/* ============================================
   Flexoki Color System
   https://stephango.com/flexoki
   ============================================ */

:root {
    /* --- Flexoki Base (Light Mode) --- */
    --black: #100F0F;
    --base-950: #1C1B1A;
    --base-900: #282726;
    --base-850: #343331;
    --base-800: #403E3C;
    --base-700: #575653;
    --base-600: #6F6E69;
    --base-500: #878580;
    --base-300: #B7B5AC;
    --base-200: #CECDC3;
    --base-150: #DAD8CE;
    --base-100: #E6E4D9;
    --base-50: #F2F0E5;
    --paper: #FFFCF0;

    /* --- Flexoki Accent Colors (Light: 600, Dark: 400) --- */
    --red-600: #AF3029;
    --orange-600: #BC5215;
    --yellow-600: #AD8301;
    --green-600: #66800B;
    --cyan-600: #24837B;
    --blue-600: #205EA6;
    --purple-600: #5E409D;
    --magenta-600: #A02F6F;

    --red-400: #D14D41;
    --orange-400: #DA702C;
    --yellow-400: #D0A215;
    --green-400: #879A39;
    --cyan-400: #3AA99F;
    --blue-400: #4385BE;
    --purple-400: #8B7EC8;
    --magenta-400: #CE5D97;

    /* --- Semantic Tokens (Light Mode) --- */
    --color-bg: var(--paper);
    --color-bg-secondary: var(--base-50);
    --color-ui: var(--base-100);
    --color-ui-hover: var(--base-150);
    --color-ui-active: var(--base-200);
    --color-text: var(--black);
    --color-text-secondary: var(--base-600);
    --color-text-muted: var(--base-500);
    --color-link: var(--blue-600);
    --color-link-hover: var(--blue-600);
    --color-border: var(--base-200);
    --color-code-bg: var(--base-50);
    --color-accent: var(--blue-600);

    /* --- Layout --- */
    --max-width: 640px;
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2.5rem;
    --space-2xl: 4rem;

    /* --- Typography --- */
    --font-body: "LXGW WenKai", "Noto Serif SC", Georgia, "Times New Roman", serif;
    --font-mono: "LXGW WenKai Mono", "JetBrains Mono", "Fira Code", "Cascadia Code", monospace;
    --font-size-base: 1.05rem;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 1.8rem;
    --line-height: 1.8;
}



/* ============================================
   Reset & Base
   ============================================ */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    color: var(--color-text);
    background-color: var(--color-bg);
}

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

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

img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
}

/* ============================================
   Layout
   ============================================ */

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.site-main {
    flex: 1;
}

/* ============================================
   Header & Navigation
   ============================================ */

/* --- Shared nav bar --- */
.site-header {
    margin-bottom: var(--space-md);
}

.site-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.site-nav-left,
.site-nav-right {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.site-nav a {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    text-decoration: none;
    padding: var(--space-xs) 0;
    position: relative;
}

.site-nav a:hover,
.site-nav a.active {
    color: var(--color-text);
    text-decoration: none;
}

.site-nav a::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1.5px;
    background-color: var(--color-text);
    transition: width 0.2s ease;
}

.site-nav a:hover::after,
.site-nav a.active::after {
    width: 100%;
}

.site-nav-sep {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    user-select: none;
}

.site-nav-current {
    color: var(--color-text);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

/* --- Homepage hero --- */
.site-header--home .site-hero {
    margin-top: var(--space-2xl);
    margin-bottom: var(--space-lg);
}

.site-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--space-xs);
    letter-spacing: -0.01em;
    color: var(--color-text);
}

.site-subtitle {
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    margin: 0;
}

/* --- Inner page compact header --- */
.site-header--inner {
    margin-bottom: var(--space-xl);
}

.site-back-link {
    color: var(--color-text) !important;
    font-weight: 600;
}

.site-back-link::after {
    display: none !important;
}



/* ============================================
   Homepage
   ============================================ */

.home-intro {
    margin-bottom: var(--space-lg);
}

.home-intro p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
}

/* Post Cards */
.post-card {
    padding: var(--space-xl) 0;
    border-bottom: 1px solid var(--color-border);
}

.post-card:first-child {
    padding-top: var(--space-lg);
}

.post-card:last-child {
    border-bottom: none;
}

.post-card time {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.post-card-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin: var(--space-xs) 0 var(--space-sm);
    line-height: 1.4;
}

.post-card-title a {
    color: var(--color-text);
    text-decoration: none;
}

.post-card-title a:hover {
    color: var(--color-link);
    text-decoration: none;
}

.post-card-summary {
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    margin-bottom: var(--space-sm);
}

/* Single image layout: text left, image right */
.post-card-body {
    display: flex;
    gap: var(--space-lg);
    align-items: flex-start;
    margin-bottom: var(--space-sm);
}

.post-card-body .post-card-summary {
    flex: 1;
    margin-bottom: 0;
}

.post-card-images--single {
    flex-shrink: 0;
    width: 160px;
    height: 120px;
    overflow: hidden;
    border-radius: 4px;
}

.post-card-images--single img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Multiple images: grid layout */
.post-card-images--grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
    border-radius: 4px;
    overflow: hidden;
}

.post-card-images--grid img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: 4px;
}

.post-card-images--grid .post-card-image-link {
    display: block;
    overflow: hidden;
    border-radius: 4px;
}

/* Two images: side by side */
.post-card-images--duo {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
    border-radius: 4px;
    overflow: hidden;
}

.post-card-images--duo img {
    width: 100%;
    aspect-ratio: 4/3;
    object-fit: cover;
    border-radius: 4px;
}

.post-card-images--duo .post-card-image-link {
    display: block;
    overflow: hidden;
    border-radius: 4px;
}

.post-card-footer {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.read-more {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-decoration: none;
}

.read-more:hover {
    color: var(--color-text);
    text-decoration: none;
}

.post-card-meta {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* Pagination - yayu.net style */
.pagination {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-top: var(--space-xl);
    padding-top: var(--space-xl);
    font-size: var(--font-size-sm);
}

.pagination-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2rem;
    height: 2rem;
    padding: 0 var(--space-sm);
    border-radius: 4px;
    color: var(--color-text);
    text-decoration: none;
    transition: background-color 0.2s ease;
}

a.pagination-num:hover {
    background-color: var(--color-ui-hover);
    text-decoration: none;
}

.pagination-num.active {
    background-color: var(--color-text);
    color: var(--color-bg);
    font-weight: 600;
}

.pagination-ellipsis {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2rem;
    height: 2rem;
    color: var(--color-text-muted);
}

.pagination-arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2rem;
    height: 2rem;
    color: var(--color-text);
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.2s ease;
}

.pagination-arrow:hover {
    background-color: var(--color-ui-hover);
    text-decoration: none;
}

/* ============================================
   Post List
   ============================================ */

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

.post-list li {
    display: flex;
    align-items: baseline;
    gap: var(--space-md);
    padding: var(--space-sm) 0;
}

.post-list time {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}

.post-list a {
    color: var(--color-text);
    font-weight: 400;
}

.post-list a:hover {
    color: var(--color-link);
    text-decoration: none;
}

/* ============================================
   Single Post
   ============================================ */

.post-header {
    margin-bottom: var(--space-xl);
}

.post-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--space-sm);
    letter-spacing: -0.01em;
}

.post-meta {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.post-tags a {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

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

/* Post Content */
.post-content {
    line-height: var(--line-height);
}

.post-content h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-top: var(--space-2xl);
    margin-bottom: var(--space-md);
}

.post-content h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-top: var(--space-xl);
    margin-bottom: var(--space-sm);
}

.post-content p {
    margin-bottom: var(--space-lg);
}

.post-content ul,
.post-content ol {
    margin-bottom: var(--space-lg);
    padding-left: var(--space-lg);
}

.post-content li {
    margin-bottom: var(--space-xs);
}

.post-content blockquote {
    border-left: 3px solid var(--color-border);
    padding-left: var(--space-md);
    margin: var(--space-lg) 0;
    color: var(--color-text-secondary);
    font-style: italic;
}

.post-content code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background-color: var(--color-code-bg);
    padding: 0.15em 0.4em;
    border-radius: 3px;
}

.post-content pre {
    background-color: var(--color-code-bg);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: var(--space-md);
    overflow-x: auto;
    margin-bottom: var(--space-lg);
}

.post-content pre code {
    background: none;
    padding: 0;
    font-size: var(--font-size-sm);
}

.post-content hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: var(--space-xl) 0;
}

.post-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--space-lg);
    font-size: var(--font-size-sm);
}

.post-content th,
.post-content td {
    border: 1px solid var(--color-border);
    padding: var(--space-sm) var(--space-md);
    text-align: left;
}

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

.post-content img {
    margin: var(--space-lg) 0;
}

/* Post Navigation */
.post-nav {
    display: flex;
    justify-content: space-between;
    gap: var(--space-md);
    margin-top: var(--space-2xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
    font-size: var(--font-size-sm);
}

.post-nav .prev,
.post-nav .next {
    color: var(--color-text-secondary);
}

.post-nav .next {
    margin-left: auto;
}

/* ============================================
   List/Section Page
   ============================================ */

.list-page h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--space-xl);
}

/* ============================================
   Error Page
   ============================================ */

.error-page {
    text-align: center;
    padding: var(--space-2xl) 0;
}

.error-page h1 {
    font-size: 4rem;
    font-weight: 700;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

/* ============================================
   Footer
   ============================================ */

.site-footer {
    margin-top: var(--space-2xl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

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

.site-footer a:hover {
    color: var(--color-text);
    text-decoration: none;
}

/* Bottom navigation */
.site-bottom-nav {
    margin-bottom: var(--space-xl);
}

.site-bottom-nav-title {
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-md);
}

.site-bottom-nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.site-bottom-nav-links a {
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    text-decoration: none;
    transition: color 0.2s ease;
}

.site-bottom-nav-links a:hover {
    color: var(--color-text);
}

/* Back to top */
.site-footer-meta {
    margin-bottom: var(--space-xl);
}

.back-to-top {
    color: var(--color-text) !important;
    text-decoration: none;
}

.back-to-top:hover {
    text-decoration: none;
}

/* Copyright */
.site-footer-copyright {
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
}

/* Nav anchor link */
.site-nav-anchor {
    color: var(--color-text-secondary);
}

.site-nav-anchor::after {
    display: none !important;
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 600px) {
    :root {
        --font-size-2xl: 1.5rem;
        --font-size-xl: 1.25rem;
    }

    .container {
        padding: var(--space-lg) var(--space-md);
    }

    .post-list li {
        flex-direction: column;
        gap: 0;
    }

    .post-list time {
        font-size: 0.8rem;
    }

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