:root {
  --bg: #0f1220;
  --panel: #171a2b;
  --accent: #7c5cff;
  --accent-2: #23d5d5;
  --text: #eef0fa;
  --muted: #9aa0c3;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background: var(--panel);
}

.brand {
  font-weight: 700;
  font-size: 1.4rem;
  color: var(--text);
  text-decoration: none;
}

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

.navbar nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 1.5rem;
}

.navbar nav a:hover { color: var(--text); }

.btn-primary, .btn-outline {
  display: inline-block;
  padding: 0.6rem 1.4rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
}

.btn-outline {
  border: 1px solid var(--accent);
  color: var(--text) !important;
}

main {
  max-width: 1000px;
  margin: 0 auto;
  padding: 2rem;
}

.hero {
  text-align: center;
  padding: 3rem 1rem;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 0.2rem;
}

.subtitle { color: var(--accent-2); font-size: 1.3rem; }
.details { color: var(--muted); }
.welcome { color: var(--accent-2); font-weight: 600; }

.about, .agenda, .speakers {
  margin-top: 3rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.card {
  background: var(--panel);
  border-radius: 10px;
  padding: 1.2rem;
}

.card h3 { margin: 0.4rem 0; }

.tag {
  background: var(--accent);
  color: #fff;
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

.login-box, .dashboard {
  max-width: 400px;
  margin: 3rem auto;
  background: var(--panel);
  padding: 2rem;
  border-radius: 10px;
  text-align: center;
}

.login-box form {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  text-align: left;
  margin-top: 1rem;
}

.login-box input {
  padding: 0.5rem;
  border-radius: 6px;
  border: 1px solid var(--muted);
  background: #0f1220;
  color: var(--text);
  margin-bottom: 0.8rem;
}

.login-box button { margin-top: 0.5rem; }

.hint { color: var(--muted); font-size: 0.9rem; }
.error { color: #ff6b6b; }

footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--muted);
  font-size: 0.85rem;
}