@import url('https://fonts.googleapis.com/css2?family=Circular+Std:wght@400;700&family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ===== RESET & VARIABLES ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --green: #1DB954;
  --green-hover: #1ed760;
  --bg: #121212;
  --bg-elevated: #181818;
  --bg-highlight: #282828;
  --bg-press: #3e3e3e;
  --text-primary: #ffffff;
  --text-secondary: #b3b3b3;
  --text-subdued: #6a6a6a;
  --radius: 8px;
  --radius-lg: 16px;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow: 0 8px 24px rgba(0,0,0,0.5);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.6);
}

html { scroll-behavior: smooth; }

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

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--bg-press); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-subdued); }

/* ===== SCREENS ===== */
.screen { display: none; min-height: 100vh; }
.screen.active { display: flex; }

/* ===== LOGIN SCREEN ===== */
#login-screen {
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: radial-gradient(ellipse at 50% 0%, rgba(29,185,84,0.15) 0%, transparent 60%),
              radial-gradient(ellipse at 80% 80%, rgba(29,185,84,0.08) 0%, transparent 50%),
              var(--bg);
  padding: 2rem;
  text-align: center;
}

.login-card {
  background: rgba(24, 24, 24, 0.8);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: 3rem 2.5rem;
  max-width: 480px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  animation: fadeInUp 0.6s ease;
}

.login-logo {
  width: 64px;
  height: 64px;
  margin: 0 auto 1.5rem;
}

.login-logo svg { width: 100%; height: 100%; }

.login-card h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, #fff 0%, var(--green) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.login-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 2rem;
  line-height: 1.6;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  text-align: left;
}

.input-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.input-group input {
  background: var(--bg-highlight);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  transition: var(--transition);
  width: 100%;
}

.input-group input:focus {
  outline: none;
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(29,185,84,0.15);
}

.input-group input::placeholder { color: var(--text-subdued); }

.btn-login {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  width: 100%;
  padding: 0.9rem 2rem;
  background: var(--green);
  color: #000;
  font-weight: 700;
  font-size: 0.95rem;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: var(--transition);
  letter-spacing: 0.02em;
}

.btn-login:hover { background: var(--green-hover); transform: scale(1.02); }
.btn-login:active { transform: scale(0.98); }
.btn-login svg { width: 20px; height: 20px; }

.setup-guide {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255,255,255,0.06);
  text-align: left;
}

.setup-guide h3 {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

.setup-steps { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; }

.setup-steps li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.step-num {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  background: var(--green);
  color: #000;
  border-radius: 50%;
  font-size: 0.7rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 1px;
}

.setup-steps a { color: var(--green); text-decoration: none; }
.setup-steps a:hover { text-decoration: underline; }

/* ===== APP SCREEN ===== */
#app-screen {
  flex-direction: column;
  background: var(--bg);
}

/* ===== NAVBAR ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 64px;
  background: rgba(18,18,18,0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}

.navbar-brand svg { width: 28px; height: 28px; }
.navbar-brand span { color: var(--text-primary); }
.navbar-brand span b { color: var(--green); }

/* ===== HERO SECTION ===== */
.hero-section {
  position: relative;
  padding: 6rem 2rem 3rem;
  display: flex;
  align-items: flex-end;
  gap: 2rem;
  overflow: hidden;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(29, 185, 84, 0.2) 0%, var(--bg) 100%);
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: flex-end;
  gap: 2rem;
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
}

.hero-avatar {
  width: 192px;
  height: 192px;
  border-radius: 50%;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  flex-shrink: 0;
  background: var(--bg-highlight);
  position: relative;
}

.hero-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.skeleton-avatar {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--bg-highlight) 25%, var(--bg-press) 50%, var(--bg-highlight) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

.hero-info {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
}

.hero-badge {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-primary);
}

.hero-title {
  font-size: clamp(3rem, 5vw, 6rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: 0.5rem;
}

.hero-stats {
  font-size: 1rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 1rem;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 2rem;
  background: var(--green);
  color: #000;
  font-size: 0.875rem;
  font-weight: 700;
  border-radius: 50px;
  text-decoration: none;
  transition: var(--transition);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.btn-primary:hover {
  background: var(--green-hover);
  transform: scale(1.04);
}

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

/* ===== MAIN CONTENT ===== */
.main-content { padding: 2rem; max-width: 1400px; margin: 0 auto; width: 100%; }

.content-header {
  margin-bottom: 2rem;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.content-header h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.content-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.content-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.search-box {
  position: relative;
  width: 250px;
}

.search-box input {
  width: 100%;
  background: var(--bg-elevated);
  border: 1px solid transparent;
  border-radius: 50px;
  padding: 0.6rem 1rem 0.6rem 2.5rem;
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 0.875rem;
  transition: var(--transition);
}

.search-box input:focus {
  outline: none;
  background: var(--bg-highlight);
  border-color: rgba(255,255,255,0.1);
}

.search-icon {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  width: 16px;
  height: 16px;
  pointer-events: none;
}

.playlist-count {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ===== PLAYLIST GRID ===== */
.playlist-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 1.25rem;
}

.playlist-card {
  background: var(--bg-elevated);
  border-radius: var(--radius);
  padding: 1rem;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.playlist-card:hover {
  background: var(--bg-highlight);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.playlist-card-cover {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 1rem;
  background: var(--bg-highlight);
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
}

.playlist-card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.playlist-card:hover .playlist-card-cover img { transform: scale(1.05); }

.cover-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-highlight) 0%, var(--bg-press) 100%);
  color: var(--text-subdued);
}

.cover-placeholder svg { width: 40%; height: 40%; }

.play-btn {
  position: absolute;
  bottom: 0.75rem;
  right: 0.75rem;
  width: 44px;
  height: 44px;
  background: var(--green);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(8px);
  transition: var(--transition);
  box-shadow: 0 8px 16px rgba(0,0,0,0.4);
}

.playlist-card:hover .play-btn { opacity: 1; transform: translateY(0); }
.play-btn:hover { transform: scale(1.06) !important; background: var(--green-hover); }
.play-btn svg { width: 20px; height: 20px; fill: #000; margin-left: 2px; }

.playlist-card-name {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 0.25rem;
}

.playlist-card-meta {
  font-size: 0.8rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ===== LOADING ===== */
.loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 6rem 2rem;
  gap: 1.5rem;
  color: var(--text-secondary);
}

.spinner {
  width: 48px;
  height: 48px;
  border: 3px solid rgba(255,255,255,0.08);
  border-top-color: var(--green);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.skeleton-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 1.25rem;
}

.skeleton-card { background: var(--bg-elevated); border-radius: var(--radius); padding: 1rem; }

.skeleton-cover {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 6px;
  background: var(--bg-highlight);
  margin-bottom: 1rem;
  animation: shimmer 1.5s infinite;
  background: linear-gradient(90deg, var(--bg-highlight) 25%, var(--bg-press) 50%, var(--bg-highlight) 75%);
  background-size: 200% 100%;
}

.skeleton-line {
  height: 12px;
  border-radius: 6px;
  margin-bottom: 0.5rem;
  animation: shimmer 1.5s infinite;
  background: linear-gradient(90deg, var(--bg-highlight) 25%, var(--bg-press) 50%, var(--bg-highlight) 75%);
  background-size: 200% 100%;
}

.skeleton-line.short { width: 60%; }

/* ===== EMPTY STATE ===== */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 6rem 2rem;
  text-align: center;
  color: var(--text-secondary);
}

.empty-state svg { width: 80px; height: 80px; opacity: 0.3; margin-bottom: 1.5rem; }
.empty-state h3 { font-size: 1.25rem; color: var(--text-primary); margin-bottom: 0.5rem; }
.empty-state p { font-size: 0.9rem; }

/* ===== MODAL ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0,0,0,0.8);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.modal-overlay.open { opacity: 1; pointer-events: all; }

.modal {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  width: 100%;
  max-width: 640px;
  max-height: 85vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transform: translateY(40px);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 -8px 48px rgba(0,0,0,0.6);
}

.modal-overlay.open .modal { transform: translateY(0); }

.modal-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  position: relative;
}

.modal-cover {
  width: 72px;
  height: 72px;
  border-radius: 6px;
  overflow: hidden;
  flex-shrink: 0;
  background: var(--bg-highlight);
}

.modal-cover img { width: 100%; height: 100%; object-fit: cover; }

.modal-info { flex: 1; min-width: 0; }
.modal-playlist-label { font-size: 0.7rem; font-weight: 700; color: var(--green); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 0.25rem; }
.modal-playlist-name { font-size: 1.25rem; font-weight: 800; color: var(--text-primary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-bottom: 0.25rem; }
.modal-playlist-meta { font-size: 0.8rem; color: var(--text-secondary); }

.modal-actions { display: flex; align-items: center; gap: 0.5rem; margin-left: auto; flex-shrink: 0; }

.btn-open-spotify {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  background: var(--green);
  color: #000;
  font-size: 0.8rem;
  font-weight: 700;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-open-spotify:hover { background: var(--green-hover); }
.btn-open-spotify svg { width: 14px; height: 14px; }

.btn-close-modal {
  width: 36px;
  height: 36px;
  background: var(--bg-highlight);
  border: none;
  border-radius: 50%;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.btn-close-modal:hover { background: var(--bg-press); color: var(--text-primary); }
.btn-close-modal svg { width: 18px; height: 18px; }

/* ===== TRACK LIST ===== */
.track-list {
  overflow-y: auto;
  flex: 1;
  padding: 0.5rem 0;
}

.track-item {
  display: grid;
  grid-template-columns: 32px 1fr auto;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 1.5rem;
  border-radius: var(--radius);
  transition: var(--transition);
}

.track-item:hover { background: rgba(255,255,255,0.05); }

.track-num {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

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

.track-name {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.track-artist {
  font-size: 0.8rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.track-duration {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}

.track-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem;
  gap: 1rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.track-loading .spinner { width: 24px; height: 24px; }

/* ===== TOAST ===== */
.toast-container {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  align-items: center;
}

.toast {
  background: var(--bg-elevated);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 50px;
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  box-shadow: var(--shadow);
  animation: toastIn 0.3s ease, toastOut 0.3s ease 2.7s forwards;
  white-space: nowrap;
}

.toast.error { border-color: rgba(220, 50, 50, 0.4); color: #ff6b6b; }
.toast.success { border-color: rgba(29,185,84,0.4); color: var(--green); }

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

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

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateY(0); }
  to { opacity: 0; transform: translateY(10px); }
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(16px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.playlist-card { animation: cardIn 0.3s ease both; }

/* ===== FILTER TABS ===== */
.filter-bar {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
  flex-wrap: wrap;
}

.filter-chip {
  padding: 0.35rem 0.9rem;
  background: var(--bg-elevated);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  font-family: 'Inter', sans-serif;
}

.filter-chip:hover { background: var(--bg-highlight); color: var(--text-primary); }
.filter-chip.active { background: var(--text-primary); color: var(--bg); border-color: var(--text-primary); }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .hero-section { padding: 4rem 1.5rem 2rem; }
  .hero-content { flex-direction: column; align-items: center; text-align: center; gap: 1.5rem; }
  .hero-avatar { width: 140px; height: 140px; }
  .hero-info { align-items: center; }
  .main-content { padding: 1.5rem; }
  .content-header { flex-direction: column; align-items: flex-start; gap: 1rem; }
  .search-box { width: 100%; }
  .playlist-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 1rem; }
  .modal-overlay { align-items: flex-end; padding: 0; }
  .modal { border-radius: var(--radius-lg) var(--radius-lg) 0 0; max-height: 90vh; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 2.5rem; }
  .playlist-grid { grid-template-columns: repeat(2, 1fr); }
}