:root {
    --gb-black: #141210;
    --gb-black-soft: #211e1a;
    --gb-gold: #a9824f;
    --gb-gold-soft: #d9c19a;
    --gb-gold-light: rgba(169, 130, 79, 0.14);
    --gb-charcoal: #26221d;
    --gb-muted: #726b60;
    --gb-border: #e5e0d8;
    --gb-danger: #dc2626;
    --gb-success: #16a34a;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    position: relative;
    overflow-x: hidden;
    background:
        radial-gradient(circle at 30% 25%, rgba(169, 130, 79, 0.14), transparent 45%),
        linear-gradient(155deg, var(--gb-black) 0%, var(--gb-black-soft) 100%);
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(135deg, rgba(255,255,255,0.02) 25%, transparent 25%),
        linear-gradient(-135deg, rgba(255,255,255,0.02) 25%, transparent 25%);
    background-size: 30px 30px;
    z-index: 0;
}

body::after {
    content: '';
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 720px;
    height: 720px;
    background-image: url('/Content/logo-gamba.png');
    background-size: 152% 141%;
    background-position: 50% 51%;
    background-repeat: no-repeat;
    border-radius: 50%;
    opacity: 0.05;
    z-index: 0;
    pointer-events: none;
}

.tarjeta {
    position: relative;
    z-index: 1;
    background: rgba(255, 255, 255, 0.98);
    border-radius: 20px;
    width: 100%;
    max-width: 400px;
    overflow: hidden;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.4);
    animation: gbFadeUp 0.4s ease-out;
}

@keyframes gbFadeUp {
    from { opacity: 0; transform: translateY(14px); }
    to { opacity: 1; transform: translateY(0); }
}

.gb-logo-mark {
    background-image: url('/Content/logo-gamba.png');
    background-size: 152% 141%;
    background-position: 50% 51%;
    background-repeat: no-repeat;
    border-radius: 50%;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
}

.marca {
    background: linear-gradient(135deg, var(--gb-black) 0%, var(--gb-black-soft) 100%);
    text-align: center;
    padding: 2rem 2rem 1.5rem;
    position: relative;
}

.marca::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: 0;
    transform: translateX(-50%);
    width: 56px;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--gb-gold), transparent);
}

.marca-icon {
    width: 76px;
    height: 76px;
    margin: 0 auto 12px;
}

.marca-sub {
    font-size: 10px;
    color: var(--gb-gold-soft);
    letter-spacing: 0.22em;
    text-transform: uppercase;
    margin-top: 4px;
}

.pestanas {
    display: flex;
    background: #f7f5f2;
    border-bottom: 1px solid var(--gb-border);
}

.pestana-btn {
    flex: 1;
    padding: 15px;
    background: transparent;
    border: none;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    cursor: pointer;
    color: var(--gb-muted);
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
}

.pestana-btn:hover {
    color: var(--gb-charcoal);
}

.pestana-btn.activa {
    color: var(--gb-charcoal);
    background: #fff;
    border-bottom-color: var(--gb-gold);
}

.contenido {
    display: none;
    padding: 1.75rem 2rem 2rem;
}

.contenido.activo {
    display: block;
    animation: gbFadeUp 0.25s ease-out;
}

.campo {
    margin-bottom: 16px;
    position: relative;
}

.campo label {
    display: block;
    font-size: 10.5px;
    color: var(--gb-muted);
    letter-spacing: 1.2px;
    text-transform: uppercase;
    margin-bottom: 7px;
    font-weight: 600;
}

.campo-icono {
    position: relative;
}

.campo-icono i {
    position: absolute;
    left: 13px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gb-muted);
    font-size: 14px;
    pointer-events: none;
}

.campo-toggle {
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gb-muted);
    font-size: 14px;
    cursor: pointer;
    background: none;
    border: none;
    border-radius: 6px;
    z-index: 2;
}

.campo-toggle:hover {
    color: var(--gb-charcoal);
    background: rgba(0, 0, 0, 0.05);
}

.campo input {
    width: 100%;
    background: #fafaf8;
    border: 1.5px solid var(--gb-border);
    border-radius: 10px;
    padding: 11px 14px;
    color: var(--gb-charcoal);
    font-size: 14px;
    outline: none;
    transition: all 0.2s ease;
}

.campo-icono input {
    padding-left: 38px;
}

.campo-icono input.con-toggle {
    padding-right: 42px;
}

.campo input:focus {
    border-color: var(--gb-gold);
    background: #fff;
    box-shadow: 0 0 0 3px var(--gb-gold-light);
}

.campo input::placeholder {
    color: #bbb;
}

.fila-campos {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.btn-enviar {
    width: 100%;
    padding: 13px;
    background: var(--gb-gold);
    color: #fff;
    border: none;
    border-radius: 10px;
    font-size: 11.5px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    cursor: pointer;
    margin-top: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: 0 4px 12px rgba(169, 130, 79, 0.3);
    transition: all 0.2s ease;
}

.btn-enviar:hover {
    background: #8f6c3f;
    transform: translateY(-1px);
    box-shadow: 0 8px 18px rgba(169, 130, 79, 0.38);
}

.olvidaste {
    text-align: right;
    margin-bottom: 14px;
}

.olvidaste a {
    font-size: 11px;
    color: var(--gb-muted);
    text-decoration: none;
}

.olvidaste a:hover {
    color: var(--gb-gold);
}

.pie {
    background: #f7f5f2;
    border-top: 1px solid var(--gb-border);
    padding: 12px;
    text-align: center;
    font-size: 10px;
    color: var(--gb-muted);
    letter-spacing: 1px;
    text-transform: uppercase;
}

/* Mensajes de estado */
.alerta {
    padding: 11px 14px;
    border-radius: 10px;
    font-size: 12px;
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.alerta-error {
    background: #fdf0f0;
    border: 1px solid #f5c6c6;
    color: #c0392b;
}

.alerta-exito {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    color: #166534;
}

.error-campo {
    font-size: 11px;
    color: var(--gb-danger);
    margin-top: 4px;
    display: block;
}

.campo input.input-error {
    border-color: #e74c3c;
    background: #fff8f8;
}

@media (max-width: 480px) {
    .tarjeta { max-width: 100%; }
    .fila-campos { grid-template-columns: 1fr; gap: 0; }
    .contenido { padding: 1.5rem 1.5rem 1.75rem; }
}