/* ============================================================
   Touch the World, Talk to Code — slide deck styles
   Built on Chan Meng's "Caldera" brand tokens (assets/css/tokens.css)
   ============================================================ */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: var(--font-body-sans);
  font-weight: var(--text-body-weight);
  color: var(--color-ink-primary);
  background-color: var(--color-canvas-page);
  /* Faint printed dot-grid ground — the Caldera "paper" texture */
  background-image: radial-gradient(
    color-mix(in srgb, var(--color-ink-primary) 13%, transparent) 2px,
    transparent 2.2px
  );
  background-size: 22px 22px;
  overflow: hidden;
}

/* ---------- Deck shell ---------- */

.deck {
  position: relative;
  height: 100vh;
  height: 100dvh;
  width: 100%;
  overflow: hidden;
}

/* Progress bar (top) */
.deck__progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 6px;
  width: 0%;
  background: var(--color-accent-primary);
  z-index: 50;
  transition: width var(--duration-base) var(--easing-standard);
}

/* ---------- Slides ---------- */

.slide {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  /* "safe center" keeps the top of tall content reachable when it overflows
     and must scroll, instead of clipping it (graceful fallback to center). */
  justify-content: center;
  justify-content: safe center;
  padding: clamp(16px, min(4.5vw, 5vh), 64px);
  /* Reserve room for the bottom chrome (counter / hint / nav) so content
     never hides behind it. */
  padding-bottom: clamp(60px, 11vh, 96px);
  max-width: var(--container-max);
  margin: 0 auto;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.slide.is-active {
  display: flex;
  animation: slide-in var(--duration-slow) var(--easing-entrance);
}

@keyframes slide-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Eyebrow (orange rule + uppercase label) */
.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 var(--space-3);
  font-family: var(--text-eyebrow-family);
  font-size: var(--text-eyebrow-size);
  font-weight: var(--text-eyebrow-weight);
  letter-spacing: var(--text-eyebrow-tracking);
  text-transform: var(--text-eyebrow-transform);
  color: var(--color-ink-strong);
}

.eyebrow::before {
  content: "";
  display: inline-block;
  width: 28px;
  height: 6px;
  background: var(--color-accent-editorial);
  flex: none;
}

/* Difficulty badge shown in the build-slide eyebrow (Easy / Medium / Challenge) */
.level {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-left: 2px;
  padding: 2px 12px;
  border-radius: 100px;
  background: color-mix(in srgb, var(--color-ink-strong) 9%, transparent);
}
.level .dots {
  font-size: 0.95em;
  line-height: 1;
  letter-spacing: 2px;
  color: var(--color-accent-editorial);
}

/* Headings */
.slide h1,
.slide h2 {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: var(--text-display-tracking);
  line-height: 0.94;
  margin: 0 0 clamp(14px, 2.6vh, 32px);
  color: var(--color-ink-strong);
}

/* min(vw, vh) so headings also shrink on short / landscape viewports,
   not just narrow ones. */
.slide h1 {
  font-size: clamp(38px, min(8.5vw, 12vh), 120px);
}

.slide h2 {
  font-size: clamp(30px, min(6.2vw, 9vh), 80px);
}

.slide .lead {
  font-size: clamp(17px, min(2.4vw, 3.2vh), 28px);
  line-height: 1.45;
  font-weight: 500;
  max-width: 24ch;
  margin: 0 0 clamp(14px, 2.4vh, 32px);
}

.slide p {
  font-size: clamp(16px, min(1.9vw, 2.6vh), 22px);
  line-height: 1.5;
  max-width: 60ch;
  margin: 0 0 clamp(12px, 2vh, 24px);
}

.slide ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: clamp(8px, 1.6vh, 16px);
  max-width: 60ch;
}

.slide li {
  position: relative;
  padding-left: 30px;
  font-size: clamp(16px, min(1.9vw, 2.6vh), 22px);
  line-height: 1.4;
}

.slide li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 14px;
  height: 6px;
  background: var(--color-accent-primary);
}

.highlight {
  color: var(--color-ink-strong);
  background: var(--color-surface-glare);
  padding: 0 6px;
  font-weight: 700;
}

/* ---------- Title slide ---------- */

.slide--title {
  justify-content: center;
}

.slide--title h1 {
  font-size: clamp(44px, min(10vw, 13vh), 140px);
  margin-bottom: clamp(12px, 2vh, 24px);
}

.byline {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: clamp(14px, min(1.8vw, 2.4vh), 20px);
  font-weight: 500;
  flex-wrap: wrap;
}

/* Small event-credit line under the byline */
.credit {
  font-family: var(--font-mono);
  font-size: clamp(12px, min(1.4vw, 1.9vh), 15px);
  color: var(--color-ink-muted);
  margin: 0;
  max-width: 60ch;
}

.byline img {
  width: 44px;
  height: 44px;
}

/* ---------- Cards / panels ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: clamp(10px, 1.4vw, 16px);
  max-width: 980px;
}

.card {
  background: var(--color-canvas-surface);
  border-radius: var(--radius-card);
  padding: clamp(14px, min(2.6vw, 2.6vh), 28px);
}

.card .num {
  font-family: var(--font-display);
  font-size: clamp(22px, min(3.4vw, 4vh), 40px);
  color: var(--color-accent-primary);
  line-height: 1;
  display: block;
  margin-bottom: clamp(2px, 0.8vh, 8px);
}

.card h3 {
  font-family: var(--font-body-sans);
  font-size: clamp(16px, min(1.9vw, 2.4vh), 21px);
  font-weight: 700;
  margin: 0 0 4px;
}

.card p {
  font-size: clamp(13px, min(1.5vw, 2vh), 16px);
  margin: 0;
  line-height: 1.35;
}

.card a {
  color: var(--color-accent-primary);
  text-underline-offset: 2px;
}

/* Flow strip: real world -> signal -> computer -> action */
.flow {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: clamp(8px, 1.2vw, 16px);
  max-width: 1000px;
}

.flow__step {
  flex: 1 1 150px;
  background: var(--color-canvas-surface);
  border-radius: var(--radius-card-sm);
  padding: clamp(12px, min(2vw, 2vh), 22px);
  text-align: center;
  font-weight: 700;
  font-size: clamp(13px, min(1.6vw, 2vh), 18px);
}

.flow__step span {
  display: block;
  font-family: var(--font-display);
  font-weight: 400;
  color: var(--color-accent-primary);
  font-size: clamp(18px, min(2.6vw, 3vh), 30px);
  margin-bottom: 4px;
}

.flow__arrow {
  display: flex;
  align-items: center;
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 40px);
  color: var(--color-ink-strong);
}

/* ---------- Key map ---------- */

.keymap {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(6px, 1vw, 10px);
  max-width: 720px;
  margin-top: clamp(12px, 2vh, 24px);
}

.keycap {
  min-width: 56px;
  padding: 12px 16px;
  text-align: center;
  background: var(--color-canvas-surface);
  border: 2px solid var(--color-ink-strong);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(14px, 1.6vw, 18px);
}

.keycap--accent {
  background: var(--color-accent-primary);
  color: var(--color-on-accent);
  border-color: var(--color-accent-primary);
}

/* ---------- Prompt card (type-along) ---------- */

.prompt {
  background: var(--color-ink-strong);
  color: var(--color-canvas-page);
  border-radius: var(--radius-card);
  padding: clamp(20px, min(3.5vw, 4vh), 48px);
  max-width: 900px;
  font-family: var(--font-mono);
  font-size: clamp(15px, min(2.3vw, 3vh), 28px);
  line-height: 1.5;
}

.prompt .prompt__label {
  display: block;
  font-family: var(--font-body-sans);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-primary);
  margin-bottom: var(--space-2);
}

/* Compact prompt — used on the three build slides, which also carry a heading,
   a one-line description, and a demo button, so the prompt has to take less room. */
.prompt--compact {
  padding: clamp(16px, min(2.8vw, 3vh), 32px);
  font-size: clamp(14px, min(1.9vw, 2.5vh), 22px);
}

/* ---------- Two columns ---------- */

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  max-width: 980px;
}

@media (max-width: 760px) {
  .two-col {
    grid-template-columns: 1fr;
  }
}

/* ---------- Buttons / links ---------- */

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: var(--space-4);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body-sans);
  font-weight: 700;
  font-size: clamp(14px, 1.6vw, 18px);
  text-decoration: none;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  border: 1.5px solid transparent;
  transition: background var(--duration-base) var(--easing-standard),
    color var(--duration-base) var(--easing-standard),
    border-color var(--duration-base) var(--easing-standard),
    transform var(--duration-fast) var(--easing-standard);
}

.btn--primary {
  background: var(--color-accent-primary);
  color: var(--color-ink-strong);
  border-color: var(--color-accent-primary);
}

.btn--primary:hover {
  background: color-mix(in srgb, var(--color-accent-primary) 88%, #000);
}

.btn--ghost {
  background: transparent;
  color: var(--color-ink-strong);
  border-color: var(--color-ink-strong);
}

.btn--ghost:hover {
  background: var(--color-ink-strong);
  color: var(--color-canvas-page);
}

.btn:active {
  transform: translateY(1px);
}

/* ---------- Chrome: counter, nav, hint ---------- */

.deck__counter {
  position: fixed;
  bottom: 22px;
  left: 28px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-ink-muted);
  z-index: 40;
}

.deck__nav {
  position: fixed;
  bottom: 18px;
  right: 24px;
  display: flex;
  gap: 10px;
  z-index: 40;
}

.navbtn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: var(--color-canvas-surface);
  color: var(--color-ink-strong);
  font-size: 22px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--duration-base) var(--easing-standard),
    transform var(--duration-fast) var(--easing-standard);
}

.navbtn:hover {
  background: var(--color-accent-primary);
  color: var(--color-on-accent);
}

.navbtn:active {
  transform: translateY(1px);
}

.deck__hint {
  position: fixed;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-ink-subtle);
  opacity: 0.7;
  z-index: 40;
}

/* ---------- Speaker notes panel ---------- */

.notes {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  max-height: 42vh;
  overflow-y: auto;
  background: var(--color-ink-strong);
  color: var(--color-canvas-page);
  padding: 24px 32px 32px;
  z-index: 60;
  transform: translateY(100%);
  transition: transform var(--duration-base) var(--easing-standard);
  font-size: 16px;
  line-height: 1.55;
}

.notes.is-open {
  transform: translateY(0);
}

.notes__label {
  font-family: var(--font-body-sans);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-primary);
  margin-bottom: 10px;
}

.notes__time {
  font-family: var(--font-mono);
  color: var(--color-surface-glare);
}

/* ---------- Focus ring ---------- */

:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus-ring);
}

/* ---------- Reduced motion ---------- */

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

/* ---------- Small screens ---------- */

@media (max-width: 560px) {
  .deck__hint {
    display: none;
  }
  .flow__arrow {
    transform: rotate(90deg);
  }
  .deck__counter {
    left: 16px;
    bottom: 16px;
  }
  .deck__nav {
    right: 14px;
    bottom: 14px;
  }
  .navbtn {
    width: 42px;
    height: 42px;
    font-size: 19px;
  }
}

/* Short viewports (e.g. projector at 4:3, or landscape phones): hide the
   centre hint so it never collides with content, and tighten the bottom band. */
@media (max-height: 540px) {
  .deck__hint {
    display: none;
  }
  .slide {
    padding-bottom: clamp(64px, 14vh, 84px);
  }
}