* { box-sizing: border-box; }
html, body { margin: 0; background: #f5f2f0; }
img { max-width: 100%; height: auto; display: block; }
.page {
  --red: #c21d1f;
  --deep: #9f1212;
  --ink: #1f1f1f;
  --muted: #555;
  --pink: #f5e3e3;
  --card: #fff;
  --shadow: 0 4px 16px rgba(80, 20, 20, .08);
  width: 100%;
  min-height: 100vh;
  overflow-x: hidden;
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #f5f2f0;
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap;
}
.share-thumbnail {
  position: absolute; top: 0; left: -10000px; width: 300px; height: 300px; pointer-events: none;
}

.hero { width: 100%; background: #0b121c; line-height: 0; }
.hero img,
.top-block { width: 100%; vertical-align: top; display: block; }

.section {
  width: min(100%, 750px);
  margin: 0 auto;
  padding: 0 5.5% 8px;
}
.section-header {
  display: flex; align-items: center; min-height: 48px; margin: 28px 0 16px; padding: 6px 16px;
  color: #fff; font-size: 22px; font-weight: 900; letter-spacing: 1px;
  background: linear-gradient(90deg, #b51416 0%, #c8261b 42%, rgba(214, 90, 80, .7) 72%, rgba(255,255,255,0) 100%);
}
.subhead {
  display: flex; align-items: center; gap: 10px; margin: 8px 0 14px;
  color: var(--red); font-size: 18px; font-weight: 900;
}
.subhead::before { width: 5px; height: 18px; content: ""; background: var(--red); }

.prose p {
  margin: 0 0 12px; color: var(--ink); font-size: 15px; line-height: 1.9;
  text-align: justify; text-indent: 2em;
}
.prose strong { color: var(--red); font-weight: 800; }

.criteria-list { display: grid; gap: 12px; }
.criteria-list article {
  padding: 14px 14px 12px; background: var(--card); border-radius: 10px; box-shadow: var(--shadow);
}
.criteria-list h3 {
  display: flex; align-items: center; gap: 8px; margin: 0 0 8px;
  color: var(--ink); font-size: 16px; font-weight: 800;
}
.criteria-list h3 i {
  flex: none; width: 18px; height: 18px; border: 2px solid var(--red); border-radius: 50%;
  background:
    radial-gradient(circle at center, var(--red) 0 28%, transparent 30% 48%, var(--red) 50% 58%, transparent 60%);
}
.criteria-list ul { margin: 0 0 10px; padding-left: 1.1em; }
.criteria-list li { margin: 0 0 6px; color: var(--muted); font-size: 13px; line-height: 1.75; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tags span {
  padding: 2px 8px; color: var(--deep); font-size: 12px; background: var(--pink); border-radius: 999px;
}

.brand-grid-img {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 0 8px;
}

.case {
  margin: 0 0 18px; padding: 14px; background: #fff; border-radius: 12px; box-shadow: var(--shadow);
}
.case h3 {
  position: relative; margin: 0 0 12px; color: var(--red); font-size: 16px; font-weight: 800;
}
.benefit {
  margin: 0 0 0; padding: 18px 0 20px;
  background: transparent; border: 0; border-radius: 0; box-shadow: none;
  border-bottom: 1px solid #ebe4e0;
}
.benefit:last-child { border-bottom: 0; padding-bottom: 8px; }
.benefit.benefit-text { padding-bottom: 28px; }
.case > h3 {
  margin-bottom: 12px; padding-bottom: 10px; border-bottom: 1px dashed #e4d2cc;
}
.case h3 b {
  position: absolute; right: 0; top: -2px; color: #e2d6d3; font-size: 28px; font-weight: 900; line-height: 1;
}
.case .banner {
  width: 100%; margin-bottom: 8px; border-radius: 4px; background: #0b1c3a;
}
.cols {
  display: grid; gap: 8px; align-items: stretch;
}
.cols.asymmetric { grid-template-columns: 2.4fr 1fr; }
.cols .col {
  display: flex; flex-direction: column; gap: 8px; min-width: 0;
}
.cols .col img {
  width: 100%; border-radius: 4px; display: block;
}
/* 左栏横图按原始比例撑开高度 */
.cols.asymmetric .col:not(.phones) img {
  height: auto; flex: none;
}
/* 右栏竖图铺满左栏总高，底边对齐 */
.cols.asymmetric .col.phones img {
  flex: 1 1 0; min-height: 0; height: 0; object-fit: cover;
}
.benefit h3 {
  display: flex; align-items: center; gap: 8px;
  margin: 0 0 10px; color: var(--ink); font-size: 18px; font-weight: 800; line-height: 1.3;
}
.benefit h3 i {
  position: relative; flex: none; width: 26px; height: 18px;
  background: var(--red); border-radius: 1px;
}
.benefit h3 i::before,
.benefit h3 i::after {
  content: ""; position: absolute; top: 4px;
  width: 0; height: 0;
  border-top: 5px solid transparent; border-bottom: 5px solid transparent;
  border-left: 7px solid #fff;
}
.benefit h3 i::before { left: 5px; }
.benefit h3 i::after { left: 13px; }
.benefit h3 em { color: var(--deep); font-style: normal; font-weight: 800; }
.benefit p {
  margin: 0 0 14px; color: var(--ink); font-size: 14px; line-height: 1.75;
}
.benefit-visual {
  display: block; width: 100%; margin: 0; height: auto; border-radius: 0;
}
.benefit-visual.device {
  width: min(100%, 560px); margin: 0 auto;
}
.web-promo {
  display: flex; flex-direction: column; align-items: center; gap: 0;
  margin: 0 -2%;
}
.web-promo .web-device {
  display: block; width: 100%; max-width: 720px; height: auto;
}

.grid { display: grid; gap: 8px; }
.grid.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid.posters { margin-top: 8px; }
.grid img, .wide { width: 100%; border-radius: 4px; }
.wide { margin-top: 8px; }

.mosaic {
  display: grid;
  grid-template-columns: 1.85fr 1fr;
  grid-template-areas:
    "big tall"
    "bot bot";
  gap: 8px;
  align-items: stretch;
}
.mosaic .big { grid-area: big; width: 100%; height: 100%; object-fit: cover; border-radius: 4px; }
.mosaic .tall { grid-area: tall; width: 100%; height: 100%; object-fit: cover; border-radius: 4px; }
.mosaic .bot {
  grid-area: bot;
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px;
}
.mosaic .bot img { width: 100%; height: auto; border-radius: 4px; object-fit: cover; aspect-ratio: 16 / 10; }
.posters img { aspect-ratio: 9 / 16; object-fit: cover; }

.contact { text-align: center; }
.contact-phone { margin: 8px 0 10px; color: var(--ink); font-size: 17px; }
.contact-phone strong, .contact-phone a { color: var(--red); text-decoration: none; font-weight: 800; }
.contact-org { margin: 0 0 8px; color: var(--red); font-size: 16px; font-weight: 800; }

.application-title {
  display: flex; align-items: center; justify-content: center; gap: 10px; margin: 22px 0 16px;
  color: var(--ink); font-size: 20px; font-weight: 800;
}
.application-title::before, .application-title::after {
  width: 48px; height: 1px; content: ""; background: var(--red);
}
.application-title span::before, .application-title span::after {
  margin: 0 8px; color: var(--red); font-size: 11px; content: "◆";
}
.form { display: grid; gap: 14px; padding-bottom: 40px; }
.form label { display: grid; gap: 8px; color: var(--ink); font-size: 14px; }
.form label > span::before { color: var(--red); content: "*"; }
.form input {
  width: 100%; min-height: 40px; padding: 8px 12px; color: var(--ink); font-size: 14px;
  background: #fff; border: 1px solid #cfcfcf;
}
.form input::placeholder { color: #b5b5b5; }
.form button {
  min-height: 46px; margin-top: 4px; color: #fff; font-size: 16px; font-weight: 800; letter-spacing: 2px;
  background: linear-gradient(90deg, #c8261b, #a81414); border: 0; border-radius: 4px;
}
.form-status { min-height: 20px; margin: 0; color: var(--red); font-size: 13px; text-align: center; }
.honeypot { position: absolute; left: -10000px; opacity: 0; pointer-events: none; }

@media (max-width: 420px) {
  .section-header { font-size: 19px; min-height: 42px; }
  .prose p { font-size: 13.5px; }
  .criteria-list h3 { font-size: 15px; }
  .criteria-list li { font-size: 12px; }
  .grid.g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; }
  .posters { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 6px; }
  .case h3 b { font-size: 22px; }
  .cols.asymmetric { grid-template-columns: 2.3fr 1fr; gap: 6px; }
  .cols .col { gap: 6px; }
  .mosaic { grid-template-columns: 1.7fr 1fr; gap: 6px; }
  .mosaic .bot { gap: 6px; }
  .grid.display-bot { grid-template-columns: 1.55fr 1fr; gap: 6px; }
  .device, .ip-pair-img { width: 100%; }
  .web-promo .logo-strip { width: 100%; }
}