/* ============================================================
   问题不大 - 个人博客前台样式
   设计基调：极简 · 黑白灰 · 桌面优先 · 响应式适配
   ============================================================ */

:root {
    --color-bg: #ffffff;
    --color-bg-soft: #f7f7f8;
    --color-bg-hover: #fafafa;
    --color-text: #2b2b2b;
    --color-text-secondary: #7a7a7a;
    --color-text-light: #b0b0b0;
    --color-border: #e8e8e8;
    --color-border-strong: #d9d9d9;
    --color-accent: #2b2b2b;
    --color-link: #2b2b2b;
    --color-link-hover: #000000;
    --color-code-bg: #f6f7f9;
    --color-danger: #d9534f;
    --max-width: 760px;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --shadow-card: 0 2px 16px rgba(0, 0, 0, 0.05);
    --shadow-card-hover: 0 6px 28px rgba(0, 0, 0, 0.09);
}

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

html {
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.8;
    font-size: 15px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

a {
    color: var(--color-link);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-link-hover);
}

/* ==================== 顶部头部 ==================== */
.site-header {
    position: relative;
    padding: 48px 20px 28px;
    text-align: center;
    background: linear-gradient(180deg, #fbfbfb 0%, #ffffff 100%);
    border-bottom: 1px solid var(--color-border);
}

.site-title {
    font-size: 32px;
    font-weight: 700;
    letter-spacing: 6px;
    margin-bottom: 8px;
    color: var(--color-text);
    cursor: pointer;
    user-select: none;
    transition: opacity 0.2s ease;
}

.site-title:hover {
    opacity: 0.7;
}

.site-subtitle {
    font-size: 13px;
    color: var(--color-text-secondary);
    letter-spacing: 2px;
}

/* 右上角用户区 */
.top-right {
    position: absolute;
    top: 26px;
    right: 32px;
    font-size: 13px;
    color: var(--color-text-secondary);
}

.top-right a {
    color: var(--color-text-secondary);
    padding: 4px 2px;
    border-bottom: 1px solid transparent;
    transition: color 0.2s ease, border-color 0.2s ease;
}

.top-right a:hover {
    color: var(--color-text);
    border-bottom-color: var(--color-text);
}

.top-right .sep {
    margin: 0 8px;
    color: var(--color-border-strong);
}

/* ==================== 导航菜单（吸顶） ==================== */
.nav-bar {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    padding: 0 20px;
    height: 52px;
    border-bottom: 1px solid var(--color-border);
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-item {
    position: relative;
    font-size: 14px;
    color: var(--color-text-secondary);
    cursor: pointer;
    line-height: 52px;
    transition: color 0.2s ease;
    user-select: none;
    white-space: nowrap;
}

.nav-item::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 2px;
    background: var(--color-accent);
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 0.25s ease;
}

.nav-item:hover,
.nav-item.active {
    color: var(--color-text);
}

.nav-item:hover::after,
.nav-item.active::after {
    transform: scaleX(1);
}

/* ==================== 主体内容 ==================== */
.main-content {
    flex: 1;
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 36px 24px;
}

/* ==================== 文章列表 ==================== */
.article-list {
    list-style: none;
}

.article-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 12px;
    margin: 0 -12px;
    border-radius: var(--radius-md);
    border-bottom: 1px solid var(--color-border);
    transition: background 0.2s ease, padding 0.2s ease;
}

.article-item:hover {
    background: var(--color-bg-hover);
    padding-left: 18px;
    padding-right: 6px;
}

.article-item .article-title {
    font-size: 15px;
    color: var(--color-text);
    cursor: pointer;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    transition: color 0.2s ease;
}

.article-item .article-title:hover {
    color: var(--color-link-hover);
}

.article-item .article-time {
    font-size: 13px;
    color: var(--color-text-light);
    white-space: nowrap;
    margin-left: 20px;
    flex-shrink: 0;
}

.article-type-badge {
    display: inline-block;
    font-size: 11px;
    line-height: 1.6;
    color: var(--color-text-secondary);
    background: var(--color-bg-soft);
    border: 1px solid var(--color-border);
    padding: 1px 7px;
    border-radius: 10px;
    margin-right: 8px;
    vertical-align: middle;
}

/* ==================== 文章详情 ==================== */
.article-detail {
    flex: 1;
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 36px 24px;
}

.article-detail-title {
    font-size: 28px;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 10px;
    word-break: break-word;
}

.article-detail-meta {
    font-size: 13px;
    color: var(--color-text-light);
    margin-bottom: 32px;
    padding-bottom: 22px;
    border-bottom: 1px solid var(--color-border);
}

/* Markdown 正文排版 */
.article-content {
    font-size: 15.5px;
    line-height: 1.9;
    color: var(--color-text);
    word-break: break-word;
}

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4 {
    margin-top: 1.6em;
    margin-bottom: 0.8em;
    font-weight: 600;
    line-height: 1.4;
}

.article-content h1 { font-size: 1.55em; }
.article-content h2 { font-size: 1.3em; padding-bottom: 0.3em; border-bottom: 1px solid var(--color-border); }
.article-content h3 { font-size: 1.12em; }
.article-content h4 { font-size: 1.0em; }

.article-content p {
    margin-bottom: 1.1em;
}

.article-content a {
    color: #3b6ea5;
    text-decoration: none;
    border-bottom: 1px solid rgba(59, 110, 165, 0.35);
    transition: border-color 0.2s ease;
}

.article-content a:hover {
    border-bottom-color: #3b6ea5;
}

.article-content strong {
    font-weight: 600;
}

.article-content code {
    font-family: "SF Mono", "Fira Code", "Consolas", "Monaco", monospace;
    background: var(--color-code-bg);
    border: 1px solid var(--color-border);
    padding: 1px 7px;
    border-radius: var(--radius-sm);
    font-size: 0.88em;
    color: #c7254e;
}

.article-content pre {
    background: var(--color-code-bg);
    border: 1px solid var(--color-border);
    padding: 18px 20px;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin-bottom: 1.2em;
    line-height: 1.7;
}

.article-content pre code {
    background: none;
    border: none;
    padding: 0;
    color: var(--color-text);
    font-size: 13.5px;
}

.article-content blockquote {
    border-left: 3px solid var(--color-border-strong);
    padding: 6px 0 6px 18px;
    margin: 1.2em 0;
    color: var(--color-text-secondary);
    background: var(--color-bg-soft);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.article-content blockquote p {
    margin-bottom: 0.4em;
}

.article-content blockquote p:last-child {
    margin-bottom: 0;
}

.article-content ul,
.article-content ol {
    padding-left: 26px;
    margin-bottom: 1.1em;
}

.article-content li {
    margin-bottom: 0.3em;
}

.article-content hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 2em 0;
}

.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.2em;
    font-size: 0.95em;
    display: block;
    overflow-x: auto;
}

.article-content th,
.article-content td {
    border: 1px solid var(--color-border);
    padding: 9px 14px;
    text-align: left;
}

.article-content th {
    background: var(--color-bg-soft);
    font-weight: 600;
}

.article-content img {
    max-width: 100%;
    border-radius: var(--radius-md);
}

/* 隐藏内容区域 */
.article-private-section {
    margin-bottom: 32px;
    padding: 24px 24px 20px;
    background: var(--color-bg-soft);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--color-accent);
}

.article-private-section .private-title {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--color-text);
}

.article-private-section .private-content {
    font-size: 14px;
    color: var(--color-text);
    line-height: 1.8;
}

.article-private-section .private-content code {
    font-family: "SF Mono", "Fira Code", "Consolas", monospace;
    background: #fff;
    border: 1px solid var(--color-border);
    padding: 1px 6px;
    border-radius: var(--radius-sm);
    font-size: 0.9em;
}

.article-login-tip {
    margin-bottom: 32px;
    padding: 22px 20px;
    background: var(--color-bg-soft);
    border: 1px dashed var(--color-border-strong);
    border-radius: var(--radius-md);
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 14px;
}

.article-login-tip a {
    color: var(--color-text);
    text-decoration: none;
    border-bottom: 1px solid var(--color-text);
    padding-bottom: 1px;
}

.article-login-tip a:hover {
    color: var(--color-link-hover);
}

/* ==================== 底部 ==================== */
.site-footer {
    text-align: center;
    padding: 28px 20px;
    border-top: 1px solid var(--color-border);
    font-size: 13px;
    color: var(--color-text-light);
    background: var(--color-bg-soft);
}

.site-footer a {
    color: var(--color-text-light);
}

.site-footer a:hover {
    color: var(--color-text-secondary);
}

/* ==================== 登录 / 改密页面 ==================== */
.auth-container {
    flex: 1;
    width: 100%;
    max-width: 400px;
    margin: 48px auto;
    padding: 36px 32px 28px;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
}

.auth-title {
    font-size: 20px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 28px;
    letter-spacing: 2px;
}

.auth-container .layui-form-item {
    margin-bottom: 18px;
}

/* 无 label 的表单：清除 Layui 默认的 label 预留宽度，避免整体右偏 */
.auth-container .layui-input-block {
    margin-left: 0;
}

.auth-container .layui-input {
    height: 42px;
    line-height: 42px;
    border-radius: var(--radius-md);
    border-color: var(--color-border);
    font-size: 14px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.auth-container .layui-input:focus {
    border-color: var(--color-text) !important;
    box-shadow: 0 0 0 3px rgba(43, 43, 43, 0.06) !important;
}

.auth-container .layui-btn {
    width: 100%;
    height: 42px;
    line-height: 42px;
    background: var(--color-text);
    border-color: var(--color-text);
    border-radius: var(--radius-md);
    font-size: 14px;
    letter-spacing: 2px;
    transition: background 0.2s ease, transform 0.1s ease;
}

.auth-container .layui-btn:hover {
    background: var(--color-link-hover);
    transform: translateY(-1px);
}

.auth-container .layui-btn:active {
    transform: translateY(0);
}

.auth-back {
    text-align: center;
    margin-top: 20px;
    font-size: 13px;
}

.auth-back a {
    color: var(--color-text-light);
    transition: color 0.2s ease;
}

.auth-back a:hover {
    color: var(--color-text);
}

/* ==================== 响应式适配 ==================== */

/* 平板 / 中等屏幕 */
@media (max-width: 1024px) {
    .article-detail-title {
        font-size: 25px;
    }
}

/* 手机横屏 / 平板竖屏 */
@media (max-width: 768px) {
    .site-header {
        padding: 36px 16px 22px;
    }

    .site-title {
        font-size: 26px;
        letter-spacing: 4px;
    }

    .top-right {
        position: static;
        text-align: center;
        margin-bottom: 12px;
        font-size: 12.5px;
    }

    .top-right .sep {
        margin: 0 6px;
    }

    .nav-bar {
        gap: 24px;
        height: auto;
        min-height: 44px;
        overflow-x: auto;
        justify-content: flex-start;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }

    .nav-bar::-webkit-scrollbar {
        display: none;
    }

    .nav-item {
        line-height: 44px;
        flex-shrink: 0;
    }

    .main-content,
    .article-detail {
        padding: 24px 18px;
    }

    .article-item {
        padding: 14px 10px;
        margin: 0 -10px;
    }

    .article-item:hover {
        padding-left: 14px;
        padding-right: 6px;
    }

    .article-item .article-time {
        font-size: 12px;
    }

    .article-detail-title {
        font-size: 22px;
    }

    .article-content {
        font-size: 15px;
    }

    .auth-container {
        margin: 28px auto;
        padding: 28px 22px 22px;
        max-width: 100%;
        width: calc(100% - 32px);
        box-shadow: none;
        border-radius: var(--radius-md);
    }
}

/* 小屏手机 */
@media (max-width: 480px) {
    body {
        font-size: 14px;
    }

    .site-title {
        font-size: 24px;
        letter-spacing: 3px;
    }

    .site-subtitle {
        font-size: 12px;
        letter-spacing: 1px;
    }

    .article-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }

    .article-item .article-title {
        max-width: 100%;
        white-space: normal;
        word-break: break-all;
    }

    .article-item .article-time {
        margin-left: 0;
        font-size: 12px;
    }

    .article-detail-title {
        font-size: 20px;
    }

    .article-content pre {
        padding: 14px 14px;
        font-size: 12.5px;
    }
}

/* 大屏适配：内容宽度上限 */
@media (min-width: 1600px) {
    :root {
        --max-width: 820px;
    }
}