/* ============================================
   CodeSpace Blog - Modern Minimalist Tech Theme
   ============================================ */

:root {
    --color-bg: #ffffff;
    --color-bg-soft: #f8f9fa;
    --color-bg-card: #ffffff;
    --color-text: #1a1a2e;
    --color-text-soft: #4a4a68;
    --color-text-muted: #8b8b9e;
    --color-primary: #2563eb;
    --color-primary-soft: #dbeafe;
    --color-primary-hover: #1d4ed8;
    --color-border: #e5e7eb;
    --color-code-bg: #f3f4f6;
    --color-code-text: #1f2937;
    --color-tag-bg: #f0f4ff;
    --color-tag-text: #2563eb;
    --color-success: #10b981;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
    --radius: 8px;
    --radius-sm: 4px;
    --max-width: 820px;
    --max-width-wide: 1100px;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;
    --transition: all 0.2s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
}

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

img {
    max-width: 100%;
    height: auto;
}

/* ===== Header ===== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.site-header .header-inner {
    max-width: var(--max-width-wide);
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.site-logo .logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--color-primary), #7c3aed);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.875rem;
    font-weight: 700;
    font-family: var(--font-mono);
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 28px;
}

.site-nav a {
    color: var(--color-text-soft);
    font-size: 0.9375rem;
    font-weight: 500;
    position: relative;
}

.site-nav a:hover,
.site-nav a.active {
    color: var(--color-primary);
}

.site-nav a.active::after {
    content: '';
    position: absolute;
    bottom: -22px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-primary);
}

/* ===== Main Layout ===== */
.site-main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 48px 24px 80px;
}

/* ===== Category Nav ===== */
.category-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 32px;
}

.category-nav-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.875rem;
    color: var(--color-text-soft);
    background: var(--color-bg-soft);
    border: 1px solid transparent;
    transition: var(--transition);
}

.category-nav-item:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.category-nav-item.active {
    background: var(--color-primary);
    color: #fff;
}

.category-nav-count {
    font-size: 0.75rem;
    opacity: 0.7;
}

/* ===== Subcategory Nav ===== */
.subcategory-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: -16px 0 24px;
}

.subcategory-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.875rem;
    color: var(--color-text-soft);
    background: var(--color-bg-soft);
    border: 1px solid transparent;
    transition: var(--transition);
}

.subcategory-item:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.subcategory-count {
    font-size: 0.75rem;
    opacity: 0.7;
}

/* ===== Article List ===== */
.article-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.article-card {
    padding: 32px 0;
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition);
}

.article-card:first-child {
    padding-top: 0;
}

.article-card:hover .article-title a {
    color: var(--color-primary);
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.article-meta .meta-date {
    display: flex;
    align-items: center;
    gap: 4px;
}

.article-meta .meta-dot {
    color: var(--color-border);
}

.article-title {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.35;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.article-title a {
    color: var(--color-text);
    transition: var(--transition);
}

.top-badge {
    display: inline-block;
    vertical-align: middle;
    margin-right: 8px;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    line-height: 1.4;
}

.top-badge.top-global {
    background: #fdece8;
    color: #e0392f;
}

.top-badge.top-category {
    background: var(--color-primary-soft);
    color: var(--color-primary);
}

.article-excerpt {
    color: var(--color-text-soft);
    font-size: 0.9375rem;
    line-height: 1.65;
    margin-bottom: 12px;
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag-badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    background: var(--color-tag-bg);
    color: var(--color-tag-text);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    transition: var(--transition);
}

.tag-badge:hover {
    background: var(--color-primary);
    color: white;
}

.category-badge {
    background: var(--color-primary);
    color: #fff;
}

.category-badge:hover {
    background: var(--color-primary-hover);
    color: #fff;
}

/* ===== Pagination ===== */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 48px;
}

.pagination a,
.pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: var(--color-text-soft);
    transition: var(--transition);
}

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

.pagination .current {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
    font-weight: 600;
}

.pagination .disabled {
    color: var(--color-text-muted);
    cursor: not-allowed;
    opacity: 0.5;
}

/* ===== Article Detail ===== */
.article-detail .article-header {
    margin-bottom: 36px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--color-border);
}

.article-detail .article-title {
    font-size: 2.25rem;
    line-height: 1.25;
    margin-bottom: 16px;
}

.article-detail .article-excerpt {
    font-size: 1.0625rem;
    color: var(--color-text-soft);
    margin-bottom: 0;
}

.article-cover {
    width: 100%;
    height: 320px;
    object-fit: cover;
    border-radius: var(--radius);
    margin-bottom: 36px;
}

.article-content {
    font-size: 1rem;
    line-height: 1.85;
    color: var(--color-text);
}

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4 {
    margin-top: 2em;
    margin-bottom: 0.75em;
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.01em;
}

.article-content h1 { font-size: 1.75rem; }
.article-content h2 {
    font-size: 1.5rem;
    padding-bottom: 0.3em;
    border-bottom: 1px solid var(--color-border);
}
.article-content h3 { font-size: 1.25rem; }
.article-content h4 { font-size: 1.0625rem; }

.article-content p {
    margin-bottom: 1.25em;
}

.article-content a {
    color: var(--color-primary);
    text-decoration: underline;
    text-decoration-color: var(--color-primary-soft);
    text-underline-offset: 3px;
}

.article-content a:hover {
    text-decoration-color: var(--color-primary);
}

.article-content ul,
.article-content ol {
    margin-bottom: 1.25em;
    padding-left: 1.5em;
}

.article-content li {
    margin-bottom: 0.5em;
}

.article-content blockquote {
    margin: 1.5em 0;
    padding: 12px 20px;
    border-left: 4px solid var(--color-primary);
    background: var(--color-bg-soft);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--color-text-soft);
}

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

.article-content code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--color-code-bg);
    color: var(--color-code-text);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
}

.article-content pre {
    margin: 1.5em 0;
    padding: 20px;
    background: #1e1e2e;
    border-radius: var(--radius);
    overflow-x: auto;
    line-height: 1.6;
}

.article-content pre code {
    background: transparent;
    color: #cdd6f4;
    padding: 0;
    font-size: 0.875rem;
}

.article-content table {
    width: 100%;
    margin: 1.5em 0;
    border-collapse: collapse;
    font-size: 0.9375rem;
}

.article-content th,
.article-content td {
    padding: 10px 16px;
    border: 1px solid var(--color-border);
    text-align: left;
}

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

.article-content img {
    border-radius: var(--radius);
    margin: 1.5em 0;
}

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

/* ===== Article Footer ===== */
.article-footer {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
}

.article-nav {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 32px;
}

.article-nav .nav-item {
    flex: 1;
    padding: 16px 20px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    transition: var(--transition);
}

.article-nav .nav-item:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.article-nav .nav-item .nav-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: 4px;
}

.article-nav .nav-item .nav-title {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text);
}

.article-nav .nav-item.next {
    text-align: right;
}

/* ===== Related Articles ===== */
.related-articles h3 {
    font-size: 1.125rem;
    margin-bottom: 16px;
}

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

.related-list li {
    padding: 10px 0;
    border-bottom: 1px solid var(--color-border);
}

.related-list li:last-child {
    border-bottom: none;
}

.related-list a {
    color: var(--color-text-soft);
    font-size: 0.9375rem;
}

.related-list a:hover {
    color: var(--color-primary);
}

/* ===== Tag Page ===== */
.tag-header {
    text-align: center;
    margin-bottom: 48px;
    padding: 32px;
    background: var(--color-bg-soft);
    border-radius: var(--radius);
}

.tag-header h1 {
    font-size: 1.75rem;
    margin-bottom: 8px;
}

.tag-header .tag-count {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
}

/* ===== About Page ===== */
.about-page {
    max-width: 720px;
    margin: 0 auto;
}

.about-page .page-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 32px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border);
}

/* ===== 404 Page ===== */
.not-found {
    text-align: center;
    padding: 80px 24px;
}

.not-found .error-code {
    font-size: 6rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: 16px;
    font-family: var(--font-mono);
}

.not-found .error-message {
    font-size: 1.25rem;
    color: var(--color-text-soft);
    margin-bottom: 32px;
}

/* ===== Password Protection ===== */
.password-page {
    display: flex;
    justify-content: center;
    padding: 60px 24px;
}

.password-card {
    max-width: 420px;
    width: 100%;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    padding: 40px 32px;
    text-align: center;
}

.password-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.password-desc {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    margin-bottom: 24px;
}

.password-input {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    color: var(--color-text);
    outline: none;
    margin-bottom: 12px;
    transition: var(--transition);
}

.password-input:focus {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.password-submit {
    width: 100%;
    padding: 12px;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.password-submit:hover {
    background: var(--color-primary-hover);
}

.password-error {
    color: #e0392f;
    font-size: 0.875rem;
    margin-top: 12px;
    min-height: 20px;
}

/* ===== Comments ===== */
.comment-section {
    margin-top: 64px;
    padding-top: 40px;
    border-top: 1px solid var(--color-border);
}

.comment-title {
    font-size: 1.375rem;
    font-weight: 700;
    margin-bottom: 24px;
}

.comment-list {
    margin-bottom: 32px;
}

.comment-empty {
    color: var(--color-text-muted);
    text-align: center;
    padding: 24px;
    font-size: 0.9375rem;
}

.comment-item {
    padding: 16px 0;
    border-bottom: 1px solid var(--color-border);
}

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

.comment-nickname {
    font-weight: 600;
    color: var(--color-text);
    font-size: 0.9375rem;
}

.comment-time {
    color: var(--color-text-muted);
    font-size: 0.8125rem;
}

.comment-item-body {
    color: var(--color-text-soft);
    font-size: 0.9375rem;
    line-height: 1.7;
    white-space: pre-wrap;
    word-break: break-word;
}

.comment-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.comment-form-row {
    display: flex;
    gap: 12px;
}

.comment-input {
    flex: 1;
    padding: 10px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    color: var(--color-text);
    background: var(--color-bg-card);
    outline: none;
    transition: var(--transition);
}

.comment-input:focus {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.comment-textarea {
    min-height: 100px;
    padding: 10px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    color: var(--color-text);
    background: var(--color-bg-card);
    outline: none;
    resize: vertical;
    font-family: var(--font-sans);
    transition: var(--transition);
}

.comment-textarea:focus {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.comment-captcha-row {
    align-items: center;
}

.captcha-question {
    flex: 1;
    font-family: var(--font-mono);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    background: var(--color-bg-soft);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    text-align: center;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.comment-captcha-input {
    flex: 0 0 120px;
}

.comment-captcha-refresh {
    flex: 0 0 auto;
    padding: 10px 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--color-primary);
    cursor: pointer;
    font-size: 0.875rem;
    transition: var(--transition);
}

.comment-captcha-refresh:hover {
    background: var(--color-primary-soft);
    border-color: var(--color-primary);
}

.comment-submit {
    align-self: flex-start;
    padding: 10px 28px;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.comment-submit:hover {
    background: var(--color-primary-hover);
}

/* ===== Footer ===== */
.site-footer {
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-soft);
    padding: 32px 24px;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.site-footer .footer-inner {
    max-width: var(--max-width-wide);
    margin: 0 auto;
}

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

.site-footer .footer-links {
    margin-bottom: 12px;
    display: flex;
    justify-content: center;
    gap: 20px;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .site-header .header-inner {
        padding: 0 16px;
        height: 56px;
    }

    .site-nav {
        gap: 16px;
    }

    .site-nav a {
        font-size: 0.875rem;
    }

    .site-main {
        padding: 32px 16px 64px;
    }

    .article-card {
        padding: 24px 0;
    }

    .article-title {
        font-size: 1.25rem;
    }

    .article-detail .article-title {
        font-size: 1.625rem;
    }

    .article-detail .article-excerpt {
        font-size: 0.9375rem;
    }

    .article-content {
        font-size: 0.9375rem;
    }

    .article-nav {
        flex-direction: column;
    }

    .article-nav .nav-item.next {
        text-align: left;
    }

    .pagination a,
    .pagination span {
        min-width: 32px;
        height: 32px;
        font-size: 0.8125rem;
    }
}