/* Tema 7 - Variables, constantes y operadores (Lógica de Programación)
   Página: eduPL6.php
   Estilo coherente con temas anteriores: fondo oscuro, texto claro y títulos en verde. */

:root {
    --vco-green: #00c853;
    --vco-black: #000000;
    --vco-black-soft: #101010;
    --vco-black-alt: #0b0b0b;
    --vco-black-deep: #080808;
    --vco-white: #ffffff;
}

body {
    background-color: var(--vco-black);
    color: var(--vco-white);
    font-family: 'Raleway', sans-serif;
    font-size: 18px;
    font-weight: 400;
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5 {
    color: var(--vco-white);
    font-weight: 700;
}

/* =============================
   Hero compacto
   ============================= */
.vco-hero {
    position: relative;
    background: url('../images/edu/eduPL/bg-algoritmos.png') center center no-repeat;
    background-size: cover;
    padding: 60px 0;
    text-align: center;
}

.vco-hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.82), rgba(0, 0, 0, 0.95));
    z-index: 1;
}

.vco-hero .container,
.vco-hero .row,
.vco-hero-content {
    position: relative;
    z-index: 2;
}

.vco-hero-title {
    display: inline-block;
    border: 2px solid var(--vco-white);
    padding: 18px 32px;
    margin: 16px 0 12px 0;
    letter-spacing: 3px;
    text-transform: uppercase;
    font-size: 20px;
}

.vco-hero-subtitle {
    color: var(--vco-green);
    font-size: 22px;
    margin-bottom: 14px;
}

.vco-hero-text {
    max-width: 820px;
    margin: 0 auto;
    font-size: 16px;
    line-height: 1.8;
}

/* =============================
   Secciones base
   ============================= */
.vco-section {
    padding: 48px 20px;
    text-align: center;
    color: var(--vco-white);
}

.vco-section-title {
    color: var(--vco-green);
    font-size: 30px;
    font-weight: 700;
    margin-bottom: 18px;
    letter-spacing: 0.4px;
}

.vco-section-text {
    max-width: 880px;
    margin: 0 auto 16px auto;
    font-size: 16px;
    line-height: 1.8;
}

.vco-section-one {
    background-color: var(--vco-black-alt);
}

.vco-section-two {
    background-color: var(--vco-black-soft);
}

.vco-section-three {
    background-color: var(--vco-black-deep);
}

.vco-section-four {
    background-color: var(--vco-black-soft);
}

.vco-section-five {
    background-color: var(--vco-black-alt);
}

.vco-section-six {
    background-color: var(--vco-black-soft);
}

.vco-section-closing {
    background-color: var(--vco-black-deep);
}

/* Cards y bloques */
.vco-card {
    max-width: 780px;
    margin: 20px auto 0 auto;
    background-color: #0a0a0a;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    padding: 16px 18px;
    text-align: left;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.vco-card-text {
    margin: 0;
    font-size: 15px;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.9);
}

.vco-card-highlight {
    border-color: rgba(0, 200, 83, 0.25);
}

.vco-highlight {
    margin: 18px auto 0 auto;
    max-width: 640px;
    padding: 12px 16px;
    border: 1px solid rgba(0, 200, 83, 0.35);
    border-radius: 8px;
    color: var(--vco-white);
    background: rgba(0, 200, 83, 0.08);
    font-weight: 600;
    letter-spacing: 0.3px;
}

/* Listas */
.vco-list {
    list-style: none;
    padding-left: 0;
    margin: 18px auto 0 auto;
    max-width: 520px;
    text-align: left;
}

.vco-list li {
    margin: 8px 0;
    padding-left: 20px;
    position: relative;
    font-size: 15px;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.9);
}

.vco-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--vco-green);
    font-size: 18px;
}

/* Iconografia en Operadores aritmeticos */
.vco-icon-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    margin-top: 18px;
}

.vco-icon-card {
    background: #101010;
    border: 1px solid rgba(0, 255, 120, 0.18);
    border-radius: 14px;
    padding: 16px;
    text-align: left;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
}

.vco-icon {
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: rgba(0, 255, 120, 0.08);
    border: 1px solid rgba(0, 255, 120, 0.2);
    margin-bottom: 10px;
    color: var(--edu-green, #2cff7a);
    font-weight: 700;
}

.vco-icon-card h4 {
    margin: 0;
    font-size: 16px;
    color: #fff;
    font-weight: 600;
}

.vco-icon-card p {
    margin: 6px 0 0 0;
    color: rgba(255, 255, 255, 0.72);
    font-size: 13px;
    line-height: 1.35;
}

/* Buenas prácticas conceptuales */
.vco-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
    margin: 28px auto 0 auto;
    max-width: 920px;
}

.vco-card-icon {
    display: grid;
    grid-template-columns: 32px 1fr;
    gap: 14px;
    align-items: start;
    padding: 16px 18px;
}

.vco-icon {
    color: var(--vco-green);
    font-size: 22px;
    line-height: 1;
    margin-top: 2px;
}

/* Boton final */
.vco-next-wrapper {
    margin-top: 26px;
    text-align: center;
}

.vco-next-btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 4px;
    border: 2px solid var(--vco-green);
    color: var(--vco-green) !important;
    background-color: transparent;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none !important;
    letter-spacing: 0.4px;
    transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.vco-next-btn:hover,
.vco-next-btn:focus {
    background-color: var(--vco-green);
    color: var(--vco-black) !important;
    border-color: var(--vco-green);
}

/* Operadores relacionales - bloque comparador */
.rel-block {
    margin: 18px auto 0;
    max-width: 980px;
    padding: 20px 18px;
    border-radius: 18px;
    background: linear-gradient(180deg, rgba(16, 16, 16, 0.95), rgba(10, 10, 10, 0.92));
    border: 1px solid rgba(44, 255, 122, 0.14);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.rel-symbols {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 14px;
    margin-bottom: 14px;
}

.rel-s {
    font-size: 28px;
    font-weight: 800;
    color: rgba(44, 255, 122, 0.95);
    padding: 8px 12px;
    border-radius: 14px;
    background: rgba(44, 255, 122, 0.06);
    border: 1px solid rgba(44, 255, 122, 0.16);
    letter-spacing: 1px;
}

.rel-chips {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
}

.rel-chip {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    padding: 12px 12px;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.07);
}

.rel-ico {
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: rgba(44, 255, 122, 0.08);
    border: 1px solid rgba(44, 255, 122, 0.16);
    color: rgba(44, 255, 122, 0.95);
    font-size: 16px;
    flex: 0 0 auto;
}

.rel-txt {
    color: rgba(255, 255, 255, 0.88);
    font-size: 14px;
    line-height: 1.35;
}

/* =============================
   Responsivo
   ============================= */
@media (max-width: 768px) {
    .vco-hero {
        padding: 54px 0;
    }

    .vco-hero-title {
        font-size: 18px;
        padding: 14px 20px;
        letter-spacing: 2px;
    }

    .vco-hero-subtitle {
        font-size: 20px;
    }

    .vco-hero-text {
        font-size: 15px;
    }

    .vco-section {
        padding: 42px 16px;
    }

    .vco-section-title {
        font-size: 26px;
    }

    .vco-card {
        margin-top: 16px;
    }

    .vco-grid {
        grid-template-columns: 1fr;
    }

    .vco-icon-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 900px) {
    .rel-chips {
        grid-template-columns: 1fr;
    }

    .rel-s {
        font-size: 24px;
    }
}