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

:root {
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --ink: #111827;
  --ink-soft: #4b5563;
  --ink-muted: #9ca3af;
  --line: #e5e7eb;
  --surface: #ffffff;
  --bg: #f9fafb;
  --success: #15803d;
  --success-bg: #f0fdf4;
  --danger: #b91c1c;
  --danger-bg: #fef2f2;
  --warning: #b45309;
  --warning-bg: #fffbeb;
  --radius: 8px;
  --radius-sm: 6px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, monospace;
}

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

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink);
  background: var(--bg);
  min-height: 100vh;
}

/* ── Layout ──────────────────────────────────────────────── */
.app-shell {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 16px;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.app-title {
  font-size: 24px;
  font-weight: 700;
  line-height: 1.2;
  text-wrap: balance;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--ink-soft);
}

.breadcrumb a {
  color: var(--accent);
  text-decoration: none;
  cursor: pointer;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb-sep {
  color: var(--ink-muted);
}

/* ── Cards ───────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--line);
  gap: 12px;
  flex-wrap: wrap;
}

.card-title {
  font-size: 16px;
  font-weight: 600;
}

.card-body {
  padding: 20px;
}

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  font-family: var(--font);
  line-height: 1.4;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  min-height: 40px;
  min-width: 40px;
  transition: background-color 0.15s ease-out, border-color 0.15s ease-out;
  text-decoration: none;
}

.btn:active {
  transform: scale(0.96);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

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

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

.btn-secondary {
  background: var(--surface);
  border-color: var(--line);
  color: var(--ink);
}

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

.btn-danger {
  background: var(--surface);
  border-color: var(--danger);
  color: var(--danger);
}

.btn-danger:hover:not(:disabled) {
  background: var(--danger-bg);
}

.btn-sm {
  padding: 4px 10px;
  font-size: 13px;
  min-height: 32px;
}

.btn-icon {
  padding: 6px;
  min-width: 32px;
  min-height: 32px;
}

/* ── Form elements ───────────────────────────────────────── */
.input {
  display: block;
  width: 100%;
  padding: 8px 12px;
  font-size: 14px;
  font-family: var(--font);
  line-height: 1.5;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.15s ease-out;
  min-height: 40px;
}

.input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.input-group {
  display: flex;
  gap: 8px;
}

.input-group .input {
  flex: 1;
}

/* ── Drop zone ───────────────────────────────────────────── */
.dropzone {
  border: 2px dashed var(--line);
  border-radius: var(--radius);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease-out, background-color 0.15s ease-out;
  position: relative;
}

.dropzone:hover {
  border-color: var(--ink-muted);
}

.dropzone.drag-over {
  border-color: var(--accent);
  background: rgba(37, 99, 235, 0.04);
}

.dropzone-icon {
  font-size: 40px;
  margin-bottom: 12px;
  display: block;
}

.dropzone-text {
  font-size: 16px;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 4px;
}

.dropzone-hint {
  font-size: 14px;
  color: var(--ink-soft);
}

.dropzone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

/* ── File list ───────────────────────────────────────────── */
.file-list {
  list-style: none;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}

.file-item:last-child {
  border-bottom: none;
}

.file-icon {
  font-size: 20px;
  flex-shrink: 0;
  width: 24px;
  text-align: center;
}

.file-name {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 500;
}

.file-size {
  color: var(--ink-soft);
  font-size: 13px;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.file-date {
  color: var(--ink-muted);
  font-size: 13px;
  white-space: nowrap;
}

.file-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

/* ── Project grid ────────────────────────────────────────── */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: border-color 0.15s ease-out, box-shadow 0.15s ease-out;
  text-align: center;
}

.project-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

.project-card:active {
  transform: scale(0.98);
}

.project-card-icon {
  font-size: 32px;
  margin-bottom: 8px;
  display: block;
}

.project-card-name {
  font-size: 15px;
  font-weight: 600;
  word-break: break-word;
}

/* ── Conflict modal ──────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 16px;
}

.modal-overlay[hidden] {
  display: none;
}

.modal {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  max-width: 560px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--line);
}

.modal-title {
  font-size: 18px;
  font-weight: 700;
}

.modal-body {
  padding: 20px;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 16px 20px;
  border-top: 1px solid var(--line);
}

.conflict-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}

.conflict-item:last-child {
  border-bottom: none;
}

.conflict-check {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  accent-color: var(--accent);
}

.conflict-info {
  flex: 1;
  min-width: 0;
}

.conflict-name {
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.conflict-detail {
  font-size: 12px;
  color: var(--ink-soft);
}

/* ── Progress bar ────────────────────────────────────────── */
.progress-bar {
  height: 4px;
  background: var(--line);
  border-radius: 2px;
  overflow: hidden;
  margin-top: 8px;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.3s ease-out;
  width: 0%;
}

/* ── Upload queue ────────────────────────────────────────── */
.upload-queue {
  margin-top: 16px;
}

.upload-queue[hidden] {
  display: none;
}

.queue-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.queue-title {
  font-size: 14px;
  font-weight: 600;
}

.queue-count {
  font-size: 13px;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
}

.queue-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  font-size: 13px;
}

.queue-item-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.queue-item-status {
  font-size: 12px;
  font-weight: 500;
  white-space: nowrap;
}

.status-pending { color: var(--ink-muted); }
.status-uploading { color: var(--accent); }
.status-done { color: var(--success); }
.status-failed { color: var(--danger); }
.status-skipped { color: var(--warning); }

/* ── Empty state ─────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--ink-soft);
}

.empty-state-icon {
  font-size: 48px;
  margin-bottom: 12px;
  display: block;
}

.empty-state-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
}

.empty-state-text {
  font-size: 14px;
  margin-bottom: 16px;
  text-wrap: pretty;
}

/* ── Toast notifications ─────────────────────────────────── */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  animation: toast-in 0.2s ease-out;
  max-width: 360px;
}

.toast-success {
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid #bbf7d0;
}

.toast-error {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid #fecaca;
}

.toast-info {
  background: #eff6ff;
  color: var(--accent);
  border: 1px solid #bfdbfe;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Loading spinner ─────────────────────────────────────── */
.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid var(--line);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 600px) {
  .app-shell {
    padding: 16px 12px;
  }

  .app-header {
    margin-bottom: 24px;
  }

  .app-title {
    font-size: 20px;
  }

  .file-item {
    padding: 10px 12px;
    gap: 8px;
  }

  .file-date {
    display: none;
  }

  .project-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 12px;
  }

  .dropzone {
    padding: 32px 16px;
  }

  .modal {
    max-height: 90vh;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}