/* ============================================
   S3 to HF Bucket Importer - Dark Theme
   Inspired by HF Buckets announcement design
   ============================================ */

:root {
  --bg-primary: #0a0e14;
  --bg-secondary: #131920;
  --bg-card: #161b22;
  --bg-input: #0d1117;
  --bg-hover: #1c2330;

  --border: #30363d;
  --border-focus: #40c9a2;

  --accent: #40c9a2;
  --accent-hover: #36b393;
  --accent-subtle: rgba(64, 201, 162, 0.1);

  --text-primary: #f0f0f0;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;

  --error: #f85149;
  --error-bg: rgba(248, 81, 73, 0.1);
  --success: #3fb950;
  --success-bg: rgba(63, 185, 80, 0.1);
  --warning: #d29922;
  --warning-bg: rgba(210, 153, 34, 0.1);

  --radius: 8px;
  --radius-sm: 4px;
  --radius-lg: 12px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.4);
}

/* ---- Reset & Base ---- */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* ---- Layout ---- */

.app-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 24px 20px 80px;
}

/* ---- Header ---- */

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

.app-header .logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
}

.app-header .logo-icon {
  font-size: 24px;
}

.app-header .logo-text {
  font-size: 18px;
  font-weight: 600;
}

.app-header .logo-text span {
  color: var(--accent);
}

.user-info {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-secondary);
}

.user-info img {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--border);
}

.user-info .username {
  font-weight: 500;
  color: var(--text-primary);
}

.btn-sign-out {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 13px;
  transition: all 0.15s;
}

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

/* ---- Sign-in Screen ---- */

.sign-in-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
}

.sign-in-screen .hero-icon {
  font-size: 64px;
  margin-bottom: 24px;
}

.sign-in-screen h1 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.sign-in-screen h1 span {
  color: var(--accent);
}

.sign-in-screen .subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 460px;
  line-height: 1.7;
}

.btn-sign-in {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--accent);
  color: #000;
  font-size: 16px;
  font-weight: 600;
  padding: 14px 32px;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.15s;
  box-shadow: var(--shadow);
}

.btn-sign-in:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn-sign-in:active {
  transform: translateY(0);
}

.btn-sign-in svg {
  width: 22px;
  height: 22px;
}

.sign-in-screen .features {
  margin-top: 48px;
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  justify-content: center;
}

.sign-in-screen .feature {
  text-align: center;
  max-width: 180px;
}

.sign-in-screen .feature-icon {
  font-size: 28px;
  margin-bottom: 8px;
}

.sign-in-screen .feature h3 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
}

.sign-in-screen .feature p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ---- Card / Section ---- */

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}

.card-header .step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: #000;
  font-size: 14px;
  font-weight: 700;
  flex-shrink: 0;
}

.card-header h2 {
  font-size: 18px;
  font-weight: 600;
}

.card-header .card-status {
  margin-left: auto;
  font-size: 13px;
  padding: 2px 10px;
  border-radius: 12px;
  font-weight: 500;
}

.card-header .card-status.connected {
  background: var(--success-bg);
  color: var(--success);
}

/* ---- Forms ---- */

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

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

.form-group.full-width {
  grid-column: 1 / -1;
}

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

.form-group label .required {
  color: var(--error);
}

.form-group input,
.form-group select {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
  font-size: 14px;
  color: var(--text-primary);
  font-family: var(--font-sans);
  transition: border-color 0.15s;
  width: 100%;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px var(--accent-subtle);
}

.form-group input::placeholder {
  color: var(--text-muted);
}

.form-group .hint {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ---- Field Help / Tooltips ---- */

.label-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.help-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  font-size: 10px;
  font-weight: 700;
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.15s;
  padding: 0;
  line-height: 1;
  font-family: var(--font-sans);
}

.help-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-subtle);
}

.field-help {
  display: none;
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.6;
  padding: 8px 10px;
  margin-top: 2px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.field-help.visible {
  display: block;
}

.field-help code {
  background: var(--bg-input);
  padding: 1px 5px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
}

.field-help a {
  color: var(--accent);
}

.section-help {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
  padding: 12px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.section-help a {
  color: var(--accent);
}

.form-row {
  display: flex;
  gap: 16px;
  align-items: flex-end;
}

.form-row .form-group {
  flex: 1;
}

/* ---- Buttons ---- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

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

.btn-primary {
  background: var(--accent);
  color: #000;
}

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

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

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

.btn-sm {
  font-size: 13px;
  padding: 6px 14px;
}

.btn-full {
  width: 100%;
}

.form-actions {
  margin-top: 20px;
  display: flex;
  gap: 12px;
  align-items: center;
}

/* ---- Loading spinner ---- */

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* ---- Alert / Messages ---- */

.alert {
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 14px;
  line-height: 1.5;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.alert-error {
  background: var(--error-bg);
  border: 1px solid rgba(248, 81, 73, 0.3);
  color: var(--error);
}

.alert-success {
  background: var(--success-bg);
  border: 1px solid rgba(63, 185, 80, 0.3);
  color: var(--success);
}

.alert-warning {
  background: var(--warning-bg);
  border: 1px solid rgba(210, 153, 34, 0.3);
  color: var(--warning);
}

.alert-info {
  background: var(--accent-subtle);
  border: 1px solid rgba(64, 201, 162, 0.3);
  color: var(--accent);
}

.alert .alert-icon {
  flex-shrink: 0;
  font-size: 16px;
}

/* ---- File Browser / Tree View ---- */

.file-browser-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 12px;
}

.file-browser-stats {
  font-size: 13px;
  color: var(--text-secondary);
  display: flex;
  gap: 16px;
}

.file-browser-stats .stat-value {
  color: var(--text-primary);
  font-weight: 600;
}

.file-browser-actions {
  display: flex;
  gap: 8px;
}

.tree-container {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-input);
  max-height: 450px;
  overflow-y: auto;
  overflow-x: auto;
}

.tree-container::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.tree-container::-webkit-scrollbar-track {
  background: transparent;
}

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

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

.tree-node {
  display: flex;
  align-items: center;
  padding: 6px 12px;
  gap: 8px;
  cursor: pointer;
  font-size: 14px;
  border-bottom: 1px solid rgba(48, 54, 61, 0.4);
  transition: background 0.1s;
  white-space: nowrap;
}

.tree-node:hover {
  background: var(--bg-hover);
}

.tree-node:last-child {
  border-bottom: none;
}

.tree-node .indent {
  flex-shrink: 0;
}

.tree-node .expand-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 12px;
  transition: transform 0.15s;
}

.tree-node .expand-icon.expanded {
  transform: rotate(90deg);
}

.tree-node .expand-icon.hidden {
  visibility: hidden;
}

.tree-node .node-checkbox {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  accent-color: var(--accent);
  cursor: pointer;
}

.tree-node .node-icon {
  flex-shrink: 0;
  font-size: 14px;
  width: 18px;
  text-align: center;
}

.tree-node .node-name {
  font-family: var(--font-mono);
  font-size: 13px;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tree-node .node-meta {
  font-size: 12px;
  color: var(--text-muted);
  flex-shrink: 0;
  margin-left: auto;
  padding-left: 16px;
  font-family: var(--font-mono);
}

.tree-node.loading .node-name {
  color: var(--text-muted);
  font-style: italic;
}

.tree-load-more {
  padding: 8px 12px;
  font-size: 13px;
  color: var(--accent);
  cursor: pointer;
  text-align: center;
  border-bottom: 1px solid rgba(48, 54, 61, 0.4);
}

.tree-load-more:hover {
  background: var(--bg-hover);
}

/* ---- CORS Fallback ---- */

.cors-fallback {
  margin-top: 16px;
}

.cors-fallback .cors-help {
  margin-top: 12px;
}

.cors-fallback details {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  background: var(--bg-secondary);
}

.cors-fallback details summary {
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
}

.cors-fallback details pre {
  margin-top: 12px;
  padding: 12px;
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  line-height: 1.5;
}

.manual-patterns {
  margin-top: 16px;
}

.manual-patterns textarea {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--text-primary);
  resize: vertical;
  min-height: 60px;
  line-height: 1.5;
}

.manual-patterns textarea:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px var(--accent-subtle);
}

/* ---- Destination Config ---- */

.dest-preview {
  margin-top: 12px;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  word-break: break-all;
}

/* ---- Import Config ---- */

.config-row {
  display: flex;
  gap: 16px;
  margin-bottom: 16px;
}

.config-row .form-group {
  flex: 1;
}

.patterns-preview {
  margin-top: 12px;
  padding: 12px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
  max-height: 120px;
  overflow-y: auto;
  line-height: 1.6;
  white-space: pre-wrap;
}

/* ---- Job Status ---- */

.job-status-card {
  text-align: center;
  padding: 32px 24px;
}

.job-status-card .status-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.job-status-card h3 {
  font-size: 20px;
  margin-bottom: 8px;
}

.job-status-card .job-id {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.job-status-card .job-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
}

.job-status-card .job-link:hover {
  text-decoration: underline;
}

.job-status-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
}

.job-status-badge.scheduling {
  background: var(--warning-bg);
  color: var(--warning);
}

.job-status-badge.running {
  background: var(--accent-subtle);
  color: var(--accent);
}

.job-status-badge.completed {
  background: var(--success-bg);
  color: var(--success);
}

.job-status-badge.error {
  background: var(--error-bg);
  color: var(--error);
}

/* ---- Utility ---- */

.hidden {
  display: none !important;
}

.text-muted {
  color: var(--text-secondary);
}

.text-accent {
  color: var(--accent);
}

.text-mono {
  font-family: var(--font-mono);
}

.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.mt-6 { margin-top: 24px; }

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 20px 0;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ---- Responsive ---- */

@media (max-width: 640px) {
  .app-container {
    padding: 16px 12px 60px;
  }

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

  .config-row {
    flex-direction: column;
  }

  .sign-in-screen h1 {
    font-size: 24px;
  }

  .sign-in-screen .features {
    flex-direction: column;
    align-items: center;
  }

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

  .app-header {
    flex-wrap: wrap;
    gap: 8px;
  }
}