@import url('https://fonts.googleapis.com/css2?family=Nunito+Sans:wght@300;400;500;600;700&family=Varela+Round&display=swap');

:root {
  --navy: #1B1F3B;
  --orange: #FF7A45;
  --cream: #FFF6EC;
  --line: rgba(27, 31, 59, 0.22);
  --soft: rgba(27, 31, 59, 0.06);
  --pad: clamp(16px, 4vw, 44px);
  --head: "Varela Round", "Nunito Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  --body: "Nunito Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--cream);
  color: var(--navy);
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.78;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--head);
  font-weight: 400;
  line-height: 1.22;
}

a {
  color: inherit;
}

/* ---------- 顶部 ---------- */
.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px var(--pad);
  border-bottom: 1.5px solid var(--line);
  background: var(--cream);
  position: relative;
  z-index: 30;
}

.brand {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-family: var(--head);
  font-size: 22px;
  letter-spacing: 0.08em;
  color: var(--navy);
  text-decoration: none;
}

.brand::before {
  content: "";
  width: 11px;
  height: 11px;
  margin-right: 9px;
  border-radius: 50%;
  background: var(--orange);
  flex: 0 0 auto;
}

.menu {
  margin-left: auto;
  position: relative;
}

.menu summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 9px 20px;
  border: 1.5px solid var(--navy);
  border-radius: 999px;
  background: var(--navy);
  color: var(--cream);
  font-size: 16px;
  user-select: none;
}

.menu summary::-webkit-details-marker {
  display: none;
}

.menu[open] summary {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--navy);
}

.menu menu {
  position: absolute;
  right: 0;
  top: calc(100% + 10px);
  margin: 0;
  padding: 8px;
  list-style: none;
  min-width: min(270px, 84vw);
  display: grid;
  gap: 2px;
  background: var(--cream);
  border: 1.5px solid var(--navy);
  border-radius: 10px;
  z-index: 40;
}

.menu menu li a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 16px;
  text-decoration: none;
  color: var(--navy);
}

.menu menu li a:hover,
.menu menu li a:focus-visible {
  background: rgba(255, 122, 69, 0.22);
}

.talk {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 9px 20px;
  border: 1.5px solid var(--orange);
  border-radius: 999px;
  color: var(--navy);
  text-decoration: none;
  font-size: 16px;
  white-space: nowrap;
}

.talk:hover {
  background: var(--orange);
}

/* ---------- 粘性锚点条 ---------- */
.rail {
  position: sticky;
  top: 0;
  z-index: 25;
  background: rgba(255, 246, 236, 0.95);
  border-bottom: 1.5px solid var(--line);
}

.rail-in {
  display: flex;
  gap: 8px;
  padding: 10px var(--pad);
  overflow-x: auto;
  scrollbar-width: thin;
}

.pill {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 7px 16px;
  border: 1.5px solid var(--line);
  border-radius: 999px;
  text-decoration: none;
  font-size: 16px;
  white-space: nowrap;
  color: var(--navy);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.pill:hover,
.pill.on {
  background: var(--navy);
  border-color: var(--navy);
  color: var(--cream);
}

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  align-items: end;
  padding: calc(var(--pad) + 18px) var(--pad) 9vh;
  background: var(--navy);
  color: var(--cream);
  overflow: hidden;
  isolation: isolate;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(255, 246, 236, 0.16) 1.2px, transparent 1.3px);
  background-size: 22px 22px;
  z-index: -1;
}

.hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -34%;
  width: 70vw;
  height: 70vw;
  max-width: 700px;
  max-height: 700px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 122, 69, 0.4), transparent 64%);
  z-index: -1;
}

.hero-in {
  position: relative;
  width: 100%;
  max-width: 1080px;
  margin-left: auto;
  text-align: right;
}

.kicker {
  margin: 0 0 14px;
  font-size: 16px;
  letter-spacing: 0.34em;
  color: var(--orange);
}

.hero-h1 {
  margin: 0 0 20px;
  font-size: clamp(2.1rem, 10vw, 7rem);
  line-height: 1.02;
  letter-spacing: 0.01em;
  word-break: break-word;
  background: linear-gradient(102deg, #FFF6EC 26%, #FF7A45 96%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-h1 .ch {
  display: inline-block;
  opacity: 0;
  transform: translateY(0.55em) rotate(3deg);
  animation: chIn 0.74s cubic-bezier(0.2, 0.72, 0.2, 1) forwards;
  animation-delay: calc(var(--i) * 34ms + 110ms);
}

@keyframes chIn {
  to {
    opacity: 1;
    transform: none;
  }
}

.hero-lead {
  max-width: 46ch;
  margin: 0 0 26px auto;
  font-size: 17px;
  color: rgba(255, 246, 236, 0.86);
}

.hero-act {
  margin: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 11px 26px;
  border-radius: 999px;
  background: var(--orange);
  color: var(--navy);
  border: 1.5px solid var(--orange);
  text-decoration: none;
  font-size: 16px;
  font-weight: 600;
}

.btn:hover {
  background: transparent;
  color: var(--orange);
}

/* ---------- 内容区 ---------- */
.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--pad);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.side {
  padding: 26px 0 4px;
  text-align: right;
  border-bottom: 1.5px solid var(--line);
}

.side small {
  display: block;
  font-size: 16px;
  letter-spacing: 0.28em;
  color: var(--orange);
  margin-bottom: 4px;
}

.side-h {
  margin: 0 0 12px;
  font-size: 20px;
}

.side-list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: grid;
  gap: 2px;
}

.side-list a {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  min-height: 40px;
  padding: 5px 10px;
  border-radius: 8px;
  text-decoration: none;
  font-size: 16px;
}

.side-list a:hover {
  background: rgba(255, 122, 69, 0.2);
}

.num {
  font-family: var(--head);
  font-size: 16px;
  color: var(--orange);
  opacity: 0.85;
}

.doc {
  padding: 8px 0 64px;
  text-align: right;
  max-width: 74ch;
}

.doc article {
  padding: clamp(26px, 4.4vw, 48px) 0;
  border-bottom: 1.5px dashed var(--line);
  scroll-margin-top: 108px;
}

.doc article:last-child {
  border-bottom: 0;
}

.doc small {
  display: block;
  font-size: 16px;
  letter-spacing: 0.26em;
  color: var(--orange);
  margin-bottom: 6px;
}

.doc h2 {
  margin: 0 0 16px;
  font-size: clamp(1.5rem, 3.6vw, 2.15rem);
}

.doc h3 {
  margin: 26px 0 10px;
  font-size: 1.16rem;
}

.doc p {
  margin: 0 0 16px;
}

.doc ul,
.doc ol {
  margin: 0 0 16px;
  padding: 0 1.15em 0 0;
  list-style-position: inside;
}

.doc li {
  margin-bottom: 8px;
}

.doc a {
  color: var(--navy);
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.doc strong {
  background: rgba(255, 122, 69, 0.24);
  padding: 0 3px;
}

.doc blockquote {
  margin: 0 0 16px;
  padding: 6px 18px 6px 0;
  border-right: 3px solid var(--orange);
  color: rgba(27, 31, 59, 0.82);
}

.doc img {
  max-width: 100%;
  height: auto;
  border: 1.5px solid var(--line);
  border-radius: 10px;
}

.doc table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 16px;
  font-size: 16px;
}

.doc th,
.doc td {
  border: 1.5px solid var(--line);
  padding: 8px 10px;
  text-align: right;
}

.doc code {
  font-size: 15px;
  background: var(--soft);
  border-radius: 6px;
  padding: 1px 5px;
}

.doc pre {
  overflow-x: auto;
  border: 1.5px solid var(--line);
  border-radius: 10px;
  padding: 12px;
  text-align: left;
  direction: ltr;
}

/* ---------- 页脚 ---------- */
.foot {
  background: var(--navy);
  color: var(--cream);
  padding: clamp(30px, 5vw, 58px) var(--pad) 18px;
  text-align: left;
}

.foot-grid {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  gap: 26px;
  grid-template-columns: minmax(0, 1fr);
}

.foot small {
  display: block;
  font-size: 16px;
  letter-spacing: 0.26em;
  color: var(--orange);
  margin-bottom: 4px;
}

.foot h2 {
  margin: 0 0 10px;
  font-size: 18px;
  color: var(--cream);
}

.fmark {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-family: var(--head);
  font-size: 22px;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.fmark::before {
  content: "";
  width: 11px;
  height: 11px;
  margin-right: 9px;
  border-radius: 50%;
  background: var(--orange);
}

.fcol ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.fcol ul a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 2px 0;
  font-size: 16px;
  text-decoration: none;
  color: var(--cream);
}

.fcol ul a:hover {
  color: var(--orange);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.fcol-talk address {
  font-style: normal;
  line-height: 1.7;
  margin-bottom: 12px;
}

.fname {
  font-family: var(--head);
  letter-spacing: 0.06em;
}

.fcol-talk code {
  display: inline-block;
  margin-top: 4px;
  font-size: 15px;
  color: var(--orange);
  border: 1.5px solid rgba(255, 122, 69, 0.5);
  border-radius: 10px;
  padding: 0 8px;
}

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

.sub input {
  flex: 1 1 150px;
  min-height: 44px;
  padding: 8px 14px;
  border: 1.5px solid rgba(255, 246, 236, 0.42);
  border-radius: 10px;
  background: transparent;
  color: var(--cream);
  font-family: var(--body);
  font-size: 16px;
}

.sub input::placeholder {
  color: rgba(255, 246, 236, 0.62);
}

.sub button {
  min-height: 44px;
  padding: 8px 22px;
  border: 1.5px solid var(--orange);
  border-radius: 999px;
  background: var(--orange);
  color: var(--navy);
  font-family: var(--body);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
}

.sub button:hover {
  background: transparent;
  color: var(--orange);
}

.foot-base {
  max-width: 1180px;
  margin: 26px auto 0;
  padding-top: 14px;
  border-top: 1.5px solid rgba(255, 246, 236, 0.24);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  align-items: center;
  justify-content: space-between;
}

.copy {
  margin: 0;
  font-size: 16px;
  color: rgba(255, 246, 236, 0.78);
}

.flinks {
  display: flex;
  gap: 18px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.flinks a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-size: 16px;
  text-decoration: none;
  color: var(--cream);
}

.flinks a:hover {
  color: var(--orange);
}

/* ---------- 滚动揭示 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.66s ease, transform 0.66s cubic-bezier(0.2, 0.72, 0.2, 1);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .foot-grid {
    grid-template-columns: 1.1fr 1fr 1fr 1.4fr;
    gap: 32px;
  }
}

@media (min-width: 960px) {
  .wrap {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .side {
    position: sticky;
    top: 74px;
    padding-top: 54px;
    border-bottom: 0;
  }

  .doc {
    padding-top: 40px;
    margin-left: auto;
  }
}

@media (max-width: 420px) {
  .talk {
    padding: 9px 14px;
  }

  .menu summary {
    padding: 9px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero-h1 .ch {
    animation: none;
    opacity: 1;
    transform: none;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

button[aria-expanded]{min-width:44px;min-height:44px}