/* 配色与 img/logo.webp 一致：青绿渐变 #16B795 → #48D38A，图形白色 */
:root {
  --bg: #f0faf5;
  --bg-card: #ffffff;
  --ink: #1a2e2a;
  --ink-muted: #4a6670;
  --accent: #26c281;
  --accent-deep: #0f8f6c;
  --accent-teal: #16b795;
  --accent-mint: #48d38a;
  --leaf: #6fe0a7;
  --border: rgba(10, 90, 74, 0.12);
  --shadow: 0 18px 48px rgba(10, 90, 74, 0.08);
  --shadow-btn: 0 8px 26px rgba(22, 183, 149, 0.38);
  --tint-fill: rgba(22, 183, 149, 0.1);
  --tint-border: rgba(22, 183, 149, 0.22);
  --tint-soft: rgba(22, 183, 149, 0.08);
  --tint-medium: rgba(22, 183, 149, 0.14);
  --radius: 14px;
  --font-display: "ZCOOL XiaoWei", "Songti SC", serif;
  --font-body: "Noto Sans SC", system-ui, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 0.65rem 1rem;
  background: var(--accent-deep);
  color: #fff;
  font-weight: 600;
  border-radius: 0 0 8px 0;
}

.skip-link:focus {
  left: 0;
  outline: 2px solid var(--leaf);
  outline-offset: 2px;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

a:focus-visible,
button:focus-visible,
.btn:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.wrap {
  width: min(1120px, 92vw);
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(240, 250, 245, 0.94);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 0;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--accent-deep);
  min-width: 0;
}

.logo:hover {
  text-decoration: none;
  color: var(--accent-teal);
}

.logo-img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: 11px;
  flex-shrink: 0;
  box-shadow: 0 4px 16px rgba(22, 183, 149, 0.28);
}

.logo-text {
  font-family: var(--font-display);
  font-size: clamp(1rem, 2.5vw, 1.35rem);
  line-height: 1.25;
  color: var(--accent-deep);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: min(52vw, 16rem);
}

@media (max-width: 520px) {
  .logo-text {
    white-space: normal;
    max-width: 11rem;
    font-size: 0.95rem;
  }
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-desktop a {
  color: var(--ink-muted);
  font-size: 0.95rem;
  text-decoration: none;
  transition: color 0.2s;
}

.nav-desktop a:hover {
  color: var(--accent-deep);
  text-decoration: none;
}

/* 导航内主按钮：覆盖 .nav-desktop a 的字色，保证白字对比度 */
.nav-desktop a.btn-primary,
.nav-desktop a.btn-primary:hover {
  color: #fff;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.35rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s;
  text-decoration: none;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(
    135deg,
    var(--accent-teal) 0%,
    var(--accent) 48%,
    var(--accent-mint) 100%
  );
  color: #fff;
  box-shadow: var(--shadow-btn);
}

.btn-primary:hover {
  color: #fff;
  box-shadow: 0 10px 30px rgba(22, 183, 149, 0.45);
}

.btn-ghost {
  background: transparent;
  color: var(--accent-deep);
  border: 1.5px solid var(--accent-teal);
}

.btn-ghost:hover {
  background: var(--tint-soft);
  color: var(--accent-deep);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-card);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
  border-radius: 1px;
}

@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
  }

  .nav-desktop {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    padding: 1rem 1.5rem 1.25rem;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    gap: 0.75rem;
    align-items: stretch;
  }

  .nav-desktop.is-open {
    display: flex;
  }

  .nav-desktop .btn {
    width: 100%;
  }
}

/* Hero */
.hero {
  padding: clamp(3rem, 8vw, 5.5rem) 0 clamp(4rem, 10vw, 6rem);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -40% -20% auto -20%;
  height: 85%;
  background: radial-gradient(
    ellipse at 50% 0%,
    rgba(72, 211, 138, 0.38) 0%,
    rgba(22, 183, 149, 0.12) 42%,
    transparent 58%
  );
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
  position: relative;
}

@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 4.5vw, 3.15rem);
  font-weight: 400;
  line-height: 1.2;
  color: var(--accent-deep);
  margin: 0 0 1rem;
  letter-spacing: 0.02em;
}

.hero-lead {
  font-size: 1.1rem;
  color: var(--ink-muted);
  margin: 0 0 1.75rem;
  max-width: 34ch;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
  margin-bottom: 1.75rem;
}

.badge {
  font-size: 0.8rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: var(--tint-fill);
  color: var(--accent-deep);
  border: 1px solid var(--tint-border);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-visual {
  position: relative;
  min-height: 280px;
}

.phone-mock {
  margin-inline: auto;
  width: min(280px, 85%);
  aspect-ratio: 9 / 18.5;
  border-radius: 36px;
  background: linear-gradient(
    165deg,
    #085848 0%,
    var(--accent-teal) 42%,
    var(--accent-mint) 100%
  );
  box-shadow: var(--shadow), 0 0 0 4px rgba(255, 255, 255, 0.65);
  padding: 14px 12px;
  position: relative;
}

.phone-mock::after {
  content: "";
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  width: 36%;
  height: 22px;
  background: #043d32;
  border-radius: 12px;
}

.phone-screen {
  margin-top: 28px;
  height: calc(100% - 28px);
  border-radius: 24px;
  background: linear-gradient(180deg, #ecfdf7 0%, #d4f5e8 100%);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.phone-stat {
  background: #fff;
  border-radius: 12px;
  padding: 0.75rem 1rem;
  font-size: 0.75rem;
  color: var(--ink-muted);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.phone-stat strong {
  display: block;
  font-size: 1.35rem;
  color: var(--accent-deep);
  margin-top: 0.2rem;
}

.phone-bar {
  height: 8px;
  border-radius: 4px;
  background: #e0e0e0;
  margin-top: 0.5rem;
  overflow: hidden;
}

.phone-bar > span {
  display: block;
  height: 100%;
  width: 72%;
  border-radius: 4px;
  background: var(--accent);
}

/* Sections */
section {
  padding: clamp(3.5rem, 7vw, 5rem) 0;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  color: var(--accent-deep);
  text-align: center;
  margin: 0 0 0.5rem;
  font-weight: 400;
}

.section-sub {
  text-align: center;
  color: var(--ink-muted);
  max-width: 42rem;
  margin: 0 auto 2.5rem;
  font-size: 1.02rem;
}

.bg-alt {
  background: linear-gradient(180deg, #e5f9f2 0%, var(--bg) 100%);
}

/* Feature grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.feature-grid.cols-2 {
  grid-template-columns: repeat(2, 1fr);
}

@media (max-width: 900px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }

  .feature-grid.cols-2 {
    grid-template-columns: 1fr;
  }
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.35rem;
  box-shadow: 0 4px 20px rgba(10, 90, 74, 0.05);
  transition: box-shadow 0.25s, transform 0.2s;
}

.feature-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--tint-fill);
  color: var(--accent-deep);
  display: grid;
  place-items: center;
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  color: var(--accent-deep);
}

.feature-card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--ink-muted);
  line-height: 1.6;
}

/* Architecture */
.arch-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 768px) {
  .arch-grid {
    grid-template-columns: 1fr;
  }
}

.arch-panel {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 1.75rem;
  box-shadow: 0 4px 24px rgba(10, 90, 74, 0.06);
}

.arch-panel h3 {
  margin: 0 0 1rem;
  font-size: 1.15rem;
  color: var(--accent-deep);
}

.arch-list {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--ink-muted);
  font-size: 0.95rem;
}

.arch-list li {
  margin-bottom: 0.65rem;
}

.arch-diagram {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.arch-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.arch-box {
  flex: 1;
  min-width: 120px;
  padding: 0.85rem 1rem;
  border-radius: 10px;
  text-align: center;
  font-size: 0.88rem;
  font-weight: 600;
}

.arch-box.client {
  background: #d4f5e8;
  color: #065a48;
}

.arch-box.branch {
  background: #a8eed0;
  color: #065a48;
}

.arch-box.hq {
  background: #7ad9b8;
  color: #043d32;
}

.arch-arrow {
  color: var(--ink-muted);
  font-size: 1.2rem;
}

/* Timeline / modules list */
.module-list {
  display: grid;
  gap: 1rem;
  max-width: 800px;
  margin-inline: auto;
}

.module-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: start;
  padding: 1.25rem 1.5rem;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.module-num {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--accent-teal) 0%, var(--accent) 100%);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.95rem;
  flex-shrink: 0;
}

.module-item h4 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
  color: var(--accent-deep);
}

.module-item p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--ink-muted);
}

/* CTA band */
.cta-band {
  background: linear-gradient(135deg, #064a3d 0%, #0a7a62 42%, var(--accent-teal) 100%);
  color: #f0fdf9;
  text-align: center;
  padding: clamp(3rem, 6vw, 4.5rem) 1.5rem;
  border-radius: var(--radius);
  margin: 0 auto;
  max-width: min(1120px, 92vw);
}

.cta-band h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.6rem, 3vw, 2rem);
  margin: 0 0 0.75rem;
  color: #fff;
}

.cta-band p {
  margin: 0 auto 1.5rem;
  max-width: 36ch;
  opacity: 0.92;
  font-size: 1rem;
}

.cta-band .btn-primary {
  background: #fff;
  color: var(--accent-deep);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.cta-band .btn-primary:hover {
  color: var(--accent-deep);
}

/* Footer */
.site-footer {
  padding: 2.5rem 0 2rem;
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: space-between;
  align-items: center;
  font-size: 0.88rem;
  color: var(--ink-muted);
}

.footer-links {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--ink-muted);
}

.footer-links a:hover {
  color: var(--accent);
}

.footer-inner p a {
  color: inherit;
  text-decoration: none;
}

.footer-inner p a:hover {
  color: var(--accent);
  text-decoration: underline;
}

/* Legal / policy pages */
main.legal-main {
  padding: clamp(2rem, 5vw, 3.5rem) 0 clamp(3rem, 6vw, 4rem);
}

.legal-doc {
  max-width: 42rem;
  margin-inline: auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(1.5rem, 4vw, 2.5rem) clamp(1.25rem, 4vw, 2.25rem);
  box-shadow: 0 4px 24px rgba(10, 90, 74, 0.06);
}

.legal-doc h1 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 1.85rem);
  font-weight: 400;
  color: var(--accent-deep);
  margin: 0 0 0.5rem;
  line-height: 1.3;
}

.legal-meta {
  font-size: 0.88rem;
  color: var(--ink-muted);
  margin: 0 0 2rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.legal-doc h2 {
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--accent-deep);
  margin: 1.75rem 0 0.65rem;
}

.legal-doc h2:first-of-type {
  margin-top: 0;
}

.legal-doc p,
.legal-doc li {
  font-size: 0.95rem;
  color: var(--ink-muted);
  margin: 0 0 0.75rem;
}

.legal-doc ul,
.legal-doc ol {
  margin: 0 0 0.75rem;
  padding-left: 1.35rem;
}

.legal-doc li {
  margin-bottom: 0.45rem;
}

.legal-doc strong {
  color: var(--ink);
  font-weight: 600;
}

.legal-note {
  font-size: 0.88rem;
  padding: 0.85rem 1rem;
  border-radius: 10px;
  background: var(--tint-soft);
  border: 1px solid var(--tint-medium);
  color: var(--ink-muted);
  margin-bottom: 1.5rem;
}

.nav-desktop a.nav-active {
  color: var(--accent-deep);
  font-weight: 600;
}

/* FAQ */
.faq-list {
  max-width: 40rem;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(10, 90, 74, 0.05);
}

.faq-item summary {
  padding: 1rem 1.15rem;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--accent-deep);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

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

.faq-item summary::after {
  content: "＋";
  font-size: 1rem;
  color: var(--accent);
  flex-shrink: 0;
}

.faq-item[open] summary::after {
  content: "－";
}

.faq-item .faq-answer {
  padding: 0 1.15rem 1.1rem;
  margin: 0;
  font-size: 0.93rem;
  color: var(--ink-muted);
  line-height: 1.65;
  border-top: 1px solid var(--border);
  padding-top: 0.85rem;
}

/* 404 */
.page-404 {
  min-height: 55vh;
  display: grid;
  place-items: center;
  padding: 3rem 1rem;
  text-align: center;
}

.page-404 h1 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  color: var(--accent-deep);
  margin: 0 0 0.5rem;
  font-weight: 400;
}

.page-404 p {
  color: var(--ink-muted);
  margin: 0 0 1.5rem;
  max-width: 28ch;
  margin-inline: auto;
}

.page-404 .code {
  font-size: 4rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.75rem;
  font-family: var(--font-body);
}

/* Contact page */
.contact-grid {
  display: grid;
  gap: 1rem;
  max-width: 36rem;
  margin-inline: auto;
}

.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.35rem 1.25rem;
}

.contact-card h2 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  color: var(--accent-deep);
}

.contact-card p {
  margin: 0;
  font-size: 0.93rem;
  color: var(--ink-muted);
  line-height: 1.6;
}

.legal-doc .contact-follow {
  margin-top: 2rem;
  margin-bottom: 0;
  font-size: 0.9rem;
  color: var(--ink-muted);
}