:root {
  --ink: #201a16;
  --muted: #6e6258;
  --line: #e9d8bf;
  --paper: #fffaf1;
  --white: #ffffff;
  --orange: #ff8617;
  --orange-dark: #d35f00;
  --leaf: #467a37;
  --apricot: #fff0d7;
  --shadow: 0 24px 60px rgba(117, 76, 30, .12);
  color-scheme: light;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, #fffdf8 0%, #fff7ea 48%, #ffffff 100%);
  line-height: 1.65;
  letter-spacing: 0;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.site-head {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 14px clamp(18px, 4vw, 52px);
  background: rgba(255, 250, 241, .92);
  border-bottom: 1px solid rgba(233, 216, 191, .9);
  backdrop-filter: blur(14px);
}
.brand-mark { display: inline-flex; align-items: center; gap: 10px; min-width: 0; }
.brand-mark span {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: conic-gradient(from 20deg, #fff2d7 0 10%, var(--orange) 10% 55%, #ffd06d 55% 74%, var(--orange-dark) 74% 100%);
  box-shadow: inset 0 0 0 2px #fff7e5;
}
.brand-mark strong { white-space: nowrap; font-size: 16px; }
.brand-mark em { font-style: normal; color: var(--muted); font-size: 13px; }
.site-nav { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; justify-content: flex-end; }
.site-nav a {
  padding: 9px 11px;
  border-radius: 8px;
  color: #483b31;
  font-size: 14px;
}
.site-nav a:hover, .site-nav a:focus-visible { background: var(--apricot); outline: none; }
.menu-toggle { display: none; border: 1px solid var(--line); background: var(--white); padding: 8px 12px; border-radius: 8px; color: var(--ink); }
main { overflow: hidden; }
.citrus-cover {
  display: grid;
  grid-template-columns: minmax(0, .92fr) minmax(320px, 1.08fr);
  gap: clamp(28px, 4vw, 58px);
  align-items: center;
  max-width: 1240px;
  margin: 0 auto;
  padding: clamp(40px, 6vw, 88px) clamp(18px, 4vw, 52px) 54px;
}
.cover-copy h1, .page-cover h1, .article-shell h1 {
  margin: 0;
  font-size: clamp(38px, 5.8vw, 78px);
  line-height: 1.02;
  max-width: 790px;
}
.cover-kicker, .eyebrow {
  margin: 0 0 14px;
  color: var(--orange-dark);
  font-weight: 800;
  text-transform: uppercase;
  font-size: 13px;
}
.cover-lead, .page-cover p {
  margin: 20px 0 0;
  color: var(--muted);
  font-size: clamp(17px, 2vw, 21px);
  max-width: 650px;
}
.cover-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.primary-action, .secondary-action, .line-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 11px 18px;
  border-radius: 8px;
  font-weight: 800;
  border: 1px solid var(--orange);
}
.primary-action { background: var(--orange); color: #fff; box-shadow: 0 16px 28px rgba(255, 134, 23, .2); }
.secondary-action, .line-link { background: #fff; color: var(--orange-dark); }
.primary-action.small { min-height: 38px; padding: 8px 14px; }
.cover-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
  max-width: 540px;
}
.cover-strip span {
  padding: 8px 10px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .76);
  border-radius: 8px;
  color: #5b4b3e;
  font-size: 13px;
}
.cover-visual {
  margin: 0;
  position: relative;
}
.cover-visual img {
  width: 100%;
  border-radius: 8px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(233, 216, 191, .75);
}
.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  max-width: 1180px;
  margin: 0 auto 22px;
}
.section-head h2 {
  margin: 0;
  font-size: clamp(26px, 3.4vw, 42px);
  line-height: 1.12;
}
.peel-rail, .smart-band, .platform-orchard, .guide-spread, .faq-strip, .page-cover, .split-panel, .device-track.detailed, .steps-strip, .context-grid, .latency-table, .plan-columns.full, .renewal-strip, .issue-basket, .article-ledger.wide, .support-strip, .text-spread, .contact-board {
  max-width: 1180px;
  margin: 0 auto;
  padding: 48px clamp(18px, 4vw, 52px);
}
.device-track {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  max-width: 1180px;
  margin: 0 auto;
}
.device-slice {
  background: rgba(255, 255, 255, .84);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
}
.device-slice h2, .device-slice h3 { margin: 0 0 8px; font-size: 20px; }
.device-slice p { margin: 9px 0 0; color: var(--muted); }
.slice-dot {
  display: inline-block;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: radial-gradient(circle at 45% 45%, #fff7dd 0 22%, var(--orange) 23% 100%);
  margin-bottom: 12px;
}
.slice-line { color: var(--orange-dark) !important; font-weight: 800; font-size: 14px; }
.scenario-list, .latency-table {
  display: grid;
  gap: 10px;
}
.scenario-row, .latency-row {
  display: grid;
  grid-template-columns: .7fr 1fr 1.5fr;
  gap: 18px;
  align-items: center;
  padding: 16px 18px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 8px;
}
.scenario-row strong, .latency-row strong { color: var(--orange-dark); }
.scenario-row span, .latency-row span { color: #40352d; }
.scenario-row p, .latency-row p { margin: 0; color: var(--muted); }
.plan-columns {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  max-width: 1180px;
  margin: 0 auto;
}
.plan-ticket {
  padding: 20px;
  background: var(--apricot);
  border: 1px dashed #efb36d;
  border-radius: 8px;
}
.plan-ticket h2, .plan-ticket h3 { margin: 0 0 10px; font-size: 20px; }
.plan-ticket p { margin: 0 0 12px; color: var(--muted); }
.plan-ticket small { color: var(--leaf); font-weight: 800; }
.article-ledger {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  max-width: 1180px;
  margin: 0 auto;
}
.article-ledger.wide { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.article-ledger article {
  padding: 18px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}
.article-ledger time, .article-ledger span {
  display: inline-block;
  margin-right: 8px;
  color: var(--orange-dark);
  font-size: 13px;
  font-weight: 800;
}
.article-ledger h3 { margin: 12px 0 8px; font-size: 19px; line-height: 1.25; }
.article-ledger p { margin: 0; color: var(--muted); }
.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  max-width: 1180px;
  margin: 0 auto;
}
details {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px 18px;
}
summary { cursor: pointer; font-weight: 800; }
details p { color: var(--muted); margin-bottom: 0; }
.page-cover {
  padding-top: clamp(44px, 7vw, 76px);
  border-bottom: 1px solid var(--line);
}
.page-cover.compact, .page-cover.download-orchard, .page-cover.route-grove, .page-cover.plan-counter, .page-cover.help-peel {
  background: linear-gradient(90deg, rgba(255, 240, 215, .72), rgba(255, 255, 255, .2));
}
.split-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}
.split-panel h2, .context-grid h2, .steps-strip h2, .renewal-strip h2, .text-spread h2 { margin-top: 0; }
.split-panel p, .context-grid p, .steps-strip li, .renewal-strip li, .text-spread p { color: var(--muted); }
.note-stack { display: grid; gap: 10px; }
.note-stack article, .context-grid article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 18px;
}
.device-track.detailed { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.steps-strip, .renewal-strip {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}
.steps-strip ol, .renewal-strip ul { margin: 0; padding-left: 24px; }
.context-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}
.issue-basket {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.issue-basket a {
  padding: 10px 13px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--orange-dark);
  font-weight: 800;
}
.support-strip {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  background: var(--ink);
  color: #fff;
  border-radius: 8px;
  margin-top: 22px;
}
.support-strip p { margin: 0; }
.text-spread.narrow, .contact-board.narrow, .article-shell {
  max-width: 900px;
}
.split-notes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 22px 0;
}
.split-notes div {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  background: #fff;
}
.contact-board {
  display: grid;
  gap: 22px;
}
.mail-line a { color: var(--orange-dark); font-weight: 900; }
.message-form {
  display: grid;
  gap: 12px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
}
.message-form label { display: grid; gap: 7px; font-weight: 800; }
.message-form input, .message-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  font: inherit;
}
.message-form button {
  justify-self: start;
  border: 1px solid var(--orange);
  background: var(--orange);
  color: #fff;
  border-radius: 8px;
  padding: 10px 16px;
  font-weight: 900;
}
.soft-note { color: var(--muted); }
.article-shell {
  margin: 0 auto;
  padding: clamp(42px, 6vw, 78px) clamp(18px, 4vw, 52px);
}
.article-shell time {
  display: inline-block;
  margin: 18px 0 0;
  color: var(--orange-dark);
  font-weight: 800;
}
.article-summary {
  font-size: 20px;
  color: var(--muted);
  border-left: 4px solid var(--orange);
  padding-left: 16px;
}
.article-shell section { margin-top: 34px; }
.article-shell h2 { font-size: 28px; margin-bottom: 10px; }
.article-shell p { color: #4f443b; }
.article-next {
  margin-top: 38px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.article-next a {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--orange-dark);
  font-weight: 800;
}
.site-foot {
  display: grid;
  grid-template-columns: 1.3fr repeat(3, minmax(0, .8fr));
  gap: 24px;
  padding: 44px clamp(18px, 4vw, 52px);
  background: #201a16;
  color: #fff7e8;
}
.site-foot p, .site-foot a, .foot-mail { color: #f0d7b4; }
.foot-mail { display: inline-block; font-size: 14px; }
.site-foot h2 {
  margin: 0 0 12px;
  font-size: 15px;
  color: #fff;
}
.site-foot nav { display: grid; gap: 7px; align-content: start; }
.site-foot a:hover { color: #fff; }
@media (max-width: 900px) {
  .site-head { align-items: flex-start; }
  .menu-toggle { display: inline-flex; }
  .site-nav {
    display: none;
    position: absolute;
    top: 60px;
    left: 18px;
    right: 18px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 10px;
    box-shadow: var(--shadow);
  }
  .site-nav.is-open { display: grid; }
  .site-nav a { padding: 11px; }
  .brand-mark em { display: none; }
  .citrus-cover { grid-template-columns: 1fr; padding-top: 34px; }
  .cover-copy h1, .page-cover h1, .article-shell h1 { font-size: clamp(34px, 12vw, 48px); }
  .device-track, .device-track.detailed, .plan-columns, .plan-columns.full, .article-ledger, .article-ledger.wide, .faq-grid, .split-panel, .context-grid, .split-notes, .site-foot {
    grid-template-columns: 1fr;
  }
  .scenario-row, .latency-row { grid-template-columns: 1fr; gap: 7px; }
  .section-head { display: block; }
  .section-head .line-link { margin-top: 12px; }
  .support-strip { align-items: flex-start; flex-direction: column; }
}
@media (max-width: 460px) {
  .site-head { padding-inline: 14px; }
  .brand-mark strong { max-width: 150px; overflow: hidden; text-overflow: ellipsis; }
  .cover-actions { display: grid; }
  .primary-action, .secondary-action { width: 100%; }
  .peel-rail, .smart-band, .platform-orchard, .guide-spread, .faq-strip, .page-cover, .split-panel, .device-track.detailed, .steps-strip, .context-grid, .latency-table, .plan-columns.full, .renewal-strip, .issue-basket, .article-ledger.wide, .support-strip, .text-spread, .contact-board, .article-shell {
    padding-inline: 16px;
  }
}