/* ========== CSS Variables & Reset ========== */
:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.7);
  --bg-card-hover: rgba(30, 41, 59, 0.8);
  --bg-glass: rgba(255, 255, 255, 0.04);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-active: rgba(99, 102, 241, 0.4);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.25);
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.2);
  --warning: #f59e0b;
  --danger: #ef4444;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

/* ========== Background Gradient ========== */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(99, 102, 241, 0.12) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 50%, rgba(16, 185, 129, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse 50% 40% at 20% 80%, rgba(236, 72, 153, 0.06) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* ========== Layout ========== */
.app-container {
  position: relative;
  z-index: 1;
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* ========== Header ========== */
.app-header {
  text-align: center;
  margin-bottom: 2.5rem;
  animation: fadeSlideDown 0.6s ease-out;
}

.app-header h1 {
  font-size: 2.2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-light), #a78bfa, #ec4899);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.app-header p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.api-config {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  margin-top: 0.5rem;
}

.api-config label {
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
}

.api-base-input {
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border-glass);
  color: var(--text-primary);
  font-family: monospace;
  font-size: 0.85rem;
  padding: 0.2rem 0;
  width: 150px;
  outline: none;
  transition: border-color var(--transition);
}

.api-base-input:focus {
  border-color: var(--accent-light);
}

/* ========== Search Section ========== */
.search-section {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 2rem;
  animation: fadeSlideDown 0.6s ease-out 0.1s both;
}

.search-input-wrapper {
  flex: 1;
  position: relative;
}

.search-input-wrapper .search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1.1rem;
  pointer-events: none;
  transition: color var(--transition);
}

.search-input {
  width: 100%;
  padding: 0.85rem 1rem 0.85rem 2.8rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: var(--font-sans);
  outline: none;
  transition: all var(--transition);
  backdrop-filter: blur(12px);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-input:focus {
  border-color: var(--border-active);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.search-input:focus ~ .search-icon {
  color: var(--accent-light);
}

.episode-input {
  width: 100px;
  padding: 0.85rem 1rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: var(--font-sans);
  outline: none;
  transition: all var(--transition);
  backdrop-filter: blur(12px);
  text-align: center;
}

.episode-input::placeholder {
  color: var(--text-muted);
}

.episode-input:focus {
  border-color: var(--border-active);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.search-btn {
  padding: 0.85rem 1.8rem;
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  border: none;
  border-radius: var(--radius-md);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.search-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.search-btn:hover::before {
  opacity: 1;
}

.search-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--accent-glow);
}

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

.search-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* ========== Status Messages ========== */
.status-bar {
  text-align: center;
  margin-bottom: 1.5rem;
  min-height: 1.5rem;
}

.status-bar .loading {
  color: var(--accent-light);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.status-bar .loading .spinner {
  width: 16px;
  height: 16px;
  border: 2px solid var(--accent-glow);
  border-top-color: var(--accent-light);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.status-bar .error {
  color: var(--danger);
  font-size: 0.9rem;
}

.status-bar .info {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ========== Results ========== */
.results-container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* ========== Anime Card ========== */
.anime-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: blur(16px);
  transition: all var(--transition);
  animation: fadeSlideUp 0.4s ease-out both;
}

.anime-card:hover {
  border-color: var(--border-active);
  box-shadow: var(--shadow-md);
}

.anime-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 1.5rem;
  cursor: pointer;
  transition: background var(--transition);
  user-select: none;
}

.anime-card-header:hover {
  background: var(--bg-card-hover);
}

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

.anime-card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.3rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.anime-card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.anime-card-meta .type-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.6rem;
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent-light);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 500;
}

.anime-card-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.btn-download-all {
  padding: 0.45rem 1rem;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: var(--radius-sm);
  color: var(--success);
  font-size: 0.82rem;
  font-weight: 500;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-download-all:hover {
  background: rgba(16, 185, 129, 0.2);
  box-shadow: 0 0 12px var(--success-glow);
}

.btn-download-all:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.expand-arrow {
  color: var(--text-muted);
  transition: transform var(--transition);
  font-size: 1.2rem;
  flex-shrink: 0;
}

.anime-card.expanded .expand-arrow {
  transform: rotate(180deg);
}

/* ========== Episode List ========== */
.episode-list {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.anime-card.expanded .episode-list {
  max-height: 2000px;
}

.episode-list-inner {
  padding: 0 1.5rem 1.2rem;
  border-top: 1px solid var(--border-glass);
}

/* Select-all row */
.select-all-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.65rem 0.75rem 0.3rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}

.select-all-row:hover {
  color: var(--text-secondary);
}

/* Custom checkbox */
.ep-checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border: 1.5px solid var(--text-muted);
  border-radius: 4px;
  background: transparent;
  cursor: pointer;
  flex-shrink: 0;
  transition: all var(--transition);
  position: relative;
}

.ep-checkbox:checked {
  background: var(--accent);
  border-color: var(--accent);
}

.ep-checkbox:checked::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
}

.ep-checkbox:indeterminate {
  background: var(--accent);
  border-color: var(--accent);
}

.ep-checkbox:indeterminate::after {
  content: '–';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  line-height: 1;
}

.ep-checkbox:hover {
  border-color: var(--accent-light);
}

/* Download selected button */
.btn-download-selected {
  padding: 0.45rem 1rem;
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-radius: var(--radius-sm);
  color: var(--warning);
  font-size: 0.82rem;
  font-weight: 500;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-download-selected:hover {
  background: rgba(245, 158, 11, 0.22);
  box-shadow: 0 0 12px rgba(245, 158, 11, 0.15);
}

.btn-download-selected:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}



.episode-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.7rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
  gap: 1rem;
}

.episode-item:hover {
  background: var(--bg-glass);
}

.episode-item + .episode-item {
  border-top: 1px solid rgba(255, 255, 255, 0.03);
}

.episode-title {
  font-size: 0.9rem;
  color: var(--text-secondary);
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.btn-download {
  padding: 0.35rem 0.85rem;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: var(--radius-sm);
  color: var(--accent-light);
  font-size: 0.8rem;
  font-weight: 500;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  flex-shrink: 0;
}

.btn-download:hover {
  background: rgba(99, 102, 241, 0.2);
  box-shadow: 0 0 10px var(--accent-glow);
}

.btn-download:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-download.success {
  background: rgba(16, 185, 129, 0.12);
  border-color: rgba(16, 185, 129, 0.3);
  color: var(--success);
}

.btn-download.error {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.3);
  color: var(--danger);
}

/* ========== Download Progress ========== */
.download-progress {
  padding: 0.6rem 1.5rem 1rem;
  border-top: 1px solid var(--border-glass);
}

.progress-bar-bg {
  width: 100%;
  height: 4px;
  background: var(--bg-glass);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 0.4rem;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--success));
  border-radius: 999px;
  transition: width 0.3s ease;
  width: 0%;
}

.progress-text {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-align: center;
}

/* ========== Empty State ========== */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}

.empty-state .icon {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.empty-state h3 {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

.empty-state p {
  font-size: 0.88rem;
}


/* ========== Toast ========== */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 9999;
  display: flex;
  flex-direction: column-reverse;
  gap: 0.5rem;
}

.toast {
  padding: 0.8rem 1.2rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.88rem;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-lg);
  animation: toastIn 0.3s ease-out;
  max-width: 350px;
}

.toast.success {
  border-color: rgba(16, 185, 129, 0.3);
}

.toast.error {
  border-color: rgba(239, 68, 68, 0.3);
}

.toast.fade-out {
  animation: toastOut 0.3s ease-in forwards;
}

/* ========== Animations ========== */
@keyframes fadeSlideDown {
  from { opacity: 0; transform: translateY(-16px); }
  to { opacity: 1; transform: translateY(0); }
}

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

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

@keyframes toastIn {
  from { opacity: 0; transform: translateX(40px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateX(0); }
  to { opacity: 0; transform: translateX(40px); }
}

/* ========== Responsive ========== */
@media (max-width: 640px) {
  .app-container {
    padding: 1.5rem 1rem 3rem;
  }

  .app-header h1 {
    font-size: 1.6rem;
  }

  .search-section {
    flex-wrap: wrap;
  }

  .search-input-wrapper {
    flex: 1 1 100%;
  }

  .episode-input {
    flex: 1;
  }

  .search-btn {
    flex: 1;
  }

  .anime-card-header {
    padding: 1rem 1.2rem;
  }

  .anime-card-title {
    font-size: 0.95rem;
  }

  .episode-list-inner {
    padding: 0 1rem 1rem;
  }

  .toast-container {
    bottom: 1rem;
    right: 1rem;
    left: 1rem;
  }

  .toast {
    max-width: none;
  }
}