:root {
    --primary: #9f00ff;
    --primary-glow: rgba(159, 0, 255, 0.5);
    --secondary: #b085ff;
    --bg: #f4f6f9;
    --card-bg: rgba(255, 255, 255, 0.85);
    --text: #121214;
    --text-muted: #505059;
    --border: rgba(0, 0, 0, 0.08);
    --nav-height: 80px;
    --shadow: 0 8px 20px -6px rgba(0, 0, 0, 0.05);
}

body.dark-mode {
    --bg: #0b0b0d;
    --card-bg: rgba(20, 20, 24, 0.7);
    --text: #ffffff;
    --text-muted: #a8a8b3;
    --border: rgba(255, 255, 255, 0.08);
    --shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.5);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', 'Segoe UI', sans-serif;
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg);
    color: var(--text);
    overflow-x: hidden;
    transition: background-color 0.4s ease, color 0.4s ease;
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main { flex: 1; }

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 4px; }

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

header {
    height: var(--nav-height);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    transition: all 0.3s;
    background: rgba(244, 246, 249, 0.8);
}

body.dark-mode header {
    background: rgba(11, 11, 13, 0.8);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
}

.logo-icon {
    color: var(--primary);
    font-size: 2rem;
    filter: drop-shadow(0 0 10px var(--primary-glow));
}

.nav-links {
    display: flex;
    gap: 40px;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    transition: 0.3s;
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background-color: var(--primary);
    transition: width 0.3s;
}

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

.icon-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: grid;
    place-items: center;
    font-size: 1.2rem;
    transition: 0.3s;
}

.icon-btn:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
    transform: rotate(15deg);
    box-shadow: 0 0 15px var(--primary-glow);
}

.btn {
    padding: 14px 32px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: 0.3s;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    box-shadow: 0 4px 20px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px var(--primary-glow);
}

.btn-secondary {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(159, 0, 255, 0.05);
}

.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: 20px;
    box-shadow: var(--shadow);
}

footer {
    margin-top: 100px;
    padding: 60px 0 40px;
    border-top: 1px solid var(--border);
    background: var(--bg);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
}

.footer-info p {
    color: var(--text-muted);
    line-height: 1.6;
    margin: 15px 0 20px;
}

.footer-links-group h4 {
    margin-bottom: 20px;
    color: var(--text);
    font-size: 1.1rem;
    font-weight: 700;
}

.footer-links-group ul { list-style: none; }
.footer-links-group li { margin-bottom: 12px; }

.footer-links-group a {
    text-decoration: none;
    color: var(--text-muted);
    transition: 0.3s;
}

.footer-links-group a:hover { color: var(--primary); padding-left: 5px; }

.socials { display: flex; gap: 15px; }

.socials a {
    color: var(--text-muted);
    font-size: 1.5rem;
    transition: 0.3s;
}

.socials a:hover {
    color: var(--primary);
    transform: translateY(-3px);
    filter: drop-shadow(0 0 8px var(--primary-glow));
}

.snowflake {
    position: fixed;
    top: -10px;
    color: #fff;
    font-size: 1em;
    font-family: Arial;
    text-shadow: 0 0 1px #000;
    animation-name: fall, shake;
    animation-duration: 10s, 3s;
    animation-timing-function: linear, ease-in-out;
    animation-iteration-count: infinite, infinite;
    animation-play-state: running, running;
    z-index: 9999;
    pointer-events: none;
    opacity: 0.8;
}

body:not(.dark-mode) .snowflake { color: #8a9bb8; }

@keyframes fall {
    0% { top: -10%; }
    100% { top: 100%; }
}

@keyframes shake {
    0% { transform: translateX(0px); }
    50% { transform: translateX(40px); }
    100% { transform: translateX(0px); }
}

@media (max-width: 768px) {
    .footer-grid { grid-template-columns: 1fr; text-align: center; gap: 30px; }
    .socials { justify-content: center; }
}