/* ==========================================================================
   Design Tokens & Variables
   ========================================================================== */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f6f7f8;
  --bg-card: #ffffff;
  --bg-surface: #f3f4f6;
  --bg-surface-hover: #e5e7eb;

  --text-primary: #111827;
  --text-secondary: #4b5563;
  --text-muted: #6b7280;
  --text-placeholder: #9ca3af;

  --border-color: #e5e7eb;
  --border-strong: #d1d5db;

  /* Fal / MiniMax Green Aesthetic */
  --accent-primary: #004012;
  --accent-hover: #00300d;
  --accent-soft: #f1ffd2;
  --accent-border: #004012;
  --accent-text: #004012;
  --accent-glow: rgba(0, 64, 18, 0.15);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Plus Jakarta Sans', var(--font-sans);
}

[data-theme="dark"] {
  --bg-primary: #0f1115;
  --bg-secondary: #16181d;
  --bg-card: #1b1e24;
  --bg-surface: #22262f;
  --bg-surface-hover: #2d323e;

  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --text-placeholder: #4b5563;

  --border-color: #2a2f3b;
  --border-strong: #3b4252;

  --accent-primary: #22c55e;
  --accent-hover: #16a34a;
  --accent-soft: rgba(34, 197, 94, 0.15);
  --accent-border: #22c55e;
  --accent-text: #4ade80;
  --accent-glow: rgba(34, 197, 94, 0.25);
}

/* ==========================================================================
   Reset & Global Styles
   ========================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  transition: background-color 0.25s ease, color 0.25s ease;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.hidden {
  display: none !important;
}

.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ==========================================================================
   Navigation Bar
   ========================================================================== */
.navbar {
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-card);
  position: sticky;
  top: 0;
  z-index: 40;
}

.nav-left {
  display: flex;
  align-items: center;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--text-primary);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 24px;
  height: 24px;
  color: var(--accent-text);
}

.brand-text span {
  font-weight: 800;
  color: var(--accent-text);
}

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

.nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.75rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.nav-btn:hover {
  background-color: var(--bg-surface-hover);
  border-color: var(--border-strong);
}

.nav-btn svg {
  width: 17px;
  height: 17px;
}

.settings-pill {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-full);
}

.settings-pill.badge-free {
  background: var(--bg-surface-hover);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.settings-pill.badge-active {
  background: var(--accent-soft);
  color: var(--accent-text);
  border: 1px solid var(--accent-border);
}

.theme-icon-moon {
  display: none;
}

[data-theme="dark"] .theme-icon-sun {
  display: none;
}

[data-theme="dark"] .theme-icon-moon {
  display: inline-block;
}

/* ==========================================================================
   Main Wrapper & Hero Section
   ========================================================================== */
.main-wrapper {
  flex: 1;
  max-width: 880px;
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
  display: flex;
  flex-direction: column;
}

.hero-section {
  text-align: center;
  margin-bottom: 2rem;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.accent-text {
  color: var(--accent-text);
}

.hero-subtitle {
  margin-top: 0.75rem;
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 620px;
  margin-left: auto;
  margin-right: auto;
}

/* ==========================================================================
   Generator Card
   ========================================================================== */
.generator-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.generator-card:focus-within {
  border-color: var(--accent-border);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.prompt-container {
  padding: 1rem 1.25rem 0.5rem;
}

.prompt-textarea {
  width: 100%;
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1.05rem;
  line-height: 1.5;
  resize: none;
  outline: none;
  min-height: 70px;
}

.prompt-textarea::placeholder {
  color: var(--text-placeholder);
}

/* Image Preview in Prompt Box */
.image-preview-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.5rem;
  padding: 0.5rem;
  background: var(--bg-surface);
  border-radius: var(--radius-sm);
  width: fit-content;
}

.image-preview-box {
  position: relative;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.image-preview-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.remove-img-btn {
  position: absolute;
  top: 2px;
  right: 2px;
  width: 18px;
  height: 18px;
  background: rgba(0, 0, 0, 0.7);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.img-filename {
  font-size: 0.8rem;
  color: var(--text-secondary);
  max-width: 180px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Toolbar Controls */
.toolbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-card);
  flex-wrap: wrap;
  gap: 0.75rem;
}

.toolbar-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.btn-tool {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.85rem;
  border: 1px dashed var(--border-strong);
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-tool:hover {
  background-color: var(--bg-surface-hover);
  border-color: var(--text-primary);
}

.btn-tool svg {
  width: 15px;
  height: 15px;
}

.ratio-group {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.ratio-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.85rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.ratio-btn:hover {
  background-color: var(--bg-surface);
}

.ratio-btn.active {
  border-color: var(--accent-border);
  background-color: var(--accent-soft);
  color: var(--accent-text);
}

.ratio-rect {
  display: inline-block;
  border: 1.5px solid currentColor;
  border-radius: 1.5px;
}

.r-16-9 { width: 14px; height: 8px; }
.r-9-16 { width: 8px; height: 14px; }
.r-1-1  { width: 11px; height: 11px; }

.btn-generate {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.75rem;
  background-color: var(--accent-primary);
  color: #ffffff;
  border: 1px solid var(--accent-primary);
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
  min-width: 120px;
}

.btn-generate:hover:not(:disabled) {
  opacity: 0.92;
  transform: translateY(-1px);
}

.btn-generate:active:not(:disabled) {
  transform: translateY(0);
}

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

.btn-spinner {
  width: 18px;
  height: 18px;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ==========================================================================
   Prompt Suggestions
   ========================================================================== */
.suggestions-container {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.suggestion-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}

.chip-prompt {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.chip-prompt:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

/* ==========================================================================
   Video Output Display Area
   ========================================================================== */
.output-container {
  margin-top: 1.5rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  min-height: 380px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Placeholder State */
.state-placeholder {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1.5rem;
  text-align: center;
}

.placeholder-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.placeholder-icon-wrap svg {
  width: 22px;
  height: 22px;
  margin-left: 2px;
}

.placeholder-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.placeholder-desc {
  margin-top: 0.35rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  max-width: 420px;
}

/* Loading State */
.state-loading {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1.5rem;
  text-align: center;
}

.loader-pulse {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border-color);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.9s ease-in-out infinite;
  margin-bottom: 1.25rem;
}

.loading-status {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.loading-hint {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
  margin-bottom: 1.5rem;
}

.progress-bar-wrap {
  width: 240px;
  height: 6px;
  background: var(--bg-surface-hover);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-inner {
  height: 100%;
  width: 35%;
  background: var(--accent-primary);
  border-radius: var(--radius-full);
  animation: progressPulse 2s ease-in-out infinite;
}

@keyframes progressPulse {
  0% { transform: translateX(-100%); }
  50% { transform: translateX(100%); }
  100% { transform: translateX(300%); }
}

/* Video Ready State */
.state-video {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
}

.video-player-wrapper {
  position: relative;
  width: 100%;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  max-height: 520px;
}

.video-player-wrapper video {
  width: 100%;
  max-height: 520px;
  object-fit: contain;
  display: block;
}

.video-actions-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.25rem;
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 0.75rem;
}

.video-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  overflow: hidden;
}

.video-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  background: var(--accent-soft);
  color: var(--accent-text);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.video-prompt-preview {
  font-size: 0.85rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 380px;
}

.video-buttons {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-action {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 0.9rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-action:hover {
  background: var(--bg-surface-hover);
  border-color: var(--border-strong);
}

.btn-action.icon-only {
  padding: 0.5rem;
}

.btn-action svg {
  width: 16px;
  height: 16px;
}

/* ==========================================================================
   History Section
   ========================================================================== */
.history-section {
  margin-top: 3rem;
}

.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.history-header h2 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
}

.btn-text-only {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.85rem;
  cursor: pointer;
}

.btn-text-only:hover {
  color: #ef4444;
}

.history-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}

.history-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.history-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-border);
}

.history-thumb {
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  display: block;
}

.history-meta {
  padding: 0.65rem;
}

.history-meta p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  background: var(--bg-card);
}

/* ==========================================================================
   Modal Dialog
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  padding: 1rem;
}

.modal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 520px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
}

.close-btn {
  background: none;
  border: none;
  font-size: 1.2rem;
  color: var(--text-muted);
  cursor: pointer;
}

.modal-body {
  padding: 1.5rem;
}

.modal-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--text-primary);
}

.settings-textarea,
.settings-select {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  outline: none;
}

.settings-textarea:focus,
.settings-select:focus {
  border-color: var(--accent-border);
}

.form-help {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  margin-top: 1.5rem;
}

.btn-save {
  padding: 0.65rem 1.5rem;
  background: var(--accent-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
}

.btn-save:hover {
  opacity: 0.9;
}

/* ==========================================================================
   Toast Notifications
   ========================================================================== */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--text-primary);
  color: var(--bg-primary);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 100;
  transition: all 0.25s ease;
}

/* ==========================================================================
   Responsive Adjustments
   ========================================================================== */
@media (max-width: 640px) {
  .navbar {
    padding: 0 1rem;
  }

  .main-wrapper {
    padding: 1.5rem 1rem 3rem;
  }

  .hero-title {
    font-size: 2rem;
  }

  .toolbar-container {
    flex-direction: column;
    align-items: stretch;
  }

  .toolbar-left {
    justify-content: space-between;
  }

  .btn-generate {
    width: 100%;
  }

  .output-container {
    min-height: 280px;
  }
}