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

:root {
  --bg-primary: #0f0f11;
  --bg-secondary: #1a1a1e;
  --bg-card: #232329;
  --bg-hover: #2a2a32;
  --text-primary: #e8e8ea;
  --text-secondary: #92929a;
  --text-muted: #6b6b73;
  --accent: #2ea6ff;
  --accent-hover: #5bb8ff;
  --success: #4ade80;
  --danger: #f87171;
  --warning: #fbbf24;
  --border: #2e2e36;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --transition: 0.2s ease;
}

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

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header */
.header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 800px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--accent);
}

.user-area {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.user-photo {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
}

.user-name {
  font-size: 0.875rem;
  font-weight: 500;
}

.login-area {
  display: flex;
  align-items: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  font-family: inherit;
}

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

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

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

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

.btn-outline:hover:not(:disabled) {
  background: var(--bg-hover);
  border-color: var(--text-muted);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  padding: 0.25rem 0.5rem;
}

.btn-ghost:hover {
  color: var(--text-primary);
}

.btn-small {
  padding: 0.25rem 0.75rem;
  font-size: 0.8125rem;
}

.btn-lg {
  padding: 0.75rem 2rem;
  font-size: 1rem;
}

.link {
  color: var(--accent);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.link:hover {
  color: var(--accent-hover);
}

/* Main */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.section {
  padding: 2rem 1.5rem;
  flex: 1;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

/* Dropzone */
.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--bg-secondary);
}

.dropzone:hover {
  border-color: var(--accent);
  background: var(--bg-hover);
}

.dropzone.dragover {
  border-color: var(--accent);
  background: rgba(46, 166, 255, 0.08);
  transform: scale(1.01);
}

.dropzone.has-file {
  border-color: var(--success);
  border-style: solid;
}

.dropzone-icon {
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.dropzone.dragover .dropzone-icon {
  color: var(--accent);
}

.dropzone-text {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.dropzone-hint {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

.file-input {
  display: none;
}

/* File info */
.file-info {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

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

.file-icon {
  font-size: 1.25rem;
}

.file-name {
  flex: 1;
  font-weight: 500;
  font-size: 0.9rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-size {
  color: var(--text-muted);
  font-size: 0.8125rem;
  white-space: nowrap;
}

/* Actions */
.actions {
  margin-top: 1.5rem;
}

.actions-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.actions-hint {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.action-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
}

.action-card {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  text-align: left;
  font-family: inherit;
  color: inherit;
}

.action-card:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.action-card:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
}

.action-icon {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

.action-title {
  font-weight: 600;
  font-size: 0.9rem;
}

.action-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.action-card.selected {
  border-color: var(--accent);
  background: rgba(46, 166, 255, 0.1);
}

/* Edit form */
.edit-form {
  margin-top: 1.5rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.375rem;
}

.form-input {
  width: 100%;
  padding: 0.625rem 0.875rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.875rem;
  font-family: inherit;
  transition: border-color var(--transition);
}

.form-input:focus {
  outline: none;
  border-color: var(--accent);
}

.form-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

/* AI options */
.ai-options {
  margin-top: 1.5rem;
}

.ai-options .action-cards {
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
}

/* Quota bar */
.quota-bar {
  margin-top: 2rem;
  padding: 0.75rem 1rem;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.quota-info {
  display: flex;
  gap: 1.5rem;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
}

.quota-info strong {
  color: var(--text-primary);
}

/* Result */
.result-section {
  margin-top: 1.5rem;
}

.result-error {
  padding: 1rem;
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid var(--danger);
  border-radius: var(--radius-sm);
  color: var(--danger);
  font-size: 0.875rem;
}

.result-success {
  text-align: center;
}

.result-title {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

.metadata-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
  text-align: left;
}

@media (max-width: 600px) {
  .metadata-comparison {
    grid-template-columns: 1fr;
  }
}

.metadata-col h3 {
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.metadata-pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  font-size: 0.8125rem;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text-secondary);
  min-height: 80px;
}

.result-loading {
  text-align: center;
  padding: 3rem 0;
  color: var(--text-muted);
}

/* Spinner */
.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 1rem;
}

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

/* Footer */
.footer {
  padding: 1rem 1.5rem;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.75rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.875rem;
  z-index: 1000;
  box-shadow: var(--shadow);
  animation: toastIn 0.3s ease;
}

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

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

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(1rem);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

/* Auth loading */
.auth-loading {
  position: fixed;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.5rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  color: var(--text-muted);
  z-index: 999;
}

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

::-webkit-scrollbar-track {
  background: transparent;
}

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

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