:root {
    --primary: #1e293b;
    --secondary: #f8fafc;
    --accent: #0f172a;
    --surface: #ffffff;
    --border: #e2e8f0;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --success: #059669;
    --error: #dc2626;
    --radius: 16px;
}

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

body {
    font-family: 'Inter', system-ui, sans-serif;
    /* Nuevo fondo inspirado en texturas elegantes y colores sofisticados */
    background:
        radial-gradient(circle at 25% 25%, rgba(30, 41, 59, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(15, 23, 42, 0.08) 0%, transparent 50%),
        linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 25%, #cbd5e1 50%, #e2e8f0 75%, #f8fafc 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

/* Elementos decorativos de fondo mejorados */
body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* Efecto de ondas sutiles inspirado en texturas de agua */
    background-image:
        radial-gradient(circle at 20% 30%, rgba(30, 41, 59, 0.03) 0%, transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(15, 23, 42, 0.04) 0%, transparent 40%),
        radial-gradient(circle at 40% 80%, rgba(30, 41, 59, 0.02) 0%, transparent 50%);
    animation: gentleWave 25s ease-in-out infinite;
    z-index: 0;
}

body::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* Capa adicional con efecto de textura sutil */
    background:
        linear-gradient(45deg, transparent 48%, rgba(30, 41, 59, 0.01) 49%, rgba(30, 41, 59, 0.01) 51%, transparent 52%),
        linear-gradient(-45deg, transparent 48%, rgba(15, 23, 42, 0.01) 49%, rgba(15, 23, 42, 0.01) 51%, transparent 52%);
    background-size: 120px 120px;
    animation: subtleShift 30s linear infinite;
    z-index: 1;
}

/* Nueva animación más suave y elegante */
@keyframes gentleWave {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
        opacity: 1;
    }

    25% {
        transform: translate(20px, -15px) scale(1.02);
        opacity: 0.8;
    }

    50% {
        transform: translate(-10px, 10px) scale(0.98);
        opacity: 0.9;
    }

    75% {
        transform: translate(15px, -5px) scale(1.01);
        opacity: 0.85;
    }
}

/* Animación adicional para la textura */
@keyframes subtleShift {
    0% {
        transform: translateX(0) translateY(0);
    }

    25% {
        transform: translateX(10px) translateY(-10px);
    }

    50% {
        transform: translateX(-5px) translateY(5px);
    }

    75% {
        transform: translateX(8px) translateY(-3px);
    }

    100% {
        transform: translateX(0) translateY(0);
    }
}

/* Patrón geométrico mejorado */
.geometric-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* Patrón más sofisticado con múltiples capas */
    opacity: 0.015;
    background-image:
        linear-gradient(30deg, var(--primary) 12%, transparent 12.5%, transparent 87%, var(--primary) 87.5%, var(--primary)),
        linear-gradient(150deg, var(--primary) 12%, transparent 12.5%, transparent 87%, var(--primary) 87.5%, var(--primary)),
        linear-gradient(30deg, var(--primary) 12%, transparent 12.5%, transparent 87%, var(--primary) 87.5%, var(--primary)),
        linear-gradient(150deg, var(--primary) 12%, transparent 12.5%, transparent 87%, var(--primary) 87.5%, var(--primary));
    background-size: 80px 140px, 80px 140px, 80px 140px, 80px 140px;
    background-position: 0 0, 0 0, 40px 70px, 40px 70px;
    z-index: 2;
    animation: patternFloat 40s ease-in-out infinite;
}

/* Animación para el patrón geométrico */
@keyframes patternFloat {

    0%,
    100% {
        transform: translateY(0) rotate(0deg);
    }

    50% {
        transform: translateY(-10px) rotate(0.5deg);
    }
}

.login-container {
    position: relative;
    z-index: 10;
    width: 100%;
    max-width: 480px;
    padding: 20px;
}

.login-card {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow:
        0 20px 25px -5px rgba(0, 0, 0, 0.1),
        0 10px 10px -5px rgba(0, 0, 0, 0.04);
    padding: 48px 40px;
    position: relative;
    overflow: hidden;
}

.login-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
}

.login-header {
    text-align: center;
    margin-bottom: 40px;
}

.institute-logo {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.institute-logo::before {
    content: '';
    position: absolute;
    inset: 2px;
    background: var(--surface);
    border-radius: 18px;
}

.institute-logo i {
    font-size: 32px;
    color: var(--primary);
    position: relative;
    z-index: 1;
}

.login-title {
    font-family: 'Playfair Display', serif;
    font-size: 28px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.login-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    font-weight: 400;
}

.form-group {
    margin-bottom: 24px;
}

.form-label {
    display: block;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
    font-size: 14px;
    letter-spacing: 0.025em;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--secondary);
    border: 2px solid var(--border);
    border-radius: 12px;
    transition: all 0.3s ease;
    overflow: hidden;
}

.input-wrapper:focus-within {
    border-color: var(--primary);
    background: var(--surface);
    box-shadow: 0 0 0 3px rgba(30, 41, 59, 0.1);
}

.input-icon {
    padding: 16px;
    color: var(--text-secondary);
    background: rgba(30, 41, 59, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 52px;
}

.form-input {
    flex: 1;
    border: none;
    outline: none;
    padding: 16px;
    font-size: 15px;
    color: var(--text-primary);
    background: transparent;
    font-weight: 400;
}

.form-input::placeholder {
    color: var(--text-secondary);
}

.toggle-password {
    padding: 16px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 52px;
}

.toggle-password:hover {
    color: var(--primary);
}

.login-button {
    width: 100%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: white;
    border: none;
    border-radius: 12px;
    padding: 16px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    margin-top: 8px;
}

.login-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.login-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(30, 41, 59, 0.2);
}

.login-button:hover::before {
    left: 100%;
}

.login-button:active {
    transform: translateY(0);
}

.alert {
    background: #fef2f2;
    color: var(--error);
    border: 1px solid #fecaca;
    border-radius: 12px;
    padding: 16px;
    font-size: 14px;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.alert i {
    color: var(--error);
}

.divider {
    height: 1px;
    background: var(--border);
    margin: 32px 0;
    position: relative;
}

.divider::after {
    content: 'ACCESO INSTITUCIONAL';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--surface);
    padding: 0 16px;
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 500;
    letter-spacing: 0.1em;
    text-align: center;
}

.footer-text {
    text-align: center;
    margin-top: 32px;
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Animaciones de entrada */
.login-card {
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.form-group {
    animation: fadeIn 0.6s ease-out forwards;
    opacity: 0;
}

.form-group:nth-child(1) {
    animation-delay: 0.1s;
}

.form-group:nth-child(2) {
    animation-delay: 0.2s;
}

.form-group:nth-child(3) {
    animation-delay: 0.3s;
}

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

/* Responsive */
@media (max-width: 640px) {
    .login-card {
        padding: 32px 24px;
        margin: 16px;
    }

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