/* ===================================================================
   GeminiClear — Modern Minimal Design System
   Tailored HSL palette, Glassmorphism, Micro-animations, Mobile-First
   =================================================================== */

:root {
  --bg-primary: #080c14;
  --bg-surface: #0f1624;
  --bg-surface-elevated: #162034;
  --bg-card: rgba(18, 26, 42, 0.75);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.16);
  --border-focus: rgba(16, 185, 129, 0.4);

  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-indigo: #6366f1;
  --accent-emerald-glow: rgba(16, 185, 129, 0.25);
  
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-glow: 0 0 40px -10px rgba(16, 185, 129, 0.2);
  --shadow-card: 0 20px 40px -15px rgba(0, 0, 0, 0.6);
  --transition-smooth: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

/* Background Ambient Glows & Grid */
.ambient-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.45;
}

.glow-top {
  top: -150px;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 450px;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.35) 0%, rgba(6, 182, 212, 0.2) 50%, transparent 70%);
}

.glow-bottom {
  bottom: -200px;
  right: 10%;
  width: 600px;
  height: 400px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.25) 0%, transparent 70%);
}

.bg-grid-overlay {
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* Visually Hidden Utility */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(8, 12, 20, 0.75);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
}

.header-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
  transition: var(--transition-smooth);
}

.brand-logo:hover {
  transform: translateY(-1px);
}

.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent-emerald), var(--accent-cyan));
  display: grid;
  place-items: center;
  color: #000;
  box-shadow: 0 0 20px -3px var(--accent-emerald);
}

.logo-icon svg {
  width: 20px;
  height: 20px;
}

.brand-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.brand-tag {
  font-size: 0.65rem;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition-smooth);
}

.nav-link:hover {
  color: var(--text-main);
}

.privacy-pill {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.85rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

.privacy-dot {
  width: 7px;
  height: 7px;
  background-color: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-emerald);
  animation: pulse-dot 2s infinite ease-in-out;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

/* Main Layout */
.main-content {
  position: relative;
  z-index: 10;
  max-width: 1040px;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}

/* Hero Section */
.hero-section {
  text-align: center;
  margin-bottom: 2.5rem;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.25);
  color: var(--accent-cyan);
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.hero-headline {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}

.gradient-text {
  background: linear-gradient(135deg, #38bdf8 0%, #34d399 50%, #a78bfa 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subhead {
  max-width: 600px;
  margin: 0 auto;
  color: var(--text-muted);
  font-size: 1.05rem;
  font-weight: 400;
}

/* Workspace Card */
.workspace-card {
  position: relative;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: var(--transition-smooth);
}

/* Dropzone (Initial State) */
.dropzone-container {
  padding: 4.5rem 2rem;
  text-align: center;
  border: 2px dashed rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  margin: 0.75rem;
  background: rgba(15, 22, 36, 0.5);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.dropzone-container:hover,
.dropzone-container.drag-over {
  border-color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.04);
  box-shadow: inset 0 0 30px rgba(16, 185, 129, 0.08);
}

.drop-icon-wrapper {
  width: 68px;
  height: 68px;
  margin: 0 auto 1.5rem;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  display: grid;
  place-items: center;
  color: var(--accent-emerald);
  transition: var(--transition-smooth);
}

.dropzone-container:hover .drop-icon-wrapper {
  transform: translateY(-4px);
  color: #fff;
  background: var(--accent-emerald);
  box-shadow: 0 10px 25px -5px var(--accent-emerald);
}

.drop-icon {
  width: 32px;
  height: 32px;
}

.drop-title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.drop-hint {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.browse-trigger {
  background: none;
  border: none;
  color: var(--accent-emerald);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
  padding: 0;
  font-size: inherit;
}

.drop-shortcuts {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 1.75rem;
}

kbd {
  font-family: var(--font-mono);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--border-subtle);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  color: var(--text-muted);
  font-size: 0.75rem;
}

.security-guarantee {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.03);
  padding: 0.45rem 1rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.lock-icon {
  width: 14px;
  height: 14px;
  color: var(--accent-emerald);
}

/* Processing Overlay */
.processing-overlay {
  position: absolute;
  inset: 0;
  background: rgba(8, 12, 20, 0.88);
  backdrop-filter: blur(10px);
  z-index: 30;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.spinner-ring {
  width: 48px;
  height: 48px;
  border: 3px solid rgba(255, 255, 255, 0.1);
  border-top-color: var(--accent-emerald);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.processing-text {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
}

.processing-subtext {
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* Studio Container */
.studio-container {
  display: flex;
  flex-direction: column;
}

.studio-toolbar {
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(15, 22, 36, 0.4);
  flex-wrap: wrap;
  gap: 0.75rem;
}

.file-meta-group {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.file-name {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-main);
  max-width: 220px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.meta-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
}

.status-badge {
  background: rgba(16, 185, 129, 0.12);
  border-color: rgba(16, 185, 129, 0.3);
  color: var(--accent-emerald);
  font-weight: 600;
}

.toolbar-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.view-controls {
  display: flex;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 2px;
}

.tool-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: var(--transition-smooth);
}

.tool-btn:hover {
  color: var(--text-main);
}

.tool-btn.active {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

.secondary-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
}

.secondary-btn:hover {
  background: rgba(255, 255, 255, 0.12);
}

.btn-svg {
  width: 14px;
  height: 14px;
}

/* View Mode Toggle */
.view-mode-toggle {
  display: flex;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 2px;
}

.mode-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: var(--transition-smooth);
}

.mode-btn:hover {
  color: var(--text-main);
}

.mode-btn.active {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.25), rgba(6, 182, 212, 0.2));
  border: 1px solid rgba(16, 185, 129, 0.4);
  color: #fff;
  box-shadow: 0 0 15px -3px rgba(16, 185, 129, 0.3);
}

/* Side-by-Side Dual Viewer */
.side-by-side-wrapper {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0.85rem;
  padding: 1rem;
  background: #05080f;
  min-height: 480px;
  align-items: stretch;
}

.side-panel {
  background: rgba(15, 22, 36, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  transition: var(--transition-smooth);
}

.side-panel:hover {
  border-color: var(--border-hover);
}

.panel-header {
  padding: 0.65rem 1rem;
  background: rgba(8, 12, 20, 0.75);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.panel-tag {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
}

.tag-original {
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #f87171;
}

.tag-cleaned {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.35);
  color: #34d399;
}

.panel-corner-hint {
  font-size: 0.75rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

.success-hint {
  color: var(--accent-emerald);
  font-weight: 600;
}

.panel-viewport {
  position: relative;
  flex-grow: 1;
  height: 440px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: #020408;
}

.panel-viewport img,
.panel-viewport canvas {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  display: block;
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Side Divider */
.side-divider-line {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.side-divider-line::before {
  content: '';
  position: absolute;
  top: 10%;
  bottom: 10%;
  width: 1px;
  background: linear-gradient(to bottom, transparent, var(--border-subtle), transparent);
}

.divider-badge {
  position: relative;
  z-index: 2;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 0.75rem;
  color: var(--text-dim);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: grid;
  place-items: center;
}

/* Viewer Wrapper & Comparison Container */
.viewer-wrapper {
  position: relative;
  width: 100%;
  height: 520px;
  background: #05080f;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  user-select: none;
}

.comparison-container {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-layer {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.image-layer img,
.image-layer canvas {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  display: block;
}

/* After layer is clipped by slider position */
.after-layer {
  z-index: 5;
  clip-path: inset(0 0 0 50%);
}

.layer-tag {
  position: absolute;
  top: 1rem;
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  backdrop-filter: blur(8px);
  pointer-events: none;
  z-index: 10;
}

.before-tag {
  left: 1rem;
  background: rgba(0, 0, 0, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-muted);
}

.after-tag {
  right: 1rem;
  background: rgba(16, 185, 129, 0.25);
  border: 1px solid rgba(16, 185, 129, 0.4);
  color: #34d399;
}

/* Split Handle */
.split-handle {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 40px;
  transform: translateX(-50%);
  z-index: 20;
  cursor: ew-resize;
  display: flex;
  align-items: center;
  justify-content: center;
  touch-action: none;
}

.handle-line {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2px;
  background: #fff;
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.6);
}

.handle-button {
  position: relative;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5), 0 0 20px rgba(255, 255, 255, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #000;
  transition: transform 0.15s ease;
}

.split-handle:hover .handle-button,
.split-handle.dragging .handle-button {
  transform: scale(1.15);
}

.handle-button svg {
  width: 14px;
  height: 14px;
}

/* Bottom Action Bar */
.action-footer {
  padding: 1.25rem;
  border-top: 1px solid var(--border-subtle);
  background: rgba(15, 22, 36, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
}

.download-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  max-width: 580px;
  justify-content: center;
}

.format-select-wrapper {
  flex-shrink: 0;
}

.format-select {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 0.7rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-family: inherit;
  font-weight: 500;
  cursor: pointer;
  outline: none;
  transition: var(--transition-smooth);
}

.format-select:focus {
  border-color: var(--accent-emerald);
}

.primary-btn {
  flex-grow: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--accent-emerald), #059669);
  color: #fff;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
  box-shadow: 0 4px 18px -2px rgba(16, 185, 129, 0.4);
}

.primary-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px -2px rgba(16, 185, 129, 0.55);
}

.icon-action-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 0.7rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition-smooth);
}

.icon-action-btn:hover {
  background: rgba(255, 255, 255, 0.12);
}

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

/* Batch Strip */
.batch-strip {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border-subtle);
  background: rgba(8, 12, 20, 0.5);
}

.batch-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.batch-count {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.download-all-btn {
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.35);
  color: #a5b4fc;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: var(--transition-smooth);
}

.download-all-btn:hover {
  background: rgba(99, 102, 241, 0.3);
  color: #fff;
}

.batch-thumbnails {
  display: flex;
  gap: 0.6rem;
  overflow-x: auto;
  padding-bottom: 0.4rem;
}

.batch-thumb-item {
  position: relative;
  width: 60px;
  height: 75px;
  border-radius: 8px;
  overflow: hidden;
  border: 2px solid transparent;
  cursor: pointer;
  flex-shrink: 0;
  background: #000;
  transition: var(--transition-smooth);
}

.batch-thumb-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.batch-thumb-item:hover,
.batch-thumb-item.active {
  border-color: var(--accent-emerald);
  transform: translateY(-2px);
}

.batch-check-icon {
  position: absolute;
  top: 3px;
  right: 3px;
  width: 14px;
  height: 14px;
  background: var(--accent-emerald);
  color: #000;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 9px;
  font-weight: 800;
}

/* Features Grid */
.info-section {
  margin-top: 5rem;
  text-align: center;
}

.section-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-emerald);
  margin-bottom: 0.5rem;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.section-subhead {
  color: var(--text-muted);
  max-width: 520px;
  margin: 0 auto 2.5rem;
  font-size: 0.95rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  text-align: left;
}

.feature-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 2rem 1.75rem;
  transition: var(--transition-smooth);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: 0 15px 35px -10px rgba(0, 0, 0, 0.4);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  margin-bottom: 1.25rem;
}

.card-icon svg {
  width: 24px;
  height: 24px;
}

.card-icon.cyan { background: rgba(6, 182, 212, 0.12); color: var(--accent-cyan); }
.card-icon.emerald { background: rgba(16, 185, 129, 0.12); color: var(--accent-emerald); }
.card-icon.indigo { background: rgba(99, 102, 241, 0.12); color: var(--accent-indigo); }

.feature-card h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.55;
}

.feature-card code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: rgba(255, 255, 255, 0.06);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  color: #38bdf8;
}

/* Steps Grid (How-To) */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  text-align: left;
}

.step-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 2rem 1.75rem;
  transition: var(--transition-smooth);
  position: relative;
}

.step-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: 0 15px 35px -10px rgba(0, 0, 0, 0.4);
}

.step-number {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(6, 182, 212, 0.2));
  border: 1px solid rgba(16, 185, 129, 0.4);
  color: #34d399;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  display: grid;
  place-items: center;
  margin-bottom: 1.25rem;
  box-shadow: 0 4px 15px -3px rgba(16, 185, 129, 0.25);
}

.step-card h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.step-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.55;
}

/* FAQ Accordion */
.faq-section {
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  text-align: left;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition-smooth);
}

.faq-item:hover {
  border-color: var(--border-hover);
}

.faq-question {
  padding: 1.25rem 1.5rem;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-icon {
  font-size: 1.3rem;
  color: var(--accent-emerald);
  transition: transform 0.25s ease;
}

.faq-item[open] .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 1.5rem 1.25rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Footer */
.site-footer {
  margin-top: 5rem;
  border-top: 1px solid var(--border-subtle);
  padding: 2.5rem 1.5rem;
  position: relative;
  z-index: 10;
  background: rgba(8, 12, 20, 0.8);
}

.footer-container {
  max-width: 1040px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition-smooth);
}

.footer-links a:hover {
  color: var(--accent-emerald);
}

/* Hidden Utility */
.hidden {
  display: none !important;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  .site-header .header-nav a {
    display: none;
  }

  .main-content {
    padding: 1.75rem 1rem 3.5rem;
  }

  .dropzone-container {
    padding: 3rem 1.25rem;
  }

  .side-by-side-wrapper {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding: 0.75rem;
  }

  .side-divider-line {
    display: none;
  }

  .panel-viewport {
    height: 320px;
  }

  .viewer-wrapper {
    height: 380px;
  }

  .download-group {
    flex-direction: column;
    width: 100%;
  }

  .format-select-wrapper,
  .format-select,
  .primary-btn {
    width: 100%;
  }

  .studio-toolbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .toolbar-actions {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0.6rem;
  }

  .view-mode-toggle {
    width: 100%;
  }

  .mode-btn {
    flex: 1;
    justify-content: center;
  }

  .view-controls {
    width: 100%;
    justify-content: space-between;
  }

  .footer-container {
    flex-direction: column;
    text-align: center;
    align-items: center;
  }
}