/**
 * Open HEIC File Online
 * https://open-heic-file.github.io
 */

/* === Theme Variables (Default: Light Theme) === */
:root {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --border-color: #e2e8f0;
  --border-hover: #4f46e5;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --primary-color: #4f46e5;
  --primary-hover: #4338ca;
  --accent-color: #059669;
  --accent-hover: #047857;
  --stage-bg: #f1f5f9;
  --stage-grid: #cbd5e1;
  --toolbar-bg: rgba(255, 255, 255, 0.85);
  --shadow-main: 0 10px 25px -5px rgba(0, 0, 0, 0.06), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --icon-btn-bg: #f1f5f9;
  --icon-btn-border: #e2e8f0;
  --icon-btn-hover: #cbd5e1;
  --badge-bg: rgba(79, 70, 229, 0.1);
  --badge-text: #4f46e5;
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 6px;
  --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* === Dark Theme Variables === */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --border-color: #334155;
  --border-hover: #6366f1;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --primary-color: #6366f1;
  --primary-hover: #4f46e5;
  --accent-color: #10b981;
  --accent-hover: #059669;
  --stage-bg: #0b0f19;
  --stage-grid: #1e293b;
  --toolbar-bg: rgba(15, 23, 42, 0.75);
  --shadow-main: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
  --icon-btn-bg: rgba(255, 255, 255, 0.05);
  --icon-btn-border: rgba(255, 255, 255, 0.1);
  --icon-btn-hover: rgba(255, 255, 255, 0.15);
  --badge-bg: rgba(99, 102, 241, 0.15);
  --badge-text: #818cf8;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.app-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* === Header Styles === */
.app-header {
  text-align: center;
  margin-bottom: 2.5rem;
  position: relative;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  margin-bottom: 0.5rem;
}

.logo-area {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 2.25rem;
  height: 2.25rem;
  color: var(--primary-color);
}

.logo-area h1 {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.025em;
}

.theme-toggle-btn {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* === Main Content === */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

/* === Upload Drop Zone === */
.drop-zone {
  width: 100%;
  max-width: 640px;
  background: var(--bg-secondary);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3.5rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: var(--transition-fast);
  box-shadow: var(--shadow-main);
}

.drop-zone:hover, .drop-zone.drag-over {
  border-color: var(--border-hover);
  background: var(--bg-tertiary);
  transform: translateY(-2px);
}

.drop-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

.icon-circle {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--badge-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-color);
  transition: var(--transition-fast);
}

.drop-zone:hover .icon-circle {
  transform: scale(1.1);
}

.icon-circle svg {
  width: 32px;
  height: 32px;
}

.text-group .primary-text {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.35rem;
}

.text-group .secondary-text {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: var(--transition-fast);
}

.btn-primary {
  background: var(--primary-color);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--primary-hover);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.btn-secondary {
  background: var(--accent-color);
  color: #ffffff;
}

.btn-secondary:hover {
  background: var(--accent-hover);
  box-shadow: 0 4px 12px rgba(5, 150, 105, 0.3);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
}

.btn-outline:hover {
  background: var(--bg-tertiary);
  color: var(--text-main);
  border-color: var(--text-muted);
}

.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--icon-btn-bg);
  border: 1px solid var(--icon-btn-border);
  color: var(--text-main);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-fast);
}

.icon-btn:hover {
  background: var(--icon-btn-hover);
  transform: translateY(-1px);
}

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

/* === Loading State === */
.loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 3rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-main);
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border-color);
  border-left-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

#loading-text {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-main);
}

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

/* === Viewer & Toolbar === */
.viewer-section {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.thumbnail-bar {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding: 0.5rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.thumb-item {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 2px solid transparent;
  cursor: pointer;
  opacity: 0.6;
  transition: var(--transition-fast);
  flex-shrink: 0;
}

.thumb-item.active, .thumb-item:hover {
  opacity: 1;
  border-color: var(--primary-color);
}

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

.viewer-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-main);
  display: flex;
  flex-direction: column;
}

.toolbar {
  padding: 1rem 1.5rem;
  background: var(--toolbar-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.file-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.file-name {
  font-weight: 600;
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.badge {
  background: var(--badge-bg);
  color: var(--badge-text);
  padding: 0.2rem 0.6rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  border: 1px solid var(--border-color);
}

.file-info {
  font-size: 0.85rem;
  color: var(--text-muted);
}

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

.zoom-level {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-width: 45px;
  text-align: center;
}

/* Image Stage */
.image-stage {
  position: relative;
  min-height: 500px;
  max-height: 75vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background-color: var(--stage-bg);
  background-image: radial-gradient(var(--stage-grid) 1px, transparent 1px);
  background-size: 20px 20px;
  padding: 2rem;
  cursor: grab;
}

.image-stage:active {
  cursor: grabbing;
}

.preview-img {
  max-width: 100%;
  max-height: 65vh;
  object-fit: contain;
  border-radius: 4px;
  transition: transform 0.15s ease-out;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  user-select: none;
}

/* === Features Grid === */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  width: 100%;
  max-width: 900px;
  margin-top: 3.5rem;
}

.feature-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-main);
  transition: var(--transition-fast);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
}

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

.feature-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--badge-bg);
  color: var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-icon svg {
  width: 22px;
  height: 22px;
}

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.45;
}

/* === Footer === */
.app-footer {
  margin-top: auto;
  padding-top: 3rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

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

@media (max-width: 768px) {
  .toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .action-buttons {
    flex-wrap: wrap;
    justify-content: center;
  }

  .file-meta {
    justify-content: center;
  }

  .theme-toggle-btn {
    position: static;
    transform: none;
    margin-top: 0.5rem;
  }

  .header-top {
    flex-direction: column;
    gap: 0.5rem;
  }
}