/* 基础层：重置、排版原语、按钮、页头、页脚。
   规则取自 impeccable.style 的 kinpaku 设计系统 —— 类名与数值均保持原样，
   只在必要时补充少量本站独有的选择器。 */

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizelegibility;
  overflow-x: clip;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-paper);
  min-height: 100dvh;
  font-size: 16px;
  line-height: 1.625;
  overflow-x: clip;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
}

h1,
h2,
h3,
h4,
h5,
h6,
p,
figure,
blockquote {
  margin: 0;
}

::selection {
  color: var(--ks-paper-raised);
  background: var(--ks-patina);
}

:focus-visible {
  outline: 2px solid var(--ks-focus-ring);
  outline-offset: 2px;
}

code {
  color: var(--ks-code-fg);
  background: var(--ks-code-bg);
  border-radius: var(--ks-code-radius);
  font-family: var(--ks-mono);
  padding: var(--ks-code-pad);
  border: 0;
  font-size: 0.88em;
}

.skip-link {
  position: absolute;
  left: -9999px;
}

.skip-link:focus {
  left: 12px;
  top: 12px;
  z-index: 200;
  padding: 8px 14px;
  background: var(--ks-patina);
  color: var(--ks-on-gold);
  border: 1px solid var(--ks-patina);
  border-radius: var(--ks-radius-sm);
}

/* ---------- 版心 ---------- */

.site-content {
  max-width: var(--width-max);
  padding: 0 var(--spacing-lg);
  margin: 0 auto;
}

/* 首页沿用原站的宽版心 */
.home-kinpaku .site-content {
  max-width: 1500px;
  padding: 0 clamp(22px, 4vw, 56px);
}

/* ---------- 区块与排版原语 ---------- */

.section {
  padding-block: calc(var(--ks-section-pad) / 2);
}

.ks-eyebrow {
  font-family: var(--ks-mono);
  font-size: var(--ks-type-eyebrow-size);
  letter-spacing: var(--ks-type-eyebrow-track);
  text-transform: uppercase;
  color: var(--ks-text-muted);
}

.ks-eyebrow--gold {
  color: var(--ks-kinpaku-deep);
}

.section-header {
  gap: 12px;
  margin-bottom: 34px;
  display: grid;
  max-width: 68ch;
}

.section-header--center {
  justify-items: center;
  text-align: center;
  margin-inline: auto;
}

.section-title {
  font-family: var(--ks-font-display);
  font-weight: var(--ks-type-headline-weight);
  font-size: var(--ks-type-headline-size);
  line-height: var(--ks-type-headline-line);
  letter-spacing: var(--ks-type-headline-track);
  color: var(--ks-ink);
  text-wrap: balance;
}

.section-lead {
  max-width: 62ch;
  color: var(--ks-text);
  font-size: var(--ks-type-body-size);
  line-height: 1.8;
  text-wrap: pretty;
}

/* ---------- 按钮：原站 .ks-button 全家桶 ---------- */

.ks-button {
  min-height: var(--ks-control-lg);
  border-radius: var(--ks-radius-sm);
  font-family: var(--ks-font);
  letter-spacing: -0.005em;
  cursor: pointer;
  transition: background-color var(--ks-quick) var(--ks-ease), border-color var(--ks-quick) var(--ks-ease),
    color var(--ks-quick) var(--ks-ease);
  border: 1px solid #0000;
  justify-content: center;
  align-items: center;
  gap: 12px;
  padding: 0 22px;
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1;
  text-decoration: none;
  display: inline-flex;
  position: relative;
}

.ks-button .ks-button-arrow {
  flex: none;
  width: 16px;
  height: 8px;
  display: inline-block;
}

.ks-button-arrow svg {
  width: 100%;
  height: 100%;
  display: block;
  overflow: visible;
}

.ks-button-arrow path {
  d: path("M0 4C5 4 9 4 14 4M10 0L14 4L10 8");
  transition: d 0.42s var(--ks-ease);
}

.ks-button[href^="#"]:hover .ks-button-arrow path,
.ks-button:hover .ks-button-arrow.is-down path {
  d: path("M0 4C7 4 11 4 11 11M7 7L11 11L15 7");
}

.ks-button.ks-button-primary {
  color: var(--ks-paper-raised);
  background: var(--ks-ink);
  border-color: var(--ks-ink);
}

.ks-button.ks-button-primary .ks-button-arrow {
  color: var(--ks-kinpaku);
}

.ks-button.ks-button-primary:hover {
  color: var(--ks-paper-raised);
  background: var(--ks-text);
  border-color: var(--ks-text);
}

.ks-button.ks-button-primary:active {
  background: oklch(8% 0 0);
  border-color: oklch(8% 0 0);
}

.ks-button.ks-button-secondary {
  color: var(--ks-ink);
  background: var(--ks-paper-raised);
  border-color: var(--ks-edge);
}

.ks-button.ks-button-secondary:hover {
  color: var(--ks-ink);
  border-color: var(--ks-ink);
}

.ks-button.ks-button-secondary:active {
  background: var(--ks-gray);
}

.ks-button.ks-button-ghost {
  color: var(--ks-ink);
  background: 0 0;
  border-color: #0000;
  padding: 0 12px;
}

.ks-button.ks-button-ghost:hover {
  color: var(--ks-accent-ink);
}

.ks-button[disabled],
.ks-button.ks-button-disabled {
  color: var(--ks-text-mute-deep);
  border-color: var(--ks-rule);
  cursor: not-allowed;
  background: 0 0;
  transform: none !important;
}

.ks-button:focus-visible {
  outline: 2px solid var(--ks-focus-ring);
  outline-offset: 3px;
}

.ks-button-row {
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  display: flex;
}

/* ---------- 页头 ---------- */

.site-header {
  z-index: 100;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
  padding: 14px clamp(var(--spacing-md), 4vw, var(--spacing-2xl));
  background: color-mix(in oklch, var(--color-paper) 94%, transparent);
  backdrop-filter: saturate(1.4) blur(16px);
  border-bottom: 1px solid var(--color-mist);
  display: flex;
  position: sticky;
  top: 0;
}

.site-header-brand {
  font-family: var(--font-display);
  font-size: var(--ks-type-subhead-size);
  letter-spacing: -0.01em;
  color: var(--color-ink);
  transition: color var(--duration-fast) var(--ease-out);
  flex-shrink: 0;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  display: inline-flex;
  text-decoration: none;
}

.site-header-brand-logo {
  width: 26px;
  height: 26px;
  color: var(--color-ink);
  flex-shrink: 0;
}

.site-header-right {
  align-items: center;
  gap: clamp(var(--spacing-sm), 2vw, var(--spacing-md));
  min-width: 0;
  display: flex;
}

.site-header-nav {
  align-items: center;
  gap: clamp(var(--spacing-sm), 2vw, var(--spacing-md));
  font-family: var(--font-body);
  min-width: 0;
  font-size: 0.9375rem;
  font-weight: 500;
  display: flex;
}

.site-header-nav a {
  white-space: nowrap;
  color: var(--color-charcoal);
  transition: color var(--duration-fast) var(--ease-out);
  padding: 4px 0;
  display: inline-block;
  position: relative;
  text-decoration: none;
}

.site-header-nav a:hover {
  color: var(--color-ink);
}

.site-header-github {
  border-radius: var(--ks-radius-pill);
  background: var(--color-cream);
  border: 1px solid var(--color-mist);
  font-family: var(--font-mono);
  color: var(--color-charcoal);
  transition: background var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
  flex-shrink: 0;
  align-items: center;
  gap: 6px;
  padding: 4px 10px 4px 8px;
  font-size: 0.8125rem;
  font-weight: 500;
  display: inline-flex;
  text-decoration: none;
}

.site-header-github svg {
  width: 14px;
  height: 14px;
}

.site-header-github-star {
  color: var(--color-accent);
  flex-shrink: 0;
  width: 12px;
  height: 12px;
}

.site-header-menu {
  border: 1px solid var(--ks-edge);
  border-radius: var(--ks-radius-sm);
  cursor: pointer;
  background: 0 0;
  flex-direction: column;
  flex: none;
  justify-content: center;
  align-items: center;
  gap: 6px;
  width: 36px;
  height: 36px;
  margin-left: auto;
  padding: 0;
  transition: border-color 0.16s, background 0.16s;
  display: none;
}

.site-header-menu:hover {
  border-color: var(--ks-ink);
  background: var(--ks-paper-raised);
}

.site-header-menu-line {
  background: var(--ks-ink);
  width: 16px;
  height: 1.5px;
  transition: transform 0.2s, opacity 0.2s;
  display: block;
}

[data-site-header][data-nav-open="true"] .site-header-menu-line:first-child {
  transform: translateY(3.75px) rotate(45deg);
}

[data-site-header][data-nav-open="true"] .site-header-menu-line:nth-child(2) {
  transform: translateY(-3.75px) rotate(-45deg);
}

/* kinpaku-chrome 作用域：首页与子页实际生效的观感 */

.kinpaku-chrome .site-header {
  border-bottom: 1px solid var(--ks-rule);
  backdrop-filter: blur(12px);
  background: oklch(97.8% 0 0 / 0.92);
  padding: 18px max(clamp(22px, 4vw, 56px), 50% - 694px);
}

.kinpaku-chrome .site-header-brand {
  color: var(--ks-ink);
  font-family: var(--ks-font);
  align-items: center;
  gap: 4px;
  text-decoration: none;
  display: inline-flex;
}

.kinpaku-chrome .site-header-brand-logo {
  width: 38px;
  height: 38px;
  color: var(--ks-ink);
  box-shadow: none;
  background: 0 0;
  place-items: center;
  margin-left: -6px;
  display: grid;
}

.kinpaku-chrome .site-header-brand-logo img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.kinpaku-chrome .site-header-brand-name {
  display: inline-block;
  position: relative;
  top: 1px;
}

.kinpaku-chrome .site-header-brand-name,
.kinpaku-chrome .footer-logo {
  color: var(--ks-ink);
  font-family: var(--ks-font-wordmark);
  font-weight: 500;
  font-size: var(--ks-type-wordmark-size);
  letter-spacing: var(--ks-type-wordmark-track);
  text-transform: uppercase;
  -webkit-font-smoothing: auto;
  -moz-osx-font-smoothing: auto;
  line-height: 1;
}

.kinpaku-chrome .site-header-nav {
  font-family: var(--ks-font);
  gap: clamp(22px, 3vw, 48px);
  font-size: 0.95rem;
  font-weight: 400;
}

.kinpaku-chrome .site-header-nav a,
.kinpaku-chrome .site-header-github {
  color: var(--ks-text-muted);
}

.kinpaku-chrome .site-header-nav a:hover,
.kinpaku-chrome .site-header-nav a[aria-current="page"] {
  color: var(--ks-ink);
}

.kinpaku-chrome .site-header-nav a[aria-current="page"]:after {
  content: "";
  background: var(--ks-patina);
  border-radius: 50%;
  width: 6px;
  height: 6px;
  position: absolute;
  inset: 50% auto auto -13px;
  transform: translateY(-50%);
}

.kinpaku-chrome .site-header-github {
  box-sizing: border-box;
  height: 36px;
  min-height: 36px;
  padding: 0 12px 0 10px;
  border: 1px solid var(--ks-rule);
  border-radius: var(--ks-radius-pill);
  background: var(--ks-paper-raised);
  color: var(--ks-ink);
  font-family: var(--ks-mono);
}

.kinpaku-chrome .site-header-github:hover {
  color: var(--ks-ink);
  border-color: var(--ks-ink);
}

.kinpaku-chrome .site-header-github-star {
  color: var(--ks-kinpaku);
}

.kinpaku-chrome .site-header-github-label {
  line-height: 1;
}

/* ---------- 页脚 ---------- */

.site-footer {
  border-top: 1px solid var(--color-mist);
  padding: var(--spacing-xl) var(--spacing-lg);
  background: var(--color-cream);
}

.footer-row {
  max-width: var(--width-max);
  align-items: center;
  gap: var(--spacing-xl);
  grid-template-columns: auto 1fr auto;
  margin: 0 auto;
  display: grid;
}

.footer-logo {
  font-family: var(--font-display);
  color: var(--color-ink);
  font-size: 1.25rem;
  font-weight: 400;
  text-decoration: none;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md);
}

.footer-links a {
  color: var(--color-ash);
  font-size: 0.875rem;
  text-decoration: none;
}

.footer-credit {
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--color-ash);
  font-size: 0.875rem;
  display: flex;
}

.footer-credit a {
  text-decoration: none;
}

.kinpaku-chrome .site-footer {
  background: var(--ks-paper-deep);
  border-top: 1px solid var(--ks-rule);
}

.kinpaku-chrome .footer-links a,
.kinpaku-chrome .footer-credit {
  color: var(--ks-text-muted);
}

.kinpaku-chrome .footer-credit a,
.kinpaku-chrome .footer-links a:hover,
.kinpaku-chrome .footer-credit a:hover {
  color: var(--ks-ink);
}

/* ---------- 滚动进场 ---------- */

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s var(--ks-ease), transform 0.5s var(--ks-ease);
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- 响应式 ---------- */

@media (max-width: 860px) {
  .kinpaku-chrome .site-header {
    flex-wrap: nowrap;
    padding: 16px clamp(16px, 4vw, 24px);
  }

  .site-header-menu {
    display: inline-flex;
    width: var(--ks-control-lg);
    height: var(--ks-control-lg);
  }

  [data-site-header] .site-header-right {
    overscroll-behavior: contain;
    background: var(--ks-paper-raised);
    border-radius: var(--ks-radius-md);
    border: 1px solid var(--ks-rule);
    max-height: calc(100dvh - 100px);
    box-shadow: var(--ks-lift-1);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--ks-settle) var(--ks-ease), transform var(--ks-settle) var(--ks-ease),
      visibility 0s linear var(--ks-settle);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    padding: 8px;
    display: flex;
    position: absolute;
    top: calc(100% + 12px);
    left: clamp(16px, 4vw, 24px);
    right: clamp(16px, 4vw, 24px);
    overflow-y: auto;
    transform: translateY(-8px);
  }

  [data-site-header][data-nav-open="true"] .site-header-right {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transition-delay: 0s;
    transform: translateY(0);
  }

  .site-header[data-site-header] .site-header-nav {
    border-bottom: 1px solid var(--ks-rule);
    flex-direction: column;
    flex-shrink: 0;
    align-items: stretch;
    gap: 0;
    padding-bottom: 8px;
    font-size: 1rem;
    overflow: visible;
    mask-image: none;
  }

  .site-header[data-site-header] .site-header-nav a {
    min-height: var(--ks-control-lg);
    border-radius: var(--ks-radius-sm);
    border-bottom: 0;
    padding: 12px 28px;
    line-height: 1.5;
    display: block;
  }

  .site-header[data-site-header] .site-header-nav a:hover,
  .site-header[data-site-header] .site-header-nav a[aria-current="page"] {
    background: var(--ks-paper-deep);
  }

  .site-header[data-site-header] .site-header-nav a[aria-current="page"]:after {
    left: 12px;
  }

  .site-header[data-site-header] .site-header-github {
    align-self: flex-start;
    margin: 12px 12px 4px;
  }

  .kinpaku-chrome .site-header-brand,
  .kinpaku-chrome .site-header-github {
    min-height: var(--ks-control-lg);
  }

  .site-header-brand {
    font-size: var(--ks-type-lead-size);
  }

  .site-header-brand-logo {
    width: 22px;
    height: 22px;
  }

  .kinpaku-chrome .site-header-nav a {
    min-height: var(--ks-control-lg);
    min-width: var(--ks-control-lg);
    padding-block: 10px;
  }

  .site-footer {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  .footer-row {
    grid-template-columns: minmax(0, 1fr);
    justify-items: center;
    text-align: center;
    gap: var(--spacing-md);
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header-right,
  .site-header-menu,
  .site-header-menu-line {
    transition: none;
  }
}