/*
Theme Name: Blog
Theme URI: https://example.com/blog
Author: Developer
Author URI: https://example.com
Description: 블로그 특화 커스텀 워드프레스 테마
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.4
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: blog
Tags: blog, custom-background, custom-logo, custom-menu, featured-images, threaded-comments, translation-ready
*/

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

:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-secondary: #64748b;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-background: #ffffff;
    --color-background-alt: #f8fafc;
    --color-border: #e2e8f0;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-serif: Georgia, 'Times New Roman', serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', monospace;

    /* Layout - 광고 최적화 (728x90, 300x250, 300x600) */
    --layout-max: 1200px;
    --content-width: 820px;
    --sidebar-width: 340px;
    --layout-gap: 40px;
    --container-padding: 24px;
    --sidebar-padding: 20px;

    /* Legacy (하위 호환) */
    --container-max: var(--layout-max);
    --content-max: 728px;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* UI */
    --border-radius: 8px;
    --transition: 0.2s ease;
}

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

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-background);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
}

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

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

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

/* Layout */
.container {
    max-width: var(--layout-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.content-area {
    max-width: var(--content-max);
    margin: 0 auto;
}

.site-content {
    padding: var(--container-padding) 0;
}

/* Header */
.site-header {
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    padding: 13px 0;
    z-index: 100;
}

.header-inner {
    max-width: var(--layout-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
}

.header-center {
    display: flex;
    justify-content: center;
}

/* Header Left - Logo & Title */
.header-left {
    display: flex;
    align-items: center;
}

.site-branding {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.site-logo {
    flex-shrink: 0;
}

.site-logo img {
    max-height: 36px;
    width: auto;
}

.site-identity {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.site-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0;
    line-height: 1.2;
}

.site-title a {
    color: var(--color-text);
    transition: color 0.3s ease;
}

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

.site-description {
    color: var(--color-text-light);
    font-size: 0.7rem;
    margin: 0;
    line-height: 1.2;
}

/* Header Right - Navigation & DateTime */

.main-navigation ul {
    display: flex;
    gap: 2px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.main-navigation li {
    margin: 0;
}

.main-navigation a {
    display: inline-block;
    color: var(--color-text);
    font-weight: 500;
    font-size: 0.875rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 6px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.main-navigation a:hover {
    color: var(--color-primary);
    background-color: rgba(37, 99, 235, 0.08);
    transform: translateY(-1px);
}

.main-navigation .current-menu-item a {
    color: var(--color-primary);
    background-color: rgba(37, 99, 235, 0.1);
}

.header-right {
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.header-datetime {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-mono);
    font-size: 0.813rem;
    color: var(--color-text);
    padding: var(--spacing-sm);
}

.calendar-icon {
    color: var(--color-primary);
    flex-shrink: 0;
}

.header-date {
    color: var(--color-text);
    font-weight: 600;
    letter-spacing: 0.02em;
}

.header-date.saturday {
    color: #2563eb;
}

.header-date.sunday {
    color: #dc2626;
}

.header-time {
    color: var(--color-text-light);
    font-weight: 500;
    letter-spacing: 0.02em;
}

/* Posts */
.post {
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
    border-bottom: 1px solid var(--color-border);
}

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

.entry-header {
    margin-bottom: var(--spacing-lg);
}

.entry-title {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-sm);
}

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

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

.entry-meta {
    color: var(--color-text-light);
    font-size: 0.875rem;
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.entry-meta a {
    color: var(--color-text-light);
}

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

.entry-content {
    margin-bottom: var(--spacing-lg);
}

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

.entry-footer {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

.read-more {
    display: inline-block;
    font-weight: 500;
    margin-top: var(--spacing-md);
}

/* Featured Image */
.post-thumbnail {
    margin-bottom: var(--spacing-lg);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.post-thumbnail img {
    width: 100%;
    object-fit: cover;
}

/* Single Post */
.single .entry-title {
    font-size: 2.5rem;
}

.single .entry-content {
    font-size: 1.125rem;
}

/* Sidebar */
.widget-area {
    padding: var(--spacing-xl) 0;
}

.widget {
    margin-bottom: var(--spacing-xl);
}

.widget-title {
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-primary);
}

.widget ul {
    list-style: none;
}

.widget li {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

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

/* Footer */
.site-footer {
    background-color: var(--color-background-alt);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.site-footer p {
    color: var(--color-text-light);
    font-size: 0.875rem;
    margin: 0;
}

/* Comments */
.comments-area {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
}

.comments-title {
    margin-bottom: var(--spacing-xl);
}

.comment-list {
    list-style: none;
}

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

.comment-author {
    font-weight: 600;
}

.comment-meta {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
}

.comment-content {
    margin-top: var(--spacing-md);
}

.comment-reply-link {
    font-size: 0.875rem;
    font-weight: 500;
}

/* Comment Form */
.comment-form label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.comment-form input[type="text"],
.comment-form input[type="email"],
.comment-form input[type="url"],
.comment-form textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

.comment-form textarea {
    min-height: 150px;
    resize: vertical;
}

.comment-form input:focus,
.comment-form textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.comment-form .submit {
    background-color: var(--color-primary);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-xl);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color var(--transition);
}

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

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-2xl);
}

.pagination .page-numbers {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-text);
    font-weight: 500;
}

.pagination .page-numbers.current,
.pagination .page-numbers:hover {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

/* 404 Page */
.error-404 {
    text-align: center;
    padding: var(--spacing-2xl) 0;
}

.error-404 h1 {
    font-size: 6rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

/* Responsive */
@media (max-width: 992px) {
    .header-inner {
        grid-template-columns: 1fr;
        gap: var(--spacing-xs);
        text-align: center;
        padding: var(--spacing-xs) var(--spacing-md);
    }

    .header-left {
        justify-content: center;
    }

    .site-branding {
        justify-content: center;
    }

    .header-center {
        justify-content: center;
    }

    .header-right {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-2xl: 2rem;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }

    .main-navigation ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 2px;
    }

    .main-navigation a {
        font-size: 0.8rem;
        padding: 2px 6px;
    }

    .header-datetime {
        font-size: 0.75rem;
        padding: 8px;
    }

    .single .entry-title {
        font-size: 1.75rem;
    }
}

/* Accessibility */
.screen-reader-text {
    clip: rect(1px, 1px, 1px, 1px);
    position: absolute !important;
    height: 1px;
    width: 1px;
    overflow: hidden;
}

.screen-reader-text:focus {
    background-color: #f1f1f1;
    border-radius: 3px;
    box-shadow: 0 0 2px 2px rgba(0, 0, 0, 0.6);
    clip: auto !important;
    color: #21759b;
    display: block;
    font-size: 0.875rem;
    font-weight: 700;
    height: auto;
    left: 5px;
    line-height: normal;
    padding: 15px 23px 14px;
    text-decoration: none;
    top: 5px;
    width: auto;
    z-index: 100000;
}

/* WordPress Core Styles */
.alignleft {
    float: left;
    margin-right: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.alignright {
    float: right;
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.aligncenter {
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.wp-caption {
    max-width: 100%;
}

.wp-caption-text {
    font-size: 0.875rem;
    color: var(--color-text-light);
    text-align: center;
    margin-top: var(--spacing-sm);
}

/* Single Post Layout with Sidebar - 광고 최적화 */
.single-layout {
    display: grid;
    grid-template-columns: var(--content-width) var(--sidebar-width);
    gap: var(--layout-gap);
    max-width: var(--layout-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.single-layout .content-area {
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--container-padding);
    box-sizing: border-box;
    max-width: none;
}

.sidebar {
    width: var(--sidebar-width);
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--sidebar-padding);
    box-sizing: border-box;
    align-self: start;
}

.sidebar-inner {
    position: sticky;
    top: 20px;
}

/* Sidebar Search */
.sidebar-search {
    margin-bottom: var(--spacing-lg);
}

.search-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.search-input-wrap {
    display: flex;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: border-color var(--transition);
}

.search-input-wrap:focus-within {
    border-color: var(--color-primary);
}

.search-input {
    flex: 1;
    border: none;
    padding: 10px 12px;
    font-size: 0.875rem;
    outline: none;
}

.search-submit {
    background-color: var(--color-primary);
    border: none;
    padding: 10px 14px;
    color: white;
    cursor: pointer;
    transition: background-color var(--transition);
}

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

/* Sidebar TOC */
.sidebar-toc {
    margin-bottom: var(--spacing-lg);
    background-color: var(--color-background-alt);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
}

.toc-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
}

.toc-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.toc-list li {
    margin-bottom: var(--spacing-xs);
}

.toc-list a {
    display: block;
    font-size: 0.813rem;
    color: var(--color-text-light);
    padding: var(--spacing-xs) 0;
    transition: color var(--transition);
}

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

.toc-list .toc-h3 {
    padding-left: var(--spacing-md);
}

.toc-list .toc-h3 a {
    font-size: 0.75rem;
}

/* Ad Areas */
.ad-area {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #f1f5f9;
    border: 2px dashed #cbd5e1;
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
}

.ad-728x90 {
    width: 728px;
    height: 90px;
    max-width: 100%;
}

.ad-300x250 {
    width: 300px;
    height: 250px;
    flex-shrink: 0;
}

.ad-300x600 {
    width: 300px;
    height: 600px;
    flex-shrink: 0;
}

.ad-label {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: #94a3b8;
    font-weight: 500;
}

/* Responsive Single Layout */
@media (max-width: 1248px) {
    .single-layout {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        max-width: var(--content-width);
    }

    .sidebar {
        width: 100%;
        max-width: var(--sidebar-width);
        margin: 0 auto;
    }

    .ad-728x90 {
        width: 100%;
        max-width: 728px;
        margin: 0 auto;
    }

    .ad-300x250,
    .ad-300x600 {
        margin: 0 auto;
    }
}