/* 泣きたい夜もある — Nocturne design-system tokens + page styles.
   Fonts are loaded from Google Fonts, icons from Phosphor (see index.html). */

:root {
  --color-bg: #161826;
  --color-surface: #232532;
  --color-text: #e9e9ed;
  --color-accent: #9184d9;
  --color-accent-2: #a7a1db;
  --color-divider: color-mix(in srgb, #e9e9ed 16%, transparent);

  --color-neutral-100: #f3f5fe;
  --color-neutral-200: #e4e7f5;
  --color-neutral-300: #cfd3e5;
  --color-neutral-400: #b2b6ca;
  --color-neutral-500: #9397ab;
  --color-neutral-600: #75798c;
  --color-neutral-700: #595d6c;
  --color-neutral-800: #3f424d;
  --color-neutral-900: #292b31;

  --color-accent-100: #f5f4ff;
  --color-accent-200: #e7e5fe;
  --color-accent-300: #d2cefd;
  --color-accent-400: #b5abfc;
  --color-accent-500: #968ae0;
  --color-accent-600: #796cbf;
  --color-accent-700: #5d5294;
  --color-accent-800: #423a6a;
  --color-accent-900: #2b2741;

  --font-heading: "Inter", system-ui, sans-serif;
  --font-heading-weight: 500;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mincho: "Shippori Mincho", serif;

  --space-1: 2.8px;
  --space-2: 5.6px;
  --space-3: 8.4px;
  --space-4: 11.2px;
  --space-6: 16.8px;
  --space-8: 22.4px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;

  /* 上端がフェードする区切り線 — Nocturneの signature */
  --fade-rule: linear-gradient(to right, transparent, var(--color-neutral-800) 48px, var(--color-neutral-800) calc(100% - 48px), transparent) 1;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body), "Zen Kaku Gothic New", sans-serif;
  font-size: 15px;
  line-height: 1.55;
  font-weight: 400;
}

a { color: var(--color-accent-300); text-decoration: none; text-underline-offset: 3px; }
a:hover { color: var(--color-accent-200); }
img { display: block; max-width: 100%; }

:focus { outline: none; }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
::selection { background: color-mix(in srgb, var(--color-accent) 30%, transparent); }

.lighten { mix-blend-mode: lighten; background-color: transparent; }

/* — buttons — */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  cursor: pointer; text-decoration: none;
  font-family: inherit; font-weight: var(--font-heading-weight);
  font-size: 14px; line-height: 1.2; color: var(--color-text);
  background: transparent; border: 1px solid transparent;
  padding: var(--space-2) calc(var(--space-3) * 1.2);
  border-radius: var(--radius-md);
}
.btn-primary { color: var(--color-accent); border-color: var(--color-accent); letter-spacing: 0.1em; }
.btn-primary:hover { background: color-mix(in srgb, var(--color-accent) 12%, transparent); color: var(--color-accent); }
.btn-primary:active { background: color-mix(in srgb, var(--color-accent) 22%, transparent); }
.btn-secondary { border-color: var(--color-divider); font-size: 12px; letter-spacing: 0.08em; gap: 6px; }
.btn-secondary:hover { background: color-mix(in srgb, var(--color-text) 7%, transparent); color: var(--color-text); }
.btn-secondary:active { background: color-mix(in srgb, var(--color-text) 14%, transparent); }

/* 下線つきテキストボタン */
.text-btn {
  display: inline-flex; align-items: center; gap: 6px;
  background: transparent; border: none; cursor: pointer;
  font-family: inherit; font-size: 12px; letter-spacing: 0.14em;
  color: var(--color-neutral-400);
  border-bottom: 1px solid var(--color-neutral-800);
  padding: 0 0 3px;
}

/* — hover utilities(元デザインの style-hover 相当) — */
.hov-a:hover { color: var(--color-accent-200); }
.hov-ab:hover { color: var(--color-accent-200); border-bottom-color: var(--color-accent); }
.hov-ring:hover { border-color: var(--color-accent); color: var(--color-accent-200); }

/* — layout — */
.page { min-height: 100vh; display: flex; flex-direction: column; overflow-x: clip; }

/* — nav — */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px clamp(24px, 5vw, 64px);
  background: linear-gradient(to bottom, color-mix(in oklab, var(--color-bg) 72%, transparent), transparent);
}
.brand { font-family: var(--font-mincho); font-weight: 500; font-size: 17px; letter-spacing: 0.22em; white-space: nowrap; }
.nav-links { display: flex; gap: clamp(16px, 3vw, 36px); align-items: center; }
.nav-link { font-size: 12px; letter-spacing: 0.18em; color: var(--color-neutral-300); white-space: nowrap; }
.nav-ig {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border: 1px solid var(--color-neutral-700);
  border-radius: 999px; color: var(--color-neutral-200); font-size: 16px;
}

/* — hero — */
.hero { position: relative; min-height: 92vh; display: flex; align-items: flex-end; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.hero-bg picture { display: contents; }
.hero-img {
  width: 100%; height: 100%; object-fit: cover; object-position: center 30%;
  opacity: 0.6;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,1) 55%, transparent);
  -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,1) 55%, transparent);
}
.star { position: absolute; border-radius: 999px; }
.hero-tategaki {
  position: absolute; top: 120px; right: clamp(24px, 6vw, 72px); margin: 0;
  writing-mode: vertical-rl; font-family: var(--font-mincho);
  font-size: 13px; letter-spacing: 0.42em; color: var(--color-neutral-400);
}
.hero-body {
  position: relative; z-index: 1;
  padding: 0 clamp(24px, 5vw, 64px) clamp(64px, 10vh, 110px);
  display: flex; flex-direction: column; gap: var(--space-6);
  max-width: 680px;
  animation: fadeUp 1.1s ease both;
}
.hero-greeting-row { display: flex; align-items: center; gap: 12px; }
.hero-greeting-line { display: block; width: 28px; height: 1px; background: var(--color-accent); }
.hero-greeting { font-size: 12px; letter-spacing: 0.24em; color: var(--color-accent-300); }
.hero-title {
  font-family: var(--font-mincho); font-weight: 500;
  font-size: clamp(38px, 5.5vw, 60px); line-height: 1.55; letter-spacing: 0.06em;
  margin: 0; text-wrap: pretty;
}
.hero-lead { margin: 0; font-size: 14px; line-height: 2.3; letter-spacing: 0.06em; color: var(--color-neutral-200); text-wrap: pretty; }
.hero-actions { display: flex; gap: var(--space-4); align-items: center; flex-wrap: wrap; }
.hero-sub-link {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; letter-spacing: 0.12em; color: var(--color-neutral-300);
  border-bottom: 1px solid var(--color-neutral-700); padding-bottom: 3px;
}

/* — section common — */
.kicker { font-size: 11px; letter-spacing: 0.32em; color: var(--color-accent-300); }
.section-head { display: flex; flex-direction: column; gap: var(--space-3); align-items: flex-start; }
.section-title { font-family: var(--font-mincho); font-weight: 500; font-size: 24px; letter-spacing: 0.1em; margin: 0; line-height: 1.4; }
.section-rule { display: block; width: 44px; height: 1px; background: linear-gradient(to right, var(--color-accent), transparent); margin-top: var(--space-2); }
.section-note { margin: 0; font-size: 13px; line-height: 2; letter-spacing: 0.06em; color: var(--color-neutral-400); }

/* — tonight — */
.tonight {
  max-width: 1320px; width: 100%; margin: 0 auto;
  padding: clamp(88px, 12vh, 140px) clamp(24px, 5vw, 64px);
  display: grid; grid-template-columns: minmax(140px, 200px) 1fr;
  gap: clamp(32px, 5vw, 72px);
}
.tonight-body { display: flex; flex-direction: column; gap: var(--space-6); align-items: flex-start; }
.tonight-quote {
  margin: 0; font-family: var(--font-mincho); font-weight: 400;
  font-size: clamp(20px, 2.6vw, 28px); line-height: 2.3; letter-spacing: 0.08em;
  color: var(--color-neutral-100); text-wrap: pretty; white-space: pre-line;
}
/* 各行(手動改行区切り)は、収まる限り途中で折り返さない */
.tonight-quote .quote-line { display: block; }
@media (min-width: 1080px) {
  .tonight-quote .quote-line { white-space: nowrap; }
}
.tonight .text-btn { font-size: 12px; letter-spacing: 0.18em; border-bottom-width: 1px; padding-bottom: 4px; }

/* — songs — */
.songs { position: relative; border-top: 1px solid; border-image: var(--fade-rule); }
.songs-inner {
  max-width: 1120px; width: 100%; margin: 0 auto;
  padding: clamp(88px, 12vh, 140px) clamp(24px, 5vw, 64px);
  display: flex; flex-direction: column; gap: clamp(40px, 6vh, 64px);
}
.songs-head { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: var(--space-6); }

.seg {
  display: inline-flex; overflow: hidden; border: 1px solid var(--color-divider); border-radius: var(--radius-md);
  max-width: 100%; overflow-x: auto;
}
.seg button {
  cursor: pointer; background: transparent; border: none;
  font-family: inherit; font-size: 13px; letter-spacing: 0.06em;
  color: var(--color-neutral-300); padding: 7px 14px; white-space: nowrap;
}
.seg button + button { border-left: 1px solid var(--color-divider); }
.seg button:hover { background: color-mix(in srgb, var(--color-text) 7%, transparent); }
.seg button.is-active { color: var(--color-accent); box-shadow: inset 0 0 0 1px var(--color-accent); background: transparent; }

.song-list { display: flex; flex-direction: column; }
.song-row {
  display: grid; grid-template-columns: auto minmax(180px, 300px) 1fr auto;
  gap: clamp(24px, 4vw, 56px); align-items: baseline;
  padding: clamp(28px, 4vh, 40px) 0;
  border-bottom: 1px solid; border-image: var(--fade-rule);
}
.song-jacket {
  width: clamp(88px, 10vw, 128px); height: clamp(88px, 10vw, 128px);
  object-fit: cover; border-radius: var(--radius-md);
  align-self: start;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.45);
}
.song-row.no-jacket { grid-template-columns: minmax(180px, 300px) 1fr auto; }
.song-id { display: flex; flex-direction: column; gap: var(--space-2); }
.song-title { font-family: var(--font-mincho); font-weight: 500; font-size: clamp(22px, 2.4vw, 28px); letter-spacing: 0.08em; margin: 0; }
.song-credit { margin: 0; font-size: 12px; letter-spacing: 0.1em; color: var(--color-neutral-500); }
.song-moods { margin: var(--space-1) 0 0; font-size: 11px; letter-spacing: 0.14em; color: var(--color-accent-300); }
.song-comment { margin: 0; font-size: 14px; line-height: 2.2; letter-spacing: 0.04em; color: var(--color-neutral-200); text-wrap: pretty; max-width: 460px; }
.song-actions { display: flex; flex-direction: column; gap: var(--space-3); align-items: flex-start; }

.songs-empty {
  margin: 0; padding: clamp(28px, 4vh, 40px) 0;
  font-size: 13px; line-height: 2.2; letter-spacing: 0.06em; color: var(--color-neutral-400);
}

/* — lyrics — */
.lyrics[hidden] { display: none; }
.lyrics {
  display: grid; grid-template-columns: minmax(140px, 220px) 1fr;
  gap: clamp(32px, 6vw, 88px);
  animation: fadeUp 0.8s ease both;
}
.lyrics-title { font-family: var(--font-mincho); font-weight: 500; font-size: 20px; letter-spacing: 0.08em; margin: 0; }
.lyrics-credit { margin: 0; font-size: 12px; letter-spacing: 0.08em; color: var(--color-neutral-500); }
.lyrics-columns { columns: 2 300px; column-gap: clamp(40px, 5vw, 72px); }
.lyrics-columns p {
  margin: 0 0 var(--space-6); font-family: var(--font-mincho);
  font-size: 15px; line-height: 2.5; letter-spacing: 0.08em;
  color: var(--color-neutral-100); white-space: pre-line; text-wrap: pretty; break-inside: avoid;
}

/* — about — */
.about { border-top: 1px solid; border-image: var(--fade-rule); }
.about-inner {
  max-width: 1120px; width: 100%; margin: 0 auto;
  padding: clamp(88px, 12vh, 140px) clamp(24px, 5vw, 64px);
  display: grid; grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(40px, 7vw, 96px); align-items: center;
}
.about-text { display: flex; flex-direction: column; gap: var(--space-6); align-items: flex-start; }
.about-p { margin: 0; font-size: 14px; line-height: 2.4; letter-spacing: 0.05em; color: var(--color-neutral-200); text-wrap: pretty; }
.about-follow { letter-spacing: 0.08em; margin-top: var(--space-2); }
.about-operator { margin: var(--space-2) 0 0; font-size: 12px; letter-spacing: 0.1em; color: var(--color-neutral-500); }
.about-operator a { color: var(--color-neutral-300); border-bottom: 1px solid var(--color-neutral-700); padding-bottom: 1px; }
.about-visual { animation: drift 7s ease-in-out infinite alternate; }
.about-img {
  width: 100%; display: block; border-radius: var(--radius-md);
  mask-image: radial-gradient(120% 120% at 50% 40%, rgba(0,0,0,1) 60%, transparent);
  -webkit-mask-image: radial-gradient(120% 120% at 50% 40%, rgba(0,0,0,1) 60%, transparent);
}

/* — footer — */
.site-footer { margin-top: auto; border-top: 1px solid; border-image: var(--fade-rule); }
.footer-inner {
  max-width: 1120px; margin: 0 auto;
  padding: var(--space-8) clamp(24px, 5vw, 64px);
  display: flex; justify-content: space-between; align-items: center;
  gap: var(--space-4); flex-wrap: wrap;
}
.footer-brand { font-family: var(--font-mincho); font-size: 13px; letter-spacing: 0.2em; color: var(--color-neutral-400); }
.footer-note { font-size: 11px; letter-spacing: 0.14em; color: var(--color-neutral-500); }
.footer-link { font-size: 11px; letter-spacing: 0.12em; color: var(--color-neutral-400); display: inline-flex; align-items: center; gap: 6px; }

/* — animations — */
@keyframes drift { from { transform: translateY(0); } to { transform: translateY(-12px); } }
@keyframes twinkle { 0%, 100% { opacity: 0.15; } 50% { opacity: 0.85; } }
@keyframes fadeUp { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: translateY(0); } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-body, .about-visual, .lyrics { animation: none; }
  .star { animation: none !important; }
}

/* — mobile — */
@media (max-width: 820px) {
  .tonight { grid-template-columns: 1fr; gap: var(--space-8); }
  .song-row { grid-template-columns: 1fr; gap: var(--space-6); align-items: start; }
  .song-jacket { width: 128px; height: 128px; }
  .song-actions { flex-direction: row; align-items: center; gap: var(--space-6); }
  .lyrics { grid-template-columns: 1fr; gap: var(--space-8); }
  .about-inner { grid-template-columns: 1fr; }
  .hero-tategaki { display: none; }
}

@media (max-width: 480px) {
  .site-nav { padding-top: 14px; padding-bottom: 14px; gap: 10px; }
  .brand { font-size: 14px; letter-spacing: 0.12em; }
  .nav-links { gap: 12px; }
  .nav-link { font-size: 11px; letter-spacing: 0.08em; }
  .nav-ig { width: 30px; height: 30px; font-size: 14px; }
}