@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
    --primary: #0ea5e9;
    --primary-hover: #0284c7;
    --secondary: #22c55e;
    --secondary-hover: #16a34a;
    --dark: #0f172a;
    --light: #f8fafc;
    --gray: #64748b;
    --white: #ffffff;
    --max-width: 1200px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background-color: var(--white);
    overflow-x: hidden;
}

/* Layout */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: 6rem 0;
}

/* Typography */
h1 {
    font-size: 3.5rem;
    line-height: 1.1;
    font-weight: 800;
    letter-spacing: -0.025em;
    margin-bottom: 1.5rem;
}

h2 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 3rem;
    text-align: center;
}

p {
    font-size: 1.125rem;
    color: var(--gray);
    margin-bottom: 2rem;
}

/* Navigation — sticky so it reserves space and hero is never covered */
nav {
    position: sticky;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    border-bottom: 1px solid #eee;
}

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

.nav-logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    transition: var(--transition);
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    border-radius: 0.5rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(79, 70, 229, 0.4);
}

.btn-secondary {
    background: var(--secondary);
    color: var(--white);
}

.btn-secondary:hover {
    background: var(--secondary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(16, 185, 129, 0.4);
}

/* Hero — nav sticky, contenido siempre visible y legible */
.hero {
    padding-top: 4rem;
    padding-bottom: 6rem;
    min-height: 50vh;
    background: radial-gradient(circle at top right, #eef2ff 0%, #ffffff 50%);
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

/* Colores explícitos para que el hero siempre se vea */
.hero h1 {
    color: #0f172a;
    margin-top: 0.5rem;
}

.hero .hero-content > p {
    color: #334155;
}

.hero .stat-label {
    color: #64748b;
}

.hero .trust-stats {
    margin-top: 2rem;
}

.badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: #e0e7ff;
    color: var(--primary);
    font-weight: 600;
    border-radius: 2rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

/* Features */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    padding: 2.5rem;
    background: var(--white);
    border: 1px solid #f3f4f6;
    border-radius: 1rem;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.05);
    border-color: var(--primary);
}

.feature-icon {
    width: 3rem;
    height: 3rem;
    background: #eef2ff;
    color: var(--primary);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

/* Call to Action (ML & CFDI) */
.highlight-section {
    background: var(--dark);
    color: var(--white);
    border-radius: 2rem;
    padding: 4rem;
    display: flex;
    align-items: center;
    gap: 4rem;
    margin-bottom: 4rem;
}

.highlight-content {
    flex: 1;
}

.highlight-section h2 {
    text-align: left;
    margin-bottom: 1rem;
}

.highlight-section p {
    color: #9ca3af;
}

/* Reviews */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
}

.review-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 1.5rem;
    border: 1px solid #f3f4f6;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.review-stars {
    color: #facc15;
    margin-bottom: 1rem;
    display: flex;
    gap: 0.25rem;
}

.review-text {
    font-size: 1rem;
    font-style: italic;
    color: var(--dark);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.review-author {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.author-info h4 {
    font-size: 0.9375rem;
    font-weight: 700;
}

.author-info p {
    font-size: 0.8125rem;
    margin-bottom: 0;
    color: var(--gray);
}

/* Modules flow diagram */
.modules-diagram {
    max-width: 560px;
    margin: 0 auto;
}

.modules-diagram-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
}

.module-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    width: 100%;
}

.module-row-catalog {
    gap: 2rem;
}

.module-node {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-width: 140px;
    padding: 1.25rem 1.5rem;
    background: var(--white);
    border: 2px solid var(--primary);
    border-radius: 12px;
    box-shadow: 0 4px 14px rgba(14, 165, 233, 0.12);
    transition: var(--transition);
}

.module-node:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(14, 165, 233, 0.18);
}

.module-node-center {
    min-width: 180px;
}

.module-node-final {
    border-color: var(--secondary);
    box-shadow: 0 4px 14px rgba(34, 197, 94, 0.12);
}

.module-node-final:hover {
    box-shadow: 0 8px 24px rgba(34, 197, 94, 0.18);
}

.module-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
    color: white;
    border-radius: 10px;
    font-size: 1.35rem;
    margin-bottom: 0.75rem;
}

.module-node-final .module-icon {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-hover) 100%);
}

.module-label {
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--dark);
    text-align: center;
}

.module-connector {
    color: var(--primary);
    opacity: 0.6;
    margin: -2px 0;
}

.module-connector svg {
    width: 32px;
    height: 20px;
    display: block;
}

.modules-legend {
    margin-top: 2.5rem;
    padding: 1.25rem 1.5rem;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 12px;
    border-left: 4px solid var(--primary);
}

.modules-legend p {
    margin: 0;
    font-size: 0.9375rem;
    color: var(--gray);
    line-height: 1.6;
}

/* 3D Diagram - Apple/modern startup style */
.modules-3d-section {
    background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 50%, #e2e8f0 100%);
    padding: 5rem 0;
}

.modules-3d-section h2 {
    margin-bottom: 1rem;
}

.modules-3d-subtitle {
    text-align: center;
    max-width: 640px;
    margin: -1.5rem auto 3rem;
    color: var(--gray);
}

.modules-3d-wrapper {
    position: relative;
    max-width: 640px;
    margin: 0 auto;
    border-radius: 24px;
    overflow: hidden;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.08), 0 0 0 1px rgba(0, 0, 0, 0.04);
}

.modules-3d-canvas {
    width: 100%;
    height: 720px;
    background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
}

.modules-3d-labels {
    position: absolute;
    inset: 0;
    pointer-events: none;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: 1fr 1fr 1fr 1fr 1fr;
    padding: 2rem;
}

.module-3d-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.8125rem;
    color: var(--dark);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
    align-self: center;
    justify-self: center;
}

.module-3d-label i {
    font-size: 1.25rem;
    color: var(--primary);
}

.module-3d-label[data-pos="top-left"] { grid-column: 1; grid-row: 1; }
.module-3d-label[data-pos="top-right"] { grid-column: 3; grid-row: 1; }
.module-3d-label[data-pos="center"] { grid-column: 2; grid-row: 2; }
.module-3d-label[data-pos="mid"] { grid-column: 2; grid-row: 3; }
.module-3d-label[data-pos="low"] { grid-column: 2; grid-row: 4; }
.module-3d-label[data-pos="bottom"] { grid-column: 2; grid-row: 5; }

.module-3d-label-final {
    background: rgba(34, 197, 94, 0.12);
}

.module-3d-label-final i {
    color: var(--secondary);
}

.modules-3d-hint {
    position: absolute;
    bottom: 5.5rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(0, 0, 0, 0.5);
    color: white;
    font-size: 0.8125rem;
    font-weight: 500;
    border-radius: 2rem;
    pointer-events: none;
    z-index: 2;
}

.modules-3d-hint i {
    opacity: 0.9;
}

.modules-3d-wrapper .modules-legend {
    margin: 0;
    border-radius: 0;
}

.modules-3d-fallback {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 3rem 2rem;
    background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
}

.module-fallback-row {
    display: flex;
    gap: 2rem;
    justify-content: center;
}

.module-fallback-row span {
    padding: 0.5rem 1rem;
    background: white;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.875rem;
}

.module-fallback-arrow {
    color: var(--primary);
    font-size: 1.25rem;
}

/* Responsive */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    .nav-links {
        display: none;
    }

    .highlight-section {
        flex-direction: column;
        padding: 2rem;
        text-align: center;
    }

    .highlight-section h2 {
        text-align: center;
    }

    .modules-diagram {
        max-width: 100%;
    }

    .module-row-catalog {
        flex-direction: row;
        gap: 1rem;
    }

    .module-node {
        min-width: 120px;
        padding: 1rem 1rem;
    }

    .module-node-center {
        min-width: 160px;
    }

    .module-icon {
        width: 40px;
        height: 40px;
        font-size: 1.1rem;
    }

    .module-label {
        font-size: 0.8125rem;
    }

    .modules-3d-canvas {
        height: 560px;
    }

    .modules-3d-hint {
        bottom: 7rem;
        font-size: 0.75rem;
        padding: 0.4rem 0.85rem;
    }

    .modules-3d-labels {
        padding: 1rem;
    }

    .module-3d-label {
        font-size: 0.75rem;
        padding: 0.5rem 0.75rem;
    }
}