/* ============================================================================
   slides.css — machinery for "From Coder to Shipper" slide decks.
   Used by slides/base.html. See slides/README.md for how decks work.

   THEMES
   - :root                 = dark (default, matches the rest of the site)
   - html[data-theme=light] = light
   - Code / terminal blocks are intentionally dark in BOTH themes.
   - Never hard-code a colour in a deck; use var(--...).

   LAYOUT
   - One slide at a time: .slide is absolute inset-0; .slide.active is shown.
   - .s-inner = the content column; vertically centred via flex spacers, so
     short slides centre and tall slides scroll instead of clipping.
   - #prog = top progress bar (JS sets width).  .ctl = floating bottom bar.
   ========================================================================== */

:root{
  --bg:#0a0d13; --bg-2:#0d121b;
  --surface:#111724; --surface-2:#151d2c;
  --border:rgba(148,163,184,.14); --border-strong:rgba(148,163,184,.28);
  --text:#e7ecf5; --muted:#9aa8bf; --faint:#6b7790;
  --accent:#34d399; --accent-dim:#10b981; --accent-2:#38bdf8; --accent-3:#a78bfa;
  --warn:#fbbf24;
  --code-bg:#0a0f18; --code-text:#c7d2e4;
  --shadow:0 24px 60px -28px rgba(0,0,0,.7);
  --font:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
html[data-theme="light"]{
  --bg:#f5f7fa; --bg-2:#edf1f7;
  --surface:#ffffff; --surface-2:#f0f4f9;
  --border:rgba(15,23,42,.10); --border-strong:rgba(15,23,42,.22);
  --text:#131a26; --muted:#46536b; --faint:#8a97ad;
  --accent:#059669; --accent-dim:#047857; --accent-2:#0369a1; --accent-3:#6d28d9;
  --warn:#b45309;
  --shadow:0 18px 44px -24px rgba(15,23,42,.28);
}

/* ---------- reset ---------- */
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);
  font-size:16px;line-height:1.5;-webkit-font-smoothing:antialiased;overflow:hidden;
  transition:background .25s,color .25s}
a{color:var(--accent-2);text-decoration:none}
code{font-family:var(--mono);font-size:.9em;background:rgba(56,189,248,.10);
  border:1px solid rgba(56,189,248,.22);color:var(--accent-2);
  padding:.08em .42em;border-radius:6px;white-space:nowrap}
pre code{background:none;border:0;padding:0;white-space:pre;color:var(--code-text);font-size:1em}
::selection{background:rgba(52,211,153,.28)}

/* ---------- progress bar ---------- */
#prog{position:fixed;top:0;left:0;height:3px;width:0;z-index:60;
  background:linear-gradient(90deg,var(--accent),var(--accent-2),var(--accent-3));
  box-shadow:0 0 12px rgba(52,211,153,.45);transition:width .3s ease}

/* ---------- deck / slides ---------- */
.deck{position:fixed;inset:0}
.slide{position:absolute;inset:0;display:none;overflow-y:auto;
  background:radial-gradient(1100px 480px at 82% -10%,rgba(52,211,153,.05),transparent 60%),var(--bg)}
html[data-theme="light"] .slide{
  background:radial-gradient(1100px 480px at 82% -10%,rgba(5,150,105,.06),transparent 60%),var(--bg)}
.slide.active{display:block;animation:slide-in .34s ease both}
@keyframes slide-in{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}

/* content column; ::before/::after spacers centre short slides and collapse
   to 0 when a slide overflows (content then scrolls, nothing clips) */
.s-inner{min-height:100%;max-width:1100px;margin:0 auto;padding:84px 44px 132px;
  display:flex;flex-direction:column}
.s-inner::before,.s-inner::after{content:"";flex:1 0 0}
.s-inner--center{text-align:center;align-items:center}

/* ---------- typography ---------- */
.s-eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--mono);
  font-size:.74rem;letter-spacing:.15em;text-transform:uppercase;color:var(--accent);
  margin:0 0 18px}
.s-eyebrow::before{content:"";width:22px;height:1px;background:var(--accent)}
.s-inner--center .s-eyebrow{justify-content:center}
.s-inner--center .s-eyebrow::before{display:none}
.s-title{font-size:clamp(1.9rem,4.2vw,3rem);line-height:1.14;letter-spacing:-.02em;
  font-weight:800;margin:0 0 14px}
.s-h1{font-size:clamp(2.4rem,6.2vw,4.2rem);line-height:1.05;letter-spacing:-.03em;
  font-weight:800;margin:0 0 18px;max-width:22ch}
.s-sub{color:var(--muted);font-size:clamp(1.02rem,1.7vw,1.22rem);line-height:1.55;
  max-width:62ch;margin:0 0 6px}
.s-inner--center .s-sub{margin-left:auto;margin-right:auto}
.s-cap{color:var(--faint);font-size:.82rem;font-family:var(--mono);margin-top:14px}
.muted{color:var(--muted)}
.faint{color:var(--faint)}
.grad{background:linear-gradient(100deg,var(--accent),var(--accent-2) 60%,var(--accent-3));
  -webkit-background-clip:text;background-clip:text;color:transparent}

/* ---------- title slide ---------- */
.s-brand{font-family:var(--mono);font-size:.92rem;color:var(--faint);margin-bottom:30px}
.s-brand b{color:var(--accent);font-weight:600}
.s-chip{display:inline-block;padding:7px 14px;border:1px solid var(--border-strong);
  border-radius:999px;font-family:var(--mono);font-size:.76rem;letter-spacing:.06em;
  color:var(--muted);margin-bottom:28px}
.s-meta{color:var(--faint);font-size:.88rem;font-family:var(--mono);margin-top:38px}

/* ---------- divider ---------- */
.dv-num{font-family:var(--mono);font-weight:700;line-height:1;
  font-size:clamp(4rem,11vw,8rem);color:transparent;
  -webkit-text-stroke:1.5px var(--border-strong);margin-bottom:8px}

/* ---------- points ---------- */
.pts{display:grid;grid-template-columns:1fr;gap:15px;margin-top:30px}
.pts.cols-2{grid-template-columns:1fr 1fr}
.pts.cols-3{grid-template-columns:repeat(3,1fr)}
.pt{background:var(--surface);border:1px solid var(--border);border-radius:14px;
  padding:20px 22px}
.pt h3{margin:0 0 8px;font-size:1.04rem;font-weight:650;letter-spacing:-.01em}
.pt p{margin:0;color:var(--muted);font-size:.94rem;line-height:1.55}

/* ---------- steps ---------- */
.steps{list-style:none;margin:30px 0 0;padding:0;display:flex;flex-direction:column;gap:18px}
.steps li{display:flex;gap:18px;align-items:flex-start}
.st-n{flex:0 0 auto;width:38px;height:38px;border-radius:50%;display:grid;place-items:center;
  font-family:var(--mono);font-weight:700;font-size:.9rem;color:var(--accent);
  background:var(--surface);border:1px solid var(--border-strong)}
.steps h3{margin:6px 0 4px;font-size:1.05rem;font-weight:650}
.steps p{margin:0;color:var(--muted);font-size:.95rem;line-height:1.55;max-width:64ch}

/* ---------- two columns ---------- */
.cols2{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:30px;align-items:start}
.col{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:22px}
.col h3{margin:0 0 8px;font-size:1.04rem;font-weight:650}
.col p{margin:0;color:var(--muted);font-size:.94rem;line-height:1.55}
.col p+p{margin-top:10px}

/* ---------- code box (always dark) ---------- */
.codebox{margin-top:30px;background:var(--code-bg);border:1px solid var(--border);
  border-radius:14px;overflow:hidden;box-shadow:var(--shadow);max-width:760px}
.cb-bar{display:flex;align-items:center;gap:12px;padding:10px 16px;
  border-bottom:1px solid rgba(148,163,184,.12)}
.dots{display:flex;gap:6px}
.dots i{width:10px;height:10px;border-radius:50%;background:#ff5f57}
.dots i:nth-child(2){background:#febc2e}
.dots i:nth-child(3){background:#28c840}
.cb-fn{font-family:var(--mono);font-size:.74rem;color:#8b98ad}
.codebox pre{margin:0;padding:18px 20px;overflow:auto;max-height:54vh}
.codebox code{font-size:.84rem;line-height:1.6}

/* ---------- terminal (always dark) ---------- */
.term{margin-top:30px;background:var(--code-bg);border:1px solid var(--border);
  border-radius:14px;overflow:hidden;box-shadow:var(--shadow);max-width:820px}
.term-bar{display:flex;align-items:center;gap:12px;padding:10px 16px;
  border-bottom:1px solid rgba(148,163,184,.12)}
.term-title{font-family:var(--mono);font-size:.74rem;color:#8b98ad}
.term-body{padding:18px 20px;font-family:var(--mono);font-size:.86rem;line-height:1.75;
  color:var(--code-text);overflow:auto;max-height:54vh}
.tl{white-space:pre-wrap}
.tp{color:var(--accent-2)}
.tl.ok{color:#34d399}
.tl.err{color:#f87171}
.tl.cm{color:#64748b;font-style:italic}
.tl.hl{color:#a78bfa}

/* ---------- quote ---------- */
.quo{margin:0;font-size:clamp(1.45rem,3.3vw,2.25rem);line-height:1.35;font-weight:650;
  letter-spacing:-.01em;max-width:30ch}
.s-inner--center .quo{margin-left:auto;margin-right:auto}
.quo-by{margin-top:28px;color:var(--faint);font-family:var(--mono);font-size:.88rem}

/* ---------- table ---------- */
.tbl{width:100%;border-collapse:collapse;margin-top:30px;font-size:.96rem}
.tbl th{font-family:var(--mono);font-size:.7rem;letter-spacing:.12em;
  text-transform:uppercase;color:var(--faint);text-align:left;padding:10px 16px;
  border-bottom:1px solid var(--border-strong)}
.tbl td{padding:13px 16px;border-bottom:1px solid var(--border);color:var(--muted);vertical-align:top}
.tbl td:first-child{color:var(--text);font-weight:600}
.tbl tr:last-child td{border-bottom:0}

/* ---------- image ---------- */
.imgbox{margin:30px 0 0;text-align:center}
.imgbox img{max-width:100%;max-height:52vh;object-fit:contain;border-radius:12px;
  border:1px solid var(--border);background:var(--surface)}
.imgbox figcaption{margin-top:14px;color:var(--faint);font-size:.82rem;font-family:var(--mono)}

/* ---------- control bar ---------- */
.ctl{position:fixed;left:50%;bottom:22px;transform:translateX(-50%);z-index:50;
  display:flex;align-items:center;gap:10px;padding:8px 14px;border-radius:999px;
  border:1px solid var(--border);background:var(--surface);box-shadow:var(--shadow);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
.ctl-btn{width:34px;height:34px;border-radius:50%;border:1px solid var(--border-strong);
  background:transparent;color:var(--text);font-size:1rem;cursor:pointer;
  display:grid;place-items:center;padding:0;
  transition:background .15s,color .15s,border-color .15s}
.ctl-btn:hover:not(:disabled){background:var(--accent);border-color:var(--accent);color:#04121c}
.ctl-btn:disabled{opacity:.3;cursor:default}
.ctl-count{font-family:var(--mono);font-size:.8rem;color:var(--muted);min-width:54px;text-align:center}
.ctl-sep{width:1px;height:20px;background:var(--border)}
.ctl-lang{display:flex;gap:4px}
.ctl-lang a{font-family:var(--mono);font-size:.74rem;color:var(--muted);
  padding:6px 9px;border-radius:999px;border:1px solid transparent}
.ctl-lang a.on{color:var(--accent);border-color:var(--border-strong)}

/* ---------- responsive ---------- */
@media (max-width:820px){
  .s-inner{padding:72px 22px 120px}
  .pts.cols-2,.pts.cols-3{grid-template-columns:1fr}
  .cols2{grid-template-columns:1fr}
  .ctl{bottom:14px;gap:8px;padding:6px 10px}
  .ctl-btn{width:30px;height:30px}
}

/* ---------- misc ---------- */
@media (prefers-reduced-motion:reduce){
  .slide.active{animation:none}
  #prog{transition:none}
}
@media print{
  body{overflow:visible;background:#fff}
  .deck{position:static}
  .slide{display:block!important;position:static;background:#fff;
    page-break-after:always}
  #prog,.ctl{display:none}
}