*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--stage);
  color: var(--ink);
  font-family: 'Roboto', sans-serif;
  line-height: 1.5;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, p { margin: 0; padding: 0; }

:root {
  --stage: #dcd8cd;
  --paper: #faf7f0;
  --ink: #232320;
  --dim: #6b665c;
  --green: #4caf50;
  --green-deep: #388e3c;
  --red: #e5493f;
  --line: rgba(35,35,32,0.14);
}

.kicker { font-family: 'Roboto Mono', monospace; font-size: 0.82rem; letter-spacing: 0.03em; color: var(--green); margin-bottom: 0.9rem; }

.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) { .reveal { transition: none; } }

/* ---------- Nav ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 1.6rem;
  background: rgba(250,247,240,0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav__logo { font-weight: 700; font-size: 1.05rem; }
.nav__logo span { color: var(--dim); font-weight: 400; font-family: 'Roboto Mono', monospace; font-size: 0.85rem; }
.nav__links { display: flex; gap: 1.6rem; }
.nav__links a { font-size: 0.9rem; color: var(--dim); font-weight: 500; }
.nav__links a:hover { color: var(--ink); }
.nav__burger { display: none; flex-direction: column; gap: 4px; background: none; border: 0; cursor: pointer; padding: 6px; }
.nav__burger span { width: 20px; height: 2px; background: var(--ink); display: block; }

/* ---------- Buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; cursor: pointer; font-weight: 700; border-radius: 6px; transition: transform 0.15s, box-shadow 0.15s; }
.btn--pill { font-size: 0.82rem; padding: 0.55rem 1.05rem; background: var(--green); color: #fff; border-radius: 999px; }
.btn--big { font-size: 1rem; padding: 0.9rem 1.7rem; }
.btn--solid { background: var(--green); color: #fff; box-shadow: 0 8px 22px rgba(76,175,80,0.35); }
.btn--solid:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(76,175,80,0.48); background: var(--green-deep); }
.btn--ghost { border: 2px solid var(--ink); color: var(--ink); background: transparent; }
.btn--ghost:hover { background: var(--ink); color: var(--paper); }

/* ---------- Title slides (hero/closer) ---------- */
.slide--title {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: 6rem 1.8rem 3rem;
  overflow: hidden;
  scroll-margin-top: 76px;
}
.slide__bg { position: absolute; inset: 0; background-size: cover; background-position: center; }
.slide__scrim { position: absolute; inset: 0; background: linear-gradient(100deg, rgba(35,35,32,0.85) 0%, rgba(35,35,32,0.55) 45%, rgba(35,35,32,0.2) 75%); }
.slide--title .btn--ghost { background: rgba(250,247,240,0.92); border-color: var(--ink); }
.slide--closer .slide__scrim { background: linear-gradient(100deg, rgba(35,35,32,0.88) 0%, rgba(35,35,32,0.6) 42%, rgba(35,35,32,0.22) 70%), linear-gradient(180deg, rgba(35,35,32,0.15) 0%, rgba(35,35,32,0.75) 78%); }
.slide__num { position: absolute; top: 5.5rem; right: 1.8rem; z-index: 2; font-family: 'Roboto Mono', monospace; font-size: 0.78rem; color: rgba(250,247,240,0.7); }
.slide__content { position: relative; z-index: 2; max-width: 620px; }
.slide__title { font-weight: 900; font-size: clamp(2.4rem, 6vw, 4rem); line-height: 1.05; color: var(--paper); margin-bottom: 1.2rem; }
.slide__sub { font-size: 1.15rem; color: rgba(250,247,240,0.85); max-width: 50ch; margin-bottom: 2rem; }
.slide__cta { display: flex; gap: 1rem; flex-wrap: wrap; }

/* ---------- Deck / card slides ---------- */
.deck { max-width: 1000px; margin: 0 auto; padding: 3rem 1.6rem 3rem; display: flex; flex-direction: column; gap: 2.5rem; }
.slide--card {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 2.6rem 2.2rem 2.2rem;
  box-shadow: 0 20px 50px rgba(35,35,32,0.12);
}
.slide--card .slide__num { position: static; color: var(--dim); margin-bottom: 1.6rem; display: block; }
.slide__grid { display: flex; align-items: center; gap: 2.8rem; }
.slide--reverse .slide__grid { flex-direction: row-reverse; }
.slide__grid img { flex: 0 0 240px; max-width: 240px; }
.slide__text { flex: 1; }
.slide__heading { font-weight: 900; font-size: clamp(1.5rem, 3vw, 2.1rem); color: var(--ink); margin-bottom: 0.9rem; line-height: 1.25; }
.slide__text p { color: var(--dim); font-size: 1.08rem; }

/* ---------- Footer ---------- */
.footer { position: relative; z-index: 2; padding: 2rem 1.8rem; background: var(--paper); border-top: 1px solid var(--line); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.6rem; font-size: 0.85rem; color: var(--dim); }

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
  .nav__links { display: none; }
  .nav__burger { display: flex; }
  .nav__links.is-open { display: flex; position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; background: var(--paper); padding: 1.1rem 1.6rem; gap: 0.9rem; border-bottom: 1px solid var(--line); }

  .slide--title { text-align: center; padding-top: 7.5rem; }
  .slide__content { margin: 0 auto; }
  .slide__cta { justify-content: center; }
  .slide__num { top: auto; bottom: 1.2rem; right: 1.6rem; }

  .slide__grid, .slide--reverse .slide__grid { flex-direction: column; text-align: center; }
  .slide__grid img { flex: 0 0 auto; max-width: 180px; margin: 0 auto; }
  .slide--card { padding: 2rem 1.4rem 1.8rem; }
}