/* 整体风格简洁、现代，避免使用紫色 */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
    background: radial-gradient(circle at top left, #e0f2fe, #f9fafb);
    color: #111827;
    line-height: 1.6;
}

a {
    color: #2563eb;
    text-decoration: none;
    transition: color 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease;
}

a:hover {
    text-decoration: none;
    color: #1d4ed8;
}

.bk-container {
    width: 100%;
    max-width: 1040px;
    margin: 0 auto;
    padding: 0 20px;
}

.bk-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(10px);
    color: #e5e7eb;
    border-bottom: 1px solid rgba(148, 163, 184, 0.35);
}

.bk-header .bk-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
}

.bk-site-title a {
    font-size: 26px;
    font-weight: 700;
    color: #f9fafb;
}

.bk-site-desc {
    color: #9ca3af;
    margin-top: 2px;
    font-size: 13px;
}

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

.bk-nav a {
    padding: 7px 14px;
    border-radius: 999px;
    background: rgba(148, 163, 184, 0.12);
    color: #e5e7eb;
    font-size: 13px;
    border: 1px solid transparent;
}

.bk-nav a:hover {
    background: rgba(37, 99, 235, 0.18);
    border-color: rgba(37, 99, 235, 0.5);
}

.bk-main {
    padding: 28px 0 40px;
}

.bk-post-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 18px;
}

.bk-post-list .bk-post-item {
    background: #ffffff;
    border-radius: 16px;
    padding: 18px 18px 20px;
    border: 1px solid rgba(229, 231, 235, 0.9);
    box-shadow: 0 18px 45px rgba(15, 23, 42, 0.06);
    transition: transform 0.16s ease, box-shadow 0.16s ease, border-color 0.16s ease;
}

.bk-post-list .bk-post-item:hover {
    transform: translateY(-4px);
    border-color: rgba(37, 99, 235, 0.35);
    box-shadow: 0 24px 60px rgba(15, 23, 42, 0.12);
}

.bk-post-title {
    font-size: 20px;
    margin-bottom: 10px;
}

.bk-post-meta {
    font-size: 12px;
    color: #6b7280;
    margin-bottom: 10px;
}

.bk-post-excerpt {
    font-size: 14px;
    color: #374151;
}

.bk-post-single {
    background: #ffffff;
    border-radius: 18px;
    padding: 24px;
    border: 1px solid rgba(229, 231, 235, 0.9);
    box-shadow: 0 18px 45px rgba(15, 23, 42, 0.06);
}

.bk-post-single .bk-post-title {
    margin-bottom: 10px;
}

.bk-post-single .bk-post-content {
    margin-top: 18px;
    font-size: 15px;
    color: #111827;
}

.bk-comments {
    margin-top: 24px;
}

.bk-comment-msg {
    margin-bottom: 12px;
    color: #166534;
}

.bk-comment-list {
    list-style: none;
    margin-top: 10px;
}

.bk-comment-item {
    background: #ffffff;
    border-radius: 10px;
    padding: 10px 14px;
    margin-bottom: 10px;
    border: 1px solid rgba(229, 231, 235, 0.9);
}

.bk-comment-author {
    font-weight: bold;
    font-size: 14px;
    margin-bottom: 4px;
}

.bk-comment-date {
    font-weight: normal;
    font-size: 12px;
    color: #777777;
    margin-left: 8px;
}

.bk-comment-content {
    font-size: 14px;
}

.bk-comment-form {
    background: #ffffff;
    border-radius: 14px;
    padding: 18px 18px 20px;
    margin-top: 16px;
    box-shadow: 0 14px 38px rgba(15, 23, 42, 0.06);
}

.bk-form-group {
    margin-bottom: 12px;
}

.bk-form-group label {
    display: block;
    margin-bottom: 4px;
    font-size: 14px;
}

.bk-form-group input[type="text"],
.bk-form-group textarea {
    width: 100%;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    padding: 8px;
    font-size: 14px;
    background-color: #f9fafb;
    transition: border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}

.bk-form-group input[type="text"]:focus,
.bk-form-group textarea:focus {
    outline: none;
    border-color: #2563eb;
    background-color: #ffffff;
    box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.4);
}

.bk-form-group button {
    padding: 9px 18px;
    border: none;
    border-radius: 999px;
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    color: #ffffff;
    cursor: pointer;
    font-size: 14px;
}

.bk-form-group button:hover {
    background: linear-gradient(135deg, #1d4ed8, #1e40af);
    box-shadow: 0 10px 25px rgba(37, 99, 235, 0.35);
}

.bk-pagination {
    margin-top: 16px;
    text-align: center;
}

.bk-pagination a,
.bk-pagination span {
    display: inline-block;
    padding: 6px 10px;
    margin: 0 3px;
    border-radius: 999px;
    border: 1px solid rgba(209, 213, 219, 0.9);
    font-size: 13px;
}

.bk-pagination .current {
    background-color: #2563eb;
    color: #ffffff;
    border-color: #2563eb;
}

.bk-footer {
    background: transparent;
    padding: 18px 0 24px;
    text-align: center;
    font-size: 13px;
    color: #6b7280;
}

/* 后台样式（简化版本） */
.bk-admin-body {
    min-height: 100vh;
    background: radial-gradient(circle at top, #e0f2fe, #eff6ff 40%, #f9fafb 75%);
}

.bk-admin-header {
    background: rgba(15, 23, 42, 0.96);
    color: #ffffff;
    padding: 10px 0;
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.4);
}

.bk-admin-header .bk-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.bk-admin-header a {
    color: #ffffff;
    margin-left: 12px;
    font-size: 13px;
    padding: 5px 10px;
    border-radius: 999px;
    background: rgba(148, 163, 184, 0.18);
}

.bk-admin-header a:hover {
    background: rgba(37, 99, 235, 0.6);
}

.bk-admin-main {
    padding: 24px 0 40px;
}

.bk-admin-card {
    background: #ffffff;
    border-radius: 18px;
    padding: 20px 20px 22px;
    box-shadow: 0 20px 55px rgba(15, 23, 42, 0.16);
    margin-bottom: 18px;
    border: 1px solid rgba(229, 231, 235, 0.9);
}

.bk-admin-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.bk-admin-table th,
.bk-admin-table td {
    border: 1px solid rgba(229, 231, 235, 0.95);
    padding: 9px 10px;
}

.bk-admin-table th {
    background-color: #f3f4f6;
    font-weight: 600;
}

.bk-admin-actions a {
    margin-right: 8px;
    color: #2563eb;
    font-size: 13px;
}

.bk-admin-login {
    max-width: 380px;
    margin: 80px auto 40px;
    text-align: left;
    position: relative;
}

.bk-admin-login h1 {
    text-align: left;
    margin-bottom: 6px;
    font-size: 24px;
}

.bk-admin-login-subtitle {
    font-size: 13px;
    color: #6b7280;
    margin-bottom: 18px;
}

.bk-auth-logo {
    display: flex;
    align-items: center;
    margin-bottom: 16px;
}

.bk-auth-logo-icon {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: radial-gradient(circle at 30% 0, #38bdf8, #0f172a);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #e5f3ff;
    font-weight: 700;
    font-size: 20px;
    margin-right: 12px;
    box-shadow: 0 16px 40px rgba(15, 23, 42, 0.4);
}

.bk-auth-logo-text {
    font-size: 18px;
    font-weight: 600;
    color: #0f172a;
}

.bk-message {
    padding: 8px 10px;
    border-radius: 8px;
    margin-bottom: 10px;
    font-size: 13px;
}

.bk-message-error {
    background-color: #fce8e6;
    color: #b91c1c;
}

.bk-message-success {
    background-color: #e6f4ea;
    color: #15803d;
}