:root {
  --paper: #f5f7f2;
  --surface: #ffffff;
  --ink: #18201c;
  --muted: #65716a;
  --line: #dce4db;
  --theme: #2f6f63;
  --theme-dark: #18483f;
  --theme-soft: rgba(47, 111, 99, .12);
  --green: #28624a;
  --green-dark: #173f31;
  --coral: #c7493a;
  --amber: #e8b84b;
  --blue: #2f557f;
  --shadow: 0 18px 46px rgba(24, 32, 28, .12);
  --shadow-hover: 0 26px 62px rgba(24, 32, 28, .18);
  --ease: cubic-bezier(.2, .8, .2, 1);
  --max: 1220px;
  --rail: 292px;
  --radius: 8px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(47, 111, 99, .08) 0 1px, transparent 1px 100%),
    linear-gradient(180deg, rgba(47, 111, 99, .06) 0 1px, transparent 1px 100%),
    var(--paper);
  background-size: 28px 28px;
  font-family: "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.75;
}

body.menu-open { overflow: hidden; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
p { margin: 0 0 1rem; }
h1, h2, h3 { margin: 0; line-height: 1.2; letter-spacing: 0; }
h1 {
  font-size: clamp(1.9rem, 4.4vw, 4.55rem);
  max-width: 900px;
  color: var(--theme-dark);
}
h2 {
  font-size: clamp(1.25rem, 2.25vw, 2.05rem);
  color: var(--theme-dark);
}
h3 { font-size: 1.08rem; }
strong { font-weight: 900; }

::selection {
  color: #fff;
  background: var(--theme);
}

.skip-link {
  position: fixed;
  top: -4rem;
  left: 1rem;
  z-index: 1000;
  padding: .7rem 1rem;
  color: #fff;
  background: var(--theme-dark);
  border-radius: var(--radius);
}
.skip-link:focus { top: 1rem; }

.mobile-menu {
  display: none;
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 250;
  align-items: center;
  gap: .42rem;
  min-height: 44px;
  padding: .65rem .85rem;
  border: 1px solid rgba(255, 255, 255, .28);
  border-radius: 999px;
  color: #fff;
  background: var(--theme-dark);
  box-shadow: 0 12px 30px rgba(24, 32, 28, .2);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), background .2s var(--ease);
}
.mobile-menu span {
  display: block;
  width: 14px;
  height: 2px;
  background: currentColor;
}
.mobile-menu b { font-size: .9rem; }
.mobile-menu:hover,
.mobile-menu:focus-visible {
  background: #0f332c;
  outline: 3px solid rgba(47, 111, 99, .18);
  transform: translateY(-2px);
  box-shadow: 0 18px 38px rgba(24, 32, 28, .26);
}

.page-shell {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  width: min(100%, 1580px);
  margin: 0 auto;
}

.site-rail {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 2rem 1.3rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  color: #f8fff8;
  background: linear-gradient(180deg, var(--theme-dark), #16352f);
  border-right: 1px solid rgba(255, 255, 255, .14);
}
.rail-brand {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: .8rem;
  align-items: center;
  transition: transform .22s var(--ease);
}
.rail-brand:hover { transform: translateX(3px); }
.rail-brand img {
  width: 58px;
  height: 58px;
  object-fit: cover;
  border-radius: 50%;
  border: 2px solid var(--amber);
  transition: transform .24s var(--ease), box-shadow .24s var(--ease);
}
.rail-brand:hover img {
  transform: rotate(-3deg) scale(1.04);
  box-shadow: 0 0 0 6px rgba(232, 184, 75, .12);
}
.rail-brand strong,
.rail-brand small {
  display: block;
  overflow-wrap: anywhere;
}
.rail-brand strong {
  font-size: 1.05rem;
  color: #fff;
}
.rail-brand small {
  margin-top: .15rem;
  color: rgba(248, 255, 248, .72);
  font-size: .82rem;
  line-height: 1.35;
}

.rail-nav {
  display: grid;
  gap: .35rem;
}
.rail-nav a {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: .58rem .78rem;
  border-left: 3px solid transparent;
  border-radius: 0 var(--radius) var(--radius) 0;
  color: rgba(248, 255, 248, .78);
  font-weight: 800;
  transition: background .22s var(--ease), color .22s var(--ease), border-color .22s var(--ease), transform .22s var(--ease);
}
.rail-nav a::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(232, 184, 75, .18), transparent 72%);
  opacity: 0;
  transform: translateX(-18px);
  transition: opacity .22s var(--ease), transform .22s var(--ease);
}
.rail-nav a:hover,
.rail-nav a:focus-visible,
.rail-nav a[aria-current="true"] {
  color: #fff;
  background: rgba(255, 255, 255, .1);
  border-color: var(--amber);
  outline: none;
  transform: translateX(4px);
}
.rail-nav a:hover::after,
.rail-nav a:focus-visible::after,
.rail-nav a[aria-current="true"]::after {
  opacity: 1;
  transform: translateX(0);
}

.rail-action {
  margin-top: auto;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, .18);
}
.rail-action p {
  color: rgba(248, 255, 248, .72);
  font-size: .9rem;
}
.download-link,
.primary-button,
.ghost-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border-radius: var(--radius);
  font-weight: 900;
}
.download-link {
  width: 100%;
  color: #173f31;
  background: linear-gradient(135deg, var(--amber), #f3cf74);
  box-shadow: 0 12px 24px rgba(232, 184, 75, .18);
  transition: transform .22s var(--ease), box-shadow .22s var(--ease), filter .22s var(--ease);
}
.download-link:hover,
.download-link:focus-visible {
  outline: none;
  transform: translateY(-2px);
  filter: saturate(1.08);
  box-shadow: 0 18px 34px rgba(232, 184, 75, .28);
}

.content {
  min-width: 0;
  padding: 2rem clamp(1rem, 4vw, 3rem) 3rem;
}

.lead-panel {
  min-height: 72vh;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 42%);
  align-items: center;
  gap: clamp(1.4rem, 4vw, 3.5rem);
  width: min(var(--max), 100%);
  margin: 0 auto;
  padding: 2rem 0 2.4rem;
}
.label {
  margin: 0 0 .75rem;
  color: var(--theme);
  font-size: .8rem;
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.lead-text {
  max-width: 760px;
  color: #3c4740;
  font-size: clamp(1.02rem, 1.6vw, 1.18rem);
}
.lead-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.4rem;
}
.primary-button {
  position: relative;
  overflow: hidden;
  padding: .72rem 1.05rem;
  color: #fff;
  background: linear-gradient(135deg, var(--theme), #3e8a78);
  box-shadow: 0 12px 26px rgba(47, 111, 99, .18);
  transition: transform .22s var(--ease), box-shadow .22s var(--ease), background .22s var(--ease), outline-color .22s var(--ease);
}
.primary-button::after {
  content: "";
  position: absolute;
  inset: -80% auto -80% -45%;
  width: 42%;
  transform: rotate(18deg);
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .38), transparent);
  transition: left .45s var(--ease);
}
.primary-button:hover,
.primary-button:focus-visible {
  background: linear-gradient(135deg, #27685b, #1f5a4f);
  outline: 3px solid rgba(47, 111, 99, .16);
  transform: translateY(-2px);
  box-shadow: 0 18px 34px rgba(47, 111, 99, .28);
}
.primary-button:hover::after,
.primary-button:focus-visible::after {
  left: 108%;
}
.ghost-button {
  padding: .72rem 1.05rem;
  color: var(--theme-dark);
  background: var(--theme-soft);
  border: 1px solid rgba(47, 111, 99, .22);
  transition: transform .22s var(--ease), background .22s var(--ease), border-color .22s var(--ease), box-shadow .22s var(--ease);
}
.ghost-button:hover,
.ghost-button:focus-visible {
  background: rgba(47, 111, 99, .16);
  outline: 3px solid rgba(47, 111, 99, .12);
  border-color: rgba(47, 111, 99, .4);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(47, 111, 99, .12);
}
.lead-visual {
  margin: 0;
  align-self: stretch;
  min-height: 460px;
  overflow: hidden;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  background: var(--green-dark);
  transition: transform .35s var(--ease), box-shadow .35s var(--ease);
}
.lead-visual:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.lead-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .55s var(--ease), filter .35s var(--ease);
}
.lead-visual:hover img {
  transform: scale(1.035);
  filter: saturate(1.08) contrast(1.03);
}

.status-strip {
  width: min(var(--max), 100%);
  margin: 0 auto 4rem;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: 0 10px 30px rgba(24, 32, 28, .06);
}
.status-strip div {
  position: relative;
  min-height: 92px;
  padding: 1rem;
  border-right: 1px solid var(--line);
  transition: background .22s var(--ease), transform .22s var(--ease);
}
.status-strip div::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 3px;
  background: linear-gradient(90deg, var(--theme), var(--amber));
  opacity: 0;
  transition: opacity .22s var(--ease);
}
.status-strip div:hover {
  background: linear-gradient(180deg, rgba(47, 111, 99, .08), #fff);
  transform: translateY(-2px);
}
.status-strip div:hover::before { opacity: 1; }
.status-strip div:last-child { border-right: 0; }
.status-strip span {
  display: block;
  color: var(--muted);
  font-size: .82rem;
  font-weight: 800;
}
.status-strip strong {
  display: block;
  margin-top: .25rem;
  color: var(--theme-dark);
  font-size: clamp(.95rem, 1.4vw, 1.14rem);
}

.chapter,
.media-section,
.final-cta,
.friend-links {
  width: min(var(--max), 100%);
  margin: 0 auto 4.2rem;
}
.chapter-head {
  display: grid;
  grid-template-columns: minmax(180px, .36fr) minmax(0, 1fr);
  align-items: end;
  gap: 1rem;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--ink);
}
.chapter-head .label { margin-bottom: .15rem; }

.article-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 1.3rem;
}
.article-main,
.note-panel,
.system-list article,
.route-step,
.update-list article,
.faq-list details {
  position: relative;
  background: rgba(255, 255, 255, .86);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 10px 26px rgba(24, 32, 28, .05);
  transition: transform .24s var(--ease), box-shadow .24s var(--ease), border-color .24s var(--ease), background .24s var(--ease);
}
.article-main:hover,
.note-panel:hover,
.system-list article:hover,
.route-step:hover,
.update-list article:hover,
.faq-list details:hover {
  background: rgba(255, 255, 255, .96);
  border-color: rgba(47, 111, 99, .28);
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}
.article-main {
  padding: clamp(1.2rem, 3vw, 2rem);
  font-size: 1.04rem;
}
.article-main h3,
.note-panel h3,
.system-list h3,
.route-step h3,
.update-list h3 { margin-bottom: .55rem; }
.note-panel {
  padding: 1.25rem;
}
.note-panel ol,
.route-step p,
.system-list p,
.update-list p,
.faq-list p {
  margin-bottom: 0;
}
.note-panel li + li { margin-top: .55rem; }

.system-list {
  display: grid;
  gap: .85rem;
}
.system-list article {
  overflow: hidden;
  display: grid;
  grid-template-columns: 84px minmax(160px, .34fr) minmax(0, 1fr);
  align-items: center;
  gap: 1rem;
  padding: 1.05rem 1.2rem;
}
.system-list article::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: linear-gradient(180deg, var(--theme), var(--amber));
  opacity: 0;
  transition: opacity .24s var(--ease);
}
.system-list article:hover::before { opacity: 1; }
.system-list span {
  color: var(--blue);
  font-size: 2rem;
  font-weight: 900;
  line-height: 1;
  transition: color .24s var(--ease), transform .24s var(--ease);
}
.system-list article:hover span {
  color: var(--theme);
  transform: scale(1.08);
}

.route-board {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .85rem;
}
.route-step {
  position: relative;
  overflow: hidden;
  padding: 1.15rem;
  min-height: 230px;
  border-top: 4px solid var(--theme);
}
.route-step::before {
  content: "";
  position: absolute;
  right: -36px;
  top: -36px;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: rgba(47, 111, 99, .09);
  transform: scale(.7);
  opacity: 0;
  transition: opacity .28s var(--ease), transform .28s var(--ease);
}
.route-step:hover::before {
  opacity: 1;
  transform: scale(1);
}
.route-step b {
  display: inline-flex;
  margin-bottom: .8rem;
  color: var(--coral);
  font-size: .82rem;
  letter-spacing: .05em;
  text-transform: uppercase;
}

.media-layout {
  display: grid;
  grid-template-columns: minmax(0, .95fr) minmax(300px, .8fr);
  gap: 1rem;
}
.media-layout figure {
  margin: 0;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 10px 26px rgba(24, 32, 28, .06);
  transition: transform .28s var(--ease), box-shadow .28s var(--ease), border-color .28s var(--ease);
}
.media-layout figure:hover {
  transform: translateY(-4px);
  border-color: rgba(47, 111, 99, .3);
  box-shadow: var(--shadow-hover);
}
.media-layout img {
  width: 100%;
  object-fit: cover;
  transition: transform .55s var(--ease), filter .3s var(--ease);
}
.media-layout figure:hover img {
  transform: scale(1.04);
  filter: saturate(1.08);
}
.large-shot img { aspect-ratio: 4 / 5; }
.small-shots {
  display: grid;
  gap: 1rem;
}
.small-shots img { aspect-ratio: 16 / 9; }
figcaption {
  padding: .75rem .9rem;
  color: var(--muted);
  font-size: .9rem;
  font-weight: 800;
  transition: color .22s var(--ease), background .22s var(--ease);
}
.media-layout figure:hover figcaption {
  color: var(--theme-dark);
  background: rgba(47, 111, 99, .06);
}

.update-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .9rem;
}
.update-list article {
  padding: 1.1rem;
  overflow: hidden;
}
.update-list article::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at top right, rgba(232, 184, 75, .2), transparent 38%);
  opacity: 0;
  transition: opacity .24s var(--ease);
}
.update-list article:hover::before {
  opacity: 1;
}
.update-list time {
  display: inline-flex;
  margin-bottom: .7rem;
  color: var(--blue);
  font-weight: 900;
}

.faq-list {
  display: grid;
  gap: .75rem;
}
.faq-list details {
  padding: 0;
  overflow: hidden;
}
.faq-list summary {
  position: relative;
  list-style: none;
  cursor: pointer;
  padding: 1rem 1.1rem;
  color: var(--theme-dark);
  font-weight: 900;
  transition: background .22s var(--ease), color .22s var(--ease), padding-left .22s var(--ease);
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--theme);
  font-size: 1.25rem;
  line-height: 1;
  transition: transform .22s var(--ease), color .22s var(--ease);
}
.faq-list details[open] summary::after {
  content: "-";
  color: var(--coral);
}
.faq-list summary:hover,
.faq-list summary:focus-visible {
  background: rgba(47, 111, 99, .07);
  outline: none;
  padding-left: 1.3rem;
}
.faq-list p {
  padding: 0 1.1rem 1rem;
  color: #3c4740;
}

.final-cta {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem;
  color: #fff;
  background: linear-gradient(135deg, var(--theme-dark), #12332d);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform .28s var(--ease), box-shadow .28s var(--ease);
}
.final-cta::before {
  content: "";
  position: absolute;
  inset: -40% -10% auto auto;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: rgba(232, 184, 75, .16);
  pointer-events: none;
}
.final-cta:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}
.final-cta > * {
  position: relative;
  z-index: 1;
}
.final-cta .label { color: var(--amber); }
.final-cta h2 {
  color: #fff8dc;
  text-shadow: 0 2px 12px rgba(0, 0, 0, .28);
}
.final-cta p {
  color: rgba(255, 255, 255, .9);
  text-shadow: 0 1px 8px rgba(0, 0, 0, .18);
}
.final-cta .primary-button {
  color: var(--green-dark);
  background: linear-gradient(135deg, var(--amber), #f3cf74);
  box-shadow: none;
}

.friend-links {
  position: relative;
  overflow: hidden;
  margin-bottom: 2.2rem;
  padding: clamp(1.8rem, 4vw, 2.8rem) 1.2rem;
  text-align: center;
  color: #fff8dc;
  background:
    radial-gradient(circle at 50% 20%, rgba(255, 248, 220, .16), transparent 34%),
    linear-gradient(135deg, var(--theme-dark), var(--theme));
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.friend-links::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .08), transparent);
  opacity: .65;
}
.friend-links h2 {
  position: relative;
  z-index: 1;
  margin-bottom: 1rem;
  color: #ffe9a3;
  font-size: clamp(1.45rem, 3vw, 2.2rem);
  text-shadow: 0 2px 14px rgba(0, 0, 0, .24);
}
.friend-link-list {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .75rem;
}
.friend-link-list a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: .58rem 1.15rem;
  color: var(--theme-dark);
  background: #fff7e8;
  border: 1px solid rgba(255, 255, 255, .65);
  border-radius: 999px;
  font-weight: 900;
  box-shadow: 0 12px 28px rgba(0, 0, 0, .14);
  transition: transform .22s var(--ease), box-shadow .22s var(--ease), background .22s var(--ease), color .22s var(--ease);
}
.friend-link-list a:hover,
.friend-link-list a:focus-visible {
  color: #102f29;
  background: linear-gradient(135deg, #fff8dc, var(--amber));
  outline: 3px solid rgba(255, 248, 220, .22);
  transform: translateY(-3px);
  box-shadow: 0 18px 38px rgba(0, 0, 0, .2);
}

.site-footer {
  width: min(var(--max), 100%);
  margin: 0 auto;
  padding-top: 1.25rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .92rem;
}
.site-footer a {
  color: var(--green-dark);
  font-weight: 900;
  transition: color .2s var(--ease);
}
.site-footer a:hover,
.site-footer a:focus-visible {
  color: var(--coral);
  outline: none;
}

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .5s ease, transform .5s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media (max-width: 1120px) {
  .page-shell { grid-template-columns: 1fr; }
  .mobile-menu { display: inline-flex; }
  .site-rail {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 220;
    width: min(84vw, 320px);
    transform: translateX(-105%);
    transition: transform .24s ease;
    box-shadow: 26px 0 50px rgba(24, 32, 28, .24);
  }
  .site-rail.is-open { transform: translateX(0); }
  .content { padding-bottom: 5.5rem; }
}

@media (max-width: 900px) {
  .lead-panel,
  .article-grid,
  .media-layout,
  .final-cta {
    grid-template-columns: 1fr;
  }
  .lead-panel { min-height: 0; }
  .lead-visual { min-height: 320px; }
  .status-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .status-strip div:nth-child(2) { border-right: 0; }
  .status-strip div:nth-child(-n + 2) { border-bottom: 1px solid var(--line); }
  .chapter-head { grid-template-columns: 1fr; }
  .system-list article { grid-template-columns: 64px minmax(0, 1fr); }
  .system-list article p { grid-column: 2; }
  .route-board,
  .update-list { grid-template-columns: 1fr; }
  .route-step { min-height: 0; }
}

@media (max-width: 560px) {
  .content { padding-inline: .85rem; }
  .lead-panel { padding-top: 1rem; }
  .lead-visual { min-height: 240px; }
  .status-strip { grid-template-columns: 1fr; }
  .status-strip div {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .status-strip div:last-child { border-bottom: 0; }
  .system-list article {
    grid-template-columns: 1fr;
    gap: .45rem;
  }
  .system-list article p { grid-column: auto; }
  .site-footer { flex-direction: column; }
}