:root {
    --bg: #0f172a;
    --bg-grad: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --accent: #38bdf8;
    --text-main: #f8fafc;
    --text-dim: #94a3b8;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, var(--bg), var(--bg-grad));
    color: var(--text-main);
    height: 100vh;
    height: 100dvh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 1.5rem;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(56, 189, 248, 0.07) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(56, 189, 248, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.container {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2.5rem;
    width: 100%;
    max-width: 460px;
}

.title {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.6rem;
}

.title p {
    font-size: 0.95rem;
    color: var(--text-dim);
}

.role-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
}

.role-btn {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: 1.75rem 2rem;
    border-radius: 20px;
    background: var(--card-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    color: var(--text-main);
    text-decoration: none;
    transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.role-btn:hover {
    transform: translateY(-3px);
    border-color: var(--accent);
    box-shadow: 0 14px 40px rgba(56, 189, 248, 0.18), 0 0 0 1px var(--accent);
}

.role-btn:active {
    transform: translateY(0);
}

.role-btn.speaker {
    border-top: 3px solid var(--accent);
}

.role-icon {
    font-size: 2rem;
    margin-bottom: 0.65rem;
    line-height: 1;
}

.role-label {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.role-desc {
    font-size: 0.85rem;
    color: var(--text-dim);
    line-height: 1.5;
}

@media (max-width: 480px) {
    .title h1 {
        font-size: 1.6rem;
    }

    .role-btn {
        padding: 1.4rem 1.5rem;
    }
}

.copyright {
    position: fixed;
    bottom: 0.9rem;
    left: 0;
    right: 0;
    text-align: center;
    font-size: 0.7rem;
    color: var(--text-dim);
    pointer-events: none;
    z-index: 1;
}