@import url('https://fonts.googleapis.com/css2?family=Google+Sans+Flex:opsz,wght@10..72,400..700&display=swap');

:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --border: #ececec;
  --border-strong: #d4d4d4;
  --brand: #1f3a5f;
  --brand-hover: #2a4d7a;
  --brand-soft: #eef2f7;
  --text: #1a1a1a;
  --text-muted: #6b6b6b;
  --text-subtle: #9a9a9a;
  --success: #16a34a;
  --success-soft: #ecfdf5;
  --warning: #d97706;
  --warning-soft: #fef3c7;
  --danger: #dc2626;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.06);
  --radius: 12px;
  --radius-sm: 8px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --max-w: 720px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Google Sans Flex', system-ui, -apple-system, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-variation-settings: "opsz" 14;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { font-weight: 600; letter-spacing: -0.01em; margin: 0; }
h1 { font-size: 28px; font-weight: 700; letter-spacing: -0.02em; }
h2 { font-size: 20px; }
h3 { font-size: 16px; }

p { margin: 0; color: var(--text-muted); }

.shell {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--space-7) var(--space-5) var(--space-8);
}

.shell-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-7);
  min-height: 36px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  color: var(--text-muted);
  font-size: 14px;
  padding: 6px 10px 6px 6px;
  border-radius: var(--radius-sm);
  transition: background 120ms ease, color 120ms ease;
}
.back-link:hover {
  background: var(--brand-soft);
  color: var(--brand);
  text-decoration: none;
}
.back-link svg { width: 16px; height: 16px; }

.shell-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-5);
}

.card + .card { margin-top: var(--space-4); }

.muted { color: var(--text-muted); }
.subtle { color: var(--text-subtle); font-size: 13px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 10px 18px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  font-variation-settings: "opsz" 14;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease, box-shadow 120ms ease;
  background: transparent;
  color: var(--text);
}
.btn svg { width: 18px; height: 18px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary {
  background: var(--brand);
  color: #fff;
  border-color: var(--brand);
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover:not(:disabled) { background: var(--brand-hover); border-color: var(--brand-hover); }

.btn-ghost {
  background: var(--surface);
  border-color: var(--border-strong);
  color: var(--text);
}
.btn-ghost:hover:not(:disabled) { background: var(--brand-soft); border-color: var(--brand); color: var(--brand); }

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-4);
}

.tool-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-5);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  transition: border-color 120ms ease, box-shadow 120ms ease, transform 120ms ease;
}
.tool-card:hover {
  border-color: var(--brand);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  transform: translateY(-1px);
}
.tool-card-icon {
  width: 40px; height: 40px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--brand-soft);
  color: var(--brand);
  border-radius: 10px;
}
.tool-card-icon svg { width: 22px; height: 22px; }
.tool-card-title { font-size: 16px; font-weight: 600; }
.tool-card-desc { color: var(--text-muted); font-size: 14px; }

@keyframes spin { to { transform: rotate(360deg); } }
.spin { animation: spin 1s linear infinite; }

.hidden { display: none !important; }

.dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-7) var(--space-5);
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  text-align: center;
  transition: border-color 120ms ease, background 120ms ease, color 120ms ease;
}
.dropzone:hover { border-color: var(--brand); background: var(--brand-soft); color: var(--brand); }
.dropzone.is-dragging { border-color: var(--brand); background: var(--brand-soft); color: var(--brand); border-style: solid; }
.dropzone svg { width: 32px; height: 32px; }
.dropzone-hint { font-size: 13px; color: var(--text-subtle); }

.file-chips {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-4);
}
.file-chip {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 10px var(--space-3);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
}
.file-chip svg { width: 18px; height: 18px; color: var(--text-muted); flex-shrink: 0; }
.file-chip-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-chip-size { color: var(--text-subtle); font-size: 12px; flex-shrink: 0; }
.file-chip-remove {
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  color: var(--text-subtle);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.file-chip-remove:hover { background: var(--bg); color: var(--danger); }
.file-chip-remove svg { width: 16px; height: 16px; }

.action-row {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  margin: var(--space-5) 0;
}
.action-row .btn { min-width: 200px; }

.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: var(--space-4);
  margin: var(--space-4) 0;
}
.stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.stat-label { font-size: 12px; color: var(--text-subtle); text-transform: uppercase; letter-spacing: 0.04em; }
.stat-value { font-size: 18px; font-weight: 600; font-variant-numeric: tabular-nums; }

.headline-number {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--text);
}
.headline-label { font-size: 13px; color: var(--text-muted); margin-bottom: 2px; }

.kv-table {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}
.kv-table th, .kv-table td { text-align: left; padding: 8px 0; border-bottom: 1px solid var(--border); font-weight: 400; }
.kv-table th { color: var(--text-muted); font-size: 13px; font-weight: 500; }
.kv-table td:last-child, .kv-table th:last-child { text-align: right; }
.kv-table tr:last-child td { border-bottom: none; }

.flag-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-3);
}
.flag {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: 10px var(--space-3);
  border-radius: var(--radius-sm);
  font-size: 14px;
  background: var(--warning-soft);
  color: #92400e;
}
.flag svg { width: 18px; height: 18px; flex-shrink: 0; margin-top: 1px; }
.flag.is-success { background: var(--success-soft); color: #065f46; }

.indicator {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
}
.indicator svg { width: 16px; height: 16px; }
.indicator.is-success { color: var(--success); }
.indicator.is-warning { color: var(--warning); }

.download-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-5);
  padding-top: var(--space-5);
  border-top: 1px solid var(--border);
}
.download-row .btn { flex: 1; min-width: 200px; }

.section-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-subtle);
  margin: var(--space-5) 0 var(--space-2);
}
.section-label:first-child { margin-top: 0; }

.error-banner {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: #fef2f2;
  color: var(--danger);
  border: 1px solid #fecaca;
  border-radius: var(--radius-sm);
  font-size: 14px;
  margin-top: var(--space-4);
}
.error-banner svg { width: 18px; height: 18px; flex-shrink: 0; margin-top: 1px; }

.config-section {
  margin-top: var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.config-section > summary {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  list-style: none;
  user-select: none;
  transition: background 120ms ease;
}
.config-section > summary::-webkit-details-marker { display: none; }
.config-section > summary:hover { background: var(--brand-soft); }
.config-section > summary svg { width: 16px; height: 16px; color: var(--text-muted); }
.config-section > summary > span { flex: 1; }
.config-chevron { transition: transform 160ms ease; }
.config-section[open] > summary .config-chevron { transform: rotate(180deg); }
.config-section[open] > summary { border-bottom: 1px solid var(--border); }

.config-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-4);
  padding: var(--space-4);
}
.config-field { display: flex; flex-direction: column; gap: var(--space-1); }
.config-field-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}
.config-field label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
}
.config-unit {
  font-size: 12px;
  font-weight: 400;
  color: var(--text-subtle);
}
.config-field input[type="number"] {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  background: var(--surface);
  color: var(--text);
  transition: border-color 120ms ease, box-shadow 120ms ease;
}
.config-field input[type="number"]:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px var(--brand-soft);
}
.config-help {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.4;
  margin-top: 2px;
}
.config-footer {
  padding: 0 var(--space-4) var(--space-4);
  display: flex;
  justify-content: flex-end;
}
.config-reset-link {
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-family: inherit;
  font-size: 13px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background 120ms ease, color 120ms ease;
}
.config-reset-link:hover { background: var(--brand-soft); color: var(--brand); }
.config-reset-link svg { width: 14px; height: 14px; }