var(--mono); text-transform: uppercase; letter-spacing: .1em; color: var(--teal); border: 1px solid color-mix(in srgb, var(--teal) 50%, transparent); padding: 4px 8px; border-radius: 4px; margin-top: 6px; }

/* newsletter */
.news { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.form { display: grid; gap: 14px; padding: 28px; border-radius: 10px; background: var(--night-2); border: 1px solid var(--line-dark); }
.form[hidden], .done[hidden] { display: none; }
.field { display: grid; gap: 6px; font-size: 14px; font-weight: 600; }
.field em { font-weight: 400; color: var(--on-night-soft); font-style: normal; }
.field input { width: 100%; padding: 13px 14px; border-radius: 6px; border: 1px solid var(--line-dark); background: var(--night); color: var(--on-night); font: 16px var(--body); }
.field input::placeholder { color: #5d6a85; }
.field input:focus { outline: none; border-color: var(--amber); box-shadow: 0 0 0 3px rgba(245, 176, 65, .2); }
.field input[aria-invalid="true"] { border-color: var(--danger); }
.err { color: #ff8a8e; font-size: 13px; font-weight: 400; }
.err:empty { display: none; }
.consent { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; color: var(--on-night-soft); cursor: pointer; }
.consent input { width: 18px; height: 18px; margin: 2px 0 0; accent-color: var(--amber); flex: none; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-msg { font-size: 14px; color: #ff8a8e; text-align: center; }
.form-msg:empty { display: none; }
.spinner { width: 15px; height: 15px; border-radius: 50%; border: 2px solid rgba(11, 18, 32, .3); border-top-color: var(--night); animation: spin .7s linear infinite; }
.done { text-align: center; padding: 40px 28px; border-radius: 10px; background: var(--night-2); border: 1px solid color-mix(in srgb, var(--teal) 50%, transparent); display: grid; gap: 12px; justify-items: center; }
.done-icon { width: 58px; height: 58px; border-radius: 50%; display: grid; place-items: center; font: 800 26px var(--display); color: var(--night); background: var(--teal); }
.done h3 { font-size: 26px; }
.done p { color: var(--on-night-soft); }

.more { background: var(--paper-2); }
.more .body { margin: 16px auto 28px; }

.foot { background: var(--night); color: var(--on-night-soft); padding: 26px 0; font-size: 14px; }
.foot-in { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* a chapter page */
.post-head { background: radial-gradient(80% 90% at 90% 0%, rgba(46, 196, 182, .14), transparent 60%), var(--night); color: var(--on-night); padding: 72px 0 56px; }
.post-head h1 { font-size: clamp(36px, 6vw, 64px); font-weight: 900; font-stretch: 115%; }
.post-head .lead { margin-top: 18px; }
.post-head time { color: inherit; }
.prose { padding: 56px 0 24px; font-size: 19px; line-height: 1.7; }
.prose > * + * { margin-top: 1.1em; }
.prose h2 { font-size: 28px; margin-top: 1.8em; }
.prose ul, .prose ol { padding-left: 1.2em; }
.prose li + li { margin-top: .45em; }
.prose li::marker { color: var(--amber); }
.prose strong { font-weight: 600; background: linear-gradient(transparent 62%, rgba(245, 176, 65, .35) 0); }
.prose a { color: #0d8a7f; text-underline-offset: 3px; }
.prose blockquote { margin: 1.4em 0; padding: 4px 0 4px 18px; border-left: 3px solid var(--amber); color: var(--ink-soft); font-style: italic; }
.prose img { display: block; width: 100%; height: auto; border-radius: 8px; box-shadow: 0 30px 60px -36px rgba(16, 24, 40, .6); }
.prose p:has(> img:only-child) { margin: 0 0 1.6em; }
.prose code { font: .88em var(--mono); background: var(--paper-2); padding: 2px 5px; border-radius: 4px; }
.post-foot { display: grid; gap: 22px; padding: 24px 0 80px; }
.next-card { display: grid; gap: 6px; padding: 22px 24px; border-radius: 8px; background: #fff; border: 1px solid var(--line-light); text-decoration: none; }
a.next-card:hover { border-color: var(--amber); }
.next-card .kicker { margin: 0; }
.next-card b { font: 800 22px var(--display); font-stretch: 110%; }
.next-card span:last-child { color: var(--ink-soft); font-size: 15px; }
.back { font: 600 14px var(--mono); color: var(--ink-soft); text-decoration: none; }
.back:hover { color: var(--ink); }
.foot a { color: var(--on-night-soft); }

/* reveal on scroll (main.js adds .in) */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

@keyframes rise { from { transform: scaleY(0); } to { transform: scaleY(1); } }
@keyframes pulse { 50% { opacity: .3; } }
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}

@media (max-width: 900px) {
  .top nav { display: none; }
  .prose { font-size: 18px; }
  .nums { grid-template-columns: repeat(2, 1fr); }
  .nums div:nth-child(3) { border-left: 0; padding-left: 0; }
  .nums div:nth-child(-n+2) { border-bottom: 1px solid var(--line-dark); }
  .day { grid-template-columns: repeat(2, 1fr); }
  .media-pair, .news { grid-template-columns: 1fr; }
  .lessons { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .hero { padding: 56px 0 48px; }
  .section { padding: 68px 0; }
  .clock-bar { gap: 2px; }
  .clock-bar i { height: 34px; }
  .nums, .day, .lessons { grid-template-columns: 1fr; }
  .nums div { border-left: 0; padding-left: 0; border-bottom: 1px solid var(--line-dark); }
  .timeline li { grid-template-columns: 1fr; gap: 2px; }
  .cta .btn { width: 100%; }
  .form { padding: 20px; }
}