:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #06b6d4;
    --danger: #ef4444;
    --success: #10b981;
    --glass: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

#canvas-particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    /* Por encima del fondo, por debajo del contenido */
    pointer-events: none;
}

.gradient-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    /* Al fondo del todo */
    background: radial-gradient(circle at 120% 0%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(circle at -20% 100%, rgba(6, 182, 212, 0.15) 0%, transparent 50%),
        var(--bg-dark);
}

.gradient-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 50px 50px;
    mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, #000 30%, transparent 100%);
    opacity: 0.5;
}

header {
    padding: 2rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--glass-border);
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

nav a {
    color: var(--text-main);
    text-decoration: none;
    margin-left: 2rem;
    font-weight: 500;
    transition: color 0.3s;
}

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

.btn {
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    text-decoration: none;
    display: inline-block;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.3);
}

.hero {
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 5%;
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    line-height: 1.1;
    background: linear-gradient(to right, #fff, #94a3b8);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 700px;
    margin-bottom: 2.5rem;
}

.features {
    padding: 5rem 5%;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    position: relative;
    z-index: 2;
}

.card {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    padding: 2rem;
    border-radius: 16px;
    transition: transform 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
}

.card h3 {
    margin-bottom: 1rem;
    color: var(--accent);
}

.card p {
    color: var(--text-muted);
}

/* Payment Section */
.payment-container {
    max-width: 600px;
    margin: 5rem auto;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    padding: 3rem;
    border-radius: 24px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    position: relative;
    z-index: 2;
}

.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
}

input {
    width: 100%;
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
    background: rgba(15, 23, 42, 0.5);
    color: white;
    font-size: 1rem;
}

input:focus {
    outline: none;
    border-color: var(--primary);
}

.invoice-box {
    margin-top: 2rem;
    padding: 2rem;
    border: 1px dashed var(--primary);
    border-radius: 12px;
    background: rgba(99, 102, 241, 0.05);
}

.address-display {
    font-family: monospace;
    background: #000;
    padding: 1rem;
    border-radius: 4px;
    word-break: break-all;
    margin: 1rem 0;
    border: 1px solid var(--glass-border);
}

.status-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: bold;
    margin-bottom: 1rem;
}

.status-pending {
    background: #ca8a04;
    color: white;
}

.status-paid {
    background: var(--success);
    color: white;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate {
    animation: fadeIn 0.8s ease-out forwards;
}