/* Variables de tema claro (Por defecto) */
:root {
    --bg-color: #ffffff;
    --text-color: #333333;
    --grid-border: #f0f0f0;
    --time-color: #666666;
    --header-color: #555555;
    --card-shadow: rgba(0, 0, 0, 0.08);
    --btn-bg: #435456;
    --btn-text: #ffffff;

    /* Colores únicos por curso (Modo Claro) */
    --color-textos-bg: #f6ad7b;      --color-textos-text: #2c1a0e;
    --color-equipos-bg: #8ba2a6;     --color-equipos-text: #121e20;
    --color-redes-bg: #c9daf8;       --color-redes-text: #0c2340;
    --color-software-bg: #d2f1be;    --color-software-text: #1a330e;
    --color-modelamiento-bg: #b6d7a8;--color-modelamiento-text: #1c3b12;
    --color-ingles-bg: #fcc2ff;      --color-ingles-text: #3b0e41;
    --color-web-bg: #ffe599;         --color-web-text: #3d3100;
    --color-ofimatica-bg: #d9d2e9;   --color-ofimatica-text: #2a1b40;
}

/* Variables de tema oscuro */
[data-theme="dark"] {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --grid-border: #2a2a2a;
    --time-color: #a0a0a0;
    --header-color: #cccccc;
    --card-shadow: rgba(0, 0, 0, 0.4);
    --btn-bg: #e0e0e0;
    --btn-text: #121212;

    /* Colores únicos por curso (Modo Oscuro) */
    --color-textos-bg: #804825;      --color-textos-text: #ffebd9;
    --color-equipos-bg: #2d3b3d;     --color-equipos-text: #e1f0f2;
    --color-redes-bg: #2b456e;       --color-redes-text: #e1ecff;
    --color-software-bg: #355722;    --color-software-text: #e8fcdb;
    --color-modelamiento-bg: #284c1f;--color-modelamiento-text: #e3f7dc;
    --color-ingles-bg: #632266;      --color-ingles-text: #fde8ff;
    --color-web-bg: #61501c;         --color-web-text: #fff6d9;
    --color-ofimatica-bg: #46385e;   --color-ofimatica-text: #f0ebf8;
}

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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    padding: 30px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.theme-toggle-btn {
    align-self: flex-end;
    max-width: 1100px;
    margin-bottom: 20px;
    padding: 8px 16px;
    border: none;
    border-radius: 20px;
    background-color: var(--btn-bg);
    color: var(--btn-text);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 2px 6px var(--card-shadow);
    transition: all 0.2s ease;
}

.theme-toggle-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.schedule-container {
    width: 100%;
    max-width: 1100px;
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    table-layout: fixed;
}

th, td {
    border: 1px solid var(--grid-border);
    text-align: left;
    vertical-align: top;
    height: 90px;
    padding: 8px;
    position: relative;
}

th {
    border: none;
    border-bottom: 1px solid var(--grid-border);
    font-weight: 500;
    color: var(--header-color);
    padding-bottom: 15px;
    text-align: center;
    font-size: 15px;
}

.time-col {
    width: 70px;
    border: none;
    color: var(--time-color);
    font-size: 13px;
    text-align: right;
    padding-right: 15px;
    font-weight: 400;
}

/* Tarjeta genérica de asignatura */
.card {
    border-radius: 8px;
    padding: 12px 14px;
    height: calc(100% - 10px);
    box-shadow: 0 4px 12px var(--card-shadow);
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    margin: 2px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.card-time {
    font-size: 11px;
    opacity: 0.8;
    margin-bottom: 6px;
    font-weight: 500;
}

.card-title {
    font-size: 14px;
    font-weight: 600;
    line-height: 1.3;
}

.card-sub {
    font-size: 12px;
    margin-top: 4px;
    opacity: 0.85;
}

/* Colores Asignados Unívocamente */
.bg-textos       { background-color: var(--color-textos-bg);       color: var(--color-textos-text); }
.bg-equipos      { background-color: var(--color-equipos-bg);      color: var(--color-equipos-text); }
.bg-redes        { background-color: var(--color-redes-bg);        color: var(--color-redes-text); }
.bg-software     { background-color: var(--color-software-bg);     color: var(--color-software-text); }
.bg-modelamiento { background-color: var(--color-modelamiento-bg); color: var(--color-modelamiento-text); }
.bg-ingles       { background-color: var(--color-ingles-bg);       color: var(--color-ingles-text); }
.bg-web          { background-color: var(--color-web-bg);          color: var(--color-web-text); }
.bg-ofimatica    { background-color: var(--color-ofimatica-bg);    color: var(--color-ofimatica-text); }

/* ==========================================
   ESTILOS RESPONSIVE (MÓVILES Y TABLETS)
   ========================================== */

/* Pestañas de días (Ocultas en PC) */
.day-tabs {
    display: none;
    gap: 8px;
    margin-bottom: 20px;
    width: 100%;
    max-width: 1100px;
    overflow-x: auto;
    padding-bottom: 5px;
}

.tab-btn {
    flex: 1;
    padding: 10px 14px;
    border: 1px solid var(--grid-border);
    border-radius: 8px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-weight: 600;
    font-size: 13px;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s ease;
}

.tab-btn.active {
    background-color: var(--btn-bg);
    color: var(--btn-text);
}

/* Pantallas pequeñas (menores a 768px) */
@media screen and (max-width: 768px) {
    /* Mostrar pestañas de días */
    .day-tabs {
        display: flex;
    }

    /* Ocultar el encabezado de la tabla */
    thead {
        display: none;
    }

    /* Transformar la tabla en un flujo vertical */
    table, tbody, tr, td {
        display: block;
        width: 100%;
    }

    /* Ocultar las columnas de horas laterales */
    .time-col {
        display: none;
    }

    /* Ocultar celdas por defecto; se mostrarán según el día activo */
    td[data-day] {
        display: none;
        height: auto;
        border: none;
        padding: 4px 0;
    }

    /* Mostrar solo las celdas del día seleccionado */
    body[data-active-day="lunes"] td[data-day="lunes"],
    body[data-active-day="martes"] td[data-day="martes"],
    body[data-active-day="miercoles"] td[data-day="miercoles"],
    body[data-active-day="jueves"] td[data-day="jueves"],
    body[data-active-day="viernes"] td[data-day="viernes"] {
        display: block;
    }

    /* Ajuste de tarjetas en celular */
    .card {
        height: auto;
        min-height: 85px;
        margin-bottom: 12px;
        padding: 16px;
    }

    .card-time {
        font-size: 12px;
        font-weight: bold;
    }

    .card-title {
        font-size: 15px;
    }
}