:root {
  /* Apple System Colors (Dark Mode) */
  --bg-body: #000000;
  --bg-card: rgba(28, 28, 30, 0.65);
  --bg-input: rgba(118, 118, 128, 0.24);
  --bg-button: #007AFF;
  --bg-button-hover: #0062cc;
  
  --text-primary: #FFFFFF;
  --text-secondary: rgba(235, 235, 245, 0.6);
  --text-tertiary: rgba(235, 235, 245, 0.3);
  
  --border-light: rgba(84, 84, 88, 0.36);
  --border-subtle: rgba(84, 84, 88, 0.2);
  
  --accent: #0A84FF;
  --danger: #FF453A;
  
  --radius-l: 28px;
  --radius-m: 16px;
  --radius-s: 10px;
  
  --shadow-card: 0 8px 40px rgba(0, 0, 0, 0.4);
  --backdrop: blur(40px) saturate(180%);
  
  --font-stack: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

*, *::before, *::after {
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  background-color: var(--bg-body);
  /* Subtle ambient gradient */
  background-image: 
    radial-gradient(circle at 20% 20%, rgba(10, 132, 255, 0.15), transparent 40%),
    radial-gradient(circle at 80% 80%, rgba(94, 92, 230, 0.12), transparent 40%);
  background-attachment: fixed;
  color: var(--text-primary);
  font-family: var(--font-stack);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 40px 20px;
  line-height: 1.5;
}

/* Typography */
h1, h2, h3 {
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.02em;
}

h1 { font-size: 40px; }
h2 { font-size: 24px; }
p { margin: 0; }

.text-secondary { color: var(--text-secondary); font-size: 15px; }
.text-small { font-size: 13px; color: var(--text-tertiary); }

/* Layout */
.container {
  width: 100%;
  max-width: 800px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* Header */
.header {
  text-align: center;
  padding: 40px 0 20px;
  animation: fadeIn 0.8s ease-out;
}

.header__logo {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, #0A84FF, #5E5CE6);
  border-radius: 22px;
  margin: 0 auto 24px;
  box-shadow: 0 10px 30px rgba(10, 132, 255, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
}

.header__logo svg {
  color: white;
  width: 40px;
  height: 40px;
}

.header h1 {
  margin-bottom: 12px;
}

.tags {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.tag {
  font-size: 12px;
  padding: 6px 12px;
  border-radius: 100px;
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-secondary);
  font-weight: 500;
  transition: background 0.2s;
}

.tag:hover {
  background: rgba(255, 255, 255, 0.2);
  color: var(--text-primary);
}

/* Cards */
.card {
  background: var(--bg-card);
  backdrop-filter: var(--backdrop);
  -webkit-backdrop-filter: var(--backdrop);
  border-radius: var(--radius-l);
  border: 1px solid var(--border-subtle);
  padding: 32px;
  box-shadow: var(--shadow-card);
  transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

/* Segmented Control (Tabs) */
.segmented-control {
  background: rgba(118, 118, 128, 0.24);
  padding: 2px;
  border-radius: 9px;
  display: inline-flex;
  position: relative;
}

.segment-btn {
  border: none;
  background: transparent;
  color: var(--text-primary);
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 500;
  border-radius: 7px;
  cursor: pointer;
  position: relative;
  z-index: 2;
  transition: color 0.2s;
}

.segment-btn.active {
  background: #636366; /* Fallback */
  background: rgba(255, 255, 255, 0.2); /* Glass highlight */
  box-shadow: 0 3px 8px rgba(0,0,0,0.12), 0 3px 1px rgba(0,0,0,0.04);
}

/* Forms */
.input-group {
  position: relative;
  margin-bottom: 24px;
}

.input-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  width: 20px;
  height: 20px;
  pointer-events: none;
}

input[type="text"] {
  width: 100%;
  background: var(--bg-input);
  border: none;
  border-radius: 12px;
  padding: 16px 16px 16px 48px;
  color: var(--text-primary);
  font-size: 17px;
  font-family: var(--font-stack);
  transition: background 0.2s;
}

input[type="text"]:focus {
  outline: none;
  background: rgba(118, 118, 128, 0.35);
}

input[type="text"]::placeholder {
  color: var(--text-secondary);
}

/* Grid for Source Selection */
.source-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 12px;
}

.source-item {
  cursor: pointer;
  user-select: none;
}

.source-item input {
  display: none;
}

.source-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 16px 10px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-m);
  border: 1px solid transparent;
  transition: all 0.2s ease;
  height: 100%;
}

.source-card span {
  font-size: 14px;
  font-weight: 500;
  margin-top: 8px;
}

.source-item input:checked + .source-card {
  background: rgba(10, 132, 255, 0.15);
  border-color: var(--accent);
  color: var(--accent);
}

/* Buttons */
.btn-primary {
  background: var(--bg-button);
  color: white;
  border: none;
  border-radius: 12px;
  padding: 16px;
  width: 100%;
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  margin-top: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background 0.2s, transform 0.1s;
}

.btn-primary:hover {
  background: var(--bg-button-hover);
}

.btn-primary:active {
  transform: scale(0.98);
}

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

/* Player & Results */
.player-panel {
  display: none;
  animation: slideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.meta-row:last-child {
  border-bottom: none;
}

.meta-label {
  font-size: 15px;
  color: var(--text-secondary);
  font-weight: 500;
}

.meta-value {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  justify-content: flex-end;
  min-width: 0;
}

.meta-input {
  background: transparent;
  border: none;
  color: var(--text-primary);
  text-align: right;
  width: 100%;
  font-size: 15px;
  font-family: var(--font-stack);
  padding: 0;
}

.meta-input:focus {
  outline: none;
  background: transparent;
}

.action-link {
  color: var(--accent);
  font-size: 15px;
  text-decoration: none;
  font-weight: 500;
  white-space: nowrap;
}

.aplayer-container {
  margin: 24px 0;
  border-radius: var(--radius-m);
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

/* Utilities */
.hidden { display: none !important; }
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.error-msg {
  color: var(--danger);
  font-size: 14px;
  margin-top: 12px;
  text-align: center;
  display: block;
  min-height: 20px;
}

.footer {
  margin-top: 60px;
  text-align: center;
  color: var(--text-tertiary);
  font-size: 13px;
}

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

/* APlayer Dark Mode Overrides */
.aplayer {
  background: #1c1c1e !important;
  font-family: var(--font-stack) !important;
}
.aplayer .aplayer-info .aplayer-music .aplayer-title {
  color: #fff !important;
}
.aplayer .aplayer-info .aplayer-music .aplayer-author {
  color: rgba(255,255,255,0.6) !important;
}
.aplayer .aplayer-lrc:before, .aplayer .aplayer-lrc:after {
  background: linear-gradient(180deg, #1c1c1e 0%, rgba(28,28,30,0) 100%) !important;
}
.aplayer .aplayer-lrc:after {
  background: linear-gradient(180deg, rgba(28,28,30,0) 0%, #1c1c1e 100%) !important;
}
.aplayer .aplayer-lrc p {
  color: rgba(255,255,255,0.6) !important;
}
.aplayer .aplayer-lrc p.aplayer-lrc-current {
  color: var(--accent) !important;
}