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

:root {
  --color-bg: #F2EDE5;
  --color-card-bg: rgba(255, 252, 248, 0.5);
  --color-text: #1c1c1c;
  --color-heading: #2c4450;
  --color-text-muted: #6b6b6b;
  --color-date: #838383;
  --color-border: #e0ddd8;
  --color-accent: #7F52FF;
  --color-code-bg: #1e1e1e;
  --color-code-text: #d4d4d4;
  --color-inline-code-bg: #f0eeeb;
  --color-link: #7F52FF;
  --color-toggle-bg: rgba(0, 0, 0, 0.06);
  --color-toggle-bg-hover: rgba(0, 0, 0, 0.12);
  --font-heading: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic Medium", "Yu Gothic", "Meiryo", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic Medium", "Yu Gothic", "Meiryo", sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "SF Mono", Menlo, Consolas, monospace;
  --content-width: 760px;
  --duration-hover: 0.2s;
  --duration-card-lift: 0.3s;
  --duration-theme: 0.5s;
  --transition-theme: var(--duration-theme) ease;
}

/* Dark Mode - System Preference */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #222831;
    --color-card-bg: rgba(45, 52, 64, 0.85);
    --color-text: #ececec;
    --color-heading: #f5f5f5;
    --color-header: #c8d3dc;
    --color-text-muted: #9a9a9a;
    --color-border: #393e46;
    --color-accent: #9b7aff;
    --color-code-bg: #1a1d24;
    --color-tag: #DCE775;
    --color-code-text: #d4d4d4;
    --color-inline-code-bg: #393e46;
    --color-link: #9b7aff;
    --color-toggle-bg: rgba(255, 255, 255, 0.08);
    --color-toggle-bg-hover: rgba(255, 255, 255, 0.15);
  }
}

/* Dark Mode - Manual Toggle */
[data-theme="dark"] {
  --color-bg: #222831;
  --color-card-bg: rgba(45, 52, 64, 0.85);
  --color-text: #ececec;
  --color-heading: #f5f5f5;
  --color-header: #c8d3dc;
  --color-text-muted: #9a9a9a;
  --color-border: #393e46;
  --color-accent: #9b7aff;
  --color-code-bg: #1a1d24;
  --color-tag: #DCE775;
  --color-code-text: #d4d4d4;
  --color-inline-code-bg: #393e46;
  --color-link: #9b7aff;
  --color-toggle-bg: rgba(255, 255, 255, 0.08);
  --color-toggle-bg-hover: rgba(255, 255, 255, 0.15);
}

/* Light Mode - Manual Toggle (override system preference) */
[data-theme="light"] {
  --color-bg: #F2EDE5;
  --color-card-bg: rgba(255, 252, 248, 0.5);
  --color-text: #1c1c1c;
  --color-heading: #3a3a3a;
  --color-header: #2c4450;
  --color-text-muted: #6b6b6b;
  --color-border: #e0ddd8;
  --color-accent: #7F52FF;
  --color-code-bg: #1e1e1e;
  --color-code-text: #d4d4d4;
  --color-tag: #827717;
  --color-inline-code-bg: #f0eeeb;
  --color-link: #7F52FF;
  --color-toggle-bg: rgba(0, 0, 0, 0.06);
  --color-toggle-bg-hover: rgba(0, 0, 0, 0.12);
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

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

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.9;
  letter-spacing: 0.03em;
  transition: background-color var(--transition-theme), color var(--transition-theme);
  font-feature-settings: "palt";
}

.article-card-wrapper,
.article-card,
.index-header,
article,
article pre,
article code,
article blockquote,
footer,
.pagination a {
  transition: background-color var(--transition-theme), color var(--transition-theme), border-color var(--transition-theme);
}

.container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.index-header>a {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1rem;
  font-weight: normal;
  line-height: 1.3;
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--duration-hover) ease;
}

.index-header>a:hover {
  color: var(--color-text-muted);
}

.article-card-wrapper {
  background: var(--color-card-bg);
  border-radius: 16px;
  padding: 0 2.5rem 3rem;
  margin-top: 3rem;
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.06);
}

.article-header {
  padding: 3rem 0 2.5rem;
  border-bottom: 1px solid var(--color-border);
}

.article-header h1 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--color-heading);
  margin-bottom: 1rem;
}

.article-header time {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
}

main {
  padding: 1rem 0 5rem;
}

article h2 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.5;
  margin: 3rem 0 1rem;
  color: var(--color-heading);
  letter-spacing: 0.01em;
}

article h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0.01em;
  margin: 2.4rem 0 0.8rem;
  color: var(--color-heading);
}

article p {
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}

article a {
  color: var(--color-link);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: opacity var(--duration-hover) ease;
  word-break: break-all;
}

article a:hover {
  opacity: 0.7;
}

article strong {
  font-weight: 500;
}

article blockquote {
  border-left: 2px solid var(--color-accent);
  padding-left: 1.5rem;
  margin: 2rem 0;
  color: var(--color-text-muted);
  font-style: italic;
}

article ul,
article ol {
  margin: 1.2rem 0 1.5rem;
  padding-left: 1.4rem;
  font-size: 0.95rem;
  line-height: 1.8;
}

article li {
  margin-bottom: 0.2rem;
}

article li ul,
article li ol {
  margin: 0.3rem 0 0.2rem;
}

article li::marker {
  color: var(--color-text-muted);
}

article code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--color-inline-code-bg);
  padding: 0.2em 0.45em;
  border-radius: 4px;
  font-weight: 400;
  font-feature-settings: normal;
}

article pre {
  background: var(--color-code-bg);
  border-radius: 8px;
  padding: 1.5rem 1.8rem;
  margin: 2rem 0;
  overflow-x: auto;
  line-height: 1.7;
  position: relative;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

article pre code {
  display: block;
  background: none;
  padding: 0;
  padding-top: 0;
  font-size: 0.82rem;
  color: var(--color-code-text);
  line-height: 1.7;
  font-feature-settings: normal;
}

article hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 3rem 0;
}

article img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  margin: 2rem auto;
  display: block;
}

footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem 0;
  text-align: center;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

.footer-credit {
  display: block;
  margin-top: 0.5rem;
}

.footer-credit a {
  color: var(--color-accent);
  text-decoration: none;
  transition: opacity var(--duration-hover) ease;
}

.footer-credit a:hover {
  opacity: 0.7;
}

.index-header {
  padding: 1.5rem 0 0.5rem;
  text-align: left;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header-actions .social-icon {
  width: 32px;
  height: 32px;
  border: none;
}

.index-header h1 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: 0.02em;
  color: var(--color-text);
  margin-bottom: 0;
}

.profile-section {
  padding: 4rem 0 0;
  text-align: center;
}

.profile-section h1 {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--color-heading);
  margin-bottom: 0.6rem;
}

.header-role,
.header-org {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.header-social {
  display: flex;
  justify-content: center;
  gap: 0.8rem;
  margin-top: 0;
}

.social-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: border-color var(--duration-hover) ease, color var(--duration-hover) ease;
}

.social-icon:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}


.theme-toggle {
  background: var(--color-toggle-bg);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  width: 32px;
  height: 32px;
  padding: 0;
  color: var(--color-text-muted);
  transition: background-color var(--duration-hover) ease, color var(--duration-hover) ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  background: var(--color-toggle-bg-hover);
  color: var(--color-accent);
}

button.social-icon {
  background: transparent;
  cursor: pointer;
}

.site-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--color-heading);
  text-decoration: none;
  transition: color var(--duration-hover) ease;
}

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

.icon-sun,
.icon-moon {
  display: none;
}

.icon-sun {
  display: block;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun {
    display: none;
  }

  :root:not([data-theme="light"]) .icon-moon {
    display: block;
  }
}

[data-theme="light"] .icon-sun {
  display: block;
}

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

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

[data-theme="dark"] .icon-moon {
  display: block;
}

.article-list {
  padding: 2rem 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.article-card {
  display: block;
  padding: 1.5rem 1.8rem;
  background: var(--color-card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 12px;
  text-decoration: none;
  color: var(--color-text);
  box-shadow:
    0 4px 24px rgba(0, 0, 0, 0.06),
    inset 0 1px 0 rgba(255, 255, 255, 0.5);
  transition:
    transform var(--duration-card-lift) cubic-bezier(0.4, 0, 0.2, 1),
    box-shadow var(--duration-card-lift) cubic-bezier(0.4, 0, 0.2, 1),
    border-color var(--duration-card-lift) ease;
}

.article-card:hover {
  transform: translateY(-6px);
  box-shadow:
    0 16px 40px rgba(0, 0, 0, 0.12),
    0 4px 12px rgba(0, 0, 0, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.6);
  border-color: rgba(255, 255, 255, 0.6);
}

.article-card h2 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 500;
  line-height: 1.4;
  margin-bottom: 0.4rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  min-height: calc(1.1rem * 1.4 * 2);
}

.article-card time {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-date);
  letter-spacing: 0.05em;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.8rem;
}

.tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  font-family: var(--font-body);
  font-size: 0.75rem;
  color: var(--color-tag);
  /* background: rgba(127, 82, 255, 0.08); */
  border: 1px solid color-mix(in srgb, var(--color-date) 20%, transparent);
  border-radius: 9999px;
  letter-spacing: 0.02em;
}

a.tag {
  text-decoration: none;
  transition: border-color var(--duration-hover) ease, color var(--duration-hover) ease;
}

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

.tag-heading {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-heading);
  letter-spacing: 0.02em;
  padding: 1.5rem 0 0;
}

.article-card .tags {
  margin-top: 0.6rem;
}

.article-card .tag {
  font-size: 0.7rem;
  padding: 0.2rem 0.6rem;
}

.article-card .summary {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-top: 0.7rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  padding: 2rem 0;
  margin-top: 1rem;
}

.pagination a,
.pagination span {
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  text-decoration: none;
  transition: all var(--duration-hover) ease;
}

.pagination a {
  background: var(--color-card-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.pagination a:hover {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.pagination .disabled {
  color: var(--color-text-muted);
  opacity: 0.4;
  cursor: not-allowed;
}

.pagination-info {
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

article table {
  width: 100%;
  table-layout: fixed;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.9rem;
}

article th,
article td {
  width: 50%;
  padding: 0.8rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

article th {
  font-weight: 500;
  background: rgba(127, 82, 255, 0.04);
}

article tr:hover td {
  background: rgba(127, 82, 255, 0.02);
}

article h1::after,
article h2::after {
  content: "";
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-accent);
  margin-top: 0.8rem;
  border-radius: 4px;
}

article h4 {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
  margin: 2rem 0 0.6rem;
  color: var(--color-heading);
}

article figure {
  margin: 2.5rem auto;
  text-align: center;
}

article figure img {
  margin: 0 auto;
}

article figcaption {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  text-align: center;
  margin-top: 0.8rem;
  font-style: italic;
}

article .twitter-tweet {
  margin: 0 auto !important;
}

article blockquote {
  border-left: 3px solid var(--color-accent);
  padding: 0.8rem 0 0.8rem 1.5rem;
  margin: 2rem 0;
  color: var(--color-text-muted);
  font-style: italic;
  background: rgba(127, 82, 255, 0.02);
  border-radius: 0 6px 6px 0;
}

article blockquote p {
  margin-bottom: 0;
}

article ul li {
  position: relative;
  padding-left: 0.3rem;
}

article ol {
  counter-reset: list-counter;
}

article ol li {
  counter-increment: list-counter;
}

article ol li::marker {
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--color-accent);
}

article .note {
  background: rgba(127, 82, 255, 0.06);
  border-radius: 8px;
  padding: 1.2rem 1.5rem;
  margin: 2rem 0;
  font-size: 0.9rem;
}

article .note::before {
  content: "Note";
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

@media (max-width: 600px) {
  .article-card-wrapper {
    padding: 0 1.2rem 2rem;
    border-radius: 12px;
    margin-top: 3rem;
  }

  .article-header {
    padding: 2rem 0 1.8rem;
  }

  .article-header h1 {
    font-size: 1.35rem;
  }

  article h2 {
    font-size: 1.15rem;
    margin: 2.5rem 0 0.8rem;
  }

  article h3 {
    font-size: 1.02rem;
    margin: 2rem 0 0.6rem;
  }

  article h4 {
    font-size: 0.95rem;
    margin: 1.5rem 0 0.5rem;
  }

  .index-header {
    padding: 1.2rem 0 0.3rem;
  }

  .index-header h1 {
    font-size: 1rem;
  }

  .profile-section {
    padding: 4rem 0 0;
  }

  .profile-section h1 {
    font-size: 1.6rem;
  }

  .social-icon {
    width: 36px;
    height: 36px;
  }

  .article-list {
    grid-template-columns: 1fr;
  }

  .article-card {
    padding: 1.2rem 1.4rem;
  }

  .article-card h2 {
    font-size: 1.2rem;
    min-height: calc(1.2rem * 1.4 * 2);
  }

  main {
    padding: 1rem 0 3.5rem;
  }

  article pre {
    padding: 1.2rem 1.4rem;
    border-radius: 6px;
    margin: 1.5rem -1rem;
    border-radius: 0;
  }

  article blockquote {
    padding: 0.6rem 0 0.6rem 1.2rem;
  }

  .tags {
    gap: 0.4rem;
  }

  .tag {
    font-size: 0.7rem;
    padding: 0.2rem 0.6rem;
  }

  .article-card .summary {
    font-size: 0.82rem;
    margin-top: 0.5rem;
  }

  .pagination {
    gap: 1rem;
    padding: 1.5rem 0;
  }

  .pagination a,
  .pagination span {
    font-size: 0.85rem;
    padding: 0.5rem 1rem;
  }
}

/* @media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }
} */

/* Prism.js Syntax Highlighting (VS Code Dark+ theme) */
.token.comment,
.token.block-comment,
.token.prolog,
.token.doctype,
.token.cdata {
  color: #6a9955;
  font-style: italic;
}

.token.punctuation {
  color: #d4d4d4;
}

.token.property,
.token.tag,
.token.boolean,
.token.number,
.token.constant,
.token.symbol,
.token.deleted {
  color: #b5cea8;
}

.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin,
.token.inserted {
  color: #ce9178;
}

.token.operator,
.token.entity,
.token.url {
  color: #d4d4d4;
}

.token.atrule,
.token.attr-value,
.token.keyword {
  color: #569cd6;
}

.token.function,
.token.class-name {
  color: #dcdcaa;
}

.token.regex,
.token.important,
.token.variable {
  color: #d16969;
}

.token.annotation {
  color: #dcdcaa;
}

.token.namespace {
  color: #4ec9b0;
}

/* GitHub Gist Dark Theme */
.gist {
  margin: 2rem 0;
}

.gist .gist-file {
  border: none !important;
  border-radius: 8px !important;
  overflow: hidden;
}

.gist .gist-data {
  background: var(--color-code-bg) !important;
  border: none !important;
}

.gist .blob-wrapper {
  border-radius: 8px 8px 0 0;
}

.gist .blob-code {
  background: var(--color-code-bg) !important;
  color: var(--color-code-text) !important;
  font-family: var(--font-mono) !important;
  font-size: 0.82rem !important;
  line-height: 1.7 !important;
  border: none !important;
  padding: 0 1rem !important;
}

.gist .blob-num {
  background: var(--color-code-bg) !important;
  color: #6e7681 !important;
  border: none !important;
  padding: 0 0.8rem !important;
}

.gist .gist-meta {
  background: #EEEEEE !important;
  /* color: #586069 !important;
    border: none !important;
    border-radius: 0 0 8px 8px;
    padding: 0.6rem 1rem !important;
    font-family: var(--font-mono) !important;
    font-size: 0.75rem !important; */
}

/* .gist .gist-meta a {
    color: var(--color-accent) !important;
}

.gist .gist-meta a:hover {
    text-decoration: underline;
} */

.gist .pl-c {
  color: #6a9955 !important;
}

.gist .pl-k {
  color: #569cd6 !important;
}

.gist .pl-s,
.gist .pl-pds {
  color: #ce9178 !important;
}

.gist .pl-en {
  color: #dcdcaa !important;
}

.gist .pl-smi {
  color: #9cdcfe !important;
}

.gist .pl-c1 {
  color: #b5cea8 !important;
}