/* 404GIRL — 4 section scroll + canvas frame sequence */

:root {
  --bg: #0a0c10;
  --text: #f4f6fa;
  --muted: rgba(244, 246, 250, 0.72);
  --accent: #6ee7ff;
  --card-border: rgba(255, 255, 255, 0.12);
  --header-h: 64px;
  --font: "DM Sans", system-ui, sans-serif;
  --side-pad: clamp(1.25rem, 4vw, 3rem);
  --indicator-gutter: clamp(2.75rem, 5vw, 4rem);
  --seg-h: 200vh;
  --shadow-text: 0 1px 2px rgba(10, 12, 16, 0.92), 0 2px 4px rgba(10, 12, 16, 0.5);
  --shadow-text-soft: 0 1px 3px rgba(10, 12, 16, 0.85);
  --scroll-progress: 0;
  --snap-eased: 0;
  --snap-velocity: 0;
  --frame-frac: 0;
}

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

html {
  scroll-behavior: auto;
}

html.snap-ready {
  overscroll-behavior: none;
}

body.snap-ready {
  overscroll-behavior-y: none;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-content-wrap {
  box-sizing: border-box;
  width: 100%;
  padding-inline: var(--side-pad);
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: transparent;
  pointer-events: none;
  transition: background 0.8s ease;
}

body.is-logo-compact .site-header {
  background: linear-gradient(180deg, rgba(10, 12, 16, 0.85) 0%, transparent 100%);
}

.site-header__logo {
  position: fixed;
  z-index: 101;
  margin: 0;
  font-weight: 700;
  line-height: 1;
  color: var(--text);
  text-shadow: var(--shadow-text-soft);
  pointer-events: auto;
  transition:
    top 3.2s cubic-bezier(0.33, 1, 0.68, 1),
    left 3.2s cubic-bezier(0.33, 1, 0.68, 1),
    font-size 3.2s cubic-bezier(0.33, 1, 0.68, 1),
    letter-spacing 3.2s cubic-bezier(0.33, 1, 0.68, 1),
    transform 3.2s cubic-bezier(0.33, 1, 0.68, 1);
}

/* Section 01 / 1枚目：左・大きめ */
body.is-logo-hero .site-header__logo {
  top: 50%;
  left: var(--side-pad);
  transform: translateY(-50%);
  font-size: clamp(2.75rem, 11vw, 5.25rem);
  letter-spacing: -0.04em;
}

/* Section 02以降：ヘッダー位置 */
body.is-logo-compact .site-header__logo {
  top: calc(var(--header-h) * 0.5);
  left: var(--side-pad);
  transform: translateY(-50%);
  font-size: 1rem;
  letter-spacing: -0.02em;
}

.section-indicator {
  position: fixed;
  top: 50%;
  right: 0;
  z-index: 100;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  box-sizing: border-box;
  width: var(--indicator-gutter);
  margin: 0;
  padding: 0 0.5rem;
  list-style: none;
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.12em;
  color: var(--muted);
  transform: translateY(-50%);
  pointer-events: none;
}

.section-indicator__item {
  pointer-events: auto;
  line-height: 1;
  transition: color 0.25s ease, opacity 0.25s ease;
}

.section-indicator__item:hover,
.section-indicator__item.is-active {
  color: var(--accent);
}

.section-indicator__item.is-active {
  font-weight: 500;
}

.section-indicator__track {
  position: absolute;
  top: 50%;
  right: 50%;
  width: 1px;
  height: min(52vh, 22rem);
  background: rgba(255, 255, 255, 0.14);
  transform: translate(50%, -50%);
  pointer-events: none;
}

.section-indicator__track-fill {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, var(--accent), #a78bfa);
  transform: scaleY(0);
  transform-origin: top center;
  box-shadow: 0 0 12px rgba(110, 231, 255, 0.45);
  will-change: transform;
}

.scroll-3d {
  position: relative;
  isolation: isolate;
  overflow-x: clip;
}

.scroll-3d__loader {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  background: var(--bg);
  transition: opacity 0.4s ease, visibility 0.4s ease;
}

.scroll-3d__loader.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.scroll-3d__loader-bar {
  width: min(280px, 70vw);
  height: 4px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  overflow: hidden;
}

.scroll-3d__loader-fill {
  display: block;
  height: 100%;
  width: 0%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), #a78bfa);
  transition: width 0.15s ease;
}

.scroll-3d__loader-text {
  margin: 0;
  font-size: 0.875rem;
  color: var(--muted);
}

.scroll-3d__scroll-hint {
  position: fixed;
  left: 50%;
  bottom: clamp(1.5rem, 5vh, 2.5rem);
  z-index: 25;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.65rem;
  color: var(--muted);
  font-size: 0.625rem;
  font-weight: 500;
  letter-spacing: 0.28em;
  pointer-events: none;
  transform: translateX(-50%);
  transition: opacity 0.5s ease, transform 0.5s ease, visibility 0.5s ease;
}

.scroll-3d__scroll-hint.is-hidden {
  opacity: 0;
  visibility: hidden;
  transform: translateX(-50%) translateY(0.75rem);
}

.scroll-3d__scroll-hint-pc,
.scroll-3d__scroll-hint-sp {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.65rem;
}

.scroll-3d__scroll-hint-sp {
  display: none;
}

.scroll-3d__scroll-hint-chevron {
  display: block;
  width: 1px;
  height: 2.5rem;
  background: linear-gradient(180deg, var(--accent), transparent);
  animation: scroll-hint-pulse 1.6s ease-in-out infinite;
}

.scroll-3d__scroll-hint-label--swipe {
  letter-spacing: 0.22em;
}

.scroll-3d__swipeup-host {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.25rem;
  height: 3.25rem;
  min-width: 3.25rem;
  min-height: 3.25rem;
}

.scroll-3d__swipeup-lottie {
  display: block;
  width: 3.25rem;
  height: 3.25rem;
  min-width: 3.25rem;
  min-height: 3.25rem;
  filter: brightness(0) invert(1);
  opacity: 0.95;
  pointer-events: none;
}

.scroll-3d.is-ready .scroll-3d__scroll-hint {
  animation: scroll-hint-fade-in 1s ease 0.6s both;
}

.scroll-3d__scene {
  position: sticky;
  top: 0;
  z-index: 0;
  width: 100vw;
  max-width: 100%;
  height: 100vh;
  margin-left: calc(50% - 50vw);
  pointer-events: none;
}

.scroll-3d.is-snapping .scroll-3d__scene {
  transform: scale(calc(1 + var(--snap-velocity) * 0.045))
    translateY(calc(var(--snap-velocity) * -1.5vh));
  filter: brightness(calc(1 + var(--snap-velocity) * 0.12))
    saturate(calc(1 + var(--snap-velocity) * 0.15));
  will-change: transform, filter;
}

.scroll-3d__canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* FV：フレーム1枚目（frame_0001）のみ黒い透過マスク */
.scroll-3d__mask--intro {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.65s ease;
  background:
    linear-gradient(
      180deg,
      rgba(0, 0, 0, 0.82) 0%,
      rgba(0, 0, 0, 0.68) 45%,
      rgba(0, 0, 0, 0.68) 55%,
      rgba(0, 0, 0, 0.78) 100%
    );
}

.scroll-3d.is-first-frame .scroll-3d__mask--intro {
  opacity: 1;
}

.scroll-3d__vignette {
  position: absolute;
  inset: 0;
  z-index: 2;
  background:
    radial-gradient(ellipse 55% 70% at 50% 45%, transparent 42%, rgba(10, 12, 16, 0.35) 100%),
    linear-gradient(180deg, rgba(10, 12, 16, 0.5) 0%, transparent 18%, transparent 82%, rgba(10, 12, 16, 0.45) 100%);
  pointer-events: none;
}

.scroll-3d__scroll {
  position: relative;
  z-index: 1;
  margin-top: -100vh;
}

.scroll-3d__seg {
  height: var(--seg-h);
}

.scroll-3d__seg--runway {
  pointer-events: none;
}

.scroll-3d__seg-pin {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  width: 100%;
  height: 100vh;
  padding: 0 calc(var(--side-pad) + var(--indicator-gutter)) 0 var(--side-pad);
  pointer-events: none;
}

.scroll-3d__seg-pin--right {
  justify-content: flex-end;
}

.scroll-3d__seg-pin--left {
  justify-content: flex-start;
}

/* Section 04: スクロール最下端・左配置 */
.scroll-3d__finale {
  position: fixed;
  inset: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding: 0 calc(var(--side-pad) + var(--indicator-gutter)) 0 var(--side-pad);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}

.scroll-3d.is-finale-active .scroll-3d__finale {
  opacity: 1;
  visibility: visible;
}

.scroll-3d.is-snapping .scroll-3d__finale {
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

.scroll-3d.is-snapping {
  scroll-snap-type: none;
}

.scroll-3d__block {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  max-width: min(20rem, 34vw);
  text-align: left;
  pointer-events: none;
}

.scroll-3d__block > * {
  opacity: 0;
  transform: translateY(1.35rem);
}

.scroll-3d__block.is-settled > * {
  opacity: 1;
  transform: none;
}

.scroll-3d__block.is-revealed > * {
  opacity: 1;
  transform: none;
  animation: block-reveal-in 0.95s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.scroll-3d__block.is-revealed .scroll-3d__eyebrow {
  animation-delay: 0.04s;
}

.scroll-3d__block.is-revealed .scroll-3d__title {
  animation-delay: 0.12s;
}

.scroll-3d__block.is-revealed .scroll-3d__lead {
  animation-delay: 0.22s;
}

.scroll-3d__block.is-revealed .scroll-3d__cta {
  animation-delay: 0.32s;
}

.scroll-3d.is-snap-down .scroll-3d__block.is-exiting > * {
  animation: block-exit-up 0.55s cubic-bezier(0.55, 0, 1, 0.45) forwards;
}

.scroll-3d.is-snap-down .scroll-3d__block.is-entering > * {
  animation: block-enter-down 0.85s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.scroll-3d.is-snap-up .scroll-3d__block.is-exiting > * {
  animation: block-exit-down 0.55s cubic-bezier(0.55, 0, 1, 0.45) forwards;
}

.scroll-3d.is-snap-up .scroll-3d__block.is-entering > * {
  animation: block-enter-up 0.85s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.scroll-3d.is-snap-down .scroll-3d__block.is-entering .scroll-3d__eyebrow {
  animation-delay: 0.02s;
}

.scroll-3d.is-snap-down .scroll-3d__block.is-entering .scroll-3d__title {
  animation-delay: 0.08s;
}

.scroll-3d.is-snap-down .scroll-3d__block.is-entering .scroll-3d__lead,
.scroll-3d.is-snap-down .scroll-3d__block.is-entering .scroll-3d__cta {
  animation-delay: 0.14s;
}

@keyframes block-reveal-in {
  from {
    opacity: 0;
    transform: translateY(1.35rem);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes block-enter-down {
  from {
    opacity: 0;
    transform: translateY(1.5rem);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes block-enter-up {
  from {
    opacity: 0;
    transform: translateY(-1.5rem);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes block-exit-up {
  to {
    opacity: 0;
    transform: translateY(-1.25rem);
  }
}

@keyframes block-exit-down {
  to {
    opacity: 0;
    transform: translateY(1.25rem);
  }
}

@keyframes scroll-hint-pulse {
  0%,
  100% {
    opacity: 0.35;
    transform: scaleY(0.65);
  }

  50% {
    opacity: 1;
    transform: scaleY(1);
  }
}

@keyframes scroll-hint-fade-in {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(0.5rem);
  }

  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

.scroll-3d__eyebrow {
  margin: 0 0 0.5rem;
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  text-shadow: var(--shadow-text-soft);
}

.scroll-3d__title {
  margin: 0 0 0.65rem;
  font-size: clamp(1.5rem, 3.2vw, 2.25rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  text-wrap: balance;
  text-shadow: var(--shadow-text);
}

/* Section 03 見出し：PC / スマホで改行位置を切り替え */
.scroll-3d__br-pc {
  display: inline;
}

.scroll-3d__br-mobile {
  display: none;
}

.scroll-3d__lead {
  margin: 0;
  font-size: clamp(0.8125rem, 1.6vw, 0.9375rem);
  line-height: 1.55;
  color: var(--muted);
  max-width: 32ch;
  text-shadow: var(--shadow-text-soft);
}

.scroll-3d__cta {
  display: inline-flex;
  margin-top: 1rem;
  padding: 0.65rem 1.15rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: 999px;
  background: rgba(10, 12, 16, 0.45);
  border: 1px solid var(--card-border);
  backdrop-filter: blur(8px);
  pointer-events: auto;
  text-shadow: none;
}

.scroll-3d.is-finale-active .scroll-3d__cta {
  pointer-events: auto;
}

.scroll-3d__cta:hover {
  background: rgba(110, 231, 255, 0.2);
  border-color: rgba(110, 231, 255, 0.4);
}

@media (max-width: 767px) {
  .scroll-3d__block {
    max-width: min(17rem, 78vw);
  }

  :root {
    --indicator-gutter: 2.5rem;
  }

  .section-indicator {
    gap: 0.625rem;
    font-size: 0.6875rem;
  }

  /* ロゴとテキストの被り防止 */
  body.is-logo-hero .site-header__logo {
    top: clamp(4.5rem, 13vh, 6rem);
    left: var(--side-pad);
    transform: none;
    font-size: clamp(1.85rem, 10vw, 2.75rem);
    max-width: 52vw;
  }

  body.is-logo-compact .site-header__logo {
    top: calc(var(--header-h) * 0.5);
    transform: translateY(-50%);
    max-width: none;
  }

  .scroll-3d__seg-pin {
    align-items: center;
    box-sizing: border-box;
    padding-top: clamp(5.5rem, 20vh, 8rem);
    padding-bottom: clamp(2rem, 8vh, 3rem);
  }

  body.is-logo-compact .scroll-3d__seg-pin {
    padding-top: calc(var(--header-h) + 1.25rem);
  }

  /* Section 03: 中央基準のままやや下へ（顔が隠れない位置） */
  .scroll-3d__br-pc {
    display: none;
  }

  .scroll-3d__br-mobile {
    display: inline;
  }

  .scroll-3d__seg--03 .scroll-3d__block {
    transform: translateY(clamp(4rem, 16vh, 7rem));
  }

  .scroll-3d__finale {
    padding-top: calc(var(--header-h) + 1.25rem);
  }

  .scroll-3d__scroll-hint-pc {
    display: none;
  }

  .scroll-3d__scroll-hint-sp {
    display: flex;
  }
}

@media (prefers-reduced-motion: reduce) {
  .scroll-3d__block > * {
    opacity: 1;
    transform: none;
    animation: none !important;
  }

  .scroll-3d__scene {
    transform: none;
    filter: none;
  }

  .scroll-3d__scroll-hint {
    display: none;
  }

  .site-header__logo {
    transition: none;
  }

  html {
    scroll-behavior: auto;
  }

  .scroll-3d__scroll {
    margin-top: 0;
  }

  .scroll-3d__seg {
    height: auto;
    padding: 4rem calc(var(--side-pad) + var(--indicator-gutter)) 4rem var(--side-pad);
  }

  .scroll-3d__seg-pin {
    position: relative;
    top: auto;
    height: auto;
    padding: 0;
  }

  .scroll-3d__finale {
    position: relative;
    inset: auto;
    opacity: 1;
    visibility: visible;
    padding: 4rem calc(var(--side-pad) + var(--indicator-gutter)) 4rem var(--side-pad);
    justify-content: flex-start;
  }
}