/* ============================================================
   guide.clmb.io — From zero to shipping with AI
   "Friendly paper, authentic terminal"
   ============================================================ */

:root {
  /* paper world */
  --paper:      #F3F1EA;
  --paper-2:    #ECE9DF;
  --ink:        #1C1A17;
  --ink-soft:   #4a463f;
  --muted:      #6B655C;
  --line:       #E0DBCF;
  --coral:      #CB5E3C;
  --coral-dk:   #b94f30;
  --coral-soft: #F3E3DA;

  /* terminal world */
  --term-bg:    #171B23;
  --term-bar:   #20252F;
  --term-text:  #E6E4DE;
  --term-dim:   #7C8493;
  --term-coral: #E2966F;
  --term-green: #8FBF9F;
  --term-cyan:  #6FB7C9;
  --term-amber: #E0B05C;

  --maxw: 720px;
  --rail: 250px;

  --sans: "IBM Plex Sans", system-ui, -apple-system, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --disp: "Bricolage Grotesque", var(--sans);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--sans); font-weight: 450; font-size: 17px; line-height: 1.62;
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
a { color: var(--coral); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------------- top bar ---------------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 16px;
  height: 52px; padding: 0 22px;
  background: rgba(243,241,234,0.84); backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand { font-family: var(--mono); font-size: 14px; font-weight: 500; letter-spacing: -0.01em; display: flex; align-items: center; gap: 8px; color: var(--ink); }
.brand .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--coral); }
.brand b { color: var(--coral); font-weight: 600; }
.topbar .tag { color: var(--muted); font-size: 13.5px; }
.topbar .spacer { flex: 1; }
.progress { display: flex; align-items: center; gap: 10px; font-family: var(--mono); font-size: 12.5px; color: var(--muted); }
.progress .bars { display: flex; gap: 3px; }
.progress .bars i { width: 13px; height: 9px; border-radius: 2px; background: var(--line); display: inline-block; transition: background .25s ease; }
.progress .bars i.on { background: var(--coral); }
.topbar .util { display: flex; gap: 4px; }
.topbar .util button { font: inherit; font-family: var(--mono); font-size: 12.5px; color: var(--muted); background: none; border: 1px solid transparent; padding: 5px 9px; border-radius: 7px; cursor: pointer; }
.topbar .util button:hover { color: var(--ink); background: var(--paper-2); }

/* ---------------- layout ---------------- */
.layout { display: grid; grid-template-columns: var(--rail) minmax(0,1fr); max-width: 1180px; margin: 0 auto; }
.rail { position: sticky; top: 52px; align-self: start; height: calc(100vh - 52px); overflow-y: auto; padding: 34px 18px 34px 26px; border-right: 1px solid var(--line); }
.rail h4 { font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); margin: 0 0 14px 8px; font-weight: 600; }
.rail a { display: flex; align-items: baseline; gap: 10px; text-decoration: none; color: var(--ink); font-size: 14.5px; padding: 7px 10px; border-radius: 8px; opacity: 0.78; }
.rail a span.n { font-family: var(--mono); font-size: 12px; color: var(--muted); width: 18px; flex: none; }
.rail a:hover { background: var(--paper-2); opacity: 1; text-decoration: none; }
.rail a.active { background: var(--coral-soft); color: var(--coral); opacity: 1; font-weight: 500; }
.rail a.active span.n { color: var(--coral); }
.rail a .donebadge { margin-left: auto; color: #3f7d54; font-size: 12px; opacity: 0; transition: opacity .2s; }
.rail a.done .donebadge { opacity: 1; }
.rail a.locked { opacity: 0.4; pointer-events: none; }
.rail a.locked .donebadge { display: none; }
.rail a.locked::after { content: "🔒"; margin-left: auto; font-size: 10px; opacity: 0.65; }
.rail .session { margin-top: 26px; padding: 12px; border: 1px dashed var(--line); border-radius: 10px; font-family: var(--mono); font-size: 12px; color: var(--muted); line-height: 1.7; }
.rail .session b { color: var(--coral); }

.content { padding: 0 40px 160px; min-width: 0; }
.wrap { max-width: var(--maxw); margin: 0 auto; }

/* ---------------- hero ---------------- */
.hero { padding: 72px 0 24px; }
.eyebrow { font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.03em; color: var(--coral); font-weight: 500; }
.hero h1 { font-family: var(--disp); font-weight: 800; font-size: clamp(40px, 6vw, 62px); line-height: 1.02; letter-spacing: -0.02em; margin: 16px 0 0; }
.hero h1 .soft { color: var(--muted); }
.hero .lede { font-size: 19px; color: var(--ink-soft); max-width: 600px; margin: 22px 0 0; }
.hero .lede b { color: var(--ink); font-weight: 600; }

/* ---------------- sections ---------------- */
section.step { padding: 56px 0 0; scroll-margin-top: 70px; }
.step[hidden] { display: none; }
.section-head { display: flex; align-items: center; gap: 14px; margin-bottom: 4px; }
.section-head .num { font-family: var(--mono); font-size: 13px; color: var(--coral); font-weight: 600; }
.section-head .rule { flex: 1; height: 1px; background: var(--line); }
h2 { font-family: var(--disp); font-weight: 700; font-size: 33px; letter-spacing: -0.015em; margin: 6px 0 8px; }
.lede-2 { font-size: 18px; color: var(--ink-soft); margin: 0 0 8px; }
h3 { font-family: var(--disp); font-weight: 700; font-size: 22px; letter-spacing: -0.01em; margin: 40px 0 10px; display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
h3 .mc { font-family: var(--mono); font-size: 17px; color: var(--coral); font-weight: 600; background: var(--coral-soft); padding: 2px 9px; border-radius: 6px; }
h4.sub { font-family: var(--disp); font-weight: 600; font-size: 17.5px; margin: 28px 0 8px; color: var(--ink); }
p.body { margin: 0 0 16px; }
p.body code, li code, .inline-code, .gloss code, .card code, dd code { font-family: var(--mono); font-size: 0.85em; background: var(--paper-2); padding: 1.5px 6px; border-radius: 5px; border: 1px solid var(--line); }
ul.body, ol.body { margin: 0 0 16px; padding-left: 22px; }
ul.body li, ol.body li { margin: 5px 0; }

/* ---------------- terminal card (the signature) ---------------- */
.term { background: var(--term-bg); border-radius: 11px; overflow: hidden; box-shadow: 0 1px 0 rgba(0,0,0,0.04), 0 18px 40px -22px rgba(28,26,23,0.45); margin: 8px 0 2px; border: 1px solid #0d0f14; }
.term + .term { margin-top: 14px; }
.term-bar { display: flex; align-items: center; gap: 8px; height: 38px; padding: 0 14px; background: var(--term-bar); border-bottom: 1px solid #0d0f14; }
.lights { display: flex; gap: 7px; flex: none; }
.lights i { width: 12px; height: 12px; border-radius: 50%; display: block; }
.lights i:nth-child(1){ background:#FF5F56; } .lights i:nth-child(2){ background:#FEBC2E; } .lights i:nth-child(3){ background:#27C93F; }
.term-bar .cwd { flex: 1; text-align: center; font-family: var(--mono); font-size: 12.5px; color: var(--term-dim); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.term-bar .cwd .ext { color: var(--term-coral); }
.copy { display: inline-flex; align-items: center; gap: 6px; font-family: var(--mono); font-size: 12px; font-weight: 500; color: var(--term-dim); background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.09); padding: 5px 11px; border-radius: 7px; cursor: pointer; transition: all .14s ease; flex: none; }
.copy:hover { color: var(--term-text); border-color: rgba(255,255,255,0.2); }
.copy.done { color: var(--term-green); border-color: rgba(143,191,159,0.4); background: rgba(143,191,159,0.1); }
.copy svg { width: 13px; height: 13px; }
.term-body { padding: 16px 18px; font-family: var(--mono); font-size: 14.5px; line-height: 1.75; color: var(--term-text); overflow-x: auto; }
.term-body.code { line-height: 1.6; font-size: 13.5px; }
.term-body .ln { white-space: pre; }
.term-body .prompt { color: var(--term-coral); user-select: none; }
.term-body .pyprompt { color: var(--term-cyan); user-select: none; }
.term-body .cmd { color: var(--term-text); }
.term-body .flag { color: var(--term-amber); }
.term-body .str { color: var(--term-green); }
.term-body .kw  { color: var(--term-cyan); }
.term-body .com { color: var(--term-dim); font-style: italic; }
.term-body .out { color: var(--term-dim); }
.term-body .ok  { color: var(--term-green); }
.cursor { display: inline-block; width: 8px; height: 1.05em; background: var(--term-coral); vertical-align: -2px; animation: blink 1.05s steps(1) infinite; margin-left: 2px; }
@keyframes blink { 50% { opacity: 0; } }

.gloss { display: flex; gap: 9px; align-items: flex-start; margin: 11px 4px 0; color: var(--muted); font-size: 14.5px; line-height: 1.55; }
.gloss .arr { color: var(--coral); font-family: var(--mono); flex: none; }
.gloss b { color: var(--ink); font-weight: 600; }

/* ---------------- callouts ---------------- */
.callout { display: flex; gap: 12px; margin: 20px 0; padding: 14px 16px; border-radius: 10px; font-size: 14.5px; line-height: 1.55; border: 1px solid var(--line); background: var(--paper-2); }
.callout .ic { flex: none; font-family: var(--mono); font-weight: 600; }
.callout b { color: var(--ink); }
.callout.warn { background: #FBF1E9; border-color: #EAD4BE; }
.callout.warn .ic { color: var(--coral); }
.callout.tip { background: #EEF4EF; border-color: #CFE2D3; }
.callout.tip .ic { color: #3f7d54; }
.callout.info .ic { color: var(--muted); }

/* ---------------- "say this to Claude" card ---------------- */
.say { margin: 18px 0 2px; border: 1px solid #E6CDBF; background: #FBF1EA; border-radius: 12px; overflow: hidden; }
.say-bar { display: flex; align-items: center; gap: 8px; padding: 9px 14px; border-bottom: 1px solid #EFD9CC; font-family: var(--mono); font-size: 12.5px; color: var(--coral); font-weight: 600; }
.say-bar .star { font-size: 13px; }
.say-bar .copy { margin-left: auto; color: var(--coral); background: rgba(203,94,60,0.08); border-color: rgba(203,94,60,0.28); }
.say-bar .copy:hover { color: var(--coral-dk); border-color: var(--coral); }
.say-bar .copy.done { color: #3f7d54; border-color: rgba(143,191,159,0.6); background: rgba(143,191,159,0.16); }
.say-body { padding: 14px 16px; font-size: 16px; color: var(--ink); line-height: 1.5; }
.say-body em { color: var(--ink-soft); }

/* ---------------- mark done / checkpoint ---------------- */
.markdone { display: inline-flex; align-items: center; gap: 9px; margin: 32px 0 0; font: inherit; font-size: 14.5px; color: var(--muted); background: none; border: 1px solid var(--line); padding: 9px 15px; border-radius: 9px; cursor: pointer; transition: all .15s ease; }
.markdone:hover { border-color: var(--coral); color: var(--ink); }
.markdone .box { width: 18px; height: 18px; border: 1.6px solid var(--muted); border-radius: 5px; display: grid; place-items: center; flex: none; }
.markdone.checked { background: var(--coral-soft); border-color: var(--coral); color: var(--coral); }
.markdone.checked .box { background: var(--coral); border-color: var(--coral); }
.markdone .box svg { width: 12px; height: 12px; opacity: 0; }
.markdone.checked .box svg { opacity: 1; }

.checkpoint { margin: 36px 0 0; padding: 18px 20px; border-radius: 12px; background: #EEF4EF; border: 1px solid #CFE2D3; }
.checkpoint h4 { font-family: var(--disp); font-weight: 700; font-size: 17px; margin: 0 0 6px; color: #2f6342; display: flex; align-items: center; gap: 8px; }
.checkpoint p { margin: 0; font-size: 14.5px; color: var(--ink-soft); }

/* ---------------- quiz ---------------- */
.quiz { margin: 44px 0 0; background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 26px 26px 22px; position: relative; box-shadow: 0 14px 36px -28px rgba(28,26,23,0.5); }
.quiz::before { content: ""; position: absolute; left: 0; top: 18px; bottom: 18px; width: 3px; border-radius: 3px; background: var(--coral); }
.quiz .q-eyebrow { font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--coral); font-weight: 600; }
.quiz .q { font-family: var(--disp); font-weight: 600; font-size: 21px; line-height: 1.3; margin: 8px 0 18px; }
.opts { display: grid; gap: 9px; }
.opt { display: flex; align-items: center; gap: 12px; text-align: left; font: inherit; font-size: 15.5px; background: var(--paper); border: 1px solid var(--line); padding: 13px 15px; border-radius: 10px; cursor: pointer; transition: all .13s ease; color: var(--ink); }
.opt:hover:not(:disabled) { border-color: var(--coral); transform: translateX(2px); }
.opt .key { font-family: var(--mono); font-size: 13px; color: var(--muted); border: 1px solid var(--line); border-radius: 5px; width: 24px; height: 24px; display: grid; place-items: center; flex: none; }
.opt:disabled { cursor: default; }
.opt.correct { border-color: var(--term-green); background: #EDF6EF; }
.opt.correct .key { border-color: var(--term-green); color: #3f7d54; background: #fff; }
.opt.wrong { border-color: #E0928A; background: #FBEDEB; }
.opt.wrong .key { border-color: #E0928A; color: #b14b3f; background: #fff; }
@keyframes shake { 0%,100%{transform:translateX(0)} 20%{transform:translateX(-6px)} 40%{transform:translateX(5px)} 60%{transform:translateX(-3px)} 80%{transform:translateX(2px)} }
.opt.shake { animation: shake .4s ease; }
.verdict { margin: 16px 0 0; font-size: 15px; line-height: 1.55; display: none; }
.verdict.show { display: block; }
.verdict.good { color: #3f7d54; }
.verdict.bad { color: #a24a3d; }
.verdict b { font-weight: 600; }
.quiz-foot { display: flex; align-items: center; gap: 16px; margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line); flex-wrap: wrap; }
.btn-next { font: inherit; font-size: 14.5px; font-weight: 500; background: var(--coral); color: #fff; border: none; padding: 10px 18px; border-radius: 9px; cursor: pointer; opacity: 0.4; pointer-events: none; transition: opacity .2s; }
.btn-next.ready { opacity: 1; pointer-events: auto; }
.btn-next:hover { background: var(--coral-dk); }
.skip { font-size: 13.5px; color: var(--muted); border-bottom: 1px dashed var(--line); cursor: pointer; }
.skip:hover { color: var(--ink); border-color: var(--muted); text-decoration: none; }

/* ---------------- start-here cards ---------------- */
.cards { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 22px 0; }
.card { border: 1px solid var(--line); border-radius: 12px; padding: 18px 18px; background: #fff; }
.card h5 { font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--coral); margin: 0 0 10px; font-weight: 600; }
.card ul { margin: 0; padding-left: 18px; font-size: 14.5px; color: var(--ink-soft); }
.card ul li { margin: 6px 0; }
.card ul li b { color: var(--ink); }

/* ---------------- modal overlays (troubleshooting / glossary) ---------------- */
.overlay { position: fixed; inset: 0; z-index: 100; display: none; }
.overlay.open { display: block; }
.overlay .backdrop { position: absolute; inset: 0; background: rgba(28,26,23,0.42); backdrop-filter: blur(2px); }
.overlay .panel { position: absolute; top: 0; right: 0; height: 100%; width: min(560px, 92vw); background: var(--paper); border-left: 1px solid var(--line); box-shadow: -20px 0 60px -30px rgba(0,0,0,0.5); display: flex; flex-direction: column; animation: slidein .22s ease; }
@keyframes slidein { from { transform: translateX(30px); opacity: 0; } to { transform: none; opacity: 1; } }
.overlay .panel header { display: flex; align-items: center; justify-content: space-between; padding: 20px 24px; border-bottom: 1px solid var(--line); }
.overlay .panel header h3 { font-family: var(--disp); font-size: 22px; margin: 0; display: block; }
.overlay .panel header button { font-family: var(--mono); font-size: 13px; color: var(--muted); background: none; border: 1px solid var(--line); border-radius: 8px; padding: 6px 12px; cursor: pointer; }
.overlay .panel header button:hover { color: var(--ink); border-color: var(--muted); }
.overlay .panel .scroll { overflow-y: auto; padding: 8px 24px 40px; }

.trouble { margin: 18px 0 0; }
.trouble dt { font-family: var(--mono); font-size: 14px; font-weight: 600; color: var(--coral); margin-top: 18px; }
.trouble dd { margin: 6px 0 0; font-size: 14.5px; color: var(--ink-soft); }

.glossary dt { font-family: var(--disp); font-weight: 700; font-size: 16px; margin-top: 18px; }
.glossary dd { margin: 4px 0 0; font-size: 14.5px; color: var(--ink-soft); }

/* ---------------- footer ---------------- */
.foot { margin-top: 80px; padding-top: 26px; border-top: 1px solid var(--line); font-size: 13.5px; color: var(--muted); font-family: var(--mono); }
.foot b { color: var(--coral); }

/* ---------------- mobile ---------------- */
.menu-btn { display: none; font: inherit; font-family: var(--mono); font-size: 13px; background: none; border: 1px solid var(--line); border-radius: 8px; padding: 5px 10px; cursor: pointer; color: var(--ink); }
@media (max-width: 880px) {
  .layout { grid-template-columns: 1fr; }
  .rail { position: fixed; top: 52px; left: 0; z-index: 40; width: 280px; background: var(--paper); transform: translateX(-100%); transition: transform .22s ease; box-shadow: 10px 0 40px -20px rgba(0,0,0,0.4); }
  .rail.open { transform: none; }
  .content { padding: 0 22px 120px; }
  .topbar .tag { display: none; }
  .menu-btn { display: inline-block; }
  .cards { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  body { font-size: 16px; }
  .topbar .util button { padding: 5px 7px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; scroll-behavior: auto !important; transition: none !important; }
  .cursor { animation: none !important; }
}