/*
 * DANSE PENGUIN MODE — トップページリニューアル（2026-07-02）
 * コンセプト: 透き通った水色と氷。クールな第一印象 → 水中 → ペンギン萌えの部屋、の三段構成。
 * 演出の文法: 「重ねる」— コースティクス（水のゆらぎ光）× 泡 × 氷の結晶グレイン。
 * このCSSは index.html 専用。下層ページは styles.css のまま。
 */

:root {
  --ice-bg: #eaf7fc;
  --ice-bg-2: #d9f0fa;
  --aqua: #7fd4ee;
  --aqua-deep: #2a7fa8;
  --sea-deep: #0e3a5c;
  --sea-abyss: #082438;
  --ink: #17323f;
  --ink-dim: rgba(23, 50, 63, 0.64);
  --white: #ffffff;
  --warm-room: #fdf7f0;
  --warm-accent: #f2b8a0;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--ice-bg);
  color: var(--ink);
  font-family: "Zen Maru Gothic", "Hiragino Maru Gothic ProN", "Yu Gothic", sans-serif;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
}

/* ========== 出現アニメーション ========== */

.rv {
  opacity: 0;
  transform: translateY(26px);
  filter: blur(5px);
  transition:
    opacity 0.95s ease var(--d, 0s),
    transform 0.95s cubic-bezier(0.22, 1, 0.36, 1) var(--d, 0s),
    filter 0.95s ease var(--d, 0s);
  will-change: opacity, transform, filter;
}

.rv.on {
  opacity: 1;
  transform: translateY(0);
  filter: blur(0);
}

/* ========== ヘッダー ========== */

.dp-header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem clamp(1rem, 4vw, 2.5rem);
}

.dp-header__brand {
  font-family: "Inter", sans-serif;
  font-weight: 800;
  letter-spacing: 0.18em;
  font-size: 0.95rem;
  color: var(--ink);
  text-decoration: none;
}

.dp-header__nav {
  display: flex;
  gap: clamp(0.7rem, 2vw, 1.4rem);
  flex-wrap: wrap;
}

.dp-header__nav a {
  font-family: "Inter", sans-serif;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--ink-dim);
  text-decoration: none;
  transition: color 0.2s ease;
}

.dp-header__nav a:hover {
  color: var(--aqua-deep);
}

/* ========== 共通: コースティクス（水のゆらぎ光） ========== */

.caustics {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.5;
  background-image:
    radial-gradient(ellipse 60% 40% at 20% 30%, rgba(255, 255, 255, 0.55) 0%, transparent 55%),
    radial-gradient(ellipse 50% 35% at 70% 60%, rgba(255, 255, 255, 0.4) 0%, transparent 55%),
    radial-gradient(ellipse 45% 30% at 45% 85%, rgba(255, 255, 255, 0.35) 0%, transparent 55%);
  mix-blend-mode: overlay;
  animation: causticsDrift 14s ease-in-out infinite alternate;
}

.caustics--b {
  opacity: 0.35;
  animation-duration: 19s;
  animation-direction: alternate-reverse;
  background-image:
    radial-gradient(ellipse 40% 30% at 80% 20%, rgba(255, 255, 255, 0.5) 0%, transparent 60%),
    radial-gradient(ellipse 55% 40% at 30% 70%, rgba(255, 255, 255, 0.35) 0%, transparent 55%);
}

@keyframes causticsDrift {
  from {
    transform: translate3d(-2.5%, -1.5%, 0) scale(1);
  }
  to {
    transform: translate3d(2.5%, 2%, 0) scale(1.08);
  }
}

/* ========== 共通: 泡 ========== */

.bubbles {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.bubbles span {
  position: absolute;
  bottom: -30px;
  border-radius: 50%;
  background: radial-gradient(circle at 32% 30%, rgba(255, 255, 255, 0.95), rgba(255, 255, 255, 0.15) 60%, transparent 70%);
  border: 1px solid rgba(255, 255, 255, 0.45);
  animation: bubbleRise linear infinite;
  opacity: 0;
}

@keyframes bubbleRise {
  0% {
    transform: translate3d(0, 0, 0) scale(0.8);
    opacity: 0;
  }
  8% {
    opacity: 0.9;
  }
  100% {
    transform: translate3d(var(--sway, 20px), -110vh, 0) scale(1.15);
    opacity: 0;
  }
}

/* ========== 共通: 冷気の霧（LUNEの霧の氷バージョン） ========== */

.mist {
  position: absolute;
  inset: -12% -25%;
  pointer-events: none;
  opacity: 0.5;
  background:
    radial-gradient(ellipse 45% 22% at 22% 68%, rgba(255, 255, 255, 0.75) 0%, transparent 65%),
    radial-gradient(ellipse 55% 26% at 75% 82%, rgba(255, 255, 255, 0.6) 0%, transparent 65%);
  filter: blur(26px);
  animation: mistDrift 26s ease-in-out infinite alternate;
}

.mist--b {
  opacity: 0.35;
  background:
    radial-gradient(ellipse 50% 20% at 60% 55%, rgba(255, 255, 255, 0.65) 0%, transparent 65%),
    radial-gradient(ellipse 40% 24% at 12% 88%, rgba(255, 255, 255, 0.55) 0%, transparent 65%);
  animation-duration: 36s;
  animation-direction: alternate-reverse;
}

@keyframes mistDrift {
  from {
    transform: translate3d(-3%, 0.5%, 0);
  }
  to {
    transform: translate3d(3%, -0.5%, 0);
  }
}

/* ========== Hero: 太陽フレア ========== */

.dp-hero__flare {
  position: absolute;
  top: 17%;
  left: 28%;
  width: 36vmax;
  height: 36vmax;
  transform: translate(-50%, -50%);
  pointer-events: none;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(255, 255, 255, 0.85) 0%,
    rgba(255, 247, 220, 0.3) 28%,
    rgba(127, 212, 238, 0.12) 48%,
    transparent 65%
  );
  mix-blend-mode: screen;
  animation: flarePulse 8s ease-in-out infinite alternate;
}

/* 横に走る光条 */
.dp-hero__flare::before {
  content: "";
  position: absolute;
  top: 48%;
  left: -35%;
  right: -35%;
  height: 4%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.65), transparent);
  filter: blur(7px);
  transform: rotate(-16deg);
}

/* レンズゴースト（小さな環） */
.dp-hero__flare::after {
  content: "";
  position: absolute;
  left: 72%;
  top: 66%;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.4);
  box-shadow: 0 0 18px rgba(255, 255, 255, 0.35);
  filter: blur(0.5px);
}

@keyframes flarePulse {
  from {
    opacity: 0.7;
    transform: translate(-50%, -50%) scale(1);
  }
  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.07);
  }
}

/* ========== ダイヤモンドダスト（冷気のきらめき） ========== */

.sparkles {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.sparkles span {
  position: absolute;
  width: var(--sz, 4px);
  height: var(--sz, 4px);
  background: radial-gradient(circle, rgba(255, 255, 255, 1) 0%, rgba(255, 255, 255, 0.4) 45%, transparent 70%);
  border-radius: 50%;
  opacity: 0;
  animation: twinkleFall var(--dur, 5s) ease-in-out infinite;
  animation-delay: var(--dly, 0s);
}

/* 大きい粒は十字の光条を持つ */
.sparkles span.big::before,
.sparkles span.big::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.85), transparent);
  transform: translate(-50%, -50%);
  width: 400%;
  height: 18%;
}

.sparkles span.big::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

@keyframes twinkleFall {
  0% {
    opacity: 0;
    transform: translateY(-1.5vh) scale(0.4);
  }
  45% {
    opacity: 1;
    transform: translateY(2vh) scale(1);
  }
  100% {
    opacity: 0;
    transform: translateY(6vh) scale(0.35);
  }
}

/* ========== 共通: セクション見出し ========== */

.sec-head {
  max-width: 1160px;
  margin: 0 auto 3.2rem;
  padding: 0 1.5rem;
}

.sec-head__en {
  margin: 0 0 0.5rem;
  font-family: "Inter", sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.5em;
  color: var(--aqua-deep);
}

.sec-head__ja {
  margin: 0;
  font-size: clamp(1.5rem, 3.6vw, 2.2rem);
  font-weight: 700;
  letter-spacing: 0.1em;
}

/* ========== Hero ========== */

.dp-hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  background: linear-gradient(180deg, #f4fbfe 0%, var(--ice-bg) 100%);
}

.dp-hero__bg {
  position: absolute;
  inset: 0;
}

.dp-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  animation: heroIn 16s ease-out both;
}

@keyframes heroIn {
  from {
    transform: scale(1.08);
    opacity: 0;
  }
  25% {
    opacity: 1;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

/* 氷の結晶きらめき（グレイン） */
.dp-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.06;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.95' numOctaves='2'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.7'/%3E%3C/svg%3E");
}

.dp-hero__veil {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(244, 251, 254, 0.15) 0%,
    transparent 40%,
    rgba(234, 247, 252, 0.82) 86%,
    var(--ice-bg) 100%
  );
}

.dp-hero__content {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 1.5rem 13vh;
}

.dp-hero__title {
  margin: 0;
  font-family: "Inter", sans-serif;
  font-weight: 800;
  font-size: clamp(3.6rem, 12vw, 8.5rem);
  letter-spacing: 0.12em;
  line-height: 1;
  color: var(--ink);
  display: flex;
  text-shadow:
    0 0 26px rgba(255, 255, 255, 0.9),
    0 0 70px rgba(127, 212, 238, 0.65);
}

.dp-hero__letter {
  display: inline-block;
  opacity: 0;
  animation: letterIn 1.3s cubic-bezier(0.22, 1, 0.36, 1) both;
  animation-delay: calc(0.5s + var(--i) * 0.13s);
}

@keyframes letterIn {
  from {
    opacity: 0;
    transform: translateY(0.32em);
    filter: blur(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
  }
}

.dp-hero__sub {
  margin: 0.9rem 0 0;
  font-family: "Inter", sans-serif;
  font-weight: 700;
  font-size: clamp(0.85rem, 1.8vw, 1.05rem);
  letter-spacing: 0.55em;
  color: var(--aqua-deep);
  opacity: 0;
  animation: fadeSoft 1.5s ease 1.5s both;
}

.dp-hero__copy {
  margin: 1rem 0 0;
  font-size: clamp(1.05rem, 2.2vw, 1.4rem);
  letter-spacing: 0.22em;
  color: var(--ink);
  opacity: 0;
  animation: fadeSoft 1.5s ease 1.9s both;
}

@keyframes fadeSoft {
  from {
    opacity: 0;
    filter: blur(7px);
  }
  to {
    opacity: 1;
    filter: blur(0);
  }
}

.dp-hero__cue {
  position: absolute;
  bottom: 1.8rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  opacity: 0;
  animation: fadeSoft 1.4s ease 2.8s both;
}

.dp-hero__cue span {
  display: block;
  width: 1px;
  height: 52px;
  background: linear-gradient(180deg, var(--aqua-deep), transparent);
  animation: cueDrop 2.2s ease-in-out infinite;
}

@keyframes cueDrop {
  0% {
    transform: scaleY(0);
    transform-origin: top;
  }
  55% {
    transform: scaleY(1);
    transform-origin: top;
  }
  56% {
    transform-origin: bottom;
  }
  100% {
    transform: scaleY(0);
    transform-origin: bottom;
  }
}

/* ========== 語りかけ ========== */

.dp-intro {
  max-width: 680px;
  margin: 0 auto;
  padding: 18vh 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 3rem;
  text-align: center;
}

.dp-intro p {
  margin: 0;
  font-size: clamp(1.1rem, 2.4vw, 1.5rem);
  letter-spacing: 0.16em;
  line-height: 2.1;
}

.dp-intro p em {
  font-style: normal;
  color: var(--aqua-deep);
  font-weight: 700;
}

/* ========== COOL SIDE ========== */

.dp-cool {
  position: relative;
  padding: 10vh 0 14vh;
}

.dp-cool__grid {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: clamp(1.2rem, 3vw, 2.2rem);
}

.dp-cool__card {
  position: relative;
}

.dp-cool__frame {
  aspect-ratio: 3 / 4;
  overflow: hidden;
  background: var(--ice-bg-2);
  box-shadow: 0 18px 50px rgba(42, 127, 168, 0.18);
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.6s ease;
}

/* 氷の破片ふうの切り抜き3種 */
.dp-cool__card:nth-child(1) .dp-cool__frame {
  clip-path: polygon(0 4%, 96% 0, 100% 94%, 5% 100%);
}

.dp-cool__card:nth-child(2) .dp-cool__frame {
  clip-path: polygon(4% 0, 100% 5%, 95% 100%, 0 96%);
}

.dp-cool__card:nth-child(3) .dp-cool__frame {
  clip-path: polygon(0 0, 100% 3%, 96% 97%, 3% 100%);
}

.dp-cool__card:hover .dp-cool__frame {
  transform: translateY(-8px);
  box-shadow: 0 26px 70px rgba(42, 127, 168, 0.3);
}

.dp-cool__frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 1.1s cubic-bezier(0.22, 1, 0.36, 1);
}

.dp-cool__card:hover .dp-cool__frame img {
  transform: scale(1.05);
}

/* すりガラスキャプション */
.dp-cool__caption {
  position: relative;
  margin: -2.6rem 1rem 0;
  padding: 0.9rem 1.1rem;
  background: rgba(255, 255, 255, 0.55);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.75);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(42, 127, 168, 0.12);
}

.dp-cool__caption .en {
  margin: 0 0 0.25rem;
  font-family: "Inter", sans-serif;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.4em;
  color: var(--aqua-deep);
}

.dp-cool__caption .ja {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  letter-spacing: 0.06em;
}

/* ========== DIVE（水中） ========== */

.dp-dive {
  position: relative;
  color: #eaf7fc;
  background: linear-gradient(
    180deg,
    var(--ice-bg) 0%,
    var(--aqua) 8%,
    var(--aqua-deep) 30%,
    var(--sea-deep) 62%,
    var(--sea-abyss) 100%
  );
  padding: 0 0 16vh;
  overflow: hidden;
}

/* 波の境界 */
.dp-dive__wave {
  display: block;
  width: 100%;
  height: 70px;
  margin-bottom: -1px;
}

.dp-dive .sec-head__en {
  color: var(--aqua);
}

.dp-dive .sec-head__ja {
  color: #f4fbfe;
  text-shadow: 0 0 30px rgba(127, 212, 238, 0.45);
}

.dp-dive__lead {
  max-width: 680px;
  margin: 0 auto 8vh;
  padding: 0 1.5rem;
  text-align: center;
  font-size: clamp(1rem, 2.2vw, 1.3rem);
  letter-spacing: 0.18em;
  line-height: 2.2;
  color: rgba(234, 247, 252, 0.92);
}

.dp-dive__full {
  position: relative;
  margin: 0 0 10vh;
}

.dp-dive__full img {
  width: 100%;
  max-height: 88vh;
  object-fit: cover;
}

.dp-dive__full figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 5rem 1.5rem 2rem;
  background: linear-gradient(180deg, transparent, rgba(8, 36, 56, 0.75));
  font-size: clamp(1.1rem, 2.6vw, 1.6rem);
  letter-spacing: 0.2em;
  text-align: center;
  text-shadow: 0 0 24px rgba(127, 212, 238, 0.7);
}

.dp-dive__duo {
  max-width: 1160px;
  margin: 0 auto 10vh;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: center;
}

.dp-dive__duo--flip {
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
}

.dp-dive__duo--flip .dp-dive__media {
  order: 2;
}

.dp-dive__media {
  position: relative;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 0 60px rgba(127, 212, 238, 0.28);
}

.dp-dive__media--tall {
  aspect-ratio: 3 / 4;
  max-width: 480px;
  margin: 0 auto;
}

.dp-dive__media--round {
  border-radius: 50%;
  aspect-ratio: 1 / 1;
  max-width: 520px;
  margin: 0 auto;
  border: 1px solid rgba(127, 212, 238, 0.5);
  box-shadow:
    0 0 70px rgba(127, 212, 238, 0.4),
    inset 0 0 40px rgba(8, 36, 56, 0.35);
}

.dp-dive__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.dp-dive__text .en {
  margin: 0 0 0.8rem;
  font-family: "Inter", sans-serif;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.5em;
  color: var(--aqua);
}

.dp-dive__text h3 {
  margin: 0 0 1.2rem;
  font-size: clamp(1.3rem, 2.8vw, 1.9rem);
  letter-spacing: 0.12em;
  line-height: 1.8;
  color: #f4fbfe;
  text-shadow: 0 0 26px rgba(127, 212, 238, 0.5);
}

.dp-dive__text p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 2.1;
  letter-spacing: 0.06em;
  color: rgba(234, 247, 252, 0.78);
  max-width: 38ch;
}

/* ========== THE GAP（部屋） ========== */

.dp-gap {
  position: relative;
  background: linear-gradient(180deg, var(--sea-abyss) 0%, var(--warm-room) 14%, var(--warm-room) 100%);
  padding: 20vh 0 12vh;
}

.dp-gap .sec-head {
  text-align: center;
}

.dp-gap .sec-head__en {
  color: var(--warm-accent);
}

.dp-gap__note {
  display: block;
  margin: 0.8rem auto 0;
  font-size: 0.95rem;
  letter-spacing: 0.3em;
  color: var(--ink-dim);
}

.dp-gap__main {
  max-width: 1060px;
  margin: 0 auto 3rem;
  padding: 0 1.5rem;
}

.dp-gap__main figure {
  margin: 0;
  border-radius: 26px;
  overflow: hidden;
  box-shadow: 0 24px 70px rgba(180, 130, 100, 0.22);
}

.dp-gap__main img {
  width: 100%;
}

.dp-gap__main figcaption {
  padding: 1.2rem 0 0;
  text-align: center;
  font-size: clamp(1.05rem, 2.4vw, 1.4rem);
  letter-spacing: 0.18em;
}

.dp-gap__grid {
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: clamp(1.2rem, 3vw, 2rem);
  align-items: start;
}

.dp-gap__card {
  margin: 0;
}

.dp-gap__card .ph {
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 14px 40px rgba(180, 130, 100, 0.18);
  transition: transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

.dp-gap__card:hover .ph {
  transform: translateY(-6px) rotate(-0.6deg);
}

.dp-gap__card img {
  width: 100%;
}

.dp-gap__card figcaption {
  padding: 0.9rem 0.4rem 0;
  font-size: 0.9rem;
  line-height: 1.9;
  letter-spacing: 0.06em;
  color: var(--ink-dim);
}

/* ========== DETAILS ========== */

.dp-details {
  background: var(--warm-room);
  padding: 12vh 0 14vh;
}

.dp-details__grid {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: clamp(1.2rem, 3vw, 2.4rem);
}

.dp-detail {
  text-align: center;
}

.dp-detail__img {
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  overflow: hidden;
  max-width: 230px;
  margin: 0 auto 1.1rem;
  border: 1px solid rgba(127, 212, 238, 0.6);
  box-shadow: 0 0 34px rgba(127, 212, 238, 0.3);
  transition: box-shadow 0.5s ease;
}

.dp-detail:hover .dp-detail__img {
  box-shadow: 0 0 60px rgba(127, 212, 238, 0.55);
}

.dp-detail__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
}

.dp-detail:hover .dp-detail__img img {
  transform: scale(1.09);
}

.dp-detail h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  letter-spacing: 0.12em;
}

.dp-detail p {
  margin: 0 auto;
  font-size: 0.85rem;
  line-height: 1.95;
  letter-spacing: 0.04em;
  color: var(--ink-dim);
  max-width: 26ch;
}

/* ========== CLOSING ========== */

.dp-closing {
  position: relative;
  background: linear-gradient(180deg, var(--warm-room) 0%, var(--ice-bg) 30%, #f4fbfe 100%);
  padding: 16vh 1.5rem 12vh;
  text-align: center;
  overflow: hidden;
}

.dp-closing__glow {
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translate(-50%, -30%);
  width: 65vmax;
  height: 65vmax;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(127, 212, 238, 0.35) 0%, rgba(127, 212, 238, 0.12) 40%, transparent 70%);
  animation: glowBreath 7s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes glowBreath {
  from {
    opacity: 0.75;
    transform: translate(-50%, -30%) scale(1);
  }
  to {
    opacity: 1;
    transform: translate(-50%, -30%) scale(1.06);
  }
}

.dp-closing__frame {
  position: relative;
  display: inline-block;
  max-width: min(400px, 78vw);
  border-radius: 50% 50% 46% 46% / 58% 58% 40% 40%;
  overflow: hidden;
  box-shadow:
    0 0 50px rgba(127, 212, 238, 0.5),
    0 0 140px rgba(127, 212, 238, 0.25);
}

.dp-closing__frame img {
  width: 100%;
}

.dp-closing__copy {
  position: relative;
  margin: 3rem 0 0;
  font-size: clamp(1.2rem, 2.8vw, 1.7rem);
  letter-spacing: 0.22em;
}

.dp-closing__links {
  position: relative;
  margin: 3rem auto 0;
  max-width: 760px;
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.dp-closing__links a {
  font-family: "Inter", sans-serif;
  font-size: 0.85rem;
  letter-spacing: 0.16em;
  color: var(--ink);
  text-decoration: none;
  padding: 0.75rem 1.6rem;
  border: 1px solid var(--aqua-deep);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(6px);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.dp-closing__links a:hover {
  background: rgba(127, 212, 238, 0.35);
  box-shadow: 0 0 26px rgba(127, 212, 238, 0.5);
}

/* ========== フッター ========== */

.dp-footer {
  background: var(--sea-deep);
  color: rgba(234, 247, 252, 0.75);
  text-align: center;
  padding: 2.2rem 1.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
}

.dp-footer a {
  color: #eaf7fc;
}

/* ========== レスポンシブ ========== */

@media (max-width: 820px) {
  .dp-dive__duo,
  .dp-dive__duo--flip {
    grid-template-columns: 1fr;
  }

  .dp-dive__duo--flip .dp-dive__media {
    order: 0;
  }

  .dp-header__nav {
    display: none;
  }
}

/* ========== reduced motion ========== */

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

  .rv,
  .dp-hero__letter,
  .dp-hero__sub,
  .dp-hero__copy,
  .dp-hero__cue {
    opacity: 1;
    transform: none;
    filter: none;
  }
}