:root {
    --bg: #001220;
    --accent: #0074D9;
    --accent-glow: rgba(0, 116, 217, 0.4);
    --text: #ffffff;
    --text-dim: rgba(255, 255, 255, 0.5);
    --glass: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.1);
    --font-main: 'Comfortaa', display;
}

[data-theme="light"] {
    --bg: #f8fbff;
    --accent: #0056b3;
    --accent-glow: rgba(0, 86, 179, 0.2);
    --text: #001220;
    --text-dim: rgba(0, 18, 32, 0.6);
    --glass: rgba(0, 0, 0, 0.02);
    --glass-border: rgba(0, 0, 0, 0.08);
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    transition: background-color 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.background-blobs {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    z-index: -1;
    filter: blur(80px);
    opacity: 0.6;
}

.blob {
    position: absolute;
    border-radius: 50%;
    background: var(--accent);
    transition: all 0.5s ease-out;
}

.noise {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    z-index: 0;
    opacity: 0.04;
    pointer-events: none;
    /* Обрати внимание, data-image разрешен в CSP */
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 250 250' xmlns='http://www.w3.org/2000/svg'%3BaseFilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/feTurbulence%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.wrapper {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 800px;
    padding: 20px;
    text-align: center;
}

header {
    margin-bottom: 60px;
    animation: slideDown 1s ease forwards;
}

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

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 10px;
    letter-spacing: -2px;
}

.subtitle {
    font-family: 'Montserrat', sans-serif;
    text-transform: uppercase;
    letter-spacing: 4px;
    font-size: 0.8rem;
    color: var(--text-dim);
    font-weight: 300;
}

.btn-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 40px;
}

.btn {
    position: relative;
    padding: 24px;
    border-radius: 24px;
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(15px);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    cursor: pointer;
}

.btn:hover {
    transform: scale(1.02) translateY(-5px);
    border-color: var(--accent);
    box-shadow: 0 15px 30px var(--accent-glow);
    color: #fff;
    background: var(--accent);
}

.btn-main {
    grid-column: span 2;
    margin-top: 10px;
    background: var(--text);
    color: var(--bg);
    border: none;
    font-weight: 700;
}

.btn-main:hover {
    background: var(--accent);
    color: #fff;
}

.theme-switch {
    position: fixed;
    top: 40px;
    right: 40px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 10;
    transition: 0.3s;
}

.theme-switch:hover {
    transform: rotate(15deg) scale(1.1);
    border-color: var(--accent);
}

.theme-switch svg {
    width: 20px;
    fill: var(--text);
}

.footer-info {
    margin-top: 80px;
    font-size: 0.7rem;
    font-family: 'Montserrat', sans-serif;
    color: var(--text-dim);
    display: flex;
    justify-content: center;
    gap: 30px;
    opacity: 0.6;
}

@media (max-width: 650px) {
    .btn-group { grid-template-columns: 1fr; }
    .btn-main { grid-column: span 1; }
    h1 { font-size: 2.2rem; }
    .theme-switch { top: 20px; right: 20px; }
}