/* otto365.ai design system.
   Brand tokens verified live (apps365ltd.com / apps365.ai, 2026-09-22): indigo #4554EA, AA indigo text #3A46C8,
   ink #0F162E, charcoal logo #232323. Fonts match the Brief videos (Poppins) + Inter for reading.
   Readability rules (docs/research/20): 19px article body, 50-75 characters per line, line height >= 1.5. */

@font-face { font-family: "Poppins"; font-weight: 600; font-display: swap; src: url("../fonts/poppins-latin-600.woff2") format("woff2"); }
@font-face { font-family: "Poppins"; font-weight: 700; font-display: swap; src: url("../fonts/poppins-latin-700.woff2") format("woff2"); }
@font-face { font-family: "Poppins"; font-weight: 800; font-display: swap; src: url("../fonts/poppins-latin-800.woff2") format("woff2"); }
@font-face { font-family: "Inter"; font-weight: 100 900; font-display: swap; src: url("../fonts/inter-latin-var.woff2") format("woff2"); }

:root {
  --indigo: #4554EA;
  --indigo-text: #3A46C8;
  --violet: #6E63F0;
  --lavender: #948CF6;
  --wash: #E8E8F6;
  --ink: #0F162E;
  --ink-2: #3E445B;
  --ink-3: #5B6275;
  --paper: #F6F7FB;
  --card: #FFFFFF;
  --line: #E3E5EE;
  --night: #0A0F24;
  --night-2: #131A38;
  --on-night: #EEF0FC;
  --on-night-2: #B4B9D6;
  --ok: #0E7C4A;
  --warn: #9A5B00;

  --font-display: "Poppins", "Segoe UI", system-ui, sans-serif;
  --font-text: "Inter", "Segoe UI", system-ui, sans-serif;

  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 1px 2px rgba(15, 22, 46, .06), 0 8px 28px rgba(15, 22, 46, .08);
  --wrap: 1180px;
  --measure: 68ch;
  --gutter: clamp(18px, 4vw, 40px);
  --header-h: 68px;
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-padding-top: calc(var(--header-h) + 12px); }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.6 var(--font-text);
  font-feature-settings: "cv11", "ss01";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg, video, canvas { display: block; max-width: 100%; }
img, video { height: auto; }
a { color: var(--indigo-text); text-underline-offset: .18em; text-decoration-thickness: .08em; }
a:hover { color: var(--ink); }
:focus-visible { outline: 3px solid var(--indigo); outline-offset: 3px; border-radius: 6px; }
h1, h2, h3, h4 { font-family: var(--font-display); color: var(--ink); line-height: 1.15; letter-spacing: -.015em; margin: 0 0 .5em; text-wrap: balance; }
h1 { font-size: clamp(2.1rem, 1.3rem + 3.4vw, 3.9rem); font-weight: 800; }
h2 { font-size: clamp(1.6rem, 1.2rem + 1.7vw, 2.5rem); font-weight: 800; }
h3 { font-size: clamp(1.15rem, 1.05rem + .4vw, 1.35rem); font-weight: 700; letter-spacing: -.005em; }
p { margin: 0 0 1em; text-wrap: pretty; }
.ic { display: inline-block; vertical-align: -0.18em; width: 1.15em; height: 1.15em; flex: none; }
.sr-only { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip { position: absolute; left: 12px; top: -60px; z-index: 100; background: var(--ink); color: #fff; padding: 10px 16px; border-radius: 10px; font-weight: 600; }
.skip:focus { top: 12px; color: #fff; }

.wrap { width: min(100% - 2 * var(--gutter), var(--wrap)); margin-inline: auto; }
.measure { max-width: var(--measure); }
.eyebrow { font: 600 .8rem/1.2 var(--font-text); letter-spacing: .14em; text-transform: uppercase; color: var(--indigo-text); display: inline-flex; align-items: center; gap: .5em; margin-bottom: 1rem; }
.lead { font-size: clamp(1.1rem, 1rem + .5vw, 1.3rem); color: var(--ink-2); line-height: 1.55; }
.muted { color: var(--ink-3); }
.num { font-variant-numeric: tabular-nums; }

/* Buttons: pill, one primary per view (TikTok lesson: one fixed CTA). */
.btn { --b: var(--indigo); display: inline-flex; align-items: center; gap: .55em; min-height: 48px; padding: 0 22px; border-radius: 999px; border: 1.5px solid var(--b); background: var(--b); color: #fff; font: 600 1rem/1 var(--font-text); text-decoration: none; cursor: pointer; transition: transform .15s ease, box-shadow .2s ease, background .2s ease; }
.btn:hover { color: #fff; background: #3743d6; box-shadow: 0 8px 24px rgba(69, 84, 234, .32); transform: translateY(-1px); }
.btn.ghost { background: transparent; color: var(--ink); border-color: rgba(15, 22, 46, .22); }
.btn.ghost:hover { background: #fff; color: var(--ink); box-shadow: var(--shadow); }
.btn.sm { min-height: 40px; padding: 0 16px; font-size: .92rem; }
.on-night .btn.ghost { color: var(--on-night); border-color: rgba(238, 240, 252, .35); }
.on-night .btn.ghost:hover { background: rgba(255, 255, 255, .08); color: #fff; }

/* Header: fixed logo + one CTA, always. */
.site-header { position: fixed; inset: 0 0 auto 0; z-index: 50; height: var(--header-h); display: flex; align-items: center; transition: background .25s ease, box-shadow .25s ease, backdrop-filter .25s ease; }
.site-header.solid, .page .site-header { background: rgba(246, 247, 251, .86); backdrop-filter: saturate(1.4) blur(12px); -webkit-backdrop-filter: saturate(1.4) blur(12px); box-shadow: 0 1px 0 var(--line); }
.site-header .wrap { display: flex; align-items: center; gap: 24px; }
.brand { display: inline-flex; align-items: center; flex: none; }
.brand img { height: 36px; width: auto; }
.brand .logo-white { display: none; }
.site-header.on-dark .brand .logo-white { display: block; }
.site-header.on-dark .brand .logo-ink { display: none; }
.site-header.on-dark.solid { background: rgba(10, 15, 36, .74); box-shadow: 0 1px 0 rgba(255, 255, 255, .07); }
.nav { display: flex; gap: 4px; margin-left: auto; }
.nav a { color: var(--ink-2); text-decoration: none; font-weight: 550; font-size: .95rem; padding: 8px 12px; border-radius: 999px; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); background: rgba(15, 22, 46, .06); }
.site-header.on-dark .nav a { color: var(--on-night-2); }
.site-header.on-dark .nav a:hover { color: #fff; background: rgba(255, 255, 255, .08); }
.menu-btn { display: none; margin-left: auto; background: none; border: 0; padding: 10px; color: inherit; cursor: pointer; }
@media (max-width: 860px) {
  .nav { display: none; position: absolute; top: var(--header-h); left: 0; right: 0; flex-direction: column; background: var(--paper); padding: 10px var(--gutter) 18px; box-shadow: 0 12px 24px rgba(15, 22, 46, .12); }
  .nav.open { display: flex; }
  .nav a { padding: 12px; font-size: 1.05rem; color: var(--ink) !important; }
  .menu-btn { display: inline-flex; margin-left: 0; }
  .site-header.on-dark .menu-btn { color: #fff; }
  .site-header .btn.sm { margin-left: auto; min-height: 38px; padding: 0 14px; font-size: .88rem; }
  .brand img { height: 32px; }
  .site-header .wrap { gap: 8px; }
}

main { display: block; }
.page main { padding-top: calc(var(--header-h) + clamp(24px, 5vw, 56px)); padding-bottom: clamp(48px, 8vw, 96px); }
.section { padding-block: clamp(56px, 9vw, 112px); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.chip { display: inline-flex; align-items: center; gap: .4em; padding: 5px 12px; border-radius: 999px; font: 600 .82rem/1.2 var(--font-text); background: var(--wash); color: var(--indigo-text); }
.chip.ai { background: #EEF0FF; color: var(--ink-2); }
.breadcrumbs { font-size: .9rem; color: var(--ink-3); margin-bottom: 18px; }
.breadcrumbs a { color: var(--ink-3); }

/* Long-form reading (policy pages + episode text). */
.prose { max-width: var(--measure); font-size: 1.1875rem; line-height: 1.65; color: var(--ink-2); }
.prose h2 { font-size: clamp(1.35rem, 1.2rem + .7vw, 1.75rem); margin-top: 2em; color: var(--ink); }
.prose h3 { margin-top: 1.6em; }
.prose ul, .prose ol { padding-left: 1.2em; }
.prose li { margin: .35em 0; }
.prose strong { color: var(--ink); }
.updated { font-size: .9rem; color: var(--ink-3); }

/* Footer */
.site-footer { background: var(--night); color: var(--on-night-2); padding: 64px 0 36px; font-size: .95rem; }
.site-footer a { color: var(--on-night); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; color: #fff; }
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 36px; }
.foot-grid h2 { font: 700 .82rem/1.2 var(--font-text); letter-spacing: .12em; text-transform: uppercase; color: var(--on-night-2); margin-bottom: 14px; }
.foot-grid ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 9px; }
.foot-brand img { height: 40px; width: auto; margin-bottom: 16px; }
.foot-brand p { max-width: 34ch; }
.disclosure-line { display: inline-flex; gap: .5em; align-items: center; color: var(--on-night); font-weight: 600; }
.foot-legal { border-top: 1px solid rgba(255, 255, 255, .1); margin-top: 44px; padding-top: 22px; display: flex; flex-wrap: wrap; gap: 8px 22px; justify-content: space-between; font-size: .86rem; }
.social { display: flex; gap: 8px; flex-wrap: wrap; }
.social a { display: inline-flex; width: 40px; height: 40px; align-items: center; justify-content: center; border-radius: 12px; background: rgba(255, 255, 255, .06); }
.social a:hover { background: rgba(255, 255, 255, .14); }
.social svg { width: 18px; height: 18px; }
@media (max-width: 900px) { .foot-grid { grid-template-columns: 1fr 1fr; } .foot-brand { grid-column: 1 / -1; } }
@media (max-width: 520px) { .foot-grid { grid-template-columns: 1fr; } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}
.foot-brand .commercial { font-size: .88rem; max-width: 36ch; }

/* Content pages */
.page-head { margin-bottom: clamp(28px, 4vw, 44px); }
.page-head .lead { margin-top: .4em; }
.callout { display: flex; gap: 12px; align-items: flex-start; background: var(--wash); border-radius: var(--radius-sm); padding: 16px 18px; color: var(--ink); }
.callout .ic { color: var(--indigo-text); margin-top: .25em; }
.prose .empty { display: flex; gap: 10px; align-items: flex-start; background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 14px 16px; }
.prose .empty .ic { color: var(--ok); margin-top: .3em; }
.prose code { font-size: .9em; background: var(--wash); padding: .1em .35em; border-radius: 6px; }
.log { list-style: none; padding: 0; display: grid; gap: 14px; }
.log li { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 14px 16px; }
.empty-state { display: flex; gap: clamp(18px, 4vw, 36px); align-items: center; padding: clamp(24px, 5vw, 48px); max-width: 860px; }
.empty-state .actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }
.empty-mark { flex: none; width: clamp(72px, 12vw, 120px); aspect-ratio: 1; border-radius: 28px; background: var(--wash); display: grid; place-items: center; }
.empty-mark img { width: 72%; }
@media (max-width: 600px) { .empty-state { flex-direction: column; align-items: flex-start; } }
.ep-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 22px; }
.ep-card a { display: grid; gap: 8px; padding: 14px 14px 18px; color: var(--ink); text-decoration: none; }
.ep-card img { border-radius: 12px; aspect-ratio: 16 / 9; object-fit: cover; background: var(--night); }
.ep-card:hover { box-shadow: 0 1px 2px rgba(15, 22, 46, .06), 0 14px 36px rgba(15, 22, 46, .14); }
.ep-meta { display: flex; gap: 8px; align-items: center; font-weight: 700; color: var(--indigo-text); }
.ep-title { font: 700 1.2rem/1.25 var(--font-display); }
.ep-hook { color: var(--ink-2); }
.chip.warn { background: #FFF3E0; color: var(--warn); }