/* Global Reset and Typography Variables */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg-dark: #121214;
    --bg-card: #1a1a1e;
    --bg-input: #26262b;
    --border-button-copy: limegreen;
    --bg-button-copy: green;
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --text-main: #f4f4f5;
    --text-muted: #a1a1aa;
    --border-color: #3f3f46;
    --code-bg: #09090b;
}

html {
    scroll-behavior: smooth;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
}

/* Header & Sticky Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 70px;
    background-color: rgba(18, 18, 20, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 0 4%;
}

.navbar .logo {
    float: left;
    line-height: 70px;
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.05rem;
}

.navbar .logo span {
    color: var(--primary);
    font-size: 0.9rem;
    vertical-align: super;
    font-weight: 400;
}

.navbar nav {
    float: right;
    line-height: 70px;
}

.navbar nav a {
    color: var(--text-muted);
    text-decoration: none;
    margin-left: 24px;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

/* Page structural sections layout */
.full-page {
    width: 100%;
    min-height: 100vh;
    padding: 100px 4% 40px 4%;
    position: relative;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-size: 2.2rem;
    text-align: center;
    margin-bottom: 10px;
    letter-spacing: -0.03rem;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 40px;
}

/* Buttons styles */
.btn {
    display: inline-block;
    padding: 12px 28px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 6px;
    text-decoration: none;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
    border: none;
    text-align: center;
}

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

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

.btn-secondary {
    background-color: transparent;
    color: var(--text-main);
    border: 1px solid var(--border-color);
    margin-left: 15px;
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.btn-large {
    padding: 16px 40px;
    font-size: 1.1rem;
}

/* Hero Section Styles */
.hero-section {
    text-align: center;
    background: radial-gradient(circle at top right, 
                              rgba(99, 102, 241, 0.08), 
                              transparent 55%);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90%;
}

.hero-section h1 {
    font-size: 3.5rem;
    line-height: 1.15;
    margin-bottom: 44px;
    letter-spacing: -0.06rem;
}

.hero-section p {
    font-size: 1.25rem;
    color: var(--text-muted);
    line-height: 2;
    margin-bottom: 60px;
}

.dark-rainbow-loop {
    /* Fondo base oscuro con un degradado sutil de espectro amplio */
    background: radial-gradient(
        circle at 50% 50%, 
        rgba(99, 102, 241, 0.15) 0%,   /* Índigo base */
        rgba(236, 72, 153, 0.28) 30%,  /* Rosa sutil */
        rgba(16, 185, 129, 0.25) 60%,  /* Verde esmeralda sutil */
        #121214 100%                   /* Color de fondo oscuro de tu landing */
    );
    background-size: 200% 200%;
    
    /* Vinculación de la animación: 12 segundos, interpolación lineal, bucle infinito */
    animation: rainbowShift 12s linear infinite;
}

/* Feature Cards Grid Layout */
.features-section {
    background-color: #161619;
}

.features-grid {
    /* display: block; */
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    width: 100%;
    margin-top: 30px;
}

.feature-card {
    display: block;
    float: left;
    width: 360px;
    height: 360px;
    margin: 1%;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 35px;
    border-radius: 8px;
    transition: transform 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
}

.card-icon {
    text-align: center;
    font-size: 4rem;
    margin-bottom: 30px;
}

.feature-card h3 {
    text-align: center;
    font-size: 1.3rem;
    margin-bottom: 30px;
    height: 36px;
}

.feature-card p {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Code Snippets Layout */
.code-section {
    background-color: var(--bg-dark);
}

.code-block-wrapper {
    background-color: var(--code-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 30px;
    overflow: hidden;
}

.code-header {
    background-color: var(--bg-card);
    padding: 12px 20px;
    height: 3rem;
    border-bottom: 1px solid var(--border-color);
    font-family: monospace;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.code-header span {
    font-size: 1.2rem;
    float: left;
    line-height: 26px;
}

.code-header .copy-btn {
    float: right;
    background-color: var(--bg-button-copy);
    color: var(--text-main);
    border: 1px solid var(--border-button-copy);
    padding: 4px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
}

.code-header .copy-btn:hover {
    background-color: var(--border-color);
}

pre {
    padding: 20px;
    overflow-x: auto;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    color: #e4e4e7;
}

/* Interactive Sandbox Form */
.demo-section {
    background-color: #161619;
}

.sandbox-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 40px;
    border-radius: 10px;
    max-width: 900px;
    margin: 0 auto;
}

.sandbox-row {
    width: 100%;
    margin-bottom: 25px;
}

.sandbox-row::after, .navbar::after, .features-grid::after {
    content: "";
    display: block;
    clear: both;
}

.form-group {
    display: block;
    float: left;
    width: 48%;
    margin-right: 4%;
}

.form-group:last-child {
    margin-right: 0;
}

.form-group.full-width {
    width: 100%;
    margin-right: 0;
}

label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-muted);
}

input[type="text"], input[type="email"], select, textarea {
    width: 100%;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    padding: 12px 16px;
    border-radius: 6px;
    color: var(--text-main);
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s;
}

input[type="text"]:focus, input[type="email"]:focus, select:focus, textarea:focus {
    border-color: var(--primary);
}

textarea {
    resize: vertical;
}

.sandbox-actions {
    text-align: center;
    margin-top: 15px;
}

/* Contact and Donation Split Layout */
.split-container {
    margin-top: 20px;
}

.contact-box {
    float: left;
    width: 55%;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 40px;
    border-radius: 8px;
}

.donate-box {
    float: right;
    width: 40%;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 40px;
    border-radius: 8px;
    text-align: center;
}

.contact-box h3, .donate-box h3 {
    font-size: 1.6rem;
    margin-bottom: 12px;
}

.contact-box p, .donate-box p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 25px;
    line-height: 1.5;
}

.contact-box .form-group {
    width: 100%;
    margin-bottom: 20px;
}

/* QR Code Placeholder */
.qr-placeholder-container {
    width: 100%;
    margin: 20px auto;
    max-width: 240px;
}

.qr-box {
    background-color: var(--bg-input);
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 20px;
    aspect-ratio: 1 / 1;
    position: relative;
}

.qr-graphic {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90%;
}

.qr-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 10px;
}

.qr-graphic p {
    font-size: 0.8rem;
    font-family: monospace;
    color: var(--text-muted);
    margin-bottom: 0;
}

.qr-graphic img {
    width: 200px;
}

.donate-note {
    font-size: 0.85rem !important;
    margin-top: 15px;
}

@keyframes rainbowShift {
    0% {
        background-position: 0% 50%;
        filter: hue-rotate(0deg);
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
        /* Completa los 360 grados del círculo cromático para un loop perfecto */
        filter: hue-rotate(360deg);
    }
}

/* Responsive Media Queries */
@media (max-width: 992px) {
    .feature-card {
        width: 100%;
        float: none;
        margin: 0 0 20px 0;
        min-height: auto;
    }
    .contact-box, .donate-box {
        width: 100%;
        float: none;
        margin-bottom: 30px;
    }
    .hero-section h1 {
        font-size: 2.6rem;
    }
}

@media (max-width: 768px) {
    .navbar nav {
        display: none;
    }
    .form-group {
        width: 100%;
        float: none;
        margin-right: 0;
        margin-bottom: 15px;
    }
}