:root {
    /* Paleta Premium: Oscuro con acento dorado/cobre para denotar "clase" */
    --bg-color: #0f172a; /* Slate 900 */
    --text-color: #f8fafc; /* Slate 50 */
    --accent-color: #f59e0b; /* Amber 500 */
    --accent-hover: #d97706; /* Amber 600 */
    --bg-alt: #1e293b; /* Slate 800 */
    --font-main: 'Inter', sans-serif;
    --transition-speed: 0.3s;
}

/* Reset y base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Enlace "Skip to content" para accesibilidad */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--accent-color);
    color: #000;
    padding: 8px;
    z-index: 1000;
    font-weight: 600;
    transition: top var(--transition-speed);
}

.skip-link:focus {
    top: 0;
    outline: 3px solid #fff;
    outline-offset: 2px;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

/* Tipografía de alto contraste */
h1, h2, h3 {
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--text-color);
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color var(--transition-speed);
}

a:hover, a:focus {
    color: var(--accent-hover);
    text-decoration: underline;
    outline: 2px solid var(--accent-hover);
    outline-offset: 4px;
}

/* --- Header & Navbar --- */
.main-header {
    background-color: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px); /* Glassmorphism básico */
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--bg-alt);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
}

.logo {
    height: 60px;
    width: auto;
    display: block;
}

/* Menú Hamburguesa */
.hamburger-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 102;
}

.hamburger-btn:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.hamburger-icon {
    display: block;
    width: 30px;
    height: 3px;
    background-color: var(--text-color);
    position: relative;
    transition: background-color var(--transition-speed);
}

.hamburger-icon::before,
.hamburger-icon::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 3px;
    background-color: var(--text-color);
    left: 0;
    transition: transform var(--transition-speed);
}

.hamburger-icon::before { top: -8px; }
.hamburger-icon::after { top: 8px; }

/* Estado activo del botón hamburguesa */
.hamburger-btn[aria-expanded="true"] .hamburger-icon {
    background-color: transparent;
}
.hamburger-btn[aria-expanded="true"] .hamburger-icon::before {
    transform: translateY(8px) rotate(45deg);
}
.hamburger-btn[aria-expanded="true"] .hamburger-icon::after {
    transform: translateY(-8px) rotate(-45deg);
}

/* Navegación */
.nav-list {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: var(--text-color);
    font-weight: 600;
    font-size: 1.1rem;
}

.nav-link:hover, .nav-link:focus {
    color: var(--accent-color);
    text-decoration: none;
}

/* --- Responsive Navigation --- */
@media (max-width: 768px) {
    .hamburger-btn {
        display: block;
    }

    .main-nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background-color: var(--bg-alt);
        padding-top: 80px;
        transition: right var(--transition-speed) ease-in-out;
        box-shadow: -5px 0 15px rgba(0,0,0,0.5);
    }

    .main-nav.open {
        right: 0;
    }

    .nav-list {
        flex-direction: column;
        align-items: center;
        gap: 1.5rem;
    }
}

/* --- Sections --- */
.content-section {
    padding: 5rem 0;
}

.alt-bg {
    background-color: var(--bg-alt);
}

.hero-section {
    padding: 8rem 0;
    text-align: center;
    background: linear-gradient(135deg, var(--bg-color) 0%, var(--bg-alt) 100%);
    border-bottom: 2px solid var(--accent-color);
}

.hero-section h1 {
    font-size: 3.5rem;
    color: var(--accent-color);
}

.tagline {
    font-size: 1.5rem;
    font-weight: 400;
    opacity: 0.9;
}

/* Botón de Reproducción */
.play-btn {
    background-color: var(--accent-color);
    color: #000;
    border: none;
    padding: 1rem 2rem;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color var(--transition-speed), transform 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.play-btn:hover, .play-btn:focus {
    background-color: var(--accent-hover);
    transform: scale(1.05);
    outline: 2px solid #fff;
    outline-offset: 4px;
}

/* --- Footer --- */
.main-footer {
    background-color: var(--bg-alt);
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.main-footer p {
    margin: 0.5rem 0;
}

/* --- Reproductor de radio personalizado --- */
.radio-player {
    margin-bottom: 2.5rem;
    text-align: center;
    background: linear-gradient(145deg, rgba(30, 41, 59, 0.9), rgba(15, 23, 42, 0.95));
    padding: 2rem 1.5rem;
    border-radius: 16px;
    border: 1px solid var(--accent-color);
    box-shadow: 0 8px 32px rgba(245, 158, 11, 0.1), 0 2px 8px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(8px);
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 2.5rem;
}

.radio-player__title {
    color: var(--accent-color);
    font-size: 1.6rem;
    margin-bottom: 0.25rem;
}

.radio-player__subtitle {
    font-size: 0.95rem;
    opacity: 0.7;
    margin-bottom: 1.5rem;
    font-style: italic;
}

/* Controles de reproducción */
.radio-player__controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.radio-player__btn {
    background-color: var(--bg-alt);
    color: var(--text-color);
    border: 2px solid rgba(255, 255, 255, 0.15);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all var(--transition-speed);
}

.radio-player__btn:hover,
.radio-player__btn:focus {
    background-color: var(--accent-color);
    color: #000;
    border-color: var(--accent-color);
    transform: scale(1.1);
    outline: 2px solid #fff;
    outline-offset: 3px;
    box-shadow: 0 0 16px rgba(245, 158, 11, 0.4);
}

.radio-player__btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.radio-player__btn:disabled:hover,
.radio-player__btn:disabled:focus {
    background-color: var(--bg-alt);
    color: var(--text-color);
    border-color: rgba(255, 255, 255, 0.15);
    transform: none;
    outline: none;
    box-shadow: none;
}

.radio-player__btn--main {
    width: 64px;
    height: 64px;
    font-size: 1.5rem;
    background-color: var(--accent-color);
    color: #000;
    border-color: var(--accent-color);
}

.radio-player__btn--main:hover,
.radio-player__btn--main:focus {
    background-color: var(--accent-hover);
    border-color: var(--accent-hover);
}

/* Estado "reproduciendo" del botón principal */
.radio-player__btn--main.is-playing {
    animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 8px rgba(245, 158, 11, 0.3); }
    50% { box-shadow: 0 0 24px rgba(245, 158, 11, 0.7); }
}

.radio-player__icon {
    line-height: 1;
    pointer-events: none;
}

/* Volumen */
.radio-player__volume {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.radio-player__volume-label {
    font-weight: 600;
    font-size: 0.9rem;
    white-space: nowrap;
}

.radio-player__volume-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 160px;
    height: 6px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.15);
    outline: none;
    cursor: pointer;
    transition: background var(--transition-speed);
}

.radio-player__volume-slider:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 4px;
}

/* Pulgar del slider — WebKit (Chrome, Edge, Safari) */
.radio-player__volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-color);
    border: 2px solid #fff;
    cursor: pointer;
    transition: transform 0.2s;
}

.radio-player__volume-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* Pulgar del slider — Firefox */
.radio-player__volume-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-color);
    border: 2px solid #fff;
    cursor: pointer;
}

.radio-player__volume-slider::-moz-range-track {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 3px;
    height: 6px;
}

.radio-player__volume-display {
    font-weight: 600;
    font-size: 0.9rem;
    min-width: 3ch;
    color: var(--accent-color);
}

/* Utilidad: solo para lectores de pantalla */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}