/* Paleta de colores moderna */
:root {
    --primary: #4361ee;
    --secondary: #3f37c9;
    --accent: #4cc9f0;
    --success: #4895ef;
    --bg: #f8f9fa;
    --card-bg: #ffffff;
    --text: #2b2d42;
    --shadow: 0 8px 30px rgba(0,0,0,0.08);
}

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    line-height: 1.6;
}

/* Barra de Navegación con Gradiente */
.navbar {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: white;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar strong { font-size: 1.4rem; letter-spacing: -0.5px; }

/* Contenedor Principal con animación de entrada */
.container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1.5rem;
    animation: fadeIn 0.8s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Tarjetas Estilo "Glass" */
.card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 25px;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid rgba(255,255,255,0.3);
    transition: transform 0.3s ease;
}

.card:hover { transform: translateY(-5px); }

/* Inputs y Botones */
input[type="text"] {
    width: 100%;
    padding: 12px 18px;
    border: 2px solid #edf2f7;
    border-radius: 12px;
    outline: none;
    transition: border-color 0.3s;
}

input[type="text"]:focus { border-color: var(--accent); }

.btn {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 12px 24px;
    border-radius: 12px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

.btn:hover {
    box-shadow: 0 5px 15px rgba(67, 97, 238, 0.4);
    filter: brightness(1.1);
    transform: scale(1.02);
}

.btn-accent { background: linear-gradient(135deg, #4cc9f0, #4895ef); }

/* Roles Tags */
.role-tag {
    padding: 6px 12px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: bold;
    text-transform: uppercase;
}
.tag-profe { background: #fee2e2; color: #ef4444; border: 1px solid #fecaca; }
.tag-estu { background: #dcfce7; color: #16a34a; border: 1px solid #bbf7d0; }

/* Reacciones */
.reacciones-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 20px 0;
    padding: 10px;
    background: #f1f5f9;
    border-radius: 15px;
}

.emoji-btn {
    background: white;
    border: none;
    font-size: 1.3rem;
    padding: 8px 12px;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.emoji-btn:hover { transform: translateY(-3px) scale(1.2); }

/* Comentarios */
.comment {
    background: #f8fafc;
    padding: 15px;
    border-radius: 15px;
    margin-bottom: 10px;
    border-left: 5px solid var(--accent);
}

.comment strong { color: var(--primary); }