/* ============================================================
   BLOG — 黑白灰极简 · 直角线条
   ============================================================ */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
:root {
    --black:#111; --white:#fff;
    --gray-100:#f5f5f5; --gray-200:#e5e5e5; --gray-300:#d4d4d4;
    --gray-400:#a3a3a3; --gray-500:#737373; --gray-600:#525252;
    --gray-700:#404040; --gray-800:#262626; --gray-900:#171717;
    --border:1px solid var(--gray-300);
    --border-dark:1px solid var(--gray-800);
}
html { font-size:16px; -webkit-font-smoothing:antialiased; }
body {
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
    color:var(--gray-900); background:var(--white); line-height:1.7;
    min-height:100vh; display:flex; flex-direction:column;
}
a { color:var(--gray-900); text-decoration:none; border-bottom:1px solid var(--gray-400); transition:border-color .15s; }
a:hover { border-bottom-color:var(--gray-900); }

.site-header { border-bottom:var(--border-dark); background:var(--white); position:sticky; top:0; z-index:100; }
.header-inner { max-width:1100px; margin:0 auto; padding:0 16px; height:56px; display:flex; align-items:center; justify-content:space-between; }
.logo { font-size:1.25rem; font-weight:700; letter-spacing:.08em; border-bottom:none; color:var(--gray-900); text-transform:uppercase; }
.header-nav { display:flex; align-items:center; gap:12px; font-size:.9rem; }
.nav-link { border-bottom:none; color:var(--gray-600); padding:4px 0; transition:color .15s; }
.nav-link:hover, .nav-link.active { color:var(--gray-900); }
.nav-sep { color:var(--gray-300); user-select:none; }
.nav-user { color:var(--gray-500); font-size:.85rem; }

.site-main { flex:1; max-width:1100px; width:100%; margin:0 auto; padding:40px 16px 60px; }
.container { width:100%; }
.page-title { font-size:1.75rem; font-weight:700; margin-bottom:32px; padding-bottom:12px; border-bottom:var(--border-dark); letter-spacing:-.02em; }

.flash-container { max-width:1100px; margin:0 auto; padding:12px 16px 0; }
.flash { padding:10px 16px; margin-bottom:8px; border-left:3px solid; font-size:.9rem; }
.flash-success { background:var(--gray-100); border-color:var(--gray-900); color:var(--gray-900); }
.flash-error { background:#fef2f2; border-color:#dc2626; color:#991b1b; }
.flash-info { background:var(--gray-100); border-color:var(--gray-500); color:var(--gray-700); }

/* Post List */
.post-list { display:flex; flex-direction:column; }
.post-card { border-bottom:var(--border); padding:24px 0; transition:background .12s; }
.post-card:first-child { border-top:var(--border); }
.post-card:hover { background:var(--gray-100); }
.post-card-link { display:block; border-bottom:none; color:inherit; }
.post-card-title { font-size:1.2rem; font-weight:600; margin-bottom:8px; color:var(--gray-900); }
.post-card-time { font-family:"SF Mono","Fira Code",Consolas,monospace; font-size:.8rem; color:var(--gray-400); display:block; margin-bottom:10px; }
.post-card-summary { font-size:.95rem; color:var(--gray-600); line-height:1.65; }

.pagination { display:flex; align-items:center; justify-content:center; gap:16px; padding:32px 0 0; }
.page-btn { color:var(--gray-700); border-bottom:none; padding:6px 14px; border:var(--border); font-size:.9rem; transition:all .15s; }
.page-btn:hover { background:var(--gray-900); color:var(--white); border-color:var(--gray-900); }
.page-info { font-family:"SF Mono","Fira Code",Consolas,monospace; font-size:.85rem; color:var(--gray-500); }

/* Article */
.article-header { margin-bottom:24px; }
.article-title { font-size:1.75rem; font-weight:700; margin-bottom:8px; letter-spacing:-.02em; line-height:1.35; }
.article-time { font-family:"SF Mono","Fira Code",Consolas,monospace; font-size:.85rem; color:var(--gray-400); }
.divider { border:none; border-top:var(--border); margin:24px 0; }

/* Docx Content */
.docx-content { font-size:1.05rem; line-height:1.85; color:var(--gray-800); }
.docx-content .docx-h1 { font-size:1.5rem; font-weight:700; margin:28px 0 16px; padding-bottom:8px; border-bottom:var(--border-dark); }
.docx-content .docx-h2 { font-size:1.25rem; font-weight:700; margin:24px 0 12px; }
.docx-content .docx-h3 { font-size:1.1rem; font-weight:600; margin:20px 0 10px; }
.docx-content .docx-p { margin-bottom:14px; text-align:justify; }
.docx-content .docx-table { background:var(--gray-100); padding:16px; font-size:.9rem; overflow-x:auto; white-space:pre; margin-bottom:14px; border-left:3px solid var(--gray-300); }
.docx-content .error { color:#dc2626; font-style:italic; }
.docx-content strong { color:var(--gray-900); }
.docx-content em { color:var(--gray-600); }

/* Comments */
.comments-section { margin-top:40px; }
.comments-title { font-size:1.2rem; font-weight:600; margin-bottom:20px; }
.comment-form textarea { width:100%; padding:10px 14px; border:var(--border); font-family:inherit; font-size:.95rem; resize:vertical; min-height:80px; background:var(--white); color:var(--gray-900); outline:none; transition:border-color .15s; }
.comment-form textarea:focus { border-color:var(--gray-900); }
.comment-form .btn { margin-top:8px; }
.comment-login-hint { color:var(--gray-500); font-size:.9rem; margin-bottom:24px; }
.comment-login-hint a { color:var(--gray-900); border-bottom-color:var(--gray-900); }
.comment-list { list-style:none; }
.comment-item { padding:16px 0; border-bottom:var(--border); }
.comment-item:first-child { border-top:var(--border); }
.comment-meta { display:flex; align-items:center; gap:12px; margin-bottom:8px; flex-wrap:wrap; }
.comment-author { font-weight:600; font-size:.9rem; color:var(--gray-800); }
.comment-time { font-family:"SF Mono","Fira Code",Consolas,monospace; font-size:.75rem; color:var(--gray-400); }
.comment-content { font-size:.95rem; color:var(--gray-700); line-height:1.65; white-space:pre-wrap; }
.comment-delete-form { margin-left:auto; }

/* Auth */
.auth-container { max-width:400px; margin:40px auto 0; padding:32px; border:var(--border); background:var(--white); }
.auth-title { font-size:1.5rem; font-weight:700; margin-bottom:28px; text-align:center; letter-spacing:-.02em; }
.auth-form .form-group { margin-bottom:18px; }
.auth-switch { text-align:center; margin-top:20px; font-size:.9rem; color:var(--gray-500); }
.captcha-group label { font-family:"SF Mono","Fira Code",Consolas,monospace; font-size:1rem!important; letter-spacing:.03em; }

/* Forms */
.form-group { margin-bottom:18px; }
.form-group label { display:block; font-size:.9rem; font-weight:600; margin-bottom:6px; color:var(--gray-700); }
.form-group input[type="text"],
.form-group input[type="password"],
.form-group textarea { width:100%; padding:10px 14px; border:var(--border); font-family:inherit; font-size:.95rem; background:var(--white); color:var(--gray-900); outline:none; transition:border-color .15s; }
.form-group input:focus, .form-group textarea:focus { border-color:var(--gray-900); }
.form-group input[type="file"] { font-size:.9rem; color:var(--gray-600); }
.form-hint { display:block; font-size:.8rem; color:var(--gray-400); margin-top:4px; }
.required { color:#dc2626; }
.form-check { display:flex; align-items:center; gap:8px; }
.form-check input[type="checkbox"] { width:18px; height:18px; accent-color:var(--gray-900); }
.form-check label { margin-bottom:0!important; font-weight:400; }
.form-actions { display:flex; gap:10px; margin-top:24px; }

/* Buttons */
.btn { display:inline-block; padding:8px 20px; font-size:.9rem; font-family:inherit; font-weight:500; cursor:pointer; border:var(--border); background:var(--white); color:var(--gray-800); transition:all .15s; text-align:center; }
.btn:hover { background:var(--gray-100); }
.btn-dark { background:var(--gray-900); color:var(--white); border-color:var(--gray-900); }
.btn-dark:hover { background:var(--gray-700); border-color:var(--gray-700); }
.btn-sm { padding:4px 12px; font-size:.8rem; }
.btn-danger { color:#dc2626; border-color:#fecaca; }
.btn-danger:hover { background:#fef2f2; border-color:#dc2626; }
.btn-ghost { border-color:transparent; color:var(--gray-500); }
.btn-ghost:hover { background:var(--gray-100); color:var(--gray-700); }
.btn-full { width:100%; }
.btn-link-danger { background:none; border:none; color:#dc2626; font-size:.8rem; cursor:pointer; text-decoration:underline; padding:0; font-family:inherit; }
.btn-link-danger:hover { color:#991b1b; }
.inline-form { display:inline; }

/* Admin */
.admin-header { display:flex; align-items:center; justify-content:space-between; margin-bottom:24px; }
.admin-header .page-title { margin-bottom:0; padding-bottom:0; border-bottom:none; }
.admin-table { width:100%; border-collapse:collapse; font-size:.9rem; }
.admin-table thead { border-bottom:var(--border-dark); }
.admin-table th { text-align:left; padding:10px 12px; font-weight:600; color:var(--gray-600); font-size:.8rem; text-transform:uppercase; letter-spacing:.05em; }
.admin-table td { padding:14px 12px; border-bottom:var(--border); vertical-align:top; }
.admin-table .actions { display:flex; gap:8px; flex-wrap:wrap; }
.badge { display:inline-block; padding:2px 8px; font-size:.75rem; font-weight:600; }
.badge-published { background:var(--gray-900); color:var(--white); }
.badge-draft { background:var(--gray-200); color:var(--gray-600); }
.text-muted { color:var(--gray-400); }

.empty-state { text-align:center; padding:60px 20px; color:var(--gray-400); }
.empty-state p { font-size:1.1rem; margin-bottom:20px; }
.back-link { margin-top:40px; padding-top:20px; border-top:var(--border); }
.back-link a { font-size:.9rem; color:var(--gray-500); border-bottom:none; }
.back-link a:hover { color:var(--gray-900); }
.post-form { max-width:650px; }

.site-footer { border-top:var(--border-dark); padding:20px; margin-top:auto; }
.footer-inner { max-width:1100px; margin:0 auto; text-align:center; font-size:.8rem; color:var(--gray-400); }

@media (max-width:640px) {
    .header-inner { padding:0 16px; }
    .site-main { padding:24px 16px 40px; }
    .admin-table thead { display:none; }
    .admin-table tr { display:block; margin-bottom:16px; border:var(--border); }
    .admin-table td { display:block; padding:8px 12px; border-bottom:none; }
    .admin-table td:not(:last-child) { border-bottom:1px solid var(--gray-200); }
}