/* 
 * RevStack Shorts Production System
 * Premium Stylesheet
 */

:root {
  /* Fallback Brand Colors - Overridden by JS */
  --rs-ink: #0f1115;
  --rs-indigo: #4f46e5;
  --rs-indigo-light: #6366f1;
  --rs-gold: #f59e0b;
  --rs-bone: #f9fafb;
  --rs-slate: #9ca3af;
  --rs-font-stack: 'Inter', system-ui, -apple-system, sans-serif;
  
  /* Fluid Spacing */
  --space-xs: clamp(0.25rem, 0.5vw, 0.5rem);
  --space-sm: clamp(0.5rem, 1vw, 0.75rem);
  --space-md: clamp(0.75rem, 1.5vw, 1.25rem);
  --space-lg: clamp(1rem, 2vw, 2rem);
  --space-xl: clamp(1.5rem, 3vw, 3rem);

  /* Fluid Typography */
  --text-xs: clamp(0.625rem, calc(0.54rem + 0.521vw), 0.875rem);
  --text-sm: clamp(0.75rem, calc(0.65rem + 0.6vw), 1rem);
  --text-base: clamp(0.875rem, calc(0.689rem + 1.146vw), 1.125rem);
  --text-h3: clamp(0.9rem, calc(0.8rem + 0.5vw), 1.25rem);
  --text-h1: clamp(1.5rem, calc(1.026rem + 2.917vw), 3rem);

  /* Other Configs */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   RESET & BASE
   ========================================================================== */

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

body {
  font-family: var(--rs-font-stack);
  background-color: var(--rs-ink);
  color: var(--rs-bone);
  line-height: 1.5;
  font-size: var(--text-base);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--rs-ink);
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  border: 2px solid var(--rs-ink);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--rs-indigo);
}

/* ==========================================================================
   LAYOUT
   ========================================================================== */

.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
  padding: var(--space-md);
  animation: fadeIn 0.4s ease-out;
}

.studio-layout, .thumbnail-layout {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr; /* Default mobile stack */
}

@media (min-width: 700px) {
  .studio-layout, .thumbnail-layout {
    grid-template-columns: 1fr minmax(300px, 480px);
    align-items: start;
  }
}

@media (min-width: 1280px) {
  .app-main {
    padding: var(--space-xl);
  }
}

.preview-column {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  position: sticky;
  top: var(--space-md);
}

.controls-column {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

@media (min-width: 700px) {
  .controls-column {
    max-height: 85vh;
    overflow-y: auto;
    padding-right: var(--space-xs);
  }
}

/* ==========================================================================
   COMPONENTS
   ========================================================================== */

/* Header */
.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  background: rgba(15, 17, 21, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  box-shadow: 0 4px 30px rgba(79, 70, 229, 0.05);
}

.header-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.header-logo-img {
  height: 40px;
  width: auto;
  border-radius: var(--radius-sm);
  display: none; /* hidden if empty */
}

.header-logo-img[src]:not([src=""]) {
  display: block;
}

.header-title {
  font-size: var(--text-h3);
  font-weight: 800;
  color: var(--rs-bone);
  letter-spacing: -0.02em;
}

.header-tagline {
  font-size: var(--text-xs);
  color: var(--rs-slate);
}

.channel-select {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--rs-bone);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--text-sm);
  cursor: pointer;
  outline: none;
}

/* Tab Nav */
.tab-nav {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  background: rgba(255, 255, 255, 0.03);
  padding: var(--space-xs);
  border-radius: 100px;
  width: fit-content;
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--rs-slate);
  padding: var(--space-xs) var(--space-lg);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: 100px;
  cursor: pointer;
  transition: var(--transition);
  min-height: 44px; /* Touch target */
}

.tab-btn:hover {
  color: var(--rs-bone);
}

.tab-btn.active {
  background: var(--rs-indigo);
  color: var(--rs-bone);
  box-shadow: 0 2px 10px rgba(79, 70, 229, 0.3);
}

.tab-content {
  display: none;
  animation: fadeIn 0.3s ease-out;
}

.tab-content.active {
  display: block;
}

/* Panels */
.control-panel {
  background: rgba(255, 255, 255, 0.02);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.2);
}

.panel-title {
  font-size: var(--text-h3);
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--rs-bone);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

/* Canvas */
.canvas-container {
  aspect-ratio: 9 / 16;
  max-width: 100%;
  width: 100%;
  background: #000;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(0,0,0,0.5);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.canvas-container canvas {
  width: 100%;
  height: auto;
  display: block;
}

/* Preview Controls */
.preview-controls {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background: rgba(255, 255, 255, 0.03);
  padding: var(--space-sm);
  border-radius: var(--radius-md);
}

.time-display {
  font-size: var(--text-xs);
  color: var(--rs-slate);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.seek-bar {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  cursor: pointer;
  height: 20px;
}

.seek-bar::-webkit-slider-runnable-track {
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
}

.seek-bar::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  height: 16px;
  width: 16px;
  border-radius: 50%;
  background: var(--rs-indigo);
  margin-top: -5px;
  box-shadow: 0 0 10px rgba(79, 70, 229, 0.5);
}

/* Template Picker */
.template-picker {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.template-btn {
  flex: 1;
  min-width: 100px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  padding: var(--space-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  transition: var(--transition);
  color: var(--rs-slate);
  text-align: center;
}

.template-btn:hover {
  background: rgba(255, 255, 255, 0.06);
  transform: translateY(-2px);
}

.template-btn.active {
  border-color: var(--rs-indigo);
  background: rgba(79, 70, 229, 0.1);
  color: var(--rs-bone);
  box-shadow: 0 0 15px rgba(79, 70, 229, 0.2);
}

.template-icon {
  font-size: 1.5rem;
}

.template-name {
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--rs-bone);
}

.template-desc {
  font-size: var(--text-xs);
  opacity: 0.8;
}

/* Upload Zone */
.upload-zone {
  display: block;
  position: relative;
  border: 2px dashed rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-align: center;
  transition: var(--transition);
  background: rgba(255, 255, 255, 0.01);
  overflow: hidden;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
}

.upload-zone:hover {
  border-color: var(--rs-indigo);
  background: rgba(79, 70, 229, 0.05);
}

.upload-zone-content {
  pointer-events: none;
}

.upload-zone-sm {
  padding: var(--space-md);
}

.upload-input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
  z-index: 5;
}

.upload-icon {
  font-size: 2rem;
  margin-bottom: var(--space-xs);
  display: block;
}

.upload-text {
  font-weight: 500;
  color: var(--rs-bone);
  margin-bottom: 4px;
}

.upload-hint {
  font-size: var(--text-xs);
  color: var(--rs-slate);
}

.upload-zone.drag-over {
  border-color: var(--rs-gold);
  background: rgba(245, 158, 11, 0.08);
  border-style: solid;
}

.video-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.05);
  padding: var(--space-sm);
  border-radius: var(--radius-sm);
  margin-top: var(--space-sm);
  font-size: var(--text-sm);
}

.video-filename {
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 150px;
}

.video-duration {
  color: var(--rs-slate);
  font-size: var(--text-xs);
}

/* Forms */
.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  color: var(--rs-bone);
  font-size: var(--text-sm);
}

.form-hint {
  display: block;
  font-weight: 400;
  font-size: var(--text-xs);
  color: var(--rs-slate);
  margin-top: 4px;
}

.form-hint code {
  background: rgba(242, 169, 59, 0.15);
  color: var(--rs-gold);
  padding: 1px 6px;
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.9em;
}

.title-input-group {
  display: flex;
  gap: var(--space-xs);
  align-items: center;
}

.title-input-group .form-input {
  flex: 1;
}

.form-input, .form-textarea {
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--rs-bone);
  padding: var(--space-sm);
  border-radius: var(--radius-sm);
  font-family: var(--rs-font-stack);
  font-size: var(--text-base);
  transition: var(--transition);
}

.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--rs-indigo);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

.form-input::placeholder, .form-textarea::placeholder {
  color: var(--rs-slate);
  opacity: 0.6;
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
}

.form-input-sm {
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--text-sm);
}

/* Advanced Section */
.advanced-section {
  margin-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-sm);
}

.advanced-toggle {
  cursor: pointer;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--rs-slate);
  user-select: none;
  transition: var(--transition);
}

.advanced-toggle:hover {
  color: var(--rs-bone);
}

.advanced-section[open] .advanced-toggle {
  margin-bottom: var(--space-sm);
  color: var(--rs-bone);
}

/* Toggles */
.toggle-group {
  margin-bottom: var(--space-sm);
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
  font-size: var(--text-sm);
  user-select: none;
}

.toggle-input {
  display: none;
}

.toggle-switch {
  position: relative;
  width: 44px;
  height: 24px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  transition: var(--transition);
}

.toggle-switch::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  background: #fff;
  border-radius: 50%;
  transition: var(--transition);
}

.toggle-input:checked + .toggle-switch {
  background: var(--rs-indigo);
}

.toggle-input:checked + .toggle-switch::after {
  transform: translateX(20px);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  border-radius: var(--radius-sm);
  text-decoration: none;
  min-height: 44px; /* Touch target */
  padding: 0 var(--space-md);
  font-size: var(--text-base);
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--rs-indigo), var(--rs-indigo-light));
  color: #fff;
}
.btn-primary:hover:not(:disabled) {
  filter: brightness(1.1);
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(79, 70, 229, 0.4);
}

.btn-secondary {
  background: transparent;
  color: var(--rs-bone);
  border: 1px solid rgba(255, 255, 255, 0.2);
}
.btn-secondary:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.3);
}

.btn-gold {
  background: linear-gradient(135deg, var(--rs-gold), #fbbf24);
  color: #000;
}
.btn-gold:hover:not(:disabled) {
  filter: brightness(1.1);
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.4);
}

.btn-ghost {
  background: transparent;
  color: var(--rs-slate);
}
.btn-ghost:hover:not(:disabled) {
  color: var(--rs-bone);
  background: rgba(255, 255, 255, 0.05);
}

.btn-lg {
  width: 100%;
  padding: var(--space-md);
  font-size: 1.125rem;
}

.btn-sm {
  min-height: 32px;
  padding: 0 var(--space-sm);
  font-size: var(--text-xs);
}

/* Presets */
.preset-row {
  display: flex;
  gap: var(--space-xs);
  margin-bottom: var(--space-sm);
}

.preset-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.preset-list p {
  font-size: var(--text-xs);
  color: var(--rs-slate);
  padding: var(--space-xs);
}

.preset-item {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
}

.preset-load-btn {
  flex: 1;
  text-align: left;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  color: var(--rs-bone);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: inherit;
  font-size: var(--text-sm);
  transition: var(--transition);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.preset-load-btn:hover {
  background: rgba(79, 70, 229, 0.1);
  border-color: var(--rs-indigo);
}

.preset-delete-btn {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
  color: #ef4444;
  padding: var(--space-xs) 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: var(--text-xs);
  line-height: 1;
  transition: var(--transition);
  min-height: 32px;
}

.preset-delete-btn:hover {
  background: rgba(239, 68, 68, 0.25);
  border-color: #ef4444;
}

/* Export Progress */
.export-panel {
  border-color: rgba(79, 70, 229, 0.3);
  background: rgba(79, 70, 229, 0.03);
}

.export-progress {
  margin-top: var(--space-md);
  text-align: center;
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: var(--space-xs);
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--rs-indigo), var(--rs-indigo-light));
  transition: width 0.3s ease;
  position: relative;
}

.progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  animation: shimmer 1.5s infinite;
}

.progress-text {
  font-size: var(--text-xs);
  color: var(--rs-slate);
}

.export-result {
  margin-top: var(--space-md);
  text-align: center;
}

.export-note {
  font-size: var(--text-xs);
  color: var(--rs-slate);
  margin-top: var(--space-sm);
  line-height: 1.4;
}

/* Footer */
.app-footer {
  text-align: center;
  padding: var(--space-lg) 0;
  color: var(--rs-slate);
  font-size: var(--text-xs);
}

.footer-heart {
  color: #ef4444;
}

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

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* Extra small devices (max 320px) */
@media (max-width: 320px) {
  .app-main {
    padding: var(--space-sm);
  }
  .app-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
  .header-actions {
    width: 100%;
  }
  .channel-select {
    width: 100%;
  }
}