:root {
  color-scheme: light;
  --bg: #f7f8fa;
  --panel: #ffffff;
  --text: #18212f;
  --muted: #647084;
  --line: #d9dee8;
  --accent: #116d6e;
  --accent-strong: #0b5152;
  --danger: #b42318;
  --danger-bg: #fff1f0;
  --ok-bg: #e9f7ef;
  --warn-bg: #fff7d6;
  --shadow: 0 10px 28px rgba(19, 31, 51, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.4;
}

button,
input {
  font: inherit;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px clamp(16px, 4vw, 40px);
  background: rgba(247, 248, 250, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 26px;
  font-weight: 760;
}

h2 {
  font-size: 17px;
  font-weight: 720;
}

.eyebrow {
  color: var(--accent);
  font-size: 12px;
  font-weight: 780;
  text-transform: uppercase;
}

.layout {
  display: grid;
  grid-template-columns: minmax(280px, 360px) 1fr;
  gap: 18px;
  padding: 22px clamp(16px, 4vw, 40px) 40px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 18px;
}

.settings-panel {
  align-self: start;
}

.create-panel,
.tournaments-panel,
.leaderboard-panel {
  grid-column: 2;
}

.create-panel {
  grid-row: 1 / span 2;
}

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
}

input {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 9px 10px;
  color: var(--text);
  background: #fff;
  outline: none;
}

input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(17, 109, 110, 0.12);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 14px;
}

.wide {
  grid-column: 1 / -1;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

button {
  min-height: 38px;
  border: 1px solid var(--accent);
  border-radius: 6px;
  padding: 8px 12px;
  color: #fff;
  background: var(--accent);
  cursor: pointer;
  font-weight: 700;
}

button:hover {
  background: var(--accent-strong);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.58;
}

button.ghost {
  color: var(--text);
  border-color: var(--line);
  background: #fff;
}

button.ghost:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
}

button.danger {
  color: var(--danger);
  border-color: #f2b8b5;
  background: var(--danger-bg);
}

button.danger:hover {
  border-color: var(--danger);
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.muted {
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
}

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

table {
  width: 100%;
  min-width: 880px;
  border-collapse: collapse;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 10px 9px;
  text-align: left;
  vertical-align: middle;
  font-size: 13px;
  white-space: nowrap;
}

th {
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

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

.state {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  border-radius: 999px;
  padding: 3px 8px;
  font-weight: 760;
}

.state.current,
.state.submitted {
  background: var(--ok-bg);
  color: #17623a;
}

.state.upcoming,
.state.in_progress {
  background: var(--warn-bg);
  color: #7a5600;
}

.state.ended,
.state.entered {
  background: #eef2f7;
  color: #4b5565;
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  max-width: min(420px, calc(100vw - 36px));
  border-radius: 8px;
  padding: 12px 14px;
  color: #fff;
  background: #1f2937;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 160ms ease, transform 160ms ease;
  pointer-events: none;
}

.toast.visible {
  opacity: 1;
  transform: translateY(0);
}

.toast.error {
  background: var(--danger);
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .settings-panel,
  .create-panel,
  .tournaments-panel,
  .leaderboard-panel {
    grid-column: 1;
    grid-row: auto;
  }
}

@media (max-width: 640px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }
}