:root {
  --bg: #f4f5f9;
  --bg-grad: radial-gradient(1200px 600px at 10% -10%, #e4e9ff 0%, transparent 60%),
             radial-gradient(900px 500px at 110% 10%, #ffe9f1 0%, transparent 55%);
  --surface: #ffffff;
  --surface-2: #f7f8fb;
  --border: #e6e8ef;
  --text: #171a23;
  --text-dim: #5d6476;
  --text-faint: #9aa0b0;
  --accent: #4f6bff;
  --accent-soft: #eef1ff;
  --danger: #e5484d;
  --ok: #2fa66a;
  --warn: #e6a23c;
  --shadow: 0 1px 2px rgba(20, 24, 40, .04), 0 8px 24px rgba(20, 24, 40, .06);
  --shadow-lg: 0 20px 60px rgba(20, 24, 40, .18);
  --radius: 16px;
  --font: "IBM Plex Sans Thai", system-ui, -apple-system, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1016;
    --bg-grad: radial-gradient(1200px 600px at 10% -10%, #1a2045 0%, transparent 60%),
               radial-gradient(900px 500px at 110% 10%, #2a1528 0%, transparent 55%);
    --surface: #171a23;
    --surface-2: #1d212c;
    --border: #2a2f3d;
    --text: #eceef4;
    --text-dim: #a2a9ba;
    --text-faint: #697085;
    --accent: #7b8fff;
    --accent-soft: #232a4d;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, .5);
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  min-height: 100vh;
  background: var(--bg-grad), var(--bg);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
button, input { font: inherit; color: inherit; }
button { cursor: pointer; }
svg { display: block; }

/* ---------- top bar ---------- */

.topbar {
  position: sticky; top: 0; z-index: 30;
  backdrop-filter: blur(14px) saturate(1.4);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  background: color-mix(in srgb, var(--bg) 75%, transparent);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; align-items: center; gap: 14px;
  padding: 12px 20px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; letter-spacing: -.01em; }
.brand-mark {
  width: 36px; height: 36px; border-radius: 11px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, #4f6bff, #b14fff);
  color: #fff; box-shadow: 0 6px 16px rgba(79, 107, 255, .35);
}
.brand small { display: block; font-size: 12px; font-weight: 400; color: var(--text-dim); margin-top: -2px; }
.spacer { flex: 1; }

.btn {
  display: inline-flex; align-items: center; gap: 7px;
  height: 38px; padding: 0 14px;
  border-radius: 11px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text);
  font-weight: 500; font-size: 14px; white-space: nowrap;
  transition: transform .08s, background .15s, border-color .15s;
}
.btn:hover { border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.btn:active { transform: scale(.97); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; box-shadow: 0 6px 16px color-mix(in srgb, var(--accent) 35%, transparent); }
.btn.primary:hover { filter: brightness(1.06); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--text-dim); }
.btn.ghost:hover { background: var(--surface-2); color: var(--text); }
.btn.danger { color: var(--danger); }
.btn.icon { width: 38px; padding: 0; justify-content: center; }

/* ---------- layout ---------- */

main {
  max-width: 1280px; margin: 0 auto;
  padding: 22px 20px 80px;
  display: grid; grid-template-columns: 300px 1fr; gap: 22px;
  align-items: start;
}
@media (max-width: 860px) {
  main { grid-template-columns: 1fr; padding: 16px 16px 80px; }
  .topbar-inner { padding: 10px 16px; gap: 8px; }
  .brand small { display: none; }
  .hide-sm { display: none !important; }
}

.stats {
  grid-column: 1 / -1;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px;
}
@media (max-width: 860px) { .stats { grid-template-columns: repeat(2, 1fr); } }
.stat {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 16px; box-shadow: var(--shadow);
}
.stat .label { font-size: 13px; color: var(--text-dim); }
.stat .value { font-size: 26px; font-weight: 700; letter-spacing: -.02em; font-variant-numeric: tabular-nums; }
.stat .value small { font-size: 14px; font-weight: 500; color: var(--text-faint); }
.stat.hl .value { color: var(--accent); }

/* ---------- people panel ---------- */

.panel {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  position: sticky; top: 84px;
}
@media (max-width: 860px) { .panel { position: static; } }
.panel-head { padding: 16px 16px 10px; display: flex; align-items: center; justify-content: space-between; }
.panel-head h2 { margin: 0; font-size: 15px; font-weight: 600; }
.count-pill {
  font-size: 12px; font-weight: 600; padding: 2px 9px; border-radius: 99px;
  background: var(--accent-soft); color: var(--accent);
}
.add-row { display: flex; gap: 8px; padding: 0 16px 12px; }
.input {
  flex: 1; min-width: 0; height: 40px; padding: 0 12px;
  border-radius: 11px; border: 1px solid var(--border);
  background: var(--surface-2); outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.input:focus { border-color: var(--accent); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 18%, transparent); }
.search { padding: 0 16px 10px; }
.search .input { width: 100%; height: 36px; font-size: 14px; }

.pool {
  min-height: 120px; max-height: calc(100vh - 330px); overflow-y: auto;
  padding: 6px 12px 14px; display: flex; flex-wrap: wrap; align-content: flex-start; gap: 8px;
  border-top: 1px dashed var(--border);
  transition: background .15s;
}
@media (max-width: 860px) { .pool { max-height: none; } }
.pool.drop-over { background: var(--accent-soft); }
.pool-empty { width: 100%; text-align: center; color: var(--text-faint); font-size: 13px; padding: 24px 8px; }

/* ---------- person chip ---------- */

.chip {
  display: inline-flex; align-items: center; gap: 8px;
  height: 36px; padding: 0 12px 0 4px;
  border-radius: 99px; border: 1px solid var(--border);
  background: var(--surface); font-size: 14px;
  cursor: grab; user-select: none;
  transition: transform .12s, box-shadow .12s, border-color .12s;
  max-width: 100%;
}
.chip:hover { border-color: color-mix(in srgb, var(--accent) 45%, var(--border)); box-shadow: var(--shadow); }
.chip.dragging { opacity: .4; }
.chip .name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.avatar {
  width: 28px; height: 28px; border-radius: 50%; flex: none;
  display: grid; place-items: center;
  font-size: 13px; font-weight: 600; color: #fff;
}

/* ---------- cars ---------- */

.cars-head { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.cars-head h2 { margin: 0; font-size: 17px; font-weight: 650; }
.cars {
  display: grid; gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
}

.car {
  position: relative; overflow: hidden;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  display: flex; flex-direction: column;
  transition: transform .15s, box-shadow .15s, border-color .15s;
  animation: pop .25s ease-out;
}
.car.drop-over { border-color: var(--car); box-shadow: 0 0 0 4px color-mix(in srgb, var(--car) 25%, transparent), var(--shadow); transform: translateY(-2px); }
.car.full .car-meter-fill { background: var(--warn); }
.car-top {
  padding: 16px 16px 12px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--car) 16%, transparent), transparent 70%);
  display: flex; gap: 12px; align-items: center;
}
.car-icon {
  width: 46px; height: 46px; border-radius: 13px; flex: none;
  display: grid; place-items: center; color: #fff;
  background: var(--car);
  box-shadow: 0 8px 18px color-mix(in srgb, var(--car) 40%, transparent);
}
.car-title { flex: 1; min-width: 0; }
.car-title h3 { margin: 0; font-size: 16px; font-weight: 650; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.plate {
  display: inline-block; margin-top: 3px;
  font-size: 12px; font-weight: 600; letter-spacing: .02em;
  padding: 1px 8px; border-radius: 6px;
  border: 1px solid var(--border); background: var(--surface-2); color: var(--text-dim);
}
.car-meter { padding: 0 16px; }
.car-meter-row { display: flex; justify-content: space-between; font-size: 12.5px; color: var(--text-dim); margin-bottom: 6px; }
.car-meter-row b { color: var(--text); font-variant-numeric: tabular-nums; }
.car-meter-bar { height: 6px; border-radius: 99px; background: var(--surface-2); overflow: hidden; }
.car-meter-fill { height: 100%; border-radius: 99px; background: var(--car); transition: width .3s ease; }

.riders { list-style: none; margin: 0; padding: 12px 10px 6px; flex: 1; min-height: 70px; }
.rider {
  display: flex; align-items: center; gap: 10px;
  padding: 6px 8px; border-radius: 11px; cursor: grab;
  transition: background .12s;
}
.rider:hover { background: var(--surface-2); }
.rider.dragging { opacity: .4; }
.rider .name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.driver-tag {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 11.5px; font-weight: 600; padding: 2px 8px; border-radius: 99px;
  background: color-mix(in srgb, var(--car) 15%, transparent); color: var(--car);
}
.riders-empty { color: var(--text-faint); font-size: 13px; text-align: center; padding: 18px 8px; border: 1.5px dashed var(--border); border-radius: 12px; margin: 0 6px; }
.car-foot { display: flex; gap: 6px; padding: 8px 12px 12px; }
.car-foot .btn { height: 34px; font-size: 13px; }
.car-foot .add-rider { flex: 1; justify-content: center; border-style: dashed; color: var(--text-dim); }
.car-foot .add-rider:hover { color: var(--car); border-color: var(--car); }

.empty-cars {
  grid-column: 1 / -1;
  text-align: center; padding: 56px 20px;
  border: 2px dashed var(--border); border-radius: var(--radius);
  color: var(--text-dim);
}
.empty-cars .big { width: 64px; height: 64px; margin: 0 auto 10px; color: var(--text-faint); }

@keyframes pop { from { opacity: 0; transform: translateY(6px) scale(.98); } to { opacity: 1; transform: none; } }

/* ---------- popover menu ---------- */

.menu {
  position: fixed; z-index: 60; min-width: 210px; max-width: 280px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 14px; box-shadow: var(--shadow-lg);
  padding: 6px; animation: pop .14s ease-out;
}
.menu-title { font-size: 12px; color: var(--text-faint); padding: 6px 10px 4px; }
.menu button {
  width: 100%; display: flex; align-items: center; gap: 10px;
  padding: 9px 10px; border: 0; border-radius: 9px; background: none;
  text-align: left; font-size: 14px;
}
.menu button:hover { background: var(--surface-2); }
.menu button.danger { color: var(--danger); }
.menu button:disabled { opacity: .45; cursor: not-allowed; }
.menu hr { border: 0; border-top: 1px solid var(--border); margin: 5px 4px; }
.menu .scroll { max-height: 280px; overflow-y: auto; }
.menu .dot { width: 10px; height: 10px; border-radius: 50%; flex: none; }
.menu .meta { margin-left: auto; font-size: 12px; color: var(--text-faint); }

/* ---------- modal ---------- */

.backdrop {
  position: fixed; inset: 0; z-index: 70;
  background: rgba(10, 12, 20, .45); backdrop-filter: blur(3px);
  display: grid; place-items: center; padding: 16px;
  animation: fade .15s ease-out;
}
@keyframes fade { from { opacity: 0; } }
.modal {
  width: 100%; max-width: 420px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 20px; box-shadow: var(--shadow-lg);
  padding: 22px; animation: pop .2s ease-out;
}
.modal h3 { margin: 0 0 16px; font-size: 18px; }
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; color: var(--text-dim); margin-bottom: 6px; }
.field .input { width: 100%; }
.stepper { display: flex; align-items: center; gap: 10px; }
.stepper .val { min-width: 40px; text-align: center; font-size: 20px; font-weight: 700; font-variant-numeric: tabular-nums; }
.swatches { display: flex; flex-wrap: wrap; gap: 8px; }
.swatch {
  width: 32px; height: 32px; border-radius: 50%; border: 0;
  box-shadow: inset 0 0 0 2px rgba(255,255,255,.35);
  transition: transform .1s;
}
.swatch:hover { transform: scale(1.1); }
.swatch.on { box-shadow: 0 0 0 3px var(--surface), 0 0 0 5px currentColor; }
.modal-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 20px; }

/* ---------- toast ---------- */

.toasts { position: fixed; left: 50%; bottom: 22px; transform: translateX(-50%); z-index: 80; display: grid; gap: 8px; }
.toast {
  padding: 10px 16px; border-radius: 12px; font-size: 14px;
  background: var(--text); color: var(--bg); box-shadow: var(--shadow-lg);
  animation: pop .2s ease-out;
}
.toast.err { background: var(--danger); color: #fff; }

/* ---------- login ---------- */

.login-wrap { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login-card {
  width: 100%; max-width: 360px; text-align: center;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 22px; box-shadow: var(--shadow-lg); padding: 32px 26px;
}
.login-card .brand-mark { width: 56px; height: 56px; border-radius: 17px; margin: 0 auto 14px; }
.login-card h1 { margin: 0; font-size: 22px; }
.login-card p { margin: 4px 0 22px; color: var(--text-dim); font-size: 14px; }
.login-card .input { width: 100%; height: 46px; text-align: center; margin-bottom: 12px; }
.login-card .btn { width: 100%; height: 46px; justify-content: center; font-size: 15px; }
.login-err { color: var(--danger); font-size: 13px; margin-bottom: 10px; }