/* ────────────────────────────────────────────────
   音のサプリ LP — B 案: 波動・光・粒子(寒色グラデ + 流動)
   v0.1 mock, 2026-05-22 (慧能)
   ──────────────────────────────────────────────── */

:root {
  --c-bg: #0a0a2e;
  --c-bg-2: #0a1a3e;
  --c-bg-3: #1a0a3e;
  --c-fg: #f0f4ff;
  --c-fg-dim: #a0a8d0;
  --c-fg-mute: #5a5f8a;
  --c-line: rgba(180, 190, 240, 0.12);
  --c-accent: #aef0ff;        /* シアン (光の差し色) */
  --c-accent-2: #cfa8ff;      /* ライトパープル */
  --c-glow: rgba(174, 240, 255, 0.5);

  --f-serif: 'Noto Serif JP', serif;
  --f-sans: 'Noto Sans JP', 'Helvetica Neue', sans-serif;
  --f-en: 'Cormorant Garamond', 'Times New Roman', serif;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background:
    linear-gradient(180deg, #0a0a2e 0%, #150a3e 50%, #0a1a3e 100%);
  color: var(--c-fg);
  font-family: var(--f-sans);
  font-weight: 300;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

/* ──────────────────── FV ──────────────────── */

.fv {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6vh 6vw;
  overflow: hidden;
}

.bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.bg-svg {
  width: 110%;
  height: 110%;
  position: absolute;
  top: -5%;
  left: -5%;
}

/* サイン波の流動 */
.wave {
  stroke-dasharray: 800 1600;
  animation: wave-flow 14s linear infinite;
}
.wave-2 { animation-duration: 18s; animation-delay: -3s; }
.wave-3 { animation-duration: 22s; animation-delay: -7s; }

@keyframes wave-flow {
  from { stroke-dashoffset: 0;     }
  to   { stroke-dashoffset: -2400; }
}

/* 光の粒子 — 各点が個別に明滅 + ゆっくり浮遊 */
.p {
  animation: particle-pulse 4s ease-in-out infinite, particle-drift 16s ease-in-out infinite;
  transform-origin: center;
}
.p:nth-child(2)  { animation-delay: -0.5s, -2s; }
.p:nth-child(3)  { animation-delay: -1.0s, -4s; }
.p:nth-child(4)  { animation-delay: -1.5s, -6s; }
.p:nth-child(5)  { animation-delay: -2.0s, -8s; }
.p:nth-child(6)  { animation-delay: -2.5s, -10s; }
.p:nth-child(7)  { animation-delay: -3.0s, -1s; }
.p:nth-child(8)  { animation-delay: -3.5s, -3s; }
.p:nth-child(9)  { animation-delay: -0.3s, -5s; }
.p:nth-child(10) { animation-delay: -1.2s, -7s; }
.p:nth-child(11) { animation-delay: -2.4s, -9s; }
.p:nth-child(12) { animation-delay: -0.8s, -11s; }
.p:nth-child(13) { animation-delay: -1.7s, -13s; }
.p:nth-child(14) { animation-delay: -2.9s, -15s; }
.p:nth-child(15) { animation-delay: -3.2s, -2.5s; }
.p:nth-child(16) { animation-delay: -0.9s, -4.5s; }
.p:nth-child(17) { animation-delay: -2.1s, -6.5s; }
.p:nth-child(18) { animation-delay: -1.4s, -8.5s; }
.p:nth-child(19) { animation-delay: -2.7s, -10.5s; }

@keyframes particle-pulse {
  0%, 100% { opacity: 0.3; transform: scale(0.8); }
  50%      { opacity: 1;   transform: scale(1.4); }
}
@keyframes particle-drift {
  0%   { translate: 0 0; }
  50%  { translate: 12px -8px; }
  100% { translate: -10px 10px; }
}

.fv-inner {
  position: relative;
  z-index: 1;
  max-width: 680px;
  width: 100%;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: clamp(2.5rem, 6vh, 4rem);
  animation: fv-in 1.6s var(--ease) both;
}

@keyframes fv-in {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ロゴ */
.brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
}

.logo {
  font-family: var(--f-en);
  font-weight: 300;
  font-size: clamp(2.8rem, 8vw, 5rem);
  letter-spacing: 0.12em;
  line-height: 1;
  padding-left: 0.12em;
  background: linear-gradient(135deg, #fff 0%, var(--c-accent) 50%, var(--c-accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 40px rgba(174, 240, 255, 0.3);
}

.logo-sub {
  font-family: var(--f-sans);
  font-size: 0.78rem;
  letter-spacing: 0.55em;
  padding-left: 0.55em;
  color: var(--c-fg-dim);
  font-weight: 400;
}

/* コピー本文 */
.fv-body {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.lede {
  font-family: var(--f-serif);
  font-weight: 500;
  font-size: clamp(1.6rem, 4.4vw, 2.4rem);
  letter-spacing: 0.1em;
  line-height: 1.7;
  color: var(--c-fg);
  text-shadow: 0 0 30px rgba(174, 240, 255, 0.2);
}

.message {
  font-family: var(--f-serif);
  font-weight: 300;
  font-size: clamp(0.95rem, 2.2vw, 1.05rem);
  letter-spacing: 0.1em;
  line-height: 2.1;
  color: var(--c-fg-dim);
}

.message-em {
  color: var(--c-fg);
  display: inline-block;
  margin-top: 0.7rem;
}

/* spec */
.spec {
  display: flex;
  justify-content: center;
  gap: clamp(1.5rem, 5vw, 3rem);
  margin-top: 0.5rem;
  flex-wrap: wrap;
  padding: 1.6rem 1rem;
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}

.spec > div {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
}

.spec dt {
  font-family: var(--f-en);
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--c-accent);
}

.spec dd {
  font-family: var(--f-serif);
  font-size: 1rem;
  letter-spacing: 0.05em;
  color: var(--c-fg);
}

/* CTA */
.cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
}

.cta-link {
  font-family: var(--f-sans);
  display: inline-block;
  min-width: 280px;
  padding: 1.1rem 2.2rem;
  letter-spacing: 0.18em;
  font-size: 0.95rem;
  text-align: center;
  position: relative;
  transition: all 0.5s var(--ease);
  cursor: pointer;
  border: 1px solid transparent;
  overflow: hidden;
  border-radius: 2px;
}

.cta-ghost {
  color: var(--c-fg-dim);
  border-color: rgba(180, 190, 240, 0.25);
  background: rgba(255, 255, 255, 0.02);
  backdrop-filter: blur(6px);
}

.cta-ghost:hover {
  color: var(--c-fg);
  border-color: var(--c-accent);
  background: rgba(174, 240, 255, 0.06);
}

.cta-primary {
  color: var(--c-bg);
  background: linear-gradient(135deg, var(--c-accent) 0%, var(--c-accent-2) 100%);
  border-color: transparent;
  font-weight: 500;
  box-shadow:
    0 0 24px rgba(174, 240, 255, 0.35),
    0 8px 24px rgba(123, 77, 214, 0.25);
}

.cta-primary:hover {
  box-shadow:
    0 0 36px rgba(174, 240, 255, 0.55),
    0 12px 32px rgba(123, 77, 214, 0.4);
  transform: translateY(-1px);
}

/* スクロールヒント */
.scroll-hint {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}

.scroll-line {
  display: block;
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, transparent, var(--c-accent));
  animation: scroll-pulse 2.4s ease-in-out infinite;
}

@keyframes scroll-pulse {
  0%, 100% { opacity: 0.2; transform: scaleY(0.7); transform-origin: top; }
  50%      { opacity: 1;   transform: scaleY(1);   transform-origin: top; }
}

/* ──────────────────── 下層 ──────────────────── */

.lower {
  background: linear-gradient(180deg, #0a1a3e 0%, #0a0a2e 100%);
  padding-top: 4rem;
  position: relative;
}

.block {
  max-width: 760px;
  margin: 0 auto;
  padding: 6rem 6vw;
  border-top: 1px solid var(--c-line);
}

.block-title {
  font-family: var(--f-sans);
  font-weight: 500;
  font-size: clamp(1.25rem, 3vw, 1.6rem);
  letter-spacing: 0.18em;
  margin-bottom: 2.5rem;
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  color: var(--c-fg);
}

.title-num {
  font-family: var(--f-en);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  color: var(--c-accent);
  font-weight: 300;
}

.block-text {
  font-family: var(--f-serif);
  color: var(--c-fg);
  font-size: 1rem;
  letter-spacing: 0.06em;
  line-height: 2.1;
  margin-bottom: 1.8rem;
  font-weight: 300;
}

.block-text em {
  font-style: normal;
  background: linear-gradient(135deg, var(--c-accent) 0%, var(--c-accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 500;
}

.block-text strong {
  font-weight: 500;
  color: var(--c-fg);
  border-bottom: 1px solid var(--c-accent);
  padding-bottom: 2px;
}

.block-text-small {
  font-family: var(--f-serif);
  color: var(--c-fg-dim);
  font-size: 0.88rem;
  letter-spacing: 0.05em;
  line-height: 1.9;
  margin-bottom: 2rem;
}

/* プロセス */
.process {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.6rem;
}

.process-item {
  display: flex;
  align-items: flex-start;
  gap: 1.6rem;
  padding: 1.6rem;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--c-line);
  border-radius: 4px;
  transition: border-color 0.4s var(--ease), background 0.4s var(--ease);
}

.process-item:hover {
  border-color: rgba(174, 240, 255, 0.3);
  background: rgba(174, 240, 255, 0.04);
}

.process-num {
  font-family: var(--f-en);
  font-size: 1.8rem;
  letter-spacing: 0.05em;
  background: linear-gradient(135deg, var(--c-accent) 0%, var(--c-accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 400;
  min-width: 3rem;
  line-height: 1;
}

.process-body { flex: 1; }

.process-name {
  font-family: var(--f-sans);
  font-weight: 500;
  font-size: 1.05rem;
  letter-spacing: 0.12em;
  color: var(--c-fg);
  margin-bottom: 0.5rem;
}

.process-text {
  font-family: var(--f-serif);
  color: var(--c-fg-dim);
  font-size: 0.92rem;
  letter-spacing: 0.04em;
  line-height: 1.95;
  font-weight: 300;
}

/* 創り手 */
.makers {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.maker {
  padding: 2rem;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--c-line);
  border-left: 2px solid var(--c-accent);
  border-radius: 4px;
}

.maker-name {
  font-family: var(--f-en);
  font-weight: 400;
  font-size: 2rem;
  letter-spacing: 0.1em;
  color: var(--c-fg);
  margin-bottom: 0.3rem;
}

.maker-role {
  font-family: var(--f-en);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--c-accent);
  margin-bottom: 1.2rem;
  font-style: italic;
}

.maker-bio {
  font-family: var(--f-serif);
  color: var(--c-fg-dim);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  line-height: 2;
  font-weight: 300;
}

/* フォーム */
.apply-form {
  display: flex;
  flex-direction: column;
  gap: 1.6rem;
  margin-top: 1rem;
  padding: 2rem;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--c-line);
  border-radius: 4px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.field-label {
  font-family: var(--f-en);
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--c-accent);
  font-weight: 400;
}

.field input,
.field textarea {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--c-line);
  border-radius: 2px;
  color: var(--c-fg);
  font-family: var(--f-sans);
  font-size: 1rem;
  padding: 0.8rem 1rem;
  outline: none;
  transition: border-color 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

.field input:focus,
.field textarea:focus {
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px rgba(174, 240, 255, 0.12);
}

.field textarea { resize: vertical; min-height: 110px; font-family: var(--f-sans); }

.submit-btn {
  margin-top: 1rem;
  align-self: flex-start;
  min-width: 220px;
  padding: 1.1rem 2.2rem;
  background: linear-gradient(135deg, var(--c-accent) 0%, var(--c-accent-2) 100%);
  border: none;
  color: var(--c-bg);
  font-family: var(--f-sans);
  font-size: 0.95rem;
  letter-spacing: 0.2em;
  cursor: pointer;
  font-weight: 600;
  border-radius: 2px;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
  box-shadow: 0 0 24px rgba(174, 240, 255, 0.3);
}

.submit-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 36px rgba(174, 240, 255, 0.5);
}

/* FAQ */
.faq {
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}

.faq-item {
  padding: 1.4rem 1.6rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--c-line);
  border-radius: 4px;
}

.faq dt {
  font-family: var(--f-sans);
  font-weight: 500;
  font-size: 0.98rem;
  letter-spacing: 0.06em;
  color: var(--c-fg);
  margin-bottom: 0.7rem;
  position: relative;
  padding-left: 1.4rem;
}

.faq dt::before {
  content: "◆";
  position: absolute;
  left: 0;
  color: var(--c-accent);
  font-size: 0.7rem;
  top: 0.3rem;
}

.faq dd {
  font-family: var(--f-serif);
  color: var(--c-fg-dim);
  font-size: 0.92rem;
  letter-spacing: 0.04em;
  line-height: 2;
  padding-left: 1.4rem;
  font-weight: 300;
}

/* 注記 */
.disclaimer {
  max-width: 760px;
  margin: 0 auto;
  padding: 3rem 6vw;
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
  background: rgba(0, 0, 0, 0.2);
}

.disclaimer-text {
  font-family: var(--f-serif);
  color: var(--c-fg-mute);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  line-height: 2;
  text-align: center;
}

/* footer */
.foot {
  max-width: 760px;
  margin: 0 auto;
  padding: 5rem 6vw 4rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  text-align: center;
}

.foot-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
}

.foot-logo {
  font-family: var(--f-en);
  font-size: 1.6rem;
  letter-spacing: 0.2em;
  padding-left: 0.2em;
  background: linear-gradient(135deg, #fff 0%, var(--c-accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.foot-tag {
  font-family: var(--f-sans);
  font-size: 0.7rem;
  letter-spacing: 0.55em;
  padding-left: 0.55em;
  color: var(--c-fg-mute);
}

.foot-meta {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-family: var(--f-sans);
  font-size: 0.82rem;
  color: var(--c-fg-dim);
  letter-spacing: 0.05em;
}

.foot-link {
  border-bottom: 1px solid var(--c-line);
  padding-bottom: 2px;
  transition: border-color 0.4s var(--ease);
}

.foot-link:hover { border-bottom-color: var(--c-accent); }

.foot-mail { color: var(--c-fg-mute); }

.copyright {
  font-family: var(--f-en);
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  color: var(--c-fg-mute);
  margin-top: 1rem;
}

/* ──────────────────── reveal animation ──────────────────── */

.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 1.2s var(--ease), transform 1.2s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ──────────────────── responsive ──────────────────── */

@media (max-width: 600px) {
  .fv { padding: 4vh 5vw; }
  .fv-inner { gap: 2.2rem; }
  .cta-link { min-width: 240px; padding: 1rem 1.5rem; font-size: 0.9rem; }
  .scroll-hint { bottom: 1.5rem; }
  .scroll-line { height: 36px; }
  .block { padding: 4rem 6vw; }
  .block-title { gap: 1rem; margin-bottom: 1.8rem; }
  .process-item { padding: 1.2rem; gap: 1rem; }
  .process-num { font-size: 1.4rem; min-width: 2.5rem; }
  .maker { padding: 1.5rem; }
  .apply-form { padding: 1.4rem; }
  .faq-item { padding: 1.2rem; }
}

@media (prefers-reduced-motion: reduce) {
  .wave, .p { animation: none; }
  .scroll-line { animation: none; opacity: 0.5; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .fv-inner { animation: none; }
}