:root {
    --primary-color: #000000;
    --text-color: #ffffff;
    --background-color: #000000;
    --border-color: #ffffff;
    --input-background: #111111;
    --hover-color: #333333;
    --accent-color: #ffffff;
    --error-color: #ff0000;
    --success-color: #ffffff;
    --grid-color: rgba(255, 255, 255, 0.15);
}

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

body {
    font-family: 'Plus Jakarta Sans', sans-serif;
    line-height: 1.5;
    color: var(--text-color);
    background-color: var(--background-color);
    position: relative;
    overflow-x: hidden;
}

/* Grid background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px) 0 0 / 30px 30px,
        linear-gradient(0deg, var(--grid-color) 1px, transparent 1px) 0 0 / 30px 30px;
    opacity: 0.3;
    pointer-events: none;
    z-index: 0;
}

/* Mouse follower */
.mouse-follower {
    position: fixed;
    width: 30px;
    height: 30px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.2) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    z-index: 9999;
    transition: transform 0.1s ease;
    mix-blend-mode: screen;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

/* Particles container */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.particle {
    position: absolute;
    width: 1px;
    height: 1px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    pointer-events: none;
    transition: transform 0.3s ease-out;
    box-shadow: 0 0 2px rgba(255, 255, 255, 0.2);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    z-index: 2;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
}

header::after {
    content: '';
    position: absolute;
    bottom: -1rem;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 2px;
    background: var(--accent-color);
    opacity: 0.5;
}

h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    position: relative;
    display: inline-block;
}

h1::before, h1::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2px solid var(--accent-color);
    opacity: 0.5;
}

h1::before {
    top: -10px;
    left: -10px;
    border-right: none;
    border-bottom: none;
}

h1::after {
    bottom: -10px;
    right: -10px;
    border-left: none;
    border-top: none;
}

.subtitle {
    font-size: 1.25rem;
    color: #888888;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.form-group {
    display: flex;
    gap: 0.5rem;
    max-width: 500px;
    width: 100%;
    position: relative;
}

input[type="email"] {
    flex: 1;
    padding: 0.75rem 1rem;
    background-color: var(--input-background);
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    color: var(--text-color);
    transition: all 0.3s ease;
}

input[type="email"]:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
}

button {
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: var(--text-color);
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

button:hover {
    background-color: var(--hover-color);
    border-color: var(--accent-color);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
}

button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.form-message {
    margin-top: 1rem;
    text-align: center;
    min-height: 1.5rem;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

footer {
    margin-top: 3rem;
    text-align: center;
    color: #888888;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

@media (max-width: 640px) {
    .container {
        padding: 1rem;
    }

    h1 {
        font-size: 2.5rem;
    }

    .form-group {
        flex-direction: column;
    }

    button {
        width: 100%;
    }
}