@import url("https://fonts.googleapis.com/css2?family=DM+Sans:opsz,wght@9..40,400;9..40,500;9..40,600;9..40,700&family=DM+Mono:wght@400;500&display=swap");

/* ArchDev brand: night background, violet accent, warm off-white text */
:root {
  --bg: #0a0a0c;
  --fg: #f5f4f0;
  --muted: #a3a3ad;
  --accent: #7c5cff;
  --accent-2: #9fb4ff;
  --ember: #6d4ef0;
  --surface: #121216;
  --surface-2: #1a1a22;
  --line: rgba(255, 255, 255, 0.1);
  --paper: #faf9f5;
  --ink: #191919;
  --low: #21b573;
  --med: #e0a526;
  --high: #f0569b;
  --orange: #ff8a3d;
  --font-display: "DM Sans", ui-sans-serif, system-ui, sans-serif;
  --font-body: "DM Sans", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "DM Mono", ui-monospace, Menlo, monospace;
  --slide-pad: 96px;
  --slide-title-size: 76px;
  --letterbox: #050506;
}

.slide-root {
  position: absolute;
  inset: 0;
  padding: 120px 110px 90px;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  font-family: var(--font-body);
  color: var(--fg);
  background:
    radial-gradient(1200px 520px at 50% -140px, rgba(124, 92, 255, 0.22), transparent 70%),
    var(--bg);
}
.slide-root.plain { background: var(--bg); }
.slide-root.light {
  background: var(--paper);
  color: var(--ink);
}

/* Brand chrome */
.brand {
  position: absolute;
  top: 44px;
  left: 110px;
  right: 110px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 24px;
  color: var(--muted);
}
.brand .mark { display: flex; align-items: center; gap: 12px; color: var(--fg); font-weight: 600; letter-spacing: -0.02em; }
.brand .mark svg { width: 30px; height: 30px; }
.brand .sec { font-family: var(--font-mono); font-size: 20px; letter-spacing: 0.08em; text-transform: uppercase; }
.light .brand .mark { color: var(--ink); }

.kicker {
  font-family: var(--font-mono);
  font-size: 24px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin: 0 0 18px;
}
h1.t {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 76px;
  line-height: 1.04;
  letter-spacing: -0.045em;
  margin: 0 0 22px;
  max-width: 1600px;
  text-wrap: balance;
}
h1.t.xl { font-size: 128px; letter-spacing: -0.05em; }
.lede { font-size: 36px; color: var(--muted); margin: 0 0 30px; max-width: 1400px; line-height: 1.35; text-wrap: pretty; }
.big { font-size: 40px; line-height: 1.35; }
.muted { color: var(--muted); }
.mono { font-family: var(--font-mono); }
.accent { color: var(--accent-2); }
.grow { flex: 1; min-height: 0; }

.row { display: flex; gap: 28px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 30px 32px;
  box-sizing: border-box;
}
.card h3 { font-size: 40px; font-weight: 600; letter-spacing: -0.03em; margin: 0 0 10px; }
.card p { font-size: 30px; color: var(--muted); margin: 0; line-height: 1.4; }
.card .tag { font-family: var(--font-mono); font-size: 20px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 28px;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 999px;
  padding: 10px 22px;
}
.pill { font-family: var(--font-mono); font-size: 22px; background: rgba(124, 92, 255, 0.16); color: var(--accent-2); border-radius: 8px; padding: 4px 12px; }

/* Step indicators (not clickable) */
.tabs { display: flex; gap: 12px; flex-wrap: wrap; }
.tab {
  font: inherit;
  font-size: 28px;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 22px;
}
.tab.on { color: #fff; background: var(--ember); border-color: var(--ember); }

.media {
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #000;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(124, 92, 255, 0.15);
}
.media img, .media video { display: block; width: 100%; height: 100%; object-fit: contain; }
.caption { font-size: 24px; color: var(--muted); margin-top: 14px; }

svg .ax { font-family: var(--font-mono); font-size: 22px; fill: var(--muted); }
svg .lbl { font-family: var(--font-body); font-size: 26px; fill: var(--fg); }
svg .lbl-m { font-family: var(--font-body); font-size: 24px; fill: var(--muted); }

.legend { display: flex; gap: 32px; font-size: 26px; color: var(--muted); margin: 0 0 8px; }
.legend i { display: inline-block; width: 18px; height: 18px; border-radius: 4px; margin-right: 10px; vertical-align: -2px; }

.stat { font-family: var(--font-display); font-weight: 600; font-size: 96px; letter-spacing: -0.04em; line-height: 1; }
.stat-l { font-size: 26px; color: var(--muted); margin-top: 10px; line-height: 1.35; }

.foot { font-size: 22px; color: var(--muted); }
.foot a { color: var(--muted); }
.foot a:focus-visible { outline: 3px solid var(--accent-2); outline-offset: 3px; }

.formula { font-family: var(--font-mono); font-size: 46px; letter-spacing: -0.02em; white-space: nowrap; }

/* Step-through highlight: the current item is lit */
.card.on { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent) inset; background: var(--surface-2); }
.card .more { font-size: 26px; color: var(--muted); margin-top: 8px; line-height: 1.4; }