/* ==========================================================================
   Smart Work Lab - Tech & AI Skin Style Sheet (Blog 1)
   Accent: Modern Indigo (#4f46e5) & Cyber Cyan (#06b6d4)
   ========================================================================== */

/* 1. CSS Variables System */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-sub: #06b6d4;
  --accent-gradient: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
  --border-color: #e2e8f0;
  --card-bg: #ffffff;
  --card-shadow: 0 4px 12px rgba(15, 23, 42, 0.05);
  --card-shadow-hover: 0 12px 24px -4px rgba(79, 70, 229, 0.12);
  --header-bg: rgba(255, 255, 255, 0.9);
  --header-blur: 14px;
  --code-bg: #f1f5f9;
  --code-text: #0284c7;
  --blockquote-bg: #f8fafc;
  --badge-bg: #eef2ff;
  --badge-text: #4f46e5;
  --font-sans: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', Consolas, Monaco, monospace;
}

[data-theme="dark"] {
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-sub: #38bdf8;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #38bdf8 100%);
  --border-color: #1e293b;
  --card-bg: #131d31;
  --card-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  --card-shadow-hover: 0 14px 28px -4px rgba(99, 102, 241, 0.25);
  --header-bg: rgba(11, 15, 25, 0.88);
  --code-bg: #1e293b;
  --code-text: #38bdf8;
  --blockquote-bg: #131d31;
  --badge-bg: rgba(99, 102, 241, 0.15);
  --badge-text: #818cf8;
}

/* 2. Global Resets */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background-color 0.25s ease, color 0.25s ease;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, transform 0.2s ease;
}

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

button, input, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
}

ul, ol {
  list-style: none;
}

.display-none {
  display: none !important;
}

/* 3. Layout */
#wrap {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

#container {
  flex: 1;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px;
}

.main {
  display: grid;
  grid-template-columns: 1fr 310px;
  gap: 40px;
}

.area-main {
  min-width: 0;
}

/* 4. Header */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--header-bg);
  backdrop-filter: blur(var(--header-blur));
  -webkit-backdrop-filter: blur(var(--header-blur));
  border-bottom: 1px solid var(--border-color);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 20px;
}

.header-logo-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.title-logo {
  font-size: 1.4rem;
  font-weight: 800;
}

.link-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 6px;
  background: var(--accent-gradient);
  color: #ffffff;
  letter-spacing: 0.05em;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.logo-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-theme-toggle {
  cursor: pointer;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

.btn-theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.icon-sun { display: none; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }

.button-menu {
  cursor: pointer;
  display: none;
  color: var(--text-primary);
}

.header-nav-row {
  margin-top: 14px;
  display: flex;
  align-items: center;
  border-top: 1px solid var(--border-color);
  padding-top: 12px;
}

.area-gnb nav ul {
  display: flex;
  gap: 24px;
}

.area-gnb nav ul li a {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.area-gnb nav ul li a:hover {
  color: var(--accent);
}

/* 5. Post Card List */
.title-search {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent);
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
  margin-bottom: 40px;
}

.article-type-common {
  background-color: var(--card-bg);
  border-radius: 14px;
  border: 1px solid var(--border-color);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.article-type-common:hover {
  transform: translateY(-5px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--accent);
}

.link-article-thumb {
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
}

.thumbnail-wrap {
  width: 100%;
  height: 100%;
  background: var(--bg-secondary);
}

.img-thumbnail {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.article-type-common:hover .img-thumbnail {
  transform: scale(1.04);
}

.article-content {
  padding: 22px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-badge {
  align-self: flex-start;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  background-color: var(--badge-bg);
  color: var(--badge-text);
  margin-bottom: 10px;
  font-family: var(--font-mono);
}

.article-content .title {
  display: block;
  font-size: 1.15rem;
  font-weight: 800;
  line-height: 1.45;
  color: var(--text-primary);
  margin-bottom: 10px;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.article-content .summary {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 18px;
  line-height: 1.6;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  flex: 1;
}

.box-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.78rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  padding-top: 12px;
}

.box-meta a.link-category {
  color: var(--accent);
  font-weight: 700;
}

.box-meta .reply {
  margin-left: auto;
}

/* 6. Article Detail View Header (Refined Premium Editorial) */
.article-header {
  border-radius: 20px;
  overflow: hidden;
  margin-bottom: 35px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
}

.article-header.has-bg {
  background-size: cover;
  background-position: center;
  position: relative;
  border: none;
}

.article-header-overlay {
  padding: 45px 36px;
}

.article-header.has-bg .article-header-overlay {
  background: linear-gradient(180deg, rgba(11, 15, 25, 0.45) 0%, rgba(11, 15, 25, 0.9) 100%);
  color: #ffffff;
}

.article-meta-wrap {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  width: 100%;
}

.article-category-badge {
  margin-bottom: 14px;
}

.article-category-badge a {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: 9999px;
  font-size: 0.82rem;
  font-weight: 800;
  text-decoration: none;
  background: rgba(37, 99, 235, 0.1);
  color: var(--accent);
  border: 1px solid rgba(37, 99, 235, 0.2);
  transition: all 0.2s ease;
}

.article-category-badge a:hover {
  background: var(--accent);
  color: #ffffff;
}

.article-header.has-bg .article-category-badge a {
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(4px);
}

.title-article {
  font-size: 2.15rem;
  font-weight: 800;
  line-height: 1.38;
  color: var(--text-primary);
  margin: 0 0 16px 0;
  word-break: keep-all;
  letter-spacing: -0.025em;
}

.article-header.has-bg .title-article {
  color: #ffffff;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

.article-info-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.86rem;
  color: var(--text-muted);
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
  width: 100%;
}

.article-header.has-bg .article-info-bar {
  color: rgba(255, 255, 255, 0.85);
  border-top-color: rgba(255, 255, 255, 0.2);
}

.article-info-bar .divider {
  color: var(--border-color);
  font-size: 0.8rem;
}

.article-header.has-bg .article-info-bar .divider {
  color: rgba(255, 255, 255, 0.4);
}

.article-info-bar span {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

/* Body Content Typography */
.entry-content {
  font-size: 1.08rem;
  color: var(--text-primary);
  line-height: 1.85;
}

.entry-content h1, .entry-content h2, .entry-content h3 {
  font-weight: 800;
  margin: 40px 0 18px 0;
  letter-spacing: -0.02em;
}

.entry-content h1 {
  font-size: 1.7rem;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border-color);
}

.entry-content h2 {
  font-size: 1.45rem;
  border-left: 5px solid var(--accent);
  padding-left: 14px;
}

.entry-content h3 {
  font-size: 1.25rem;
  color: var(--accent);
}

.entry-content p {
  margin-bottom: 24px;
}

.entry-content ul, .entry-content ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

.entry-content li {
  margin-bottom: 8px;
}

.entry-content blockquote {
  background-color: var(--blockquote-bg);
  border-left: 4px solid var(--accent);
  padding: 18px 24px;
  margin: 30px 0;
  border-radius: 0 10px 10px 0;
  color: var(--text-secondary);
}

.entry-content code {
  font-family: var(--font-mono);
  background-color: var(--code-bg);
  color: var(--code-text);
  padding: 3px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

.entry-content pre {
  background-color: var(--code-bg);
  padding: 20px;
  border-radius: 10px;
  margin: 24px 0;
  overflow-x: auto;
  border: 1px solid var(--border-color);
}

.entry-content pre code {
  background: none;
  color: inherit;
  padding: 0;
}

.entry-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 30px 0;
  font-size: 0.95rem;
}

.entry-content th, .entry-content td {
  padding: 12px 16px;
  border: 1px solid var(--border-color);
}

.entry-content th {
  background-color: var(--bg-secondary);
  font-weight: 700;
}

/* 7. Footer Elements & Tags */
.article-footer {
  border-top: 1px solid var(--border-color);
  padding-top: 35px;
  margin-top: 50px;
}

.title-footer {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.box-tag {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 35px;
}

.box-tag a {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
}

.box-tag a:hover {
  background: var(--accent-gradient);
  color: #ffffff !important;
  border-color: transparent;
}

.nav-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 40px;
}

.nav-links li {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px 20px;
  transition: all 0.2s ease;
}

.nav-links li:hover {
  border-color: var(--accent);
}

.nav-dir {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
}

.nav-links strong {
  display: block;
  font-size: 0.95rem;
  font-weight: 700;
  margin-top: 4px;
}

/* 8. Paging */
.area-paging {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  margin: 40px 0;
}

.link_page, .link_num {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
  background-color: var(--card-bg);
  font-weight: 600;
}

.link_num:hover, .link_num.selected {
  background: var(--accent-gradient);
  color: #ffffff !important;
  border-color: transparent;
}

/* 9. Sidebar */
.aside-inner {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.title-sidebar {
  font-size: 0.95rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 8px;
}

.box-profile {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: var(--card-shadow);
  padding: 28px 20px;
  text-align: center;
}

.img-profile {
  width: 84px;
  height: 84px;
  border-radius: 50%;
  margin: 0 auto 14px auto;
  border: 3px solid var(--accent);
}

.tit-g {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.text-profile {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 18px;
}

/* Reader-friendly CTA buttons (replaces admin buttons) */
.sidebar-reader-cta {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidebar-reader-cta .reader-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 0.84rem;
  font-weight: 700;
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  transition: all 0.2s ease;
  cursor: pointer;
  text-decoration: none;
}

.sidebar-reader-cta .reader-btn:hover {
  background: var(--accent-gradient);
  color: #ffffff;
  border-color: transparent;
  transform: translateY(-1px);
  box-shadow: var(--card-shadow-hover);
}

.sidebar-reader-cta .reader-btn i {
  font-size: 0.95rem;
}

.category-nav li {
  margin-bottom: 6px;
}

.category-nav a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding: 8px 12px;
  border-radius: 8px;
  font-weight: 500;
}

.category-nav a:hover {
  background-color: var(--bg-secondary);
  color: var(--accent);
}

.box-recent-tab {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  overflow: hidden;
}

.tab-recent-nav {
  display: flex;
  border-bottom: 1px solid var(--border-color);
}

.tab-recent-nav li {
  flex: 1;
  text-align: center;
  padding: 12px;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
}

.tab-recent-nav li.active {
  background-color: var(--card-bg);
  color: var(--accent);
  border-bottom: 2px solid var(--accent);
}

.tab-content {
  display: none;
  padding: 16px;
}

.tab-content.active {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.link-recent {
  display: flex;
  gap: 12px;
  align-items: center;
}

.link-recent .thumbnail {
  width: 52px;
  height: 52px;
  border-radius: 8px;
  background-size: cover;
  background-position: center;
  background-color: var(--bg-secondary);
  flex-shrink: 0;
}

.box-recent-content strong {
  display: block;
  font-size: 0.84rem;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 3px;
}

.box-recent-content .date {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.box-tag-sidebar .box_tag {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.box-tag-sidebar .box_tag a {
  background-color: var(--bg-secondary);
  padding: 5px 10px;
  border-radius: 6px;
  font-size: 0.75rem;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.box-tag-sidebar .box_tag a:hover {
  background-color: var(--accent);
  color: #ffffff !important;
}

/* 10. Footer */
#footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 35px 20px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-align: center;
}

.footer-info address {
  font-style: normal;
  margin-top: 4px;
  color: var(--text-muted);
}

/* 11. Responsive */
@media screen and (max-width: 1024px) {
  .main {
    grid-template-columns: 1fr;
  }
  .wrap-drawer .area-aside {
    position: fixed;
    top: 0;
    right: -310px;
    width: 310px;
    height: 100%;
    background-color: var(--bg-primary);
    border-left: 1px solid var(--border-color);
    box-shadow: -4px 0 16px rgba(0,0,0,0.2);
    z-index: 2000;
    overflow-y: auto;
    padding: 30px 20px;
    transition: right 0.3s ease;
  }
  .wrap-drawer.aside-open .area-aside {
    right: 0;
  }
  .button-menu {
    display: block;
  }
  .wrap-drawer::before {
    content: '';
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.45);
    z-index: 1500;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
  }
  .wrap-drawer.aside-open::before {
    opacity: 1;
    pointer-events: auto;
  }
}

@media screen and (max-width: 768px) {
  #container { padding: 20px 15px; }
  .title-article { font-size: 1.65rem; }
  .article-list { grid-template-columns: 1fr; gap: 20px; }
  .article-header-overlay { padding: 30px 20px; }
  .nav-links { grid-template-columns: 1fr; }
}