* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: "Segoe UI", Arial, sans-serif;
}

body {
    background: #0f172a;
    color: #e2e8f0;
    min-height: 100vh;
}

/* ==========================
   HEADER
========================== */

header {
    background: #111827;
    padding: 30px;
    text-align: center;
    border-bottom: 1px solid #334155;
}

header h1 {
    font-size: 2.4rem;
    margin-bottom: 10px;
}

header p {
    color: #94a3b8;
}

/* ==========================
   GENERAL
========================== */

section {
    width: 90%;
    max-width: 1200px;
    margin: 30px auto;
}

h2 {margin-bottom: 20px;}

.hidden {display: none;}

/* ==========================
   LOGIN
========================== */

#login {text-align: center;}

#login input {display: inline-block;}

input {
    width: 250px;
    padding: 12px;
    margin: 10px;
    border-radius: 8px;
    border: none;
    outline: none;
    background: #1e293b;
    color: white;
}

input::placeholder {color: #94a3b8;}

/* ==========================
   BOTONES
========================== */

button {
    background: #2563eb;
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.3s;
    margin: 5px;
}

button:hover {background: #1d4ed8;}

#btnLogout {
    background: #dc2626;
    white-space: nowrap;
}

#btnLogout:hover {background: #b91c1c;}

/* ==========================
   DASHBOARD HEADER
========================== */

.dashboard-header {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.dashboard-header .cards {flex: 1;}

/* ==========================
   DASHBOARD CARDS
========================== */

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.card {
    background: #1e293b;
    padding: 25px;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.25);
}

.card h3 {
    color: #94a3b8;
    margin-bottom: 10px;
}

.card p {
    font-size: 1.8rem;
    font-weight: bold;
}

/* ==========================
   MERCADO
========================== */

#listaActivos {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.activo {
    background: #1e293b;
    padding: 20px;
    border-radius: 12px;
    transition: 0.3s;
}

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

.activo h3 {margin-bottom: 10px;}

.activo span {
    color: #38bdf8;
    font-size: 1.3rem;
}

/* ==========================
   CARTERA
========================== */

#miCartera {overflow-x: auto;}

.tabla-cartera {
    width: 100%;
    border-collapse: collapse;
    background: #1e293b;
    border-radius: 12px;
    overflow: hidden;
}

.tabla-cartera th {
    background: #334155;
    padding: 15px;
    text-align: left;
}

.tabla-cartera td {
    padding: 15px;
    border-bottom: 1px solid #334155;
}

.tabla-cartera tr:hover {background: #273449;}

.btnVender {
    background: #dc2626;
    padding: 8px 14px;
    font-size: 0.9rem;
}

.btnVender:hover {background: #b91c1c;}

.ganancia {
    color: #22c55e;
    font-weight: bold;
}

.perdida {
    color: #ef4444;
    font-weight: bold;
}

.card-vacia {
    background: #1e293b;
    padding: 30px;
    text-align: center;
    border-radius: 15px;
}

/* ==========================
   GRAFICOS
========================== */

.graficos {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.graficos div {
    background: #1e293b;
    padding: 20px;
    border-radius: 15px;
}

canvas {max-height: 350px;}

/* ==========================
   RESPONSIVE
========================== */

@media (max-width:700px) {
    input {
        width: 100%;
        margin: 5px 0;
    }
    button {
        width: 100%;
        margin-top: 10px;
    }
    .dashboard-header {flex-direction: column;}
    .cards {grid-template-columns: 1fr;}
    #btnLogout {width: 100%;}
}