:root {
  color-scheme: light dark;
  --bg: #f4f6f8;
  --surface: #ffffff;
  --surface-2: #edf2f7;
  --text: #14213d;
  --muted: #5a6a7a;
  --accent: #20958b;
  --accent-2: #f59e0b;
  --border: #d8dee6;
  --success: #23c011;
  --winner: #186d31;
  --danger: #c62828;
  --warning: #ff590c;
  --shadow: 0 8px 20px rgba(13, 26, 38, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1b2a;
    --surface: #1b263b;
    --surface-2: #24344e;
    --text: #f0f4f8;
    --muted: #afbed0;
    --accent: #1a97aa;
    --accent-2: #fbbf24;
    --border: #334a66;
    --success: #37d67a;
    --winner: #7ff0a2;
    --danger: #d12727;
    --warning: #ff3c00;
    --shadow: 0 10px 26px rgba(0, 0, 0, 0.35);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background:
    radial-gradient(circle at 15% -10%, color-mix(in srgb, var(--accent) 14%, transparent), transparent 40%),
    radial-gradient(circle at 85% 0%, color-mix(in srgb, var(--accent-2) 13%, transparent), transparent 38%),
    var(--bg);
  color: var(--text);
  line-height: 1.45;
}

a {
  color: var(--accent);
}

.app-shell {
  width: min(1080px, 100% - 1.2rem);
  margin: 0 auto;
  padding: 1rem 0.6rem 3rem;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(8px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--border);
}

.topbar-inner {
  width: min(1080px, 100% - 1.2rem);
  margin: 0 auto;
  padding: 0.75rem 0.6rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.user-badge {
  display: block;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--muted);
  border-radius: 999px;
  padding: 0.32rem 0.6rem;
  font-size: 0.82rem;
  white-space: nowrap;
}

.user-menu {
  position: relative;
}

.user-menu summary {
  appearance: none;
  list-style: none;
  cursor: pointer;
}

.user-menu summary::after {
  content: "⌄";
  margin-left: 0.35rem;
  color: var(--muted);
}

.user-menu[open] summary::after {
  content: "⌃";
}

.user-menu summary::-webkit-details-marker {
  display: none;
}

.user-menu-panel {
  position: fixed;
  top: 4.25rem;
  right: 0;
  margin-right: max(0.6rem, calc((100vw - 1080px) / 2 + 0.6rem));
  z-index: 30;
  display: grid;
  gap: 0.45rem;
  min-width: 150px;
  padding: 0.55rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.user-menu-panel .btn {
  width: 100%;
  text-align: center;
  text-decoration: none;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand small {
  display: block;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 500;
}

.btn,
button {
  border: 1px solid transparent;
  background: var(--accent);
  color: #fff;
  border-radius: 12px;
  padding: 0.6rem 0.9rem;
  font: inherit;
  min-height: 44px;
  cursor: pointer;
}

.btn-secondary {
  background: var(--surface-2);
  color: var(--text);
  border-color: var(--border);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.section-title {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}

.section-subtitle {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0.3rem 0 0;
}

@media (min-width: 760px) {
  .app-shell {
    padding-top: 1.2rem;
  }
}