/* 组件。依据：设计方案第八、九节 */

/* ---------- 页头 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--c-paper);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.site-header.is-scrolled {
  border-bottom-color: var(--c-line);
  box-shadow: 0 4px 16px rgba(22, 33, 27, .045);
}
.site-header__inner {
  display: flex; align-items: center; gap: 32px;
  height: var(--header-h); transition: height var(--t-fast);
}
.site-header.is-scrolled .site-header__inner { height: var(--header-h-compact); }

.brand { display: flex; align-items: center; gap: 10px; color: var(--c-ink); flex-shrink: 0; }
.brand:hover { color: var(--c-ink); }
/* 临时标志为白底 jpg 裁切，用正片叠底融入浅色底；新版透明 PNG 到位后可去掉 */
.brand__mark { width: 44px; height: auto; mix-blend-mode: multiply; }
.brand__name { font-family: var(--f-serif); font-size: 22px; font-weight: 600; letter-spacing: .08em; color: var(--c-green-dk); }

.nav { margin-left: auto; }
.nav__list { display: flex; gap: clamp(20px, 2.2vw, 36px); }
.nav__link { color: var(--c-ink); font-size: 16px; padding: 6px 0; border-bottom: 1px solid transparent; }
.nav__link:hover { color: var(--c-green); }
.nav__link[aria-current="page"] { color: var(--c-green-dk); border-bottom-color: var(--c-gold); }

.site-header__actions { display: flex; align-items: center; gap: 20px; }
.site-header__actions .link-quiet { font-size: 15px; }

.nav-toggle {
  display: none; margin-left: auto; width: 44px; height: 44px; padding: 0;
  background: none; border: 0; cursor: pointer; color: var(--c-ink);
}
.nav-toggle__bar { display: block; width: 22px; height: 1.5px; margin: 5px auto; background: currentColor; transition: transform var(--t-fast), opacity var(--t-fast); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

@media (max-width: 991px) {
  .nav-toggle { display: block; }
  .site-header__actions { display: none; }
  .nav {
    position: absolute; left: 0; right: 0; top: 100%;
    background: var(--c-paper); border-bottom: 1px solid var(--c-line);
    display: none;
  }
  .nav.is-open { display: block; }
  .nav__list { flex-direction: column; gap: 0; padding: 8px var(--gutter) 20px; }
  .nav__link { display: block; padding: 14px 0; border-bottom: 1px solid var(--c-line); }
  .nav__link[aria-current="page"] { border-bottom-color: var(--c-line); color: var(--c-green); }
}

/* ---------- 按钮与链接 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 52px; padding: 0 32px;
  font: 500 16px/1 var(--f-sans); letter-spacing: .04em;
  border: 1px solid transparent; border-radius: var(--radius);
  cursor: pointer; transition: background-color var(--t-fast), color var(--t-fast), border-color var(--t-fast);
}
.btn--primary { background: var(--c-green-dk); color: var(--c-cream); }
.btn--primary:hover { background: var(--c-green); color: var(--c-cream); }
.btn--secondary { border-color: var(--c-green-dk); color: var(--c-green-dk); background: transparent; }
.btn--secondary:hover { background: var(--c-green-dk); color: var(--c-cream); }
.btn--inverse { background: var(--c-cream); color: var(--c-green-dk); }
.btn--inverse:hover { background: #fff; color: var(--c-green-dk); }
.btn--sm { min-height: 40px; padding: 0 20px; font-size: 14px; }

.link {
  color: var(--c-green-dk); font-weight: 500;
  text-decoration: underline; text-decoration-color: var(--c-gold);
  text-underline-offset: 6px; text-decoration-thickness: 1px;
}
.link:hover { color: var(--c-green); text-decoration-color: var(--c-green); }
.link-quiet { color: var(--c-ink); }
.link-quiet:hover { color: var(--c-green); }
.section--dark .link { color: var(--c-cream); text-decoration-color: var(--c-gold-lt); }

/* ---------- 区块标题：H2 + 金色细线圆点 + 导语 ---------- */
.section-head { margin-bottom: var(--sp-block); max-width: 720px; }
.section-head h2 { margin-bottom: 20px; }
.section-head__rule { display: none; align-items: center; width: 72px; margin-bottom: 20px; }
.section-head--ruled .section-head__rule { display: flex; }
.section-head__rule::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--c-gold); flex-shrink: 0; }
.section-head__rule::after { content: ""; flex: 1; height: 1px; background: var(--c-gold); }
.section-head p { font-size: 18px; color: var(--c-stone); }
.section--dark .section-head p { color: rgba(246, 243, 236, .78); }

/* ---------- 卡片 ---------- */
.card {
  display: flex; flex-direction: column; height: 100%;
  background: var(--c-paper); border: 1px solid var(--c-line); border-radius: var(--radius);
  color: inherit; overflow: hidden; transition: border-color var(--t-fast);
}
.section--cream .card { background: var(--c-paper); }
a.card:hover { border-color: var(--c-green); color: inherit; }
.card__media { aspect-ratio: 16 / 9; overflow: hidden; }
.card__media > * { width: 100%; height: 100%; object-fit: cover; }
.card__body { padding: 24px 28px 28px; }
.card__body h3 { margin-bottom: 8px; }
.card__body p { font-size: 16px; }

/* ---------- 步骤（只用于真实顺序内容） ---------- */
.steps { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 24px; position: relative; }
.steps::before {
  /* 从第一个圆心连到最后一个圆心：右端扣掉一列宽度再加回半个圆 */
  content: ""; position: absolute; left: 24px; right: calc((100% - 96px) / 5 - 24px); top: 24px;
  height: 1px; background: var(--c-line);
}
.step { position: relative; }
.step__num {
  position: relative; display: flex; align-items: center; justify-content: center;
  width: 48px; height: 48px; margin-bottom: 20px;
  border: 1px solid var(--c-green); border-radius: 50%; background: var(--c-paper);
  font: 600 17px/1 var(--f-serif); color: var(--c-gold-text);
}
.section--cream .step__num { background: var(--c-cream); }
.step h3 { margin-bottom: 6px; font-size: 19px; }
.step p { font-size: var(--fs-small); line-height: 1.7; }

@media (max-width: 991px) {
  .steps { grid-template-columns: 1fr; gap: 0; }
  .steps::before { left: 24px; right: auto; top: 24px; bottom: 24px; width: 1px; height: auto; }
  .step { display: grid; grid-template-columns: 48px 1fr; column-gap: 20px; padding-bottom: 28px; }
  .step:last-child { padding-bottom: 0; }
  .step__num { grid-row: span 2; margin-bottom: 0; }
  .step h3 { padding-top: 10px; }
}

/* ---------- 维度列表（无序号） ---------- */
.dim-list { border-top: 1px solid var(--c-line); }
.dim-list li { display: grid; grid-template-columns: 7.5em 1fr; gap: 16px; padding: 18px 0; border-bottom: 1px solid var(--c-line); }
.dim-list strong { color: var(--c-ink); font-weight: 600; }
@media (max-width: 479px) { .dim-list li { grid-template-columns: 1fr; gap: 2px; } }

/* ---------- 常见问题手风琴 ---------- */
.faq { border-top: 1px solid var(--c-line); }
.faq details { border-bottom: 1px solid var(--c-line); }
.faq summary {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 20px 0; cursor: pointer; list-style: none;
  color: var(--c-ink); font-weight: 500;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: ""; flex-shrink: 0; width: 12px; height: 12px;
  background:
    linear-gradient(var(--c-green), var(--c-green)) center / 12px 1.5px no-repeat,
    linear-gradient(var(--c-green), var(--c-green)) center / 1.5px 12px no-repeat;
  transition: transform var(--t-fast);
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq__answer { padding: 0 0 22px; font-size: 16px; max-width: var(--text-measure); }

/* ---------- 标签 ---------- */
.tag { display: inline-block; padding: 2px 10px; border-radius: 2px; background: var(--c-cream); color: var(--c-green); font-size: 14px; line-height: 1.8; }
.section--cream .tag { background: var(--c-paper); }

/* ---------- 引言 ---------- */
.quote { margin: 0; padding: 4px 0 4px 28px; border-left: 1px solid var(--c-gold); font-family: var(--f-serif-text); font-size: clamp(19px, .6vw + 16px, 23px); line-height: 1.75; color: var(--c-ink); max-width: 760px; }

/* ---------- 会做 / 不会做 对照 ---------- */
.compare { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--c-line); border-radius: var(--radius); }
.compare__col { padding: 32px; }
.compare__col + .compare__col { border-left: 1px solid var(--c-line); }
.compare__col h3 { margin-bottom: 16px; }
.compare__col li { position: relative; padding: 8px 0 8px 28px; }
.compare__col li::before { content: ""; position: absolute; left: 2px; top: 1.05em; width: 12px; height: 7px; }
.compare--do li::before { border-left: 1.5px solid var(--c-green); border-bottom: 1.5px solid var(--c-green); transform: rotate(-45deg); top: .9em; }
.compare--dont li::before {
  height: 12px; top: .8em;
  background:
    linear-gradient(45deg, transparent 45%, var(--c-stone) 45%, var(--c-stone) 55%, transparent 55%),
    linear-gradient(-45deg, transparent 45%, var(--c-stone) 45%, var(--c-stone) 55%, transparent 55%);
}
@media (max-width: 767px) {
  .compare { grid-template-columns: 1fr; }
  .compare__col + .compare__col { border-left: 0; border-top: 1px solid var(--c-line); }
}

/* ---------- 文章列表 ---------- */
.post-list { border-top: 1px solid var(--c-line); }
.post-list li { border-bottom: 1px solid var(--c-line); }
.post-list a { display: block; padding: 22px 0; color: inherit; }
.post-list a:hover h4 { color: var(--c-green); }
.post-list h4 { margin: 10px 0 6px; font-size: 18px; transition: color var(--t-fast); }
.post-list time { font-size: 14px; color: var(--c-stone); }

/* ---------- 面包屑与内页标题区 ---------- */
.breadcrumb { font-size: 14px; color: var(--c-stone); margin-bottom: 20px; }
.breadcrumb a { color: var(--c-stone); }
.breadcrumb a:hover { color: var(--c-green); }
.breadcrumb span[aria-hidden] { margin: 0 8px; color: var(--c-line); }

.page-hero { position: relative; overflow: hidden; background: var(--c-green-dk); padding: clamp(56px, 7vw, 96px) 0; }
.page-hero h1 { margin-bottom: 18px; color: var(--c-cream); }
.page-hero p { max-width: 640px; font-size: 19px; color: rgba(246, 243, 236, .84); }
.page-hero .breadcrumb, .page-hero .breadcrumb a { color: rgba(246, 243, 236, .66); }
.page-hero .breadcrumb a:hover { color: #fff; }
.page-hero .breadcrumb span[aria-hidden] { color: rgba(246, 243, 236, .3); }
.page-hero__leaf { position: absolute; right: max(var(--gutter), calc(50% - 620px)); bottom: -24px; width: 200px; opacity: .16; filter: invert(1) brightness(1.4); pointer-events: none; }
@media (max-width: 767px) { .page-hero__leaf { width: 130px; opacity: .35; } }

/* ---------- 表单 ---------- */
.form-card { background: var(--c-paper); border: 1px solid var(--c-line); border-radius: var(--radius); padding: clamp(24px, 3vw, 40px); }
.tabs { display: flex; gap: 32px; border-bottom: 1px solid var(--c-line); margin-bottom: 28px; }
.tabs__btn {
  padding: 0 0 14px; margin-bottom: -1px; background: none; border: 0; border-bottom: 2px solid transparent;
  font: 500 16px/1.4 var(--f-sans); color: var(--c-stone); cursor: pointer;
}
.tabs__btn[aria-selected="true"] { color: var(--c-green-dk); border-bottom-color: var(--c-green-dk); }

.field { margin-bottom: 20px; }
.field label, .field legend { display: block; margin-bottom: 8px; color: var(--c-ink); font-size: 15px; font-weight: 500; padding: 0; }
.field .req { color: var(--c-error); margin-left: 2px; }
.field .hint { display: block; margin-top: 6px; font-size: 14px; color: var(--c-stone); }
.input, .select, .textarea {
  width: 100%; min-height: 48px; padding: 10px 14px;
  font: inherit; font-size: 15px; color: var(--c-ink);
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  transition: border-color var(--t-fast);
}
.textarea { min-height: 112px; resize: vertical; line-height: 1.7; }
.input:focus, .select:focus, .textarea:focus { outline: none; border-color: var(--c-green); box-shadow: 0 0 0 3px rgba(45, 106, 79, .12); }
.field.has-error .input, .field.has-error .select, .field.has-error .textarea { border-color: var(--c-error); }
.field__error { display: none; margin-top: 6px; font-size: 14px; color: var(--c-error); }
.field.has-error .field__error { display: block; }
fieldset.field { border: 0; margin: 0 0 20px; padding: 0; min-width: 0; }

.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip input { position: absolute; opacity: 0; pointer-events: none; }
.chip span {
  display: inline-block; padding: 6px 16px; border: 1px solid var(--c-line); border-radius: 2px;
  font-size: 14px; color: var(--c-ink); background: #fff; cursor: pointer; transition: all var(--t-fast);
}
.chip input:checked + span { border-color: var(--c-green); background: var(--c-green); color: #fff; }
.chip input:focus-visible + span { outline: 2px solid var(--c-green); outline-offset: 2px; }

.check { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; }
.check input { margin-top: 5px; accent-color: var(--c-green-dk); width: 16px; height: 16px; }

/* ---------- 占位（交付前全局搜索 ph 清点） ---------- */
.ph-img {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px;
  width: 100%; height: 100%; min-height: 160px; margin: 0; padding: 24px;
  background: var(--c-cream); border: 1px dashed #CFC6B4; border-radius: var(--radius);
  color: var(--c-stone); font-size: 14px; text-align: center; line-height: 1.6;
}
.section--cream .ph-img { background: #EFEBE1; }
.section--dark .ph-img { background: rgba(246, 243, 236, .06); border-color: rgba(246, 243, 236, .25); color: rgba(246, 243, 236, .7); }
.ph-img img { width: 48px; opacity: .6; }
.ph-img strong { color: var(--c-ink); font-weight: 500; }
.section--dark .ph-img strong { color: var(--c-cream); }

.ph-text { color: #8A918C; font-style: italic; }
.ph-qr {
  display: flex; align-items: center; justify-content: center; width: 128px; height: 128px;
  border: 1px dashed #CFC6B4; border-radius: var(--radius); background: #fff;
  font-size: 12px; color: var(--c-stone); text-align: center; line-height: 1.5;
}
.ph-logo { display: flex; align-items: center; justify-content: center; min-height: 64px; padding: 16px 10px; border-bottom: 1px solid var(--c-line); font-size: 14px; color: #657069; }
.ph-person { display: flex; flex-direction: column; align-items: center; justify-content: center; aspect-ratio: 4 / 5; background: var(--c-cream); border: 1px dashed #CFC6B4; border-radius: var(--radius); color: var(--c-stone); font-size: 14px; }

/* 图库或 AI 概念图上的“示意图”标注 */
.media { position: relative; overflow: hidden; width: 100%; height: 100%; border-radius: var(--radius); background: var(--c-cream); }
.media > img { width: 100%; height: 100%; object-fit: cover; }
.ph-demo { position: absolute; right: 8px; bottom: 7px; padding: 1px 6px; background: rgba(22, 33, 27, .64); color: #fff; font-size: 10px; border-radius: 2px; letter-spacing: .03em; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--c-green-dk); color: rgba(246, 243, 236, .72); font-size: 14px; }
.site-footer a { color: rgba(246, 243, 236, .72); }
.site-footer a:hover { color: var(--c-cream); }
.site-footer__main { display: grid; grid-template-columns: 1.4fr 1fr 1.6fr 128px; gap: 48px; padding-top: 72px; padding-bottom: 56px; }
.site-footer h2 { font-family: var(--f-sans); font-size: 15px; font-weight: 500; color: var(--c-gold-lt); margin-bottom: 18px; letter-spacing: .04em; }
.footer-brand { display: grid; grid-template-columns: 52px 1fr; align-items: center; gap: 18px 12px; margin-bottom: 8px; }
.footer-brand__badge { width: 52px; height: 52px; border-radius: 50%; background: #fff; display: flex; align-items: center; justify-content: center; }
.footer-brand__badge img { width: 40px; }
.footer-brand__name { font-family: var(--f-serif); font-size: 22px; color: var(--c-cream); letter-spacing: .08em; }
.footer-slogan { grid-column: 1 / -1; font-family: var(--f-serif-text); color: var(--c-cream); margin: 0; }
.footer-links li { margin-bottom: 10px; }
.footer-contact li { display: grid; grid-template-columns: 4em 1fr; gap: 8px; margin-bottom: 10px; }
.footer-contact .label { color: rgba(246, 243, 236, .5); }
.footer-reach {
  grid-column: span 2; display: grid; grid-template-columns: minmax(0, 1fr) 128px;
  grid-template-rows: auto auto 1fr; column-gap: 48px; align-content: start;
}
.footer-reach > h2, .footer-reach > .footer-contact { grid-column: 1; }
.footer-reach .footer-contact li { grid-template-columns: 4em minmax(0, 1fr); }
.footer-reach .footer-contact span { min-width: 0; overflow-wrap: anywhere; }
.footer-wechat { grid-column: 2; grid-row: 1 / 4; }
.site-footer a:focus-visible { outline-color: var(--c-gold-lt); }
.site-footer .ph-qr { background: rgba(246, 243, 236, .06); border-color: rgba(246, 243, 236, .25); color: rgba(246, 243, 236, .7); }
.site-footer .ph-text { color: rgba(246, 243, 236, .5); }
.site-footer__bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 32px; padding-top: 24px; padding-bottom: 24px; border-top: 1px solid var(--c-line-dk); font-size: 14px; color: rgba(246, 243, 236, .55); }
.site-footer__bottom a { color: rgba(246, 243, 236, .55); }
.site-footer__bottom ul { display: flex; flex-wrap: wrap; gap: 8px 24px; }

@media (max-width: 991px) {
  .site-footer__main { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-reach { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
/* 容器尚未远离视口右缘时，为固定返回顶部按钮预留法律链接空间。 */
@media (min-width: 768px) and (max-width: 1399px) {
  .site-footer__bottom { padding-right: calc(var(--gutter) + 64px); }
}
@media (max-width: 767px) {
  .site-footer__main { grid-template-columns: minmax(0, 1fr); gap: 24px; padding-top: 36px; padding-bottom: 28px; }
  .footer-brand { grid-template-columns: 44px minmax(0, 1fr); gap: 0 12px; margin-bottom: 14px; }
  .footer-brand__badge { grid-row: span 2; width: 44px; height: 44px; }
  .footer-brand__badge img { width: 34px; }
  .footer-slogan { grid-column: 2; }
  .site-footer h2 { margin-bottom: 8px; }
  .footer-links { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 24px; }
  .footer-links li { margin: 0; }
  .footer-links a { display: flex; align-items: center; min-height: 44px; }
  .footer-reach { grid-column: 1; grid-template-columns: minmax(0, 1fr) 128px; grid-template-rows: auto auto 1fr; column-gap: 16px; }
  .footer-reach > h2, .footer-reach > .footer-contact--address { grid-column: 1 / -1; }
  .footer-reach > h2 { margin-bottom: 12px; }
  .footer-reach .footer-contact li { grid-template-columns: 2em minmax(0, 1fr); gap: 8px; margin-bottom: 8px; }
  .footer-reach .footer-contact--address li { margin-bottom: 16px; }
  .footer-contact--details li:last-child { margin-bottom: 0; }
  .footer-wechat { grid-row: 3; }
  .site-footer__bottom { gap: 4px; padding-top: 16px; padding-bottom: 20px; }
  .site-footer__bottom > span { width: 100%; }
  .site-footer__bottom ul { gap: 0 20px; padding-right: 48px; }
  .site-footer__bottom a { display: flex; align-items: center; min-height: 44px; }
}

/* ---------- 手机底部操作栏 ---------- */
.mobile-bar { display: none; }
@media (max-width: 767px) {
  .mobile-bar {
    display: grid; grid-template-columns: 1fr 1fr; gap: 1px;
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 40;
    background: var(--c-line); border-top: 1px solid var(--c-line);
    padding-bottom: env(safe-area-inset-bottom);
  }
  .mobile-bar a { display: flex; align-items: center; justify-content: center; height: 52px; font-size: 15px; font-weight: 500; }
  .mobile-bar a:first-child { background: var(--c-green-dk); color: var(--c-cream); }
  .mobile-bar a:last-child { background: var(--c-paper); color: var(--c-green-dk); }
  body { padding-bottom: calc(52px + env(safe-area-inset-bottom)); }
}
.card__media .media { border-radius: 0; }

/* ---------- 返回顶部 ---------- */
.to-top {
  position: fixed; right: clamp(16px, 2.4vw, 32px); bottom: clamp(20px, 2.4vw, 32px); z-index: 45;
  display: flex; align-items: center; justify-content: center;
  width: 48px; height: 48px; padding: 0; cursor: pointer;
  color: var(--c-cream); background: var(--c-green-dk);
  border: 0; border-radius: 50%;
  box-shadow: inset 0 0 0 1px rgba(212, 185, 138, .55), 0 6px 20px rgba(27, 67, 50, .22);
  opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: opacity .25s ease, transform .25s ease, visibility .25s, background-color var(--t-fast), box-shadow var(--t-fast);
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.to-top svg { transition: transform var(--t-fast); }
.to-top:hover { background: var(--c-green); box-shadow: inset 0 0 0 1px var(--c-gold-lt), 0 8px 24px rgba(27, 67, 50, .3); }
.to-top:hover svg { transform: translateY(-2px); }
.to-top:focus-visible { outline: 2px solid var(--c-gold); outline-offset: 3px; }
@media (max-width: 767px) {
  /* 避开底部双按钮操作栏 */
  .to-top { bottom: calc(52px + 16px + env(safe-area-inset-bottom)); width: 44px; height: 44px; }
}
@media (prefers-reduced-motion: reduce) { .to-top, .to-top svg { transition: none; } }