/* Landing-page introduction to Classroom. No shared app styles. */
.landing-header .nav-buttons { flex-wrap: wrap; }
.landing-main .landing-classroom {
    background: linear-gradient(135deg, #f5f3ff 0%, #eef2ff 55%, #f0fdfa 100%);
    border-block: 1px solid #e0e7ff;
    scroll-margin-top: 150px;
}
.landing-classroom .lc-layout {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.15fr 1fr;
    gap: clamp(28px, 5vw, 72px);
    align-items: center;
}
.landing-classroom .lc-eyebrow {
    display: inline-block;
    margin-bottom: 16px;
    padding: 7px 14px;
    border-radius: 999px;
    color: #4338ca;
    background: #e0e7ff;
    font-size: .85rem;
    font-weight: 800;
}
.landing-classroom h2 {
    margin: 0 0 20px;
    color: #1e1b4b;
    font-size: clamp(2rem, 3.1vw, 2.8rem);
    line-height: 1.15;
    text-align: left;
}
.landing-classroom .lc-intro { color: #4b5563; font-size: 1.08rem; line-height: 1.75; margin: 0; }
.landing-classroom .lc-actions { display: flex; flex-wrap: wrap; gap: 20px 16px; margin: 26px 0; }
.landing-classroom .lc-actions > div { min-width: 0; }
.landing-classroom .lc-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    box-sizing: border-box;
    min-height: 48px;
    padding: 12px 22px;
    border: 2px solid transparent;
    border-radius: 999px;
    font-size: 1rem;
    font-weight: 800;
    text-decoration: none;
    transition: background-color .2s, box-shadow .2s;
}
.landing-classroom .lc-open { background: #4f46e5; color: #fff; box-shadow: 0 5px 16px #4f46e52b; }
.landing-classroom .lc-open:hover { background: #4338ca; box-shadow: 0 7px 20px #4f46e540; }
.landing-classroom .lc-join { background: #fff; color: #4338ca; border-color: #c7d2fe; }
.landing-classroom .lc-join:hover { background: #eef2ff; border-color: #4f46e5; }
.landing-classroom .lc-button:focus-visible { outline: 3px solid #4338ca; outline-offset: 4px; }
.landing-classroom .lc-action-note { display: block; margin-top: 9px; font-size: .75rem; color: #4b5563; text-align: center; }
.landing-classroom .lc-help { color: #4b5563; font-size: .95rem; line-height: 1.7; margin: 0; }
.landing-classroom .lc-help strong { color: #1e1b4b; }
.landing-classroom .lc-flow { padding: 28px; border: 1px solid #e0e7ff; border-radius: 24px; background: #fff; box-shadow: 0 12px 32px #312e8110; }
.landing-classroom .lc-flow-heading { display: flex; gap: 12px; align-items: center; margin-bottom: 24px; }
.landing-classroom .lc-flow-heading img { flex-shrink: 0; object-fit: contain; }
.landing-classroom .lc-flow-heading h3 { margin: 0; font-size: 1.2rem; line-height: 1.4; color: #1e1b4b; text-align: left; }
.landing-classroom .lc-steps { display: grid; gap: 22px; padding: 0; margin: 0; list-style: none; }
.landing-classroom .lc-steps li { display: flex; gap: 14px; align-items: flex-start; }
.landing-classroom .lc-step-number { display: grid; place-items: center; width: 32px; height: 32px; flex-shrink: 0; border-radius: 50%; color: #4338ca; background: #eef2ff; font-weight: 800; }
.landing-classroom .lc-steps h4 { margin: 2px 0 5px; color: #1f2937; font-size: 1rem; }
.landing-classroom .lc-steps p { margin: 0; color: #4b5563; font-size: .93rem; line-height: 1.6; }
.landing-classroom .lc-recap { margin: 22px 0 0; padding-top: 18px; border-top: 1px solid #e5e7eb; color: #4b5563; font-size: .85rem; line-height: 1.6; }
@media (max-width: 900px) {
    .landing-classroom .lc-layout { grid-template-columns: 1fr; max-width: 660px; }
}
@media (max-width: 480px) {
    .landing-header .nav-buttons { gap: 8px 0; }
    .landing-classroom .lc-actions > div, .landing-classroom .lc-button { width: 100%; }
    .landing-classroom .lc-flow { padding: 22px 18px; }
}
@media (prefers-reduced-motion: reduce) {
    .landing-classroom .lc-button { transition: none; }
}