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

body {
    font-family: 'Inter', sans-serif;
    color: #444;
    line-height: 1.8;
    background: #fff;
    font-weight: 300;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

/* Header */
header {
    padding: 40px 0;
    position: fixed;
    width: 100%;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid rgba(21, 64, 120, 0.1);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: 20px;
    font-weight: 600;
    color: #154078;
    letter-spacing: -0.5px;
}

.logo img {
    height: 40px;
    opacity: 0.9;
}

.nav-links {
    display: flex;
    gap: 50px;
    list-style: none;
}

.nav-links a {
    color: #666;
    text-decoration: none;
    font-weight: 400;
    font-size: 14px;
    letter-spacing: 0.5px;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #154078;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 100px;
    background: linear-gradient(180deg, #fff 0%, #fafbfc 100%);
}

.hero-content {
    max-width: 900px;
}

.hero h1 {
    font-size: 72px;
    font-weight: 300;
    margin-bottom: 40px;
    line-height: 1.1;
    color: #154078;
    letter-spacing: -2px;
}

.hero h1 strong {
    font-weight: 600;
}

.hero .subtitle {
    font-size: 24px;
    margin-bottom: 60px;
    color: #666;
    font-weight: 300;
    line-height: 1.6;
}

.cta-button {
    background: transparent;
    color: #154078;
    padding: 18px 50px;
    border: 2px solid #154078;
    border-radius: 0;
    text-decoration: none;
    font-weight: 400;
    transition: all 0.3s;
    display: inline-block;
    font-size: 14px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.cta-button:hover {
    background: #154078;
    color: white;
}

/* Section Styles */
section {
    padding: 150px 0;
}

.section-title {
    font-size: 48px;
    color: #154078;
    margin-bottom: 80px;
    font-weight: 300;
    letter-spacing: -1px;
    line-height: 1.2;
}

.section-title strong {
    font-weight: 600;
}

/* Simple Grid */
.simple-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 60px;
    margin-top: 80px;
}

.simple-card h3 {
    color: #154078;
    margin-bottom: 20px;
    font-size: 20px;
    font-weight: 400;
}

.simple-card p {
    color: #666;
    font-size: 16px;
    line-height: 1.8;
}

/* Services */
.services {
    background: #fafbfc;
}

.service-item {
    border-bottom: 1px solid rgba(21, 64, 120, 0.1);
    padding: 60px 0;
}

.service-item:last-child {
    border-bottom: none;
}

.service-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 30px;
}

.service-item h3 {
    font-size: 32px;
    color: #154078;
    font-weight: 300;
    letter-spacing: -0.5px;
    max-width: 500px;
}

.service-number {
    font-size: 14px;
    color: #999;
    letter-spacing: 2px;
}

.service-item p {
    color: #666;
    font-size: 18px;
    max-width: 700px;
    margin-bottom: 30px;
}

.service-item ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.service-item li {
    color: #999;
    font-size: 14px;
    padding-right: 30px;
    border-right: 1px solid rgba(21, 64, 120, 0.1);
}

.service-item li:last-child {
    border-right: none;
}

/* Examples */
.examples-list {
    display: flex;
    flex-direction: column;
    gap: 80px;
    margin-top: 80px;
}

.example-item {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 80px;
    align-items: center;
}

.example-item h3 {
    font-size: 28px;
    color: #154078;
    font-weight: 300;
    letter-spacing: -0.5px;
}

.example-item p {
    font-size: 18px;
    color: #666;
    line-height: 1.8;
}

/* About */
.about {
    background: #fafbfc;
}

.about-content {
    max-width: 800px;
}

.about-content p {
    font-size: 20px;
    line-height: 1.9;
    margin-bottom: 30px;
    color: #666;
}

.about-content strong {
    color: #154078;
    font-weight: 400;
}

/* Process */
.process-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 60px 100px;
    margin-top: 80px;
}

.process-item {
    display: flex;
    gap: 30px;
}

.process-number {
    font-size: 48px;
    color: rgba(21, 64, 120, 0.2);
    font-weight: 300;
    line-height: 1;
}

.process-item h3 {
    font-size: 22px;
    color: #154078;
    margin-bottom: 15px;
    font-weight: 400;
}

.process-item p {
    color: #666;
    font-size: 16px;
}

/* FAQ */
.faq {
    background: #fafbfc;
}

.faq-container {
    max-width: 900px;
}

.faq-item {
    border-bottom: 1px solid rgba(21, 64, 120, 0.1);
    padding: 40px 0;
    cursor: pointer;
}

.faq-question {
    color: #154078;
    font-weight: 400;
    font-size: 22px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    letter-spacing: -0.5px;
}

.faq-answer {
    margin-top: 20px;
    display: none;
    color: #666;
    font-size: 16px;
    line-height: 1.8;
    padding-right: 50px;
}

.faq-item.active .faq-answer {
    display: block;
}

.faq-toggle {
    font-size: 28px;
    color: #154078;
    font-weight: 300;
}

/* Contact */
.contact-content {
    max-width: 700px;
    margin: 80px auto 0;
}

.form-group {
    margin-bottom: 40px;
}

.form-group label {
    display: block;
    margin-bottom: 15px;
    color: #154078;
    font-weight: 400;
    font-size: 14px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 20px 0;
    border: none;
    border-bottom: 1px solid rgba(21, 64, 120, 0.2);
    font-family: 'Inter', sans-serif;
    font-size: 18px;
    background: transparent;
    transition: border-color 0.3s;
    font-weight: 300;
    color: #444;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #154078;
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.form-button {
    width: auto;
    padding: 18px 60px;
    margin-top: 20px;
}

/* Footer */
footer {
    background: #fafbfc;
    color: #666;
    padding: 80px 0 30px;
    border-top: 1px solid rgba(21, 64, 120, 0.1);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 600;
    color: #154078;
    margin-bottom: 20px;
}

.footer-logo img {
    height: 35px;
}

.footer-description {
    font-size: 14px;
    line-height: 1.8;
    color: #666;
    margin-bottom: 25px;
    max-width: 350px;
}

.footer-social {
    display: flex;
    gap: 15px;
}

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: #154078;
    text-decoration: none;
    transition: all 0.3s;
}

.social-link:hover {
    opacity: 0.7;
    transform: translateY(-2px);
}

.footer-section h4 {
    color: #154078;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 20px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: #666;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: #154078;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(21, 64, 120, 0.1);
    font-size: 14px;
    color: #999;
}

/* Responsive  */
@media (max-width: 1024px) {
    .hero h1 {
        font-size: 52px;
    }

    .simple-grid,
    .process-list {
        grid-template-columns: 1fr;
    }

    .example-item {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }

    header {
        padding: 20px 0;
    }

    .nav-links {
        display: none;
    }

    .hero h1 {
        font-size: 36px;
    }

    .hero .subtitle {
        font-size: 18px;
    }

    .section-title {
        font-size: 32px;
    }

    section {
        padding: 80px 0;
    }

    .service-header {
        flex-direction: column;
        gap: 10px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

:root {
    /* Colores base (adaptados a Efficient AI Lab) */
    --chat--color-primary: #154078;          /* Azul marca: header, botón, burbujas usuario */
    --chat--color-primary-shade-50: #123667; /* Hover */
    --chat--color-primary-shade-100: #0e2a55;/* Active */

    --chat--color-secondary: #0f172a;        /* Azul muy oscuro / casi negro para detalles */
    --chat--color-secondary-shade-50: #111827;

    --chat--color-white: #ffffff;
    --chat--color-light: #f3f4f6;            /* Fondo suave (similar secciones claras web) */
    --chat--color-light-shade-50: #e5e7eb;
    --chat--color-light-shade-100: #d1d5db;
    --chat--color-medium: #9ca3af;
    --chat--color-dark: #020617;             /* Texto principal oscuro */
    --chat--color-disabled: #9ca3af;
    --chat--color-typing: #4b5563;

    /* Espacios / bordes (más redondeado, estilo moderno) */
    --chat--spacing: 0.9rem;
    --chat--border-radius: 0.75rem;

    /* Tamaño ventana (puedes ajustar si lo ves grande/pequeño) */
    --chat--window--width: 360px;
    --chat--window--height: 560px;

    /* Header del chat: barra superior azul, texto blanco */
    --chat--header-height: auto;
    --chat--header--padding: 1rem 1.25rem;
    --chat--header--background: var(--chat--color-primary);
    --chat--header--color: var(--chat--color-white);
    --chat--heading--font-size: 1.05rem;
    --chat--subtitle--font-size: 0.85rem;
    --chat--subtitle--line-height: 1.5;

    /* Mensajes */
    --chat--message--font-size: 0.95rem;
    --chat--message--padding: 0.75rem 0.9rem;
    --chat--message--border-radius: 0.75rem;
    --chat--message-line-height: 1.6;

    /* Burbujas del bot: fondo blanco, borde suave gris */
    --chat--message--bot--background: #ffffff;
    --chat--message--bot--color: #0f172a;
    --chat--message--bot--border: 1px solid #e5e7eb;

    /* Burbujas del usuario: azul marca + texto blanco */
    --chat--message--user--background: var(--chat--color-primary);
    --chat--message--user--color: #ffffff;
    --chat--message--user--border: none;

    /* Código / bloques pre */
    --chat--message--pre--background: rgba(15, 23, 42, 0.04);

    /* Textarea */
    --chat--textarea--height: 52px;

    /* Botón flotante (toggle) del chat */
    --chat--toggle--background: var(--chat--color-primary);
    --chat--toggle--hover--background: var(--chat--color-primary-shade-50);
    --chat--toggle--active--background: var(--chat--color-primary-shade-100);
    --chat--toggle--color: var(--chat--color-white);
    --chat--toggle--size: 64px;
  }