@charset "UTF-8";

:root {
  --brand: #62edb8;
  --brand-dark: #19b984;
  --accent: #ff8296;
  --navy: #18344f;
  --navy-deep: #112b43;
  --ink: #172d42;
  --muted: #677685;
  --paper: #fff9fa;
  --white: #ffffff;
  --line: #244660;
  --soft-line: #cad1d7;
  --container: 1200px;
}

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

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  margin: 0;
  padding-top: 58px;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.7;
}

body.nav-open {
  overflow: hidden;
}

img {
  display: block;
  max-width: 100%;
}

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

button {
  border: 0;
  color: inherit;
  font: inherit;
  cursor: pointer;
}

a,
button,
summary {
  -webkit-tap-highlight-color: transparent;
}

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--brand);
  outline-offset: 3px;
}

h1,
h2,
h3,
p,
figure,
ul,
ol {
  margin-top: 0;
}

.container {
  width: min(calc(100% - 40px), var(--container));
  margin-inline: auto;
}

.brand-bar {
  position: fixed;
  z-index: 80;
  top: 0;
  right: 0;
  left: 0;
  display: flex;
  min-height: 58px;
  align-items: center;
  justify-content: space-between;
  padding: 7px 18px;
  background: var(--brand);
}

.brand,
.footer-brand {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: 10px;
}

.brand img,
.footer-brand img {
  flex: 0 0 auto;
  border: 1px solid var(--navy);
  object-fit: cover;
}

.brand > span,
.footer-brand > span {
  display: flex;
  min-width: 0;
  flex-direction: column;
  line-height: 1.1;
}

.brand strong {
  font-size: 17px;
  letter-spacing: -0.02em;
}

.brand small,
.footer-brand small {
  margin-top: 3px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.brand-actions {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 8px;
}

.top-download {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  gap: 3px;
  padding: 0 14px;
  color: var(--white);
  background: var(--navy-deep);
  font-size: 12px;
  font-weight: 900;
}

.top-download span {
  color: var(--brand);
}

.menu-button {
  display: none;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  border: 1px solid var(--navy);
  background: transparent;
}

.menu-button span {
  width: 18px;
  height: 2px;
  background: var(--navy);
}

.hero {
  display: grid;
  min-height: 620px;
  grid-template-columns: max-content minmax(0, 1fr);
  scroll-margin-top: 70px;
}

.channel-nav {
  display: flex;
  min-width: 205px;
  flex-direction: column;
  justify-content: space-between;
  padding: 18px 10px 30px;
  background: var(--white);
}

.channel-nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.channel-nav li + li {
  margin-top: 9px;
}

.channel-nav a {
  display: flex;
  min-height: 52px;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--line);
  padding: 0 14px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 800;
}

.channel-nav a span {
  font-size: 12px;
}

.channel-nav a:hover,
.channel-nav a.is-active {
  border-color: var(--accent);
  color: var(--white);
  background: var(--accent);
}

.channel-nav > p {
  margin: 0;
  border-top: 1px solid var(--soft-line);
  padding: 20px 8px 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
}

.hero-visual {
  position: relative;
  isolation: isolate;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: clamp(40px, 6vw, 86px) clamp(38px, 8vw, 130px);
  background: #c8c8c8 url("../images/bjt.jpg") center 26% / cover no-repeat;
}

.hero-visual::before {
  position: absolute;
  z-index: -1;
  inset: 0;
  background: linear-gradient(90deg, rgba(5, 9, 12, 0.28), transparent 55%);
  content: "";
}

.hero-panel {
  position: relative;
  width: clamp(44%, 48vw, 58%);
  max-width: 570px;
  border-left: 5px solid var(--accent);
  padding: clamp(28px, 4vw, 52px);
  color: var(--white);
  background: rgba(10, 13, 16, 0.93);
}

.eyebrow {
  margin-bottom: 7px;
  color: var(--brand);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.eyebrow--accent {
  color: var(--accent);
}

.hero-panel h1 {
  margin-bottom: 20px;
  font-size: clamp(56px, 6.5vw, 92px);
  letter-spacing: -0.07em;
  line-height: 0.96;
}

.hero-slogan {
  display: inline-block;
  margin: 0;
  padding: 3px 8px 5px;
  color: var(--white);
  background: var(--accent);
  box-decoration-break: clone;
  font-size: clamp(25px, 3vw, 39px);
  font-weight: 900;
  letter-spacing: -0.05em;
  line-height: 1.32;
  -webkit-box-decoration-break: clone;
}

.hero-intro {
  max-width: 460px;
  margin: 24px 0 15px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 13px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-bottom: 20px;
}

.hero-tags span {
  border: 1px solid rgba(255, 255, 255, 0.55);
  padding: 2px 9px;
  font-size: 12px;
  font-weight: 800;
}

.hero-download {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  gap: 18px;
  padding: 0 16px;
  color: var(--ink);
  background: var(--white);
  font-size: 12px;
  font-weight: 900;
}

.hero-download:hover {
  background: var(--brand);
}

.hero-download b {
  font-size: 16px;
}

.age-label {
  display: block;
  margin-top: 17px;
  color: rgba(255, 255, 255, 0.6);
  font-size: 12px;
}

.content-section {
  padding: 72px 0;
  scroll-margin-top: 74px;
}

.section-heading {
  display: flex;
  align-items: baseline;
  gap: 15px;
  margin-bottom: 27px;
}

.section-heading .eyebrow {
  flex: 0 0 auto;
  margin-bottom: 0;
}

.section-heading h2,
.editor-note h2,
.download-section h2 {
  margin: 0;
  font-size: clamp(35px, 4vw, 52px);
  letter-spacing: -0.06em;
  line-height: 1;
}

.section-heading > span {
  color: var(--muted);
  font-size: 12px;
}

.guide {
  padding-top: 82px;
}

.guide-layout {
  display: grid;
  align-items: stretch;
  grid-template-columns: minmax(0, 1.4fr) minmax(360px, 1fr);
  gap: 16px;
}

.guide-table {
  border: 1px solid var(--line);
}

.guide-row {
  display: grid;
  min-height: 56px;
  align-items: center;
  grid-template-columns: 82px 126px minmax(0, 1fr);
}

.guide-row + .guide-row {
  border-top: 1px solid var(--soft-line);
}

.guide-row > * {
  min-width: 0;
  margin: 0;
  padding: 10px 15px;
  font-size: 12px;
}

.guide-row > * + * {
  border-left: 1px solid var(--soft-line);
}

.guide-row p {
  color: var(--muted);
}

.guide-row--head {
  min-height: 42px;
  color: var(--white);
  background: var(--navy);
}

.guide-row--head > * + * {
  border-left-color: rgba(255, 255, 255, 0.22);
}

.mini-covers {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  border: 1px solid var(--line);
}

.mini-covers figure {
  display: grid;
  min-width: 0;
  margin: 0;
  grid-template-rows: minmax(0, 1fr) auto;
  overflow: hidden;
}

.mini-covers figure + figure {
  border-left: 1px solid var(--line);
}

.mini-covers img {
  width: 100%;
  height: 100%;
  min-height: 120px;
  object-fit: cover;
  object-position: center 26%;
}

.mini-covers figcaption {
  overflow: hidden;
  padding: 7px 4px;
  color: var(--white);
  background: var(--navy);
  font-size: 12px;
  font-weight: 800;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.plan {
  padding-top: 30px;
}

.plan-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.plan-grid article,
.recommendation-cards article {
  border: 1px solid var(--line);
  padding: 25px 20px;
}

.plan-grid article > span {
  color: var(--accent);
  font-size: 12px;
  font-weight: 900;
}

.plan-grid h3,
.recommendation-cards h3 {
  margin: 18px 0 7px;
  font-size: 16px;
}

.plan-grid p,
.recommendation-cards p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

.explore {
  padding-top: 42px;
}

.explore-layout {
  display: grid;
  min-height: 470px;
  grid-template-columns: minmax(0, 1.35fr) minmax(330px, 0.85fr);
  gap: 22px;
}

.explore-copy {
  border: 1px solid var(--line);
  padding: 34px;
}

.section-heading--compact {
  margin-bottom: 14px;
  border-bottom: 1px solid var(--soft-line);
  padding-bottom: 18px;
}

.explore-copy ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.explore-copy li {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 10px;
  padding: 19px 0;
}

.explore-copy li + li {
  border-top: 1px solid var(--soft-line);
}

.explore-copy li > span {
  color: var(--accent);
  font-size: 12px;
  font-weight: 900;
}

.explore-copy h3 {
  margin-bottom: 4px;
  font-size: 14px;
}

.explore-copy li p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

.explore-image {
  position: relative;
  min-width: 0;
  overflow: hidden;
  margin: 0;
  border: 1px solid var(--line);
}

.explore-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 25%;
}

.explore-image figcaption,
.gallery-item figcaption {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 10px 13px;
  color: var(--white);
  background: rgba(8, 17, 24, 0.88);
  font-size: 12px;
  font-weight: 800;
}

.steps {
  padding-top: 52px;
}

.step-grid {
  display: grid;
  margin: 0;
  padding: 0;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  list-style: none;
}

.step-grid li {
  min-width: 0;
  border: 1px solid var(--line);
  padding: 24px 20px;
}

.step-grid li > span {
  color: var(--accent);
  font-size: 12px;
  font-weight: 900;
}

.step-grid h3 {
  margin: 20px 0 6px;
  font-size: 16px;
}

.step-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

.faq {
  padding-top: 48px;
}

.accordion {
  border-top: 1px solid var(--line);
}

.accordion article {
  border-bottom: 1px solid var(--line);
}

.accordion button {
  display: flex;
  width: 100%;
  min-height: 58px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 12px 10px;
  background: transparent;
  font-size: 12px;
  font-weight: 800;
  text-align: left;
}

.accordion button i {
  color: var(--accent);
  font-size: 17px;
  font-style: normal;
}

.accordion button[aria-expanded="true"] i {
  transform: rotate(45deg);
}

.accordion article > div {
  padding: 0 42px 18px 10px;
  color: var(--muted);
  font-size: 12px;
}

.accordion article > div p {
  margin: 0;
}

.accordion article > div a {
  color: var(--brand-dark);
  font-weight: 800;
}

.gallery {
  padding-top: 54px;
}

.gallery-grid {
  display: grid;
  height: 560px;
  grid-template-columns: 1.2fr 0.6fr 0.6fr;
  grid-template-rows: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.gallery-item {
  position: relative;
  min-width: 0;
  overflow: hidden;
  margin: 0;
  border: 1px solid var(--line);
}

.gallery-item--lead {
  grid-column: 1;
  grid-row: 1 / 3;
}

.gallery-item:nth-child(2) {
  grid-column: 2;
  grid-row: 1;
}

.gallery-item:nth-child(3) {
  grid-column: 3;
  grid-row: 1;
}

.gallery-item:nth-child(4) {
  grid-column: 2;
  grid-row: 2;
}

.gallery-item--wide {
  grid-column: 3;
  grid-row: 2;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 25%;
}

.recommendation {
  padding-top: 34px;
  padding-bottom: 92px;
}

.recommendation-layout {
  display: grid;
  align-items: start;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(45px, 8vw, 110px);
}

.recommendation-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.recommendation-cards h3 {
  margin-top: 0;
}

.editor-note {
  border-left: 5px solid var(--accent);
  padding-left: 26px;
}

.editor-note h2 {
  margin-bottom: 18px;
  font-size: clamp(29px, 3.2vw, 43px);
}

.editor-note > p:not(.eyebrow) {
  color: var(--muted);
  font-size: 12px;
}

.editor-note a {
  color: var(--accent);
  font-size: 12px;
  font-weight: 900;
}

.reader-voices {
  padding: 76px 0 86px;
  color: var(--white);
  background: var(--navy);
  scroll-margin-top: 74px;
}

.section-heading--light h2 {
  color: var(--white);
}

.section-heading--light > span {
  color: rgba(255, 255, 255, 0.58);
}

.comment-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.comment-card {
  min-width: 0;
  border: 1px solid rgba(255, 255, 255, 0.42);
  padding: 20px;
  background: rgba(8, 28, 46, 0.18);
}

.comment-card header {
  display: grid;
  align-items: center;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
}

.comment-card img {
  width: 42px;
  height: 42px;
  border: 2px solid var(--brand);
  object-fit: cover;
}

.comment-card header div {
  display: flex;
  min-width: 0;
  flex-direction: column;
}

.comment-card strong {
  overflow: hidden;
  font-size: 12px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.comment-card header div span {
  color: var(--brand);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.comment-card time {
  color: rgba(255, 255, 255, 0.55);
  font-size: 12px;
}

.comment-card > p {
  margin: 16px 0 0;
  color: rgba(255, 255, 255, 0.76);
  font-size: 12px;
}

.comments-empty {
  grid-column: 1 / -1;
  margin: 0;
  border: 1px dashed rgba(255, 255, 255, 0.4);
  padding: 24px;
  color: rgba(255, 255, 255, 0.62);
  text-align: center;
}

.download-section {
  padding: 126px 0 132px;
  text-align: center;
  background: var(--white);
  scroll-margin-top: 74px;
}

.download-section .eyebrow {
  margin-bottom: 13px;
}

.download-section h2 {
  margin-bottom: 17px;
  font-size: clamp(37px, 4.5vw, 60px);
}

.download-section > .container > p:not(.eyebrow) {
  margin-bottom: 25px;
  color: var(--muted);
  font-size: 12px;
}

.download-section a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 18px;
  padding: 0 20px;
  color: var(--ink);
  background: var(--brand);
  font-size: 12px;
  font-weight: 900;
}

.download-section a:hover {
  color: var(--white);
  background: var(--navy);
}

.site-footer {
  color: var(--white);
  background: var(--navy);
}

.footer-main {
  display: grid;
  align-items: center;
  grid-template-columns: auto 1fr auto;
  gap: 34px;
  padding-top: 42px;
  padding-bottom: 34px;
}

.footer-brand strong {
  font-size: 15px;
}

.footer-main > p {
  margin: 0;
  color: rgba(255, 255, 255, 0.52);
  font-size: 12px;
}

.site-footer ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-footer nav a {
  color: rgba(255, 255, 255, 0.78);
  font-size: 12px;
}

.site-footer nav a:hover {
  color: var(--brand);
}

.copyright {
  margin: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  padding: 17px;
  color: rgba(255, 255, 255, 0.48);
  font-size: 12px;
  text-align: center;
}

.back-to-top {
  position: fixed;
  z-index: 70;
  right: 18px;
  bottom: 18px;
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border: 1px solid var(--line);
  color: var(--ink);
  background: var(--brand);
  font-weight: 900;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

@media (prefers-reduced-motion: no-preference) {
  .accordion button i,
  .back-to-top {
    transition: opacity 150ms ease, transform 150ms ease;
  }
}

@media (max-width: 1024px) {
  .channel-nav {
    min-width: 178px;
  }

  .hero-panel {
    width: 64%;
  }

  .guide-layout {
    grid-template-columns: 1fr;
  }

  .mini-covers {
    min-height: 210px;
  }

  .explore-layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(310px, 0.9fr);
  }

  .comment-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-main {
    grid-template-columns: auto 1fr;
  }

  .site-footer nav {
    grid-column: 1 / -1;
  }

  .site-footer ul {
    justify-content: flex-start;
  }
}

@media (max-width: 780px) {
  body {
    padding-top: 58px;
  }

  .container {
    width: min(calc(100% - 28px), var(--container));
  }

  .brand-bar {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    min-height: 58px;
    padding: 7px 14px;
  }

  .brand img {
    width: 38px;
    height: 38px;
  }

  .brand small {
    display: none;
  }

  .top-download {
    min-height: 36px;
    padding: 0 10px;
  }

  .top-download span {
    display: none;
  }

  .menu-button {
    display: flex;
  }

  .hero {
    display: block;
    min-height: auto;
    scroll-margin-top: 66px;
  }

  .channel-nav {
    position: fixed;
    z-index: 75;
    top: 58px;
    right: 0;
    left: 0;
    display: block;
    min-width: 0;
    border-bottom: 1px solid var(--line);
    padding: 11px 14px;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-110%);
    transition: opacity 150ms ease, transform 150ms ease;
  }

  .nav-open .channel-nav {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .channel-nav ul {
    display: flex;
    overflow-x: auto;
    gap: 8px;
    scrollbar-width: none;
  }

  .channel-nav ul::-webkit-scrollbar {
    display: none;
  }

  .channel-nav li + li {
    margin-top: 0;
  }

  .channel-nav a {
    min-height: 39px;
    gap: 10px;
    padding: 0 13px;
    white-space: nowrap;
  }

  .channel-nav > p {
    display: none;
  }

  .hero-visual {
    min-height: 650px;
    align-items: end;
    padding: 72px 15px 24px;
    background-position: 56% 16%;
  }

  .hero-panel {
    width: 100%;
    max-width: none;
    padding: 24px;
  }

  .hero-panel h1 {
    font-size: clamp(53px, 15vw, 72px);
  }

  .hero-slogan {
    font-size: clamp(24px, 8vw, 33px);
  }

  .content-section {
    padding: 58px 0;
    scroll-margin-top: 66px;
  }

  .section-heading {
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 6px 10px;
  }

  .section-heading h2,
  .editor-note h2,
  .download-section h2 {
    font-size: clamp(33px, 10vw, 44px);
  }

  .section-heading > span {
    width: 100%;
  }

  .guide {
    padding-top: 62px;
  }

  .guide-row {
    grid-template-columns: 57px 88px minmax(150px, 1fr);
  }

  .guide-table {
    overflow-x: auto;
  }

  .guide-row {
    min-width: 470px;
  }

  .mini-covers {
    overflow-x: auto;
    grid-auto-columns: 38%;
    grid-auto-flow: column;
    grid-template-columns: none;
    scroll-snap-type: x mandatory;
  }

  .mini-covers figure {
    min-height: 230px;
    scroll-snap-align: start;
  }

  .plan-grid {
    grid-template-columns: 1fr;
  }

  .explore-layout {
    grid-template-columns: 1fr;
  }

  .explore-copy {
    padding: 25px 20px;
  }

  .explore-image {
    min-height: 520px;
  }

  .step-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .gallery-grid {
    height: auto;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-template-rows: none;
  }

  .gallery-item,
  .gallery-item:nth-child(2),
  .gallery-item:nth-child(3),
  .gallery-item:nth-child(4),
  .gallery-item--wide {
    min-height: 260px;
    grid-column: auto;
    grid-row: auto;
  }

  .gallery-item--lead {
    min-height: 440px;
    grid-column: 1 / -1;
  }

  .recommendation-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .reader-voices {
    padding: 60px 0 68px;
    scroll-margin-top: 66px;
  }

  .section-heading--light {
    color: var(--white);
  }

  .comment-grid {
    grid-template-columns: 1fr;
  }

  .download-section {
    padding: 96px 0 102px;
    scroll-margin-top: 66px;
  }

  .footer-main {
    justify-items: center;
    grid-template-columns: 1fr;
    text-align: center;
  }

  .site-footer nav {
    grid-column: auto;
  }

  .site-footer ul {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .brand {
    gap: 7px;
  }

  .brand strong {
    font-size: 15px;
    white-space: nowrap;
  }

  .top-download {
    max-width: 100px;
    overflow: hidden;
    font-size: 12px;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .hero-visual {
    min-height: 620px;
  }

  .hero-panel {
    border-left-width: 4px;
    padding: 21px 18px;
  }

  .mini-covers {
    grid-auto-columns: 48%;
  }

  .step-grid,
  .recommendation-cards {
    grid-template-columns: 1fr;
  }

  .gallery-grid {
    grid-template-columns: 1fr;
  }

  .gallery-item,
  .gallery-item:nth-child(2),
  .gallery-item:nth-child(3),
  .gallery-item:nth-child(4),
  .gallery-item--wide,
  .gallery-item--lead {
    min-height: 420px;
    grid-column: auto;
  }

  .comment-card header {
    grid-template-columns: auto 1fr;
  }

  .comment-card time {
    grid-column: 2;
  }
}