/* ============================
   VARIABLES Y BASE
   ============================ */

:root {
    --color-primario: #0a3d62;
    --color-secundario: #3c6382;
    --color-acento: #38ada9;
    --color-fondo: #f5f7fa;
    --color-texto: #2d3436;
    --color-blanco: #ffffff;
    --color-gris: #dfe6e9;
    --color-sombra: rgba(0,0,0,0.08);

    --radio: 8px;
    --transicion: 0.25s ease;
    --fuente: 'Inter', 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    font-family: var(--fuente);
    background: var(--color-fondo);
    color: var(--color-texto);
    margin: 0;
    padding: 0;
}

/* ============================
   CONTENEDORES Y CARDS
   ============================ */

.contenedor {
    max-width: 1100px;
    margin: 40px auto;
    padding: 0 20px;
}

.card {
    background: var(--color-blanco);
    border-radius: var(--radio);
    padding: 25px;
    box-shadow: 0 4px 12px var(--color-sombra);
    margin-bottom: 25px;
    transition: transform var(--transicion), box-shadow var(--transicion);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 18px var(--color-sombra);
}

/* ============================
   TITULOS Y TEXTOS
   ============================ */

h1, h2, h3 {
    font-weight: 600;
    color: var(--color-primario);
    margin-top: 0;
    margin-bottom: 15px;
}

p {
    margin-top: 0;
    margin-bottom: 10px;
}

/* ============================
   FORMULARIOS
   ============================ */

label {
    font-weight: 600;
    display: block;
    margin-bottom: 6px;
    margin-top: 12px;
}

input[type="text"],
input[type="password"],
input[type="number"],
input[type="date"],
select,
textarea {
    width: 100%;
    padding: 10px 12px;
    border-radius: var(--radio);
    border: 1px solid var(--color-gris);
    background: #fff;
    transition: border-color var(--transicion), box-shadow var(--transicion), background var(--transicion);
    font-size: 14px;
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--color-primario);
    box-shadow: 0 0 0 3px rgba(10, 61, 98, 0.15);
    outline: none;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 4px;
}

/* ============================
   BOTONES
   ============================ */

.btn {
    display: inline-block;
    padding: 10px 18px;
    border-radius: var(--radio);
    border: none;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: background var(--transicion), transform var(--transicion), box-shadow var(--transicion);
    text-decoration: none;
}

.btn-primario {
    background: var(--color-primario);
    color: var(--color-blanco);
}

.btn-primario:hover {
    background: var(--color-secundario);
    transform: translateY(-1px);
    box-shadow: 0 3px 8px var(--color-sombra);
}

.btn-secundario {
    background: var(--color-acento);
    color: var(--color-blanco);
}

.btn-secundario:hover {
    background: #079992;
    transform: translateY(-1px);
    box-shadow: 0 3px 8px var(--color-sombra);
}

/* ============================
   TABLAS
   ============================ */

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
    font-size: 14px;
}

table thead {
    background: var(--color-primario);
    color: var(--color-blanco);
}

table th,
table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--color-gris);
    text-align: left;
}

table tr:nth-child(even) {
    background: #f0f4f8;
}

table tr:hover {
    background: #e8f0f8;
}

/* ============================
   ALERTAS
   ============================ */

.alerta {
    padding: 12px 15px;
    border-radius: var(--radio);
    margin-bottom: 15px;
    font-size: 14px;
}

.alerta-exito {
    background: #dff9fb;
    border-left: 5px solid #22a6b3;
}

.alerta-error {
    background: #ffcccc;
    border-left: 5px solid #eb4d4b;
}

/* ============================
   BARRA SUPERIOR SIMPLE
   ============================ */

.topbar {
    width: 100%;
    padding: 15px 20px;
    background: var(--color-primario);
    color: var(--color-blanco);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.topbar h2 {
    margin: 0;
    color: var(--color-blanco);
    font-weight: 600;
    font-size: 20px;
}

/* ============================
   RESPONSIVE - MÓVIL
   ============================ */

@media (max-width: 768px) {

    /* Contenedor más compacto */
    .contenedor {
        padding: 10px;
        margin: 20px auto;
    }

    /* Cards más suaves */
    .card {
        padding: 18px;
    }

    /* Topbar en columna */
    .topbar {
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }

    .topbar h2 {
        font-size: 18px;
    }

    /* Formularios */
    label {
        margin-top: 10px;
    }

    input,
    select,
    textarea {
        font-size: 16px;
        padding: 12px;
    }

    .btn {
        width: 100%;
        text-align: center;
        padding: 12px;
        font-size: 16px;
    }

    /* Tablas scrollables */
    table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
        font-size: 13px;
    }

    table th,
    table td {
        padding: 8px 10px;
    }
}

/* ============================
   RESPONSIVE - MÓVIL PEQUEÑO
   ============================ */

@media (max-width: 480px) {

    h1, h2, h3 {
        font-size: 18px;
    }

    .card {
        padding: 15px;
    }

    .btn {
        font-size: 15px;
        padding: 10px;
    }

    input,
    select,
    textarea {
        font-size: 15px;
        padding: 10px;
    }

    table {
        font-size: 12px;
    }
}

/* ============================
   MENÚ RESPONSIVE
   ============================ */

.menu-toggle {
    display: none;
    font-size: 26px;
    cursor: pointer;
    padding: 5px 10px;
    border-radius: 6px;
    background: var(--color-secundario);
    color: white;
}

.menu {
    display: flex;
    align-items: center;
    gap: 15px;
}

/* ======== MÓVIL ======== */
@media (max-width: 768px) {

    .menu-toggle {
        display: block;
    }

    .menu {
        display: none;
        flex-direction: column;
        background: var(--color-primario);
        width: 100%;
        padding: 15px 0;
        margin-top: 10px;
        border-radius: 8px;
        animation: fadeIn 0.3s ease;
    }

    .menu a,
    .menu span {
        color: white;
        text-align: center;
        width: 100%;
        padding: 10px 0;
    }

    .menu a.btn {
        width: 90%;
        margin: auto;
    }
}

/* Animación suave */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to   { opacity: 1; transform: translateY(0); }
}