:root {
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --header-height: 72px;
}

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

body {
    font-family: var(--font-family);
    color: var(--color-text);
    background-color: var(--color-background);
    line-height: 1.6;
}

.site-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    background: var(--color-background);
    z-index: 1000;
}

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

.site-branding .custom-logo {
    width: var(--logo-width, 200px);
    height: auto;
}

.site-branding .site-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
}

.site-description {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

.site-navigation {
    flex: 1;
    display: flex;
    justify-content: center;
}

.site-navigation .menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.site-navigation .menu-item a {
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.site-navigation .menu-item a:hover {
    color: var(--color-primary);
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    font-size: 0.875rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.2s;
    cursor: pointer;
}

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

.btn-register:hover {
    background: var(--color-primary-hover);
}

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

.btn-login:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

main {
    min-height: calc(100vh - var(--header-height));
}

.site-navigation .menu-item > a i {
    margin-right: 8px;
    width: 20px;
    text-align: center;
}

.site-footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    margin-top: auto;
}

.site-footer .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.footer-top {
    padding: 40px 0;
    border-bottom: 1px solid var(--color-border);
}

.footer-middle {
    padding: 40px 0;
}

.footer-columns {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

@media (max-width: 768px) {
    .footer-columns {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .footer-columns {
        grid-template-columns: 1fr;
    }
}

.footer-widget {
    word-wrap: break-word;
}

.footer-bottom {
    padding: 20px 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.theme-credit {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

article {
    margin-bottom: 40px;
}

.entry-content,
.entry-summary {
    margin-top: 20px;
}

.entry-meta {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin: 10px 0;
}

.archive-header,
.search-header {
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--color-border);
}

.archive-header h1,
.search-header h1 {
    font-size: 2rem;
}

.pagination {
    margin: 40px 0;
}

.pagination a,
.pagination .current {
    padding: 8px 16px;
    margin: 0 4px;
    border: 1px solid var(--color-border);
    display: inline-block;
}

.pagination a:hover {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.error-404 {
    text-align: center;
    padding: 60px 20px;
}

.error-404 h1 {
    font-size: 6rem;
    color: var(--color-primary);
}

.error-404 h2 {
    font-size: 2rem;
    margin: 20px 0;
}

.search-form {
    margin-top: 20px;
}

.search-form input {
    padding: 10px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    margin-right: 10px;
}

.search-form button {
    padding: 10px 20px;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.comments-area {
    margin-top: 40px;
    padding-top: 40px;
    border-top: 1px solid var(--color-border);
}

.comments-title {
    margin-bottom: 30px;
}

.comment-list {
    list-style: none;
    padding: 0;
}

.comment {
    margin-bottom: 30px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--color-border);
}

.comment-author {
    font-weight: bold;
}

.comment-meta {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

.comment-content {
    margin-top: 15px;
}

#respond {
    margin-top: 30px;
}

#respond input,
#respond textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    margin-bottom: 15px;
    font-family: inherit;
}

#respond input[type="submit"] {
    width: auto;
    background: var(--color-primary);
    color: #fff;
    border: none;
    padding: 12px 24px;
    cursor: pointer;
}

#respond input[type="submit"]:hover {
    background: var(--color-primary-hover);
}

.page-links {
    margin: 20px 0;
}

.nav-links {
    display: flex;
    gap: 10px;
}

.mobile-header {
    display: none;
}

.mobile-menu {
    display: none;
}

@media (max-width: 768px) {
    .site-header .site-navigation,
    .site-header .header-actions {
        display: none;
    }

    .mobile-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0 15px;
        height: 60px;
        background: var(--color-background);
        border-bottom: 1px solid var(--color-border);
        position: sticky;
        top: 0;
        z-index: 1000;
    }

    .mobile-menu-toggle {
        background: none;
        border: none;
        font-size: 1.25rem;
        cursor: pointer;
        color: var(--color-text);
        padding: 10px;
        margin-right: 5px;
    }

    .mobile-branding {
        flex: 1;
        text-align: center;
        display: flex;
        justify-content: center;
    }

    .mobile-branding .custom-logo {
        max-height: 30px;
        width: auto;
    }

    .mobile-branding .site-title {
        font-size: 1.25rem;
        font-weight: 700;
        color: var(--color-text);
        text-decoration: none;
    }

    .mobile-actions {
        display: flex;
        gap: 2px;
    }

    .mobile-actions a {
        font-size: 1rem;
        color: var(--color-text);
        padding: 10px 8px;
        display: flex;
        align-items: center;
        justify-content: center;
        width: 36px;
        height: 36px;
        border-radius: 50%;
        transition: background 0.2s;
    }

    .mobile-actions a:hover {
        background: var(--color-surface);
    }

    .mobile-menu {
        display: block;
        position: fixed;
        top: 0;
        left: -100%;
        width: 280px;
        height: 100vh;
        background: var(--color-background);
        z-index: 2000;
        transition: left 0.3s ease;
        box-shadow: 2px 0 10px rgba(0,0,0,0.1);
    }

    body.mobile-menu-open .mobile-menu {
        left: 0;
    }

    body.mobile-menu-open::before {
        content: "";
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0,0,0,0.5);
        z-index: 1500;
    }

    .mobile-menu-close {
        position: absolute;
        top: 15px;
        right: 15px;
        background: none;
        border: none;
        font-size: 1.5rem;
        cursor: pointer;
        color: var(--color-text);
        padding: 8px;
    }

    .mobile-navigation {
        margin-top: 60px;
        padding: 20px;
    }

    .mobile-menu-list {
        list-style: none;
        padding: 0;
        margin: 0;
    }

    .mobile-menu-list li {
        margin-bottom: 15px;
    }

    .mobile-menu-list a {
        color: var(--color-text);
        text-decoration: none;
        font-size: 1rem;
        font-weight: 500;
        display: block;
        padding: 10px 0;
        border-bottom: 1px solid var(--color-border);
    }

    .mobile-menu-list a i {
        margin-right: 10px;
        width: 20px;
    }

    .mobile-auth-buttons {
        padding: 20px;
        display: flex;
        flex-direction: column;
        gap: 10px;
    }

    .mobile-auth-buttons .btn {
        width: 100%;
        text-align: center;
    }
}