/* ========================================
   Image Tools - New UI/UX Design
   ======================================== */

/* CSS Variables */
:root {
  --bg: #f8fafc;
  --bg-secondary: #f1f5f9;
  --surface: #ffffff;
  --surface-hover: #f8fafc;
  --text: #0f172a;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --border-hover: #cbd5e1;
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: #eef2ff;
  --success: #10b981;
  --success-light: #d1fae5;
  --danger: #ef4444;
  --danger-light: #fee2e2;
  --warning: #f59e0b;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --transition: 0.2s ease;
}

/* Dark Mode */
[data-theme="dark"] {
  --bg: #0f172a;
  --bg-secondary: #1e293b;
  --surface: #1e293b;
  --surface-hover: #334155;
  --text: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: #334155;
  --border-hover: #475569;
  --primary: #818cf8;
  --primary-hover: #6366f1;
  --primary-light: rgba(99, 102, 241, 0.15);
  --success: #34d399;
  --success-light: rgba(16, 185, 129, 0.15);
  --danger: #f87171;
  --danger-light: rgba(239, 68, 68, 0.15);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans JP', sans-serif;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
}

/* App Container */
.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-icon {
  width: 28px;
  height: 28px;
  color: var(--primary);
}

.header h1 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

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

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

/* Theme Toggle Icons */
.icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }

/* Main Content */
.main {
  flex: 1;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* Section */
.section {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-header h2 {
  font-size: 16px;
  font-weight: 600;
}

.step-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  font-size: 13px;
  font-weight: 700;
}

/* Dropzone */
.dropzone {
  position: relative;
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  outline: none;
}

.dropzone:hover,
.dropzone:focus-visible {
  border-color: var(--primary);
  background: var(--primary-light);
}

.dropzone.dragover {
  border-color: var(--primary);
  background: var(--primary-light);
  transform: scale(1.01);
}

.dropzone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.dropzone-icon {
  width: 48px;
  height: 48px;
  color: var(--text-muted);
  transition: var(--transition);
}

.dropzone:hover .dropzone-icon,
.dropzone.dragover .dropzone-icon {
  color: var(--primary);
}

.dropzone-text {
  font-size: 15px;
  color: var(--text-secondary);
}

.dropzone-or {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.btn:hover:not(:disabled) {
  background: var(--surface-hover);
  border-color: var(--border-hover);
}

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

.btn-primary {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
}

.btn-outline {
  background: transparent;
  border-color: var(--primary);
  color: var(--primary);
}

.btn-outline:hover:not(:disabled) {
  background: var(--primary-light);
}

.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--bg-secondary);
  color: var(--text);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 13px;
}

.btn-icon {
  width: 18px;
  height: 18px;
}

.btn-convert {
  width: 100%;
  padding: 16px 24px;
  font-size: 16px;
  border-radius: var(--radius);
}

/* Selected Files */
.selected-files {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.selected-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.selected-count {
  font-weight: 600;
  color: var(--primary);
}

.selected-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 8px;
  padding: 12px;
  max-height: 200px;
  overflow-y: auto;
}

.selected-item {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-secondary);
}

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

.selected-item-remove {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 24px;
  height: 24px;
  border: none;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.6);
  color: white;
  font-size: 14px;
  cursor: pointer;
  opacity: 0;
  transition: var(--transition);
}

.selected-item:hover .selected-item-remove {
  opacity: 1;
}

.selected-item-name {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 4px 6px;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
  color: white;
  font-size: 10px;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
}

/* Presets Grid */
.presets-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
}

.preset-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 20px 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.preset-card:hover {
  border-color: var(--border-hover);
  background: var(--surface-hover);
}

.preset-card.active {
  border-color: var(--primary);
  background: var(--primary-light);
}

.preset-card-icon {
  width: 32px;
  height: 32px;
  color: var(--text-muted);
  transition: var(--transition);
}

.preset-card.active .preset-card-icon {
  color: var(--primary);
}

.preset-card-name {
  font-weight: 600;
  font-size: 14px;
}

.preset-card-desc {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.4;
}

/* Custom Settings */
.custom-settings {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-top: 8px;
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.setting-group label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

.setting-group input[type="number"],
.setting-group select {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  transition: var(--transition);
}

.setting-group input[type="number"]:focus,
.setting-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.setting-group input[type="range"] {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--border);
  appearance: none;
  cursor: pointer;
}

.setting-group input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  transition: var(--transition);
}

.setting-group input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

.quality-value {
  font-weight: 600;
  color: var(--primary);
}

.quality-hint {
  font-size: 11px;
  color: var(--text-muted);
}

.setting-checkbox label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}

.setting-checkbox input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  cursor: pointer;
}

/* Preset Management */
.preset-management {
  margin-top: 8px;
}

.preset-management summary {
  padding: 12px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 13px;
  color: var(--text-secondary);
  transition: var(--transition);
}

.preset-management summary:hover {
  background: var(--surface-hover);
}

.preset-management[open] summary {
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  border-bottom: none;
}

.preset-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

/* Progress */
.progress-section {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 16px;
}

.progress-bar {
  flex: 1;
  height: 8px;
  background: var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--primary);
  border-radius: 4px;
  transition: width 0.3s ease;
  width: 0%;
}

.progress-text {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  min-width: 60px;
  text-align: right;
}

/* Results Section */
.results-section {
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.results-title {
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-icon {
  width: 24px;
  height: 24px;
  color: var(--success);
}

.results-actions {
  display: flex;
  gap: 8px;
  margin-left: auto;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}

/* Result Card */
.result-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}

.result-card:hover {
  box-shadow: var(--shadow);
}

.result-thumb {
  position: relative;
  aspect-ratio: 4/3;
  background: repeating-conic-gradient(
    var(--bg-secondary) 0% 25%,
    var(--surface) 25% 50%
  ) 0 0 / 16px 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.result-thumb img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.result-badge {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 700;
}

.result-badge.success {
  background: var(--success-light);
  color: var(--success);
}

.result-badge.error {
  background: var(--danger-light);
  color: var(--danger);
}

.result-reduction {
  position: absolute;
  bottom: 8px;
  left: 8px;
  padding: 4px 8px;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.7);
  color: white;
  font-size: 12px;
  font-weight: 600;
}

.result-body {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.result-name {
  font-weight: 600;
  font-size: 13px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.result-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12px;
  color: var(--text-muted);
}

.result-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.result-error {
  padding: 8px;
  background: var(--danger-light);
  color: var(--danger);
  font-size: 12px;
  border-radius: var(--radius-sm);
}

.result-footer {
  padding: 12px;
  padding-top: 0;
}

.result-footer .btn {
  width: 100%;
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 1000;
}

.toast {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  animation: slideIn 0.3s ease;
}

.toast.success {
  border-color: var(--success);
}

.toast.error {
  border-color: var(--danger);
}

.toast-icon {
  width: 20px;
  height: 20px;
}

.toast.success .toast-icon {
  color: var(--success);
}

.toast.error .toast-icon {
  color: var(--danger);
}

.toast-message {
  font-size: 14px;
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Responsive */
@media (max-width: 640px) {
  .header {
    padding: 12px 16px;
  }

  .main {
    padding: 24px 16px;
    gap: 24px;
  }

  .dropzone {
    padding: 32px 16px;
  }

  .presets-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .settings-grid {
    grid-template-columns: 1fr;
  }

  .results-actions {
    flex-direction: column;
    width: 100%;
  }

  .results-actions .btn {
    width: 100%;
  }

  .results-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .section-header {
    flex-wrap: wrap;
  }

  .toast-container {
    left: 16px;
    right: 16px;
    bottom: 16px;
  }
}

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

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

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

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

/* Focus visible */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

button:focus:not(:focus-visible) {
  outline: none;
}