/* =========================================
   1. VARIABLES Y TEMAS
   ========================================= */
:root {
    --color-principal: #254d72;
    --color-secundario: #0eb64e;
    --bg-oscuro-fijo: #450952; 
    --bg-color: #450952;      
    --text-color: #333;
    --white: #ffffff;
    --border-color: #450952; /* Borde inicial (Púrpura) */
    --transition-speed: 0.5s;
}

/* Variables para el Modo Oscuro */
body.dark-theme {
    --bg-color: #1a1a1a;
    --white: #2d2d2d;
    --text-color: #f0f0f0;
    --color-principal: #64b5f6;
    --border-color: #0eb64e; /* CAMBIO: Borde ahora es Verde */
}

/* Suavizado de transición */
body, .container, details, summary, .content, h1, h2, .skill-item {
    transition: background-color 0.4s ease, 
                color 0.4s ease, 
                border-color 0.4s ease, 
                border-radius 0.5s ease;
}

/* =========================================
   2. ESTILOS BASE Y CONTENEDOR
   ========================================= */
body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    margin: 0;
    padding: 40px 20px;
}

.container {
    max-width: 850px;
    margin: 0 auto;
    background: var(--white);
    padding: 50px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    position: relative;
}

/* =========================================
   3. CABECERA Y TÍTULOS
   ========================================= */
header {
    text-align: center;
    border-bottom: 3px solid var(--color-secundario);
    margin-bottom: 40px;
    padding-bottom: 20px;
}

h1 { 
    margin: 0; 
    color: var(--color-principal); 
    font-size: 2.5rem;
    text-transform: uppercase;
}

.subtitle { 
    color: var(--color-secundario); 
    font-size: 1.2rem;
    font-weight: 600;
}

h2 {
    color: var(--color-principal);
    border-left: 5px solid var(--color-secundario);
    padding-left: 15px;
    margin-top: 30px;
}

/* =========================================
   4. DESPLEGABLES (REVISADO)
   ========================================= */
details {
    background: var(--white);
    margin-bottom: 12px;
    overflow: hidden;
    /* Usamos la variable dinámica para el color del borde */
    border: var(--border-color) 2px solid;
    border-radius: 115px; 
    max-height: 60px;
    transition: border-radius var(--transition-speed) ease-in-out,
                max-height var(--transition-speed) ease-in-out,
                border-color 0.4s ease,
                transform 0.2s ease;
}

details:hover {
    transform: translateY(-2px);
}

details[open] {
    border-radius: 15px;
    max-height: 1000px;
}

summary {
    padding: 18px 30px;
    font-weight: bold;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--white);
}

summary::-webkit-details-marker { display: none; }

summary::after {
    content: '↓';
    display: inline-block;
    transition: transform 0.4s cubic-bezier(0.6, -0.28, 0.735, 0.045);
    color: var(--color-secundario);
    font-weight: bold;
}

details[open] summary::after { transform: rotate(180deg); }

.content {
    padding: 20px 30px;
    background-color: rgba(0,0,0,0.03);
    animation: fadeIn 0.5s ease-out;
}

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

/* =========================================
   5. BOTÓN FLOTANTE
   ========================================= */
.btn-flotante {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--border-color); /* Sigue al color del borde */
    color: white;
    border: 2px solid var(--color-secundario);
    font-size: 24px;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* =========================================
   6. APTITUDES (SKILLS)
   ========================================= */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 12px;
}

.skill-item {
    background: var(--color-principal);
    color: white;
    padding: 8px;
    border-radius: 6px;
    text-align: center;
    font-weight: 500;
}

/* En modo oscuro, los skills también se vuelven púrpuras con borde verde */
body.dark-theme .skill-item {
    background-color: var(--bg-oscuro-fijo);
    border: 1px solid var(--border-color); /* Borde verde en modo oscuro */
}

/* =========================================
   7. RESPONSIVE
   ========================================= */
@media (max-width: 600px) {
    .container { padding: 25px; }
    h1 { font-size: 1.8rem; }
    summary { padding: 15px 20px; }
}