/* =========================
   RESET
========================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

/* =========================
   FONDO SUAVE PREMIUM
========================= */
body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;

    /* degradado elegante belleza/spa */
    background: linear-gradient(135deg, #f7f9fb, #e8f5ec, #f2f7f3);
}

/* =========================
   CONTENEDOR TARJETA
========================= */
.container {
    width: 420px;
    padding: 45px 40px;

    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(6px);

    border-radius: 22px;
    box-shadow:
        0 20px 40px rgba(0, 0, 0, 0.08),
        0 5px 15px rgba(0, 0, 0, 0.04);

    text-align: center;
    border-top: 7px solid #b0d6ac;

    animation: fadeIn 0.5s ease;
}

/* Animación entrada */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(25px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =========================
   ICONO DECORATIVO
========================= */
.icon {
    font-size: 32px;
    width: 70px;
    height: 70px;
    margin: 0 auto 18px;

    display: flex;
    align-items: center;
    justify-content: center;

    border-radius: 50%;
    background: linear-gradient(135deg, #9ec99b, #b0d6ac);
    color: white;

    box-shadow: 0 8px 18px rgba(158, 201, 155, 0.4);
}

/* =========================
   TEXTOS
========================= */
h2 {
    font-size: 22px;
    font-weight: 700;
    color: #333;
    margin-bottom: 8px;
}

.subtitle {
    font-size: 14px;
    color: #666;
    margin-bottom: 28px;
}

/* =========================
   FORM
========================= */
.form-group {
    text-align: left;
    margin-bottom: 20px;
}

label {
    font-size: 13px;
    font-weight: 600;
    color: #555;
}

/* =========================
   INPUTS MODERNOS
========================= */
input[type="email"],
input[type="password"] {
    width: 100%;
    padding: 14px;
    margin-top: 6px;

    border-radius: 14px;
    border: 1px solid #e2e2e2;

    font-size: 14px;
    background: #fafafa;

    transition: 0.3s;
}

input::placeholder {
    color: #aaa;
}

input:focus {
    outline: none;
    background: #fff;
    border-color: #9ec99b;
    box-shadow: 0 0 0 3px rgba(158, 201, 155, 0.25);
    transform: scale(1.01);
}

/* =========================
   BOTÓN PREMIUM
========================= */
button,
input[type="submit"] {
    width: 100%;
    padding: 14px;

    border: none;
    border-radius: 16px;

    background: linear-gradient(135deg, #9ec99b, #b0d6ac);
    color: white;

    font-size: 15px;
    font-weight: bold;
    letter-spacing: 0.5px;

    cursor: pointer;
    transition: 0.3s;
}

button:hover,
input[type="submit"]:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 25px rgba(158, 201, 155, 0.45);
}

button:active {
    transform: scale(0.97);
}

button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

/* =========================
   LINK VOLVER
========================= */
.back-link {
    margin-top: 22px;
    font-size: 14px;
}

.back-link a {
    color: #6b3fa0;
    font-weight: 600;
    text-decoration: none;
    transition: 0.2s;
}

.back-link a:hover {
    color: #4F6F6A;
    text-decoration: underline;
}

/* =========================
   LOADING SPINNER
========================= */
.loading {
    display: inline-block;
    width: 14px;
    height: 14px;

    border: 2px solid white;
    border-top: 2px solid transparent;

    border-radius: 50%;
    margin-left: 8px;

    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* =========================
   RESPONSIVE
========================= */
@media (max-width: 480px) {
    .container {
        width: 92%;
        padding: 35px 25px;
    }
}