/*
 * Visual direction: a maintained technical worklog.
 * Flat drafting surfaces replace the previous glass-card system; cobalt reads
 * as ink, orange as a calibration mark, and mono labels carry file metadata.
 */

:root {
  --bg: #e9edef;
  --surface: #f8faf9;
  --surface-strong: #ffffff;
  --text: #18212b;
  --muted: #687480;
  --line: #c7d0d6;
  --line-strong: #9eabb4;
  --accent: #245b9b;
  --accent-strong: #173f72;
  --signal: #df673d;
  --shadow: none;
  --page-gutter: clamp(18px, 4vw, 58px);
  --wide-width: 1360px;
  --content-width: 1240px;
}

:root[data-theme='dark'] {
  --bg: #171d23;
  --surface: #202830;
  --surface-strong: #26303a;
  --text: #e8edf2;
  --muted: #9eabb6;
  --line: #3b4650;
  --line-strong: #596773;
  --accent: #87add9;
  --accent-strong: #b8d0ed;
  --signal: #f08b66;
  --shadow: none;
}

body {
  color: var(--text);
  font-family: Inter, "Segoe UI Variable Text", "Microsoft YaHei UI", "PingFang SC", system-ui, sans-serif;
  line-height: 1.68;
  background-color: var(--bg);
  background-image:
    linear-gradient(color-mix(in srgb, var(--line) 36%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--line) 36%, transparent) 1px, transparent 1px);
  background-size: 48px 48px;
  background-attachment: fixed;
}

button,
input,
textarea,
select {
  font: inherit;
}

:where(a, button):focus-visible {
  outline: 3px solid color-mix(in srgb, var(--signal) 75%, transparent);
  outline-offset: 3px;
}

.site-header {
  top: 0;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 94%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav {
  width: min(var(--wide-width), calc(100% - (var(--page-gutter) * 2)));
  min-height: 68px;
  border: 0;
  border-radius: 0;
  padding: 0;
  overflow: visible;
  background: transparent;
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.nav::before {
  display: none;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  width: fit-content;
  font-family: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  font-size: 1.12rem;
  font-weight: 760;
  letter-spacing: -0.04em;
}

.brand i {
  color: var(--signal);
  font-style: normal;
  font-weight: 500;
}

.nav-links {
  gap: 2px;
  font-size: 0.86rem;
  font-weight: 650;
}

.nav-links a,
.nav-random,
.nav-search,
.nav-console,
.theme-toggle,
.nav-menu-toggle {
  border-radius: 2px;
  padding: 8px 10px;
}

.nav-links a:hover,
.nav-random:hover,
.nav-search:hover,
.nav-console:hover,
.theme-toggle:hover,
.nav-menu-toggle:hover {
  border-color: transparent;
  color: var(--accent-strong);
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  box-shadow: inset 0 -2px 0 var(--accent);
  transform: none;
}

.hero {
  min-height: 440px;
}

.home-hero {
  position: relative;
  grid-template-columns: minmax(360px, 0.9fr) minmax(420px, 1.1fr);
  gap: clamp(42px, 8vw, 118px);
  border-bottom: 1px solid var(--line-strong);
}

.home-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -5px;
  width: 72px;
  height: 9px;
  background: var(--signal);
}

.hero-copy {
  position: relative;
  padding-left: clamp(24px, 4vw, 52px);
}

.hero-copy::before {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 6px;
  left: 0;
  width: 7px;
  background: var(--accent);
}

.hero-copy::after {
  content: "";
  position: absolute;
  top: 4px;
  left: 0;
  width: 7px;
  height: 38px;
  background: var(--signal);
}

.hero-kicker,
.hero-route,
.section-heading p,
.profile-identity span,
.post-card-index,
.hero-talk-head,
.article-summary-brand,
.article-summary-model {
  font-family: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
}

.hero-kicker {
  display: flex;
  justify-content: space-between;
  max-width: 410px !important;
  margin: 0 0 24px !important;
  color: var(--muted) !important;
  font-size: 0.72rem !important;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.hero h1 {
  display: flex;
  align-items: baseline;
  margin: 0;
  color: var(--text);
  font-family: "Arial Narrow", "Bahnschrift SemiCondensed", "Aptos Display", sans-serif;
  font-size: clamp(4.5rem, 9vw, 8.3rem);
  font-stretch: condensed;
  font-weight: 750;
  letter-spacing: -0.075em;
  line-height: 0.82;
}

.hero h1 em {
  color: var(--signal);
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 0.33em;
  font-style: normal;
  font-weight: 600;
  letter-spacing: -0.06em;
}

.hero .hero-intro {
  max-width: 520px;
  margin-top: 30px;
  color: var(--text);
  font-size: clamp(1.08rem, 2vw, 1.38rem);
  font-weight: 700;
}

.hero .hero-route {
  max-width: 540px;
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.77rem;
  letter-spacing: 0.025em;
}

.hero-talk {
  max-width: none;
  min-height: 190px;
  border: 0;
  border-top: 3px solid var(--text);
  border-bottom: 1px solid var(--line-strong);
  border-radius: 0;
  padding: 14px 0 10px;
  background: transparent;
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.hero-talk-head {
  margin: 0 0 8px;
  color: var(--text);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
}

.hero-talk-head > span {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.hero-talk-head small {
  color: var(--muted);
  font-family: inherit;
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0;
}

.hero-talk-head a {
  width: 30px;
  height: 30px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  color: var(--accent);
  background: transparent;
}

.hero-talk-head a:hover {
  color: #fff;
  background: var(--accent);
  transform: none;
}

.hero-talk .item {
  min-height: 42px;
  border-top: 1px solid var(--line);
  padding: 9px 4px;
  color: var(--text);
  font-size: 0.9rem;
}

.hero-talk .item::before {
  width: 9px;
  height: 3px;
  border-radius: 0;
  background: var(--signal);
  box-shadow: none;
}

.content-wrap {
  margin-top: 56px;
}

.home-layout {
  grid-template-columns: minmax(0, 1fr) 292px;
  gap: clamp(34px, 6vw, 72px);
}

.section-heading {
  align-items: end;
  margin-bottom: 0;
  border-bottom: 3px solid var(--text);
  padding-bottom: 14px;
}

.section-heading p {
  margin: 0 0 4px;
  color: var(--accent);
  font-size: 0.68rem;
  font-weight: 750;
  letter-spacing: 0.1em;
}

.section-heading h2,
.content-wrap h1 {
  font-family: "Arial Narrow", "Bahnschrift SemiCondensed", "Microsoft YaHei UI", sans-serif;
  font-size: clamp(1.75rem, 3vw, 2.35rem);
  font-weight: 720;
  letter-spacing: -0.04em;
}

.section-heading a {
  padding-bottom: 3px;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.section-heading a span {
  color: var(--signal);
}

@media (min-width: 960px) {
  .post-list {
    grid-template-columns: 1fr;
  }
}

.post-list {
  display: grid;
  gap: 0;
}

.post-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  padding: 0;
  background: color-mix(in srgb, var(--surface) 72%, transparent);
  box-shadow: none;
  transition: background-color 0.18s ease;
}

.post-card:hover {
  background: var(--surface-strong);
}

.post-card-main {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr) 28px;
  gap: clamp(14px, 3vw, 28px);
  align-items: start;
  padding: 24px 18px 16px 0;
}

.post-card-index {
  display: grid;
  align-content: start;
  min-height: 58px;
  border-left: 5px solid var(--accent);
  padding-left: 10px;
  color: var(--muted);
  line-height: 1;
}

.post-card-index small {
  color: var(--signal);
  font-size: 0.58rem;
  font-weight: 800;
  letter-spacing: 0.11em;
}

.post-card-index strong {
  margin-top: 8px;
  color: var(--text);
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
}

.post-card-copy {
  display: grid;
  min-width: 0;
}

.post-card-copy time {
  margin-bottom: 6px;
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 0.71rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.post-card-title {
  color: var(--text);
  font-size: clamp(1.18rem, 2.2vw, 1.48rem);
  font-weight: 720;
  letter-spacing: -0.025em;
  line-height: 1.32;
}

.post-card-summary {
  display: -webkit-box;
  margin-top: 8px;
  overflow: hidden;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.65;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.post-card-open {
  color: var(--line-strong);
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 1.05rem;
  transition: color 0.18s ease, transform 0.18s ease;
}

.post-card-main:hover .post-card-open {
  color: var(--signal);
  transform: translate(2px, -2px);
}

.post-card .meta-list {
  margin: 0 18px 18px 104px;
}

.meta-list {
  gap: 7px 15px;
}

.meta-list a,
.article-tag-list a,
.post-copyright-tags a {
  border: 0;
  border-radius: 0;
  padding: 0;
  color: var(--accent);
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 0.73rem;
  font-weight: 650;
  background: transparent;
  box-shadow: none;
}

.meta-list a + a::before {
  content: "/";
  margin-right: 15px;
  color: var(--line-strong);
}

.home-sidebar,
.sticky-sidebar {
  gap: 0;
}

.sidebar-card {
  border: 0;
  border-top: 1px solid var(--line-strong);
  border-radius: 0;
  padding: 20px 0;
  background: transparent;
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.sidebar-card:first-child {
  border-top: 3px solid var(--text);
}

.sidebar-card h2 {
  margin-bottom: 14px;
  color: var(--text);
  font-size: 0.92rem;
  letter-spacing: -0.01em;
}

.notice-card h2 span {
  color: var(--signal);
  font-size: 0.6rem;
}

.profile-card {
  text-align: left;
}

.profile-identity {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 14px;
  align-items: center;
}

.profile-identity > div {
  display: grid;
  gap: 3px;
}

.profile-identity span {
  color: var(--signal);
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.profile-avatar {
  width: 68px;
  height: 68px;
  margin: 0;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  box-shadow: 5px 5px 0 var(--accent);
}

.profile-name {
  margin: 0;
  color: var(--text);
  font-family: "Arial Narrow", "Bahnschrift SemiCondensed", sans-serif;
  font-size: 1.6rem;
  font-weight: 760;
  letter-spacing: -0.04em;
}

.profile-bio {
  margin: 20px 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.profile-stats {
  gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-bottom: 16px;
}

.profile-stats a {
  gap: 0;
  padding: 10px 6px;
}

.profile-stats a + a {
  border-left: 1px solid var(--line);
}

.profile-stats strong {
  color: var(--text);
  font-family: "Cascadia Code", Consolas, monospace;
}

.follow-button {
  justify-content: space-between;
  border: 0;
  border-radius: 2px;
  padding: 10px 13px;
  color: #fff;
  background: var(--accent);
  box-shadow: none;
}

.follow-button:hover {
  color: #fff;
  background: var(--accent-strong);
  transform: none;
}

.profile-links {
  justify-content: flex-start;
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 0.72rem;
}

.calendar-grid .today {
  border-radius: 2px;
  color: #fff;
  background: var(--signal);
  box-shadow: none;
}

.schedule-row progress {
  accent-color: var(--accent);
}

.sidebar-card h2 em {
  border-radius: 2px;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}

.toc-link.is-active {
  border-left: 3px solid var(--signal);
  border-radius: 0;
  padding-left: 9px;
  color: var(--accent-strong) !important;
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  transform: none;
}

.toc-marker,
.toc-group.is-open .toc-link-main .toc-marker,
.toc-link.is-active .toc-marker {
  width: 8px;
  height: 3px;
  border-radius: 0;
  background: var(--signal);
  box-shadow: none;
}

.page-header-card,
.article,
.article-summary-card,
.post-copyright-card,
.twikoo-comments,
.stats-chart,
.term-grid a,
.pagination-link,
.pagination-number,
.native-feature-grid section,
.friend-link-card,
.external-redirect-panel,
.post-changelog,
.table-scroll {
  border-color: var(--line);
  border-radius: 2px;
  background: var(--surface);
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.page-header-card {
  overflow: visible;
  border: 0;
  border-left: 8px solid var(--accent);
  margin-top: 56px;
  padding: 24px clamp(24px, 5vw, 52px);
}

.page-header-card::after {
  top: 0;
  right: auto;
  left: -8px;
  width: 8px;
  height: 34px;
  border-radius: 0;
  background: var(--signal);
}

.page-header-eyebrow {
  color: var(--signal);
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page-header-card h1,
.content-wrap .page-header-card h1 {
  color: var(--text);
  font-family: "Arial Narrow", "Bahnschrift SemiCondensed", "Microsoft YaHei UI", sans-serif;
  font-weight: 750;
  letter-spacing: -0.045em;
}

.post-layout {
  gap: 38px;
}

.article {
  border: 1px solid var(--line);
  border-top: 5px solid var(--accent);
  border-radius: 0;
  background: var(--surface);
}

.article-header-cover,
.article-header-cover-img,
.prose img,
.prose .fancybox {
  border-radius: 0;
}

.article-header h1,
.article-header-cover h1 {
  font-family: "Arial Narrow", "Bahnschrift SemiCondensed", "Microsoft YaHei UI", sans-serif;
  font-weight: 760;
  letter-spacing: -0.045em;
}

.article-summary-card {
  border: 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  padding: 17px 0 19px;
  background: transparent;
}

.article-summary-card::before {
  display: none;
}

.article-summary-header {
  margin-bottom: 9px;
}

.article-summary-brand {
  color: var(--accent-strong);
  font-size: 0.75rem;
}

.article-summary-icon {
  width: auto;
  height: auto;
  border-radius: 0;
  color: var(--signal);
  background: transparent;
  box-shadow: none;
}

.article-summary-model {
  border: 0;
  border-radius: 0;
  padding: 0;
  color: var(--muted);
  background: transparent;
  letter-spacing: 0;
}

.article-summary-content {
  color: var(--text);
  font-family: inherit;
  line-height: 1.72;
}

.article-summary-caret {
  display: none;
}

.prose :not(pre) > code {
  border-color: var(--line);
  border-radius: 2px;
  color: var(--accent-strong);
  background: color-mix(in srgb, var(--accent) 8%, var(--surface));
}

.prose .code-block {
  border-radius: 2px;
  box-shadow: none;
}

.custom-context-menu,
.control-console-panel,
.nav-menu {
  border-color: var(--line);
  border-radius: 3px;
  color: var(--text);
  background: var(--surface-strong);
  box-shadow: 8px 8px 0 color-mix(in srgb, var(--text) 14%, transparent);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.site-footer {
  border-top: 1px solid var(--line-strong);
  color: var(--muted);
  background: var(--surface);
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.footer-brand,
:root[data-theme='dark'] .footer-brand {
  color: var(--text);
  font-family: "Cascadia Code", Consolas, monospace;
}

.footer-brand img {
  border-radius: 2px;
  box-shadow: 3px 3px 0 var(--accent);
}

.footer-socials a {
  border-color: var(--line);
  border-radius: 2px;
  color: var(--text);
  background: transparent;
  box-shadow: none;
}

:root[data-theme='dark'] :where(
  .page-header-card,
  .post-card,
  .sidebar-card,
  .article,
  .article-summary-card,
  .post-copyright-card,
  .twikoo-comments,
  .table-scroll,
  .stats-chart,
  .term-grid a,
  .pagination-link,
  .pagination-number,
  .native-feature-grid section,
  .friend-link-card,
  .external-redirect-panel,
  .post-changelog
) {
  border-color: var(--line);
  background: var(--surface);
  box-shadow: none;
}

:root[data-theme='dark'] :where(
  .page-header-card h1,
  .content-wrap .page-header-card h1,
  .sidebar-card h2,
  .profile-name,
  .article-summary-content
) {
  color: var(--text);
  text-shadow: none;
}

:root[data-theme='dark'] .site-footer,
:root[data-theme='dark'] .footer-socials a {
  color: var(--muted);
  background: var(--surface);
  box-shadow: none;
}

@media (max-width: 1100px) {
  .home-layout {
    grid-template-columns: 1fr;
  }

  .home-hero {
    gap: 34px;
    padding-top: 72px;
    padding-bottom: 52px;
  }

  .home-sidebar {
    border-top: 3px solid var(--text);
    gap: 0 32px;
  }

  .home-sidebar > .sidebar-card:first-child,
  .sticky-sidebar > .sidebar-card:first-child {
    border-top-width: 1px;
  }
}

@media (max-width: 720px) {
  .site-header {
    padding: 0 var(--page-gutter);
  }

  .nav {
    width: 100%;
    min-height: 60px;
    border-radius: 0;
    padding: 8px 0;
  }

  .nav-menu {
    top: calc(env(safe-area-inset-top, 0px) + 66px);
    right: var(--page-gutter);
    border-radius: 3px;
    padding: 10px;
    background: var(--surface-strong);
    box-shadow: 7px 7px 0 color-mix(in srgb, var(--text) 16%, transparent);
  }

  .nav-links a,
  .nav-random,
  .nav-search,
  .nav-console,
  .theme-toggle {
    border-color: var(--line);
    border-radius: 2px;
    background: transparent;
  }

  .hero {
    min-height: 0;
  }

  .home-hero {
    padding-top: 58px;
    padding-bottom: 42px;
  }

  .hero-copy {
    padding-left: 22px;
  }

  .hero h1 {
    font-size: clamp(4rem, 25vw, 6.2rem);
  }

  .hero-kicker {
    max-width: 100% !important;
  }

  .hero-talk-head small {
    display: none;
  }

  .content-wrap {
    margin-top: 38px;
  }

  .post-card-main {
    grid-template-columns: 58px minmax(0, 1fr) 18px;
    gap: 12px;
    padding-right: 6px;
  }

  .post-card-index {
    min-height: 50px;
    border-left-width: 4px;
    padding-left: 8px;
  }

  .post-card-summary {
    -webkit-line-clamp: 3;
  }

  .post-card .meta-list {
    margin-left: 70px;
  }

  .home-sidebar {
    display: grid;
    grid-template-columns: 1fr;
  }

  .sticky-sidebar {
    display: grid;
    grid-template-columns: 1fr;
  }

  .page-header-card {
    margin-top: 34px;
    padding: 20px;
  }

  .article {
    border-right: 0;
    border-left: 0;
  }

  .footer-inner {
    text-align: left;
  }

  .footer-top,
  .footer-meta {
    justify-items: start;
    text-align: left;
  }

  .footer-contact {
    justify-items: start;
    text-align: left;
  }

  .footer-bottom {
    align-items: flex-start;
    text-align: left;
  }
}

@media (prefers-reduced-motion: reduce) {
  .post-card-open,
  .post-card,
  .nav-links a,
  .nav-random,
  .nav-search,
  .nav-console,
  .theme-toggle {
    transition: none;
  }
}