* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: 'Segoe UI', Arial, sans-serif;
    background: #0f172a;
    color: #e2e8f0;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: #111827;
    border-bottom: 1px solid #1f2937;
}

.navbar-brand { font-size: 1.4rem; font-weight: bold; }
.navbar-brand span { color: #38bdf8; }

.navbar nav a {
    color: #e2e8f0;
    text-decoration: none;
    margin-left: 1.2rem;
}

.navbar nav a:hover { color: #38bdf8; }

.welcome { margin-left: 1.2rem; color: #94a3b8; }

.btn-outline {
    border: 1px solid #38bdf8;
    padding: 0.4rem 0.9rem;
    border-radius: 6px;
}

main { max-width: 1000px; margin: 0 auto; padding: 2rem 1.5rem; }

.hero { text-align: center; padding: 3rem 1rem; }
.hero h1 { font-size: 3rem; margin-bottom: 0.2rem; color: #38bdf8; }
.subtitle { font-size: 1.2rem; color: #94a3b8; margin-bottom: 2rem; }

.hero-info {
    display: flex;
    justify-content: center;
    gap: 2.5rem;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.section { margin-top: 3rem; }
.section h2 { border-left: 4px solid #38bdf8; padding-left: 0.6rem; margin-bottom: 1.2rem; }

.agenda-table { width: 100%; border-collapse: collapse; background: #111827; border-radius: 8px; overflow: hidden; }
.agenda-table th, .agenda-table td { padding: 0.8rem 1rem; border-bottom: 1px solid #1f2937; text-align: left; }
.agenda-table th { background: #1f2937; }

.speakers-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1.2rem; }
.speaker-card { background: #111827; padding: 1.2rem; border-radius: 8px; border: 1px solid #1f2937; }
.speaker-card h3 { margin: 0 0 0.3rem; color: #38bdf8; }
.speaker-card .role { color: #94a3b8; font-size: 0.9rem; margin-bottom: 0.6rem; }

.api-hint { margin-top: 0.8rem; color: #64748b; font-size: 0.9rem; }
.api-hint code { background: #1f2937; padding: 0.15rem 0.4rem; border-radius: 4px; }

.login-section { display: flex; justify-content: center; }
.login-card {
    background: #111827;
    padding: 2rem;
    border-radius: 10px;
    border: 1px solid #1f2937;
    width: 100%;
    max-width: 380px;
}
.login-card h2 { margin-top: 0; }
.hint { color: #94a3b8; font-size: 0.85rem; }
.login-card form { display: flex; flex-direction: column; }
.login-card label { margin-top: 1rem; margin-bottom: 0.3rem; font-size: 0.9rem; }
.login-card input {
    padding: 0.6rem;
    border-radius: 6px;
    border: 1px solid #334155;
    background: #0f172a;
    color: #e2e8f0;
}
.login-card button {
    margin-top: 1.5rem;
    padding: 0.7rem;
    border: none;
    border-radius: 6px;
    background: #38bdf8;
    color: #0f172a;
    font-weight: bold;
    cursor: pointer;
}
.login-card button:hover { background: #0ea5e9; }
.error { color: #f87171; }

footer { text-align: center; padding: 1.5rem; color: #64748b; font-size: 0.85rem; }