:root {
    --bg-color: #121212;
    --surface-color: #1E1E1E;
    --surface-lighter: #2A2A2A;
    --primary-color: #3B82F6;
    --primary-gradient: linear-gradient(90deg, #3B82F6, #9333EA);
    --text-color: #E0E0E0;
    --text-muted: #8A8A8A;
    --border-color: #333333;
    --google-blue: #4285F4;
    --google-blue-hover: #357ae8;
    --pro-color: #9333ea;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow-x: hidden;
}

.background-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-image: 
        linear-gradient(to right, var(--border-color) 1px, transparent 1px),
        linear-gradient(to bottom, var(--border-color) 1px, transparent 1px);
    background-size: 40px 40px;
    opacity: 0.1;
    z-index: -1;
}

.navbar {
    width: 100%;
    padding: 20px 0;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    background-color: rgba(18, 18, 18, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-color);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 24px;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--text-color);
}

.auth-button-container a.profile-nav-link {
    margin-right: 12px;
}

.cta-button {
    text-decoration: none;
    padding: 10px 18px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
    display: inline-block;
    border: 1px solid transparent;
    cursor: pointer;
}

.cta-button.primary {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}
.cta-button.primary:hover:not(.disabled) {
    background-color: #2563EB;
    border-color: #2563EB;
}
.cta-button.primary.disabled {
    background-color: var(--surface-lighter);
    border-color: var(--border-color);
    color: var(--text-muted);
    cursor: not-allowed;
    opacity: 0.7;
}

.cta-button.secondary {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
}
.cta-button.secondary:hover:not(.disabled) {
    background-color: var(--surface-lighter);
}
.cta-button.secondary.disabled {
    background-color: var(--surface-color);
    border-color: var(--border-color);
    color: var(--text-muted);
    cursor: not-allowed;
    opacity: 0.7;
}


.cta-button.loading {
    background-color: var(--surface-color);
    color: var(--text-muted);
    cursor: default;
}

.hero-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 70vh; /* Reducido un poco para que se vea el demo */
    padding: 120px 24px 60px;
    text-align: center;
}

.hero-section h1 {
    font-size: 72px;
    font-weight: 900;
    letter-spacing: -2px;
    line-height: 1.1;
    max-width: 800px;
}

.gradient-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 18px;
    color: var(--text-muted);
    max-width: 500px;
    margin: 24px 0 32px;
    line-height: 1.6;
}

.main-cta-container .cta-button {
    padding: 14px 32px;
    font-size: 16px;
}

.main-cta-container .google-login-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: auto;
    padding: 12px 28px;
    border: none;
    background-color: var(--google-blue);
    color: white;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}
.main-cta-container .google-login-btn:hover {
    background-color: var(--google-blue-hover);
}
.main-cta-container .google-login-btn svg {
    width: 20px;
    height: 20px;
    background-color: white;
    border-radius: 50%;
    padding: 2px;
}

/* === ESTILOS DEL DEMO CHAT === */
.demo-section {
    text-align: center;
    padding-top: 0;
}
.demo-subtitle {
    color: var(--text-muted);
    margin-bottom: 32px;
    font-size: 14px;
}
.demo-chat-container {
    max-width: 700px;
    margin: 0 auto;
    height: 400px;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}
.demo-chat-messages {
    flex-grow: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    text-align: left;
}
.demo-chat-form {
    display: flex;
    padding: 12px;
    background-color: var(--surface-lighter);
    border-top: 1px solid var(--border-color);
    gap: 10px;
}
#demo-input {
    flex-grow: 1;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-color);
    border-radius: 20px;
    padding: 10px 16px;
    font-size: 14px;
    outline: none;
}
#demo-input:focus {
    border-color: var(--primary-color);
}
.demo-chat-form button {
    background-color: var(--primary-color);
    border: none;
    color: white;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color 0.2s;
}
.demo-chat-form button:hover {
    background-color: #2563EB;
}
.demo-chat-form button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Estilos de mensaje dentro del demo (similar a app.js) */
.message {
    display: inline-block;
    max-width: 85%;
    padding: 10px 14px;
    border-radius: 16px;
    font-size: 14px;
    line-height: 1.5;
    word-wrap: break-word;
}
.message.ai {
    align-self: flex-start;
    background-color: var(--surface-lighter);
    border-bottom-left-radius: 4px;
}
.message.user {
    align-self: flex-end;
    background-color: var(--primary-color);
    color: white;
    border-bottom-right-radius: 4px;
}
.message p { margin: 0; }
.message pre {
    background-color: #0d1117;
    padding: 10px;
    border-radius: 6px;
    overflow-x: auto;
    margin: 5px 0 0 0;
}
.message code { font-family: monospace; font-size: 0.9em; }

/* === FIN ESTILOS DEMO === */

.page-section {
    padding: 80px 24px;
    max-width: 1200px;
    margin: 0 auto;
}
.page-section.alt-bg {
    background-color: var(--surface-color);
}

.section-title {
    font-size: 42px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 48px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}
.feature-card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
    transition: transform 0.2s, box-shadow 0.2s;
}
.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}
.feature-card svg {
    width: 40px;
    height: 40px;
    color: var(--primary-color);
    margin-bottom: 16px;
}
.feature-card h3 {
    font-size: 20px;
    margin-bottom: 8px;
}
.feature-card p {
    color: var(--text-muted);
    line-height: 1.6;
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}
.review-card {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
}
.review-card p {
    font-size: 16px;
    line-height: 1.7;
    margin-bottom: 16px;
    font-style: italic;
}
.review-author {
    display: flex;
    align-items: center;
    gap: 12px;
}
.review-author img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}
.review-author span {
    font-weight: 500;
    color: var(--text-color);
}

.pricing-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    max-width: 800px;
    margin: 0 auto;
}
.pricing-plan {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
}
.pricing-plan.featured {
    border-color: var(--primary-color);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.3);
}
.pricing-plan h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
}
.pricing-plan .price {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 8px;
}
.pricing-plan .price span {
    font-size: 16px;
    font-weight: 400;
    color: var(--text-muted);
}
.pricing-plan .description {
    color: var(--text-muted);
    margin-bottom: 24px;
}
.pricing-plan ul {
    list-style: none;
    margin-bottom: 32px;
}
.pricing-plan ul li {
    margin-bottom: 12px;
    color: var(--text-color);
}
.pricing-plan .cta-button {
    width: 100%;
    text-align: center;
}

.footer {
    padding: 40px 24px;
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 14px;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-on-scroll {
    opacity: 0;
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    transform: translateY(20px);
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 48px;
    }
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    .nav-links {
        display: none;
    }
    .auth-button-container a.profile-nav-link {
        display: none;
    }
}