:root {
  --ink: #241d47;
  --ink-soft: #5b5477;
  --lavender: #eeebff;
  --paper: #fffcf5;
  --line: #d8d1ea;
  --citrus: #e8ff6a;
  --coral: #ff6b4a;
  --blue: #5868ff;
  --deep-blue: #15102f;
  --white: #ffffff;
  --shadow: 0 18px 50px rgba(36, 29, 71, 0.12);
}

* { box-sizing: border-box; }
html { background: var(--paper); }
body { margin: 0; color: var(--ink); background: radial-gradient(circle at 92% 7%, rgba(88, 104, 255, .13), transparent 25rem), var(--paper); font-family: "DM Sans", ui-sans-serif, system-ui, sans-serif; line-height: 1.5; }
button, a { font: inherit; }
button { cursor: pointer; }
a { color: inherit; }

.topbar { width: min(1220px, calc(100% - 3rem)); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; padding: 1.3rem 0; }
.brand { display: inline-flex; align-items: center; gap: .65rem; color: var(--ink); font-size: .76rem; font-weight: 700; letter-spacing: .08em; text-decoration: none; text-transform: uppercase; }
.pulse { display: flex; align-items: flex-end; gap: 3px; height: 1rem; }
.pulse i { display: block; width: 3px; border-radius: 99px; background: var(--coral); }
.pulse i:nth-child(1) { height: .4rem; }.pulse i:nth-child(2) { height: 1rem; }.pulse i:nth-child(3) { height: .65rem; }
.edition { color: var(--ink-soft); font-family: "DM Mono", monospace; font-size: .69rem; letter-spacing: .08em; text-transform: uppercase; }

.hero { width: min(1220px, calc(100% - 3rem)); min-height: 31rem; margin: .2rem auto 4.5rem; display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(16rem, .62fr); gap: 2rem; align-items: end; padding: clamp(2.2rem, 6vw, 6.5rem); overflow: hidden; border-radius: 1.6rem; background: var(--deep-blue); color: var(--white); box-shadow: var(--shadow); position: relative; }
.hero::before { content: ""; position: absolute; width: 28rem; height: 28rem; border: 4rem solid var(--citrus); border-radius: 50%; right: -12rem; top: -13rem; opacity: .92; }
.hero::after { content: ""; position: absolute; width: 15rem; height: 15rem; border: 1px solid rgba(255,255,255,.38); border-radius: 50%; right: 9rem; bottom: -9rem; }
.hero-copy, .hero-note { position: relative; z-index: 1; }
.eyebrow { margin: 0 0 .8rem; color: var(--coral); font-family: "DM Mono", monospace; font-size: .71rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
h1, h2, h3 { font-family: "Playfair Display", Georgia, serif; font-weight: 600; letter-spacing: -.045em; line-height: 1.04; }
h1 { max-width: 9ch; margin: 0; font-size: clamp(3.3rem, 7vw, 6.8rem); }
h1 em { color: #d6d2ff; font-style: italic; }
.lede { max-width: 33rem; margin: 1.55rem 0 0; color: #d9d6ed; font-size: 1.1rem; }
.start-button { display: inline-flex; align-items: center; gap: .8rem; margin-top: 2rem; padding: .9rem 1.1rem; border: 0; border-radius: .4rem; background: var(--citrus); color: var(--deep-blue); font-weight: 800; transition: transform .18s ease, background .18s ease; }
.start-button:hover, .start-button:focus-visible { transform: translateY(-2px); background: #f0ff9f; outline: none; }
.hero-note { padding: 1.3rem; border: 1px solid rgba(255,255,255,.25); border-radius: .9rem; background: rgba(255,255,255,.08); backdrop-filter: blur(8px); color: #ecebfa; }
.hero-note p { margin: .65rem 0 0; font-size: .92rem; }.hero-note strong { color: var(--white); }.note-index { display: inline-grid; place-items: center; width: 1.6rem; height: 1.6rem; border-radius: 50%; background: var(--citrus); color: var(--deep-blue); font-family: "DM Mono", monospace; font-size: .7rem; font-weight: 700; }

.sprint { width: min(1030px, calc(100% - 3rem)); margin: 0 auto 5rem; }
.sprint-topline { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; }.sprint-topline h2 { max-width: 19ch; margin: 0; font-size: clamp(2.1rem, 4vw, 3.65rem); }.time { margin: .5rem 0 0; color: var(--ink-soft); font-family: "DM Mono", monospace; font-size: .72rem; white-space: nowrap; }
.progress { display: flex; gap: .75rem; padding: 0; margin: 2.4rem 0 1.4rem; list-style: none; }.progress li { display: flex; flex: 1; align-items: center; gap: .45rem; padding: .6rem 0; border-bottom: 2px solid var(--line); color: #9891aa; font-family: "DM Mono", monospace; font-size: .66rem; text-transform: uppercase; }.progress li span { display: inline-grid; place-items: center; width: 1.4rem; height: 1.4rem; border: 1px solid currentColor; border-radius: 50%; }.progress li.active { border-color: var(--blue); color: var(--blue); }.progress li.complete { border-color: var(--coral); color: var(--coral); }.progress li.active span { background: var(--blue); color: var(--white); }.progress li.complete span { background: var(--coral); color: var(--white); }
.design-strip { display: grid; grid-template-columns: repeat(3, 1fr); margin: 0 0 2.4rem; overflow: hidden; border: 1px solid var(--line); border-radius: .85rem; background: var(--lavender); }.design-strip p { min-height: 5.2rem; margin: 0; padding: 1rem 1.1rem; border-right: 1px solid var(--line); }.design-strip p:last-child { border: 0; }.design-strip span, .mini-label { display: block; margin-bottom: .28rem; color: var(--ink-soft); font-family: "DM Mono", monospace; font-size: .64rem; letter-spacing: .07em; text-transform: uppercase; }.design-strip strong { font-size: .9rem; line-height: 1.25; }
.choice-step, .knowledge-check, .experiment { margin-top: 1.5rem; padding: clamp(1.35rem, 3vw, 2.4rem); border: 1px solid var(--line); border-radius: 1rem; background: var(--white); box-shadow: 0 8px 20px rgba(36,29,71,.04); animation: appear .3s ease both; }.choice-step[hidden], .knowledge-check[hidden], .experiment[hidden], .sprint[hidden] { display: none; }@keyframes appear { from { opacity: 0; transform: translateY(.65rem); } to { opacity: 1; transform: translateY(0); } }.step-label { margin: 0 0 .55rem; color: var(--blue); font-family: "DM Mono", monospace; font-size: .68rem; font-weight: 700; letter-spacing: .09em; text-transform: uppercase; }.choice-step h3, .knowledge-check h3 { max-width: 31ch; margin: 0; font-size: clamp(1.6rem, 3vw, 2.5rem); }.step-support { max-width: 48rem; margin: .7rem 0 1.45rem; color: var(--ink-soft); }.choice-grid { display: grid; gap: .7rem; }.choice-card { display: grid; grid-template-columns: 2.25rem minmax(0,1fr); gap: .75rem; align-items: start; width: 100%; padding: 1rem; border: 1px solid var(--line); border-radius: .72rem; background: transparent; color: var(--ink); text-align: left; transition: border-color .16s ease, box-shadow .16s ease, background .16s ease, transform .16s ease; }.choice-card:hover, .choice-card:focus-visible { border-color: var(--blue); background: #f8f7ff; box-shadow: 0 8px 16px rgba(36,29,71,.08); transform: translateX(.2rem); outline: none; }.choice-card.selected { border-color: var(--blue); background: var(--lavender); }.choice-number { display: inline-grid; place-items: center; width: 1.7rem; height: 1.7rem; border: 1px solid currentColor; border-radius: 50%; color: var(--blue); font-family: "DM Mono", monospace; font-size: .69rem; font-weight: 700; }.choice-card.selected .choice-number { background: var(--blue); color: var(--white); }.choice-card strong { display: block; font-size: .98rem; }.choice-card small { display: block; margin-top: .15rem; color: var(--ink-soft); font-size: .82rem; line-height: 1.35; }.step-reveal, .boundary-note { margin: 1.15rem 0 0; padding: .85rem 1rem; border-left: 3px solid var(--coral); background: #fff4ef; color: #5a3a35; font-size: .9rem; }.boundary-note { border-left-color: var(--blue); background: #f2f0ff; color: var(--ink-soft); }
.check-options { display: grid; gap: .7rem; margin-top: 1.35rem; }.check-options button { display: flex; align-items: flex-start; gap: .75rem; width: 100%; padding: .9rem; border: 1px solid var(--line); border-radius: .7rem; background: var(--paper); color: var(--ink); text-align: left; font-size: .9rem; transition: border-color .16s ease, background .16s ease; }.check-options button:hover, .check-options button:focus-visible { border-color: var(--blue); outline: none; }.check-options button.selected { border-color: var(--blue); background: var(--lavender); }.check-options button.correct { border-color: #29855f; background: #eaf8ef; }.check-options b { flex: 0 0 auto; font-family: "DM Mono", monospace; }.check-feedback { margin-top: 1rem; padding: 1rem; border-radius: .7rem; background: #eaf8ef; color: #21583e; font-size: .92rem; }.check-feedback.incomplete { background: #fff4ef; color: #6d3d31; }
.experiment { border-color: var(--ink); background: #fffcf5; }.experiment-intro { display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; }.experiment h2 { max-width: 16ch; margin: 0; font-size: clamp(2rem, 4vw, 3.2rem); }.prototype-tag { padding: .35rem .55rem; border: 1px solid var(--ink); border-radius: 999px; font-family: "DM Mono", monospace; font-size: .62rem; letter-spacing: .05em; text-transform: uppercase; white-space: nowrap; }.experiment-summary { max-width: 47rem; margin: 1.2rem 0; font-size: 1.04rem; }.experiment-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }.experiment-columns section { padding: 1rem; border-radius: .7rem; background: var(--lavender); }.experiment-columns p { margin: 0; font-size: .92rem; }.experiment-ticket { margin-top: 1rem; padding: 1.2rem; border: 1px dashed var(--blue); border-radius: .7rem; background: var(--white); }.ticket-label { display: block; margin-bottom: .45rem; color: var(--blue); font-family: "DM Mono", monospace; font-size: .67rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }.experiment-ticket ol { margin: .4rem 0 0; padding-left: 1.25rem; }.experiment-ticket li + li { margin-top: .45rem; }.experiment-actions { display: flex; flex-wrap: wrap; align-items: center; gap: .8rem; margin-top: 1.25rem; }.copy-button, .restart-button { border-radius: .45rem; padding: .78rem 1rem; font-weight: 700; }.copy-button { border: 1px solid var(--ink); background: var(--ink); color: var(--white); }.copy-button:hover, .copy-button:focus-visible { background: var(--blue); outline: none; }.restart-button { border: 1px solid var(--ink); background: transparent; color: var(--ink); }.copy-status { width: 100%; min-height: 1.2rem; margin: 0; color: #257052; font-size: .85rem; font-weight: 700; }
footer { width: min(1220px, calc(100% - 3rem)); margin: 0 auto 2rem; padding: 1.4rem 0; display: flex; justify-content: space-between; gap: 1.5rem; border-top: 1px solid var(--line); color: var(--ink-soft); font-size: .8rem; }footer p { margin: 0; }footer p + p { margin-top: .25rem; }.resource-links { display: flex; flex-direction: column; gap: .35rem; }.resource-links a { font-weight: 700; text-underline-offset: .25rem; }.resource-links span { color: var(--coral); }
@media (max-width: 760px) { .topbar, .hero, .sprint, footer { width: min(100% - 1.5rem, 1220px); }.topbar { padding: 1rem 0; }.edition { display: none; }.hero { min-height: 0; grid-template-columns: 1fr; margin-bottom: 3rem; padding: 2.2rem 1.4rem; }.hero::before { width: 16rem; height: 16rem; border-width: 2.5rem; right: -8rem; top: -7rem; }.hero::after { display: none; }h1 { font-size: clamp(3rem, 15vw, 4.7rem); }.hero-note { max-width: 28rem; }.sprint { margin-bottom: 3rem; }.sprint-topline { display: block; }.time { margin-top: .7rem; }.progress { gap: .3rem; }.progress li { font-size: 0; }.progress li span { font-size: .68rem; }.design-strip { grid-template-columns: 1fr; }.design-strip p { min-height: 0; padding: .75rem .9rem; border-right: 0; border-bottom: 1px solid var(--line); }.design-strip p:last-child { border-bottom: 0; }.choice-step, .knowledge-check, .experiment { padding: 1.2rem; }.experiment-intro { display: block; }.prototype-tag { display: inline-block; margin-top: .75rem; }.experiment-columns { grid-template-columns: 1fr; }footer { flex-direction: column; }.resource-links { gap: .55rem; } }
@media (prefers-reduced-motion: reduce) { *,*::before,*::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; } }