.page-products {
  --pp-cut: 12px;
  --pp-paper-ink: #14181F;
  background-image: radial-gradient(60% 40% at 78% 0%, rgba(23, 162, 255, .10), transparent 70%);
  background-repeat: no-repeat;
}

/* ---------- 面包屑 ---------- */
.page-products .feat-crumb {
  padding: 22px 0 0;
}

.page-products .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--haze);
}

.page-products .breadcrumb a {
  color: var(--haze);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-products .breadcrumb a:hover,
.page-products .breadcrumb a:focus-visible {
  color: var(--blue);
}

.page-products .breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: rgba(138, 147, 166, .5);
}

/* ---------- 首屏框景 ---------- */
.page-products .feat-hero {
  padding: 28px 0 56px;
}

.page-products .feat-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding: 24px 20px 28px;
  border: 1px solid var(--hairline);
  border-radius: 2px;
  background: linear-gradient(160deg, rgba(15, 21, 34, .78), rgba(7, 9, 15, .35) 62%);
}

.page-products .feat-hero__inner::before,
.page-products .feat-hero__inner::after {
  content: "";
  position: absolute;
  width: 26px;
  height: 26px;
  pointer-events: none;
}

.page-products .feat-hero__inner::before {
  top: -1px;
  left: -1px;
  border-top: 2px solid var(--blue);
  border-left: 2px solid var(--blue);
}

.page-products .feat-hero__inner::after {
  right: -1px;
  bottom: -1px;
  border-right: 2px solid var(--orange);
  border-bottom: 2px solid var(--orange);
}

.page-products .feat-hero__copy .eyebrow {
  color: var(--haze);
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .12em;
  margin: 0;
}

.page-products .feat-hero__copy h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.85rem, 6vw, 3.3rem);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-products .feat-hero__lead {
  margin: 18px 0 0;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--haze);
}

.page-products .feat-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-products .feat-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 28px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--hairline);
}

.page-products .feat-hero__stats .metric-value {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(1.3rem, 5vw, 1.85rem);
  line-height: 1.1;
  letter-spacing: .04em;
  color: var(--paper);
}

.page-products .feat-hero__stats .metric-value--lime {
  color: var(--lime);
}

.page-products .feat-hero__stats .metric-value--orange {
  color: var(--orange);
}

.page-products .feat-hero__stats .metric-label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--haze);
}

/* 首屏右侧数据卡 */
.page-products .feat-hero__panel {
  align-self: start;
  padding: 20px 18px;
  border-radius: 2px;
}

.page-products .feat-hero__panel-head {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--paper);
}

.page-products .feat-hero__panel-head strong {
  font-weight: 600;
  color: var(--lime);
}

.page-products .hero-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(182, 255, 61, .18);
  flex: none;
}

.page-products .hero-feed {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 13px;
}

.page-products .hero-feed li {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding-left: 12px;
  border-left: 1px solid var(--blue-line);
}

.page-products .hero-feed__t {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--blue);
}

.page-products .hero-feed__d {
  font-size: 13px;
  line-height: 1.6;
  color: var(--haze);
}

.page-products .feat-hero__panel .metric-bar {
  height: 4px;
  margin-top: 18px;
  border-radius: 99px;
  background: rgba(23, 162, 255, .16);
  overflow: hidden;
}

.page-products .feat-hero__panel .metric-bar i {
  display: block;
  height: 100%;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--blue), var(--lime));
}

.page-products .feat-hero__panel-note {
  margin: 12px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--haze);
}

/* ---------- 通用区块标题组 ---------- */
.page-products .feat-head {
  max-width: 64ch;
  margin-bottom: 26px;
}

.page-products .feat-head .eyebrow {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--blue);
}

.page-products .feat-head h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 4.6vw, 2.1rem);
  line-height: 1.3;
  letter-spacing: -.005em;
  color: var(--paper);
}

.page-products .feat-head__lead {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--haze);
}

/* ---------- 四条通道总览 ---------- */
.page-products .feat-tracks {
  padding: 8px 0 60px;
}

.page-products .tracklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-products .tracklist__link {
  position: relative;
  display: block;
  padding: 20px 18px 18px;
  text-decoration: none;
  background: linear-gradient(135deg, rgba(23, 162, 255, .13), rgba(15, 21, 34, .55) 58%);
  box-shadow: inset 0 0 0 1px var(--hairline);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: transform .34s var(--ease), box-shadow .34s var(--ease);
}

.page-products .tracklist__link:hover,
.page-products .tracklist__link:focus-visible {
  transform: translateX(6px);
  box-shadow: inset 0 0 0 1px var(--blue-line);
}

.page-products .tracklist__num {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--blue);
}

.page-products .tracklist__title {
  display: block;
  margin: 9px 0 7px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.18rem;
  color: var(--paper);
}

.page-products .tracklist__desc {
  display: block;
  font-size: 14px;
  line-height: 1.72;
  color: var(--haze);
}

.page-products .tracklist__go {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--lime);
}

/* ---------- 深度章节 ---------- */
.page-products .feat-deep {
  position: relative;
  padding: 52px 0;
}

.page-products .feat-deep::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--blue-line), transparent 72%);
}

.page-products .feat-deep__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-products .feat-deep__rail-label {
  margin: 0 0 14px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--haze);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--hairline);
}

.page-products .path-list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  display: grid;
  gap: 18px;
}

.page-products .path-list::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--blue-line), rgba(23, 162, 255, .04));
}

.page-products .path-list li {
  position: relative;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--haze);
}

.page-products .path-list li::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--blue);
}

.page-products .feat-note {
  margin-top: 22px;
  padding: 16px;
  background: rgba(15, 21, 34, .62);
  box-shadow: inset 0 0 0 1px var(--hairline);
  border-radius: 2px;
}

.page-products .feat-note__k {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--orange);
}

.page-products .feat-note p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--haze);
}

.page-products .feat-deep__kicker {
  margin: 0 0 10px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--blue);
}

.page-products .feat-deep__main h2 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 4.4vw, 2rem);
  line-height: 1.3;
  color: var(--paper);
}

.page-products .feat-deep__text {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--haze);
}

.page-products .feat-points {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 13px;
}

.page-products .feat-points li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--haze);
}

.page-products .feat-points li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 9px;
  width: 7px;
  height: 7px;
  background: var(--blue);
  transform: rotate(45deg);
}

.page-products .feat-points strong {
  color: var(--paper);
  font-weight: 600;
}

/* 图像框 */
.page-products .feat-figure {
  margin: 26px 0 0;
  border: 1px solid var(--hairline);
  background: var(--ink-2);
  border-radius: 2px;
  overflow: hidden;
}

.page-products .feat-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-products .feat-figure figcaption {
  padding: 10px 16px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .03em;
  line-height: 1.6;
  color: var(--haze);
  border-top: 1px solid var(--hairline);
}

.page-products .feat-figure--tall {
  margin: 0 0 24px;
}

/* 收藏额度 */
.page-products .fav-meter {
  margin-top: 22px;
  padding: 16px;
  background: rgba(27, 36, 54, .55);
  box-shadow: inset 0 0 0 1px var(--hairline);
  border-radius: 2px;
}

.page-products .fav-meter__head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--haze);
}

.page-products .fav-meter .metric-bar {
  height: 6px;
  border-radius: 99px;
  background: rgba(23, 162, 255, .16);
  overflow: hidden;
}

.page-products .fav-meter .metric-bar i {
  display: block;
  height: 100%;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--blue), var(--orange));
}

.page-products .fav-meter__note {
  margin: 12px 0 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--haze);
}

.page-products .text-orange {
  color: var(--orange);
}

.page-products .text-lime {
  color: var(--lime);
}

/* ---------- V4 专区 ---------- */
.page-products .feat-v4 {
  position: relative;
  padding: 56px 0 60px;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.page-products .feat-v4::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(0deg, rgba(23, 162, 255, .05) 0 1px, transparent 1px 5px);
  pointer-events: none;
}

.page-products .feat-v4 .container {
  position: relative;
  z-index: 1;
}

.page-products .v4-board {
  margin-top: 26px;
}

.page-products .v4-tabs,
.page-products .version-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-products .v4-tabs label {
  cursor: pointer;
  padding: 7px 13px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--haze);
  background: rgba(27, 36, 54, .6);
  border: 1px solid var(--hairline);
  border-radius: 99px;
  transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}

.page-products .v4-tabs label:hover {
  color: var(--paper);
  border-color: var(--blue-line);
}

.page-products #v4dim-all:checked ~ .v4-tabs label[for="v4dim-all"],
.page-products #v4dim-1:checked ~ .v4-tabs label[for="v4dim-1"],
.page-products #v4dim-2:checked ~ .v4-tabs label[for="v4dim-2"],
.page-products #v4dim-3:checked ~ .v4-tabs label[for="v4dim-3"],
.page-products #v4dim-4:checked ~ .v4-tabs label[for="v4dim-4"],
.page-products #v4dim-5:checked ~ .v4-tabs label[for="v4dim-5"],
.page-products #v4dim-6:checked ~ .v4-tabs label[for="v4dim-6"] {
  color: var(--lime);
  background: var(--blue-soft);
  border-color: var(--blue);
}

.page-products .v4-grid {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-products .v4-grid > * {
  padding: 14px 12px;
  border: 1px solid var(--hairline);
  border-top: 2px solid var(--blue-line);
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(27, 36, 54, .78), rgba(15, 21, 34, .5));
  transition: opacity .25s var(--ease), border-color .25s var(--ease);
}

.page-products #v4dim-1:checked ~ .v4-grid > *:not(:nth-child(1)),
.page-products #v4dim-2:checked ~ .v4-grid > *:not(:nth-child(2)),
.page-products #v4dim-3:checked ~ .v4-grid > *:not(:nth-child(3)),
.page-products #v4dim-4:checked ~ .v4-grid > *:not(:nth-child(4)),
.page-products #v4dim-5:checked ~ .v4-grid > *:not(:nth-child(5)),
.page-products #v4dim-6:checked ~ .v4-grid > *:not(:nth-child(6)) {
  opacity: .28;
}

.page-products #v4dim-1:checked ~ .v4-grid > *:nth-child(1),
.page-products #v4dim-2:checked ~ .v4-grid > *:nth-child(2),
.page-products #v4dim-3:checked ~ .v4-grid > *:nth-child(3),
.page-products #v4dim-4:checked ~ .v4-grid > *:nth-child(4),
.page-products #v4dim-5:checked ~ .v4-grid > *:nth-child(5),
.page-products #v4dim-6:checked ~ .v4-grid > *:nth-child(6) {
  border-top-color: var(--orange);
  background: linear-gradient(180deg, rgba(23, 162, 255, .16), rgba(15, 21, 34, .6));
}

.page-products .v4-col h3 {
  margin: 0 0 10px;
  font-family: var(--font-data);
  font-weight: 500;
  font-size: 11.5px;
  letter-spacing: .07em;
  color: var(--lime);
}

.page-products .v4-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 7px;
}

.page-products .v4-col li {
  padding-bottom: 7px;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--haze);
  border-bottom: 1px dashed rgba(138, 147, 166, .18);
}

.page-products .v4-col li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-products .v4-note {
  margin: 16px 0 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .03em;
  line-height: 1.7;
  color: var(--haze);
}

/* ---------- 版本对照（纸色区） ---------- */
.page-products .feat-version {
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(20, 24, 31, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20, 24, 31, .045) 1px, transparent 1px);
  background-size: 26px 26px;
  padding: 56px 0 64px;
  color: var(--ink-text);
}

.page-products .feat-version .feat-head {
  max-width: 62ch;
}

.page-products .feat-version .feat-head .eyebrow {
  color: var(--slate);
}

.page-products .feat-version .feat-head h2 {
  color: var(--ink-text);
}

.page-products .feat-version .feat-head__lead {
  color: var(--slate);
}

.page-products .feat-figure--ver {
  max-width: 320px;
  margin: 0 auto 30px;
  border-color: var(--paper-line);
}

.page-products .version-board {
  margin-top: 4px;
}

.page-products .version-tabs {
  margin-bottom: 16px;
}

.page-products .version-tabs label {
  cursor: pointer;
  padding: 7px 13px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--slate);
  background: rgba(255, 255, 255, .55);
  border: 1px solid var(--paper-line);
  border-radius: 99px;
  transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}

.page-products .version-tabs label:hover {
  border-color: rgba(20, 24, 31, .4);
  color: var(--ink-text);
}

.page-products #vcol-both:checked ~ .version-tabs label[for="vcol-both"],
.page-products #vcol-30:checked ~ .version-tabs label[for="vcol-30"],
.page-products #vcol-31:checked ~ .version-tabs label[for="vcol-31"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.page-products .version-table {
  overflow-x: auto;
  border: 1px solid var(--paper-line);
  background: #FBF6EC;
  border-radius: 2px;
}

.page-products .version-table table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-products .version-table th,
.page-products .version-table td {
  padding: 13px 15px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--paper-line);
  transition: opacity .22s var(--ease);
}

.page-products .version-table thead th {
  font-family: var(--font-data);
  font-weight: 500;
  font-size: 11.5px;
  letter-spacing: .07em;
  color: var(--slate);
  background: rgba(20, 24, 31, .06);
}

.page-products .version-table tbody th {
  width: 26%;
  font-weight: 600;
  color: var(--ink-text);
}

.page-products .version-table tbody td {
  line-height: 1.72;
  color: var(--slate);
}

.page-products .version-table tbody tr:nth-child(even) {
  background: rgba(20, 24, 31, .03);
}

.page-products .version-table tbody tr:last-child th,
.page-products .version-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-products #vcol-30:checked ~ .version-table th:nth-child(3),
.page-products #vcol-30:checked ~ .version-table td:nth-child(3) {
  opacity: .3;
}

.page-products #vcol-31:checked ~ .version-table th:nth-child(2),
.page-products #vcol-31:checked ~ .version-table td:nth-child(2) {
  opacity: .3;
}

.page-products .tick {
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 7px;
  border-radius: 50%;
  background: #6DA30A;
  box-shadow: 0 0 0 3px rgba(109, 163, 10, .18);
  vertical-align: middle;
}

/* ---------- 下一步 ---------- */
.page-products .feat-next {
  padding: 52px 0 68px;
  background: var(--ink-2);
}

.page-products .feat-next h2 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.3rem, 4vw, 1.7rem);
  color: var(--paper);
}

.page-products .next-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-products .next-links a {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 15px 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--haze);
  text-decoration: none;
  border: 1px solid var(--hairline);
  border-radius: 2px;
  transition: transform .24s var(--ease), border-color .24s var(--ease), color .24s var(--ease);
}

.page-products .next-links a:hover,
.page-products .next-links a:focus-visible {
  transform: translateX(4px);
  border-color: var(--blue-line);
  color: var(--paper);
}

.page-products .next-links strong {
  flex: none;
  font-family: var(--font-data);
  font-weight: 500;
  font-size: 11.5px;
  letter-spacing: .07em;
  color: var(--blue);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 700px) {
  .page-products .feat-hero__inner {
    padding: 32px 28px 34px;
  }

  .page-products .tracklist {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .page-products .v4-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-products .next-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-products .feat-hero {
    padding: 36px 0 72px;
  }

  .page-products .feat-hero__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: 44px;
    padding: 40px 36px 42px;
  }

  .page-products .feat-deep__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 44px;
    align-items: start;
  }

  .page-products .feat-deep {
    padding: 64px 0;
  }

  .page-products .feat-figure--tall {
    margin-bottom: 26px;
  }
}

@media (min-width: 1024px) {
  .page-products .tracklist {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-products .tracklist li:nth-child(even) {
    margin-top: 26px;
  }

  .page-products .v4-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-products .v4-grid > * {
    padding: 16px 12px;
  }
}

@media (min-width: 1180px) {
  .page-products .feat-hero__inner {
    padding: 48px 44px 50px;
  }

  .page-products .feat-figure--ver {
    max-width: 360px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-products .tracklist__link,
  .page-products .next-links a,
  .page-products .v4-grid > *,
  .page-products .version-table th,
  .page-products .version-table td {
    transition: none;
  }

  .page-products .tracklist__link:hover,
  .page-products .tracklist__link:focus-visible,
  .page-products .next-links a:hover,
  .page-products .next-links a:focus-visible {
    transform: none;
  }
}
<<<END>>>

等等，我写完之后数一下标记——我最后又加了一行 `<<<END>>>`，但要求里说标记只能有三个：``、``，而且每个只能出现一次。`<<<END>>>` 不在要求里，是个多余的标记，必须删掉。输出只能到 `PAGE_CSS` 的内容结束为止，不能再有别的标记。