/* ============ 我的空间 · 深色科技风 ============ */
:root {
    --bg: #0a0e17;
    --bg-soft: #0f1522;
    --surface: #131a26;
    --surface-hover: #182234;
    --border: #1f2937;
    --border-light: #27344a;
    --text: #e5e7eb;
    --text-muted: #9ca3af;
    --text-dim: #6b7280;
    --accent: #22d3ee;
    --accent-2: #818cf8;
    --accent-glow: rgba(34, 211, 238, 0.15);
    --success: #34d399;
    --danger: #f87171;
    --warning: #fbbf24;
    --radius: 12px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 流星/烟花特效画布：置于背景之上、内容之下 */
#fx {
    position: fixed;
    left: 0;
    top: 0;
    pointer-events: none;
    z-index: -1;
}

/* 背景：深色科技风底图 */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    background-color: var(--bg);
    background-image: url("../img/bg.svg");
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    pointer-events: none;
    z-index: -1;
}

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: #67e8f9; }

/* ============ 导航栏 ============ */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 14, 23, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.nav {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
    height: 60px;
    display: flex;
    align-items: center;
    gap: 24px;
}

.brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.brand::before {
    content: "▶";
    color: var(--accent);
    font-size: 0.8rem;
    animation: blink 1.6s infinite;
}

@keyframes blink { 50% { opacity: 0.3; } }

.brand span {
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 4px;
    flex: 1;
}

.nav-links a {
    color: var(--text-muted);
    padding: 8px 14px;
    border-radius: 8px;
    font-size: 0.95rem;
    position: relative;
}

.nav-links a:hover { color: var(--text); background: var(--surface); }

.nav-links a.active { color: var(--accent); }
.nav-links a.active::after {
    content: "";
    position: absolute;
    bottom: 2px;
    left: 14px;
    right: 14px;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    border-radius: 2px;
}

.nav-auth {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.9rem;
}

.user-name {
    color: var(--text);
    border: 1px solid var(--border-light);
    padding: 4px 12px;
    border-radius: 20px;
    background: var(--surface);
}

/* 导航右侧的分隔竖线 */
.nav-divider {
    width: 1px;
    height: 22px;
    background: var(--border);
    margin: 0 4px;
    flex-shrink: 0;
}

/* 让「退出」等按钮看起来像链接 */
.link-btn {
    background: none;
    border: none;
    padding: 0;
    color: var(--accent);
    font-size: 0.9rem;
    cursor: pointer;
    font-family: inherit;
    transition: color 0.2s;
}

.link-btn:hover { color: #67e8f9; }

/* ============ 按钮 ============ */
.btn {
    display: inline-block;
    padding: 9px 20px;
    border-radius: 8px;
    border: 1px solid var(--border-light);
    background: var(--surface);
    color: var(--text);
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

.btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 0 12px var(--accent-glow);
}

.btn-primary {
    background: linear-gradient(90deg, #0ea5b7, var(--accent-2));
    border: none;
    color: #fff;
    font-weight: 600;
}

.btn-primary:hover {
    color: #fff;
    box-shadow: 0 0 20px rgba(34, 211, 238, 0.35);
    transform: translateY(-1px);
}

.btn-danger { border-color: rgba(248, 113, 113, 0.4); color: var(--danger); }
.btn-danger:hover { border-color: var(--danger); color: var(--danger); }

.btn-sm { padding: 5px 12px; font-size: 0.85rem; }
.btn-block { display: block; width: 100%; }

/* ============ 主容器 ============ */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 32px 20px;
    flex: 1;
    width: 100%;
}

/* ============ 首页 Hero ============ */
.hero {
    text-align: center;
    padding: 60px 20px 40px;
    position: relative;
}

.hero h1 {
    font-size: 2.6rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: 1px;
}

.hero h1 .grad {
    background: linear-gradient(90deg, var(--accent), var(--accent-2), #c084fc);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 640px;
    margin: 0 auto 28px;
}

.hero-code {
    display: inline-block;
    font-family: "JetBrains Mono", "Consolas", monospace;
    font-size: 0.85rem;
    color: var(--accent);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px 18px;
    margin-top: 8px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 36px;
    flex-wrap: wrap;
}

.stat { text-align: center; }
.stat .num {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent);
    font-family: "Consolas", monospace;
}
.stat .label { color: var(--text-dim); font-size: 0.85rem; }

/* 首页：整页一屏、不滚动。body.home 固定为 100vh，内部用 flexbox 分配剩余高度，
   这样 footer 加高（如备案号）也不会把内容顶出视口产生滚动条 */
body.home {
    height: 100vh;
    overflow: hidden;
}

/* 首页 main 也要成为 flex 列，这样 .home-wrap 才能用 flex:1 撑满剩余空间，
   底部状态数字贴到 footer 上方，整页一屏 */
body.home .container {
    display: flex;
    flex-direction: column;
}

/* 首页：hero 撑满，统计数字（原样式，缩小）放底部 */
.home-wrap {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0; /* 允许收缩，避免溢出 */
}

.home-wrap .hero {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding-bottom: 16px;
    transform: translateY(-8vh); /* 欢迎语整体上移一点 */
}

.home-stats {
    display: flex;
    justify-content: center;
    gap: 36px;
    flex-wrap: wrap;
    padding-bottom: 8px;
}

.home-stats .num { font-size: 1.3rem; }
.home-stats .label { font-size: 0.72rem; }

/* ============ 区块标题 ============ */
.section-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2rem;
    font-weight: 700;
    margin: 40px 0 20px;
}

.section-title::before {
    content: "// ";
    color: var(--accent);
    font-family: "Consolas", monospace;
}

.section-title .more {
    margin-left: auto;
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--text-dim);
}

.section-title .more:hover { color: var(--accent); }

/* ============ 卡片 ============ */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px;
    transition: all 0.25s;
    position: relative;
    overflow: hidden;
}

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

.card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.card h3 a { color: var(--text); }
.card h3 a:hover { color: var(--accent); }

.card .meta {
    color: var(--text-dim);
    font-size: 0.82rem;
    margin-bottom: 10px;
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.card .summary {
    color: var(--text-muted);
    font-size: 0.92rem;
}

.tag {
    display: inline-block;
    font-size: 0.75rem;
    padding: 2px 10px;
    border-radius: 20px;
    border: 1px solid var(--border-light);
    color: var(--accent);
    background: var(--accent-glow);
}

.tag-teaching { color: #c084fc; background: rgba(192, 132, 252, 0.12); border-color: rgba(192,132,252,0.3); }
.tag-hobby { color: #34d399; background: rgba(52, 211, 153, 0.1); border-color: rgba(52,211,153,0.3); }

/* ============ 文章详情 ============ */
.article {
    max-width: 760px;
    margin: 0 auto;
}

.article-header {
    text-align: center;
    margin-bottom: 32px;
}

.article-header h1 {
    font-size: 1.9rem;
    margin-bottom: 14px;
    line-height: 1.4;
}

.article-meta {
    color: var(--text-dim);
    font-size: 0.9rem;
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.article-body {
    font-size: 1.05rem;
    line-height: 1.9;
    color: var(--text);
}

.article-body h2 { margin: 28px 0 12px; color: var(--accent); font-size: 1.3rem; }
.article-body h3 { margin: 22px 0 10px; font-size: 1.15rem; }
.article-body p { margin-bottom: 16px; }
.article-body img { max-width: 100%; border-radius: 8px; border: 1px solid var(--border); }
.article-body blockquote {
    border-left: 3px solid var(--accent);
    padding: 10px 18px;
    margin: 16px 0;
    background: var(--bg-soft);
    color: var(--text-muted);
    border-radius: 0 8px 8px 0;
}
.article-body code {
    font-family: "Consolas", monospace;
    background: var(--bg-soft);
    border: 1px solid var(--border);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--accent);
}
.article-body pre {
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    overflow-x: auto;
    margin: 16px 0;
}
.article-body pre code { border: none; padding: 0; background: none; color: var(--text); }

/* ============ 列表页 ============ */
.page-title {
    font-size: 1.8rem;
    margin-bottom: 8px;
}

.page-sub { color: var(--text-muted); margin-bottom: 28px; }

/* ============ 表单 ============ */
.form-card {
    max-width: 480px;
    margin: 20px auto;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
}

.form-card h2 { margin-bottom: 24px; text-align: center; }

.form-group { margin-bottom: 20px; }

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.form-group .help-text {
    font-size: 0.8rem;
    color: var(--text-dim);
    margin-top: 4px;
}

.form-input {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

textarea.form-input { min-height: 140px; resize: vertical; }

.form-errors {
    color: var(--danger);
    font-size: 0.85rem;
    margin: 6px 0;
    list-style: none;
}

/* ============ 提示消息 ============ */
.alert {
    padding: 12px 18px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 0.92rem;
    border: 1px solid var(--border);
}

.alert-success { color: var(--success); background: rgba(52, 211, 153, 0.08); border-color: rgba(52,211,153,0.3); }
.alert-error, .alert-danger { color: var(--danger); background: rgba(248, 113, 113, 0.08); border-color: rgba(248,113,113,0.3); }
.alert-info { color: var(--accent); background: rgba(34, 211, 238, 0.08); border-color: rgba(34,211,238,0.3); }
.alert-warning { color: var(--warning); background: rgba(251, 191, 36, 0.08); border-color: rgba(251,191,36,0.3); }

/* ============ 讨论区 ============ */
.forum-table {
    width: 100%;
    border-collapse: collapse;
}

.forum-table th {
    text-align: left;
    padding: 12px;
    color: var(--text-dim);
    font-size: 0.85rem;
    border-bottom: 1px solid var(--border);
    font-weight: 500;
}

.forum-table td {
    padding: 16px 12px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

.forum-table tr:hover td { background: var(--bg-soft); }

.forum-row-title { font-weight: 600; }
.forum-row-title a { color: var(--text); }
.forum-row-title a:hover { color: var(--accent); }

.num { font-family: "Consolas", monospace; color: var(--text-muted); text-align: center; }
.pin { color: var(--warning); font-size: 0.8rem; }

/* ============ 回复列表 ============ */
.reply-list { margin-top: 24px; }

.reply-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 18px 22px;
    margin-bottom: 14px;
}

.reply-item .reply-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.reply-item .reply-author {
    font-weight: 600;
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 8px;
}

.role-badge {
    font-size: 0.7rem;
    padding: 1px 8px;
    border-radius: 10px;
    border: 1px solid var(--border-light);
}
.role-teacher { color: #c084fc; border-color: rgba(192,132,252,0.4); }
.role-student { color: var(--accent); border-color: rgba(34,211,238,0.4); }

.reply-item .reply-time { color: var(--text-dim); font-size: 0.8rem; }
.reply-actions { display: flex; align-items: center; gap: 10px; }
.reply-item .reply-content { white-space: pre-wrap; }

/* ============ 页脚 ============ */
.site-footer {
    border-top: 1px solid var(--border);
    padding: 24px 20px;
    text-align: center;
    color: var(--text-dim);
    font-size: 0.85rem;
}

.site-footer .footer-icp {
    margin-top: 8px;
    font-size: 0.8rem;
}

.site-footer .footer-icp a {
    color: var(--text-dim);
    text-decoration: none;
    transition: color 0.2s ease;
}

.site-footer .footer-icp a:hover {
    color: var(--accent);
    text-decoration: underline;
}

/* ============ 空状态 ============ */
.empty {
    text-align: center;
    color: var(--text-dim);
    padding: 60px 20px;
}

.empty .icon { font-size: 2.5rem; margin-bottom: 12px; opacity: 0.5; }

/* ============ 文章编辑器 ============ */
.article-editor { max-width: 880px; }

.editor-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    padding: 8px;
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-radius: 8px 8px 0 0;
    align-items: center;
}

.editor-toolbar button {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 5px 10px;
    border-radius: 6px;
    font-size: 0.82rem;
    cursor: pointer;
    transition: all 0.15s;
}

.editor-toolbar button:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.editor-toolbar .tb-sep {
    width: 1px;
    height: 20px;
    background: var(--border);
    margin: 0 6px;
}

.editor-area {
    min-height: 360px;
    padding: 16px;
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0 0 8px 8px;
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text);
    outline: none;
    overflow-y: auto;
}

.editor-area:focus { box-shadow: inset 0 0 0 1px var(--accent); }
.editor-area h2 { color: var(--accent); margin: 16px 0 8px; }
.editor-area h3 { margin: 12px 0 6px; }
.editor-area p { margin-bottom: 10px; }
.editor-area blockquote {
    border-left: 3px solid var(--accent);
    padding: 8px 14px;
    margin: 12px 0;
    background: var(--bg);
    color: var(--text-muted);
}
.editor-area code {
    font-family: "Consolas", monospace;
    background: var(--bg);
    border: 1px solid var(--border);
    padding: 1px 5px;
    border-radius: 4px;
    color: var(--accent);
    font-size: 0.9em;
}
.editor-area pre {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px;
    overflow-x: auto;
    margin: 12px 0;
}
.editor-area pre code { border: none; padding: 0; background: none; color: var(--text); }
.editor-area img { max-width: 100%; border-radius: 8px; }
.editor-area video { max-width: 100%; border-radius: 8px; }

/* ============ 文章正文富文本 ============ */
.rich-content video { max-width: 100%; border-radius: 8px; border: 1px solid var(--border); }
.rich-content iframe { max-width: 100%; border-radius: 8px; border: 1px solid var(--border); }
.rich-content a { text-decoration: underline; }
.rich-content ul, .rich-content ol { margin: 12px 0 12px 24px; }
.rich-content li { margin-bottom: 6px; }

/* ============ 关于我 · 诗句 ============ */
.about-poem {
    text-align: center;
    font-size: 1.15rem;
    line-height: 2.3;
    color: var(--text);
}

.about-poem .stanza { margin-bottom: 30px; }
.about-poem .stanza:last-child { margin-bottom: 0; }

.about-poem .en {
    font-family: "Consolas", "JetBrains Mono", monospace;
    color: var(--accent);
    letter-spacing: 1px;
}

/* ============ 文章评论 ============ */
.comment-section { max-width: 760px; margin: 40px auto 0; }

.comment-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px 20px;
    margin-bottom: 12px;
}

.comment-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    flex-wrap: wrap;
    gap: 8px;
}

.comment-author {
    font-weight: 600;
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 8px;
}

.comment-time { color: var(--text-dim); font-size: 0.8rem; }
.comment-content { white-space: pre-wrap; word-break: break-word; }

.comment-replies {
    margin-top: 12px;
    padding-left: 14px;
    border-left: 2px solid var(--border);
}

.comment-item-reply { background: var(--bg-soft); }

.comment-reply-toggle summary {
    cursor: pointer;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 10px;
    display: inline-block;
}

.comment-reply-toggle summary:hover { color: var(--accent); }

/* ============ 响应式 ============ */
@media (max-width: 768px) {
    .nav { flex-wrap: wrap; height: auto; padding: 12px 16px; gap: 10px; }
    .nav-links { order: 3; width: 100%; overflow-x: auto; }
    .hero h1 { font-size: 1.9rem; }
    .grid { grid-template-columns: 1fr; }
    .hero-stats { gap: 24px; }
}