@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;500;600;700&display=swap');

:root {
  --ink-black: #2c2c2c;
  --paper-white: #faf8f3;
  --vermillion-red: #c23b22;
  --ink-gray: #666666;
  --light-gray: #e8e6e1;
  --gold-yellow: #c9a962;
  --jade-green: #4a7c59;
  --cerulean-blue: #3d6b8f;
  --rose-pink: #c97b7b;
  --lavender-purple: #8b7393;
  --cream-bg: #fdfbf7;
  --warm-border: #d4c4a8;
}

[data-theme="dark"] {
  --ink-black: #f5f3ef;
  --paper-white: #1a1a1a;
  --vermillion-red: #d44a3c;
  --ink-gray: #aaaaaa;
  --light-gray: #2d2d2d;
  --gold-yellow: #d4b86a;
  --jade-green: #5a8c69;
  --cerulean-blue: #4d7ba8;
  --rose-pink: #d98b8b;
  --lavender-purple: #9b83a3;
  --cream-bg: #252525;
  --warm-border: #4a3f2f;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Serif SC', serif;
  background-color: var(--paper-white);
  color: var(--ink-black);
  line-height: 1.8;
  min-height: 100vh;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  border-bottom: 1px solid var(--light-gray);
  padding: 1.5rem 0 3rem;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: var(--paper-white);
  z-index: 100;
  overflow: visible;
  min-height: 140px;
}

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

.logo {
  font-size: 1.8rem;
  font-weight: 600;
  color: var(--ink-black);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--ink-gray);
  text-decoration: none;
  font-size: 0.95rem;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 0.5rem;
  border-radius: 4px;
}

.nav-links a:nth-child(1):hover {
  color: var(--vermillion-red);
  background-color: rgba(194, 59, 34, 0.05);
}

.nav-links a:nth-child(2):hover {
  color: var(--cerulean-blue);
  background-color: rgba(61, 107, 143, 0.05);
}

.nav-links a:nth-child(3):hover {
  color: var(--lavender-purple);
  background-color: rgba(139, 115, 147, 0.05);
}

.search-toggle,
.theme-toggle {
  background: none;
  border: none;
  color: var(--ink-gray);
  cursor: pointer;
  padding: 0;
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color 0.3s ease;
}

.search-toggle:hover {
  color: var(--cerulean-blue);
}

.theme-toggle:hover {
  color: var(--lavender-purple);
}

.search-modal {
  display: none;
  position: fixed;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--paper-white);
  z-index: 99;
  padding: 1rem 0;
  border-bottom: 1px solid var(--light-gray);
}

.search-modal.active {
  display: block;
}

.search-content {
  display: flex;
  gap: 0.5rem;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
}

.search-input {
  flex: 1;
  padding: 0.75rem 1rem;
  min-width: 0;
  border: 1px solid var(--warm-border);
  border-radius: 6px;
  font-family: inherit;
  font-size: 1rem;
  background: linear-gradient(135deg, var(--paper-white) 0%, var(--cream-bg) 100%);
  background-color: var(--paper-white);
  color: var(--ink-black);
}

.search-input:focus {
  outline: none;
  border-color: var(--vermillion-red);
}

.search-close {
  background: none;
  border: 1px solid var(--light-gray);
  border-radius: 4px;
  color: var(--ink-gray);
  cursor: pointer;
  width: 42px;
  flex-shrink: 0;
  padding: 0.5rem;
  transition: all 0.3s ease;
}

.search-close:hover {
  border-color: var(--vermillion-red);
  color: var(--vermillion-red);
}

.search-results {
  margin-top: 1rem;
  max-height: 300px;
  overflow-y: auto;
}

.search-result-item {
  padding: 1rem;
  border-bottom: 1px solid var(--light-gray);
  transition: background-color 0.3s ease;
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item:hover {
  background-color: rgba(194, 59, 34, 0.05);
}

.search-result-title {
  display: block;
  font-weight: 600;
  color: var(--ink-black);
  text-decoration: none;
  margin-bottom: 0.5rem;
}

.search-result-title:hover {
  color: var(--vermillion-red);
}

.search-result-excerpt {
  color: var(--ink-gray);
  font-size: 0.9rem;
  line-height: 1.6;
}

.search-result-meta {
  color: var(--ink-gray);
  font-size: 0.8rem;
  margin-top: 0.5rem;
}

.no-results {
  text-align: center;
  padding: 2rem;
  color: var(--ink-gray);
}

.search-highlight {
  background: linear-gradient(135deg, rgba(194, 59, 34, 0.2) 0%, rgba(194, 59, 34, 0.1) 100%);
  color: var(--vermillion-red);
  padding: 0 2px;
  border-radius: 2px;
  font-weight: 600;
}

main {
  padding: 7rem 0 3rem;
}

.page-content {
  padding-top: 2rem;
  max-width: 720px;
  margin: 0 auto;
}

.article {
  background-color: var(--paper-white);
}

.hero {
  text-align: center;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.hero p {
  color: var(--ink-gray);
  font-size: 1.1rem;
}

.hitokoto {
  font-style: italic;
  min-height: 60px;
  opacity: 1;
  color: var(--ink-gray);
  padding: 1rem 0;
  border-left: 3px solid var(--gold-yellow);
  padding-left: 1.5rem;
  background: linear-gradient(90deg, rgba(201, 169, 98, 0.05) 0%, transparent 100%);
}

.hitokoto-author {
  display: block;
  font-size: 0.9rem;
  color: var(--jade-green);
  margin-top: 0.5rem;
  font-style: normal;
  text-align: right;
  font-weight: 500;
}

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

.post-item {
  padding: 2rem 0;
  border-bottom: 1px solid var(--warm-border);
  transition: all 0.3s ease;
}

.post-item:hover {
  background: linear-gradient(90deg, rgba(194, 59, 34, 0.02) 0%, transparent 100%);
}

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

.post-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--ink-black);
  text-decoration: none;
  display: block;
  margin-bottom: 0.8rem;
  transition: all 0.3s ease;
  position: relative;
  letter-spacing: 0.02em;
}

.post-title:hover {
  color: var(--vermillion-red);
}

.post-title::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--vermillion-red) 0%, var(--gold-yellow) 100%);
  transition: width 0.3s ease;
}

.post-title:hover::after {
  width: 80px;
}

.post-meta {
  display: flex;
  gap: 1.5rem;
  color: var(--ink-gray);
  font-size: 0.85rem;
  margin-bottom: 0.8rem;
}

.post-excerpt {
  color: var(--ink-gray);
  font-size: 0.9rem;
  line-height: 1.7;
  opacity: 0.85;
}

.post-content {
  font-size: 1.1rem;
  color: var(--ink-black);
  line-height: 1.9;
  word-spacing: 0.05em;
}

.post-content h1 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--light-gray);
  font-weight: 600;
}

.post-content h2 {
  font-size: 1.6rem;
  margin: 2.5rem 0 1.2rem;
  font-weight: 600;
}

.post-content h3 {
  font-size: 1.35rem;
  margin: 2rem 0 1rem;
  font-weight: 600;
}

.post-content h4 {
  font-size: 1.2rem;
  margin: 1.5rem 0 0.8rem;
  font-weight: 600;
}

.post-content p {
  margin-bottom: 1.5rem;
  text-indent: 2em;
  text-align: justify;
}

.post-content p:first-of-type {
  text-indent: 2em;
}

.post-content p:last-of-type {
  margin-bottom: 0;
}

.post-content a {
  color: var(--cerulean-blue);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: all 0.3s ease;
}

.post-content a:hover {
  color: var(--lavender-purple);
  border-bottom-color: var(--lavender-purple);
}

.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: 5px;
  margin: 1.5rem auto;
  display: block;
}

.post-content ul,
.post-content ol {
  margin-left: 2.5rem;
  margin-bottom: 1.5rem;
  margin-top: 1rem;
}

.post-content li {
  margin-bottom: 0.6rem;
  line-height: 1.8;
}

.post-content li > ul,
.post-content li > ol {
  margin-top: 0.6rem;
  margin-bottom: 0.6rem;
}

.post-content blockquote {
  border-left: 3px solid var(--lavender-purple);
  padding-left: 1.5rem;
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
  margin: 2rem 0;
  color: var(--ink-gray);
  font-style: italic;
  background: linear-gradient(90deg, rgba(139, 115, 147, 0.08) 0%, transparent 100%);
  border-radius: 0 5px 5px 0;
}

.post-content blockquote p {
  margin-bottom: 0;
  text-indent: 0;
}

.post-content code {
  background-color: var(--light-gray);
  padding: 0.25em 0.5em;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: 'Consolas', 'Monaco', monospace;
}

.post-content pre {
  background-color: var(--ink-black);
  color: var(--paper-white);
  padding: 1.25rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 1.5rem 0;
  line-height: 1.6;
}

.post-content pre code {
  background-color: transparent;
  color: inherit;
  padding: 0;
  font-size: 0.95rem;
}

.post-content hr {
  border: none;
  border-top: 1px solid var(--light-gray);
  margin: 2.5rem 0;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

.post-content th,
.post-content td {
  padding: 0.75rem;
  border: 1px solid var(--light-gray);
  text-align: left;
}

.post-content th {
  background-color: rgba(194, 59, 34, 0.05);
  font-weight: 600;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.tag {
  background-color: rgba(194, 59, 34, 0.08);
  color: var(--vermillion-red);
  padding: 0.3rem 0.8rem;
  border-radius: 3px;
  font-size: 0.85rem;
  text-decoration: none;
  transition: all 0.3s ease;
  border: 1px solid rgba(194, 59, 34, 0.2);
}

.tag:hover {
  background-color: var(--vermillion-red);
  color: var(--paper-white);
  border-color: var(--vermillion-red);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.tag-item {
  text-align: center;
  padding: 1.5rem;
  border: 1px solid var(--light-gray);
  border-radius: 5px;
  transition: all 0.3s ease;
}

.tag-item:hover {
  border-color: var(--vermillion-red);
}

.tag-item a {
  text-decoration: none;
  color: var(--ink-black);
}

.tag-count {
  display: block;
  color: var(--vermillion-red);
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.tag-name {
  font-size: 0.95rem;
}

.tag-page {
  padding: 2rem 0;
}

.tag-page h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--light-gray);
}

.tag-description {
  color: var(--ink-gray);
  margin-bottom: 2rem;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  padding: 2rem 0;
}

.tag-cloud-item {
  position: relative;
  color: var(--ink-gray);
  text-decoration: none;
  padding: 0.6rem 1.2rem;
  border: 1px solid var(--warm-border);
  border-radius: 2rem;
  transition: all 0.3s ease;
  background: linear-gradient(135deg, var(--cream-bg) 0%, var(--paper-white) 100%);
}

.tag-cloud-item:hover {
  border-color: var(--vermillion-red);
  color: var(--vermillion-red);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(194, 59, 34, 0.15);
  background: linear-gradient(135deg, rgba(194, 59, 34, 0.05) 0%, var(--paper-white) 100%);
}

.tag-cloud-count {
  display: inline-block;
  background-color: rgba(194, 59, 34, 0.1);
  color: var(--vermillion-red);
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  border-radius: 1rem;
  margin-left: 0.5rem;
  transition: all 0.3s ease;
  font-weight: 500;
}

.tag-cloud-item:hover .tag-cloud-count {
  background-color: var(--vermillion-red);
  color: var(--paper-white);
  transform: scale(1.05);
}

.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  margin-top: 4rem;
  padding: 2rem 0;
  border-top: 1px solid var(--light-gray);
}

.pagination a {
  color: var(--ink-gray);
  text-decoration: none;
  font-size: 1rem;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 50%;
  transition: all 0.3s ease;
  border: 1px solid transparent;
}

.pagination a:hover {
  color: var(--vermillion-red);
  border-color: var(--vermillion-red);
  background-color: rgba(194, 59, 34, 0.05);
}

.pagination .current {
  color: var(--paper-white);
  background: linear-gradient(135deg, var(--vermillion-red) 0%, #a83218 100%);
  font-weight: 600;
  border-radius: 50%;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 2px 8px rgba(194, 59, 34, 0.3);
}

.pagination .disabled {
  opacity: 0.3;
  pointer-events: none;
}

.pagination .ellipsis {
  color: var(--ink-gray);
  padding: 0 0.5rem;
}

footer {
  border-top: 1px solid var(--light-gray);
  padding: 2rem 0;
  text-align: center;
  color: var(--ink-gray);
  font-size: 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.footer-content {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.5rem 1rem;
}

.footer-content p {
  margin: 0;
  font-size: 1rem;
  position: relative;
  z-index: 1;
}

.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--vermillion-red) 0%, #a83218 100%);
  color: var(--paper-white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(194, 59, 34, 0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s ease;
  z-index: 90;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(194, 59, 34, 0.4);
}

.stamp {
  display: flex;
  width: 50px;
  height: 50px;
  border: 3px solid var(--vermillion-red);
  border-radius: 2px;
  padding: 0.1rem;
  font-size: 1rem;
  font-weight: 800;
  color: var(--vermillion-red);
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%) rotate(-6deg);
  align-items: center;
  justify-content: center;
  text-align: center;
  line-height: 1.1;
  letter-spacing: 0.05em;
  background: linear-gradient(145deg, 
    rgba(194, 59, 34, 0.08) 0%, 
    rgba(194, 59, 34, 0.03) 40%, 
    rgba(194, 59, 34, 0.07) 100%);
  box-shadow: 
    0 0 0 1.5px var(--paper-white),
    0 0 0 3px var(--vermillion-red),
    2px 2px 6px rgba(0, 0, 0, 0.2),
    inset 0 0 10px rgba(194, 59, 34, 0.12),
    inset 0 0 2px rgba(0, 0, 0, 0.08);
  opacity: 0.88;
  text-shadow: 
    0.3px 0.3px 0.8px rgba(0, 0, 0, 0.18),
    -0.3px -0.3px 0.4px rgba(255, 255, 255, 0.12);
  border-image: linear-gradient(45deg, 
    var(--vermillion-red) 0%, 
    rgba(194, 59, 34, 0.7) 50%, 
    var(--vermillion-red) 100%) 1;
  z-index: 2;
}

@media (max-width: 768px) {
  header {
    padding: 1rem 0;
  }
  
  main {
    padding: 12rem 0 2rem;
  }
  
  .hero h1 {
    font-size: 1.8rem;
  }
  
  .hero {
    padding: 1.5rem 0;
  }
  
  .nav-links {
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .nav-links a {
    font-size: 0.9rem;
  }
  
  .header-content {
    flex-direction: column;
    gap: 1rem;
  }
  
  .logo {
    font-size: 1.5rem;
  }
  
  .post-meta {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .post-title {
    font-size: 1.3rem;
  }
  
  .post-excerpt {
    font-size: 0.95rem;
  }
  
  .container {
    padding: 0 15px;
  }
  
  .footer-content p {
    font-size: 0.9rem;
  }
  
  .stamp {
    width: 45px;
    height: 45px;
    font-size: 0.85rem;
  }
  
  .pagination {
    gap: 0.3rem;
  }
  
  .pagination .page-number,
  .pagination .current {
    min-width: 32px;
    height: 32px;
    font-size: 0.9rem;
  }
  
  .pagination .ellipsis {
    padding: 0 0.3rem;
  }
  
  .search-modal {
    top: 100px;
  }
  
  .search-input {
    font-size: 1rem;
    padding: 0.8rem 1rem;
  }
  
  .search-result-title {
    font-size: 1.1rem;
  }
  
  .post-content {
    font-size: 1rem;
    line-height: 1.8;
  }
  
  .post-content h1 {
    font-size: 1.6rem;
  }
  
  .post-content h2 {
    font-size: 1.4rem;
  }
  
  .post-content h3 {
    font-size: 1.2rem;
  }
  
  .post-content p {
    margin-bottom: 1.2rem;
  }
  
  .post-content ul,
  .post-content ol {
    margin-left: 1.8rem;
  }
  
  .post-content blockquote {
    margin: 1.5rem 0;
    padding-left: 1.2rem;
  }
  
  .post-content pre {
    padding: 1rem;
    font-size: 0.9rem;
  }
}

@media (max-width: 480px) {
  header {
    padding: 0.8rem 0;
  }
  
  main {
    padding: 7rem 0 1.5rem;
  }
  
  .hero h1 {
    font-size: 1.5rem;
  }
  
  .logo {
    font-size: 1.3rem;
  }
  
  .nav-links {
    gap: 0.8rem;
  }
  
  .nav-links a {
    font-size: 0.85rem;
  }
  
  .search-toggle,
  .theme-toggle {
    padding: 0.4rem;
  }
  
  .post-title {
    font-size: 1.2rem;
  }
  
  .post-content {
    font-size: 0.95rem;
    line-height: 1.7;
  }
  
  .post-content h1 {
    font-size: 1.4rem;
  }
  
  .post-content h2 {
    font-size: 1.2rem;
  }
  
  .post-content h3 {
    font-size: 1.1rem;
  }
  
  .post-content p {
    margin-bottom: 1rem;
    text-indent: 1.5em;
  }
  
  .post-content ul,
  .post-content ol {
    margin-left: 1.5rem;
  }
  
  .post-content blockquote {
    margin: 1.2rem 0;
    padding-left: 1rem;
    padding-right: 0.5rem;
  }
  
  .post-content code {
    font-size: 0.85em;
  }
  
  .post-content pre {
    padding: 0.8rem;
    font-size: 0.85rem;
  }
  
  .footer-content {
    padding: 0.5rem 0.5rem;
  }
  
  .stamp {
    width: 40px;
    height: 40px;
    font-size: 0.8rem;
  }
}