/* Mini Hello — token system theo brand Krao (BRAND.md): vàng #FFBF00 trên navy #0D1733 */
:root {
  --color-bg: #0d1733;
  --color-bg-raise: #16234a;
  --color-border: #2a3a66;
  --color-text: #f4f6fb;
  --color-text-dim: #aab4d0;
  --color-accent: #ffbf00;
  --color-accent-ink: #0d1733; /* chữ trên nền vàng */
  --color-ok: #4ade80;
  --color-err: #f87171;
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-pill: 999px;
  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.35);
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 40px;
  --font-ui: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

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

html, body { height: 100%; }

body {
  font-family: var(--font-ui);
  background:
    radial-gradient(ellipse 90% 60% at 50% -10%, rgba(255, 191, 0, 0.12), transparent 60%),
    var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.shell {
  min-height: 100%;
  max-width: 560px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

/* ---- Hero ---- */
.hero { text-align: center; padding-top: var(--space-3); }

.logo {
  width: 72px;
  height: 72px;
  margin-bottom: var(--space-2);
  filter: drop-shadow(0 0 18px rgba(255, 191, 0, 0.35));
}

.hero-kicker {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--color-accent);
}

.hero-title {
  font-size: clamp(1.6rem, 5vw, 2.2rem);
  font-weight: 800;
  margin-top: var(--space-1);
}

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

.hero-sub {
  color: var(--color-text-dim);
  font-size: 0.95rem;
  margin-top: var(--space-1);
}

/* ---- Card trạng thái ---- */
.card {
  background: var(--color-bg-raise);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: var(--space-4);
}

.state { display: flex; flex-direction: column; align-items: center; gap: var(--space-2); text-align: center; }
.state[hidden] { display: none; }

.state-title { font-weight: 700; font-size: 1.05rem; }
.state-sub { color: var(--color-text-dim); font-size: 0.9rem; max-width: 40ch; }

code {
  background: rgba(255, 191, 0, 0.12);
  color: var(--color-accent);
  border-radius: 6px;
  padding: 1px 6px;
  font-size: 0.85em;
}

/* Badge */
.badge {
  display: inline-block;
  border-radius: var(--radius-pill);
  padding: 2px 12px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.badge-ok { background: rgba(74, 222, 128, 0.14); color: var(--color-ok); border: 1px solid rgba(74, 222, 128, 0.4); }
.badge-err { background: rgba(248, 113, 113, 0.14); color: var(--color-err); border: 1px solid rgba(248, 113, 113, 0.4); }
.badge-muted { background: rgba(170, 180, 208, 0.12); color: var(--color-text-dim); border: 1px solid var(--color-border); }

/* Bảng thông tin phòng/người xem */
.info {
  width: 100%;
  margin-top: var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.info-row {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
}
.info-row + .info-row { border-top: 1px solid var(--color-border); }
.info-row dt { color: var(--color-text-dim); font-size: 0.85rem; }
.info-row dd { font-weight: 600; word-break: break-all; text-align: right; }

/* Nút */
.btn {
  margin-top: var(--space-2);
  background: var(--color-accent);
  color: var(--color-accent-ink);
  border: none;
  border-radius: var(--radius-md);
  padding: 10px 24px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { box-shadow: 0 4px 16px rgba(255, 191, 0, 0.35); transform: translateY(-1px); }
.btn:focus-visible,
a:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* Spinner */
.spinner {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Footer */
.foot {
  margin-top: auto;
  text-align: center;
  color: var(--color-text-dim);
  font-size: 0.75rem;
}

/* A11y: tôn trọng người dùng giảm chuyển động */
@media (prefers-reduced-motion: reduce) {
  .spinner { animation: none; border-top-color: var(--color-border); }
  .btn { transition: none; }
  .btn:hover { transform: none; }
}

/* Panel widget hẹp (Element side panel ~320-420px) */
@media (max-width: 420px) {
  .shell { padding: var(--space-3) var(--space-2); gap: var(--space-3); }
  .logo { width: 56px; height: 56px; }
  .card { padding: var(--space-3); }
  .info-row { flex-direction: column; gap: 0; }
  .info-row dd { text-align: left; }
}