:root {
    --bg: #0f1117;
    --bg-card: #161b22;
    --text: #e6edf3;
    --text-secondary: #8b949e;
    --primary: #58a6ff;
    --primary-dark: #388bfd;
    --success: #3fb950;
    --danger: #f85149;
    --warning: #d29922;
    --border: #30363d;
    --shadow: 0 6px 16px rgba(0,0,0,0.4);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

/* Header */
header {
    background: linear-gradient(135deg, #0d1117 0%, #161b22 100%);
    padding: 1.2rem 1rem;
    text-align: center;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

header h1 {
    font-size: clamp(1.4rem, 5vw, 1.9rem);
    font-weight: 700;
    margin-bottom: 0.3rem;
}

header p {
    font-size: 0.82rem;
    color: var(--text-secondary);
}

/* Навигация */
nav {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 60px;
    z-index: 99;
    padding: 0.6rem 1rem;
}

.hamburger {
    font-size: 1.6rem;
    color: var(--primary);
    cursor: pointer;
    padding: 0.4rem;
    display: none;
}

.nav-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
}

.nav-links a {
    color: var(--text);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 999px;
    font-size: 0.9rem;
    transition: all 0.22s ease;
    background: rgba(88,166,255,0.08);
}

.nav-links a:hover,
.nav-links a.active {
    background: var(--primary);
    color: white;
    transform: translateY(-1px);
}

/* Мобильное меню */
@media (max-width: 768px) {
    .hamburger {
        display: block;
        float: right;
    }

    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-card);
        border-bottom: 1px solid var(--border);
        padding: 0.8rem 1rem;
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links a {
        margin: 0.3rem 0;
        text-align: center;
        border-radius: 8px;
    }
}

/* Контент */
.container {
    max-width: 1100px;
    margin: 1.5rem auto;
    padding: 0 1rem;
}

.content {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border);
    margin-bottom: 1.5rem;
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

.ip-display {
    font-size: clamp(2.1rem, 9vw, 3.8rem);
    font-weight: 800;
    text-align: center;
    margin: 1.2rem 0;
    background: linear-gradient(90deg, #58a6ff, #79c0ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Карточки информации */
.info-card {
    background: rgba(22,27,34,0.6);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.2rem;
    margin: 1rem 0;
    backdrop-filter: blur(6px);
    transition: all 0.25s ease;
}

.info-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

/* Таблицы */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    font-size: 0.92rem;
}

th, td {
    padding: 0.9rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    background: rgba(88,166,255,0.08);
    color: var(--primary);
    font-weight: 600;
    width: 35%;
}

/* Мобильная таблица → карточки */
@media (max-width: 640px) {
    table, thead, tbody, th, td, tr {
        display: block;
    }
    
    thead tr {
        position: absolute;
        top: -9999px;
        left: -9999px;
    }
    
    tr {
        margin-bottom: 1.2rem;
        border: 1px solid var(--border);
        border-radius: 10px;
        background: var(--bg-card);
    }
    
    td {
        border: none;
        position: relative;
        padding-left: 50%;
        padding: 0.8rem 1rem;
    }
    
    td:before {
        position: absolute;
        top: 0.8rem;
        left: 1rem;
        width: 45%;
        padding-right: 10px;
        white-space: nowrap;
        font-weight: 600;
        color: var(--primary);
        content: attr(data-label);
    }
}

/* Формы */
.form-group {
    margin: 1.2rem 0;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text);
}

.form-group input {
    width: 100%;
    padding: 0.9rem 1rem;
    background: #0d1117;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 1rem;
    transition: all 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(88,166,255,0.2);
}

.btn {
    background: var(--primary);
    color: white;
    padding: 0.9rem 1.8rem;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s;
    display: inline-block;
}

.btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(88,166,255,0.35);
}

/* Speed test — тёмный вариант */
.speed-test-container {
    text-align: center;
    padding: 2rem 1rem;
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border);
}

.speed-circle {
    width: clamp(140px, 38vw, 180px);
    height: clamp(140px, 38vw, 180px);
    margin: 1.5rem auto;
    border-radius: 50%;
    background: conic-gradient(var(--primary) 0deg, #21262d 0deg);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.4s ease;
}

.speed-circle::after {
    content: "";
    width: 78%;
    height: 78%;
    background: var(--bg-card);
    border-radius: 50%;
    position: absolute;
}

.speed-inner {
    z-index: 1;
    text-align: center;
}

.speed-mb {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--primary);
}

/* Анимация появления при загрузке страницы */
.content, .info-card, .service {
    animation: fadeInUp 0.7s ease-out forwards;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Сервисы (иконки) */
.services {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
    margin: 2rem 0;
}

.service {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.4rem 1rem;
    text-align: center;
    transition: all 0.28s ease;
}

.service:hover {
    transform: translateY(-6px);
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.service i {
    font-size: 2.4rem;
    color: var(--primary);
    margin-bottom: 0.8rem;
}

.service a {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
}

/* Footer */
footer {
    text-align: center;
    padding: 2.5rem 1rem;
    color: var(--text-secondary);
    border-top: 1px solid var(--border);
    margin-top: 2rem;
    font-size: 0.9rem;
}