/* Site 4 — Bold band layout */
:root {
  --teal: #128c7e;
  --red: #e63946;
  --navy: #1d3557;
  --ice: #f1faee;
  --white: #ffffff;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Arial", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--navy);
  background: var(--white);
  line-height: 1.7;
}

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

.band {
  padding: 64px 0;
}

.inner {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
}

.head {
  background: var(--navy);
  color: #fff;
}

.head-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 16px;
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 18px;
}

.wordmark svg {
  width: 28px;
  height: 28px;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 16px;
  font-size: 13px;
  font-weight: 700;
}

.links a:hover {
  color: #a8dadc;
}

.hero {
  background: var(--teal);
  color: #fff;
  padding: 56px 0 48px;
}

.hero h1 {
  font-size: clamp(30px, 4.6vw, 50px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  max-width: 920px;
  margin-bottom: 16px;
}

.hero p {
  max-width: 700px;
  margin-bottom: 10px;
  font-size: 17px;
}

.punch {
  display: inline-block;
  margin: 16px 0 28px;
  background: var(--red);
  color: #fff;
  font-weight: 800;
  padding: 14px 26px;
  text-transform: none;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.stat {
  background: rgba(0, 0, 0, 0.18);
  padding: 16px 14px;
  border-top: 4px solid #fff;
}

.stat b {
  display: block;
  font-size: 22px;
  margin-bottom: 4px;
}

.stat span {
  font-size: 13px;
  opacity: 0.9;
}

.browser-strip {
  background: var(--ice);
  padding: 28px 0;
  border-bottom: 6px solid var(--red);
}

.strip-title {
  font-size: 22px;
  margin-bottom: 10px;
}

.strip-flex {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  align-items: center;
}

.tag {
  background: var(--navy);
  color: #fff;
  font-weight: 800;
  font-size: 12px;
  padding: 7px 12px;
}

.strip-note {
  flex: 1 1 280px;
  font-size: 14.5px;
}

h2 {
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.3;
  margin-bottom: 12px;
}

.muted {
  color: #35506e;
  margin-bottom: 22px;
  max-width: 720px;
}

.icons-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.ico-box {
  border: 2px solid var(--navy);
  padding: 18px 16px;
}

.ico-box svg {
  width: 28px;
  height: 28px;
  margin-bottom: 10px;
}

.ico-box h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.ico-box p {
  font-size: 14px;
  color: #35506e;
}

.files-band {
  background: var(--navy);
  color: #f1faee;
}

.files-band h2 {
  color: #fff;
}

.files-band .muted {
  color: #b7c7d9;
}

.files-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.files-2 article {
  background: rgba(255, 255, 255, 0.06);
  padding: 20px;
  border-left: 5px solid var(--red);
}

.files-2 h3 {
  margin-bottom: 8px;
}

.chat-band {
  background: #fff;
}

.chat-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 14px;
}

.chat-3 article {
  background: var(--ice);
  padding: 18px;
}

.chat-3 h3 {
  margin-bottom: 8px;
}

/* Zigzag steps */
.steps-band {
  background: var(--ice);
}

.zig {
  display: grid;
  gap: 18px;
}

.zig article {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 16px;
  width: min(720px, 100%);
  background: #fff;
  border: 2px solid var(--navy);
  padding: 16px 18px;
}

.zig article:nth-child(even) {
  margin-left: auto;
  border-color: var(--teal);
}

.zig .no {
  font-size: 40px;
  font-weight: 900;
  color: var(--red);
  line-height: 1;
}

.sec-band {
  background: var(--teal);
  color: #fff;
}

.sec-band h2 {
  color: #fff;
}

.sec-band .muted {
  color: #d7f3ee;
}

.sec-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 12px;
}

.sec-3 article {
  background: rgba(0, 0, 0, 0.14);
  padding: 18px;
}

.cmp {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.cmp > div {
  padding: 24px;
}

.cmp .left {
  background: var(--navy);
  color: #fff;
}

.cmp .right {
  background: var(--ice);
}

.cmp h3 {
  margin-bottom: 10px;
}

.cmp ul {
  padding-left: 18px;
}

.bound {
  margin-top: 18px;
  padding: 16px;
  border: 2px dashed var(--red);
}

.faq-band ol {
  list-style: none;
  counter-reset: q;
}

.faq-band li {
  counter-increment: q;
  padding: 16px 0 16px 48px;
  border-bottom: 2px solid #e4ece8;
  position: relative;
}

.faq-band li::before {
  content: counter(q, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 16px;
  font-weight: 900;
  color: var(--red);
}

.faq-band strong {
  display: block;
  margin-bottom: 6px;
}

.base {
  background: var(--navy);
  color: #c5d4e4;
  padding: 32px 0;
  font-size: 14px;
}

.base p + p {
  margin-top: 10px;
}

@media (max-width: 860px) {
  .links {
    display: none;
  }

  .stats,
  .icons-4,
  .files-2,
  .chat-3,
  .sec-3,
  .cmp {
    grid-template-columns: 1fr;
  }

  .zig article:nth-child(even) {
    margin-left: 0;
  }
}

.news-band { background: #1d3557; color: #fff; padding: 48px 0; }
.news-band h2, .news-band p { color: #fff; }
.news-grid { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 20px; }
.news-grid li { background: rgba(255,255,255,0.08); padding: 16px; }
.news-grid time { color: #e63946; font-size: 12px; font-weight: 700; }
.news-grid h3 { font-size: 16px; margin-bottom: 8px; }
@media (max-width: 800px) { .news-grid { grid-template-columns: 1fr; } }