:root {
    --acento: #2c4a6e;
    --acento-oscuro: #1e3550;
    --acento-suave: #eef2f6;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    background: #f2f4f7;
    min-height: 100vh;
    padding: 40px 20px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}
.form-wrapper { max-width: 660px; margin: 0 auto; }
@media (min-width: 992px) {
    .form-wrapper { max-width: 840px; }
}
.form-card {
    background: #ffffff;
    border-radius: 14px;
    border-top: 4px solid var(--acento);
    box-shadow: 0 4px 20px rgba(15, 23, 42, 0.08);
    padding: 50px 45px;
    overflow: hidden;
}
.header-section {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 2px solid #f0f0f0;
}
.logo-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 20px;
}
.logo-wrap img {
    max-height: 90px;
    max-width: 100%;
    object-fit: contain;
}
.logo-wrap .logo-icono {
    font-size: 2.6rem;
    color: var(--acento);
}
.academy-name {
    font-size: 1.3rem;
    font-weight: 700;
    color: #333;
    letter-spacing: -0.5px;
}
h2 {
    font-size: 1.8rem;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 12px;
}
.subtitle {
    color: #666;
    font-size: 1rem;
    line-height: 1.6;
    margin: 0;
}
.required-note {
    font-size: 0.9rem;
    color: #666;
    margin: 30px 0 25px;
    padding: 12px 16px;
    background: var(--acento-suave);
    border-left: 4px solid var(--acento);
    border-radius: 4px;
}
.section-title {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--acento);
    border-bottom: 2px solid #e9ecef;
    padding-bottom: 10px;
    margin: 32px 0 20px;
}
.form-label {
    font-weight: 600;
    color: #1a1a1a;
    font-size: 0.95rem;
    margin-bottom: 8px;
}
.form-control, .form-select {
    border: 1.5px solid #e0e0e0;
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 0.95rem;
    transition: border-color .15s ease, box-shadow .15s ease;
}
.form-control:focus, .form-select:focus {
    border-color: var(--acento);
    box-shadow: 0 0 0 0.2rem rgba(44, 74, 110, 0.12);
}
.form-check {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding-left: 0;
    margin-bottom: 12px;
}
.form-check .form-check-input {
    float: none;
    margin-left: 0;
}
.form-check-input {
    flex: 0 0 auto;
    border: 1.5px solid #d0d0d0;
    border-radius: 4px;
    margin-top: 0.2rem;
    width: 18px;
    height: 18px;
    accent-color: var(--acento);
    cursor: pointer;
}
.form-check-label {
    color: #333;
    cursor: pointer;
    font-size: 0.95rem;
}
.text-small {
    font-size: 0.88rem;
}
.asignaturas-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
    gap: 10px;
}
.asignatura-chip {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0;
    padding: 12px 14px;
    border: 1.5px solid #e2e4ea;
    border-radius: 10px;
    background: #fff;
    cursor: pointer;
    transition: border-color .15s, background-color .15s, box-shadow .15s;
}
.asignatura-chip:hover {
    border-color: var(--acento);
}
.asignatura-chip input {
    flex: 0 0 auto;
    width: 18px;
    height: 18px;
    margin: 0;
    accent-color: var(--acento);
    cursor: pointer;
}
.asignatura-chip span {
    font-size: 0.92rem;
    line-height: 1.25;
    color: #333;
}
.asignatura-chip.selected {
    border-color: var(--acento);
    background: var(--acento-suave);
    box-shadow: inset 0 0 0 1px var(--acento);
}
.btn-submit {
    width: 100%;
    padding: 14px;
    font-size: 1rem;
    font-weight: 600;
    background: var(--acento);
    border: none;
    color: white;
    border-radius: 8px;
    margin-top: 24px;
    transition: background-color .15s ease, transform .15s ease;
    cursor: pointer;
}
.btn-submit:hover {
    background: var(--acento-oscuro);
    transform: translateY(-1px);
}
.alert {
    margin-bottom: 25px;
    border: none;
    border-left: 4px solid;
    border-radius: 4px;
}
.alert-danger { background-color: #fff5f5; border-left-color: #e05260; }
.alert-info { background-color: var(--acento-suave); border-left-color: var(--acento); }
.campo-oculto {
    position: absolute;
    left: -9999px;
    top: -9999px;
}
#seccion-tutor { display: none; }
textarea { resize: vertical; }