/* =========================================================
   千果官网 · 共享站点样式
   文件位置：/assets/site.css
   ========================================================= */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--topline-h) + 18px);
}

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, ol, ul { margin: 0; padding: 0; }

ol, ul { list-style: none; }

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

button {
  background: none;
  border: 0;
  padding: 0;
  font: inherit;
  color: inherit;
  cursor: pointer;
}

a { color: inherit; text-decoration: none; }

table { border-collapse: collapse; border-spacing: 0; width: 100%; }

hr { border: 0; margin: 0; }

/* ---------- 2. Tokens ---------- */
:root {
  --c-orange: #E4691E;
  --c-orange-lt: #F6A96B;
  --c-orange-dk: #B4470F;

  --c-green: #1F3D2E;
  --c-green-mid: #3F6B4F;
  --c-green-lt: #A8C6A0;

  --c-cream: #FBF6EE;
  --c-paper: #FFFFFF;
  --c-copper: #A9764A;
  --c-ink: #1A1A17;
  --c-gray: #6E6A61;

  --c-line: #E2D9CA;
  --c-copper-soft: rgba(169, 118, 74, .42);
  --c-green-soft: rgba(168, 198, 160, .24);
  --c-cream-soft: rgba(251, 246, 238, .16);

  --grad-orange: linear-gradient(180deg, #F6A96B 0%, #FBF6EE 100%);

  --rail-w: 272px;
  --topline-h: 64px;
  --radius: 2px;

  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", serif;
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --ease: cubic-bezier(.2, .6, .3, 1);
}

/* ---------- 3. Base typography ---------- */
body {
  font-family: var(--font-sans);
  font-size: 16.5px;
  font-weight: 400;
  line-height: 1.75;
  color: var(--c-ink);
  background-color: var(--c-cream);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--c-green);
}

h1 { font-size: clamp(30px, 4vw, 46px); }
h2 { font-size: clamp(24px, 3vw, 34px); }
h3 { font-size: clamp(19px, 2.2vw, 25px); }
h4 { font-size: clamp(16px, 1.6vw, 19px); }

.display {
  font-family: var(--font-serif);
  font-weight: 700;
  letter-spacing: 0;
  font-size: clamp(32px, 4.6vw, 56px);
  line-height: 1.2;
  color: var(--c-green);
}

.heading-serif {
  font-family: var(--font-serif);
  font-weight: 700;
  letter-spacing: .01em;
  line-height: 1.22;
}

.mono { font-family: var(--font-mono); }

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .01em;
}

p { line-height: 1.75; }

strong { font-weight: 900; }

.prose {
  max-width: 34em;
  font-size: clamp(16px, 1.02vw + 12.6px, 17px);
  line-height: 1.78;
  color: var(--c-ink);
}

.prose p + p { margin-top: 1.05em; }

.prose a {
  color: var(--c-orange-dk);
  border-bottom: 1px solid var(--c-copper-soft);
}

.prose a:hover { border-bottom-color: var(--c-orange-dk); }

/* ---------- 4. Focus & motion ---------- */
:focus-visible {
  outline: 2px solid var(--c-copper);
  outline-offset: 2px;
  border-radius: 1px;
}

.section--green :focus-visible,
.section--grad :focus-visible,
.site-footer :focus-visible {
  outline-color: var(--c-orange-lt);
}

[data-reveal] {
  transition: opacity .24s var(--ease), transform .24s var(--ease);
}

[data-reveal].is-hidden {
  opacity: 0;
  transform: translateY(8px);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 5. Layout helpers ---------- */
.container {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: clamp(18px, 4vw, 48px);
}

.section { padding-block: clamp(44px, 6vw, 84px); }
.section--tight { padding-block: clamp(26px, 4vw, 48px); }
.section--paper { background-color: var(--c-paper); }
.section--green { background-color: var(--c-green); color: var(--c-cream); }
.section--green h1,
.section--green h2,
.section--green h3,
.section--green h4 { color: var(--c-cream); }
.section--grad { background-image: var(--grad-orange); }

.grid { display: grid; gap: clamp(16px, 2.2vw, 28px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.hairline {
  height: 1px;
  background-color: var(--c-line);
  border: 0;
}

.rule-scale {
  height: 9px;
  border-bottom: 1px solid var(--c-copper-soft);
  background-image: repeating-linear-gradient(90deg,
    var(--c-copper-soft) 0 1px,
    transparent 1px 14px);
}

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px 24px;
  padding-bottom: 14px;
  margin-bottom: clamp(22px, 3vw, 36px);
  border-bottom: 1px solid var(--c-copper-soft);
}

.section__index {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--c-copper);
  display: block;
  margin-bottom: 8px;
}

.section__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(25px, 3.2vw, 40px);
  line-height: 1.2;
  color: var(--c-green);
}

.section--green .section__title { color: var(--c-cream); }
.section--green .section__index { color: var(--c-orange-lt); }

/* ---------- 6. Skip link ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 700;
  color: var(--c-cream);
  background-color: var(--c-green);
  border: 1px solid var(--c-copper);
  border-radius: var(--radius);
  transform: translateY(-200%);
  transition: transform .16s var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- 7. Header / topline ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
}

.topline {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  height: var(--topline-h);
  padding-inline: clamp(14px, 2.4vw, 26px);
  background-color: var(--c-paper);
  border-bottom: 1px solid var(--c-copper-soft);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.brand-mark {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  background-color: var(--c-orange);
  border-radius: var(--radius);
}

.brand-mark__core {
  display: block;
  width: 9px;
  height: 9px;
  background-color: var(--c-cream);
}

.brand-text { display: block; }

.brand-name {
  display: block;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 17px;
  line-height: 1.1;
  letter-spacing: .01em;
  color: var(--c-green);
}

.brand-sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .14em;
  line-height: 1.6;
  color: var(--c-copper);
}

.topline__note {
  margin-left: 10px;
  padding-left: 18px;
  border-left: 1px solid var(--c-line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--c-gray);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topline__actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}

.topline__cta { white-space: nowrap; }

.topline__progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  background-color: var(--c-orange);
  transform: scaleX(0);
  transform-origin: 0 50%;
  will-change: transform;
}

/* ---------- 8. Mobile nav toggle ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  font-size: 14px;
  font-weight: 700;
  color: var(--c-green);
  border: 1px solid var(--c-copper-soft);
  border-radius: var(--radius);
  transition: background-color .16s var(--ease), border-color .16s var(--ease);
}

.nav-toggle:hover {
  background-color: var(--c-cream);
  border-color: var(--c-copper);
}

.nav-toggle__bars {
  display: grid;
  gap: 3px;
  width: 16px;
}

.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  background-color: currentColor;
}

.nav-toggle__bars span:last-child { width: 11px; }

.nav-toggle__label { line-height: 1; }

/* ---------- 9. Left rail navigation ---------- */
.rail {
  position: fixed;
  top: var(--topline-h);
  left: 0;
  bottom: 0;
  z-index: 90;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overscroll-behavior: contain;
  background-color: var(--c-paper);
  border-right: 1px solid var(--c-line);
}

.rail__head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 22px 20px 14px;
}

.rail__head-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--c-copper);
}

.rail__head-rule {
  flex: 1;
  height: 1px;
  background-color: var(--c-copper-soft);
}

.rail__close {
  display: none;
  width: 30px;
  height: 30px;
  place-items: center;
  font-size: 19px;
  line-height: 1;
  color: var(--c-green);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.rail__close:hover { border-color: var(--c-copper); }

.rail__list { border-top: 1px solid var(--c-line); }

.rail__item { margin: 0; }

.rail__link {
  position: relative;
  display: grid;
  grid-template-columns: 32px 1fr;
  align-items: baseline;
  gap: 6px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--c-line);
  transition: background-color .16s var(--ease), box-shadow .16s var(--ease);
}

.rail__link:hover {
  background-color: var(--c-cream);
  box-shadow: inset 0 -1px 0 var(--c-copper);
}

.rail__link:hover .rail__text { color: var(--c-orange-dk); }

.rail__idx {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--c-copper);
}

.rail__text {
  font-size: 15px;
  font-weight: 500;
  color: var(--c-green);
  transition: color .16s var(--ease);
}

.rail__link[aria-current="page"] {
  background-color: var(--c-cream);
  box-shadow: inset 3px 0 0 var(--c-orange);
}

.rail__link[aria-current="page"] .rail__text {
  font-weight: 900;
  color: var(--c-ink);
}

.rail__link[aria-current="page"] .rail__idx { color: var(--c-orange-dk); }

.rail__foot {
  margin-top: auto;
  padding: 18px 20px 24px;
  border-top: 1px solid var(--c-copper-soft);
  background-image: linear-gradient(180deg, rgba(246, 169, 107, .16), rgba(251, 246, 238, 0));
}

.rail__foot-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--c-copper);
}

.rail__foot-value {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-green);
}

.rail__foot-note {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.62;
  color: var(--c-gray);
}

/* ---------- 10. Main content offset ---------- */
#main-content {
  margin-left: var(--rail-w);
  padding-top: var(--topline-h);
}

/* ---------- 11. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  text-align: center;
  transition: background-color .16s var(--ease), color .16s var(--ease),
              border-color .16s var(--ease), transform .16s var(--ease);
}

.btn--solid {
  background-color: var(--c-orange);
  border-color: var(--c-orange);
  color: #FFFFFF;
}

.btn--solid:hover {
  background-color: var(--c-orange-dk);
  border-color: var(--c-orange-dk);
  transform: translateY(-1px);
}

.btn--ghost {
  background-color: transparent;
  border-color: var(--c-copper);
  color: var(--c-green);
}

.btn--ghost:hover {
  background-color: var(--c-cream);
  border-color: var(--c-orange);
  color: var(--c-orange-dk);
}

.btn--sm { padding: 9px 14px; font-size: 14px; }

.btn--block { display: flex; width: 100%; }

/* ---------- 12. Breadcrumbs ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 10px;
  padding-top: 18px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--c-gray);
}

.breadcrumbs__sep { color: var(--c-copper); }

.breadcrumbs a { border-bottom: 1px solid transparent; }
.breadcrumbs a:hover {
  color: var(--c-orange-dk);
  border-bottom-color: var(--c-copper-soft);
}

/* ---------- 13. Cards, plaques, tags ---------- */
.card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(18px, 2.6vw, 30px);
  background-color: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  transition: transform .16s var(--ease), border-color .16s var(--ease),
              background-color .16s var(--ease);
}

.card:hover {
  transform: translateY(-2px);
  border-color: var(--c-copper);
}

.card__title {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(19px, 2vw, 24px);
  line-height: 1.2;
  color: var(--c-green);
}

.card__body {
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--c-ink);
}

.card__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-copper);
}

.plaque {
  position: relative;
  padding: 16px 18px;
  background-color: var(--c-paper);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-copper);
  border-radius: var(--radius);
}

.plaque__label {
  display: block;
  margin-bottom: 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--c-copper);
}

.plaque__text {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--c-gray);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--c-green-mid);
  background-color: var(--c-paper);
  border: 1px solid var(--c-copper-soft);
  border-radius: var(--radius);
}

.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  background-color: var(--c-orange);
  border-radius: 1px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  padding: 5px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-green-mid);
  background-color: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  transition: background-color .16s var(--ease), color .16s var(--ease),
              border-color .16s var(--ease);
}

.tag:hover { border-color: var(--c-copper); }

.tag.is-active,
.tag[aria-pressed="true"] {
  background-color: var(--c-orange);
  border-color: var(--c-orange);
  color: #FFFFFF;
}

/* ---------- 14. Lists ---------- */
.list-check { display: grid; gap: 10px; }

.list-check__item {
  position: relative;
  padding-left: 26px;
  font-size: 15.5px;
  line-height: 1.7;
}

.list-check__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: .58em;
  width: 12px;
  height: 12px;
  background-color: var(--c-cream);
  border: 1px solid var(--c-copper);
}

/* ---------- 15. Tables ---------- */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  background-color: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.table {
  min-width: 560px;
  font-size: 14.5px;
}

.table caption {
  padding: 14px 16px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-gray);
  border-bottom: 1px solid var(--c-line);
}

.table th,
.table td {
  padding: 12px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--c-line);
}

.table thead th {
  background-color: var(--c-green);
  color: var(--c-cream);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .04em;
  white-space: nowrap;
}

.table tbody tr:nth-child(even) { background-color: var(--c-green-soft); }
.table tbody tr:last-child td { border-bottom: 0; }

/* ---------- 16. Figures / responsive media frames ---------- */
.figure {
  background-color: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 10px;
}

.figure__media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background-image: var(--grad-orange);
  border-radius: 1px;
}

.figure__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.figure__cap {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 4px 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-gray);
}

.media--wide { aspect-ratio: 16 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }

/* ---------- 17. Footer ---------- */
.site-footer {
  margin-left: var(--rail-w);
  margin-top: clamp(40px, 6vw, 80px);
  background-color: var(--c-green);
  color: var(--c-cream);
  border-top: 2px solid var(--c-copper);
}

.footer__inner {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding: clamp(34px, 5vw, 62px) clamp(18px, 4vw, 48px) 26px;
}

.footer__brand {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 20px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--c-cream-soft);
}

.footer__brand-name {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 22px;
  line-height: 1.1;
  color: var(--c-cream);
}

.footer__brand-desc {
  max-width: 40em;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(251, 246, 238, .7);
}

.footer__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
  padding-top: 28px;
}

.footer__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 400;
  letter-spacing: .18em;
  color: var(--c-orange-lt);
}

.footer__list { display: grid; gap: 9px; }

.footer__link {
  display: inline-block;
  font-size: 14.5px;
  line-height: 1.5;
  color: rgba(251, 246, 238, .88);
  border-bottom: 1px solid transparent;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.footer__link:hover {
  color: var(--c-orange-lt);
  border-bottom-color: var(--c-copper);
}

.footer__text {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(251, 246, 238, .8);
}

.footer__text + .footer__text { margin-top: 7px; }

.footer__mono {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--c-cream);
  word-break: break-all;
}

.copy-btn {
  margin-left: 8px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--c-orange-lt);
  border: 1px solid var(--c-copper);
  border-radius: var(--radius);
  transition: background-color .16s var(--ease), color .16s var(--ease),
              border-color .16s var(--ease);
}

.copy-btn:hover {
  background-color: var(--c-copper);
  color: var(--c-green);
}

.copy-btn[data-copy-state="ok"] {
  border-color: var(--c-green-lt);
  color: var(--c-green-lt);
}

.copy-btn[data-copy-state="fail"] {
  border-color: var(--c-orange-lt);
  color: var(--c-orange-lt);
}

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid var(--c-cream-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: rgba(251, 246, 238, .62);
}

.footer__copy,
.footer__icp { line-height: 1.6; }

/* ---------- 18. Responsive ---------- */
@media (min-width: 961px) and (max-width: 1200px) {
  :root { --rail-w: 236px; }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 1024px) {
  .footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 960px) {
  .topline__note { display: none; }

  .nav-toggle { display: inline-flex; }

  .rail {
    top: 0;
    bottom: 0;
    width: min(84vw, 330px);
    z-index: 130;
    padding-top: 4px;
    border-right: 1px solid var(--c-copper);
    transform: translateX(-100%);
    visibility: hidden;
    transition: transform .22s var(--ease), visibility .22s linear;
  }

  .rail[data-open="true"] {
    transform: none;
    visibility: visible;
  }

  .rail__close { display: inline-grid; }

  #main-content { margin-left: 0; }

  .site-footer { margin-left: 0; }

  .grid--2,
  .grid--3 { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  :root { --topline-h: 58px; }

  .brand-sub { display: none; }

  .topline__cta { padding: 8px 12px; font-size: 13.5px; }

  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

@media (max-width: 460px) {
  .footer__grid { grid-template-columns: 1fr; }
  .nav-toggle__label { display: none; }
}

/* ---------- 19. Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  [data-reveal],
  [data-reveal].is-hidden {
    opacity: 1;
    transform: none;
  }

  .card:hover,
  .btn--solid:hover { transform: none; }
}