/* =========================================
   Variables
   ========================================= */
:root {
    color-scheme: light;
    --sidebar-width: 260px;
    --color-bg: #f5f5f4;
    --color-surface: #ffffff;
    --color-border: #e2e2e0;
    --color-text: #1a1a1a;
    --color-text-muted: #6b7280;
    --color-accent: #2563eb;
    --color-accent-hover: #3b82f6;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --radius: 6px;
    --transition: 0.2s ease;
}

/* =========================================
   Reset & Base
   ========================================= */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

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

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

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

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

/* =========================================
   Layout
   ========================================= */
.site-wrapper {
    display: flex;
    min-height: 100vh;
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 3rem 4rem;
    max-width: 100%;
    transition: margin-left var(--transition);
}

/* =========================================
   Sidebar
   ========================================= */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    height: 100dvh;
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    z-index: 100;
    overflow: hidden;
    transition: transform var(--transition);
}

.sidebar-header {
    padding: 2rem 1.5rem 1.5rem;
    border-bottom: 1px solid var(--color-border);
    text-align: center;
}

.site-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.site-name:hover {
    color: var(--color-accent);
}

.sidebar-nav {
    flex: 1;
    padding: 1.5rem 0;
}

.nav-menu {
    list-style: none;
}

.nav-menu li a {
    display: block;
    padding: 0.55rem 1.5rem;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    transition: color var(--transition), background var(--transition);
    border-left: 2px solid transparent;
}

.nav-menu li a:hover,
.nav-menu li.current-menu-item>a,
.nav-menu li.current_page_item>a {
    color: var(--color-text);
    background: rgb(37 99 235 / 0.08);
    border-left-color: var(--color-accent);
}

.nav-menu .sub-menu {
    list-style: none;
    padding-left: 1rem;
}

.sidebar-footer {
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--color-border);
    font-size: 0.75rem;
    color: var(--color-text-muted);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.sidebar-auth-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.82rem;
    color: var(--color-text-muted);
    transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.sidebar-auth-btn svg {
    width: 1rem;
    height: 1rem;
    flex-shrink: 0;
}

.sidebar-auth-btn:hover {
    color: var(--color-text);
    border-color: var(--color-accent);
    background: rgb(37 99 235 / 0.06);
}

.sidebar-auth-group {
    display: flex;
    gap: 0.5rem;
}

.sidebar-auth-group .sidebar-auth-btn {
    flex: 1;
    justify-content: center;
}

/* =========================================
   Sidebar Toggle (mobile)
   ========================================= */
.sidebar-toggle {
    display: none;
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 200;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 0.5rem;
    cursor: pointer;
    flex-direction: column;
    gap: 4px;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
}

.sidebar-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
}

.sidebar-toggle.active span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.sidebar-toggle.active span:nth-child(2) {
    opacity: 0;
}

.sidebar-toggle.active span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgb(0 0 0 / 0.6);
    z-index: 90;
    backdrop-filter: blur(2px);
}

/* =========================================
   Content
   ========================================= */
.content-area {
    width: 100%;
}

/* =========================================
   Entry / Post header
   ========================================= */
.entry-header,
.post-header {
    margin-bottom: 1.75rem;
    padding-bottom: 1.25rem;
    border-bottom: 1px solid var(--color-border);
}

/* =========================================
   Typography
   ========================================= */
.entry-title,
.post-title {
    font-size: 1.8rem;
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.03em;
    margin-bottom: 0.75rem;
    color: var(--color-text);
}

.entry-title a,
.post-title a {
    color: var(--color-text);
}

.entry-title a:hover,
.post-title a:hover {
    color: var(--color-accent);
}

.entry-content h1,
.entry-content h2,
.entry-content h3,
.entry-content h4,
.entry-content h5,
.entry-content h6 {
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.02em;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    color: var(--color-text);
}

.entry-content h1 {
    font-size: 1.7rem;
}

.entry-content h2 {
    font-size: 1.4rem;
}

.entry-content h3 {
    font-size: 1.15rem;
}

.entry-content p {
    margin-bottom: 1.25rem;
}

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

.entry-content li {
    margin-bottom: 0.25rem;
}

.entry-content code {
    font-family: var(--font-mono);
    font-size: 0.85em;
    background: var(--color-border);
    padding: 0.15em 0.4em;
    border-radius: 3px;
    color: var(--color-accent);
}

.entry-content pre {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.25rem;
    overflow-x: auto;
    margin-bottom: 1.25rem;
}

.entry-content pre code {
    background: none;
    padding: 0;
    font-size: 0.875rem;
    color: var(--color-text);
}

.entry-content blockquote {
    border-left: 3px solid var(--color-accent);
    padding: 0.5rem 1.25rem;
    margin: 1.5rem 0;
    color: var(--color-text-muted);
    font-style: italic;
}

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

/* =========================================
   Post meta
   ========================================= */
.post-meta {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* =========================================
   Post list
   ========================================= */
.posts-list {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.post-card {
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 2.5rem;
}

.post-excerpt {
    color: var(--color-text-muted);
    margin-bottom: 0.75rem;
}

.read-more {
    font-size: 0.85rem;
    color: var(--color-accent);
}

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

/* =========================================
   Navigation
   ========================================= */
.pagination,
.post-navigation {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
    font-size: 0.875rem;
}

.post-navigation .nav-links {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
}

.nav-previous a,
.nav-next a {
    color: var(--color-text-muted);
}

.nav-previous a:hover,
.nav-next a:hover {
    color: var(--color-accent);
}

/* =========================================
   Button
   ========================================= */
.btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    background: var(--color-accent);
    color: #fff;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    transition: background var(--transition);
}

.btn:hover {
    background: var(--color-accent-hover);
    color: #fff;
}

/* =========================================
   No content / 404
   ========================================= */
.no-content,
.error-404 .entry-content p {
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
}

/* =========================================
   Responsive
   ========================================= */
@media (width <= 768px) {
    .sidebar-toggle {
        display: flex;
    }

    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-overlay.open {
        display: block;
    }

    .main-content {
        margin-left: 0;
        padding: 5rem 1.5rem 2rem;
    }
}

@media (width <= 480px) {

    .entry-title,
    .post-title {
        font-size: 1.4rem;
    }

    .main-content {
        padding: 5rem 1.25rem 2rem;
    }
}