/* ===== CSS Variables ===== */
:root {
  /* Colors */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #12121a;
  --color-bg-card: #1a1a25;
  --color-bg-hover: #22222f;

  --color-accent-primary: #6366f1;
  --color-accent-secondary: #818cf8;
  --color-accent-glow: rgba(99, 102, 241, 0.3);

  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;

  --color-text-primary: #f8fafc;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;

  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(255, 255, 255, 0.15);

  /* Gradients */
  --gradient-accent: linear-gradient(
    135deg,
    #6366f1 0%,
    #8b5cf6 50%,
    #a855f7 100%
  );
  --gradient-card: linear-gradient(
    145deg,
    rgba(255, 255, 255, 0.05) 0%,
    rgba(255, 255, 255, 0.02) 100%
  );
  --gradient-glow: radial-gradient(
    ellipse at center,
    var(--color-accent-glow) 0%,
    transparent 70%
  );

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px var(--color-accent-glow);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;

  /* Typography */
  --font-sans: "Inter", "Noto Sans TC", -apple-system, BlinkMacSystemFont,
    sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===== App Container ===== */
.app-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== Header ===== */
.header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
  animation: fadeInDown 0.6s ease-out;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.logo-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-accent);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow);
}

.logo-icon svg {
  width: 28px;
  height: 28px;
  color: white;
}

.logo h1 {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tagline {
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
  font-weight: 400;
}

/* ===== Main Content ===== */
.main-content {
  flex: 1;
}

/* ===== Upload Section ===== */
.upload-section {
  margin-bottom: var(--spacing-2xl);
  animation: fadeInUp 0.6s ease-out 0.1s backwards;
}

.upload-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-3xl);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  background: var(--gradient-card);
  position: relative;
  overflow: hidden;
}

.upload-zone::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 300px;
  height: 300px;
  background: var(--gradient-glow);
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity var(--transition-normal);
  pointer-events: none;
}

.upload-zone:hover {
  border-color: var(--color-accent-primary);
  background: var(--color-bg-hover);
}

.upload-zone:hover::before {
  opacity: 1;
}

.upload-zone.drag-over {
  border-color: var(--color-accent-secondary);
  background: rgba(99, 102, 241, 0.1);
  transform: scale(1.01);
}

.upload-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--spacing-lg);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal);
}

.upload-zone:hover .upload-icon {
  background: var(--gradient-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.upload-icon svg {
  width: 40px;
  height: 40px;
  color: var(--color-text-secondary);
  transition: color var(--transition-normal);
}

.upload-zone:hover .upload-icon svg {
  color: white;
}

.upload-zone h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.upload-zone p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.file-types {
  display: inline-block;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  background: var(--color-bg-secondary);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-full);
}

/* ===== Status Section ===== */
.status-section {
  margin-bottom: var(--spacing-2xl);
}

.status-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  border: 1px solid var(--color-border);
}

.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--color-bg-secondary);
  border-top-color: var(--color-accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ===== Results Section ===== */
.results-section {
  margin-bottom: var(--spacing-2xl);
  animation: fadeIn 0.4s ease-out;
}

.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.results-header h2 {
  font-size: var(--font-size-2xl);
  font-weight: 600;
}

.results-actions {
  display: flex;
  gap: var(--spacing-md);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  font-family: inherit;
}

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

.btn-primary {
  background: var(--gradient-accent);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow), var(--shadow-lg);
}

.btn-secondary {
  background: var(--color-bg-card);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

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

/* ===== Results Grid ===== */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.result-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
  animation: fadeInUp 0.4s ease-out backwards;
}

.result-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-lg);
}

.result-image-container {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  cursor: pointer;
}

.result-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.result-card:hover .result-image {
  transform: scale(1.05);
}

.result-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8) 0%, transparent 50%);
  opacity: 0;
  transition: opacity var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
}

.result-card:hover .result-overlay {
  opacity: 1;
}

.result-overlay svg {
  width: 40px;
  height: 40px;
  color: white;
  opacity: 0.9;
}

.result-info {
  padding: var(--spacing-md);
}

.result-filename {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: var(--spacing-xs);
}

.result-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
}

.result-status {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.result-status.success {
  color: var(--color-success);
}

.result-status.error {
  color: var(--color-error);
}

.result-actions {
  display: flex;
  gap: var(--spacing-sm);
  padding: 0 var(--spacing-md) var(--spacing-md);
}

.result-actions .btn {
  flex: 1;
  justify-content: center;
  padding: var(--spacing-sm);
}

/* ===== Info Section ===== */
.info-section {
  margin-bottom: var(--spacing-2xl);
  animation: fadeInUp 0.6s ease-out 0.2s backwards;
}

.info-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.info-card {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  text-align: center;
  transition: all var(--transition-normal);
}

.info-card:hover {
  border-color: var(--color-accent-primary);
  background: var(--color-bg-hover);
}

.info-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--spacing-md);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal);
}

.info-card:hover .info-icon {
  background: var(--gradient-accent);
  box-shadow: var(--shadow-glow);
}

.info-icon svg {
  width: 28px;
  height: 28px;
  color: var(--color-accent-primary);
  transition: color var(--transition-normal);
}

.info-card:hover .info-icon svg {
  color: white;
}

.info-card h4 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.info-card p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: var(--spacing-xl) 0;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.disclaimer {
  margin-top: var(--spacing-sm);
  color: var(--color-warning);
  font-size: var(--font-size-xs);
}

/* ===== Modal ===== */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
}

.modal-content {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 90vw;
  height: 90vh;
  max-width: 1200px;
  background: var(--color-bg-card);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  transform: scale(0.95);
  transition: transform var(--transition-normal);
}

.modal.active .modal-content {
  transform: scale(1);
}

.modal-close {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  width: 40px;
  height: 40px;
  border: none;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  z-index: 10;
}

.modal-close:hover {
  background: var(--color-accent-primary);
}

.modal-close svg {
  width: 20px;
  height: 20px;
  color: var(--color-text-primary);
}

.modal-image-container {
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0; /* Critical for flex scrolling */
  overflow: hidden;
}

.modal-tabs {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  flex-shrink: 0;
}

.modal-viewport {
  flex: 1;
  min-height: 0; /* Critical for flex scrolling */
  width: 100%;
  overflow: auto;
  border-radius: var(--radius-lg);
  background: var(--color-bg-primary);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  border: 1px solid var(--color-border);
  cursor: zoom-in;
}

.modal-viewport.zoomed {
  cursor: zoom-out;
  display: block;
}

.modal-tab {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-family: inherit;
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.modal-tab:hover {
  background: var(--color-bg-hover);
  color: var(--color-text-primary);
}

.modal-tab.active {
  background: var(--gradient-accent);
  color: white;
}

#previewImage {
  display: block;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  transition: transform var(--transition-fast);
}

.modal-viewport.zoomed #previewImage {
  max-width: none;
  max-height: none;
  width: 100%; /* Fit width */
  height: auto;
}

/* ===== Animations ===== */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .app-container {
    padding: var(--spacing-md);
  }

  .logo h1 {
    font-size: var(--font-size-2xl);
  }

  .upload-zone {
    padding: var(--spacing-xl);
  }

  .results-header {
    flex-direction: column;
    align-items: stretch;
  }

  .results-actions {
    justify-content: stretch;
  }

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

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