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

:root {
    --primary: #6c5ce7;
    --primary-light: #a29bfe;
    --primary-dark: #5a4bd1;
    --accent: #00cec9;
    --accent-light: #81ecec;
    --bg: #f5f6fa;
    --bg-card: #ffffff;
    --text: #2d3436;
    --text-light: #636e72;
    --text-muted: #b2bec3;
    --border: #dfe6e9;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 6px 24px rgba(0, 0, 0, 0.12);
    --radius: 10px;
    --radius-sm: 6px;
    --nav-height: 64px;
    --max-width: 1200px;
    --transition: 0.3s ease
}

html {
    scroll-behavior: smooth;
    font-size: 16px
}

body {
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column
}

a {
    text-decoration: none;
    color: var(--primary);
    transition: color var(--transition)
}

a:hover {
    color: var(--primary-dark)
}

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

button {
    cursor: pointer;
    font-family: inherit;
    border: none;
    outline: none
}

input,
select,
textarea {
    font-family: inherit;
    outline: none
}

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    height: var(--nav-height)
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.5px
}

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

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
    list-style: none
}

.nav-links a {
    color: var(--text);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    padding: 4px 0
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width var(--transition)
}

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

.nav-links a:hover::after {
    width: 100%
}

.nav-links a.active {
    color: var(--primary)
}

.nav-links a.active::after {
    width: 100%
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    padding: 8px
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: var(--transition)
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px)
}

.hamburger.active span:nth-child(2) {
    opacity: 0
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px)
}

.mobile-nav {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    height: 100vh;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    z-index: 999
}

.mobile-nav.active {
    display: block
}

.mobile-nav ul {
    list-style: none;
    display: flex;
    flex-direction: column
}

.mobile-nav a {
    display: block;
    padding: 12px 24px;
    color: var(--text);
    font-weight: 500;
    font-size: 1rem;
    transition: background var(--transition)
}

.mobile-nav a:hover {
    background: var(--bg);
    color: var(--primary)
}

.site-footer {
    background: #2d3436;
    color: #dfe6e9;
    padding: 48px 0 24px;
    margin-top: auto
}

.footer-content,
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 32px
}

.footer-brand .logo {
    color: #fff;
    font-size: 1.3rem;
    margin-bottom: 12px;
    display: inline-block
}

.footer-brand .logo span {
    color: var(--primary-light)
}

.footer-brand p {
    color: #b2bec3;
    font-size: 0.9rem;
    line-height: 1.7;
    max-width: 320px
}

.footer-links h4 {
    color: #fff;
    font-size: 0.95rem;
    margin-bottom: 16px;
    font-weight: 600
}

.footer-links ul {
    list-style: none
}

.footer-links li {
    margin-bottom: 10px
}

.footer-links a {
    color: #b2bec3;
    font-size: 0.9rem;
    transition: color var(--transition)
}

.footer-links a:hover {
    color: var(--primary-light)
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    text-align: center;
    color: #636e72;
    font-size: 0.85rem
}

.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: 0 4px 16px rgba(108, 92, 231, 0.3);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 900;
    border: none
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-2px)
}

.page-hero {
    padding: 60px 0 40px;
    text-align: center
}

.page-hero h1 {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 12px
}

.page-hero p {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
    border: none
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(108, 92, 231, 0.3)
}

.btn-secondary {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary)
}

.btn-secondary:hover {
    background: var(--primary);
    color: #fff
}

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

.btn-accent:hover {
    background: #00b5b0;
    color: #fff
}

.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 28px;
    transition: var(--transition)
}

.card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px)
}

main {
    flex: 1
}

@media(max-width:768px) {
    .nav-links {
        display: none
    }

    .hamburger {
        display: flex
    }

    .footer-content,
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px
    }

    .page-hero h1 {
        font-size: 1.7rem
    }

    .page-hero p {
        font-size: 1rem
    }

    .page-hero {
        padding: 40px 0 28px
    }

    .container {
        padding: 0 16px
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 40px;
        height: 40px
    }
}

@media(max-width:480px) {
    .page-hero h1 {
        font-size: 1.4rem
    }

    .site-header .container {
        padding: 0 12px
    }
}