:root {
    --azul-oscuro: #0b1f3a;
    --azul: #123f73;
    --azul-claro: #1f6aa5;
    --azul-suave: #eaf3fb;
    --dorado: #f3b629;
    --texto: #26364a;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: #f4f8fc;
    color: var(--texto);
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    display: flex;
    width: 100%;
    min-height: 78px;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 14px 5%;
    background: rgba(11, 31, 58, .96);
    box-shadow: 0 4px 18px rgba(11, 31, 58, .18);
}

.logo h1 {
    color: white;
    font-size: clamp(17px, 2vw, 24px);
    letter-spacing: 1px;
}

nav ul {
    display: flex;
    align-items: center;
    gap: clamp(12px, 2vw, 28px);
    list-style: none;
}

nav ul li a,
.menu-sistema summary {
    color: #e8f2fc;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    transition: color .2s ease;
}

nav ul li a:hover,
.menu-sistema summary:hover {
    color: var(--dorado);
}

.menu-sistema {
    position: relative;
}

.menu-sistema summary {
    cursor: pointer;
    list-style: none;
}

.menu-sistema summary::-webkit-details-marker {
    display: none;
}

.menu-sistema ul {
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    z-index: 10;
    min-width: 190px;
    padding: 8px 0;
    background: #0f172a;
    border-radius: 8px;
    box-shadow: 0 12px 30px rgba(15, 23, 42, .25);
}

.menu-sistema ul li a {
    display: block;
    padding: 10px 16px;
    white-space: nowrap;
}

.menu-sistema ul li a:hover {
    background: #173b68;
}

.sistema-page {
    min-height: 100vh;
    background: linear-gradient(135deg, var(--azul-oscuro), var(--azul));
}

.sistema-contenedor {
    width: min(100% - 36px, 900px);
    margin: 0 auto;
    padding: 42px 0 70px;
}

.sistema-regresar {
    color: #dceafa;
    font-weight: 600;
    text-decoration: none;
}

.sistema-regresar:hover {
    color: var(--dorado);
}

.sistema-encabezado {
    margin: 100px 0 42px;
}

.sistema-etiqueta {
    color: var(--dorado);
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 2px;
}

.sistema-encabezado h1 {
    max-width: 700px;
    margin-top: 12px;
    color: white;
    font-size: clamp(36px, 6vw, 64px);
    line-height: 1.08;
}

.sistema-encabezado p {
    margin-top: 16px;
    color: #dceafa;
    font-size: 18px;
}

.sistema-opciones {
    display: grid;
    gap: 16px;
}

.sistema-tarjeta {
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 22px 24px;
    color: var(--texto);
    text-decoration: none;
    background: white;
    border: 1px solid rgba(255, 255, 255, .5);
    border-radius: 14px;
    box-shadow: 0 12px 24px rgba(5, 21, 43, .15);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}

.sistema-tarjeta:hover {
    background: #f5fbff;
    box-shadow: 0 16px 30px rgba(5, 21, 43, .24);
    transform: translateY(-4px);
}

.sistema-icono {
    display: grid;
    width: 54px;
    height: 54px;
    flex: none;
    place-items: center;
    color: white;
    font-size: 19px;
    font-weight: 800;
    background: var(--azul-claro);
    border-radius: 12px;
}

.sistema-tarjeta-contenido {
    flex: 1;
}

.sistema-tarjeta strong,
.sistema-tarjeta small {
    display: block;
}

.sistema-tarjeta strong {
    color: var(--azul);
    font-size: 20px;
}

.sistema-tarjeta small {
    margin-top: 3px;
    color: #64788e;
}

.sistema-flecha {
    color: var(--azul-claro);
    font-size: 28px;
    line-height: 1;
}

#inicio {
    display: flex;
    min-height: 700px;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    padding: 150px 6% 80px;
    text-align: center;
    background: linear-gradient(135deg, rgba(11, 31, 58, .98), rgba(18, 63, 115, .92));
}

#inicio h2 {
    max-width: 900px;
    color: white;
    font-size: clamp(34px, 5vw, 62px);
    line-height: 1.1;
}

#inicio p {
    max-width: 720px;
    margin: 22px auto 34px;
    color: #dceafa;
    font-size: clamp(17px, 2vw, 21px);
}

#inicio div {
    display: grid;
    width: min(100%, 1000px);
    min-height: 260px;
    place-items: center;
    color: #28527e;
    font-size: clamp(18px, 3vw, 28px);
    font-weight: 700;
    background: linear-gradient(135deg, #d9ebfa, #ffffff);
    border: 1px solid rgba(255, 255, 255, .5);
    border-radius: 18px;
    box-shadow: 0 22px 45px rgba(5, 21, 43, .28);
}

section:not(#inicio) {
    width: min(90%, 1120px);
    margin: 64px auto;
    padding: clamp(30px, 6vw, 64px);
    background: white;
    border-top: 5px solid var(--azul-claro);
    border-radius: 16px;
    box-shadow: 0 12px 35px rgba(22, 64, 103, .09);
}

section h2 {
    margin-bottom: 20px;
    color: var(--azul);
    font-size: clamp(28px, 4vw, 40px);
}

section p {
    color: #526579;
    font-size: 18px;
}

#contacto h3 {
    margin-top: 22px;
    color: var(--azul-claro);
}

footer {
    margin-top: 80px;
    padding: 32px 20px;
    color: #dbe9f7;
    text-align: center;
    background: var(--azul-oscuro);
}

@media (max-width: 900px) {
    header {
        align-items: flex-start;
        flex-direction: column;
        padding: 16px 5%;
    }

    nav ul {
        flex-wrap: wrap;
        gap: 10px 18px;
    }

    #inicio {
        min-height: 680px;
        padding-top: 190px;
    }
}

@media (max-width: 560px) {
    nav ul li a,
    .menu-sistema summary {
        font-size: 13px;
    }

    #inicio div {
        min-height: 190px;
    }

    section:not(#inicio) {
        width: calc(100% - 28px);
        margin: 36px auto;
    }
}