:root {
  --bg: #0d0d0d;
  --surface: #161616;
  --surface2: #1e1e1e;
  --border: #333;
  --gold: #C9A96E;
  --gold2: #E8D5A8;
  --gold-dim: #8B7340;
  --text: #E8E8E8;
  --muted: #888;
  --error: #e05c5c;
  --error-bg: #2a1111;
  --success: #5cad7a;
  --radius: 12px;
  --transition: 0.2s ease;
}

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

html, body {
  height: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Apple SD Gothic Neo',
    'Noto Sans KR', sans-serif;
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── 컨테이너 ── */
.container {
  max-width: 640px;
  width: 100%;
  margin: 0 auto;
  padding: 40px 20px 32px;
  flex: 1;
}

/* ── 헤더 ── */
.header {
  text-align: center;
  margin-bottom: 40px;
}

.logo {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: 4px;
  background: linear-gradient(135deg, var(--gold), var(--gold2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 6px;
}

.subtitle {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 2px;
  text-transform: uppercase;
}

/* ── 카드 ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
  margin-bottom: 20px;
}

.card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--gold2);
  margin-bottom: 8px;
}

.card-desc {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 20px;
}

/* ── 입력 그룹 ── */
.input-group {
  display: flex;
  gap: 10px;
}

.code-input {
  flex: 1;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 3px;
  padding: 12px 16px;
  outline: none;
  transition: border-color var(--transition);
  text-transform: uppercase;
}

.code-input::placeholder {
  color: var(--muted);
  letter-spacing: 0;
  font-weight: 400;
  text-transform: none;
}

.code-input:focus {
  border-color: var(--gold-dim);
}

/* ── 버튼 ── */
.btn-primary {
  background: linear-gradient(135deg, var(--gold), var(--gold2));
  color: #0d0d0d;
  font-size: 14px;
  font-weight: 700;
  border: none;
  border-radius: 8px;
  padding: 12px 22px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  transition: opacity var(--transition), transform var(--transition);
}

.btn-primary:hover:not(:disabled) {
  opacity: 0.88;
  transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ── 스피너 ── */
.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(0,0,0,0.25);
  border-top-color: #0d0d0d;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ── 에러 메시지 ── */
.error-msg {
  margin-top: 14px;
  padding: 12px 16px;
  background: var(--error-bg);
  border: 1px solid var(--error);
  border-radius: 8px;
  color: var(--error);
  font-size: 13px;
}

/* ── 릴리즈 카드 ── */
.release-card {
  padding: 0;
  overflow: hidden;
}

.release-header {
  padding: 28px 32px 24px;
  border-bottom: 1px solid var(--border);
}

.release-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: #0d0d0d;
  background: linear-gradient(135deg, var(--gold), var(--gold2));
  padding: 3px 10px;
  border-radius: 20px;
  margin-bottom: 12px;
}

.release-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}

.release-desc {
  font-size: 13px;
  color: var(--muted);
}

/* ── 트랙 리스트 ── */
.track-list {
  list-style: none;
  padding: 0;
}

.track-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 32px;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.track-item:last-child {
  border-bottom: none;
}

.track-item:hover {
  background: var(--surface2);
}

.track-num {
  font-size: 12px;
  color: var(--gold-dim);
  font-weight: 700;
  width: 20px;
  text-align: center;
  flex-shrink: 0;
}

.track-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 32px 10px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.track-divider .divider-badge {
  font-size: 11px;
  font-weight: 700;
  color: var(--bg);
  background: linear-gradient(135deg, var(--gold), var(--gold2));
  padding: 3px 10px;
  border-radius: 4px;
  flex-shrink: 0;
}

.track-divider .divider-title {
  font-size: 13px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.track-info {
  flex: 1;
  min-width: 0;
}

.track-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.track-meta {
  font-size: 12px;
  color: var(--muted);
  margin-top: 2px;
}

.track-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.track-size {
  font-size: 11px;
  color: var(--muted);
}

.track-duration {
  font-size: 11px;
  color: var(--muted);
  min-width: 36px;
  text-align: right;
}

.btn-download {
  background: transparent;
  border: 1px solid var(--gold-dim);
  color: var(--gold);
  font-size: 12px;
  font-weight: 600;
  border-radius: 6px;
  padding: 5px 12px;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  white-space: nowrap;
}

.btn-download:hover {
  background: linear-gradient(135deg, var(--gold), var(--gold2));
  color: #0d0d0d;
  border-color: transparent;
}

/* ── 전체 다운로드 링크 ── */
.drive-link-wrap {
  padding: 20px 32px;
  border-top: 1px solid var(--border);
}

.btn-drive {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--gold), var(--gold2));
  color: #0d0d0d;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  border-radius: 8px;
  padding: 12px 22px;
  width: 100%;
  justify-content: center;
  transition: opacity var(--transition), transform var(--transition);
}

.btn-drive:hover {
  opacity: 0.88;
  transform: translateY(-1px);
}

.btn-drive:active {
  transform: translateY(0);
}

/* ── 안내 카드 ── */
.notice-card {
  padding: 20px 28px;
}

.notice-text {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.8;
}

/* ── 푸터 ── */
.footer {
  text-align: center;
  padding: 28px 20px;
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.footer-logo {
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 3px;
  background: linear-gradient(135deg, var(--gold), var(--gold2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 6px;
}

.footer-copy {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 4px;
}

.footer-info {
  font-size: 11px;
  color: #555;
}

/* ── 언어 전환 ── */
.lang-switch {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-top: 14px;
}

/* ── 언어 전환 버튼 ── */
.lang-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
  border-radius: 20px;
  padding: 4px 12px;
  cursor: pointer;
  transition: all var(--transition);
}
.lang-btn:hover {
  border-color: var(--gold-dim);
  color: var(--text);
}
.lang-active {
  background: var(--gold-dim);
  border-color: var(--gold-dim);
  color: #0d0d0d;
}

/* ── 유틸 ── */
.hidden {
  display: none !important;
}

/* ── 반응형 ── */
@media (max-width: 480px) {
  .container {
    padding: 28px 16px 24px;
  }

  .card {
    padding: 22px 20px;
  }

  .logo {
    font-size: 22px;
    letter-spacing: 3px;
  }

  .input-group {
    flex-direction: column;
  }

  .btn-primary {
    justify-content: center;
  }

  .release-header {
    padding: 22px 20px 18px;
  }

  .track-item {
    padding: 12px 20px;
    gap: 10px;
  }

  .track-size {
    display: none;
  }

  .drive-link-wrap {
    padding: 16px 20px;
  }
}