/* systems.thinking.ai.id: shared thinking.ai.id shell (navy/amber, Poppins + Open Sans) with the Systems lens accent #0E8C86. */
:root {
  --navy: #0C2F52; --lens: #0E8C86; --btn: #0B6F6A; --amber: #F0A202;
  --bg: #F4F7FB; --text: #4A5568; --line: #DCE5F0; --card: #fff; --soft: #EAF1FA; --ok: #1f8a4c; --no: #c0392b;
}
@media (prefers-color-scheme: dark) {
  :root { --navy: #EAF1FA; --bg: #0B1624; --text: #9DB3CC; --line: #1F3350; --card: #11233A; --soft: #0f2036; --btn: #4472C4; --ok: #4cc380; --no: #ff8b7e; }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.65 "Open Sans", "Segoe UI", Arial, sans-serif; }
h1, h2, h3, h4, h5, .brand { font-family: Poppins, "Segoe UI", Arial, sans-serif; color: var(--navy); margin: 0; }
a { color: var(--lens); }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.sr:focus + label { outline: 3px solid var(--amber); outline-offset: 2px; }
.small { font-size: 13px; opacity: .9; }
button { font: inherit; }
:focus-visible { outline: 3px solid var(--amber); outline-offset: 2px; }

/* nav: dark blue like the hub */
.nav { position: sticky; top: 0; z-index: 20; background: rgba(7,24,43,.94); backdrop-filter: blur(8px); border-bottom: 1px solid rgba(255,255,255,.12); }
.navin { max-width: 1240px; margin: 0 auto; padding: 12px 24px; display: flex; align-items: center; gap: 18px; }
.brand { color: #fff; font-weight: 700; text-decoration: none; white-space: nowrap; }
.brand span { color: var(--amber); }
.links { display: flex; align-items: center; gap: 4px 16px; margin-left: auto; flex-wrap: wrap; }
.links a { color: #D3E0EF; text-decoration: none; font-size: 13.5px; }
.links a:hover { color: #fff; }
.links .hub { color: var(--amber); }
.lang { display: inline-flex; border: 1px solid rgba(255,255,255,.2); border-radius: 999px; padding: 2px; background: rgba(255,255,255,.08); }
.lang button { border: 0; background: transparent; color: #D3E0EF; font: 600 12px Poppins, sans-serif; padding: 5px 12px; border-radius: 999px; cursor: pointer; }
.lang button[aria-pressed="true"] { background: var(--amber); color: #0C2F52; }
.nav-toggle { display: none; margin-left: auto; width: 40px; height: 36px; border: 1px solid rgba(255,255,255,.25); background: transparent; border-radius: 8px; cursor: pointer; position: relative; }
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after { content: ""; position: absolute; left: 9px; right: 9px; height: 2px; background: #fff; }
.nav-toggle span { top: 17px; } .nav-toggle span::before { top: -6px; left: 0; right: 0; } .nav-toggle span::after { top: 6px; left: 0; right: 0; }

/* hero */
.hero { color: #fff; background: radial-gradient(900px 500px at 85% 15%, rgba(111,163,217,.3), transparent 60%), linear-gradient(135deg, #07182b 0%, #0C2F52 45%, #0C4F8E 100%); padding: 72px 0 56px; }
.herogrid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 40px; align-items: center; }
.eyebrow { text-transform: uppercase; letter-spacing: .14em; font-size: 12px; font-weight: 600; color: var(--amber); margin: 0 0 12px; }
.hero h1 { color: #fff; font-size: clamp(32px, 5vw, 54px); line-height: 1.12; }
.hero h1 em { font-style: normal; color: var(--amber); }
.question { font: 600 18px Poppins, sans-serif; color: #fff; margin: 18px 0 0; border-left: 3px solid var(--lens); padding-left: 14px; }
.lede { font-size: 18px; max-width: 34em; margin: 16px 0 28px; color: #D3E0EF; }
.herostats { list-style: none; display: flex; flex-wrap: wrap; gap: 8px 32px; padding: 0; margin: 34px 0 0; color: #D3E0EF; font-size: 14px; }
.herostats strong { font: 700 28px Poppins, sans-serif; color: var(--amber); margin-right: 6px; }
.vennbox { display: flex; flex-direction: column; align-items: center; }
.venn { width: min(100%, 380px); height: auto; overflow: visible; }
.vc { cursor: pointer; transition: transform .2s; transform-origin: 150px 190px; }
.vc:hover circle { stroke-opacity: 1; }
.vt { fill: #fff; font: 600 12px Poppins, sans-serif; pointer-events: none; }
.vt.dark { fill: #0C2F52; font-size: 18px; }
.venn-cap { text-align: center; max-width: 340px; margin-top: 8px; color: #D3E0EF; }
.venn-cap strong { font-family: Poppins, sans-serif; color: #fff; font-size: 17px; }
.venn-cap p { margin: 4px 0 6px; font-size: 14px; }
.venn-cap small { opacity: .7; }

/* buttons */
.actions { margin-top: 18px; }
.actions.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.btn { display: inline-block; border: 0; border-radius: 999px; padding: 11px 24px; font: 600 15px "Open Sans", sans-serif; text-decoration: none; cursor: pointer; transition: filter .15s; }
.btn:hover:not(:disabled) { filter: brightness(1.08); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-primary { background: var(--btn); color: #fff; }
.btn-amber { background: var(--amber); color: #0C2F52; }
.btn-ghost { background: transparent; color: var(--navy); border: 1.5px solid var(--line); }
.hero .btn-ghost, .band-dark .btn-ghost { color: #fff; border-color: rgba(255,255,255,.45); }
.btn.sm { padding: 6px 14px; font-size: 13px; }

/* sections */
.sec { padding: 76px 0; }
.sec h2 { font-size: clamp(26px, 3.6vw, 38px); line-height: 1.2; max-width: 22em; }
.sec h3 { font-size: 20px; margin: 40px 0 14px; }
.sub { max-width: 46em; margin: 14px 0 28px; }
.light { background: var(--bg); }
.band-dark { --navy: #fff; --text: #D3E0EF; --card: rgba(255,255,255,.08); --line: rgba(255,255,255,.2); --soft: rgba(255,255,255,.06);
  color: var(--text); background: radial-gradient(800px 400px at 10% 0%, rgba(111,163,217,.22), transparent 60%), linear-gradient(135deg, #0C2F52 0%, #0C4F8E 100%); }
.band-dark a { color: var(--amber); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.card h4 { font-size: 17px; margin-bottom: 6px; }
.card p, .card ul { margin: 6px 0 0; }
.card.glass { backdrop-filter: blur(2px); }
.num { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; background: var(--lens); color: #fff; font: 600 13px Poppins, sans-serif; margin-bottom: 8px; }
.tag { display: inline-block; font: 600 11px Poppins, sans-serif; text-transform: uppercase; letter-spacing: .06em; padding: 2px 8px; border-radius: 999px; background: var(--soft); color: var(--navy); border: 1px solid var(--line); }
.tag.good { background: rgba(31,138,76,.15); color: var(--ok); border-color: var(--ok); }
.tag.poor { background: rgba(192,57,43,.12); color: var(--no); border-color: var(--no); }
.badge { display: inline-block; font: 600 11px Poppins, sans-serif; padding: 3px 10px; border-radius: 999px; background: var(--amber); color: #0C2F52; }

/* definition */
.traits, .mind { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; }
.ico { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 10px; background: var(--amber); color: #0C2F52; font-size: 18px; margin-bottom: 8px; }
.origin { max-width: 52em; margin: 24px 0 0; }
.spaces { display: flex; gap: 8px; margin-bottom: 10px; font: 600 12px Poppins, sans-serif; }
.sp { padding: 4px 12px; border-radius: 999px; } .sp.p { background: rgba(240,162,2,.2); color: var(--amber); } .sp.s { background: rgba(111,163,217,.25); color: #fff; }
.stages5 { list-style: none; display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 14px; padding: 0; margin: 0; counter-reset: s; }
.stages5 small { display: block; margin-top: 8px; opacity: .8; }
.cmp { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 24px; }
.cmp ul { padding-left: 18px; } .cmp .no h4 { color: #ff9f93; } .cmp .yes h4 { color: var(--amber); }
.goal { font: 600 18px Poppins, sans-serif; color: #fff; margin: 24px 0 0; }

/* what for / best / limits / sources */
.benefits, .lims { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 16px; }
.tags { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 0; }
.tags li { padding: 6px 14px; border-radius: 999px; background: var(--card); border: 1px solid var(--line); color: var(--navy); font-size: 14px; }
.ai-box { margin-top: 40px; padding: 28px; border-radius: 16px; color: #D3E0EF; background: linear-gradient(135deg, #0C2F52, #0C4F8E); }
.ai-box h3 { color: #fff; margin-top: 0; } .ai-box blockquote { margin: 0 0 18px; font: 600 18px/1.4 Poppins, sans-serif; color: #fff; border-left: 3px solid var(--amber); padding-left: 14px; }
.ai-box cite { display: block; font: 400 13px "Open Sans", sans-serif; color: var(--amber); margin-top: 6px; font-style: normal; }
.airows { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px 20px; } .airows strong { display: block; color: var(--amber); font-family: Poppins, sans-serif; } .airows span { font-size: 14px; }
.bestlist { list-style: none; padding: 0; margin: 0 0 28px; display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; }
.fit h3 { margin-top: 0; } .fitq { font: 600 18px/1.4 Poppins, sans-serif; color: #fff; margin: 12px 0 0; } .fitq small { display: block; color: var(--amber); font-family: "Open Sans", sans-serif; }
.verdict { font: 600 18px Poppins, sans-serif; margin: 12px 0 0; } .verdict.v0 strong { color: #7fe3a6; } .verdict.v1 strong { color: var(--amber); } .verdict.v2 strong { color: #ff9f93; }
.pair { display: inline-block; margin-top: 10px; font-size: 12.5px; padding: 3px 10px; border-radius: 999px; background: var(--soft); border: 1px solid var(--line); }
.pair b { color: var(--lens); }
.note { margin: 24px 0 8px; padding: 14px 18px; border-left: 4px solid var(--amber); background: var(--card); border-radius: 0 10px 10px 0; color: var(--navy); }
.srcgrid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 16px; margin-bottom: 14px; }
.srcgrid ul { list-style: none; padding: 0; } .srcgrid li { margin: 10px 0; font-size: 14px; } .srcgrid li span { display: block; opacity: .85; }

/* case studies */
.case { margin-bottom: 14px; padding: 0; overflow: hidden; }
.case summary { cursor: pointer; padding: 18px 22px; list-style: none; display: flex; flex-direction: column; gap: 4px; }
.case summary::-webkit-details-marker { display: none; }
.case summary strong { font: 600 18px Poppins, sans-serif; color: var(--navy); }
.tagline { font: 600 11px Poppins, sans-serif; text-transform: uppercase; letter-spacing: .1em; color: var(--lens); }
.cbody { padding: 0 22px 22px; display: grid; gap: 14px; }
.crow h5 { font-size: 13px; text-transform: uppercase; letter-spacing: .08em; color: var(--lens); margin-bottom: 4px; } .crow ul { margin: 0; padding-left: 18px; } .crow p { margin: 0; }
.csteps { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 0; counter-reset: c; }
.csteps li { counter-increment: c; font-size: 13px; padding: 5px 12px; border-radius: 999px; background: var(--soft); border: 1px solid var(--line); }
.csteps li:nth-child(4) { background: rgba(192,57,43,.12); border-color: var(--no); color: var(--no); }

footer { background: #07182b; color: #B8C7D9; text-align: center; padding: 32px 24px; font-size: 13px; }
footer a { color: var(--amber); text-decoration: none; } footer p { margin: 4px 0; }
.noscript { padding: 20px; text-align: center; }

@media (max-width: 900px) {
  .herogrid, .grid2, .cmp { grid-template-columns: 1fr; }
  .nav-toggle { display: block; }
  .links { display: none; position: absolute; left: 0; right: 0; top: 100%; margin: 0; padding: 12px 24px 18px; background: rgba(7,24,43,.98); flex-direction: column; align-items: flex-start; gap: 12px; }
  .links.open { display: flex; }
  .lang { margin-left: 0; }
  .crazy { grid-template-columns: repeat(2, 1fr); } .fid { grid-template-columns: 1fr; }
  .brow { grid-template-columns: 90px 1fr 48px; }
  .sec { padding: 52px 0; } .wrap { padding: 0 16px; } .navin { padding: 10px 16px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; animation: none !important; } }

/* fixes: button colours inside dark bands, spacing between stage blocks */
.band-dark a.btn-amber { color: #0C2F52; }
.band-dark a.btn-ghost, .band-dark .btn-ghost { color: #fff; }
.stage > .card, .stage > .answers, .stage > .cls, .stage > .fb { margin-top: 14px; }

/* systems additions */
.iceberg { display: grid; gap: 8px; width: min(100%, 420px); }
.ice { text-align: left; border: 1px solid rgba(255,255,255,.25); border-radius: 12px; padding: 12px 16px; color: #fff; cursor: pointer; font: 600 14px Poppins, sans-serif; display: flex; justify-content: space-between; gap: 12px; background: rgba(255,255,255,.08); }
.ice small { font: 400 12px "Open Sans", sans-serif; opacity: .8; }
.ice[aria-pressed="true"] { background: var(--amber); color: #0C2F52; border-color: var(--amber); }
.ice:nth-child(1) { margin-right: 0; } .ice:nth-child(2) { margin-right: 10%; } .ice:nth-child(3) { margin-right: 20%; } .ice:nth-child(4) { margin-right: 30%; }
.loops { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin-top: 18px; }
.tool-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; margin-top: 18px; }
.cpick { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 18px; }
.chip { border: 1.5px solid var(--line); background: var(--card); color: var(--navy); padding: 8px 16px; border-radius: 999px; cursor: pointer; font: 600 14px "Open Sans", sans-serif; }
.chip[aria-pressed="true"] { background: var(--btn); color: #fff; border-color: var(--btn); }
.mission { display: grid; grid-template-columns: 1.1fr .9fr; gap: 20px; }
.mission .facts { display: flex; flex-wrap: wrap; gap: 8px 22px; margin: 12px 0 0; padding: 0; list-style: none; }
.mission .facts strong { display: block; font: 700 22px Poppins, sans-serif; color: var(--navy); }
.mission .facts span { font-size: 12px; text-transform: uppercase; letter-spacing: .08em; }
.stepsline { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 12px 0 0; }
.stepsline li { font-size: 13px; padding: 5px 12px; border-radius: 999px; background: var(--soft); border: 1px solid var(--line); }
.crow ul { margin: 0; padding-left: 18px; }
@media (max-width: 900px) { .mission { grid-template-columns: 1fr; } .ice { margin-right: 0 !important; } }
.band-dark a.btn-primary { color: #fff; background: var(--btn); }
.band-dark .tagline, .band-dark .crow h5 { color: var(--amber); }
.mission h5 { margin: 14px 0 2px; font-size: 12px; text-transform: uppercase; letter-spacing: .08em; color: var(--lens); }
.mission p { margin: 0; }
.stepsline li { color: var(--text); }

/* Hero photo (site/assets/hero-systems.jpg, 16:9, about 2752x1536). Added only once the file loads (see landing.js),
   so the hero is unchanged without it. Same recipe as the thinking.ai.id hub hero. */
main > section.hero.has-photo {
  background:
    linear-gradient(90deg, #07182b 0%, rgba(7,24,43,.92) 30%, rgba(7,24,43,.55) 55%, rgba(7,24,43,.25) 100%),
    linear-gradient(0deg, #07182b 0%, rgba(7,24,43,0) 22%),
    linear-gradient(135deg, rgba(14,140,134,.28), rgba(7,24,43,.12)),
    url("../../assets/hero-systems.jpg") 78% center / cover no-repeat,
    #07182b;
}
.hero.has-photo h1, .hero.has-photo .lede { text-shadow: 0 2px 18px rgba(7,24,43,.7); }
.hero.has-photo .ice { background: rgba(7,24,43,.55); backdrop-filter: blur(6px); border-color: rgba(255,255,255,.35); }
.hero.has-photo .ice[aria-pressed="true"] { background: var(--amber); border-color: var(--amber); }
.hero.has-photo .venn-cap { text-shadow: 0 1px 10px rgba(7,24,43,.9); }
@media (max-width: 800px) {
  main > section.hero.has-photo {
    background:
      linear-gradient(180deg, rgba(7,24,43,.9) 0%, rgba(7,24,43,.74) 55%, #07182b 100%),
      linear-gradient(135deg, rgba(14,140,134,.28), rgba(7,24,43,.12)),
      url("../../assets/hero-systems.jpg") 70% center / cover no-repeat,
      #07182b;
  }
}

/* Animated iceberg: staggered float, active card lifts and slides, progress bar, slow rotating ring, caption fade. */
.vennbox { position: relative; }
.ice-ring { position: absolute; inset: -6% -4% auto -4%; aspect-ratio: 1; border-radius: 50%; border: 1.5px dashed rgba(255,255,255,.22); animation: ice-spin 48s linear infinite; pointer-events: none; }
.ice-ring::after { content: ""; position: absolute; top: -5px; left: 50%; width: 10px; height: 10px; margin-left: -5px; border-radius: 50%; background: var(--amber); box-shadow: 0 0 14px 2px rgba(240,162,2,.7); }
.iceberg { position: relative; }
.ice { position: relative; overflow: hidden; transition: transform .5s cubic-bezier(.2,.8,.2,1), background .35s, box-shadow .35s, margin .5s cubic-bezier(.2,.8,.2,1);
  animation: ice-float 6s ease-in-out infinite; animation-delay: calc(var(--i, 0) * -1.4s); }
.ice[aria-pressed="true"] { transform: translateX(10px) scale(1.035); box-shadow: 0 10px 30px rgba(240,162,2,.35); animation-play-state: paused; z-index: 2; }
.ice .ice-bar { position: absolute; left: 0; bottom: 0; height: 3px; width: 0; background: rgba(12,47,82,.55); }
.ice[aria-pressed="true"] .ice-bar { animation: ice-fill var(--ms, 4500ms) linear forwards; }
.iceberg:hover .ice-bar, .iceberg:focus-within .ice-bar { animation-play-state: paused; }
.venn-cap.swap { animation: ice-swap .55s cubic-bezier(.2,.8,.2,1); }
@keyframes ice-spin { to { transform: rotate(360deg); } }
@keyframes ice-float { 0%, 100% { translate: 0 0; } 50% { translate: 0 -4px; } }
@keyframes ice-fill { from { width: 0; } to { width: 100%; } }
@keyframes ice-swap { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .ice-ring, .ice, .venn-cap.swap, .ice .ice-bar { animation: none !important; } .ice[aria-pressed="true"] { transform: none; } }
@media (max-width: 900px) { .ice-ring { display: none; } .ice[aria-pressed="true"] { transform: scale(1.02); } }