/* ===== CSS VARIABLES (THEMES) ===== */
:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-header: #111827;
  --bg-card: #1e293b;
  --bg-input: #0f172a;
  --bg-hover: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #3b82f6;
  --border: #334155;
  --shadow: rgba(0,0,0,0.3);
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --transition: all 0.25s ease;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-header: #ffffff;
  --bg-card: #ffffff;
  --bg-input: #f1f5f9;
  --bg-hover: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #3b82f6;
  --border: #e2e8f0;
  --shadow: rgba(0,0,0,0.08);
  --success: #059669;
  --danger: #dc2626;
  --warning: #d97706;
}

/* ===== RESET & BASE ===== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  transition: var(--transition);
  line-height: 1.6;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--bg-hover);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ===== LOGIN PAGE ===== */
.login-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

.login-box {
  background: var(--bg-secondary);
  padding: 35px;
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 380px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: 0 10px 40px var(--shadow);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.login-box h1, .login-box h2 {
  text-align: center;
  margin-bottom: 10px;
  font-size: 1.5rem;
  font-weight: 700;
}

.login-box input {
  background: var(--bg-input);
  color: var(--text-primary);
  border: 2px solid var(--border);
  transition: var(--transition);
}

.login-box input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.login-box button {
  font-weight: 600;
  font-size: 15px;
  padding: 12px;
  transition: var(--transition);
}

.login-box button:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.login-box a {
  text-decoration: none;
}

.hint {
  font-size: 13px;
  opacity: 0.7;
  text-align: center;
  margin-top: 8px;
}

/* ===== HEADER ===== */
header {
  background: var(--bg-header);
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  transition: var(--transition);
}

header h1 {
  font-size: 1.4rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

/* Theme Toggle Button */
.theme-toggle {
  background: transparent !important;
  border: 2px solid var(--border) !important;
  color: var(--text-secondary) !important;
  padding: 8px 12px !important;
  font-size: 18px !important;
  border-radius: var(--radius-sm) !important;
  transition: var(--transition) !important;
}

.theme-toggle:hover {
  background: var(--bg-hover) !important;
  color: var(--text-primary) !important;
  transform: scale(1.05);
}

/* ===== TOOLBAR ===== */
.toolbar {
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.folder-tools, .upload-tools {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.toolbar input[type="text"] {
  background: var(--bg-input);
  color: var(--text-primary);
  border: 2px solid var(--border);
  min-width: 180px;
  transition: var(--transition);
}

.toolbar input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
}

.toolbar select {
  background: var(--bg-input);
  color: var(--text-primary);
  border: 2px solid var(--border);
  cursor: pointer;
  min-width: 140px;
  transition: var(--transition);
}

.toolbar input[type="file"] {
  background: var(--bg-input);
  color: var(--text-secondary);
  border: 2px dashed var(--border);
  padding: 10px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  max-width: 250px;
  transition: var(--transition);
}

.toolbar input[type="file"]:hover {
  border-color: var(--accent);
}

/* ===== FOLDER FILTERS ===== */
.folders {
  padding: 20px 24px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
  background: var(--bg-primary);
  transition: var(--transition);
}

.folder-filter {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 2px solid var(--border);
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}

.folder-filter:hover {
  background: var(--bg-hover);
  border-color: var(--accent-light);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.folder-filter.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

/* Folder item with actions */
.folder-item {
  background: var(--bg-secondary);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  display: flex;
  gap: 10px;
  align-items: center;
  border: 1px solid var(--border);
  transition: var(--transition);
}

.folder-item span {
  font-weight: 500;
  color: var(--text-primary);
}

.folder-item button {
  padding: 6px 10px;
  font-size: 12px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.folder-item button:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

/* ===== GALLERY ===== */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  padding: 24px;
  transition: var(--transition);
}

.empty-gallery {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
  font-size: 15px;
  grid-column: 1 / -1;
}

.empty-gallery-icon {
  font-size: 48px;
  margin-bottom: 16px;
  opacity: 0.5;
}

/* ===== CARD ===== */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px var(--shadow);
  border-color: var(--accent-light);
}

.card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: var(--transition);
}

.card:hover img {
  transform: scale(1.03);
}

.card-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.card-body b {
  font-size: 14px;
  color: var(--text-primary);
  word-break: break-word;
  line-height: 1.4;
}

.card-body small {
  color: var(--text-secondary);
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.card-body input {
  font-size: 11px;
  background: var(--bg-input);
  color: var(--text-secondary);
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  width: 100%;
  cursor: text;
  transition: var(--transition);
}

.card-body input:focus {
  outline: none;
  border-color: var(--accent);
  color: var(--text-primary);
}

/* Card Actions */
.card-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: auto;
  padding-top: 8px;
}

.card-actions button {
  padding: 8px;
  font-size: 12px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.card-actions button:first-child {
  background: var(--accent);
}

.card-actions button:first-child:hover {
  background: var(--accent-hover);
}

.card-actions button:nth-child(2) {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.card-actions button:nth-child(2):hover {
  background: var(--text-muted);
  color: white;
}

.card-actions button:last-child {
  grid-column: 1 / -1;
  background: transparent;
  border: 1px solid var(--danger);
  color: var(--danger);
}

.card-actions button:last-child:hover {
  background: var(--danger);
  color: white;
}

/* ===== BUTTONS ===== */
button {
  padding: 10px 16px;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: white;
  cursor: pointer;
  font-weight: 500;
  font-size: 14px;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

button:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

button:active {
  transform: translateY(0);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .gallery {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
    padding: 20px;
  }
}

@media (max-width: 768px) {
  header {
    padding: 12px 16px;
  }

  header h1 {
    font-size: 1.2rem;
  }

  .toolbar {
    padding: 16px;
    flex-direction: column;
    align-items: stretch;
  }

  .folder-tools, .upload-tools {
    width: 100%;
  }

  .folder-tools input, .upload-tools select {
    flex: 1;
  }

  .folders {
    padding: 16px;
  }

  .gallery {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    padding: 16px;
  }

  .card img {
    height: 160px;
  }

  .card-body {
    padding: 12px;
  }

  .login-box {
    padding: 24px;
    margin: 16px;
  }
}

@media (max-width: 480px) {
  .gallery {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 12px;
  }

  .card img {
    height: 220px;
  }

  .header-actions {
    width: 100%;
    justify-content: flex-end;
  }

  .toolbar input[type="file"] {
    max-width: 100%;
    width: 100%;
  }

  .folder-filter {
    padding: 6px 12px;
    font-size: 12px;
  }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.card {
  animation: fadeIn 0.3s ease-out;
}

/* ===== TOAST NOTIFICATION ===== */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 14px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  box-shadow: 0 8px 24px var(--shadow);
  z-index: 1000;
  animation: fadeIn 0.3s ease-out;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toast.success {
  border-left: 4px solid var(--success);
}


/* ===== FOLDER LIST SECTION ===== */
.folder-list-section {
  padding: 20px 24px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  margin-bottom: 10px;
}

.folder-list-section h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.folder-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.folder-list-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}

.folder-list-item:hover {
  border-color: var(--accent-light);
  transform: translateX(4px);
}

.folder-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.folder-icon {
  font-size: 20px;
}

.folder-name {
  font-weight: 500;
  font-size: 15px;
  color: var(--text-primary);
}

.folder-badge {
  background: var(--accent);
  color: white;
  font-size: 10px;
  padding: 3px 8px;
  border-radius: 10px;
  font-weight: 600;
  text-transform: uppercase;
}

.folder-actions {
  display: flex;
  gap: 8px;
}

.folder-actions button {
  padding: 8px 12px;
  font-size: 13px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.btn-rename {
  background: var(--bg-hover);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn-rename:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.btn-delete {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
}

.btn-delete:hover {
  background: var(--danger);
  color: white;
}

.btn-delete:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  border-color: var(--border);
  color: var(--text-muted);
}

.btn-delete:disabled:hover {
  background: transparent;
  color: var(--text-muted);
}

/* ===== RESPONSIVE FOLDER LIST ===== */
@media (max-width: 768px) {
  .folder-list-section {
    padding: 16px;
  }

  .folder-list-item {
    padding: 12px 14px;
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }

  .folder-actions {
    width: 100%;
    justify-content: flex-end;
  }
}

@media (max-width: 480px) {
  .folder-list-section {
    padding: 12px;
  }

  .folder-list-item {
    padding: 10px 12px;
  }

  .folder-name {
    font-size: 14px;
  }

  .folder-actions button {
    padding: 6px 10px;
    font-size: 12px;
  }
}