:root {
  color-scheme: dark;
  --red: #f00000;
  --black: #000000;
  --ink: #101010;
  --panel: #1a1a1a;
  --panel-2: #242424;
  --white: #ffffff;
  --muted: #b7b7b7;
  --gray: #828282;
  --line: #3b3b3b;
  --success: #0f766e;
  --warning: #d69e2e;
  --danger: #ff4d4d;
  --radius: 8px;
  font-family: Inter, "Arial", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    repeating-linear-gradient(135deg, rgba(240, 0, 0, 0.08) 0 8px, transparent 8px 22px),
    linear-gradient(180deg, #050505 0%, #171717 60%, #0b0b0b 100%);
  color: var(--white);
}

body {
  min-width: 320px;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  min-height: 44px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: calc(10px + env(safe-area-inset-top)) 14px 10px;
  border-bottom: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.88);
  backdrop-filter: blur(12px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--white);
  text-decoration: none;
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 58px;
  height: 34px;
  border: 2px solid var(--red);
  font-weight: 900;
  letter-spacing: 0;
  transform: skew(-8deg);
}

.brand-copy {
  font-size: 0.82rem;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

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

.icon-text-button,
.primary-button,
.spin-button,
.zalo-button,
.tab {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--white);
  background: var(--panel-2);
  cursor: pointer;
}

.icon-text-button {
  padding: 0 12px;
}

.link-button {
  min-height: 0;
  padding: 0;
  border: 0;
  color: var(--white);
  background: transparent;
  font-weight: 800;
  text-align: left;
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
}

.ghost {
  background: transparent;
}

.primary-button,
.zalo-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 0 16px;
  border-color: var(--red);
  background: var(--red);
  color: var(--white);
  font-weight: 800;
  text-decoration: none;
}

.primary-button:disabled,
.spin-button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

main {
  width: min(1180px, 100%);
  margin: 0 auto;
  padding: 14px;
}

.hidden {
  display: none !important;
}

.player-shell {
  display: grid;
  gap: 14px;
}

.campaign-status {
  padding: 10px 12px;
  border-left: 4px solid var(--warning);
  background: rgba(214, 158, 46, 0.14);
  border-radius: var(--radius);
  color: #ffe7ad;
}

.campaign-status.ready {
  border-color: var(--success);
  background: rgba(15, 118, 110, 0.16);
  color: #c8fff8;
}

.campaign-status.blocked {
  border-color: var(--danger);
  background: rgba(255, 77, 77, 0.14);
  color: #ffd0d0;
}

.game-stage,
.entry-panel,
.prize-strip,
.admin-login,
.admin-dashboard,
.tab-panel,
.ops-form {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(26, 26, 26, 0.92);
}

.game-stage {
  display: grid;
  gap: 16px;
  padding: 18px;
  overflow: hidden;
}

.stage-copy h1,
.admin-login h1,
.admin-heading h1 {
  margin: 0;
  font-size: clamp(1.6rem, 8vw, 3rem);
  letter-spacing: 0;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--red);
  font-weight: 900;
  text-transform: uppercase;
}

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

.wheel-wrap {
  position: relative;
  width: min(100%, 420px);
  aspect-ratio: 1;
  margin: 0 auto;
  display: grid;
  place-items: center;
}

#wheelCanvas {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  filter: drop-shadow(0 16px 30px rgba(0, 0, 0, 0.5));
}

.wheel-pointer {
  position: absolute;
  top: -2px;
  left: 50%;
  width: 0;
  height: 0;
  transform: translateX(-50%);
  border-left: 18px solid transparent;
  border-right: 18px solid transparent;
  border-top: 34px solid var(--white);
  filter: drop-shadow(0 2px 0 var(--red));
}

.spin-button {
  position: absolute;
  width: 92px;
  height: 92px;
  border-radius: 50%;
  border: 4px solid var(--white);
  background: var(--red);
  font-weight: 900;
  letter-spacing: 0;
}

.entry-panel,
.prize-strip {
  padding: 16px;
}

.entry-panel h2,
.prize-strip h2,
.ops-form h2 {
  margin: 0 0 12px;
  font-size: 1.05rem;
}

form {
  display: grid;
  gap: 12px;
}

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 0.92rem;
}

input,
select,
textarea {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #090909;
  color: var(--white);
  padding: 10px 12px;
}

.field-error,
.form-message {
  color: #ffb3b3;
  min-height: 18px;
  margin: 0;
}

.check-row {
  display: flex;
  grid-template-columns: none;
  align-items: flex-start;
  gap: 10px;
}

.check-row input {
  width: 20px;
  min-width: 20px;
  min-height: 20px;
  margin-top: 2px;
}

.zalo-step {
  display: grid;
  gap: 10px;
  padding: 12px;
  border: 1px solid #315fa8;
  border-radius: var(--radius);
  background: rgba(29, 78, 216, 0.14);
}

.zalo-button {
  background: #0966d8;
  border-color: #6aa7ff;
}

.prize-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(128px, 1fr));
  gap: 10px;
}

.prize-item {
  display: grid;
  grid-template-columns: 44px 1fr;
  align-items: center;
  gap: 10px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #101010;
}

.prize-item img {
  width: 44px;
  height: 44px;
}

.prize-item strong,
.prize-item span {
  display: block;
  min-width: 0;
}

.admin-shell {
  display: grid;
  gap: 14px;
}

.admin-login,
.admin-dashboard {
  padding: 16px;
}

.admin-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 12px;
}

.tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
}

.tab {
  padding: 0 14px;
}

.tab.active {
  border-color: var(--red);
  background: var(--red);
}

.tab-panel {
  display: none;
  padding: 14px;
}

.tab-panel.active {
  display: block;
}

.split-panel {
  display: grid;
  gap: 14px;
}

.ops-form {
  padding: 14px;
}

.ops-form.compact {
  max-width: 420px;
}

.table-wrap {
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 620px;
}

th,
td {
  padding: 10px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--muted);
  font-size: 0.78rem;
  text-transform: uppercase;
}

.low-stock {
  color: #ffe7ad;
}

.toolbar,
.metrics {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.metric {
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #101010;
}

.csv-output {
  min-height: 120px;
  margin-top: 10px;
}

.result-dialog {
  width: min(92vw, 420px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #111;
  color: var(--white);
}

.result-dialog::backdrop {
  background: rgba(0, 0, 0, 0.72);
}

.claim-code {
  display: block;
  margin: 12px 0;
  padding: 14px;
  border: 2px dashed var(--warning);
  border-radius: var(--radius);
  color: var(--warning);
  font-size: 1.6rem;
  font-weight: 900;
  text-align: center;
}

@media (min-width: 860px) {
  main {
    padding: 22px;
  }

  .player-shell {
    grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
    align-items: start;
  }

  .campaign-status,
  .prize-strip {
    grid-column: 1 / -1;
  }

  .game-stage {
    min-height: 620px;
  }

  .split-panel {
    grid-template-columns: minmax(320px, 0.42fr) minmax(0, 1fr);
  }
}