:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #23263a;
  --border: #2e3250;
  --accent: #4f7cff;
  --accent-hover: #6b93ff;
  --danger: #e05252;
  --danger-hover: #f06060;
  --success: #3ecf6e;
  --warning: #f5a623;
  --text: #e8eaf0;
  --text-muted: #8b90a8;
  --radius: 8px;
  --shadow: 0 2px 12px rgba(0,0,0,0.4);
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
  min-height: 100vh;
  min-width: 1000px;
  overflow-x: auto;
}

/* HEADER */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 32px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left { display: flex; align-items: center; gap: 12px; }
.header-left h1 { font-size: 18px; font-weight: 700; letter-spacing: -0.3px; }
.header-right { display: flex; gap: 8px; }

/* BADGES */
.badge {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
  letter-spacing: 0.3px;
}
.badge-checking { background: var(--surface2); color: var(--text-muted); }
.badge-ok { background: rgba(62,207,110,0.15); color: var(--success); border: 1px solid rgba(62,207,110,0.3); }
.badge-error { background: rgba(224,82,82,0.15); color: var(--danger); border: 1px solid rgba(224,82,82,0.3); }

/* TABS */
.tab-nav {
  display: flex;
  gap: 4px;
  padding: 12px 32px 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.tab-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius) var(--radius) 0 0;
  transition: color 0.15s, background 0.15s;
}
.tab-btn:hover { color: var(--text); background: var(--surface2); }
.tab-btn.active { color: var(--accent); border-bottom: 2px solid var(--accent); background: var(--surface2); }

/* CONTENT */
.tab-content { display: none; padding: 24px 32px; }
.tab-content.active { display: block; }

/* PANEL */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.panel-header h2 { font-size: 16px; font-weight: 600; }

.hint {
  color: var(--text-muted);
  margin-bottom: 20px;
  font-size: 13px;
}

/* BUTTONS */
.btn {
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 16px;
  transition: background 0.15s, transform 0.1s;
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: var(--danger-hover); }
.btn-ghost { background: var(--surface2); color: var(--text); border: 1px solid var(--border); }
.btn-ghost:hover { background: var(--border); }
.btn-sm { padding: 5px 12px; font-size: 12px; }
.btn-icon { background: none; border: none; cursor: pointer; color: var(--text-muted); font-size: 15px; padding: 4px 6px; border-radius: 4px; }
.btn-icon:hover { color: var(--text); background: var(--surface2); }

/* FORM */
.form-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
}
.form-card h3 { margin-bottom: 14px; font-size: 14px; font-weight: 600; }

.form-row {
  display: flex;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

label {
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
  flex: 1;
  min-width: 140px;
}

input, select {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 13px;
  padding: 7px 10px;
  outline: none;
  transition: border-color 0.15s;
  width: 100%;
}
input:focus, select:focus { border-color: var(--accent); }
select option { background: var(--surface2); }

.form-actions { display: flex; gap: 8px; margin-top: 14px; }

/* TABLES */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

th {
  text-align: left;
  padding: 10px 12px;
  background: var(--surface2);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border);
}

td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--surface2); }

.empty {
  text-align: center;
  color: var(--text-muted);
  padding: 32px;
}

.status-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 20px;
  text-transform: capitalize;
}
.status-pending { background: rgba(245,166,35,0.15); color: var(--warning); }
.status-shipped { background: rgba(79,124,255,0.15); color: var(--accent); }
.status-delivered { background: rgba(62,207,110,0.15); color: var(--success); }

/* TOAST */
.toast {
  padding: 10px 14px;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 14px;
}
.toast.success { background: rgba(62,207,110,0.15); color: var(--success); border: 1px solid rgba(62,207,110,0.3); }
.toast.error { background: rgba(224,82,82,0.15); color: var(--danger); border: 1px solid rgba(224,82,82,0.3); }
.hidden { display: none !important; }

/* DEMO */
.demo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.demo-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.demo-card h3 { font-size: 14px; font-weight: 700; }
.demo-card p { color: var(--text-muted); font-size: 13px; }
.demo-card code { background: var(--surface); padding: 1px 5px; border-radius: 4px; font-size: 12px; font-family: 'Fira Code', monospace; color: var(--accent); }

.result-box {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px;
  font-size: 12px;
  font-family: 'Fira Code', monospace;
  white-space: pre-wrap;
  overflow-x: auto;
  color: var(--text);
  max-height: 320px;
  overflow-y: auto;
}

.result-meta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}
.result-meta span { font-size: 12px; }
.meta-label { color: var(--text-muted); }
.meta-value { color: var(--success); font-weight: 700; }
.meta-value.warn { color: var(--warning); }

/* WORKBENCH */
.workbench-steps {
  margin: 16px 0 24px 20px;
  line-height: 2;
}
.workbench-steps li { color: var(--text-muted); }
.workbench-steps strong { color: var(--text); }

.config-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 16px;
}
.config-card h3 { font-size: 13px; font-weight: 600; margin-bottom: 10px; }
.config-card pre {
  background: var(--bg);
  border-radius: 6px;
  padding: 12px;
  font-size: 12px;
  overflow-x: auto;
  color: #a8c4ff;
}

.info-table { font-size: 13px; }
.info-table th, .info-table td { padding: 8px 12px; }

/* COST BOX */
.cost-box {
  background: rgba(245,166,35,0.07);
  border: 1px solid rgba(245,166,35,0.3);
  border-radius: 6px;
  padding: 10px 14px;
  margin-bottom: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.cost-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 11px;
  font-family: 'Fira Code', monospace;
}
.cost-label  { color: var(--text-muted); }
.cost-bad    { color: var(--warning); font-weight: 700; }
.cost-good   { color: var(--success); font-weight: 700; }
.cost-waste  { color: var(--danger); font-weight: 700; margin-left: auto; }
.cost-arrow  { color: var(--text-muted); }
.cost-save   { color: var(--success); font-weight: 700; margin-left: auto; }

/* ADVANCED */
.advanced-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(360px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.advanced-result-card {
  grid-column: 1 / -1;
}

.advanced-summary {
  color: var(--text-muted);
  font-size: 13px;
  margin-bottom: 10px;
}

.advanced-summary.ok { color: var(--success); }
.advanced-summary.fail { color: var(--danger); }

.advanced-state {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 16px;
}

.advanced-table-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.advanced-table-card h3 {
  font-size: 13px;
  font-weight: 700;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}

.advanced-table-card table {
  font-size: 12px;
}

.cache-line {
  color: var(--text-muted);
  font-size: 12px;
  padding: 10px 14px;
  border-top: 1px solid var(--border);
}

@media (max-width: 1200px) {
  .advanced-grid,
  .advanced-state {
    grid-template-columns: 1fr;
  }
}