/* ===== Variables ===== */
:root {
  --bg: #0a0a0f;
  --bg2: #111118;
  --surface: rgba(255,255,255,0.04);
  --border: rgba(255,255,255,0.08);
  --text: #f0f0f5;
  --muted: rgba(240,240,245,0.45);
  --accent-yt: #ff2b2b;
  --accent-x: #e8e8e8;
  --accent-merun: #c084fc;
  --accent-sheet: #4ade80;
  --glow-1: #7c3aed;
  --glow-2: #c084fc;
  --glow-3: #ec4899;
  --font-display: 'Bebas Neue', cursive;
  --font-body: 'Noto Sans JP', sans-serif;
  --radius: 16px;
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-weight: 300;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ===== Noise overlay ===== */
.noise {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 180px 180px;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  height: 100svh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  text-align: center;
}

.hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.28;
  animation: drift 14s ease-in-out infinite alternate;
}
.orb--1 {
  width: 480px; height: 480px;
  top: -120px; left: -100px;
  background: var(--glow-1);
  animation-duration: 16s;
}
.orb--2 {
  width: 360px; height: 360px;
  bottom: -80px; right: -60px;
  background: var(--glow-3);
  animation-duration: 12s;
  animation-delay: -4s;
}
.orb--3 {
  width: 260px; height: 260px;
  top: 40%; left: 55%;
  background: var(--glow-2);
  animation-duration: 18s;
  animation-delay: -8s;
}

@keyframes drift {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(40px, 30px) scale(1.08); }
}

.hero__content {
  position: relative;
  z-index: 1;
  animation: fadeUp 1s ease both;
}

.hero__eyebrow {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: clamp(0.75rem, 1.5vw, 0.9rem);
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(5rem, 18vw, 14rem);
  line-height: 0.9;
  letter-spacing: 0.04em;
  background: linear-gradient(135deg, #fff 30%, var(--glow-2) 70%, var(--glow-3));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__sub {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: clamp(0.8rem, 1.8vw, 1rem);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 1rem;
}

.scroll-hint {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  color: var(--muted);
  font-size: 1.2rem;
  animation: bounce 2.5s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); opacity: 0.5; }
  50%       { transform: translateX(-50%) translateY(8px); opacity: 1; }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===== Sections ===== */
.section {
  position: relative;
  z-index: 1;
  max-width: 680px;
  margin: 0 auto;
  padding: 5rem 1.5rem;
  animation: fadeUp 0.8s ease both;
}

.section__label {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1.8rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.section__label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ===== Cards ===== */
.cards {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.1rem 1.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  transition: background var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity var(--transition);
  border-radius: var(--radius);
}

.card:hover {
  transform: translateX(4px);
  background: rgba(255,255,255,0.07);
}

.card--yt::before    { background: radial-gradient(ellipse at left, rgba(255,43,43,0.12) 0%, transparent 70%); }
.card--x::before     { background: radial-gradient(ellipse at left, rgba(232,232,232,0.08) 0%, transparent 70%); }
.card--merun::before { background: radial-gradient(ellipse at left, rgba(192,132,252,0.12) 0%, transparent 70%); }
.card--sheet::before { background: radial-gradient(ellipse at left, rgba(74,222,128,0.12) 0%, transparent 70%); }

.card:hover::before { opacity: 1; }

.card--yt:hover    { border-color: rgba(255,43,43,0.35);   box-shadow: 0 0 20px rgba(255,43,43,0.08); }
.card--x:hover     { border-color: rgba(232,232,232,0.25); box-shadow: 0 0 20px rgba(232,232,232,0.05); }
.card--merun:hover { border-color: rgba(192,132,252,0.4);  box-shadow: 0 0 20px rgba(192,132,252,0.1); }
.card--sheet:hover { border-color: rgba(74,222,128,0.4);   box-shadow: 0 0 20px rgba(74,222,128,0.08); }

.card__icon {
  flex-shrink: 0;
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,0.06);
  border-radius: 10px;
  position: relative; z-index: 1;
}

.card--yt    .card__icon { color: var(--accent-yt); }
.card--x     .card__icon { color: var(--accent-x); }
.card--merun .card__icon { color: var(--accent-merun); }
.card--sheet .card__icon { color: var(--accent-sheet); }

.card__text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  position: relative; z-index: 1;
}

.card__title {
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

.card__handle {
  font-size: 0.78rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.card__arrow {
  position: relative; z-index: 1;
  color: var(--muted);
  font-size: 1.1rem;
  transition: transform var(--transition), color var(--transition);
}

.card:hover .card__arrow {
  transform: translateX(4px);
  color: var(--text);
}

/* ===== Fan Banner ===== */
.fan-banner {
  margin-bottom: 1.8rem;
  padding: 1.4rem 1.6rem;
  background: linear-gradient(135deg, rgba(192,132,252,0.08), rgba(236,72,153,0.06));
  border: 1px solid rgba(192,132,252,0.2);
  border-radius: var(--radius);
  text-align: center;
}

.fan-banner__name {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: clamp(1.3rem, 4vw, 1.8rem);
  background: linear-gradient(90deg, var(--glow-2), var(--glow-3));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 0.06em;
}

.fan-banner__en {
  font-size: 0.78rem;
  letter-spacing: 0.3em;
  color: var(--muted);
  text-transform: uppercase;
  margin-top: 0.3rem;
}

/* ===== Footer ===== */
.footer {
  position: relative; z-index: 1;
  text-align: center;
  padding: 2rem 1.5rem 3rem;
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  border-top: 1px solid var(--border);
}

/* ===== Responsive ===== */
@media (max-width: 480px) {
  .hero__title { font-size: clamp(5rem, 22vw, 8rem); }
  .section { padding: 3.5rem 1.2rem; }
}