:root {
  --primary: #1E40AF;
  --primary-hover: #1e3a8a;
  --primary-light: #eff6ff;
  --blue-500: #3b82f6;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --red-500: #dc2626;
  --green-600: #16a34a;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow: 0 4px 12px rgba(0,0,0,.08);
  --radius: 10px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--gray-800);
  background: #f1f5f9;
  font-size: 14px;
  line-height: 1.6;
}

/* ===== Header ===== */
.app-header {
  background: #fff;
  border-bottom: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
  position: sticky; top: 0; z-index: 50;
}
.header-content {
  max-width: 1180px; margin: 0 auto; padding: 12px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.header-left { display: flex; align-items: center; gap: 12px; }
.logo {
  width: 44px; height: 44px; border-radius: 10px;
  background: linear-gradient(135deg, #2563eb, #1e40af);
  color: #fff; display: flex; align-items: center; justify-content: center;
}
.header-text h1 { margin: 0; font-size: 18px; font-weight: 700; color: var(--gray-800); }
.header-text .subtitle { margin: 0; font-size: 12px; color: var(--gray-500); }
.header-right { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.mode-indicator {
  font-size: 12px; padding: 4px 10px; border-radius: 20px; font-weight: 600;
}
.rule-mode { background: #ecfdf5; color: #047857; }

.user-badge {
  font-size: 13px; font-weight: 600; color: var(--primary);
  background: var(--primary-light); padding: 5px 12px; border-radius: 20px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 14px; font-weight: 600; cursor: pointer;
  border: 1px solid transparent; border-radius: 8px; padding: 8px 16px;
  transition: all .15s; font-family: inherit;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-outline { background: #fff; color: var(--gray-700); border-color: var(--gray-300); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-ghost { background: transparent; color: var(--gray-500); }
.btn-ghost:hover { background: var(--gray-100); color: var(--gray-700); }
.btn-large { padding: 12px 28px; font-size: 15px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* ===== Main ===== */
.main-content { max-width: 1180px; margin: 0 auto; padding: 24px; }
.step-panel { display: none; }
.step-panel.active { display: block; }
.section-title {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  margin-bottom: 16px; flex-wrap: wrap;
}
.section-title h2 { margin: 0; font-size: 20px; font-weight: 700; }
.section-hint { font-size: 12px; color: var(--gray-500); }

/* ===== Tabs ===== */
.input-tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--gray-200); margin-bottom: 18px; flex-wrap: wrap; }
.input-tab {
  background: none; border: none; cursor: pointer; font-family: inherit;
  padding: 10px 18px; font-size: 14px; font-weight: 600; color: var(--gray-500);
  border-bottom: 2px solid transparent; display: flex; align-items: center; gap: 6px;
}
.input-tab:hover { color: var(--gray-700); }
.input-tab.active { color: var(--primary); border-bottom-color: var(--primary); }
.input-panel { display: none; }
.input-panel.active { display: block; }

/* ===== Upload ===== */
.upload-area {
  border: 2px dashed var(--gray-300); border-radius: var(--radius);
  padding: 40px 20px; text-align: center; cursor: pointer; background: #fff;
  transition: all .15s;
}
.upload-area:hover, .upload-area.dragover { border-color: var(--primary); background: var(--primary-light); }
.upload-icon { color: var(--gray-400); margin-bottom: 8px; }
.upload-text { font-size: 15px; font-weight: 600; margin: 0 0 4px; }
.upload-link { color: var(--primary); }
.upload-hint { font-size: 12px; color: var(--gray-500); margin: 0; }

/* ===== Param form ===== */
.param-form {
  background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow-sm);
  display: grid; grid-template-columns: 1fr 1fr; gap: 14px 24px;
}
.param-row { display: flex; align-items: center; gap: 12px; }
.param-row label { flex: 0 0 130px; font-size: 13px; font-weight: 600; color: var(--gray-600); }
.param-row.param-wide { grid-column: 1 / -1; }
.param-row input[type="text"], .param-row input[type="number"], .param-row select {
  flex: 1; padding: 8px 10px; border: 1px solid var(--gray-300); border-radius: 7px;
  font-size: 13px; font-family: inherit; color: var(--gray-800); background: #fff;
}
.param-row input:focus, .param-row select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(30,64,175,.12); }
.param-subtitle {
  grid-column: 1 / -1; font-size: 14px; font-weight: 700; color: var(--primary);
  margin-top: 8px; padding-top: 12px; border-top: 1px dashed var(--gray-200);
}
.param-actions { grid-column: 1 / -1; display: flex; align-items: center; gap: 12px; margin-top: 4px; }
.form-hint { font-size: 12px; color: var(--gray-500); }
.trim-tiers { grid-column: 1 / -1; display: flex; flex-direction: column; gap: 8px; }
.trim-tier {
  display: flex; gap: 14px; align-items: center; flex-wrap: wrap;
  background: var(--gray-50); border: 1px solid var(--gray-200); border-radius: 8px; padding: 8px 12px;
  font-size: 13px;
}
.trim-tier input[type="number"] { width: 46px; padding: 4px 6px; border: 1px solid var(--gray-300); border-radius: 5px; font-size: 13px; }
.trim-tier input[type="checkbox"] { width: 15px; height: 15px; }

/* ===== Presets ===== */
.preset-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.preset-card {
  background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius);
  padding: 16px; cursor: pointer; transition: all .15s; box-shadow: var(--shadow-sm);
}
.preset-card:hover { border-color: var(--primary); box-shadow: var(--shadow); transform: translateY(-2px); }
.preset-card h4 { margin: 0 0 6px; font-size: 15px; color: var(--gray-800); }
.preset-card p { margin: 0; font-size: 12px; color: var(--gray-500); line-height: 1.6; }

/* ===== Price calc table ===== */
.price-calc-info {
  background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius);
  padding: 14px 16px; margin-bottom: 14px; font-size: 13px; line-height: 1.9; box-shadow: var(--shadow-sm);
}
.price-calc-table-wrap { overflow-x: auto; }
.comparison-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); font-size: 13px; }
.comparison-table th, .comparison-table td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--gray-100); }
.comparison-table thead th { background: var(--primary); color: #fff; font-weight: 600; font-size: 12px; white-space: nowrap; }
.comparison-table tbody tr:hover { background: var(--gray-50); }
.comparison-table tfoot td { background: var(--gray-50); font-weight: 600; font-size: 12px; }
.price-calc-input { width: 100%; padding: 6px 8px; border: 1px solid var(--gray-300); border-radius: 6px; font-size: 13px; font-family: inherit; }
.price-calc-input:focus { outline: none; border-color: var(--primary); }
.price-calc-deviation.positive { color: var(--red-500); font-weight: 600; }
.price-calc-deviation.negative { color: var(--green-600); font-weight: 600; }
.price-calc-score { font-weight: 700; color: var(--primary); }
.price-calc-row-delete {
  border: none; background: none; color: var(--gray-400); cursor: pointer; font-size: 18px; line-height: 1;
}
.price-calc-row-delete:hover { color: var(--red-500); }

/* ===== Empty state ===== */
.empty-state { background: #fff; border: 1px dashed var(--gray-300); border-radius: var(--radius); text-align: center; }
.empty-state-text { color: var(--gray-500); font-size: 14px; }

/* ===== Toast ===== */
.toast {
  position: fixed; top: 20px; left: 50%; transform: translateX(-50%);
  background: var(--gray-800); color: #fff; padding: 10px 20px; border-radius: 8px;
  font-size: 14px; z-index: 200; box-shadow: var(--shadow); animation: toastIn .2s;
}
.toast.success { background: #047857; }
.toast.error { background: #b91c1c; }
.toast.warning { background: #b45309; }
@keyframes toastIn { from { opacity: 0; transform: translate(-50%, -10px); } to { opacity: 1; transform: translate(-50%, 0); } }

/* ===== Loading ===== */
.loading-overlay {
  position: fixed; inset: 0; background: rgba(255,255,255,.7); backdrop-filter: blur(2px);
  display: flex; flex-direction: column; align-items: center; justify-content: center; z-index: 150;
}
.loading-spinner {
  width: 40px; height: 40px; border: 4px solid var(--gray-200); border-top-color: var(--primary);
  border-radius: 50%; animation: spin .8s linear infinite;
}
.loading-text { margin-top: 12px; color: var(--gray-600); font-size: 14px; font-weight: 600; }
@keyframes spin { to { transform: rotate(360deg); } }
.inline-loading { font-size: 13px; color: var(--primary); margin-top: 8px; }

/* ===== Modal ===== */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(15,23,42,.5);
  display: flex; align-items: center; justify-content: center; z-index: 100; padding: 20px;
}
.modal { background: #fff; border-radius: 14px; width: 100%; max-width: 460px; box-shadow: var(--shadow); overflow: hidden; }
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 18px 22px; border-bottom: 1px solid var(--gray-200); }
.modal-header h3 { margin: 0; font-size: 17px; }
.modal-close { border: none; background: none; font-size: 26px; cursor: pointer; color: var(--gray-400); line-height: 1; }
.modal-close:hover { color: var(--gray-700); }
.modal-body { padding: 22px; }
.modal-footer { display: flex; justify-content: flex-end; gap: 10px; padding: 16px 22px; border-top: 1px solid var(--gray-200); }
.form-group { margin-bottom: 16px; }
.form-label { display: block; font-size: 13px; font-weight: 600; color: var(--gray-600); margin-bottom: 6px; }
.form-input { width: 100%; padding: 10px 12px; border: 1px solid var(--gray-300); border-radius: 8px; font-size: 14px; font-family: inherit; }
.form-input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(30,64,175,.12); }
.auth-error { background: #fef2f2; color: #b91c1c; padding: 10px 14px; border-radius: 8px; font-size: 13px; margin-bottom: 14px; }
.auth-switch { text-align: center; margin-top: 14px; font-size: 13px; color: var(--gray-500); }
.auth-switch a { color: var(--primary); cursor: pointer; text-decoration: none; }
.mode-selector { display: flex; gap: 12px; }
.model-option { flex: 1; border: 1px solid var(--gray-300); border-radius: 10px; padding: 12px; cursor: pointer; }
.model-option:has(input:checked) { border-color: var(--primary); background: var(--primary-light); }
.model-option-content { display: flex; flex-direction: column; gap: 4px; }
.model-option-name { font-size: 14px; font-weight: 600; }
.model-option-hint { font-size: 11px; color: var(--gray-500); }
.server-key-banner { background: #ecfdf5; color: #047857; padding: 8px 12px; border-radius: 8px; font-size: 12px; margin-bottom: 12px; }
#modelKeyList .model-key-item { display: flex; flex-direction: column; gap: 4px; border: 1px solid var(--gray-200); border-radius: 8px; padding: 10px 12px; }
.model-key-item .mki-head { display: flex; justify-content: space-between; font-size: 13px; font-weight: 600; }
.model-key-item .mki-hint { font-size: 11px; color: var(--gray-500); }
.model-key-item input { padding: 7px 10px; border: 1px solid var(--gray-300); border-radius: 6px; font-size: 13px; font-family: inherit; }
.model-key-item .mki-server { font-size: 11px; color: #047857; }

/* ===== Admin ===== */
.admin-tab.active { color: var(--primary); border-bottom: 2px solid var(--primary); }
.admin-panel { display: none; }
.admin-panel.active { display: block; }
.table-wrap { overflow-x: auto; }
.comparison-table .badge { display: inline-block; padding: 2px 8px; border-radius: 12px; font-size: 11px; font-weight: 600; }
.badge-active { background: #ecfdf5; color: #047857; }
.badge-disabled { background: #fef2f2; color: #b91c1c; }
.badge-admin { background: var(--primary-light); color: var(--primary); }
.btn-sm { padding: 4px 10px; font-size: 12px; }

/* ===== Footer ===== */
.app-footer { text-align: center; padding: 20px; color: var(--gray-400); font-size: 12px; }

@media (max-width: 720px) {
  .param-form { grid-template-columns: 1fr; }
  .param-row label { flex-basis: 110px; }
  .header-text .subtitle { display: none; }
}