:root {
  --wa-deep: #075E54;
  --wa-teal: #128C7E;
  --wa-mint: #DCF8C6;
  --wa-sand: #ECE5DD;
  --wa-ink: #111B21;
  --wa-muted: #54656F;
  --wa-card: #ffffff;
  --wa-line: #d1d7db;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--wa-ink);
  background: var(--wa-sand);
  line-height: 1.7;
}

a { color: inherit; text-decoration: none; }

img, svg { display: block; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  width: 100%;
  background: var(--wa-deep);
  color: #fff;
  box-shadow: 0 2px 10px rgba(7, 94, 84, 0.25);
}

.topbar-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.02em;
}

.brand svg { flex-shrink: 0; }

nav { display: flex; flex-wrap: wrap; gap: 8px 18px; }

nav a {
  color: #e7fffa;
  font-size: 14px;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
}

nav a:hover { border-bottom-color: #25D366; }

.hero {
  max-width: 1120px;
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-copy h1 {
  font-size: 34px;
  line-height: 1.35;
  color: var(--wa-deep);
  margin-bottom: 16px;
}

.hero-copy p {
  font-size: 16px;
  color: var(--wa-muted);
  margin-bottom: 24px;
  max-width: 36em;
}

.cta {
  display: inline-block;
  background: var(--wa-teal);
  color: #fff;
  font-weight: 700;
  padding: 12px 26px;
  border-radius: 24px;
  box-shadow: 0 8px 18px rgba(18, 140, 126, 0.28);
}

.cta:hover { background: var(--wa-deep); }

.sync-deck {
  position: relative;
  min-height: 340px;
}

.deck-card {
  position: absolute;
  width: 260px;
  background: var(--wa-card);
  border-radius: 16px;
  padding: 16px 18px;
  box-shadow: 0 16px 36px rgba(17, 27, 33, 0.14);
}

.deck-card header {
  font-size: 13px;
  font-weight: 700;
  color: var(--wa-deep);
  margin-bottom: 12px;
}

.deck-chat {
  left: 8px;
  top: 36px;
  z-index: 1;
  transform: rotate(-7deg);
  background: #fff;
}

.deck-unread {
  right: 18px;
  top: 0;
  z-index: 3;
  transform: rotate(5deg);
  background: var(--wa-mint);
}

.deck-group {
  right: 40px;
  bottom: 8px;
  z-index: 2;
  transform: rotate(-2deg);
}

.deck-chat ul { list-style: none; }

.deck-chat li {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.ava {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  flex-shrink: 0;
}

.a1 { background: #128C7E; }
.a2 { background: #075E54; }
.a3 { background: #34B7F1; }

.line {
  height: 8px;
  border-radius: 8px;
  background: #e9edef;
  flex: 1;
}

.w8 { max-width: 72%; }
.w6 { max-width: 54%; }
.w7 { max-width: 64%; }

.time { font-size: 11px; color: #8696a0; }

.badge {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--wa-deep);
  color: #fff;
  font-size: 22px;
  font-weight: 700;
  display: grid;
  place-items: center;
  margin: 8px 0 10px;
}

.deck-card p { font-size: 13px; color: var(--wa-muted); }

.faces { display: flex; margin: 8px 0 10px; }

.faces .ava { margin-left: -6px; border: 2px solid #fff; }
.faces .ava:first-child { margin-left: 0; }

.block {
  max-width: 1120px;
  margin: 0 auto;
  padding: 36px 24px;
}

.block h2 {
  font-size: 26px;
  color: var(--wa-deep);
  margin-bottom: 12px;
}

.block > p {
  color: var(--wa-muted);
  margin-bottom: 22px;
  max-width: 48em;
}

.feat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.feat-grid.four { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--wa-card);
  border-radius: 16px;
  padding: 20px 18px 22px;
  box-shadow: 0 8px 20px rgba(7, 94, 84, 0.06);
}

.card h3 {
  font-size: 17px;
  margin: 10px 0 8px;
  color: var(--wa-deep);
}

.card p { font-size: 14px; color: var(--wa-muted); }

.ico {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--wa-mint);
  color: var(--wa-teal);
  display: grid;
  place-items: center;
}

.ico svg { width: 22px; height: 22px; }

.plain { list-style: none; display: grid; gap: 14px; }

.plain li {
  background: var(--wa-card);
  border-radius: 16px;
  padding: 16px 18px;
  border-left: 6px solid var(--wa-teal);
}

.plain strong { color: var(--wa-deep); display: block; margin-bottom: 6px; }

.plain p { color: var(--wa-muted); font-size: 14px; }

.table-wrap {
  overflow-x: auto;
  background: var(--wa-card);
  border-radius: 16px;
  box-shadow: 0 8px 20px rgba(7, 94, 84, 0.06);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
  font-size: 14px;
}

th, td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--wa-line);
  vertical-align: top;
}

th {
  background: var(--wa-deep);
  color: #fff;
  font-weight: 600;
}

tr:nth-child(even) td { background: #f6f8f7; }

.step-bar {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  position: relative;
  padding-top: 8px;
}

.step-bar::before {
  content: "";
  position: absolute;
  left: 8%;
  right: 8%;
  top: 28px;
  height: 3px;
  background: linear-gradient(90deg, var(--wa-teal), var(--wa-mint));
}

.step-bar li {
  position: relative;
  background: var(--wa-card);
  border-radius: 16px;
  padding: 20px 16px 18px;
  text-align: center;
}

.step-bar .dot {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  margin: 0 auto 12px;
  border-radius: 50%;
  background: var(--wa-teal);
  color: #fff;
  font-weight: 700;
  position: relative;
  z-index: 1;
  box-shadow: 0 0 0 6px var(--wa-sand);
}

.step-bar h3 { font-size: 16px; color: var(--wa-deep); margin-bottom: 8px; }

.step-bar p { font-size: 13px; color: var(--wa-muted); text-align: left; }

.faq-list details {
  background: var(--wa-card);
  border-radius: 12px;
  margin-bottom: 10px;
  padding: 4px 16px;
  border: 1px solid var(--wa-line);
}

.faq-list summary {
  cursor: pointer;
  font-weight: 700;
  padding: 12px 0;
  color: var(--wa-deep);
}

.faq-list details p {
  padding-bottom: 14px;
  color: var(--wa-muted);
  font-size: 14px;
}

.site-foot {
  background: var(--wa-deep);
  color: #dceeea;
  margin-top: 20px;
}

.foot-grid {
  max-width: 1120px;
  margin: 0 auto;
  padding: 36px 24px 40px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.site-foot h3 {
  color: #fff;
  font-size: 15px;
  margin-bottom: 8px;
}

.site-foot p { font-size: 13px; line-height: 1.7; }

@media (max-width: 960px) {
  .hero { grid-template-columns: 1fr; }
  .sync-deck { min-height: 300px; }
  .feat-grid,
  .feat-grid.four,
  .step-bar,
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .step-bar::before { display: none; }
}

@media (max-width: 640px) {
  .hero-copy h1 { font-size: 26px; }
  .feat-grid,
  .feat-grid.four,
  .step-bar,
  .foot-grid { grid-template-columns: 1fr; }
  .topbar-inner { flex-direction: column; align-items: flex-start; }
  .deck-card { position: relative; transform: none; width: 100%; margin-bottom: 12px; }
  .sync-deck { min-height: 0; }
}

#news .news-list { display: grid; gap: 0; border-top: 2px solid #075E54; }
#news article { display: grid; grid-template-columns: 110px 1fr; gap: 8px 20px; padding: 18px 0; border-bottom: 1px solid #d9d2c9; }
#news h3 { grid-column: 2; margin: 0; font-size: 17px; color: #075E54; }
#news time { grid-row: 1 / span 2; color: #128C7E; font-size: 13px; padding-top: 4px; }
#news p { grid-column: 2; margin: 0; font-size: 14px; color: #3d4a46; }
@media (max-width: 640px) { #news article { grid-template-columns: 1fr; } #news time { grid-row: auto; } }