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

body {
  background: transparent;
  color: white;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.main-container {
  text-align: center;
  padding: 40px 20px;
  width: 100%;
  max-width: 860px;
}

/* 타이틀 섹션 */
.title-area {
  margin-bottom: 48px;
}

.title {
  font-size: 72px;
  font-weight: 900;
  color: white;
  text-shadow:
    0 0 20px rgba(255, 107, 157, 0.9),
    0 0 40px rgba(255, 107, 157, 0.6),
    0 0 80px rgba(200, 100, 255, 0.4);
  letter-spacing: 4px;
  margin-bottom: 12px;
}

.title-plus {
  color: #64c8ff;
  text-shadow:
    0 0 20px rgba(100, 200, 255, 0.9),
    0 0 40px rgba(100, 200, 255, 0.6);
}

.subtitle {
  color: #aaa;
  font-size: 15px;
  letter-spacing: 6px;
  margin-bottom: 48px;
}

/* 버튼 그룹 */
.btn-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  width: 100%;
  max-width: 380px;
  margin: 0 auto;
}

/* 버튼 공통 스타일 */
.btn {
  display: inline-block;
  padding: 18px;
  border: none;
  border-radius: 50px;
  font-size: 17px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  width: 100%;
}

.btn:hover {
  opacity: 0.88;
  transform: scale(1.02);
}

.btn-guest {
  background: linear-gradient(135deg, #ff6b9d, #c44dff);
  color: white;
}

.btn-login {
  background: transparent;
  color: white;
  border: 2px solid rgba(255, 255, 255, 0.3) !important;
}

.btn-login:hover {
  border-color: rgba(255, 255, 255, 0.7) !important;
  background: rgba(255, 255, 255, 0.05);
}

.btn-ranking {
  background: #1a1a2e;
  color: #ffd700;
  border: 1px solid #ffd700;
}

.btn-ranking:hover {
  background: #ffd700;
  color: #000;
}

.btn-cancel {
  background: #2a2a4a;
  color: #aaa;
  margin-top: 20px;
  padding: 10px 32px;
  width: auto;
  border-radius: 12px;
}

/* 로그인된 유저 영역 */
.logged-in-area {
  margin-top: 8px;
}

.user-badge {
  background: #1a1a2e;
  border: 1px solid #2a2a4a;
  border-radius: 12px;
  padding: 14px 24px;
  margin-bottom: 20px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
}

.btn-logout {
  background: none;
  border: 1px solid #555;
  color: #aaa;
  padding: 4px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
}

.btn-logout:hover {
  border-color: #ff6b9d;
  color: #ff6b9d;
}

.logged-btn-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  width: 380px;
  margin: 0 auto;
}

/* 모달 시스템 */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: #0f0f1a;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal {
  background: #1a1a2e;
  border: 1px solid #2a2a4a;
  border-radius: 24px;
  padding: 40px;
  width: 100%;
  max-width: 520px;
  text-align: center;
}

/* 전체화면 모달 */
.fullscreen-modal {
  width: 100vw !important;
  max-width: 100vw !important;
  height: 100vh !important;
  border-radius: 0 !important;
  border: none !important;
  background: #0f0f1a !important;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px !important;
  overflow-y: auto;
}

/* 모달 상단 헤더 */
.modal-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
}

.modal h2 {
  font-size: 22px;
  color: #ccc;
  margin-bottom: 32px;
}

/* 랭킹 버튼 */
.btn-ranking-modal {
  background: #2a2a4a;
  color: #ffd700;
  border: 1px solid #ffd70055;
  border-radius: 10px;
  padding: 14px 28px;
  font-size: 18px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-ranking-modal:hover {
  border-color: #ffd700;
  background: #ffd70022;
}

/* 곡 선택 그리드 */
.song-grid {
  display: flex;
  gap: 28px;
  justify-content: center;
  margin-bottom: 8px;
}

.song-card {
  width: 260px;
  cursor: pointer;
  border-radius: 20px;
  border: 2px solid #2a2a4a;
  overflow: hidden;
  transition: all 0.2s;
  background: #12122a;
}

.song-card:hover {
  border-color: #ff6b9d;
  transform: translateY(-6px);
  box-shadow: 0 12px 32px rgba(255, 107, 157, 0.25);
}

.song-img {
  width: 100%;
  height: 260px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 80px;
}

.song-title {
  padding: 16px 8px 4px;
  font-size: 20px;
  font-weight: 700;
  color: #eee;
}

.song-desc {
  padding: 0 8px 18px;
  font-size: 13px;
  color: #888;
}

/* 곡 선택 미리보기 및 단계 이동 */
.selected-song-preview {
  font-size: 16px;
  color: #ff6b9d;
  font-weight: 700;
  margin-bottom: 20px;
  padding: 10px;
  background: rgba(255, 107, 157, 0.1);
  border-radius: 10px;
  width: 100%;
  max-width: 500px;
}

.back-step {
  background: none;
  border: none;
  color: #888;
  font-size: 18px;
  cursor: pointer;
  display: block;
}

.back-step:hover {
  color: #ff6b9d;
}

/* 난이도 리스트 카드 */
.diff-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 500px;
  width: 100%;
  margin: 0 auto;
}

.diff-card {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 24px 28px;
  background: #12122a;
  border: 2px solid #2a2a4a;
  border-radius: 14px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
}

.diff-card:hover {
  transform: translateX(4px);
}

.diff-card.easy:hover   { border-color: #4caf50; box-shadow: 0 0 16px rgba(76, 175, 80, 0.2); }
.diff-card.normal:hover { border-color: #ffc107; box-shadow: 0 0 16px rgba(255, 193, 7, 0.2); }
.diff-card.hard:hover   { border-color: #f44336; box-shadow: 0 0 16px rgba(244, 67, 54, 0.2); }

.diff-icon { font-size: 40px; }
.diff-info { flex: 1; }
.diff-name { font-size: 22px; font-weight: 700; color: #eee; }
.diff-desc { font-size: 14px; color: #888; margin-top: 4px; }
.diff-arrow { color: #444; font-size: 18px; }

.diff-card.easy:hover .diff-name   { color: #4caf50; }
.diff-card.normal:hover .diff-name { color: #ffc107; }
.diff-card.hard:hover .diff-name   { color: #f44336; }

.diff-card:hover .diff-arrow { color: #ff6b9d; }

/* 닉네임 변경 팝업 (index.html) */
.nick-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.nick-modal {
  background: #1a1a2e;
  border: 1px solid #2a2a4a;
  border-radius: 14px;
  padding: 24px;
  width: 320px;
  text-align: left;
}
.nick-modal h3 { margin-bottom: 8px; }
.nick-desc { color: #aaa; font-size: 13px; margin-bottom: 14px; }
.nick-modal input {
  width: 100%;
  padding: 12px;
  border-radius: 10px;
  border: 2px solid #444;
  background: #16213e;
  color: #fff;
  font-size: 15px;
}
.nick-modal input:focus { outline: none; border-color: #ff6b9d; }
.nick-error { color: #ff6b9d; font-size: 13px; min-height: 18px; margin-top: 8px; }
.nick-btns { display: flex; gap: 8px; margin-top: 10px; }
.nick-btns button {
  flex: 1;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid #555;
  background: none;
  color: #ccc;
  cursor: pointer;
}
.nick-btns .nick-save { background: #e94560; border-color: #e94560; color: #fff; font-weight: bold; }
.nick-btns button:disabled { opacity: 0.5; cursor: default; }