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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 50%, #2a2a2a 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow-x: hidden;
    position: relative;
}

/* Animated background particles */
.particles {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 1;
}

.particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: #e8750c;
    border-radius: 50%;
    animation: float 8s infinite ease-in-out;
    opacity: 0.6;
    will-change: transform, opacity;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); opacity: 0.6; }
    50% { transform: translateY(-20px) rotate(180deg); opacity: 1; }
}

.container {
    text-align: center;
    max-width: 600px;
    width: 90%;
    padding: 40px;
    background: rgba(0, 0, 0, 0.8);
    border-radius: 20px;
    border: 1px solid #e8750c;
    box-shadow: 0 20px 40px rgba(232, 117, 12, 0.2);
    backdrop-filter: blur(10px);
    z-index: 2;
    position: relative;
    animation: slideIn 1s ease-out;
    margin: 20px;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(50px); }
    to { opacity: 1; transform: translateY(0); }
}

.logo {
    font-size: 3.5rem;
    font-weight: bold;
    color: #e8750c;
    margin-bottom: 10px;
    text-shadow: 0 0 20px rgba(232, 117, 12, 0.5);
    animation: pulse 2s infinite ease-in-out;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.subtitle {
    font-size: 1.2rem;
    color: #ccc;
    margin-bottom: 30px;
    font-weight: 300;
}

.description {
    font-size: 1rem;
    color: #999;
    margin-bottom: 40px;
    line-height: 1.6;
}

.language-selector {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.language-card {
    background: linear-gradient(145deg, #1a1a1a, #2a2a2a);
    border: 2px solid #333;
    border-radius: 15px;
    padding: 30px 40px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    color: #fff;
    position: relative;
    overflow: hidden;
    min-width: 200px;
    flex: 1;
    max-width: 250px;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.language-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(232, 117, 12, 0.1), transparent);
    transition: left 0.5s ease;
}

.language-card:hover::before {
    left: 100%;
}

.language-card:hover {
    transform: translateY(-5px) scale(1.02);
    border-color: #e8750c;
    box-shadow: 0 15px 30px rgba(232, 117, 12, 0.3);
}

.language-flag {
    font-size: 3rem;
    margin-bottom: 15px;
    display: block;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

.language-name {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 10px;
    color: #e8750c;
}

.language-desc {
    font-size: 0.9rem;
    color: #bbb;
    opacity: 0.8;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 15px;
    margin-top: 40px;
}

.feature {
    background: rgba(232, 117, 12, 0.1);
    border: 1px solid rgba(232, 117, 12, 0.3);
    border-radius: 10px;
    padding: 20px 15px;
    text-align: center;
    transition: transform 0.3s ease;
}

.feature:hover {
    transform: translateY(-5px);
    background: rgba(232, 117, 12, 0.2);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 10px;
    display: block;
}

.feature-text {
    font-size: 0.9rem;
    color: #ccc;
}

.footer {
    position: absolute;
    bottom: 14px;
    left: 50%;
    transform: translateX(-50%);
    color: #666;
    font-size: 0.8rem;
    z-index: 2;
    white-space: nowrap;
}

.language-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.9);
    border: 2px solid #e8750c;
    border-radius: 25px;
    padding: 12px 18px;
    cursor: pointer;
    color: #e8750c;
    font-size: 1rem;
    font-weight: bold;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    z-index: 10;
    user-select: none;
    touch-action: manipulation;
    min-width: 50px;
    text-align: center;
    -webkit-tap-highlight-color: transparent;
}

.language-toggle:hover {
    background: rgba(232, 117, 12, 0.2);
    transform: scale(1.1);
    box-shadow: 0 5px 15px rgba(232, 117, 12, 0.4);
}

/* Mobile-first responsive design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .container {
        padding: 30px 20px;
        margin: 10px;
        width: calc(100% - 20px);
        max-width: none;
    }

    .logo {
        font-size: 2.8rem;
    }

    .subtitle {
        font-size: 1.1rem;
    }

    .description {
        font-size: 0.95rem;
        margin-bottom: 30px;
    }

    .language-selector {
        flex-direction: column;
        gap: 15px;
        align-items: center;
    }

    .language-card {
        min-width: auto;
        width: 100%;
        max-width: 280px;
        padding: 25px 20px;
    }

    .language-flag {
        font-size: 2.5rem;
    }

    .language-name {
        font-size: 1.3rem;
    }

    .language-desc {
        font-size: 0.85rem;
    }

    .features {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
        margin-top: 30px;
    }

    .feature {
        padding: 15px 10px;
    }

    .feature-icon {
        font-size: 1.5rem;
    }

    .feature-text {
        font-size: 0.8rem;
    }

    .footer {
        position: relative;
        bottom: auto;
        left: auto;
        transform: none;
        margin-top: 30px;
        font-size: 0.75rem;
        white-space: normal;
        text-align: center;
    }

    .language-toggle {
        top: 15px;
        right: 15px;
        padding: 10px 15px;
        font-size: 0.9rem;
    }

    /* Оптимизация анимаций для мобильных устройств */
    .particle {
        animation-duration: 12s;
    }

    .logo {
        animation-duration: 3s;
    }

    .language-flag {
        animation-duration: 4s;
    }

    /* Отключение некоторых анимаций на слабых устройствах */
    @media (max-width: 480px) {
        .particle {
            animation: none;
            opacity: 0.3;
        }
        
        .language-flag {
            animation: none;
        }
    }
}

@media (max-width: 480px) {
    .container {
        padding: 25px 15px;
    }

    .logo {
        font-size: 2.5rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .description {
        font-size: 0.9rem;
    }

    .features {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .language-card {
        padding: 20px 15px;
    }

    .language-flag {
        font-size: 2rem;
    }

    .language-name {
        font-size: 1.2rem;
    }

    .language-desc {
        font-size: 0.8rem;
    }
}

/* Улучшенная поддержка touch-устройств */
@media (hover: none) and (pointer: coarse) {
    .language-card:hover {
        transform: none;
        border-color: #333;
        box-shadow: none;
    }
    
    .language-card:active {
        transform: translateY(-2px) scale(0.98);
        border-color: #e8750c;
        box-shadow: 0 5px 15px rgba(232, 117, 12, 0.3);
    }

    .feature:hover {
        transform: none;
        background: rgba(232, 117, 12, 0.1);
    }
    
    .language-toggle:hover {
        transform: none;
        background: rgba(0, 0, 0, 0.9);
        box-shadow: none;
    }

    .language-toggle:active {
        transform: scale(0.95);
        background: rgba(232, 117, 12, 0.2);
    }
}

/* Дополнительные оптимизации для производительности */
.language-card,
.feature,
.language-toggle {
    will-change: transform;
}

/* Уменьшение количества частиц на мобильных */
@media (max-width: 768px) {
    .particles {
        opacity: 0.7;
    }
}

/* Для Firefox */
html {
  scrollbar-width: thin;
  scrollbar-color: #e8750c transparent; /* бегунок | фон */
}

/* Для Chrome, Edge, Opera и других WebKit-браузеров */
::-webkit-scrollbar {
  width: 10px; /* тонкий скроллбар */
  height: 10px; /* для горизонтального */
}

/* Прозрачный фон трека */
::-webkit-scrollbar-track {
  background: transparent;
}

/* Бегунок */
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, #e8750c, #f08a2e);
  border-radius: 10px;
  box-shadow: inset 0 0 4px rgba(0,0,0,0.15);
  transition: background 0.3s ease, transform 0.2s ease;
}

/* Hover-эффект */
::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, #d06408, #e8750c);
  transform: scaleX(1.2);
}