/* ========================================
   Modern FreeDS Landing Page CSS
   Ultra-modern design with vibrant colors
   ======================================== */

/* CSS Variables */
:root {
    /* Colors - Vibrant Palette */
    --primary: #0066FF;
    --primary-light: #3D8BFF;
    --primary-dark: #0052CC;
    --secondary: #8B5CF6;
    --secondary-light: #A78BFA;
    --accent: #06B6D4;
    --success: #10B981;
    --warning: #F59E0B;
    
    /* Neutrals */
    --dark: #0F172A;
    --dark-lighter: #1E293B;
    --gray: #64748B;
    --gray-light: #CBD5E1;
    --white: #FFFFFF;
    --offwhite: #F8FAFC;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--accent) 0%, var(--primary) 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.15);
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;
    
    /* Transitions */
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    color: var(--dark);
    background: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-fast);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
    transition: var(--transition-base);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.version-badge {
    background: var(--gradient-primary);
    color: var(--white);
    padding: 0.25rem 0.75rem;
    border-radius: 2rem;
    font-size: 0.75rem;
    font-weight: 600;
}

.nav-menu {
    display: flex;
    gap: var(--space-xl);
}

.nav-link {
    font-weight: 500;
    color: var(--dark);
    position: relative;
    transition: var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    width: 24px;
    height: 3px;
    background: var(--dark);
    border-radius: 2px;
    transition: var(--transition-base);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 80px;
}

.hero-background {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 1;
}

.hero-background::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.85) 0%, rgba(118, 75, 162, 0.85) 100%);
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.1); }
    66% { transform: translate(-20px, 20px) scale(0.9); }
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--white);
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: var(--space-xs) var(--space-md);
    border-radius: 2rem;
    margin-bottom: var(--space-lg);
    font-size: 0.9rem;
    font-weight: 500;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.badge-icon {
    font-size: 1.2rem;
}

.hero-title {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.title-main {
    font-size: clamp(3rem, 10vw, 5rem);
    font-weight: 900;
    letter-spacing: -0.02em;
    line-height: 1;
}

.title-gradient {
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 800;
    background: linear-gradient(to right, #fff, rgba(255, 255, 255, 0.8));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title-sub {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 600;
    opacity: 0.9;
}

.hero-description {
    font-size: 1.25rem;
    opacity: 0.95;
    margin-bottom: var(--space-xl);
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--space-2xl);
}

.hero-stats {
    display: flex;
    gap: var(--space-xl);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--space-2xl);
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1;
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.8;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero-scroll {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    color: var(--white);
    opacity: 0.7;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.scroll-line {
    width: 2px;
    height: 40px;
    background: rgba(255, 255, 255, 0.5);
    animation: scrollLine 1.5s ease-in-out infinite;
}

@keyframes scrollLine {
    0%, 100% { height: 40px; opacity: 0.5; }
    50% { height: 20px; opacity: 1; }
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 1rem 2rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.2);
    transform: translateX(-100%);
    transition: var(--transition-base);
}

.btn:hover::before {
    transform: translateX(0);
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.15);
    color: var(--white);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-large {
    padding: 1.25rem 2.5rem;
    font-size: 1.125rem;
}

.btn-icon {
    font-size: 1.25rem;
}

.btn-arrow {
    transition: var(--transition-base);
}

.btn:hover .btn-arrow {
    transform: translateX(4px);
}

/* ========================================
   Sections
   ======================================== */
section {
    padding: var(--space-2xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.section-subtitle {
    display: inline-block;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-xs);
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    margin-bottom: var(--space-md);
    line-height: 1.2;
}

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

.section-description {
    font-size: 1.125rem;
    color: var(--gray);
    max-width: 660px;
    margin: 0 auto;
}

/* ========================================
   Features Section
   ======================================== */
.features {
    background: var(--offwhite);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.feature-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
    color: var(--dark);
}

.feature-list {
    list-style: none;
}

.feature-list li {
    padding: var(--space-xs) 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--gray);
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: 700;
}

/* Alert Box */
.alert-box {
    background: linear-gradient(135deg, #FEF3C7 0%, #FDE68A 100%);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    display: flex;
    gap: var(--space-md);
    box-shadow: var(--shadow-md);
}

.alert-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.alert-content h4 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    color: var(--dark);
}

.alert-content p {
    margin-bottom: var(--space-sm);
    color: var(--dark-lighter);
}

.alert-content a {
    color: var(--primary);
    font-weight: 600;
}

/* ========================================
   Commercial Version Section
   ======================================== */
.commercial-version {
    background: linear-gradient(135deg, #FEF3C7 0%, #FDE68A 100%);
    padding: var(--space-2xl) 0;
}

.commercial-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    box-shadow: var(--shadow-lg);
    max-width: 900px;
    margin: 0 auto;
}

.commercial-content {
    text-align: center;
}

.commercial-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--space-lg);
}

.commercial-description {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--gray);
    margin-bottom: var(--space-xl);
    text-align: justify;
}

.commercial-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.feature-item {
    background: var(--offwhite);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    font-weight: 500;
    color: var(--dark);
}

.commercial-buttons {
    margin-bottom: var(--space-lg);
}

.commercial-note {
    color: var(--gray);
    font-style: italic;
    font-size: 0.95rem;
}

/* ========================================
   Hardware Section
   ======================================== */
.hardware-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--space-md);
}

.hardware-card {
    background: var(--white);
    border: 2px solid var(--gray-light);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    text-align: center;
    transition: var(--transition-base);
    position: relative;
}

.hardware-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.hardware-badge {
    position: absolute;
    top: -10px;
    right: -10px;
    background: var(--gradient-primary);
    color: var(--white);
    padding: 0.25rem 0.75rem;
    border-radius: 2rem;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    box-shadow: var(--shadow-md);
}

.hardware-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark);
}

/* ========================================
   Download Section
   ======================================== */
.download {
    background: var(--dark);
    color: var(--white);
}

.download-card {
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2xl);
}

.download-content {
    flex: 1;
    z-index: 2;
    position: relative;
}

.download-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    margin-bottom: var(--space-md);
}

.download-description {
    font-size: 1.125rem;
    opacity: 0.95;
    margin-bottom: var(--space-xl);
    max-width: 500px;
}

.download-buttons {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

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

.download-buttons .btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
}

.download-visual {
    position: relative;
    width: 300px;
    height: 300px;
    flex-shrink: 0;
}

.visual-circle {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
}

.circle-1 {
    width: 200px;
    height: 200px;
    top: 50px;
    left: 50px;
    animation: rotate 20s linear infinite;
}

.circle-2 {
    width: 150px;
    height: 150px;
    top: 75px;
    left: 75px;
    animation: rotate 15s linear infinite reverse;
}

.circle-3 {
    width: 100px;
    height: 100px;
    top: 100px;
    left: 100px;
    animation: rotate 10s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--dark);
    color: var(--white);
    padding: var(--space-2xl) 0 var(--space-lg);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand h3 {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: var(--space-xs);
}

.footer-brand p {
    opacity: 0.7;
}

.footer-links {
    display: flex;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.footer-links a {
    opacity: 0.8;
    transition: var(--transition-fast);
}

.footer-links a:hover {
    opacity: 1;
    color: var(--primary-light);
}

.footer-donate {
    text-align: center;
}

.footer-donate p {
    margin-bottom: var(--space-sm);
    opacity: 0.8;
    font-size: 0.9rem;
}

.footer-donate form {
    display: inline-block;
}

.footer-donate form input[type="image"] {
    transition: var(--transition-base);
    border-radius: var(--radius-sm);
}

.footer-donate form input[type="image"]:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
    opacity: 0.6;
    font-size: 0.9rem;
}

.footer-bottom a {
    color: var(--primary-light);
    text-decoration: underline;
}

.footer-bottom a:hover {
    opacity: 1;
}

/* ========================================
   Ensamblaje & Puesta en Marcha Sections
   ======================================== */
.ensamblaje {
    background: var(--white);
    padding: var(--space-2xl) 0;
}

.puesta {
    background: var(--offwhite);
    padding: var(--space-2xl) 0;
}

.content-section {
    max-width: 900px;
    margin: 0 auto;
}

.content-section p {
    margin-bottom: var(--space-md);
    line-height: 1.8;
    color: var(--gray);
}

.content-section h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin: var(--space-xl) 0 var(--space-md);
    color: var(--dark);
}

.content-section h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--dark);
}

.text-link {
    color: var(--primary);
    font-weight: 600;
    text-decoration: underline;
    transition: var(--transition-fast);
}

.text-link:hover {
    color: var(--primary-dark);
}

.image-container {
    text-align: center;
    margin: var(--space-xl) 0;
}

.assembly-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
    margin: var(--space-xl) 0;
}

.step-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    position: relative;
}

.step-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.step-number {
    position: absolute;
    top: -15px;
    left: var(--space-lg);
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    box-shadow: var(--shadow-md);
}

.info-box {
    background: linear-gradient(135deg, #E0E7FF 0%, #C7D2FE 100%);
    border-left: 4px solid var(--primary);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    margin: var(--space-xl) 0;
}

.info-box.info {
    background: linear-gradient(135deg, #DBEAFE 0%, #BFDBFE 100%);
    border-left-color: var(--accent);
}

.info-box strong {
    color: var(--dark);
    display: block;
    margin-bottom: var(--space-sm);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: var(--space-lg);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        transition: var(--transition-base);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .steps-grid {
        grid-template-columns: 1fr;
    }
    
    .download-card {
        flex-direction: column;
        text-align: center;
    }
    
    .download-visual {
        display: none;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        justify-content: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

/* ========================================
   Animations
   ======================================== */
.fade-in {
    animation: fadeIn 0.6s ease-out forwards;
}

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

/* Smooth Scroll */
@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}