:root {
  --bg-primary: #0f1117;
  --bg-card: #181b23;
  --bg-input: #212632;
  --bg-input-hover: #293040;
  --border-color: #2e3547;
  --border-highlight: #4f46e5;
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --primary-accent: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.25);
  --success: #10b981;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --danger-bg: rgba(239, 68, 68, 0.15);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  overflow-x: hidden;
}

/* ==========================================================================
   Left Drawer Navigation & Backdrop
   ========================================================================== */
.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.drawer-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.app-drawer {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 290px;
  max-width: 85vw;
  background: var(--bg-card);
  border-right: 1px solid var(--border-color);
  z-index: 101;
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 8px 0 30px rgba(0, 0, 0, 0.5);
}

.app-drawer.open {
  transform: translateX(0);
}

.drawer-header {
  padding: 1.25rem 1.25rem 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.drawer-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.drawer-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #6366f1, #a855f7);
  border-radius: var(--radius-sm);
  display: grid;
  place-items: center;
  font-size: 1.25rem;
  color: #fff;
  box-shadow: 0 4px 12px var(--primary-glow);
}

.drawer-title h2 {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.drawer-title span {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.btn-close-drawer {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.35rem;
  cursor: pointer;
  padding: 0.3rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.btn-close-drawer:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.08);
}

.drawer-body {
  flex: 1;
  padding: 1.25rem 1rem;
  overflow-y: auto;
}

.drawer-section-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  padding-left: 0.5rem;
}

.drawer-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.drawer-nav-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0.85rem;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
  cursor: pointer;
}

.drawer-nav-item:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
}

.drawer-nav-item.active {
  background: rgba(99, 102, 241, 0.18);
  color: #a5b4fc;
  font-weight: 600;
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.nav-item-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-item-icon {
  font-size: 1.15rem;
}

.nav-pill-soon {
  background: rgba(156, 163, 175, 0.15);
  color: #9ca3af;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 9999px;
  border: 1px solid rgba(156, 163, 175, 0.25);
}

/* ==========================================================================
   Header & Burger Button
   ========================================================================== */
.app-header {
  border-bottom: 1px solid var(--border-color);
  background: rgba(15, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 0.75rem 1.25rem;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.btn-burger {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: grid;
  place-items: center;
  font-size: 1.25rem;
  cursor: pointer;
  transition: var(--transition);
}

.btn-burger:hover {
  background: var(--bg-input-hover);
  border-color: #4b5563;
}

.logo-group {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: inherit;
}

.logo-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, #6366f1, #a855f7);
  border-radius: var(--radius-sm);
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 1.15rem;
  box-shadow: 0 4px 12px var(--primary-glow);
}

.logo-text h1 {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.logo-text span {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Main Generator Layout
   ========================================================================== */
.app-main {
  max-width: 1200px;
  width: 100%;
  margin: 1.5rem auto;
  padding: 0 1rem;
  flex: 1;
}

.grid-workspace {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 900px) {
  .grid-workspace {
    grid-template-columns: 1fr;
  }
}

.card-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Form Controls */
.form-group {
  margin-bottom: 1rem;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.textarea-field {
  width: 100%;
  min-height: 110px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.95rem;
  resize: vertical;
  transition: var(--transition);
}

.textarea-field:focus {
  outline: none;
  border-color: var(--border-highlight);
  box-shadow: 0 0 0 3px var(--primary-glow);
  background: var(--bg-input-hover);
}

/* ==========================================================================
   Expandable Panels (Art Style, Ratio, Negative Prompt)
   ========================================================================== */
.expandable-panel {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.85rem;
  margin-bottom: 0.75rem;
  transition: var(--transition);
}

.expandable-panel[open] {
  border-color: #4b5563;
  background: var(--bg-input-hover);
}

.expandable-summary {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  user-select: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
}

.expandable-summary::-webkit-details-marker {
  display: none;
}

.expandable-summary::after {
  content: "▾";
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: transform 0.2s ease;
}

.expandable-panel[open] .expandable-summary::after {
  transform: rotate(180deg);
}

.expandable-badge {
  font-size: 0.75rem;
  color: #a5b4fc;
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.25);
  padding: 0.15rem 0.5rem;
  border-radius: 9999px;
  font-weight: 500;
  margin-left: auto;
  margin-right: 0.75rem;
}

.expandable-content {
  padding-top: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 0.65rem;
}

/* Style Selector Chips inside expandable */
.style-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(95px, 1fr));
  gap: 0.5rem;
}

.style-chip {
  cursor: pointer;
}

.style-chip input {
  display: none;
}

.chip-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.4rem;
  font-size: 0.8rem;
  text-align: center;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  user-select: none;
}

.chip-icon {
  font-size: 1.15rem;
}

.style-chip input:checked + .chip-content {
  background: rgba(99, 102, 241, 0.2);
  border-color: var(--primary-accent);
  color: #fff;
  font-weight: 600;
  box-shadow: 0 0 10px var(--primary-glow);
}

.chip-content:hover {
  border-color: #6366f1;
}

/* Aspect Ratio Buttons inside expandable */
.aspect-selector {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}

.aspect-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  padding: 0.6rem 0.5rem;
  font-size: 0.82rem;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  transition: var(--transition);
}

.aspect-btn.active {
  background: rgba(99, 102, 241, 0.2);
  border-color: var(--primary-accent);
  color: #fff;
  font-weight: 600;
}

.aspect-btn:hover:not(.active) {
  border-color: #4b5563;
}

/* Generate CTA */
.btn-generate {
  width: 100%;
  padding: 0.95rem;
  margin-top: 0.75rem;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  border: none;
  border-radius: var(--radius-md);
  color: #ffffff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  box-shadow: 0 6px 20px var(--primary-glow);
  transition: var(--transition);
}

.btn-generate:hover:not(:disabled) {
  filter: brightness(1.1);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px var(--primary-glow);
}

.btn-generate:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ==========================================================================
   Output Canvas & Right-Aligned Icon Actions
   ========================================================================== */
.preview-container {
  width: 100%;
  min-height: 380px;
  background: var(--bg-input);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

.preview-container.has-image {
  border-style: solid;
  border-color: transparent;
  background: #000;
}

.preview-image {
  width: 100%;
  height: 100%;
  max-height: 520px;
  object-fit: contain;
  display: none;
  animation: fadeIn 0.4s ease forwards;
}

.placeholder-view {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
}

.placeholder-icon {
  font-size: 3rem;
  margin-bottom: 0.75rem;
  opacity: 0.5;
}

/* Loading Overlay with Cancel Button */
.loading-overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 17, 23, 0.88);
  backdrop-filter: blur(8px);
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  z-index: 10;
  padding: 1rem;
}

.spinner {
  width: 44px;
  height: 44px;
  border: 3px solid rgba(99, 102, 241, 0.2);
  border-top-color: var(--primary-accent);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}

.loading-text {
  font-size: 0.95rem;
  color: var(--text-main);
  font-weight: 500;
  text-align: center;
}

.loading-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.btn-cancel-gen {
  margin-top: 0.5rem;
  padding: 0.35rem 0.85rem;
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.35);
  color: #fca5a5;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  cursor: pointer;
  transition: var(--transition);
}

.btn-cancel-gen:hover {
  background: var(--danger);
  color: #fff;
}

/* Right-aligned Icon Action Toolbar at bottom of preview */
.action-toolbar-right {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.btn-icon-action {
  width: 44px;
  height: 44px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 1.25rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.btn-icon-action:hover:not(:disabled) {
  background: var(--bg-input-hover);
  border-color: var(--primary-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--primary-glow);
}

.btn-icon-action:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.btn-icon-action.saved-success {
  background: #047857;
  border-color: #10b981;
  color: #ffffff;
  pointer-events: none;
}

/* ==========================================================================
   Saved Session Gallery Section
   ========================================================================== */
.history-section {
  max-width: 1200px;
  margin: 2rem auto 3.5rem auto;
  padding: 0 1rem;
}

.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.history-header h2 {
  font-size: 1.15rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.saved-count-badge {
  background: rgba(99, 102, 241, 0.2);
  color: #a5b4fc;
  font-size: 0.75rem;
  padding: 0.15rem 0.55rem;
  border-radius: 9999px;
  font-weight: 600;
}

.history-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.history-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.25rem;
}

@media (max-width: 600px) {
  .history-grid {
    grid-template-columns: 1fr;
  }
}

.session-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}

.session-card:hover {
  border-color: rgba(99, 102, 241, 0.5);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.session-thumb-wrapper {
  position: relative;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background: #000;
  cursor: pointer;
}

.session-thumb-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.session-thumb-wrapper:hover img {
  transform: scale(1.05);
}

.session-zoom-pill {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  color: #fff;
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  opacity: 0;
  transition: var(--transition);
  pointer-events: none;
}

.session-thumb-wrapper:hover .session-zoom-pill {
  opacity: 1;
}

.session-details {
  padding: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  flex: 1;
}

.session-prompt-text {
  font-size: 0.85rem;
  color: var(--text-main);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  min-height: 2.4em;
}

.session-item-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin-top: auto;
  padding-top: 0.4rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.btn-item-download {
  padding: 0.55rem;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  transition: var(--transition);
  text-decoration: none;
}

.btn-item-download:hover {
  background: rgba(99, 102, 241, 0.15);
  border-color: var(--primary-accent);
  color: #a5b4fc;
}

.btn-item-delete {
  padding: 0.55rem;
  background: var(--danger-bg);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-sm);
  color: #fca5a5;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  transition: var(--transition);
}

.btn-item-delete:hover {
  background: var(--danger);
  border-color: var(--danger);
  color: #ffffff;
}

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

@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.98); }
  to { opacity: 1; transform: scale(1); }
}

/* ==========================================================================
   Login Access Gate Screen
   ========================================================================== */
.login-overlay {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at 50% 20%, #1e1b4b 0%, #0f1117 70%);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
}

.login-card {
  width: 100%;
  max-width: 380px;
  background: rgba(24, 27, 35, 0.95);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem 2rem;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(12px);
  text-align: center;
  animation: fadeIn 0.3s ease forwards;
}

.login-icon {
  width: 58px;
  height: 58px;
  background: linear-gradient(135deg, #6366f1, #a855f7);
  border-radius: var(--radius-md);
  margin: 0 auto 1.25rem auto;
  display: grid;
  place-items: center;
  font-size: 2rem;
  box-shadow: 0 6px 20px var(--primary-glow);
}

.login-card h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
  letter-spacing: -0.01em;
}

.login-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.75rem;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  text-align: left;
}

.input-auth {
  width: 100%;
  height: 44px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0 1rem;
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.92rem;
  transition: var(--transition);
}

.input-auth:focus {
  outline: none;
  border-color: var(--border-highlight);
  box-shadow: 0 0 0 3px var(--primary-glow);
  background: var(--bg-input-hover);
}

.login-error-msg {
  display: none;
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.35);
  color: #fca5a5;
  font-size: 0.82rem;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-sm);
  text-align: center;
}

.btn-login-submit {
  width: 100%;
  height: 44px;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  border: none;
  border-radius: var(--radius-sm);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: var(--transition);
  box-shadow: 0 4px 14px var(--primary-glow);
  margin-top: 0.25rem;
}

.btn-login-submit:hover:not(:disabled) {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

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

.drawer-signout-item {
  color: #fca5a5 !important;
}

.drawer-signout-item:hover {
  background: rgba(239, 68, 68, 0.15) !important;
  color: #f87171 !important;
}

/* Mobile responsive fine-tuning */
@media (max-width: 600px) {
  .card-panel {
    padding: 1.15rem;
  }
}