/* Tarjeta de acceso BEC (ingreso / registro), centrada. Usa los tokens de brand.css */
.bec-auth { display: flex; justify-content: center; align-items: flex-start; padding: 24px 12px 40px; }
.bec-auth-card { width: 100%; max-width: 430px; background: #fff; border-radius: 24px; padding: 30px 26px 26px; box-shadow: 0 2px 4px rgba(45, 42, 50, .05), 0 18px 48px rgba(45, 42, 50, .12); font-size: 15px; position: relative; overflow: hidden; }
.bec-auth-card::before { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 6px; background: linear-gradient(90deg, var(--bec-teal) 0 60%, var(--bec-coral) 60% 85%, var(--bec-yellow) 85%); }
.bec-auth-logo { display: block; width: 210px; max-width: 70%; height: auto; margin: 4px auto 14px; }
.bec-auth-school { display: flex; align-items: center; justify-content: center; gap: 10px; margin: 0 0 4px; font-weight: 800; font-size: 16px; color: var(--bec-ink); text-align: center; }
.bec-auth-school img { width: 34px; height: 34px; object-fit: contain; border-radius: 8px; }
.bec-auth-sub { text-align: center; color: var(--bec-muted); margin: 0 0 20px; font-size: 14px; }
.bec-auth-tabs { display: grid; grid-template-columns: 1fr 1fr; background: var(--bec-cream); border-radius: 999px; padding: 4px; margin-bottom: 20px; }
.bec-auth-tabs button { font: inherit; border: 0; background: transparent; padding: 10px 8px; border-radius: 999px; cursor: pointer; color: var(--bec-muted); font-weight: 800; }
.bec-auth-tabs button.is-active { background: var(--bec-teal); color: #fff; box-shadow: 0 2px 6px rgba(6, 122, 133, .3); }
.bec-auth-form label { display: block; font-weight: 700; font-size: 14px; margin: 0 0 14px; }
.bec-auth-form input[type="text"], .bec-auth-form input[type="email"], .bec-auth-form input[type="password"], .bec-auth-form input:not([type]) { display: block; width: 100%; margin-top: 6px; }
.bec-auth-form small { display: block; font-weight: 400; color: var(--bec-muted); margin-top: 4px; font-size: 12px; }
.bec-auth-form .bec-auth-check { font-weight: 600; display: flex; gap: 8px; align-items: center; }
.bec-auth-btn { display: block; width: 100%; font: inherit; font-weight: 900; font-size: 16px; padding: 13px; border: 0; border-radius: 999px; background: var(--bec-coral); color: #fff; cursor: pointer; margin-top: 4px; }
.bec-auth-btn:hover { background: var(--bec-coral-700); }
.bec-auth-link { display: block; text-align: center; margin-top: 14px; font-size: 14px; font-weight: 700; color: var(--bec-teal); }
.bec-auth-error { background: var(--bec-bad-50); color: var(--bec-bad); font-weight: 700; padding: 10px 14px; border-radius: 12px; margin: 0 0 16px; font-size: 14px; }
.bec-auth-form[hidden], .bec-auth-error[hidden] { display: none; }