/* 极简高端 · 无图 · 纯静态 — 三亚嘉佑永丰 */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #ffffff;
  --text: #111111;
  --muted: #666666;
  --line: #e8e8e8;
  --accent: #c9a86a;
  --accent-hover: #b08d4f;
  --surface: #fafafa;
  --max: 920px;
  --narrow: 640px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--text);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  transition: color 0.2s ease;
}
a:hover {
  color: var(--accent);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 9999;
  padding: 0.5rem 1rem;
  background: var(--text);
  color: var(--bg);
}
.skip-link:focus {
  left: 0;
}

.shell-inner {
  width: min(100% - 48px, var(--max));
  margin-inline: auto;
}

/* —— Header —— */
.shell-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.shell-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 0;
  flex-wrap: wrap;
}

.shell-logo {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  text-decoration: none;
  color: var(--text);
}
.shell-logo:hover {
  color: var(--text);
}
.shell-logo-mark {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.shell-logo-sub {
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.06em;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 8px;
  border: none;
  background: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 1px;
  background: var(--text);
}

.shell-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
  align-items: center;
}
.shell-nav a {
  font-size: 0.875rem;
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.02em;
}
.shell-nav a:hover,
.shell-nav a[aria-current="page"] {
  color: var(--accent);
}

.shell-actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}

@media (max-width: 880px) {
  .nav-toggle {
    display: flex;
    margin-left: auto;
  }
  .shell-nav,
  .shell-actions {
    display: none;
    width: 100%;
  }
  .shell-bar.is-open .shell-nav,
  .shell-bar.is-open .shell-actions {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding-bottom: 0.75rem;
  }
  .shell-bar.is-open .shell-nav ul {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* —— Buttons —— */
.btn-line {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 1.2rem;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  border: 1px solid var(--text);
  color: var(--text);
  background: transparent;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.btn-line:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}
.btn-line--accent {
  border-color: var(--accent);
  color: var(--accent);
}
.btn-line--accent:hover {
  background: var(--accent);
  color: var(--bg);
}

.btn-ghost {
  font-size: 0.8125rem;
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.06em;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.35rem 0;
}
.btn-ghost:hover {
  color: var(--accent);
}

/* —— Hero —— */
.hero-min {
  min-height: 88vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 5rem 24px 4rem;
  border-bottom: 1px solid var(--line);
}

.hero-min__logo {
  font-size: 0.75rem;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 2.5rem;
}

.hero-min h1 {
  font-size: clamp(2.25rem, 5.5vw, 3.5rem);
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: -0.02em;
  max-width: 14ch;
  margin-bottom: 1.75rem;
}

.hero-min__lead {
  font-size: 1.125rem;
  color: var(--muted);
  max-width: 28ch;
  margin-bottom: 2.75rem;
  line-height: 1.85;
}

.hero-min__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 2rem;
}

.hero-min__micro {
  font-size: 0.8125rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* —— Bands —— */
.band {
  padding: 5.5rem 24px;
  border-bottom: 1px solid var(--line);
}
.band--surface {
  background: var(--surface);
}

.band__label {
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 2.5rem;
}

/* Value lines */
.value-stack {
  max-width: var(--narrow);
}
.value-row {
  margin-bottom: 3.5rem;
}
.value-row:last-child {
  margin-bottom: 0;
}
.value-row p {
  font-size: 1.5rem;
  line-height: 1.5;
  font-weight: 400;
}
.value-row p strong {
  font-weight: 600;
  color: var(--text);
}
.value-row .muted {
  display: block;
  margin-top: 0.75rem;
  font-size: 1rem;
  color: var(--muted);
  font-weight: 400;
}

/* Services — list, no cards */
.svc-list {
  max-width: var(--max);
}
.svc-item {
  padding: 3rem 0;
  border-top: 1px solid var(--text);
}
.svc-item:first-child {
  border-top: none;
  padding-top: 0;
}
.svc-item h3 {
  font-size: 1.75rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}
.svc-item .rule {
  width: 2.5rem;
  height: 1px;
  background: var(--accent);
  margin-bottom: 1.25rem;
}
.svc-item p {
  color: var(--muted);
  font-size: 1rem;
  max-width: 42ch;
  margin-bottom: 1.25rem;
}
.svc-item a {
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* Mega trust */
.mega-head {
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 3rem;
}
.mega-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 3rem 4rem;
  max-width: 720px;
}
@media (max-width: 600px) {
  .mega-grid {
    grid-template-columns: 1fr;
  }
}
.mega-num {
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--text);
}
.mega-num span {
  color: var(--accent);
}
.mega-cap {
  margin-top: 1rem;
  font-size: 0.9375rem;
  color: var(--muted);
  line-height: 1.6;
}
.mega-note {
  margin-top: 3.5rem;
  max-width: 48ch;
  font-size: 0.8125rem;
  color: var(--muted);
  line-height: 1.7;
}

/* Case study text */
.case-block {
  max-width: var(--narrow);
  padding: 3.5rem 0;
  border-top: 1px solid var(--line);
}
.case-block:first-of-type {
  border-top: none;
  padding-top: 0;
}
.case-block h3 {
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  margin-bottom: 2rem;
}
.case-rows {
  display: grid;
  gap: 1.25rem;
  margin-bottom: 2rem;
  font-size: 0.9375rem;
}
.case-rows dt {
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 0.35rem;
}
.case-rows dd {
  font-size: 1.125rem;
}
.case-divider {
  width: 100%;
  height: 1px;
  background: var(--line);
  margin: 2rem 0;
}
.case-quote {
  font-style: italic;
  color: var(--muted);
  line-height: 1.75;
}

/* 成交引导型案例（cases.html 全文） */
.case-story {
  max-width: var(--narrow);
  padding-bottom: 3.5rem;
  margin-bottom: 0;
  border-bottom: 1px solid var(--line);
}
.case-story:last-of-type {
  border-bottom: none;
  padding-bottom: 0;
}
.case-story h2 {
  font-size: clamp(1.15rem, 2.5vw, 1.35rem);
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.35;
  margin-bottom: 1.75rem;
  padding-top: 3rem;
}
.case-story:first-of-type h2 {
  padding-top: 0;
}
.case-mirror {
  margin-bottom: 1.75rem;
}
.case-mirror-lead {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.75rem;
}
.case-mirror ul {
  margin-left: 1.2rem;
  color: var(--muted);
  font-size: 0.9375rem;
}
.case-mirror li {
  margin-bottom: 0.4rem;
}
.case-sect {
  margin-bottom: 1.75rem;
}
.case-sect h3 {
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 0.65rem;
}
.case-sect p,
.case-sect ul {
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.75;
}
.case-sect ul {
  margin-left: 1.2rem;
  margin-top: 0.35rem;
}
.case-sect li {
  margin-bottom: 0.35rem;
}
.case-foot {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}
.case-foot > p {
  font-size: 0.9375rem;
  color: var(--text);
  margin-bottom: 1rem;
  max-width: 42ch;
  line-height: 1.7;
}
.case-legal {
  font-size: 0.75rem;
  color: var(--muted);
  line-height: 1.65;
  margin-top: 1.25rem;
  max-width: 48ch;
}

/* 首页案例摘要 */
.case-teaser {
  max-width: var(--narrow);
  padding: 2rem 0;
  border-top: 1px solid var(--line);
}
.case-teaser:first-of-type {
  border-top: none;
  padding-top: 0;
}
.case-teaser h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.65rem;
  letter-spacing: 0.02em;
}
.case-teaser h3 a {
  text-decoration: none;
  color: var(--text);
}
.case-teaser h3 a:hover {
  color: var(--accent);
}
.case-teaser-mirror {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
  line-height: 1.65;
}
.case-teaser-result {
  font-size: 0.875rem;
  color: var(--text);
  margin-bottom: 0.75rem;
  line-height: 1.65;
}
.case-teaser-more {
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.case-summary-band {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
  max-width: var(--narrow);
}
.case-summary-band p {
  font-size: 0.9375rem;
  color: var(--muted);
  line-height: 1.75;
  margin-bottom: 1.25rem;
  max-width: 42ch;
}

/* Process vertical */
.flow-vertical {
  max-width: 280px;
}
.flow-vertical li {
  list-style: none;
  font-size: 1.25rem;
  letter-spacing: 0.08em;
  padding: 1.25rem 0;
  border-bottom: none;
  position: relative;
}
.flow-vertical li::after {
  content: "—";
  display: block;
  color: var(--accent);
  font-size: 1rem;
  margin-top: 1.25rem;
  font-weight: 300;
}
.flow-vertical li:last-child::after {
  display: none;
}

/* Closing CTA */
.closing {
  text-align: center;
  padding: 6rem 24px;
}
.closing h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 500;
  line-height: 1.45;
  max-width: 22ch;
  margin: 0 auto 1rem;
}
.closing > .shell-inner > p {
  color: var(--muted);
  max-width: 32ch;
  margin: 0 auto 3rem;
}
.contact-lines {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  margin-bottom: 2rem;
}
.contact-lines p {
  font-size: 1.0625rem;
}
.contact-lines a {
  font-weight: 500;
}
.copy-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

/* Footer */
.site-footer-min {
  padding: 4rem 24px 3rem;
  border-top: 1px solid var(--line);
  background: var(--bg);
}
.site-footer-min .shell-inner {
  display: grid;
  gap: 2.5rem;
}
@media (min-width: 720px) {
  .site-footer-min .shell-inner {
    grid-template-columns: 1.4fr 1fr 1fr;
  }
}
.footer-brand p {
  font-size: 0.9375rem;
  margin-bottom: 0.5rem;
}
.footer-brand .tag {
  font-size: 0.8125rem;
  color: var(--muted);
  line-height: 1.7;
  max-width: 32ch;
}
.footer-col h3 {
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1rem;
}
.footer-col ul {
  list-style: none;
}
.footer-col li {
  margin-bottom: 0.5rem;
}
.footer-col a {
  font-size: 0.875rem;
  color: var(--muted);
  text-decoration: none;
}
.footer-col a:hover {
  color: var(--accent);
}
.footer-legal {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--muted);
  line-height: 1.6;
}
.footer-legal a {
  color: var(--muted);
  text-decoration: underline;
}
.footer-legal a:hover {
  color: var(--accent);
}

/* Inner pages */
.page-hero {
  padding: 5rem 24px 3rem;
  border-bottom: 1px solid var(--line);
}
.page-hero h1 {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  max-width: 18ch;
  margin-bottom: 1.25rem;
}
.page-hero .lede {
  color: var(--muted);
  max-width: 40ch;
  font-size: 1.0625rem;
}

.editorial {
  padding: 3.5rem 24px 5rem;
}
.editorial .shell-inner {
  max-width: 38rem;
}
.editorial h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 2.5rem 0 1rem;
}
.editorial h2:first-child {
  margin-top: 0;
}
.editorial p,
.editorial li {
  color: var(--muted);
  margin-bottom: 1rem;
}
.editorial ul {
  margin-left: 1.25rem;
  margin-bottom: 1rem;
}
.editorial .cta-block {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

/* Article list */
.list-articles {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.list-articles a {
  display: block;
  padding: 2rem 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  transition: color 0.2s;
}
.list-articles a:hover h3 {
  color: var(--accent);
}
.list-articles h3 {
  font-size: 1.125rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  transition: color 0.2s;
}
.list-articles p {
  font-size: 0.9375rem;
  color: var(--muted);
}

/* Reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.reveal-stagger.is-visible > * {
  opacity: 1;
  transform: translateY(0);
}
.reveal-stagger.is-visible > *:nth-child(1) {
  transition-delay: 0.05s;
}
.reveal-stagger.is-visible > *:nth-child(2) {
  transition-delay: 0.12s;
}
.reveal-stagger.is-visible > *:nth-child(3) {
  transition-delay: 0.19s;
}
.reveal-stagger.is-visible > *:nth-child(4) {
  transition-delay: 0.26s;
}

/* 404 */
.page-min {
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 3rem 24px;
}
.page-min h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
}
.page-min p {
  color: var(--muted);
  margin-bottom: 2rem;
}

/* 微信二维码（assets/wechat-qr.png） */
.wechat-qr-wrap {
  margin: 1.5rem 0 2rem;
  max-width: 220px;
}
.wechat-qr-wrap img {
  display: block;
  width: 100%;
  max-width: 220px;
  height: auto;
  border: 1px solid var(--line);
  background: var(--bg);
}
.wechat-qr-caption {
  font-size: 0.8125rem;
  color: var(--muted);
  line-height: 1.65;
  margin-top: 0.85rem;
  max-width: 260px;
}