:root {
  --ink: #1c2033;
  --muted: #6b7280;
  --brand: #5865f2;
  --brand-dark: #454fbf;
  --bg: #f6f7fb;
  --card: #ffffff;
  --warn-bg: #fff7e6;
  --warn-ink: #8a6116;
  --err-bg: #fdecec;
  --err-ink: #a12622;
  --border: #e6e8f0;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
}
.container { max-width: 920px; margin: 0 auto; padding: 0 20px; }
.hidden { display: none !important; }

.header { background: var(--card); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-weight: 700; font-size: 20px; color: var(--ink); text-decoration: none; display: flex; align-items: center; gap: 10px; }
.logo-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 10px;
  background: var(--brand); color: #fff; font-size: 18px; font-weight: 800;
}
.nav { display: flex; gap: 22px; }
.nav a { color: var(--muted); text-decoration: none; font-size: 14.5px; }
.nav a:hover { color: var(--ink); }

.hero { padding: 64px 0 32px; text-align: center; }
.hero h1 { font-size: 40px; line-height: 1.15; letter-spacing: -0.5px; margin: 18px 0 14px; }
.lead { color: var(--muted); font-size: 17px; max-width: 560px; margin: 0 auto 26px; }
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.status-banner {
  display: inline-flex; align-items: center; gap: 10px;
  background: var(--warn-bg); color: var(--warn-ink);
  border: 1px solid #f2dfa9; border-radius: 999px;
  padding: 8px 18px; font-size: 14px;
}
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: #d98a04; flex: none; animation: pulse 1.6s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .35; } }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 10px; border: 1px solid transparent;
  padding: 12px 22px; font-size: 15.5px; font-weight: 600;
  cursor: pointer; text-decoration: none; transition: background .15s, border-color .15s;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); }
.btn-primary:disabled { opacity: .6; cursor: default; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--border); }
.btn-ghost:hover { border-color: #c9cdda; }
.btn-lg { padding: 15px 30px; font-size: 17px; }
.btn-sm { padding: 8px 14px; font-size: 13.5px; }

.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 16px; padding: 32px; margin: 26px 0;
  box-shadow: 0 1px 2px rgba(28,32,51,.04);
}
.card h2 { font-size: 22px; margin-bottom: 8px; }
.muted { color: var(--muted); font-size: 15px; margin-bottom: 20px; }
code { background: #eef0f7; border-radius: 5px; padding: 2px 6px; font-size: 13.5px; }

.room-result { margin-top: 22px; text-align: center; }
.room-code-label { font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: .6px; }
.room-code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 38px; font-weight: 700; letter-spacing: 3px;
  color: var(--brand-dark); margin: 8px 0 14px;
}
.join-form { display: flex; gap: 12px; flex-wrap: wrap; }
.input {
  flex: 1; min-width: 200px;
  border: 1px solid var(--border); border-radius: 10px;
  padding: 12px 16px; font-size: 17px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  letter-spacing: 2px; text-transform: uppercase;
}
.input:focus { outline: 2px solid var(--brand); outline-offset: -1px; }

.alert { border-radius: 10px; padding: 13px 16px; font-size: 14.5px; margin-top: 16px; text-align: left; }
.alert-warn { background: var(--warn-bg); color: var(--warn-ink); border: 1px solid #f2dfa9; }
.alert-error { background: var(--err-bg); color: var(--err-ink); border: 1px solid #f3c4c1; }

.how-title { text-align: center; font-size: 24px; margin: 48px 0 24px; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 56px; }
.step { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 24px; }
.step h3 { font-size: 16.5px; margin: 12px 0 6px; }
.step p { color: var(--muted); font-size: 14.5px; }
.step-num {
  width: 30px; height: 30px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: #eef0fe; color: var(--brand-dark); font-weight: 700; font-size: 14px;
}

.footer { border-top: 1px solid var(--border); background: var(--card); padding: 22px 0; }
.footer-inner { display: flex; justify-content: space-between; color: var(--muted); font-size: 14px; flex-wrap: wrap; gap: 10px; }
.footer-links a { color: var(--muted); margin-left: 18px; text-decoration: none; }
.footer-links a:hover { color: var(--ink); }

@media (max-width: 720px) {
  .hero h1 { font-size: 28px; }
  .steps { grid-template-columns: 1fr; }
  .nav { display: none; }
}