:root {
    --bg: #f7f9fb;
    --card: #ffffff;
    --primary: #0b74da;
    --muted: #6b7280;
    --radius: 12px;
    --container: 1200px;
    font-family: Inter, Roboto, -apple-system, "Segoe UI", Arial, sans-serif;
}

body {
    margin: 0;
    background: var(--bg);
    color: #0f172a;
    line-height: 1.45
}

a {
    text-decoration: none;
    color: inherit
}

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 18px
}

/* заголовок, навигация, лого */
header {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.7));
    backdrop-filter: blur(4px);
    position: sticky;
    top: 0;
    z-index: 40;
    border-bottom: 1px solid #e6eef8
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 0
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px
}

.logo img {
    width: 48px;
    height: 48px;
    object-fit: contain;
    border-radius: 8px
}

.site-title {
    font-weight: 700;
    font-size: 18px
}

.sign {
    font-size: 12px;
    color: var(--muted)
}

nav {
    display: flex;
    gap: 16px
}

nav a {
    padding: 8px;
    border-radius: 8px;
    color: var(--muted);
    font-weight: 600
}

nav a:hover {
    background: #eaf3ff;
    color: var(--primary)
}

/* мобильное меню */
.mobile-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 72px;
    background: var(--card);
    padding: 12px;
    border-bottom: 1px solid #eef6ff;
}

.mobile-nav a {
    display: block;
    padding: 8px 6px;
    color: var(--muted);
    font-weight: 600;
}

.mobile-nav.show {
    display: block;
}

.page-title {
    margin-top: 28px;
    font-size: 32px;
    font-weight: 700
}

/* бургер для мобильных */
.burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.burger span {
    width: 25px;
    height: 3px;
    background: #333;
    border-radius: 3px;
}

/* контакты */
.contact-info {
    margin: 20px 0;
    background: var(--card);
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: 0 4px 14px rgba(11, 74, 133, 0.04)
}

.contact-info p {
    color: var(--muted);
    margin: 6px 0
}

/* форма */
.form-block {
    margin-top: 24px;
    background: var(--card);
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: 0 4px 14px rgba(11, 74, 133, 0.04)
}

form {
    display: flex;
    flex-direction: column;
    gap: 12px
}

input,
textarea {
    padding: 12px;
    border-radius: 8px;
    border: 1px solid #d8e3f0;
    font-size: 14px
}

textarea {
    resize: vertical;
    min-height: 80px
}

button {
    width: 150px;
    padding: 10px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer
}

button:hover {
    background: #095bb5
}

/* комментарии */
.comments {
    margin-top: 24px
}

.comment {
    background: var(--card);
    padding: 16px;
    border-radius: var(--radius);
    margin-bottom: 12px;
    box-shadow: 0 3px 10px rgba(11, 74, 133, 0.04)
}

.comment .name {
    font-weight: 600
}

.comment .email {
    color: var(--muted);
    font-size: 12px
}

.comment p {
    margin: 6px 0 0
}

/* подвал */
footer {
    padding: 24px 0;
    border-top: 1px dashed #e6eef8;
    margin-top: 28px
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center
}

/* Адаптивность */
@media (max-width: 768px) {
    .contact-container {
        flex-direction: column;
        gap: 20px;
    }
    nav ul {
        display: none;
        position: absolute;
        top: 60px;
        right: 20px;
        background: #fff;
        padding: 15px;
        border-radius: 10px;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        flex-direction: column;
        gap: 10px;
    }
    .contact-info,
    .contact-form {
        padding: 15px;
    }
    nav ul.active {
        display: flex;
    }
    form {
        gap: 10px;
    }

    .comments h2 {
        font-size: 20px;
    }
    .burger {
        display: flex;
    }
}

@media (max-width: 900px) {
    nav.main-nav {
        display: none;
    }

    .burger {
        display: flex;
    }
}