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

body {
    font-family: 'Poppins', sans-serif;
    height: 100vh;
    overflow: hidden;
}

.login-container {
    display: flex;
    height: 100vh;
    position: relative;
}

/* Lado izquierdo - Branding */
.brand-side {
    flex: 1;
    background: linear-gradient(135deg, #4A9FD8 0%, #3A8BC8 50%, #2C5F7F 100%);
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 60px;
    overflow: hidden;
}

/* Patrón de fondo microscópico */
.brand-side::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 25% 35%, rgba(255,255,255,0.06) 2px, transparent 2px),
        radial-gradient(circle at 75% 65%, rgba(255,255,255,0.06) 2px, transparent 2px);
    background-size: 150px 150px, 200px 200px;
    background-position: 0 0, 50px 50px;
}

/* Formas orgánicas de tinción - Sutiles pero visibles */
.stain-shape {
    position: absolute;
    border-radius: 60% 40% 70% 30% / 50% 60% 40% 50%;
    filter: blur(50px);
    mix-blend-mode: soft-light;
    opacity: 0;
    animation: stainFlow 12s ease-in-out infinite;
}

/* Forma 1 - Grande, violeta */
.stain-shape:nth-child(1) {
    width: 550px;
    height: 550px;
    top: 8%;
    left: -3%;
    background: radial-gradient(circle, rgba(180, 100, 230, 0.75), rgba(200, 130, 240, 0.4));
    animation-delay: 0s;
    animation-duration: 14s;
}

/* Forma 2 - Mediana, rosa */
.stain-shape:nth-child(2) {
    width: 500px;
    height: 500px;
    bottom: 12%;
    right: 8%;
    background: radial-gradient(circle, rgba(240, 120, 170, 0.7), rgba(255, 150, 190, 0.4));
    animation-delay: 2s;
    animation-duration: 13s;
}

/* Forma 3 - Grande, violeta-rosa */
.stain-shape:nth-child(3) {
    width: 600px;
    height: 600px;
    top: 42%;
    left: 38%;
    background: radial-gradient(circle, rgba(190, 110, 220, 0.65), rgba(210, 140, 240, 0.35));
    animation-delay: 4s;
    animation-duration: 16s;
}

/* Forma 4 - Mediana, morado */
.stain-shape:nth-child(4) {
    width: 480px;
    height: 480px;
    top: 22%;
    right: 18%;
    background: radial-gradient(circle, rgba(150, 90, 200, 0.75), rgba(170, 110, 220, 0.4));
    animation-delay: 6s;
    animation-duration: 15s;
}

/* Forma 5 - Grande, coral */
.stain-shape:nth-child(5) {
    width: 530px;
    height: 530px;
    bottom: 18%;
    left: 22%;
    background: radial-gradient(circle, rgba(250, 130, 160, 0.65), rgba(255, 160, 180, 0.35));
    animation-delay: 8s;
    animation-duration: 14s;
}

@keyframes stainFlow {
    0% {
        opacity: 0;
        transform: translate(0, 0) scale(0.75) rotate(0deg);
        border-radius: 60% 40% 70% 30% / 50% 60% 40% 50%;
    }
    20% {
        opacity: 0.5;
    }
    40% {
        opacity: 0.8;
        transform: translate(35px, -25px) scale(1.08) rotate(120deg);
        border-radius: 40% 60% 50% 70% / 60% 40% 60% 40%;
    }
    60% {
        opacity: 0.9;
        transform: translate(18px, 30px) scale(1.15) rotate(240deg);
        border-radius: 70% 30% 40% 60% / 40% 70% 50% 60%;
    }
    80% {
        opacity: 0.6;
    }
    100% {
        opacity: 0;
        transform: translate(0, 0) scale(0.75) rotate(360deg);
        border-radius: 60% 40% 70% 30% / 50% 60% 40% 50%;
    }
}

/* Células - MÁS PEQUEÑAS y mejor distribuidas (6 células) */
.cell {
    position: absolute;
    border-radius: 50%;
    /* Simula el citoplasma teñido de Eosina (Rosa/Coral pálido) */
    background: radial-gradient(circle at 28% 28%, rgba(255, 150, 190, 0.45), rgba(255, 180, 210, 0.15));
    border: 2px solid rgba(255,255,255,0.23);
    box-shadow: 0 0 25px rgba(255,255,255,0.18);
    animation: cellPulse 6s ease-in-out infinite;
}

/* Célula 1 - VIOLETA - Arriba izquierda */
.cell:nth-child(6) {
    width: 140px;
    height: 140px;
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.cell:nth-child(6)::before {
    background: radial-gradient(circle, rgba(100, 50, 150, 0.8), rgba(120, 70, 170, 0.5));
    box-shadow: 0 0 18px rgba(160, 95, 210, 0.45);
}

/* Célula 2 - ROSA - Arriba derecha */
.cell:nth-child(7) {
    width: 125px;
    height: 125px;
    top: 18%;
    right: 12%;
    background: radial-gradient(circle at 28% 28%, rgba(240, 120, 170, 0.3), rgba(255, 150, 190, 0.1));
    animation-delay: 1.5s;
}

.cell:nth-child(7)::before {
    background: radial-gradient(circle, rgba(160, 95, 210, 0.75), rgba(140, 80, 190, 0.45));
    box-shadow: 0 0 18px rgba(230, 115, 160, 0.45);
}

/* Célula 3 - VIOLETA - Centro izquierda */
.cell:nth-child(8) {
    width: 130px;
    height: 130px;
    top: 48%;
    left: 15%;
    animation-delay: 3s;
}

.cell:nth-child(8)::before {
    background: radial-gradient(circle, rgba(170, 100, 220, 0.68), rgba(150, 85, 200, 0.38));
    box-shadow: 0 0 18px rgba(170, 100, 220, 0.45);
}

/* Célula 4 - ROSA - Centro derecha */
.cell:nth-child(9) {
    width: 125px;
    height: 125px;
    top: 55%;
    right: 10%;
    animation-delay: 4.5s;
}

.cell:nth-child(9)::before {
    background: radial-gradient(circle, rgba(240, 120, 165, 0.68), rgba(220, 100, 145, 0.38));
    box-shadow: 0 0 18px rgba(240, 120, 165, 0.45);
}

/* Célula 5 - VIOLETA - Abajo izquierda */
.cell:nth-child(10) {
    width: 135px;
    height: 135px;
    bottom: 15%;
    left: 18%;
    animation-delay: 2s;
}

.cell:nth-child(10)::before {
    background: radial-gradient(circle, rgba(155, 90, 205, 0.68), rgba(135, 75, 185, 0.38));
    box-shadow: 0 0 18px rgba(155, 90, 205, 0.45);
}

/* Célula 6 - ROSA - Abajo derecha */
.cell:nth-child(11) {
    width: 115px;
    height: 115px;
    bottom: 22%;
    right: 15%;
    animation-delay: 5s;
}

.cell:nth-child(11)::before {
    background: radial-gradient(circle, rgba(235, 110, 155, 0.68), rgba(215, 90, 135, 0.38));
    box-shadow: 0 0 18px rgba(235, 110, 155, 0.45);
}

@keyframes cellPulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.3;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.46;
    }
}

/* Núcleo celular - Base para todos */
.cell::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 38%;
    height: 38%;
    border-radius: 50%;
    /* Núcleo de color Violeta/Morado, más oscuro */
    background: radial-gradient(circle, rgba(100, 50, 150, 0.8), rgba(120, 70, 170, 0.5));
    box-shadow: 0 0 10px rgba(100, 50, 150, 0.6);
    animation: nucleusGlow 3s ease-in-out infinite;
}

@keyframes nucleusGlow {
    0%, 100% {
        opacity: 0.62;
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        opacity: 0.82;
        transform: translate(-50%, -50%) scale(1.14);
    }
}

/* Partículas flotantes sutiles */
.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.65);
    box-shadow: 0 0 10px rgba(255,255,255,0.5);
    animation: particleFloat 15s linear infinite;
}

.particle:nth-child(12) { top: 20%; left: 30%; animation-delay: 0s; }
.particle:nth-child(13) { top: 60%; left: 70%; animation-delay: 3s; }
.particle:nth-child(14) { top: 80%; left: 20%; animation-delay: 6s; }
.particle:nth-child(15) { top: 40%; left: 80%; animation-delay: 9s; }
.particle:nth-child(16) { top: 70%; left: 45%; animation-delay: 12s; }
.particle:nth-child(17) { top: 30%; left: 60%; animation-delay: 2s; }
.particle:nth-child(18) { top: 50%; left: 25%; animation-delay: 5s; }
.particle:nth-child(19) { top: 65%; left: 85%; animation-delay: 8s; }

@keyframes particleFloat {
    0% {
        transform: translateY(0) translateX(0);
        opacity: 0;
    }
    10% {
        opacity: 0.75;
    }
    90% {
        opacity: 0.55;
    }
    100% {
        transform: translateY(-110px) translateX(50px);
        opacity: 0;
    }
}

.brand-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    animation: fadeInUp 1s ease-out;
    width: 100%;
    max-width: 520px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.logo-card {
    background: white;
    padding: 35px 45px;
    border-radius: 24px;
    box-shadow: 0 25px 70px rgba(0,0,0,0.25), 0 10px 30px rgba(0,0,0,0.15);
    margin-bottom: 45px;
    transition: transform 0.3s ease;
}

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

.logo-card img {
    width: 300px;
    height: auto;
    display: block;
}

.brand-title {
    font-size: 34px;
    font-weight: 600;
    margin-bottom: 18px;
    text-shadow: 0 3px 15px rgba(0,0,0,0.2);
    line-height: 1.3;
}

.brand-subtitle {
    font-size: 17px;
    font-weight: 300;
    line-height: 1.7;
    opacity: 0.97;
    margin: 0 auto 35px;
    max-width: 480px;
}

.brand-link {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    color: white;
    text-decoration: none;
    font-size: 16px;
    font-weight: 600;
    padding: 16px 24px;
    border: none;
    border-radius: 12px;
    transition: all 0.3s ease;
    background: linear-gradient(135deg, #4A9FD8 0%, #5AADE2 100%);
    box-shadow: 0 6px 20px rgba(74, 159, 216, 0.35);
}

.brand-link:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(74, 159, 216, 0.45);
}

.brand-link:active {
    transform: translateY(-1px);
}

.brand-link i {
    font-size: 18px;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Lado derecho - Formulario */
.form-side {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #F6F8FA;
    padding: 60px;
    position: relative;
}

/* Elemento decorativo esquina */
.form-side::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 250px;
    height: 250px;
    background: linear-gradient(135deg, rgba(74, 159, 216, 0.08) 0%, transparent 70%);
    border-radius: 0 0 0 100%;
}

.login-form {
    width: 100%;
    max-width: 520px;
    position: relative;
    z-index: 2;
    background: white;
    padding: 50px 50px;
    border-radius: 24px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.08);
}

.form-header {
    margin-bottom: 40px;
    animation: fadeIn 1s ease-out;
}

.form-header h2 {
    font-size: 28px;
    font-weight: 600;
    color: #2C5F7F;
    margin-bottom: 8px;
}

.form-header p {
    color: #7A7A7A;
    font-size: 15px;
    font-weight: 400;
}

.form-header p span {
    color: #4A9FD8;
    font-weight: 500;
}

.form-group {
    margin-bottom: 28px;
    animation: fadeIn 1s ease-out 0.2s both;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    color: #333;
    font-weight: 500;
    font-size: 14px;
}

.input-wrapper {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: #7A7A7A;
    font-size: 16px;
    transition: color 0.3s ease;
}

.form-group input {
    width: 100%;
    padding: 15px 16px 15px 46px;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    font-size: 15px;
    transition: all 0.3s ease;
    font-family: 'Poppins', sans-serif;
    background: #ffffff;
}

.form-group input:focus {
    outline: none;
    border-color: #4A9FD8;
    box-shadow: 0 0 0 4px rgba(74, 159, 216, 0.12);
}

.form-group input:focus + .input-icon {
    color: #4A9FD8;
}

.form-group input::placeholder {
    color: #aaa;
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
    animation: fadeIn 1s ease-out 0.3s both;
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 9px;
}

.remember-me input[type="checkbox"] {
    width: 19px;
    height: 19px;
    cursor: pointer;
    accent-color: #4A9FD8;
}

.remember-me label {
    font-size: 14px;
    color: #666;
    cursor: pointer;
    user-select: none;
}

.forgot-password {
    font-size: 14px;
    color: #4A9FD8;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.forgot-password::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: #4A9FD8;
    transition: width 0.3s ease;
}

.forgot-password:hover::after {
    width: 100%;
}

.forgot-password:hover {
    color: #3A8BC8;
}

.submit-btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #4A9FD8 0%, #5AADE2 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 6px 20px rgba(74, 159, 216, 0.35);
    animation: fadeIn 1s ease-out 0.4s both;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.submit-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(74, 159, 216, 0.45);
}

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

.submit-btn i {
    font-size: 18px;
}

.footer-info {
    margin-top: 40px;
    text-align: center;
    animation: fadeIn 1s ease-out 0.5s both;
}

.footer-info p {
    color: #999;
    font-size: 13px;
    margin-bottom: 8px;
}

.footer-divider {
    width: 60px;
    height: 2px;
    background: linear-gradient(to right, #4A9FD8, #2C5F7F);
    margin: 12px auto;
}

.powered-by {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    color: #7A7A7A;
    font-size: 12px;
    flex-wrap: wrap;
}

.powered-by strong {
    color: #4A9FD8;
    font-weight: 600;
}

.powered-by a {
    color: inherit;
    text-decoration: none;
    transition: color 0.3s ease;
}

.powered-by a:hover {
    color: #3A8BC8;
}

.dna-icon {
    color: #4A9FD8;
    font-size: 14px;
    margin-left: 4px;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Responsive */
@media (max-width: 1024px) {
    .brand-side {
        padding: 40px 30px;
    }
    
    .form-side {
        padding: 40px 30px;
    }

    .login-form {
        padding: 40px 35px;
    }

    .brand-title {
        font-size: 30px;
    }

    .brand-subtitle {
        font-size: 15px;
    }
}

@media (max-width: 768px) {
    .login-container {
        flex-direction: column;
    }

    .brand-side {
        flex: 0 0 auto;
        padding: 40px 25px;
        min-height: 380px;
    }

    .brand-content {
        max-width: 100%;
    }

    .logo-card {
        padding: 25px 35px;
        margin-bottom: 30px;
    }

    .logo-card img {
        width: 220px;
    }

    .brand-title {
        font-size: 24px;
    }

    .brand-subtitle {
        font-size: 14px;
        margin-bottom: 25px;
    }

    .cell, .stain-shape, .particle {
        display: none;
    }

    .form-side {
        flex: 1;
        padding: 30px 20px;
        background: white;
    }

    .form-side::before {
        width: 150px;
        height: 150px;
    }

    .login-form {
        max-width: 100%;
        padding: 30px 25px;
        box-shadow: none;
        border-top: 3px solid #4A9FD8;
    }

    .form-header h2 {
        font-size: 24px;
    }

    .form-options {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }
}