/* 对信 — 深蓝底色 + 荧光绿强调 */
:root {
  --bg: #081226;
  --bg-2: #0b1a33;
  --surface: #0e2140;
  --line: rgba(140, 175, 230, 0.16);
  --line-strong: rgba(140, 175, 230, 0.30);
  --text: #e8eff9;
  --text-dim: #9fb0c9;
  --accent: #3dfc9f;
  --accent-dim: rgba(61, 252, 159, 0.12);
  --accent-glow: 0 0 24px rgba(61, 252, 159, 0.25);
  --danger: #ff7b7b;
  --radius: 14px;
  --max: 1120px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", system-ui, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* 顶部微光，仅此一处氛围光 */
body::before {
  content: "";
  position: fixed;
  inset: 0 0 auto 0;
  height: 480px;
  background: radial-gradient(60% 100% at 50% 0%, rgba(61, 252, 159, 0.07), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.container { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 780px; }

h1, h2, h3 { line-height: 1.25; font-weight: 700; letter-spacing: 0.01em; }

a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 10px 22px;
  font-size: 15px;
  font-family: inherit;
  cursor: pointer;
  transition: border-color .18s ease, box-shadow .18s ease, background-color .18s ease, transform .18s ease;
  text-align: center;
}
.btn-accent {
  background: var(--accent);
  color: #04251a;
  font-weight: 700;
  box-shadow: var(--accent-glow);
}
.btn-accent:hover { box-shadow: 0 0 34px rgba(61, 252, 159, 0.4); transform: translateY(-1px); }
.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--line-strong);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-lg { padding: 13px 30px; font-size: 16px; }
.btn-sm { padding: 7px 16px; font-size: 14px; }
.btn-block { width: 100%; }

.link-btn {
  background: none; border: none; font: inherit; color: inherit;
  cursor: pointer; padding: 0; text-align: left;
}
.link-btn:hover { color: var(--accent); }

.tag {
  display: inline-block;
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--text-dim);
}
.tag-green {
  color: var(--accent);
  border-color: rgba(61, 252, 159, 0.4);
  background: var(--accent-dim);
}

/* ---------- 头部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(8, 18, 38, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  width: 18px; height: 18px; border-radius: 50%;
  border: 2px solid var(--accent);
  position: relative;
  box-shadow: var(--accent-glow);
}
.brand-mark::after {
  content: ""; position: absolute; inset: 4px;
  border-radius: 50%; background: var(--accent);
}
.brand-name { font-size: 20px; font-weight: 800; letter-spacing: 0.04em; }

.site-nav { display: flex; gap: 28px; }
.site-nav a {
  font-size: 15px;
  color: var(--text-dim);
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}
.site-nav a:hover { color: var(--text); border-bottom-color: var(--accent); }

/* ---------- 首屏 ---------- */
.hero { position: relative; z-index: 1; padding: 96px 0 72px; }
.hero-inner { text-align: center; }
.eyebrow {
  color: var(--accent);
  font-size: 14px;
  letter-spacing: 0.2em;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(38px, 6.4vw, 68px);
  letter-spacing: 0.02em;
}
.hero-sub {
  max-width: 620px;
  margin: 24px auto 0;
  color: var(--text-dim);
  font-size: 17px;
}
.hero-actions {
  display: flex; justify-content: center; gap: 16px; flex-wrap: wrap;
  margin-top: 36px;
}
.hero-stats {
  display: flex; justify-content: center; gap: 0;
  margin-top: 64px;
  border-top: 1px solid var(--line);
  padding-top: 32px;
  flex-wrap: wrap;
}
.hero-stats > div {
  min-width: 170px;
  padding: 0 32px;
  border-right: 1px solid var(--line);
}
.hero-stats > div:last-child { border-right: none; }
.hero-stats dt { font-size: 13px; color: var(--text-dim); }
.hero-stats dd { font-size: 28px; font-weight: 800; color: var(--accent); margin-top: 4px; }

/* ---------- 通用区块 ---------- */
.section { padding: 88px 0; position: relative; z-index: 1; }
.section-head { max-width: 640px; margin-bottom: 44px; }
.section-head h2 { font-size: clamp(28px, 4.4vw, 42px); }
.section-head p { color: var(--text-dim); margin-top: 14px; font-size: 16px; }

/* ---------- 产品预览 ---------- */
.app-frame {
  background: var(--bg-2);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(2, 8, 20, 0.6), 0 0 40px rgba(61, 252, 159, 0.05);
}
.app-chrome {
  display: flex; align-items: center; gap: 8px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: rgba(14, 33, 64, 0.6);
}
.app-chrome .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--line-strong); }
.app-title { margin-left: 10px; font-size: 13px; color: var(--text-dim); }

.app-body { display: grid; grid-template-columns: 190px 1fr 240px; }

.app-side {
  border-right: 1px solid var(--line);
  padding: 20px 16px;
  background: rgba(8, 18, 38, 0.5);
}
.app-side-label {
  font-size: 11px; color: var(--text-dim); letter-spacing: 0.12em;
  margin: 18px 0 8px;
}
.app-side-label:first-child { margin-top: 0; }
.app-side-item {
  font-size: 13px; color: var(--text-dim);
  padding: 7px 10px; border-radius: 8px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.app-side-item.is-active {
  color: var(--text); background: var(--accent-dim);
  border: 1px solid rgba(61, 252, 159, 0.3);
}
.app-avatars { display: flex; gap: 6px; }
.avatar {
  width: 30px; height: 30px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; color: #06121f;
  background: var(--a, #5b8def);
}
.avatar.sm { width: 26px; height: 26px; font-size: 11px; flex: none; }

.app-main { padding: 22px 24px; min-width: 0; }
.app-main-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.app-main-head h3 { font-size: 17px; }
.task-list { display: flex; flex-direction: column; gap: 8px; }
.task {
  display: flex; align-items: center; gap: 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 11px 14px;
  background: var(--surface);
  transition: border-color .18s ease;
}
.task:hover { border-color: var(--line-strong); }
.task.is-muted { opacity: 0.55; }
.task-text { flex: 1; min-width: 0; }
.task-text strong { display: block; font-size: 14px; font-weight: 600; }
.task-text small { font-size: 12px; color: var(--text-dim); }
.check {
  width: 18px; height: 18px; flex: none; border-radius: 6px;
  border: 1.5px solid var(--line-strong);
  position: relative;
}
.check.is-done { border-color: var(--accent); background: var(--accent-dim); }
.check.is-done::after {
  content: ""; position: absolute;
  left: 5px; top: 1px; width: 5px; height: 9px;
  border: 2px solid var(--accent); border-top: none; border-left: none;
  transform: rotate(38deg);
}

.app-progress {
  border-left: 1px solid var(--line);
  padding: 22px 20px;
  background: rgba(8, 18, 38, 0.5);
}
.app-progress h3 { font-size: 15px; margin-bottom: 16px; }
.progress-ring {
  width: 110px; height: 110px; margin: 0 auto 8px;
  border-radius: 50%;
  background: conic-gradient(var(--accent) calc(var(--p) * 1%), rgba(140, 175, 230, 0.15) 0);
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--accent-glow);
}
.progress-ring::before {
  content: ""; position: absolute; inset: 11px; border-radius: 50%; background: var(--bg-2);
}
.progress-ring { position: relative; }
.progress-ring span { position: relative; font-size: 22px; font-weight: 800; color: var(--accent); }
.progress-note { text-align: center; font-size: 12px; color: var(--text-dim); margin-bottom: 18px; }
.progress-note strong { color: var(--accent); }
.progress-bar-row { margin-bottom: 12px; }
.progress-bar-row p {
  display: flex; justify-content: space-between;
  font-size: 12px; color: var(--text-dim); margin-bottom: 4px;
}
.bar { height: 6px; border-radius: 999px; background: rgba(140, 175, 230, 0.15); overflow: hidden; }
.bar i { display: block; height: 100%; border-radius: 999px; background: var(--accent); }
.ai-summary {
  margin-top: 18px; padding: 12px 14px;
  border: 1px solid rgba(61, 252, 159, 0.3);
  border-radius: 10px;
  background: var(--accent-dim);
  font-size: 12.5px;
}
.ai-summary-label { color: var(--accent); font-weight: 700; margin-bottom: 4px; font-size: 12px; }

/* ---------- 核心功能 ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 26px;
  background: var(--bg-2);
  transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease;
}
.feature-card:hover {
  border-color: rgba(61, 252, 159, 0.45);
  box-shadow: 0 0 30px rgba(61, 252, 159, 0.08);
  transform: translateY(-2px);
}
.feature-card h3 { font-size: 20px; margin-bottom: 12px; }
.feature-card p { color: var(--text-dim); font-size: 15px; }

/* ---------- 客户评价 ---------- */
.quote-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.quote-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 26px;
  background: var(--surface);
}
.quote-card blockquote { font-size: 15.5px; color: var(--text); }
.quote-card figcaption { margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line); }
.quote-card figcaption strong { display: block; font-size: 14px; }
.quote-card figcaption span { font-size: 13px; color: var(--text-dim); }

/* ---------- 价格 ---------- */
.billing-toggle {
  display: inline-flex;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 4px;
  margin-bottom: 40px;
}
.billing-toggle button {
  border: none; background: transparent; color: var(--text-dim);
  font: inherit; font-size: 14px;
  padding: 8px 22px; border-radius: 999px; cursor: pointer;
  transition: background-color .18s ease, color .18s ease;
}
.billing-toggle button.is-active { background: var(--accent); color: #04251a; font-weight: 700; }
.save-tag {
  font-size: 11px; padding: 1px 8px; border-radius: 999px;
  border: 1px solid rgba(61, 252, 159, 0.4); color: var(--accent);
  margin-left: 6px;
}
.billing-toggle button.is-active .save-tag { border-color: rgba(4, 37, 26, 0.35); color: #04251a; }

.price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; align-items: stretch; }
.price-card {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 26px;
  background: var(--bg-2);
  display: flex; flex-direction: column;
}
.price-card.is-featured {
  border-color: rgba(61, 252, 159, 0.5);
  box-shadow: 0 0 40px rgba(61, 252, 159, 0.10);
}
.price-flag { position: absolute; top: -12px; left: 26px; }
.price-card h3 { font-size: 18px; }
.price-line { margin: 14px 0 6px; display: flex; align-items: baseline; gap: 6px; }
.price { font-size: 40px; font-weight: 800; color: var(--accent); letter-spacing: 0; transition: opacity .15s ease; }
.price.is-flip { opacity: 0; }
.per { font-size: 14px; color: var(--text-dim); }
.price-desc { font-size: 13.5px; color: var(--text-dim); margin-bottom: 18px; }
.price-card ul { flex: 1; margin-bottom: 22px; }
.price-card li {
  font-size: 14px; color: var(--text);
  padding: 8px 0 8px 24px;
  border-bottom: 1px dashed var(--line);
  position: relative;
}
.price-card li:last-child { border-bottom: none; }
.price-card li::before {
  content: ""; position: absolute; left: 4px; top: 14px;
  width: 9px; height: 5px;
  border: 1.6px solid var(--accent); border-top: none; border-right: none;
  transform: rotate(-45deg);
}

/* ---------- FAQ ---------- */
.faq-list { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-q {
  width: 100%;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  background: none; border: none;
  color: var(--text); font: inherit; font-size: 16.5px; font-weight: 600;
  text-align: left;
  padding: 22px 4px;
  cursor: pointer;
  transition: color .18s ease;
}
.faq-q:hover { color: var(--accent); }
.faq-q i {
  flex: none; width: 12px; height: 12px;
  border-right: 2px solid currentColor; border-bottom: 2px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  transition: transform .22s ease;
}
.faq-q[aria-expanded="true"] { color: var(--accent); }
.faq-q[aria-expanded="true"] i { transform: rotate(-135deg) translateY(-2px); }
.faq-a {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .25s ease;
}
.faq-a.is-open { grid-template-rows: 1fr; }
.faq-a p {
  overflow: hidden;
  color: var(--text-dim); font-size: 15px;
  padding: 0 4px;
  max-width: 680px;
}
.faq-a.is-open p { padding-bottom: 22px; }

/* ---------- 结尾 CTA ---------- */
.cta-band {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--bg-2);
  padding: 72px 0;
  position: relative; z-index: 1;
}
.cta-inner { text-align: center; }
.cta-inner h2 { font-size: clamp(26px, 4vw, 38px); }
.cta-inner p { color: var(--text-dim); margin: 14px auto 28px; }

/* ---------- 页脚 ---------- */
.site-footer { padding: 64px 0 24px; position: relative; z-index: 1; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
}
.footer-brand p { color: var(--text-dim); font-size: 14px; margin-top: 14px; }
.footer-title { font-size: 14px; font-weight: 700; margin-bottom: 12px; }
.site-footer a, .site-footer .link-btn { display: block; color: var(--text-dim); font-size: 14px; padding: 4px 0; }
.site-footer a:hover, .site-footer .link-btn:hover { color: var(--accent); }
.footer-bottom { padding-top: 20px; }
.footer-bottom p { color: var(--text-dim); font-size: 13px; opacity: .7; }

/* ---------- 演示预约弹窗 ---------- */
.modal { position: fixed; inset: 0; z-index: 100; display: flex; align-items: center; justify-content: center; padding: 20px; }
.modal[hidden] { display: none; }
.modal-backdrop {
  position: absolute; inset: 0;
  background: rgba(3, 8, 18, 0.75);
  backdrop-filter: blur(4px);
}
.modal-panel {
  position: relative;
  width: min(440px, 100%);
  max-height: calc(100vh - 40px);
  overflow-y: auto;
  background: var(--bg-2);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 32px 30px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5), 0 0 50px rgba(61, 252, 159, 0.07);
  animation: pop .22s ease;
}
@keyframes pop { from { opacity: 0; transform: translateY(14px) scale(.98); } to { opacity: 1; transform: none; } }
.modal-x {
  position: absolute; top: 14px; right: 14px;
  background: none; border: 1px solid var(--line);
  color: var(--text-dim); border-radius: 8px;
  width: 32px; height: 32px; cursor: pointer; font-size: 13px;
  transition: color .18s ease, border-color .18s ease;
}
.modal-x:hover { color: var(--accent); border-color: var(--accent); }
.modal-panel h3 { font-size: 22px; }
.modal-sub { color: var(--text-dim); font-size: 14px; margin: 8px 0 22px; }
.contact-panel { text-align: center; padding: 8px 0 4px; }
.contact-panel .modal-sub { margin-bottom: 14px; }
.contact-wechat { font-size: 15px; color: var(--text-dim); margin: 0 0 26px; }
.contact-wechat b {
  display: inline-block; margin-left: 6px;
  font-size: 20px; font-weight: 800; color: var(--accent);
  letter-spacing: 0.02em;
}

/* ---------- 功能一览 Tab ---------- */
.tabs {
  display: flex; flex-wrap: wrap; gap: 10px;
  justify-content: center;
  margin-bottom: 26px;
}
.tab {
  font: inherit; font-size: 15px; cursor: pointer;
  color: var(--text-dim);
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 9px 20px;
  transition: color .2s ease, border-color .2s ease, background .2s ease;
}
.tab:hover { color: var(--text); border-color: var(--line-strong); }
.tab.is-active {
  color: #04140c; font-weight: 600;
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: var(--accent-glow);
}
.tab-stage {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-2);
  padding: 32px 30px;
}
.tab-copy { margin-bottom: 22px; }
.tab-copy h3 { font-size: clamp(20px, 3vw, 26px); }
.tab-copy p { color: var(--text-dim); margin-top: 10px; font-size: 15px; max-width: 640px; }
.feat-chips { list-style: none; display: flex; flex-wrap: wrap; gap: 10px; }
.feat-chips li {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 14px;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 14px;
}
.feat-chips li::before {
  content: ""; width: 8px; height: 8px; border-radius: 50%; flex: 0 0 auto;
}
.feat-chips li.ok::before { background: var(--accent); box-shadow: 0 0 8px rgba(61,252,159,.6); }
.feat-chips li.wip { color: var(--text-dim); }
.feat-chips li.wip::before { background: #f2b34b; }
.tab-source { text-align: center; margin-top: 20px; }
.tab-source a { color: var(--accent); text-decoration: none; font-size: 14.5px; }
.tab-source a:hover { text-decoration: underline; }
@media (max-width: 600px) {
  .tab-stage { padding: 24px 18px; }
  .tab { font-size: 14px; padding: 8px 15px; }
}

/* ---------- 入场动效（克制） ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .5s ease, transform .5s ease; }
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .modal-panel { animation: none; }
}

/* ---------- 锚点定位偏移 ---------- */
section[id] { scroll-margin-top: 76px; }

/* ---------- 响应式 ---------- */
@media (max-width: 1020px) {
  .app-body { grid-template-columns: 1fr 240px; }
  .app-side { display: none; }
}

@media (max-width: 860px) {
  .feature-grid, .quote-grid, .price-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .app-body { grid-template-columns: 1fr; }
  .app-progress { border-left: none; border-top: 1px solid var(--line); }
  .hero { padding: 64px 0 48px; }
  .hero-stats > div { border-right: none; padding: 8px 16px; }
  .section { padding: 64px 0; }
}

@media (max-width: 700px) {
  .header-inner {
    flex-wrap: wrap;
    height: auto;
    padding: 12px 0;
    gap: 12px;
  }
  .site-nav {
    order: 3;
    width: 100%;
    gap: 20px;
    overflow-x: auto;
    padding-bottom: 4px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .site-nav::-webkit-scrollbar { display: none; }
  .site-nav a { white-space: nowrap; }
  section[id] { scroll-margin-top: 120px; }
}

/* ---------- 对信专属组件 ---------- */
.brand-sub {
  font-size: 12px; color: var(--text-dim); letter-spacing: 0.14em;
  align-self: flex-end; margin-bottom: 4px;
}

.post-mark {
  width: 34px; height: 34px; flex: none; border-radius: 9px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 700; color: #06121f;
  background: var(--a, #5b8def);
}

.chip-row { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  font-size: 12px; color: var(--text-dim);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 3px 10px;
}
.chip-lg { font-size: 13.5px; padding: 6px 16px; color: var(--text); }

.device-strip {
  margin-top: 28px;
  display: flex; align-items: center; flex-wrap: wrap; gap: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 22px;
  background: var(--bg-2);
}
.device-strip-label {
  font-size: 14px; font-weight: 700; color: var(--accent);
  margin-right: 8px;
}

.circle-item {
  display: flex; align-items: center; gap: 8px;
  font-size: 13.5px; padding: 7px 0;
  border-bottom: 1px dashed var(--line);
}
.circle-item b { margin-left: auto; color: var(--accent); font-weight: 700; font-size: 12.5px; }
.dotlive { width: 8px; height: 8px; border-radius: 50%; background: var(--a, #3dfc9f); flex: none; }

.tech-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.tech-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
  background: var(--bg-2);
  transition: border-color .2s ease;
}
.tech-card:hover { border-color: rgba(61, 252, 159, 0.45); }
.tech-label { font-size: 12px; color: var(--text-dim); letter-spacing: 0.1em; }
.tech-name { font-size: 16.5px; font-weight: 700; margin-top: 6px; color: var(--accent); }

.price-note {
  text-align: center; margin-top: 28px;
  font-size: 13.5px; color: var(--text-dim);
}

.footer-meta { font-size: 13px; color: var(--text-dim); padding: 2px 0; }

@media (max-width: 1020px) {
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 860px) {
  .tech-grid { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
  .device-strip { padding: 14px 16px; }
}

/* ---------- 核心功能：多圈 / IM 双栏（文字左、手机图右） ---------- */
.feature-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-bottom: 20px;
}
.feature-col {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 28px;
  align-items: center;
}
.feature-big {
  border-color: rgba(61, 252, 159, 0.35);
  padding: 34px 30px;
}
.feature-big h3 { font-size: 24px; }
.feature-big p { margin-top: 10px; }
.feature-list { margin-top: 18px; border-top: 1px dashed var(--line); padding-top: 14px; }
.feature-list li {
  font-size: 14px; color: var(--text);
  padding: 6px 0 6px 24px;
  position: relative;
}
.feature-list li::before {
  content: ""; position: absolute; left: 4px; top: 12px;
  width: 9px; height: 5px;
  border: 1.6px solid var(--accent); border-top: none; border-right: none;
  transform: rotate(-45deg);
}
@media (max-width: 860px) {
  .feature-col { grid-template-columns: 1fr; }
  .phone { margin-top: 4px; }
}

/* ---------- 手机界面示意图（独立于功能卡片外） ---------- */
.phone {
  width: 258px;
  margin: 0 auto;
  border: 1px solid var(--line-strong);
  border-radius: 28px;
  background: var(--bg);
  box-shadow: 0 18px 46px rgba(2, 8, 20, 0.6), 0 0 28px rgba(61, 252, 159, 0.07);
  padding: 14px 14px 14px;
  font-size: 11px;
}
.phone-cam {
  width: 56px; height: 5px; border-radius: 999px;
  background: rgba(140, 175, 230, 0.18);
  margin: 4px auto 10px;
}
.phone-bar {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 10px; padding: 0 2px;
}
.phone-title { font-size: 13px; font-weight: 700; }
.phone-mini { color: var(--text-dim); font-size: 10px; border: 1px solid var(--line); border-radius: 999px; padding: 1px 8px; }
.phone-chips { display: flex; gap: 6px; margin-bottom: 10px; flex-wrap: wrap; }
.p-chip {
  font-size: 10px; color: var(--text-dim);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 1px 8px;
}
.p-chip.is-on { color: #04251a; background: var(--accent); border-color: var(--accent); font-weight: 700; }
.p-row {
  display: flex; align-items: center; gap: 8px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  padding: 9px 11px;
  margin-bottom: 8px;
}
.p-avatar {
  width: 30px; height: 30px; flex: none; border-radius: 9px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; color: #06121f;
  background: var(--a, #5b8def);
}
.p-mid { flex: 1; min-width: 0; }
.p-mid strong { display: block; font-size: 11px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.p-mid small { display: block; font-size: 9.5px; color: var(--text-dim); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.p-btn {
  flex: none; font-size: 9.5px; font-weight: 700;
  color: #04251a; background: var(--accent);
  border-radius: 999px; padding: 2px 9px;
}
.p-btn.is-joined { background: transparent; color: var(--text-dim); border: 1px solid var(--line-strong); font-weight: 400; }
.p-badge {
  flex: none; min-width: 16px; height: 16px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 999px; background: var(--accent); color: #04251a;
  font-size: 9.5px; font-weight: 800; padding: 0 4px;
}
.p-time { flex: none; color: var(--text-dim); font-size: 9.5px; }
.phone-chat { padding: 4px 2px 6px; }
.bubble {
  display: block; max-width: 86%;
  border-radius: 10px;
  padding: 6px 10px;
  margin-top: 8px;
  font-size: 10px;
  line-height: 1.5;
}
.bubble.in { background: var(--surface); border: 1px solid var(--line); }
.bubble.out {
  margin-left: auto;
  background: var(--accent-dim);
  border: 1px solid rgba(61, 252, 159, 0.35);
  color: var(--text);
}
.phone-tabs {
  display: flex; justify-content: space-around;
  border-top: 1px solid var(--line);
  margin-top: 10px; padding-top: 9px;
  color: var(--text-dim); font-size: 10px;
}
.phone-input {
  display: flex; align-items: center; gap: 8px;
  margin-top: 10px;
}
.phone-input .input-box {
  flex: 1;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text-dim);
  font-size: 9.5px;
  padding: 6px 11px;
}
.phone-input .send-dot {
  width: 20px; height: 20px; flex: none; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px rgba(61, 252, 159, 0.4);
  position: relative;
}
.phone-input .send-dot::after {
  content: ""; position: absolute;
  left: 7px; top: 6px; width: 6px; height: 6px;
  border: 1.5px solid #04251a; border-left: none; border-bottom: none;
  transform: rotate(45deg);
}
.phone-tabs .is-on { color: var(--accent); font-weight: 700; }

/* ---------- 下载统计 ---------- */
.dl-stats { margin-top: 18px; font-size: 13.5px; color: var(--text-dim); }
.dl-stats b { color: var(--accent); font-size: 15px; font-weight: 800; }