:root {
    /* Color Palette */
    --primary-color: #0088cc; /* Telegram Blue */
    --primary-hover: #0077b5;
    --secondary-color: #1c1c1e; /* Dark Gray */
    --accent-color: #34c759; /* Success Green */
    --danger-color: #ff3b30; /* Error/Problem Red */
    --text-main: #1d1d1f; /* Almost Black */
    --text-secondary: #86868b; /* Gray Text */
    --bg-light: #fbfbfd; /* Off-white background */
    --bg-white: #ffffff;
    --border-color: #d2d2d7;
    
    /* Spacing */
    --container-width: 1200px;
    --section-padding: 80px 0;
    --mobile-padding: 40px 0;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    
    /* Shadow */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.12);
}

/* Reset & Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--text-main);
    background-color: var(--bg-light);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Typography Utilities */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

h1 {
    font-size: 3.5rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

/* Container */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Button Component */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 980px; /* Pill shape */
    font-weight: 600;
    font-size: 1.125rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 12px rgba(0, 136, 204, 0.3);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 136, 204, 0.4);
}

.btn-secondary {
    background-color: rgba(0, 136, 204, 0.1);
    color: var(--primary-color);
}

.btn-secondary:hover {
    background-color: rgba(0, 136, 204, 0.2);
}

.btn-large {
    padding: 18px 48px;
    font-size: 1.25rem;
}

.section-title {
    max-width: 800px;
    margin: 0 auto 3rem;
    text-align: center;
}

.section-title span {
    display: block;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}