:root {
    --tr-navy: #1B3B4B;
    --tr-navy-light: #3D5A6C;
    --tr-sage: #A8C4BE;
    --tr-warm-gray: #E8EBEA;
    --tr-gold: #C9A227;
}

html, body {
    height: 100%;
}

body.login-body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    background: linear-gradient(135deg, var(--tr-navy) 0%, var(--tr-navy-light) 100%);
    position: relative;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* Marca de agua: el logo en blanco, bien visible, a la izquierda del formulario */
body.login-body::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 30%;
    width: 1300px;
    height: 1040px;
    background-image: url("../img/trainec-logo.svg");
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    transform: translate(-50%, -50%) rotate(-8deg);
    filter: brightness(0) invert(1);
    opacity: 0.14;
    pointer-events: none;
}

.login-card {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 400px;
    margin: 24px 8vw 24px 24px;
    background: #ffffff;
    border-radius: 18px;
    box-shadow: 0 20px 50px rgba(13, 38, 60, 0.35);
    overflow: hidden;
}

@media (max-width: 860px) {
    body.login-body {
        justify-content: center;
    }

    body.login-body::before {
        left: 50%;
    }

    .login-card {
        margin: 24px;
    }
}

.login-card__accent {
    height: 6px;
    background: linear-gradient(90deg, var(--tr-gold) 0%, var(--tr-sage) 100%);
}

.login-card__body {
    padding: 40px 36px 32px;
}

.login-card__logo {
    display: block;
    width: 96px;
    height: auto;
    margin: 0 auto 18px;
}

.login-card__title {
    text-align: center;
    color: var(--tr-navy);
    font-size: 1.35rem;
    font-weight: 700;
    margin: 0 0 4px;
    letter-spacing: 0.02em;
}

.login-card__subtitle {
    text-align: center;
    color: var(--tr-navy-light);
    font-size: 0.92rem;
    margin: 0 0 28px;
}

.login-field {
    margin-bottom: 18px;
}

.login-field label {
    display: block;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--tr-navy);
    margin-bottom: 6px;
}

.login-field input {
    width: 100%;
    box-sizing: border-box;
    padding: 11px 14px;
    border: 1.5px solid var(--tr-warm-gray);
    border-radius: 10px;
    font-size: 0.95rem;
    color: var(--tr-navy);
    background: #fbfcfc;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.login-field input:focus {
    outline: none;
    border-color: var(--tr-sage);
    box-shadow: 0 0 0 3px rgba(168, 196, 190, 0.4);
    background: #ffffff;
}

.login-submit {
    width: 100%;
    padding: 12px 14px;
    border: none;
    border-radius: 10px;
    background: var(--tr-navy);
    color: #ffffff;
    font-size: 0.98rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    cursor: pointer;
    transition: background 0.15s ease, transform 0.05s ease;
}

.login-submit:hover {
    background: var(--tr-navy-light);
}

.login-submit:active {
    transform: translateY(1px);
}

.login-alert {
    margin: 0 0 18px;
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 0.85rem;
}

.login-alert--danger {
    background: #fdecea;
    color: #8a2a20;
    border: 1px solid #f3c6c1;
}

.login-alert--success {
    background: #eaf3ee;
    color: var(--tr-navy);
    border: 1px solid var(--tr-sage);
}

.login-footer {
    text-align: center;
    margin-top: 22px;
    font-size: 0.72rem;
    color: rgba(255, 255, 255, 0.65);
    position: relative;
    z-index: 1;
}