/* ── reset ──────────────────────────────────────────── */

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--fg);
  background: var(--bg);
  min-height: 100dvh;
}

/* ── light theme (public) ──────────────────────────── */

:root {
  --bg: #fff;
  --fg: #171717;
  --muted: #737373;
  --border: #e5e5e5;
  --border-strong: #d4d4d4;
  --accent: #171717;
  --accent-fg: #fff;
  --surface: #fafafa;
  --surface-2: #f5f5f5;
  --radius: 6px;
  --radius-lg: 8px;
  --mono: "SF Mono", "Cascadia Code", "Consolas", "Liberation Mono", monospace;
  --green: #16a34a;
  --amber: #d97706;
  --red: #dc2626;
  --blue: #2563eb;
}

/* ── dark theme (ops) ──────────────────────────────── */

.dark {
  --bg: #0a0a0a;
  --fg: #ededed;
  --muted: #a1a1a1;
  --border: #262626;
  --border-strong: #404040;
  --accent: #ededed;
  --accent-fg: #0a0a0a;
  --surface: #141414;
  --surface-2: #1a1a1a;
  --green: #22c55e;
  --amber: #f59e0b;
  --red: #ef4444;
  --blue: #3b82f6;
}

/* ── typography ────────────────────────────────────── */

h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h1 { font-size: 1.5rem; }
h2 { font-size: 1.125rem; }
h3 { font-size: 1rem; }

code, kbd, .mono {
  font-family: var(--mono);
  font-size: 0.85em;
}

a {
  color: inherit;
  text-decoration: none;
}

p { margin: 0; }

small, .text-sm {
  font-size: 0.8125rem;
}

.text-xs {
  font-size: 0.75rem;
}

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

.label {
  display: block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

/* ── layout ────────────────────────────────────────── */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

.container-sm {
  max-width: 720px;
}

.stack {
  display: grid;
  gap: 16px;
}

.stack-sm {
  display: grid;
  gap: 8px;
}

.stack-lg {
  display: grid;
  gap: 24px;
}

.row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.row-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.row-wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

/* ── card / surface ────────────────────────────────── */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
}

.panel {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}

/* ── buttons ───────────────────────────────────────── */

button, .btn {
  cursor: pointer;
  border: none;
  background: none;
  font: inherit;
  color: inherit;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 36px;
  padding: 0 14px;
  font-size: 0.8125rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: background 0.15s, color 0.15s, border-color 0.15s, opacity 0.15s;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.4;
  pointer-events: none;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-fg);
}
.btn-primary:hover {
  opacity: 0.85;
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--fg);
}
.btn-secondary:hover {
  border-color: var(--border-strong);
  background: var(--surface);
}

.btn-ghost {
  background: transparent;
  color: var(--muted);
}
.btn-ghost:hover {
  color: var(--fg);
}

.btn-danger {
  background: transparent;
  border: 1px solid var(--red);
  color: var(--red);
}
.btn-danger:hover {
  background: var(--red);
  color: #fff;
}

.btn-sm {
  height: 28px;
  padding: 0 10px;
  font-size: 0.75rem;
}

.btn-xs {
  height: 24px;
  padding: 0 8px;
  font-size: 0.6875rem;
}

/* ── forms ─────────────────────────────────────────── */

input, select, textarea {
  font: inherit;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 12px;
  height: 36px;
  width: 100%;
  transition: border-color 0.15s;
}

textarea {
  height: auto;
  min-height: 80px;
  resize: vertical;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

input::placeholder, textarea::placeholder {
  color: var(--muted);
}

select {
  cursor: pointer;
}

.field {
  display: grid;
  gap: 4px;
}

.field > label, .field > span {
  font-size: 0.8125rem;
  color: var(--muted);
}

.field-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.checkbox-row input[type="checkbox"] {
  width: 16px;
  height: 16px;
  min-height: unset;
}

/* ── badge ─────────────────────────────────────────── */

.badge {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 8px;
  font-size: 0.6875rem;
  font-weight: 600;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge-info {
  background: rgba(37, 99, 235, 0.1);
  color: var(--blue);
}

.badge-success {
  background: rgba(22, 163, 74, 0.1);
  color: var(--green);
}

.badge-warning {
  background: rgba(217, 119, 6, 0.1);
  color: var(--amber);
}

.badge-error {
  background: rgba(220, 38, 38, 0.1);
  color: var(--red);
}

/* ── table ─────────────────────────────────────────── */

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
}

thead th {
  text-align: left;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

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

tbody tr:last-child td {
  border-bottom: none;
}

tbody tr:hover {
  background: var(--surface);
}

/* ── modal ─────────────────────────────────────────── */

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: rgba(0, 0, 0, 0.5);
  display: grid;
  place-items: center;
}

.modal-backdrop.hidden {
  display: none;
}

.modal {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  width: min(480px, calc(100vw - 32px));
  display: grid;
  gap: 16px;
}

/* ── feedback / toast ──────────────────────────────── */

.toast {
  position: fixed;
  bottom: 16px;
  right: 16px;
  max-width: 360px;
  padding: 10px 16px;
  border-radius: var(--radius);
  font-size: 0.8125rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  z-index: 100;
  transition: opacity 0.2s, transform 0.2s;
}

.toast.hidden {
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
}

.toast-error {
  border-color: var(--red);
  color: var(--red);
}

.toast-success {
  border-color: var(--green);
  color: var(--green);
}

/* ── status strip ──────────────────────────────────── */

.status-strip {
  padding: 10px 16px;
  border-radius: var(--radius);
  font-size: 0.8125rem;
  border: 1px solid var(--border);
  background: var(--surface);
}

.status-strip.hidden { display: none; }

.status-strip[data-tone="error"] {
  border-color: var(--red);
  background: rgba(220, 38, 38, 0.06);
  color: var(--red);
}

.status-strip[data-tone="warning"] {
  border-color: var(--amber);
  background: rgba(217, 119, 6, 0.06);
  color: var(--amber);
}

.status-strip[data-tone="info"] {
  border-color: var(--blue);
  background: rgba(37, 99, 235, 0.06);
  color: var(--blue);
}

.status-strip[data-tone="success"] {
  border-color: var(--green);
  background: rgba(22, 163, 74, 0.06);
  color: var(--green);
}

/* ── stat card ─────────────────────────────────────── */

.stat {
  display: grid;
  gap: 2px;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  font-family: var(--mono);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ── meter ─────────────────────────────────────────── */

.meter {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  align-items: center;
}

.meter-track {
  height: 6px;
  border-radius: 3px;
  background: var(--surface-2);
  overflow: hidden;
}

.meter-fill {
  height: 100%;
  border-radius: 3px;
  background: var(--accent);
}

.meter-text {
  font-size: 0.75rem;
  font-family: var(--mono);
  color: var(--muted);
}

/* ── empty state ───────────────────────────────────── */

.empty {
  padding: 32px 16px;
  text-align: center;
  color: var(--muted);
  font-size: 0.8125rem;
}

/* ── utility ───────────────────────────────────────── */

.hidden { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.break-all { word-break: break-all; }
.w-full { width: 100%; }
.border-b { border-bottom: 1px solid var(--border); }

/* ── responsive ────────────────────────────────────── */

@media (max-width: 1200px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .field-row { grid-template-columns: 1fr; }
  .container { padding: 0 12px; }
  .row-between { flex-wrap: wrap; }
}