/* ==========================================================================
   Sirius Official Site — style.css
   Apple.com 風のミニマル / ハイテクなデザインシステム
   ========================================================================== */

:root {
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --bg-dark: #000000;
  --bg-dark-alt: #0a0a0c;
  --ink: #1d1d1f;
  --ink-secondary: #6e6e73;
  --ink-invert: #f5f5f7;
  --ink-invert-secondary: #a1a1a6;
  --accent: #2997ff;
  --accent-2: #ff3b6a;
  --gradient: linear-gradient(120deg, #3b82f6, #ff3b6a);
  --line: rgba(0, 0, 0, 0.08);
  --line-invert: rgba(255, 255, 255, 0.14);
  --radius-lg: 28px;
  --radius-md: 18px;
  --nav-h: 44px;
  --ff: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI",
    "Noto Sans JP", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--ff);
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font: inherit; cursor: pointer; }

.section-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-eyebrow {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 8px;
  letter-spacing: 0.01em;
}

.section-title {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 40px;
}

.btn {
  display: inline-block;
  padding: 13px 28px;
  border-radius: 980px;
  font-size: 1rem;
  font-weight: 500;
  transition: transform 0.2s ease, opacity 0.2s ease, background 0.2s ease;
}

.btn-primary {
  background: var(--ink);
  color: #fff;
}

.btn-primary:hover { opacity: 0.82; }

/* ------------------------------- reveal-on-scroll ------------------------------- */

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ---------------------------------- header --------------------------------- */

.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  display: flex;
  align-items: center;
  transition: background 0.3s ease, backdrop-filter 0.3s ease, border-color 0.3s ease;
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom-color: var(--line);
}

.header-inner {
  max-width: 1080px;
  width: 100%;
  height: 100%;
  margin: 0 auto;
  padding: 0 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: #fff;
  transition: color 0.3s ease;
}

.site-header.scrolled .logo { color: var(--ink); }

.nav {
  display: flex;
  gap: 32px;
}

.nav a {
  font-size: 0.82rem;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.92);
  transition: color 0.2s ease, opacity 0.3s ease;
}

.site-header.scrolled .nav a { color: var(--ink-secondary); }
.nav a:hover { color: #fff; }
.site-header.scrolled .nav a:hover { color: var(--ink); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 28px; height: 28px;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  height: 1.5px;
  background: #fff;
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease, background 0.3s ease;
}

.site-header.scrolled .nav-toggle span { background: var(--ink); }

/* ------------------------------------ hero --------------------------------- */

.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  background: #05050a;
}

.hero-media { position: absolute; inset: 0; }

.hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 20%;
}

.hero-media.no-photo { background: radial-gradient(ellipse at 60% 30%, #2a1f45 0%, #0a0a12 60%); }
.hero-media.no-photo .hero-img { display: none; }

.hero-scrim {
  position: absolute;
  inset: 0;
  background: none;
}

/* MCLロゴバッジ: スマホは左上、PCはフォローバーの右横に配置。
   影と透過で背景の写真に馴染むようにする */
.hero-badge {
  position: absolute;
  z-index: 2;
  width: clamp(84px, 24vw, 140px);
  aspect-ratio: 1 / 1;
  object-fit: contain;
  opacity: 0.94;
  filter: drop-shadow(0 6px 18px rgba(0, 0, 0, 0.45)) drop-shadow(0 0 26px rgba(190, 160, 255, 0.3));
  pointer-events: none;
  transform: rotate(-15deg);
  top: 15%;
  left: 6%;
}

@media (min-width: 641px) {
  .hero-badge {
    top: auto;
    left: auto;
    right: 11%;
    bottom: 100px;
    width: clamp(140px, 11vw, 210px);
  }
}

.hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  padding: 0 24px 96px;
  max-width: 1080px;
  margin: 0 auto;
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 40px;
}

.hero-main { max-width: 640px; }

.hero-eyebrow {
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 10px;
}

.hero-title {
  font-size: clamp(3rem, 9vw, 6.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
}

.hero-copy {
  font-size: clamp(1.05rem, 2vw, 1.4rem);
  font-weight: 400;
  color: rgba(255, 255, 255, 0.82);
  margin: 18px 0 32px;
  max-width: 34ch;
}

.hero-copy-break { display: none; }

.hero-content .btn-primary { background: #fff; color: #000; }

.hero-follow {
  align-self: center;
  max-width: 100%;
  display: flex;
  gap: 2px;
  background: rgba(10, 10, 14, 0.45);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 18px;
  padding: 10px;
}

.hero-follow-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  min-width: 64px;
  padding: 10px 10px;
  border-radius: 12px;
  color: #fff;
  text-align: center;
  transition: background 0.2s ease, transform 0.2s ease;
}

.hero-follow-item:hover { background: rgba(255, 255, 255, 0.12); transform: translateY(-2px); }

.hero-follow-icon { width: 18px; height: 18px; }

.hero-follow-name { font-size: 0.68rem; font-weight: 600; }

/* デスクトップ幅ではフォローアイコンを大きく表示する(モバイルはそのままのサイズ) */
@media (min-width: 641px) {
  .hero-follow { gap: 4px; padding: 14px; border-radius: 22px; }
  .hero-follow-item { min-width: 84px; padding: 14px 16px; gap: 10px; }
  .hero-follow-icon { width: 28px; height: 28px; }
  .hero-follow-name { font-size: 0.82rem; }
}

.scroll-cue {
  position: absolute;
  bottom: 32px; left: 50%;
  transform: translateX(-50%);
  width: 22px; height: 36px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 20px;
  z-index: 2;
}

.scroll-cue span {
  position: absolute;
  top: 6px; left: 50%;
  width: 4px; height: 4px;
  margin-left: -2px;
  background: #fff;
  border-radius: 50%;
  animation: cue 1.8s ease-in-out infinite;
}

@keyframes cue {
  0% { opacity: 1; transform: translateY(0); }
  70% { opacity: 0; transform: translateY(14px); }
  100% { opacity: 0; }
}

/* ---------------------------------- release --------------------------------- */

.release {
  padding: 120px 0;
  text-align: center;
  background: var(--bg-dark);
  color: #fff;
}

.release-art {
  width: clamp(140px, 22vw, 220px);
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin: 0 auto 32px;
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.5);
}

.release-label {
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-invert-secondary);
  margin-bottom: 10px;
}

.release-title {
  font-size: clamp(3rem, 9vw, 5.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.release-date {
  color: var(--ink-invert-secondary);
  margin-top: 10px;
  font-size: 1.05rem;
}

.countdown {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin: 48px 0 20px;
  flex-wrap: wrap;
}

.cd-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 84px;
  padding: 20px 10px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--line-invert);
  border-radius: var(--radius-md);
}

.cd-num {
  font-size: 2.4rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.cd-unit {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--ink-invert-secondary);
  text-transform: uppercase;
  margin-top: 6px;
}

.release-note {
  color: var(--ink-invert-secondary);
  font-size: 0.95rem;
}

/* ---------------------------------- profile --------------------------------- */

.profile { padding: 140px 0; background: var(--bg); }

.two-col {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 72px;
  align-items: center;
}

.profile-visual {
  min-width: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.18);
  aspect-ratio: 4 / 5;
  background: var(--bg-alt);
}

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

.profile-body {
  color: var(--ink-secondary);
  font-size: 1.15rem;
  line-height: 1.7;
  max-width: 46ch;
}

.profile-tags {
  display: flex;
  gap: 10px;
  margin-top: 28px;
}

.tag {
  padding: 8px 18px;
  background: var(--bg-alt);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--ink);
}

/* ----------------------------------- music ----------------------------------- */

.music { padding: 140px 0; background: var(--bg-alt); }

.track-grid-hint {
  color: var(--ink-secondary);
  font-size: 0.92rem;
  margin: -24px 0 32px;
  max-width: 56ch;
}

.track-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 22px;
}

.track-card { min-width: 0; }

.track-card a {
  display: block;
  background: var(--bg);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 1px 0 var(--line);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s ease;
}

.track-card a:hover { transform: translateY(-6px); box-shadow: 0 24px 44px rgba(0, 0, 0, 0.14); }

.track-art {
  position: relative;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background: var(--bg-alt);
}

.track-art img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.track-card a:hover .track-art img { transform: scale(1.08); }

.track-art::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.15);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.track-card a:hover .track-art::after { opacity: 1; }

.track-art::before {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  width: 46px; height: 46px;
  margin: -23px 0 0 -23px;
  border-radius: 50%;
  background: #fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M8 5v14l11-7z' fill='%231d1d1f'/%3E%3C/svg%3E") center / 18px no-repeat;
  opacity: 0;
  transform: scale(0.7);
  transition: opacity 0.25s ease, transform 0.25s ease;
  z-index: 1;
}

.track-card a:hover .track-art::before { opacity: 1; transform: scale(1); }

.track-card.is-new .track-info::before {
  content: "NEW";
  display: inline-block;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: #fff;
  background: var(--gradient);
  border-radius: 999px;
  padding: 3px 8px;
  margin-bottom: 6px;
}

.track-info { padding: 14px 16px 16px; }

.track-name { display: block; font-size: 0.95rem; font-weight: 600; letter-spacing: -0.01em; }
.track-meta { display: block; font-size: 0.8rem; color: var(--ink-secondary); margin-top: 3px; }

.track-card.is-disabled .track-art img { filter: grayscale(1); opacity: 0.5; }
.track-card.is-disabled .track-info { padding: 14px 16px 16px; opacity: 0.6; }
.track-card.is-disabled .track-name { color: var(--ink-secondary); }

.music-more { margin-top: 48px; text-align: center; }

/* ----------------------------------- goods ------------------------------------ */

.goods { padding: 140px 0; background: var(--bg-alt); }

.goods-empty {
  padding: 56px;
  text-align: center;
  background: var(--bg);
  border-radius: var(--radius-lg);
  color: var(--ink-secondary);
}

.goods-empty p:first-child { color: var(--ink); font-weight: 500; font-size: 1.05rem; }

.goods-empty-sub {
  color: var(--ink-secondary);
  font-size: 0.92rem;
  margin-top: 8px;
}

/* ---------------------------------- contact ------------------------------------ */

.profile-contact { margin-top: 100px; }

.contact-lead {
  color: var(--ink-secondary);
  font-size: 1.1rem;
  max-width: 52ch;
  margin-bottom: 44px;
}

.contact-dm-card {
  display: flex;
  align-items: center;
  gap: 20px;
  max-width: 480px;
  padding: 24px 28px;
  background: var(--bg-alt);
  border-radius: var(--radius-lg);
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.3s ease;
}

.contact-dm-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.12);
  background: radial-gradient(circle at 30% 110%, #ffdb73, #fd5949 30%, #d6249f 55%, #285aeb 85%);
  color: #fff;
}

.contact-dm-icon { width: 34px; height: 34px; flex-shrink: 0; }

.contact-dm-text { display: flex; flex-direction: column; gap: 2px; }

.contact-dm-title { font-size: 1.05rem; font-weight: 600; }

.contact-dm-handle {
  font-size: 0.88rem;
  color: var(--ink-secondary);
}

.contact-dm-card:hover .contact-dm-handle { color: rgba(255, 255, 255, 0.85); }

.contact-dm-arrow {
  margin-left: auto;
  font-size: 1.3rem;
  transition: transform 0.25s ease;
}

.contact-dm-card:hover .contact-dm-arrow { transform: translateX(6px); }

/* ----------------------------------- footer ------------------------------------ */

.site-footer {
  padding: 48px 0;
  background: var(--bg-alt);
  border-top: 1px solid var(--line);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  text-align: center;
}

.footer-logo {
  font-size: 1rem;
  font-weight: 600;
}

.footer-sns { display: flex; gap: 26px; }

.footer-sns a { color: var(--ink-secondary); font-size: 0.85rem; transition: color 0.2s ease; }
.footer-sns a:hover { color: var(--ink); }

.footer-copy { color: var(--ink-secondary); font-size: 0.78rem; }

/* ------------------------------------ responsive ------------------------------------ */

@media (max-width: 860px) {
  .two-col { grid-template-columns: 1fr; }
  .profile-visual { max-width: 380px; margin: 0 auto; }
}

@media (max-width: 720px) {
  .nav {
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--line);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .nav.is-open { max-height: 320px; }

  .nav a {
    padding: 18px 24px;
    border-bottom: 1px solid var(--line);
    color: var(--ink) !important;
  }

  .nav-toggle { display: flex; }

  .nav-toggle.is-open span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
  .nav-toggle.is-open span:nth-child(2) { opacity: 0; }
  .nav-toggle.is-open span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }
  .nav-toggle.is-open span { background: var(--ink) !important; }
}

@media (max-width: 640px) {
  .hero-follow { overflow-x: auto; }
  .hero-copy-break { display: block; }
}

@media (max-width: 480px) {
  .countdown { gap: 8px; }
  .cd-block { min-width: 68px; padding: 14px 4px; }
  .cd-num { font-size: 1.7rem; }
  .profile, .music, .goods, .release { padding: 96px 0; }
  .profile-contact { margin-top: 72px; }
  .track-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 14px; }
  .hero-follow-item { min-width: 56px; padding: 8px; }
}

/* ------------------------------- music (discography) page ------------------------------- */

.music-page-hero {
  padding: calc(var(--nav-h) + 72px) 0 56px;
  background: var(--bg-alt);
  text-align: center;
}

.music-page-hero .section-eyebrow { justify-content: center; }

.music-page-list { padding: 72px 0 140px; background: var(--bg); }

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--ink-secondary);
  margin-bottom: 24px;
}

.back-link:hover { color: var(--ink); }

/* ------------------------------- track (per-song) page ------------------------------- */

.track-page-header {
  padding: calc(var(--nav-h) + 64px) 0 0;
  text-align: center;
}

.track-page-art {
  width: clamp(180px, 40vw, 280px);
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin: 0 auto 32px;
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.18);
}

.track-page-title {
  font-size: clamp(2rem, 6vw, 3.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.track-page-artist {
  color: var(--ink-secondary);
  font-size: 1.05rem;
  margin-top: 8px;
}

.track-page-date {
  color: var(--ink-secondary);
  font-size: 0.85rem;
  margin-top: 4px;
}

.track-page-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 420px;
  margin: 48px auto 0;
  padding: 0 24px 120px;
}

.track-page-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  background: var(--bg-alt);
  font-weight: 600;
  font-size: 0.98rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.track-page-btn:hover { transform: translateY(-2px); box-shadow: 0 16px 32px rgba(0, 0, 0, 0.12); }

.track-page-btn-icon { width: 22px; height: 22px; flex-shrink: 0; }

.track-page-btn-spotify:hover { background: #1ed760; color: #04250f; }
.track-page-btn-apple:hover { background: linear-gradient(135deg, #fa57c1, #4a17e0); color: #fff; }
.track-page-btn-youtube:hover { background: #ff0000; color: #fff; }
.track-page-btn-line:hover { background: #06c755; color: #fff; }
.track-page-btn-amazon:hover { background: #232f3e; color: #ff9900; }

.track-page-btn-more {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink-secondary);
  font-weight: 500;
  justify-content: center;
}

.track-page-btn-more:hover { background: var(--bg-alt); transform: none; box-shadow: none; color: var(--ink); }