:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --background-light: #f9fafb;
    --max-width: 1200px;
    --header-height: 70px;
}

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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.5;
    color: var(--text-primary);
}

/* Telegram Banner */
.telegram-banner {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    padding: 0.5rem;
}

.telegram-banner a {
    color: white;
    text-decoration: none;
    font-size: 0.875rem;
}

/* Header & Navigation */
.header {
    position: fixed;
    top: 2rem;
    left: 0;
    right: 0;
    background: white;
    border-bottom: 1px solid #e5e7eb;
    z-index: 50;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
}

/* Hero Section */
.hero {
    padding: 8rem 2rem 4rem;
    text-align: center;
    max-width: var(--max-width);
    margin: 0 auto;
}

.hero h1 {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.gradient-text {
    display: block;
    background: linear-gradient(to right, var(--primary-color), #60a5fa);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-description {
    max-width: 36rem;
    margin: 0 auto 2rem;
    color: var(--text-secondary);
    font-size: 1.125rem;
}

/* Buttons */
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: 0.375rem;
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
}

.button-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
}

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

.button-secondary {
    background-color: white;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    text-decoration: none;
}

.button-secondary:hover {
    background-color: var(--background-light);
}

/* Features Section */
.features {
    padding: 5rem 2rem;
    background-color: var(--background-light);
}

.features h2 {
    text-align: center;
    font-size: 2.25rem;
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: var(--max-width);
    margin: 0 auto;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.modal-content {
    background: white;
    padding: 2rem;
    border-radius: 0.5rem;
    max-width: 28rem;
    width: 90%;
    position: relative;
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }
}