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

:root {
  --bg: #0a0a0c;
  --surface: #141417;
  --hover: #1e1e23;
  --border: #26262c;
  --text: #f4f4f5;
  --muted: #9f9fa8;
  --faint: #6b6b74;
  --accent: #34d399;
  --font: ui-sans-serif, system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif;
}

html {
  max-width: 100%;
  overflow-x: hidden;
  color-scheme: dark;
}

body {
  max-width: 100%;
  min-height: 100vh;
  overflow-x: hidden;
  padding-bottom: 100px;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.5;
}

[hidden] { display: none !important; }
button, input, select { font: inherit; }
button { border: 0; color: inherit; cursor: pointer; }

.app {
  display: flex;
  min-width: 0;
  min-height: 100vh;
}

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 5;
  display: flex;
  width: 56px;
  flex-direction: column;
  border-right: 1px solid var(--border);
  background: var(--surface);
  padding: 16px 8px;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  margin: 0 auto 26px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--bg);
  font-size: 18px;
  font-weight: 800;
  text-decoration: none;
}

.brand { display: none; }
.nav { display: flex; flex-direction: column; gap: 4px; }

.nav-item {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 11px;
  border-radius: 8px;
  padding: 9px 8px;
  color: var(--muted);
  font-size: 0.84rem;
  text-decoration: none;
  transition: 0.15s;
}

.nav-item:hover { background: var(--surface); color: var(--text); }
.nav-item.active { background: var(--hover); color: var(--text); font-weight: 700; }
.nav-item svg { width: 18px; height: 18px; flex: none; }

.user-area { margin-top: auto; }
.user {
  display: none;
  overflow: hidden;
  color: var(--faint);
  font-size: 0.7rem;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.logout {
  display: none;
  margin-top: 7px;
  background: transparent;
  color: var(--faint);
  font-size: 0.68rem;
}
.logout:hover { color: var(--accent); }

.main {
  width: calc(100% - 56px);
  min-width: 0;
  margin-left: 56px;
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: 1160px;
  min-width: 0;
  margin: 0 auto;
  padding: 38px 28px 54px;
}

header { padding: 6px 0 28px; }
h1 { font-size: 1.65rem; letter-spacing: 0.02em; }
header p { margin-top: 6px; color: var(--muted); font-size: 0.84rem; }

.controls {
  display: flex;
  width: 100%;
  min-width: 0;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 18px;
}
.controls > * { min-width: 0; max-width: 100%; }

.search {
  position: relative;
  min-width: 0;
  max-width: 100%;
  flex: 1 1 220px;
}

.search input {
  width: 100%;
  min-width: 0;
  max-width: 100%;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 9px;
  outline: 0;
  background: var(--surface);
  color: var(--text);
  padding: 0 13px;
}
.search input { padding-left: 40px; }
.search input:focus { border-color: var(--accent); }
.search svg { position: absolute; left: 13px; top: 12px; color: var(--muted); }

#searchButton {
  height: 42px;
  padding: 0 20px;
  border-radius: 9px;
  background: var(--accent);
  color: var(--bg);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  flex: 0 0 auto;
}
#searchButton:hover { filter: brightness(1.08); }

.filter {
  position: relative;
  min-width: 0;
  max-width: 100%;
  flex: 1 1 180px;
}
.filter-trigger {
  position: relative;
  width: 100%;
  min-width: 0;
  max-width: 100%;
  height: 42px;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 9px;
  outline: 0;
  background: var(--surface);
  color: var(--text);
  padding: 0 34px 0 13px;
  text-align: left;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.filter-trigger::after {
  position: absolute;
  top: 50%;
  right: 13px;
  color: var(--muted);
  content: "▾";
  transform: translateY(-50%);
}
.filter-trigger:focus, .filter:focus-within .filter-trigger { border-color: var(--accent); }
.filter-panel {
  position: absolute;
  top: 46px;
  right: 0;
  left: 0;
  z-index: 20;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--surface);
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.42);
}
.filter-search {
  width: 100%;
  height: 36px;
  border: 0;
  border-bottom: 1px solid var(--border);
  outline: 0;
  background: var(--surface);
  color: var(--text);
  padding: 0 11px;
}
.filter-search:focus { border-bottom-color: var(--accent); }
.filter-search-row {
  display: flex;
  border-bottom: 1px solid var(--border);
}
.filter-search-row .filter-search {
  flex: 1;
  border: 0;
  border-bottom: 0;
}
.filter-search-button {
  flex: 0 0 auto;
  padding: 0 14px;
  background: var(--accent);
  color: var(--bg);
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
}
.filter-search-button:hover { filter: brightness(1.08); }
.filter-list { max-height: 280px; overflow-y: auto; overscroll-behavior: contain; }
.filter-option {
  display: block;
  width: 100%;
  min-height: 38px;
  background: transparent;
  padding: 8px 11px;
  overflow-wrap: anywhere;
  text-align: left;
}
.filter-option:hover { background: var(--hover); }
.filter-option.selected { background: var(--hover); color: var(--accent); font-weight: 700; }
.filter-option-count { color: var(--faint); font-size: 0.76rem; font-weight: 400; }
.filter-message { padding: 12px 11px; color: var(--muted); font-size: 0.8rem; text-align: center; }
.count { margin: 20px 4px 10px; color: var(--muted); font-size: 0.8rem; }
.list { display: flex; flex-direction: column; gap: 2px; }

.track-row {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 62px;
  border-radius: 9px;
  padding: 9px 12px;
  transition: 0.15s;
}
.track-row:hover, .track-row.is-current { background: var(--surface); }
.track-row.is-current .title { color: var(--accent); }

.play-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  flex: 0 0 32px;
  border-radius: 50%;
  background: var(--hover);
  color: var(--text);
  opacity: 0;
}
.track-row:hover .play-btn, .track-row.is-current .play-btn, .play-btn:focus { opacity: 1; }
.play-btn:hover { background: var(--accent); color: var(--bg); }

.title-block { min-width: 0; flex: 1; background: transparent; text-align: left; }
.title, .artist, .meta { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.title { font-size: 0.9rem; font-weight: 700; }
.artist, .meta { color: var(--muted); font-size: 0.78rem; }
.meta { width: 190px; flex: 0 0 190px; }
.meta.genre { width: 135px; flex-basis: 135px; color: var(--faint); }

.download {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 25px;
  flex: 0 0 25px;
  color: var(--faint);
  opacity: 0;
}
.track-row:hover .download, .download:focus { opacity: 1; }
.download:hover { color: var(--accent); }

.loading, .empty { padding: 64px 20px; color: var(--muted); text-align: center; }
.empty h2 { margin-bottom: 7px; color: var(--text); font-size: 1rem; }
.spinner {
  width: 28px;
  height: 28px;
  margin: 0 auto 14px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.loading-more {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 18px;
  color: var(--muted);
  font-size: 0.8rem;
}
.loading-more .spinner { width: 18px; height: 18px; margin: 0; border-width: 2px; }

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 8px;
}
.card {
  align-items: flex-start;
  justify-content: center;
  min-height: 104px;
  border-radius: 12px;
  background: var(--surface);
  padding: 18px;
  text-align: left;
  transition: 0.15s;
}
.card:hover { background: var(--hover); transform: translateY(-1px); }
.avatar { display: none; }
.card h2 { width: 100%; margin-top: 12px; overflow: hidden; font-size: 1rem; text-overflow: ellipsis; white-space: nowrap; }
.card p { margin-top: 5px; color: var(--muted); font-size: 0.8rem; }
.library-controls { margin-bottom: 18px; }
.library-controls .search { max-width: 520px; }
.library-count { margin: -6px 0 14px; color: var(--muted); font-size: 0.8rem; }

.player {
  position: fixed;
  z-index: 10;
  right: 0;
  bottom: 0;
  left: 56px;
  display: none;
  align-items: center;
  gap: 22px;
  min-height: 82px;
  border-top: 1px solid var(--border);
  background: rgba(20, 20, 23, 0.94);
  padding: 12px max(20px, calc((100vw - 1160px) / 2));
  backdrop-filter: blur(14px);
}
.player.visible { display: flex; }
.now-playing { width: 230px; min-width: 190px; }
.now-playing strong, .now-playing span { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.now-playing strong { font-size: 0.86rem; }
.now-playing span { color: var(--muted); font-size: 0.75rem; }
.player-center { min-width: 0; flex: 1; }
.player-controls { display: flex; align-items: center; justify-content: center; gap: 18px; margin-bottom: 5px; }
.player-controls button { display: flex; background: transparent; color: var(--muted); }
.player-controls button:hover { color: var(--text); }
.player-controls .main-play {
  align-items: center;
  justify-content: center;
  width: 35px;
  height: 35px;
  border-radius: 50%;
  background: var(--text);
  color: var(--bg);
}
.main-play:hover { background: var(--accent); color: var(--bg); }
.seek-line { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 0.68rem; font-variant-numeric: tabular-nums; }
.seek { height: 4px; flex: 1; accent-color: var(--accent); cursor: pointer; }
.player-download { color: var(--muted); }
.player-download:hover { color: var(--accent); }

.login-screen {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(10, 10, 12, 0.96);
  backdrop-filter: blur(12px);
}
.login-card {
  width: min(100%, 390px);
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  padding: 38px 30px;
  text-align: center;
}
.login-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin: 0 auto 20px;
  border-radius: 12px;
  background: var(--accent);
  color: var(--bg);
  font-size: 24px;
  font-weight: 800;
}
.login-card h1 { font-size: 1.5rem; }
.login-card p { margin: 8px 0 24px; color: var(--muted); font-size: 0.85rem; }
.login-card button {
  width: 100%;
  border-radius: 9px;
  background: var(--accent);
  color: var(--bg);
  padding: 11px 16px;
  font-weight: 700;
}
.login-card button:hover { filter: brightness(1.08); }

@media (min-width: 721px) {
  .sidebar { width: 224px; padding: 16px 12px; }
  .logo { margin-left: 8px; margin-right: 0; }
  .brand { display: block; margin-left: 10px; font-size: 0.85rem; font-weight: 700; letter-spacing: 0.04em; }
  .logo-wrap { display: flex; align-items: center; gap: 9px; margin-bottom: 26px; }
  .nav-item { justify-content: flex-start; }
  .user, .logout { display: block; }
  .main { width: calc(100% - 224px); margin-left: 224px; }
  .player { left: 224px; }
  .grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 960px) { .grid { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
@media (min-width: 1200px) { .grid { grid-template-columns: repeat(6, minmax(0, 1fr)); } }

@media (max-width: 720px) {
  .container { padding: 28px 14px 45px; }
  header { padding-bottom: 22px; }
  .meta { display: none; }
  .play-btn { opacity: 1; }
  .player { left: 56px; gap: 10px; padding: 10px 12px; }
  .now-playing { width: 32%; min-width: 100px; }
  .nav-item > span:not(.ico) { display: none; }
  .nav-item { gap: 0; }
  .library-controls .search { max-width: none; }
  .filter { flex-basis: 100%; }
  .filter-panel { width: 100%; min-width: 0; }
  #searchButton { width: 100%; }
}

@media (max-width: 440px) {
  .player { flex-wrap: wrap; gap: 3px 10px; }
  .now-playing { width: calc(100% - 32px); }
  .player-center { order: 3; flex-basis: 100%; }
  body { padding-bottom: 126px; }
}