/* ============================================================
   yongjoon.xyz — Kinetic Typography
   Palette: Concrete White #F2F2F2, Concrete Black #1A1A1A,
            Iron Gray #4A4A4A, Signal Red #D64545,
            Phantom Gray #B0B0B0
   ============================================================ */

:root {
  --concrete-white: #F2F2F2;
  --concrete-black: #1A1A1A;
  --iron-gray: #4A4A4A;
  --signal-red: #D64545;
  --phantom-gray: #B0B0B0;
  --gravity-ease: cubic-bezier(0.55, 0, 0.675, 0.19);
  --spring-ease: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html, body {
  background: var(--concrete-white);
  color: var(--concrete-black);
  font-family: 'Space Grotesk', sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: geometricPrecision;
  overflow-x: hidden;
}

body {
  min-height: 100vh;
}

/* ---------- Persistent Act Counter ---------- */
.act-counter {
  position: fixed;
  bottom: 24px;
  right: 32px;
  font-family: 'Instrument Serif', serif;
  font-size: 14px;
  font-weight: 400;
  color: var(--signal-red);
  letter-spacing: 0.02em;
  z-index: 1000;
  pointer-events: none;
  transition: opacity 600ms ease;
}

/* ---------- Common Act Frame ---------- */
.act {
  position: relative;
  width: 100vw;
  height: 120vh;
  overflow: hidden;
  background: var(--concrete-white);
}

.act-label {
  position: absolute;
  top: 32px;
  left: 32px;
  font-family: 'Instrument Serif', serif;
  font-size: 16px;
  letter-spacing: 0.18em;
  color: var(--signal-red);
  text-transform: uppercase;
  z-index: 5;
}

.act-prompt {
  position: absolute;
  bottom: 32px;
  left: 32px;
  font-family: 'Epilogue', sans-serif;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--phantom-gray);
  text-transform: uppercase;
  z-index: 5;
}

/* ============================================================
   ACT I — GRAVITY
   ============================================================ */
.act-gravity {
  display: block;
}

.gravity-stage {
  position: absolute;
  inset: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: center;
  gap: 0 28px;
  padding: 0 6vw 8vh;
}

.gravity-word {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: clamp(72px, 14vw, 200px);
  line-height: 0.85;
  color: var(--concrete-black);
  letter-spacing: -0.02em;
  display: inline-block;
  transform: translateY(-110vh);
  transition: transform 800ms var(--gravity-ease);
  will-change: transform;
}

.gravity-word.dropped {
  transform: translateY(0);
}

.gravity-word:nth-child(odd) {
  font-size: clamp(56px, 11vw, 160px);
}

.gravity-word:nth-child(3n) {
  font-style: italic;
}

/* ============================================================
   ACT II — ORBIT
   ============================================================ */
.act-orbit {
  display: block;
}

.orbit-stage {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  z-index: 2;
}

.orbit-word {
  position: absolute;
  top: 0;
  left: 0;
  font-family: 'Epilogue', sans-serif;
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 36px);
  letter-spacing: -0.01em;
  color: var(--iron-gray);
  white-space: nowrap;
  transform-origin: 0 0;
  will-change: transform;
}

.orbit-word:nth-child(3n) {
  color: var(--concrete-black);
  font-weight: 700;
  font-size: clamp(28px, 3.4vw, 48px);
}

.orbit-word:nth-child(5n) {
  color: var(--signal-red);
}

/* central anchor word */
.orbit-stage::before {
  content: "ORBIT";
  position: absolute;
  top: 0;
  left: 0;
  transform: translate(-50%, -50%);
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: clamp(48px, 7vw, 96px);
  letter-spacing: -0.03em;
  color: var(--concrete-black);
  pointer-events: none;
}

/* ============================================================
   ACT III — MAGNETISM
   ============================================================ */
.act-magnet {
  display: block;
  cursor: crosshair;
}

.magnet-stage {
  position: absolute;
  inset: 0;
}

.magnet-word {
  position: absolute;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: clamp(28px, 3.6vw, 56px);
  letter-spacing: -0.02em;
  color: var(--concrete-black);
  white-space: nowrap;
  pointer-events: none;
  will-change: transform;
}

.magnet-word:nth-child(2n) {
  color: var(--iron-gray);
  font-weight: 400;
  font-family: 'Epilogue', sans-serif;
}

.magnet-word:nth-child(5n) {
  color: var(--signal-red);
}

.magnet-word:nth-child(7n) {
  font-style: italic;
}

/* ============================================================
   ACT IV — DISSOLUTION
   ============================================================ */
.act-dissolve {
  display: block;
}

.dissolve-stage {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 10vw;
}

.dissolve-paragraph {
  font-family: 'DM Sans', sans-serif;
  font-weight: 400;
  font-size: clamp(18px, 2.2vw, 32px);
  line-height: 1.55;
  letter-spacing: -0.005em;
  color: var(--concrete-black);
  text-align: left;
  max-width: 64ch;
}

.dissolve-char {
  display: inline-block;
  transition: transform 3000ms ease-in, opacity 3000ms ease-in;
  will-change: transform, opacity;
}

.dissolve-char.gone {
  opacity: 0;
}

/* ============================================================
   CODA
   ============================================================ */
.act-coda {
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: var(--concrete-white);
}

.coda-mark {
  font-family: 'Instrument Serif', serif;
  font-size: 64px;
  color: var(--signal-red);
  line-height: 0.4;
}

.coda-text {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: clamp(28px, 4vw, 56px);
  letter-spacing: -0.03em;
  color: var(--concrete-black);
}

.coda-sub {
  font-family: 'Instrument Serif', serif;
  font-size: 16px;
  letter-spacing: 0.06em;
  color: var(--iron-gray);
  font-style: italic;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 720px) {
  .gravity-stage {
    gap: 0 16px;
    padding: 0 4vw 6vh;
  }
  .orbit-word {
    font-size: 16px;
  }
  .magnet-word {
    font-size: 22px;
  }
  .dissolve-paragraph {
    font-size: 18px;
    line-height: 1.5;
  }
  .act-counter {
    bottom: 16px;
    right: 16px;
    font-size: 12px;
  }
  .act-label {
    top: 20px;
    left: 20px;
    font-size: 13px;
  }
  .act-prompt {
    bottom: 20px;
    left: 20px;
    font-size: 11px;
  }
}