@import url("https://fonts.googleapis.com/css2?family=Audiowide&family=Chakra+Petch:ital,wght@0,400;0,500;0,600;0,700;1,400&display=swap");

:root {
  --bg-void: #06060c;
  --bg-panel: #0f0f1c;
  --bg-panel-raised: #151527;
  --bg-card: #12121f;
  --line: rgba(255, 255, 255, 0.08);
  --line-bright: rgba(0, 245, 212, 0.35);
  --text-hi: #f2f4ff;
  --text-mid: #9ba0c4;
  --text-dim: #5c6089;
  --cyan: #00f5d4;
  --magenta: #ff2fd0;
  --violet: #7b5cff;
  --amber: #ffcc33;

  /* maimai 官方谱面难度配色 */
  --diff-easy: #48d0f2;
  --diff-basic: #2ecc71;
  --diff-advanced: #ffb020;
  --diff-expert: #ff4d5e;
  --diff-master: #b24bff;
  --diff-remaster: #e9defc;
  --diff-utage: #ff5fc4;

  --font-display: "Audiowide", "Chakra Petch", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-ui: "Chakra Petch", "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--bg-void);
  color: var(--text-hi);
  font-family: var(--font-ui);
  overflow-x: hidden;
  background-image:
    radial-gradient(ellipse 900px 500px at 12% -10%, rgba(123, 92, 255, 0.28), transparent 60%),
    radial-gradient(ellipse 700px 600px at 110% 10%, rgba(0, 245, 212, 0.16), transparent 55%),
    repeating-linear-gradient(
      0deg,
      rgba(255, 255, 255, 0.018) 0px,
      rgba(255, 255, 255, 0.018) 1px,
      transparent 1px,
      transparent 3px
    );
  background-attachment: fixed;
}

::selection {
  background: var(--magenta);
  color: #06060c;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-void);
}
::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--cyan), var(--violet));
  border-radius: 6px;
}

.app {
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

/* ---------- Topbar ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 28px;
  background: rgba(6, 6, 12, 0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.logo {
  margin: 0;
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 0.06em;
  font-weight: 400;
  color: var(--text-hi);
  text-shadow: 0 0 18px rgba(0, 245, 212, 0.55);
  white-space: nowrap;
}

.logo span {
  color: var(--magenta);
  text-shadow: 0 0 18px rgba(255, 47, 208, 0.65);
}

.search {
  flex: 1;
  max-width: 420px;
}

.search input {
  width: 100%;
  padding: 11px 16px;
  border-radius: 3px;
  border: 1px solid var(--line);
  background: var(--bg-panel);
  color: var(--text-hi);
  font-family: var(--font-ui);
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.search input::placeholder {
  color: var(--text-dim);
}

.search input:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(0, 245, 212, 0.15);
}

/* ---------- Layout ---------- */

.layout {
  flex: 1;
  display: flex;
  align-items: flex-start;
  gap: 0;
}

.category-nav {
  position: sticky;
  top: 73px;
  align-self: stretch;
  width: 232px;
  flex-shrink: 0;
  max-height: calc(100vh - 73px);
  overflow-y: auto;
  padding: 18px 10px 40px;
  border-right: 1px solid var(--line);
}

.cat-btn {
  display: flex;
  align-items: baseline;
  gap: 10px;
  width: 100%;
  padding: 10px 12px;
  margin-bottom: 2px;
  border: none;
  background: transparent;
  color: var(--text-mid);
  font-family: var(--font-ui);
  font-size: 14px;
  font-weight: 500;
  text-align: left;
  border-radius: 2px;
  cursor: pointer;
  position: relative;
  transition: color 0.15s, background 0.15s;
}

.cat-btn .cat-num {
  font-family: var(--font-display);
  font-size: 11px;
  color: var(--text-dim);
  min-width: 26px;
}

.cat-btn:hover {
  color: var(--text-hi);
  background: rgba(255, 255, 255, 0.03);
}

.cat-btn.active {
  color: var(--cyan);
  background: linear-gradient(90deg, rgba(0, 245, 212, 0.1), transparent);
}

.cat-btn.active .cat-num {
  color: var(--cyan);
}

.cat-btn.active::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 3px;
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan);
  border-radius: 2px;
}

.cat-count {
  margin-left: auto;
  font-size: 11px;
  color: var(--text-dim);
}

/* ---------- Content ---------- */

.content {
  flex: 1;
  min-width: 0;
  padding: 24px 28px 60px;
}

/* ---------- Difficulty filter bar ---------- */

.diff-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
}

.diff-filter-label {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-right: 4px;
}

.diff-filter-chip {
  appearance: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text-mid);
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 20px;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease,
    box-shadow 0.15s ease;
}

.diff-filter-chip:hover {
  border-color: var(--line-bright);
  color: var(--text-hi);
}

.diff-filter-chip.all-chip.active {
  background: var(--text-hi);
  color: var(--bg-void);
  border-color: var(--text-hi);
}

.diff-filter-chip.diff-easy.active { background: var(--diff-easy); border-color: var(--diff-easy); color: #041f2b; }
.diff-filter-chip.diff-basic.active { background: var(--diff-basic); border-color: var(--diff-basic); color: #04270f; }
.diff-filter-chip.diff-advanced.active { background: var(--diff-advanced); border-color: var(--diff-advanced); color: #2b1900; }
.diff-filter-chip.diff-expert.active { background: var(--diff-expert); border-color: var(--diff-expert); color: #2a0004; }
.diff-filter-chip.diff-master.active { background: var(--diff-master); border-color: var(--diff-master); color: #f8ecff; }
.diff-filter-chip.diff-remaster.active { background: var(--diff-remaster); border-color: var(--diff-remaster); color: #2a2135; }
.diff-filter-chip.diff-utage.active { background: var(--diff-utage); border-color: var(--diff-utage); color: #2a0018; }

.result-summary {
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  margin-bottom: 18px;
  text-transform: uppercase;
}

.result-summary strong {
  color: var(--cyan);
}

/* ---------- Song list cards (no modal — everything inline) ---------- */

.song-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 14px;
}

.song-card {
  display: flex;
  gap: 14px;
  padding: 12px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 6px;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.song-card:hover {
  border-color: var(--line-bright);
  box-shadow: 0 10px 26px -14px rgba(0, 245, 212, 0.35);
}

.song-card.playing {
  border-color: var(--cyan);
  box-shadow: 0 0 0 1px rgba(0, 245, 212, 0.3), 0 10px 26px -14px rgba(0, 245, 212, 0.5);
}

.song-card .cover-wrap {
  width: 84px;
  height: 84px;
  flex-shrink: 0;
  border-radius: 4px;
  overflow: hidden;
  background: linear-gradient(135deg, #171728, #0c0c17);
}

.song-card .cover-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.song-card .info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 5px;
  justify-content: center;
}

.song-card .title {
  font-size: 14px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-hi);
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.song-card .artist {
  font-size: 11px;
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.song-card .artist:empty {
  display: none;
}

.diff-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.diff-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 5px 2px 8px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line);
  font-size: 10.5px;
  line-height: 1.6;
}

.diff-chip-name {
  color: var(--text-mid);
  letter-spacing: 0.02em;
}

.diff-chip-lv {
  font-family: var(--font-display);
  font-size: 10.5px;
  padding: 1px 6px;
  border-radius: 2px;
  color: #06060c;
  font-weight: 700;
}

.diff-chip.diff-easy .diff-chip-lv { background: var(--diff-easy); }
.diff-chip.diff-basic .diff-chip-lv { background: var(--diff-basic); }
.diff-chip.diff-advanced .diff-chip-lv { background: var(--diff-advanced); }
.diff-chip.diff-expert .diff-chip-lv { background: var(--diff-expert); color: #2a0004; }
.diff-chip.diff-master .diff-chip-lv { background: var(--diff-master); color: #f8ecff; }
.diff-chip.diff-remaster .diff-chip-lv { background: var(--diff-remaster); }
.diff-chip.diff-utage .diff-chip-lv { background: var(--diff-utage); color: #2a0018; }

/* inline 播放器 + 下载 */

.player-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 2px;
}

.play-btn {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid var(--line-bright);
  background: rgba(0, 245, 212, 0.08);
  color: var(--cyan);
  font-size: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease;
}

.play-btn:hover {
  background: rgba(0, 245, 212, 0.2);
}

.play-btn:active {
  transform: scale(0.92);
}

.song-card.playing .play-btn {
  background: var(--cyan);
  color: #06060c;
}

.progress-track {
  position: relative;
  flex: 1;
  height: 4px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.08);
  cursor: pointer;
}

.progress-fill {
  position: absolute;
  inset: 0;
  width: 0%;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
}

.time {
  flex-shrink: 0;
  font-family: var(--font-display);
  font-size: 10px;
  color: var(--text-dim);
  min-width: 34px;
}

.dl-btn {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 10px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  color: #06060c;
  font-family: var(--font-display);
  font-size: 10.5px;
  letter-spacing: 0.03em;
  text-decoration: none;
  transition: transform 0.15s ease, filter 0.15s ease;
}

.dl-btn:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.dl-icon {
  font-size: 12px;
  line-height: 1;
}

.empty-state {
  padding: 80px 0;
  text-align: center;
  color: var(--text-dim);
  font-family: var(--font-display);
  letter-spacing: 0.04em;
}

/* ---------- Responsive ---------- */

@media (max-width: 760px) {
  .topbar {
    flex-wrap: wrap;
    padding: 14px 16px;
  }

  .layout {
    flex-direction: column;
  }

  .category-nav {
    position: static;
    width: 100%;
    max-height: none;
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    overflow-y: visible;
    border-right: none;
    border-bottom: 1px solid var(--line);
    padding: 12px 14px;
    gap: 4px;
  }

  .cat-btn {
    width: auto;
    white-space: nowrap;
  }

  .cat-btn.active::before {
    left: 6px;
    right: 6px;
    top: auto;
    bottom: 0;
    height: 2px;
    width: auto;
  }

  .content {
    padding: 18px 16px 40px;
  }

  .song-grid {
    grid-template-columns: 1fr;
  }

  .song-card {
    padding: 10px;
  }

  .song-card .cover-wrap {
    width: 68px;
    height: 68px;
  }
}