:root {
    --bg-dark: #0f172a;
    --glass-bg: rgba(255, 255, 255, 0.07);
    --glass-border: rgba(255, 255, 255, 0.12);
    --primary-neon: #00d2ff;
    --secondary-neon: #3a7bd5;
    --text-bright: #f1f5f9;
    --text-dim: #94a3b8;
    --accent-red: #ff4757;
    --accent-green: #2ed573;
}

body, html {
    margin: 0; padding: 0;
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background: radial-gradient(circle at top right, #1e293b, #0f172a);
    color: var(--text-bright);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased; /* Suavizado de fuentes constante */
}

body {
    max-width: 500px;
    margin: 0 auto;
    background: rgba(15, 23, 42, 0.8);
    box-shadow: 0 0 50px rgba(0,0,0,0.5);
    backdrop-filter: blur(10px);
    border-left: 1px solid var(--glass-border);
    border-right: 1px solid var(--glass-border);
}

.app-header {
    padding: 30px 15px 20px;
    text-align: center;
    background: linear-gradient(180deg, rgba(0, 210, 255, 0.1) 0%, transparent 100%);
}

.app-header h1 { 
    margin: 0; 
    font-size: 1.8rem; 
    letter-spacing: 2px;
    text-transform: uppercase;
    background: linear-gradient(to right, var(--primary-neon), #fff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.app-header p { margin: 8px 0 0; font-size: 0.85rem; color: var(--text-dim); }

.lang-selector {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 15px;
}

.lang-btn {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-bright);
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.lang-btn.active {
    background: var(--primary-neon) !important;
    color: var(--bg-dark) !important;
    border-color: var(--primary-neon) !important;
    font-weight: bold;
    box-shadow: 0 0 15px rgba(0, 210, 255, 0.4);
}

.app-content { padding: 20px; }

.card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    padding: 20px;
    border-radius: 20px;
    margin-bottom: 25px;
}

.card h2 { margin-top: 0; font-size: 1.1rem; color: var(--primary-neon); text-transform: uppercase; letter-spacing: 1px; }

.input-group { margin-bottom: 15px; }
.input-group label { display: block; margin-bottom: 6px; font-size: 0.8rem; color: var(--text-dim); }
.input-group input, .input-group textarea {
    width: 100%; padding: 12px; 
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--glass-border);
    border-radius: 12px; 
    color: white;
    font-family: inherit;
    box-sizing: border-box;
}

.input-group input:focus, .input-group textarea:focus {
    outline: none;
    border-color: var(--primary-neon);
    box-shadow: 0 0 15px rgba(0, 210, 255, 0.15);
}

.btn-primary {
    width: 100%; padding: 15px; 
    background: linear-gradient(45deg, var(--secondary-neon), var(--primary-neon));
    color: white; border: none; border-radius: 12px; font-weight: bold;
    font-size: 1rem; cursor: pointer;
    box-shadow: 0 4px 15px rgba(0, 210, 255, 0.2);
    transition: transform 0.2s;
}

/* --- CORRECCIÓN DE TARJETAS --- */
.pregunta-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 16px;
    border-radius: 16px;
    margin-bottom: 12px;
    display: flex;
    gap: 12px;
    /* Forzar renderizado GPU para evitar parpadeo al final de la animación */
    backface-visibility: hidden;
    transform: translateZ(0); 
    will-change: transform, opacity;
    animation: fadeIn 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
    transition: border-color 0.4s ease;
}

.pregunta-info { flex: 1; }
.pregunta-info h4 { margin: 0 0 4px 0; font-size: 0.85rem; color: var(--primary-neon); }
.pregunta-info p { margin: 0; font-size: 0.95rem; line-height: 1.4; color: var(--text-bright); }

.btn-upvote {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 8px;
    min-width: 50px;
    color: var(--text-bright);
    cursor: pointer;
    transition: 0.3s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.btn-upvote.votado {
    background: var(--accent-red);
    border-color: var(--accent-red);
    box-shadow: 0 0 15px rgba(255, 71, 87, 0.3);
}

.hidden { display: none !important; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px) translateZ(0); }
    to { opacity: 1; transform: translateY(0) translateZ(0); }
}