@import url('variables.css');

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
}

#deck {
  width: 100%;
  height: 100%;
  position: relative;
  padding: 1rem 1rem 0;
  display: flex;
  flex-direction: column;
}

#stage { flex: 1; position: relative; min-height: 0; }

.slide {
  position: absolute;
  inset: 0;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 4px 24px rgba(26, 35, 51, 0.06);
  display: flex;
  flex-direction: column;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
  transform: translateX(30px) scale(0.99);
  overflow: hidden;
}

.slide.active {
  opacity: 1;
  pointer-events: all;
  transform: none;
}

.sl-header {
  flex-shrink: 0;
  padding: 1.4rem 2.5rem 1rem;
  border-bottom: 4px solid var(--blue);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
  background: var(--paper);
}

.sl-header-left { display: flex; flex-direction: column; gap: 0.35rem; }

.sl-kicker {
  font-family: var(--mono);
  font-size: var(--fs-kicker);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue);
}

.sl-title {
  font-size: var(--fs-title);
  font-weight: 700;
  color: var(--text);
  line-height: 1.15;
}

.sl-section-num {
  font-family: var(--mono);
  font-size: var(--fs-section-num);
  font-weight: 500;
  color: var(--border2);
  line-height: 1;
  flex-shrink: 0;
}

.sl-content {
  flex: 1;
  overflow: auto;
  padding: 1.5rem 2.5rem;
  display: grid;
  gap: 1.75rem;
}

.cols-2 { grid-template-columns: 1fr 1fr; align-items: start; }
.cols-2-narrow { grid-template-columns: 0.85fr 1.15fr; align-items: start; }
.cols-1 { grid-template-columns: 1fr; }

.sl-footer {
  flex-shrink: 0;
  min-height: 48px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 2.5rem;
  font-family: var(--mono);
  font-size: var(--fs-footer);
  color: var(--faint);
  background: var(--softer);
}

.sl-footer .brand { display: flex; align-items: center; gap: 8px; }
.sl-footer .brand::before {
  content: '';
  width: 10px;
  height: 10px;
  border-radius: 2px;
  background: var(--blue);
}

/* Title slide */
.title-slide-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: 0 4rem;
  position: relative;
  overflow: hidden;
}

.title-deco {
  position: absolute;
  right: -100px;
  top: 50%;
  transform: translateY(-50%);
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--blue-soft) 0%, transparent 70%);
  pointer-events: none;
}

.title-kicker {
  font-family: var(--mono);
  font-size: var(--fs-kicker);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 1.2rem;
  display: flex;
  align-items: center;
  gap: 12px;
}

.title-kicker::before {
  content: '';
  width: 40px;
  height: 3px;
  background: var(--blue);
}

.title-main {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--text);
  max-width: 820px;
  margin-bottom: 1.2rem;
}

.title-main em { font-style: normal; color: var(--blue); }

.title-sub {
  font-size: var(--fs-lead);
  color: var(--muted);
  max-width: 620px;
  line-height: 1.65;
  margin-bottom: 2rem;
}

.title-meta { display: flex; gap: 1rem; flex-wrap: wrap; }

.meta-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--softer);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 16px;
  font-size: var(--fs-small);
  color: var(--muted);
}

.meta-chip b { color: var(--text); font-weight: 600; }

/* Nav */
.deck-nav {
  flex-shrink: 0;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 0.5rem;
}

.deck-nav-left { display: flex; align-items: center; gap: 14px; }
.deck-title { font-size: var(--fs-nav); font-weight: 600; color: var(--text); }

.deck-module {
  font-family: var(--mono);
  font-size: var(--fs-small);
  color: var(--blue);
  background: var(--blue-soft);
  border-radius: 6px;
  padding: 4px 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.deck-nav-right { display: flex; align-items: center; gap: 16px; }
.nav-dots { display: flex; gap: 6px; flex-wrap: wrap; max-width: 280px; }

.nav-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border2);
  cursor: pointer;
  transition: all 0.25s;
}

.nav-dot.on { background: var(--blue); width: 24px; border-radius: 4px; }

.slide-counter {
  font-family: var(--mono);
  font-size: var(--fs-small);
  color: var(--muted);
  min-width: 56px;
  text-align: center;
}

.nav-btns { display: flex; gap: 8px; }

.nav-btn {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  border: 1px solid var(--border2);
  background: var(--paper);
  color: var(--text);
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: 0.15s;
}

.nav-btn:hover:not(:disabled) {
  border-color: var(--blue);
  color: var(--blue);
  background: var(--blue-soft);
}

.nav-btn:disabled { opacity: 0.3; cursor: not-allowed; }
.kbd-hint { font-family: var(--mono); font-size: 0.8rem; color: var(--faint); }

@media (max-width: 900px) {
  .cols-2, .cols-2-narrow { grid-template-columns: 1fr; }
  .sl-header, .sl-content, .sl-footer { padding-left: 1.25rem; padding-right: 1.25rem; }
  .title-slide-content { padding: 0 1.5rem; }
  .nav-dots { display: none; }
  .kbd-hint { display: none; }
}