:root {
  --bg-start: #f0f4ff;
  --bg-end: #f7fbff;
  --card: #ffffff;
  --text-main: #1e293b;
  --text-sub: #64748b;
  --line: #e2e8f0;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --soft-blue: #dbeafe;
  --danger: #dc2626;
  --shadow: 0 20px 45px rgba(15, 23, 42, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text-main);
  background: linear-gradient(165deg, var(--bg-start) 0%, var(--bg-end) 55%, #eef6ff 100%);
}

.page-wrap {
  max-width: 980px;
  margin: 0 auto;
  padding: 40px 16px 60px;
}

.hero {
  margin-bottom: 16px;
}

.hero-title {
  margin: 0;
  font-size: 34px;
  letter-spacing: 0.3px;
}

.hero-subtitle {
  margin: 8px 0 0;
  color: var(--text-sub);
  font-size: 14px;
}

.app-card {
  background: var(--card);
  border: 1px solid rgba(37, 99, 235, 0.1);
  border-radius: 28px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #f8fbff 0%, #f4f8ff 100%);
}

.tab-btn {
  border: 0;
  background: transparent;
  color: var(--text-sub);
  font-size: 15px;
  font-weight: 600;
  padding: 16px 10px;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: all 0.2s ease;
}

.tab-btn:hover {
  background: #edf4ff;
  color: #334155;
}

.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.panel {
  padding: 24px;
}

.tab-panel {
  animation: tab-fade 0.2s ease;
}

@keyframes tab-fade {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.inline-form {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.input,
.select,
.btn {
  height: 44px;
  border-radius: 12px;
  font-size: 14px;
}

.input,
.select {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text-main);
  padding: 0 12px;
  outline: none;
}

.input {
  flex: 1;
  min-width: 220px;
}

.input:focus,
.select:focus {
  border-color: #93c5fd;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.select {
  min-width: 118px;
}

.btn {
  border: 0;
  padding: 0 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn.primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 8px 18px rgba(37, 99, 235, 0.2);
}

.btn.primary:hover:not(:disabled) {
  background: var(--primary-hover);
}

.btn.ghost {
  background: #fff;
  color: #1f2937;
  border: 1px solid var(--line);
}

.btn.ghost:hover:not(:disabled) {
  background: #f8fafc;
}

.hint,
.tip {
  margin: 10px 2px 0;
  color: var(--text-sub);
  font-size: 12px;
  line-height: 1.5;
}

.error-text {
  margin: 10px 2px 0;
  color: var(--danger);
  font-size: 13px;
}

.block {
  background: #f8fbff;
  border: 1px solid #e6efff;
  border-radius: 14px;
  padding: 14px;
}

.block + .block {
  margin-top: 12px;
}

.section-title {
  margin: 0 0 10px;
  font-size: 15px;
}

.playlist-box {
  margin-top: 10px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
}

.results-card {
  border-top: 1px solid var(--line);
  background: #fcfdff;
  padding: 22px 24px 24px;
}

.result-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 12px;
  color: var(--text-sub);
  font-size: 13px;
}

.song-list {
  display: grid;
  gap: 10px;
}

.song-item {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  padding: 10px 12px;
}

.song-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.song-main {
  flex: 1;
  min-width: 0;
  margin-bottom: 0;
}

.song-name {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
}

.song-meta {
  margin: 6px 0 0;
  color: var(--text-sub);
  font-size: 13px;
}

.song-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  flex-shrink: 0;
}

.compact {
  height: 36px;
  border-radius: 10px;
  font-size: 13px;
}

.quality {
  min-width: 88px;
}

.audio-wrap {
  margin-top: 10px;
}

audio {
  width: 100%;
}

.rank-grid {
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.rank-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  color: var(--text-main);
  text-align: left;
  padding: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.rank-item:hover {
  border-color: #bfdbfe;
  background: var(--soft-blue);
}

.rank-item strong {
  display: block;
  font-size: 14px;
}

.rank-item span {
  display: block;
  margin-top: 6px;
  color: var(--text-sub);
  font-size: 12px;
}

.pager {
  margin-top: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.pager-text {
  font-size: 13px;
  color: var(--text-sub);
}

.pager-btn {
  min-width: 92px;
}

@media (max-width: 720px) {
  .page-wrap {
    padding-top: 26px;
  }

  .hero-title {
    font-size: 28px;
  }

  .panel,
  .results-card {
    padding: 16px;
  }

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

  .tab-btn {
    border-bottom-width: 1px;
  }

  .tab-btn.active {
    border-bottom-width: 2px;
  }

  .inline-form {
    gap: 8px;
  }

  .input,
  .select,
  .btn {
    width: 100%;
    min-width: 100%;
  }

  .song-top {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  .song-main {
    margin-bottom: 0;
  }

  .song-actions {
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .compact {
    height: 44px;
    font-size: 14px;
  }

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

  .result-head {
    flex-direction: column;
    align-items: flex-start;
  }
}