/* =====================================================
   Meloflix — Modern Music Player UI
   Soft Coral & Teal Design System
   ===================================================== */

/* ===== Design Tokens ===== */
:root {
  /* Background — soft muted, NOT pure white */
  --bg-gradient: linear-gradient(160deg, #EDE9E4 0%, #E4DED7 100%);

  /* Glassmorphism surfaces — clean white */
  --surface-bg: rgba(255, 255, 255, 0.92);
  --surface-border: rgba(0, 0, 0, 0.07);
  --surface-hover: rgba(255, 255, 255, 0.98);
  --surface-deep: rgba(255, 255, 255, 1);

  /* Accent / primary action */
  --accent: #F4A6A0;
  --accent-light: #E8928C;
  --accent-gradient: linear-gradient(135deg, #F4A6A0 0%, #E8928C 100%);

  /* Glow shadows */
  --glow-accent: 0 0 25px rgba(244, 166, 160, 0.35);
  --glow-accent-hover: 0 0 35px rgba(232, 146, 140, 0.55);
  --glow-cover: 0 0 40px rgba(244, 166, 160, 0.3);

  /* Text */
  --text-primary: #2C2C2C;
  --text-secondary: #5a5a5a;
  --text-tertiary: #7a7a7a;
}

/* ===== Base ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  user-select: none;
}

html {
  overflow-x: hidden;
  font-size: 16px;
}

body {
  min-height: 100vh;
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-primary);
  font-family: 'DM Sans', sans-serif;
  overflow-x: hidden;
}

/* ===== App Container ===== */
.app {
  min-height: 100vh;
  display: flex;
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
  gap: 20px;
}

/* ===== Sidebar ===== */
.sidebar {
  width: 28%;
  min-width: 280px;
  height: calc(100vh - 40px);
  background: var(--surface-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--surface-border);
  border-radius: 20px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sidebar-header {
  background: var(--surface-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--surface-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  position: sticky;
  top: 0;
  z-index: 10;
}

.sidebar-header h1 {
  font-family: 'DM Sans', sans-serif;
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.upload-btn {
  background: var(--accent-gradient);
  border: none;
  padding: 12px 24px;
  border-radius: 30px;
  color: #fff;
  font-weight: 700;
  font-family: 'DM Sans', sans-serif;
  font-size: 14px;
  cursor: pointer;
  outline: none;
  box-shadow: var(--glow-accent);
  letter-spacing: 0.5px;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.upload-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--glow-accent-hover);
}

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

/* ===== Playlist ===== */
.playlist {
  width: 100%;
  padding: 20px;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-gutter: stable;
}

.playlist h2 {
  font-family: 'DM Sans', sans-serif;
  font-weight: 700;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-secondary);
  padding: 0 4px 12px;
}

.playlist li {
  width: 100%;
  background: var(--surface-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--surface-border);
  border-radius: 14px;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.playlist li:hover {
  background: var(--surface-hover);
  transform: translateX(4px);
  border-color: var(--accent);
}

.playlist li.active {
  background: rgba(244, 166, 160, 0.12);
  border-color: var(--accent);
  box-shadow: var(--glow-accent);
}

.playlist li.active span:last-child h3 {
  color: var(--accent-light);
}

.playlist li span:first-child {
  flex: 0 0 44px;
}

.playlist li span:last-child {
  flex: 1;
  padding: 0;
}

.playlist li span img {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 10px;
  pointer-events: none;
  object-fit: cover;
}

.playlist li span h3 {
  font-weight: 600;
  font-family: 'DM Sans', sans-serif;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  color: var(--text-primary);
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.playlist li span h3 svg {
  opacity: 0.4;
  transition: opacity 0.3s ease;
  flex-shrink: 0;
  margin-left: 8px;
}

.playlist li:hover span h3 svg {
  opacity: 0.8;
}

.playlist li span p {
  font-weight: 500;
  font-family: 'DM Sans', sans-serif;
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
}

.playlist li span svg {
  vertical-align: middle;
  flex-shrink: 0;
}

/* ===== Main Player ===== */
.main {
  flex: 1;
  background: var(--surface-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--surface-border);
  border-radius: 20px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
  padding: 40px;
  position: relative;
}

/* Settings button pinned to top-right of the main player */
.main .settings-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--surface-border);
  color: var(--text-secondary);
  width: 50px;
  height: 50px;
  cursor: pointer;
  border-radius: 50%;
  transition: all 0.3s ease;
  outline: none;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  z-index: 10;
}

.main .settings-btn:hover {
  background: var(--surface-hover);
  color: var(--accent-light);
  border-color: var(--accent);
  box-shadow: var(--glow-accent);
}

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

/* ===== Cover Art ===== */
.cover {
  width: 260px;
  height: 260px;
  border-radius: 20px;
  overflow: hidden;
  position: relative;
  transition: all 0.4s ease;
}

.cover::before {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: 26px;
  background: var(--accent-gradient);
  z-index: -1;
  opacity: 0.4;
  filter: blur(14px);
  transition: opacity 0.4s ease;
}

.cover.playing::before {
  opacity: 0.6;
  animation: pulse-glow 2s ease-in-out infinite alternate;
}

@keyframes pulse-glow {
  0% {
    opacity: 0.4;
    filter: blur(14px) saturate(1.2);
  }
  100% {
    opacity: 0.7;
    filter: blur(18px) saturate(1.5);
  }
}

.cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 16px;
  display: block;
  transition: transform 0.4s ease;
}

/* ===== Song Info ===== */
.song-info {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.song-info::before {
  content: 'NOW PLAYING';
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent-light);
  font-weight: 700;
  padding: 5px 16px;
  border: 1px solid var(--surface-border);
  border-radius: 20px;
  background: rgba(244, 166, 160, 0.1);
}

#song-title {
  font-family: 'DM Sans', sans-serif;
  font-size: 28px;
  font-weight: 800;
  color: var(--text-primary);
  text-align: center;
  max-width: 420px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

#song-artist {
  font-size: 14px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: 'DM Sans', sans-serif;
  font-weight: 500;
}

#song-artist svg {
  color: var(--accent-light);
}

/* ===== Progress Bar ===== */
.progress-bar {
  width: 80%;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.time {
  display: flex;
  justify-content: space-between;
  font-family: 'DM Sans', sans-serif;
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
}

#seek-bar {
  width: 100%;
  -webkit-appearance: none;
  height: 6px;
  background: rgba(244, 166, 160, 0.15);
  border-radius: 10px;
  outline: none;
  cursor: pointer;
  transition: all 0.3s ease;
}

#seek-bar::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-light);
  cursor: pointer;
  border: none;
  box-shadow: 0 0 12px rgba(232, 146, 140, 0.6);
  transition: all 0.3s ease;
}

#seek-bar::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-light);
  cursor: pointer;
  border: none;
  box-shadow: 0 0 12px rgba(232, 146, 140, 0.6);
}

#seek-bar:hover::-webkit-slider-thumb {
  width: 20px;
  height: 20px;
  box-shadow: 0 0 18px rgba(232, 146, 140, 0.85);
}

/* ===== Controls ===== */
.controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 32px;
  margin-top: 10px;
}

#play-btn {
  border: 2px solid rgba(44, 44, 44, 0.1);
  background: #FFF;
  width: 70px;
  height: 70px;
  border-radius: 50%;
  color: #A8D8D0;
  cursor: pointer;
  font-size: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  outline: none;
  box-shadow: var(--glow-accent);
}

#play-btn svg {
  stroke: #A8D8D0;
}

#play-btn:hover {
  transform: scale(1.08);
  box-shadow: var(--glow-accent-hover);
}

#play-btn:active {
  transform: scale(0.94);
}

/* Pulse animation when playing */
#play-btn.playing svg {
  animation: beat 1.5s ease-in-out infinite alternate;
}

@keyframes beat {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.controls button:not(#play-btn) {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--surface-border);
  color: var(--text-secondary);
  width: 50px;
  height: 50px;
  cursor: pointer;
  border-radius: 50%;
  transition: all 0.3s ease;
  outline: none;
  position: relative;
  overflow: visible;
}

.controls button:not(#play-btn):hover {
  background: var(--surface-hover);
  color: var(--accent-light);
  border-color: var(--accent);
  box-shadow: var(--glow-accent);
}

.controls button:not(#play-btn):active {
  transform: scale(0.92);
}

/* Tooltip */
.controls button:not(#play-btn)::after,
.main .settings-btn::after {
  content: attr(data-title);
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(255, 255, 255, 0.9);
  color: var(--text-primary);
  font-weight: 500;
  font-size: 12px;
  padding: 6px 14px;
  border-radius: 8px;
  border: 1px solid var(--surface-border);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
  margin-top: 8px;
  z-index: 100;
}

.controls button:not(#play-btn):hover::after,
.main .settings-btn:hover::after {
  opacity: 1;
  top: calc(100% + 12px);
}

/* Active state for shuffle/repeat buttons */
.active svg {
  color: var(--accent-light);
}

.repeat-off {
  color: var(--text-tertiary);
}

/* ===== Settings Popup ===== */
.popup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
  z-index: 200;
}

.popup-overlay.active {
  opacity: 1;
  visibility: visible;
  pointer-events: all;
}

.popup {
  background: var(--surface-deep);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--surface-border);
  border-radius: 24px;
  box-shadow: 0 0 50px rgba(244, 166, 160, 0.4), 0 0 100px rgba(232, 146, 140, 0.15);
  width: 100%;
  max-width: 420px;
  transform: scale(0.9);
  opacity: 0;
  transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
  overflow: hidden;
}

.popup-overlay.active .popup {
  transform: scale(1);
  opacity: 1;
}

.popup-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--surface-border);
  background: var(--surface-bg);
}

.popup-header h3 {
  font-family: 'DM Sans', sans-serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.popup-close {
  background: rgba(244, 166, 160, 0.15);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--surface-border);
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  border-radius: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  outline: none;
}

.popup-close:hover {
  background: var(--surface-hover);
  color: var(--accent-light);
  transform: scale(1.1);
  box-shadow: var(--glow-accent);
  border-color: var(--accent);
}

.popup-body {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 24px;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.control-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: 'DM Sans', sans-serif;
}

.control-name {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
}

.control-name svg {
  color: var(--accent-light);
}

.control-value {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  min-width: 70px;
  text-align: right;
}

.popup input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 8px;
  background: rgba(244, 166, 160, 0.15);
  border-radius: 10px;
  outline: none;
  cursor: pointer;
  transition: all 0.3s ease;
}

.popup input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-light);
  cursor: pointer;
  border: 2px solid rgba(244, 166, 160, 0.4);
  box-shadow: 0 0 12px rgba(232, 146, 140, 0.6);
  transition: all 0.3s ease;
}

.popup input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-light);
  cursor: pointer;
  border: 2px solid rgba(244, 166, 160, 0.4);
  box-shadow: 0 0 12px rgba(232, 146, 140, 0.6);
}

.popup input[type="range"]:hover::-webkit-slider-thumb {
  width: 22px;
  height: 22px;
  box-shadow: 0 0 20px rgba(232, 146, 140, 0.85);
  transform: scale(1.1);
}

.popup-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--surface-border);
  background: var(--surface-bg);
  text-align: center;
}

.reset-btn {
  background: var(--accent-gradient);
  border: none;
  padding: 10px 24px;
  border-radius: 30px;
  color: #fff;
  font-weight: 600;
  font-family: 'DM Sans', sans-serif;
  font-size: 13px;
  cursor: pointer;
  outline: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.3s ease;
  box-shadow: var(--glow-accent);
}

.reset-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--glow-accent-hover);
}

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

/* ===== Responsive Breakpoints ===== */
@media (max-width: 768px) {
  .app {
    flex-direction: column;
    padding: 10px;
    gap: 12px;
    max-height: 100vh;
  }

  .sidebar {
    width: 100%;
    max-width: none;
    height: calc(100vh - 24px);
  }

  .sidebar-header {
    position: sticky;
    top: 0;
    z-index: 10;
  }

  .main {
    padding: 28px 20px;
    gap: 20px;
  }

  .cover {
    width: 200px;
    height: 200px;
  }

  .controls {
    gap: 20px;
  }

  .controls button:not(#play-btn) {
    width: 44px;
    height: 44px;
  }

  #play-btn {
    width: 60px;
    height: 60px;
  }

  .progress-bar {
    width: 95%;
  }

  #song-title {
    font-size: 22px;
  }
}

@media (max-width: 480px) {
  .app {
    padding: 8px;
    gap: 10px;
  }

  .sidebar {
    height: calc(100vh - 16px);
    border-radius: 16px;
  }

  .sidebar-header {
    padding: 16px 20px;
  }

  .sidebar-header h1 {
    font-size: 20px;
  }

  .upload-btn {
    padding: 10px 20px;
    font-size: 13px;
  }

  .playlist {
    padding: 16px 16px 12px;
  }

  .main {
    padding: 24px 16px;
    gap: 18px;
  }

  .cover {
    width: 170px;
    height: 170px;
  }

  #song-title {
    font-size: 20px;
    max-width: 100%;
  }

  .progress-bar {
    width: 100%;
  }

  .controls {
    gap: 14px;
  }

  .controls button:not(#play-btn) {
    width: 40px;
    height: 40px;
  }

  #play-btn {
    width: 56px;
    height: 56px;
  }
}