/* IE 可读样式：展开变量，去掉 Grid / clamp / gap。现代浏览器会由 styles.css 覆盖。 */
header, nav, main, section, article, footer, figure, figcaption { display: block; }
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #3d404b;
  background: #fffaf2;
  -webkit-font-smoothing: antialiased;
}

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

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

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

:focus-visible {
  outline: 2px solid #ff8429;
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: 100%; max-width: 1120px;
  margin-left: auto; margin-right: auto;
}

.container--narrow {
  width: 100%; max-width: 720px;
}

.section {
  padding-top: 64px; padding-bottom: 64px;
  scroll-margin-top: calc(72px + 16px);
}

.section--alt {
  background: #fff8f0;
}

.section__header {
  text-align: center;
  max-width: 640px;
  margin-left: auto; margin-right: auto;
  margin-bottom: 48px;
}

.section__eyebrow {
  display: inline-block;
  padding: 10px 24px;
  margin-bottom: 24px;
  font-size: 18px;
  font-weight: 600;
  color: #fff;
  background: #ff8429;
  border-radius: 100px;
  letter-spacing: 0.02em;
  line-height: 1.2;
}

.section__title {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.section__desc {
  margin-top: 16px;
  font-size: 17px;
  color: #696e81;
  line-height: 1.7;
}

.grid-2 {
  display: block;
  
}

.grid-3 {
  display: block;
  
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
    align-items: center;
  }

  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
    align-items: stretch;
  }
}

.split {
  display: block;
  
  align-items: center;
}

@media (min-width: 900px) {
  .split {
    grid-template-columns: 1fr 1fr;
  }

  .split--reverse .split__media {
    order: -1;
  }
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 72px;
  background: rgba(255, 250, 242, 0.92);
  
  border-bottom: 1px solid #ede0d1;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.site-logo {
  display: flex;
  align-items: center;
  
  font-size: 18px;
  font-weight: 700;
  color: #3d404b;
}

.site-logo__icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  object-fit: cover;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(61, 64, 75, 0.06);
}

.site-nav {
  display: none;
  align-items: center;
  
}

.site-nav a {
  font-size: 15px;
  color: #696e81;
  transition: color 150ms;
}

.site-nav a:hover {
  color: #ff8429;
}

.site-header__actions {
  display: flex;
  align-items: center;
  
}

.header-download {
  display: inline-flex;
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  
  width: 40px;
  height: 40px;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: #3d404b;
  border-radius: 2px;
  transition: transform 280ms cubic-bezier(0.22, 1, 0.36, 1);
}

@media (min-width: 900px) {
  .site-nav {
    display: flex;
  }

  .nav-toggle {
    display: none;
  }
}

/* Mobile nav drawer */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 72px 0 0 0;
  z-index: 99;
  background: #fffaf2;
  padding: 24px;
  border-top: 1px solid #ede0d1;
}

.mobile-nav.is-open {
  display: block;
}

.mobile-nav a {
  display: block;
  padding: 16px;
  font-size: 17px;
  color: #3d404b;
  border-bottom: 1px solid #e4e6ee;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  
  padding: 12px 24px;
  font-size: 16px;
  font-weight: 600;
  border-radius: 22px;
  transition: opacity 150ms, transform 150ms;
}

.btn:active {
  transform: scale(0.98);
  opacity: 0.9;
}

.btn--primary {
  color: #fff;
  background: linear-gradient(135deg, #ff8125 0%, #ffa154 45%, #ffbb7a 100%);
  box-shadow: 0 8px 24px rgba(255, 132, 41, 0.12);
}

.btn--ghost {
  color: #3d404b;
  background: #ffffff;
  border: 1px solid #e4e6ee;
}

.btn--disabled {
  color: #9598a9;
  background: #f2f2f2;
  border: 1px solid #e4e6ee;
  cursor: not-allowed;
  box-shadow: none;
}

.btn--sm {
  padding: 10px 18px;
  font-size: 14px;
}

/* Hero */
.hero {
  position: relative;
  padding-top: 64px; padding-bottom: 96px;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -20%;
  right: -10%;
  width: 60%;
  max-width: 520px;
  
  background: radial-gradient(circle, rgba(255, 187, 122, 0.35) 0%, transparent 70%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
}

.hero__layout {
  display: block;
  
  align-items: center;
}

@media (min-width: 900px) {
  .hero__layout {
    grid-template-columns: 1fr 1fr;
  }
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  
  padding: 8px 16px;
  margin-bottom: 24px;
  font-size: 14px;
  font-weight: 500;
  color: #007049;
  background: rgba(0, 112, 73, 0.08);
  border-radius: 100px;
}

.hero__title {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.hero__title em {
  font-style: normal;
  color: #ff8429;
}

.hero__subtitle {
  margin-top: 24px;
  max-width: 480px;
  font-size: 17px;
  color: #696e81;
  line-height: 1.7;
}

.hero__subtitle-line {
  display: block;
}

@media (min-width: 900px) {
  .hero__subtitle-line {
    white-space: nowrap;
  }
}

.hero__scan-hint {
  margin-top: 24px;
  font-size: 14px;
  font-weight: 600;
  color: #ff8429;
}

.hero__qr-grid {
  display: block;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  
  margin-top: 24px;
  max-width: 280px;
}

.hero-qr {
  text-align: center;
}

.hero-qr__label {
  margin-bottom: 8px;
  font-size: 12px;
  font-weight: 600;
  color: #696e81;
}

.hero-qr__link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.hero-qr__box {
  width: 100%;
  
  margin-left: auto; margin-right: auto;
  border-radius: 12px;
  background: #ffffff;
  border: 1px solid #ede0d1;
  box-shadow: 0 2px 8px rgba(61, 64, 75, 0.06);
}

.hero-qr__image {
  display: block;
  object-fit: contain;
  padding: 4px;
}

.hero-qr .qr-placeholder {
  display: block;
  
  justify-items: center;
  
  height: 100%;
  border-style: dashed;
  background: #fafafa;
  font-size: 11px;
  color: #9598a9;
}

.hero-qr .qr-placeholder img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  opacity: 0.55;
}

@media (max-width: 480px) {
  .hero__qr-grid {
    max-width: none;
  }
}

.hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero__phone {
  width: 240px;
  border-radius: 24px;
  box-shadow: 0 16px 48px rgba(255, 132, 41, 0.15);
  border: 4px solid #ffffff;
}

@media (min-width: 900px) {
  .hero__phone {
    width: 260px;
  }
}

/* Feature cards */
.features-section {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 8% 18%, rgba(255, 187, 122, 0.28), transparent 34%),
    radial-gradient(circle at 92% 78%, rgba(255, 132, 41, 0.12), transparent 32%),
    linear-gradient(180deg, #fffaf2 0%, #fff6ea 100%);
}

.features-section::before,
.features-section::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

.features-section::before {
  top: 72px;
  left: -48px;
  width: 180px;
  height: 180px;
  background: radial-gradient(circle, rgba(255, 187, 122, 0.35) 0%, transparent 70%);
}

.features-section::after {
  right: -36px;
  bottom: 48px;
  width: 220px;
  height: 220px;
  background: radial-gradient(circle, rgba(255, 132, 41, 0.16) 0%, transparent 72%);
}

.features-section .container {
  position: relative;
  z-index: 1;
}

.features-grid {
  display: block;
  
}

@media (min-width: 768px) {
  .features-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: stretch;
  }
}

.feature-card {
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 28px 22px 24px;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, #fffaf5 100%);
  border: 1px solid rgba(237, 224, 209, 0.95);
  border-radius: 20px;
  box-shadow: 0 10px 28px rgba(255, 132, 41, 0.08);
  transition:
    box-shadow 280ms cubic-bezier(0.22, 1, 0.36, 1),
    transform 280ms cubic-bezier(0.22, 1, 0.36, 1),
    border-color 280ms;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 22px;
  right: 22px;
  height: 3px;
  border-radius: 999px;
  background: linear-gradient(135deg, #ff8125 0%, #ffa154 45%, #ffbb7a 100%);
  opacity: 0.9;
}

.feature-card::after {
  content: "";
  position: absolute;
  right: -28px;
  bottom: -36px;
  width: 110px;
  height: 110px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 187, 122, 0.22) 0%, transparent 70%);
  pointer-events: none;
}

.feature-card:hover {
  border-color: rgba(255, 168, 92, 0.7);
  box-shadow: 0 16px 36px rgba(255, 132, 41, 0.14);
  transform: translateY(-4px);
}

.feature-card__head {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  
  margin-bottom: 12px;
}

.feature-card__num {
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 12px;
  color: #ff8429;
  background: #fff1e4;
  border: 1px solid #ffd7b0;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.02em;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.feature-card__title {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.35;
}

.feature-card__desc {
  position: relative;
  z-index: 1;
  font-size: 15px;
  color: #696e81;
  line-height: 1.65;
}

/* Content system */
.content-system {
  display: block;
  
  align-items: center;
}

.content-system__main {
  display: block;
  align-content: center;
}

.content-system__kicker {
  margin-bottom: 12px;
  color: #ff8429;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.content-system__title {
  max-width: 520px;
  font-size: 18px;
  line-height: 1.4;
}

@media (min-width: 768px) {
  .content-system__title {
    white-space: nowrap;
  }
}

.content-system__intro {
  max-width: 520px;
  margin-top: 16px;
  color: #696e81;
  font-size: 16px;
  line-height: 1.7;
}

.content-system__framework {
  display: block;
  
  margin-top: 32px;
  overflow: hidden;
  background: #ffffff;
  border: 1px solid #ede0d1;
  border-radius: 16px;
  box-shadow: 0 2px 8px rgba(61, 64, 75, 0.06);
}

.content-system__item {
  display: block;
  grid-template-columns: 32px minmax(0, 1fr);
  
  align-items: start;
  padding: 16px;
  border-bottom: 1px solid #ede0d1;
}

.content-system__item:last-child {
  border-bottom: 0;
}

.content-system__icon {
  display: block;
  
  width: 28px;
  height: 28px;
  margin-top: 1px;
  border-radius: 50%;
  color: #ff8429;
  background: #fff2e5;
}

.content-system__icon svg {
  display: block;
}

.content-system__item h4 {
  margin: 2px 0 4px;
  font-size: 16px;
  line-height: 1.35;
}

.content-system__item p {
  color: #696e81;
  font-size: 14px;
  line-height: 1.6;
}

.content-system__figure {
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.content-system__figure img {
  width: 100%;
  max-width: 560px;
}

@media (min-width: 900px) {
  .content-system {
    grid-template-columns: minmax(0, 1fr) minmax(360px, 0.9fr);
  }
}

/* Steps */
.steps {
  display: block;
  
}

.step {
  text-align: center;
  padding: 24px;
}

.step__arrow {
  display: none;
}

.step__num {
  width: 52px;
  height: 52px;
  margin-left: auto; margin-right: auto;
  margin-bottom: 16px;
  display: block;
  
  font-size: 22px;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, #ff8125 0%, #ffa154 45%, #ffbb7a 100%);
  border-radius: 50%;
  box-shadow: 0 8px 24px rgba(255, 132, 41, 0.12);
  border: 3px solid #ffffff;
}

@media (min-width: 768px) {
  .steps {
    grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
    align-items: start;
    
  }

  .step__arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    align-self: center;
    padding-top: 24px;
    font-size: 28px;
    font-weight: 700;
    color: #ff8429;
    line-height: 1;
    opacity: 0.85;
  }
}

.step__title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.step__desc {
  font-size: 14px;
  color: #696e81;
  line-height: 1.6;
}

/* Audience cards */
.audience-card {
  padding: 48px;
  border-radius: 16px;
  border: 1px solid #ede0d1;
}

.audience-card--child {
  background: linear-gradient(160deg, #fff5e8 0%, #fffaf2 100%);
}

.audience-card--parent {
  background: linear-gradient(160deg, #f0f7ff 0%, #fffaf2 100%);
}

.audience-card__tag {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.audience-card--child .audience-card__tag {
  color: #ff8429;
}

.audience-card--parent .audience-card__tag {
  color: #3484f5;
}

.audience-card__title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
}

.audience-card__list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 12px;
  font-size: 15px;
  color: #696e81;
}

.audience-card__list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #ff8429;
  font-weight: 700;
}

/* Screenshot showcase */
.showcase {
  display: flex;
  
  overflow-x: auto;
  padding-bottom: 16px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.showcase__item {
  flex: 0 0 auto;
  width: 240px;
  scroll-snap-align: start;
}

.showcase__item img {
  border-radius: 20px;
  box-shadow: 0 8px 24px rgba(255, 132, 41, 0.12);
  border: 3px solid #ffffff;
}

.showcase__caption {
  margin-top: 12px;
  font-size: 14px;
  color: #9598a9;
  text-align: center;
}

/* Download */
.download-section {
  background:
    radial-gradient(circle at 15% 10%, rgba(255, 187, 122, 0.22), transparent 28%),
    linear-gradient(180deg, #fff8f0 0%, #fffaf2 100%);
}

.download-grid {
  display: block;
  
}

.download-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 32px;
  background: #ffffff;
  border: 1px solid #ede0d1;
  border-radius: 16px;
  box-shadow: 0 2px 8px rgba(61, 64, 75, 0.06);
}

.download-card--muted {
  background: rgba(255, 255, 255, 0.68);
}

.download-card--product {
  align-items: center;
  text-align: center;
}

.download-card__product-head {
  display: flex;
  align-items: center;
  align-self: stretch;
  
  margin-bottom: 24px;
  text-align: left;
}

.download-card__head {
  display: flex;
  align-items: center;
  
}

.download-card__icon,
.platform-icon {
  flex: 0 0 64px;
  width: 64px;
  height: 64px;
  border-radius: 16px;
}

.download-card__icon {
  object-fit: cover;
  box-shadow: 0 2px 8px rgba(61, 64, 75, 0.06);
}

.platform-icon {
  display: block;
  
  color: #3d404b;
  background: #f2f2f2;
  border: 1px solid #e4e6ee;
  font-size: 16px;
  font-weight: 700;
}

.download-card__platform {
  margin-bottom: 2px;
  color: #ff8429;
  font-size: 13px;
  font-weight: 700;
}

.download-card__title {
  font-size: 20px;
  line-height: 1.35;
}

.download-card__meta {
  margin-top: 4px;
  color: #9598a9;
  font-size: 13px;
}

.download-card__desc {
  margin-top: 24px; margin-bottom: 24px;
  color: #696e81;
  font-size: 14px;
}

.download-card__button {
  width: 100%;
  margin-top: auto;
}

.download-card--qr .download-card__title {
  margin-bottom: 24px;
  text-align: center;
}

.qr-list {
  display: block;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  
}

.qr-item {
  margin: 0;
  text-align: center;
}

.qr-item__image,
.qr-placeholder {
  width: 100%;
  max-width: 180px;
  
  margin-left: auto; margin-right: auto;
  border-radius: 12px;
  background: #fff;
}

.qr-item__image {
  object-fit: contain;
  border: 1px solid #e4e6ee;
}

.qr-placeholder {
  display: block;
  
  justify-items: center;
  
  color: #9598a9;
  border: 1px dashed #e4e6ee;
  background: #fafafa;
  font-size: 12px;
}

.qr-placeholder--large,
.qr-item__image--large {
  width: 220px;
  max-width: 220px;
  margin-left: auto; margin-right: auto;
}

.qr-placeholder--large {
  font-size: 13px;
}

.qr-placeholder--large strong {
  color: #9598a9;
}

.download-card__status {
  margin-top: 16px;
  color: #9598a9;
  font-size: 13px;
}

.qr-placeholder img {
  border-radius: 14px;
  opacity: 0.6;
}

.qr-item figcaption {
  display: block;
  
  margin-top: 12px;
  font-size: 13px;
}

.qr-item figcaption span {
  color: #9598a9;
  font-size: 12px;
}

.download-note {
  margin-top: 24px;
  color: #9598a9;
  font-size: 13px;
  text-align: center;
}

.download-note a {
  color: #ff8429;
}

@media (min-width: 900px) {
  .download-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* FAQ */
.faq-item {
  border-bottom: 1px solid #e4e6ee;
}

.faq-item__question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  
  padding: 24px 0;
  font-size: 16px;
  font-weight: 600;
  text-align: left;
  color: #3d404b;
}

.faq-item__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  color: #ff8429;
  transition: transform 280ms;
}

.faq-item.is-open .faq-item__icon {
  transform: rotate(45deg);
}

.faq-item__answer {
  display: none;
  padding-bottom: 24px;
  font-size: 15px;
  color: #696e81;
  line-height: 1.7;
}

.faq-item.is-open .faq-item__answer {
  display: block;
}

/* CTA band */
.cta-band {
  text-align: center;
  padding: 64px 24px;
  background: linear-gradient(135deg, #ff8125 0%, #ffa154 45%, #ffbb7a 100%);
  border-radius: 16px;
  color: #fff;
}

.cta-band__title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-band__desc {
  font-size: 17px;
  opacity: 0.95;
  margin-bottom: 32px;
  margin-left: auto; margin-right: auto;
  line-height: 1.6;
}

@media (min-width: 768px) {
  .cta-band__desc {
    white-space: nowrap;
  }
}

.cta-band .btn--ghost {
  background: #fff;
  border-color: transparent;
  color: #ff8429;
}

/* Footer */
.site-footer {
  padding-top: 48px; padding-bottom: 48px;
  background: #3d404b;
  color: rgba(255, 255, 255, 0.75);
  font-size: 14px;
}

.site-footer a:hover {
  color: #fff;
}

.site-footer__grid {
  display: block;
  
  margin-bottom: 32px;
}

@media (min-width: 768px) {
  .site-footer__grid {
    grid-template-columns: minmax(240px, 1.6fr) repeat(3, minmax(130px, 1fr));
    
  }
}

.site-footer__brand {
  display: flex;
  align-items: center;
  
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

.site-footer__brand img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
}

.site-footer__company {
  margin-top: 16px;
  color: rgba(255, 255, 255, 0.55);
  font-size: 13px;
}

.site-footer__links-title {
  color: #fff;
  font-weight: 600;
  margin-bottom: 12px;
}

.site-footer__links a {
  display: block;
  margin-bottom: 8px;
}

.site-footer__links p:not(.site-footer__links-title) {
  line-height: 1.8;
}

.site-footer__bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  display: flex;
  flex-wrap: wrap;
  
  justify-content: space-between;
}

.site-footer__bottom a:hover {
  text-decoration: underline;
}

/* 内容体系 · 分级四模块（上下两行） */

.section--surface {
  background: #fff;
}

.audience-pair {
  margin-top: 48px;
}

.grade-modules {
  display: block;
  
}

.grade-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 16px;
  background: #fffaf2;
  border: 1px solid #ede0d1;
  border-radius: 22px;
  box-shadow: 0 2px 8px rgba(61, 64, 75, 0.06);
}

.grade-card__title {
  display: flex;
  align-items: center;
  
  margin: 4px 8px 6px;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.grade-card__title::before {
  content: "";
  flex-shrink: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, #ff8125 0%, #ffa154 45%, #ffbb7a 100%);
  box-shadow: 0 0 0 4px rgba(255, 132, 41, 0.12);
}

.grade-card__desc {
  margin: 0 8px 12px;
  color: #696e81;
  font-size: 14px;
  line-height: 1.6;
}

.grade-card img {
  width: 100%;
  height: auto;
  border-radius: 16px;
  background: #fff;
}

.content-points {
  display: block;
  
  margin-top: 32px;
}

.content-points .content-system__item {
  height: 100%;
  background: #ffffff;
  border: 1px solid #ede0d1;
  border-radius: 16px;
  box-shadow: 0 2px 8px rgba(61, 64, 75, 0.06);
}

@media (min-width: 768px) {
  .grade-modules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    
    align-items: stretch;
  }

  .content-points {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 767px) {
  .grade-card__title {
    font-size: 18px;
  }

  .hero__break {
    display: block;
  }
}


/* 仅 IE10/11 使用，避免影响 Chrome / Edge */
@media screen and (-ms-high-contrast: active), (-ms-high-contrast: none) {
  .mobile-nav { top: 72px; right: 0; bottom: 0; left: 0; }
  .container, .container--narrow {
    width: auto;
    margin-left: auto;
    margin-right: auto;
    padding-left: 24px;
    padding-right: 24px;
  }
  .container { max-width: 1168px; }
  .hero__qr-grid .hero-qr { display: inline-block; width: 140px; margin-right: 12px; vertical-align: top; }
  .hero-qr__box { width: 120px; height: 120px; }
  .showcase__item { margin-right: 16px; }
  .site-nav a { margin-left: 18px; }
}
@media screen and (min-width: 768px) and (-ms-high-contrast: active), screen and (min-width: 768px) and (-ms-high-contrast: none) {
  .features-grid .feature-card { display: inline-block; width: 31%; margin: 0 1% 16px; vertical-align: top; }
  .grade-modules .grade-card,
  .grid-2 > article { display: inline-block; width: 48%; margin: 0 0.7% 16px; vertical-align: top; }
  .content-points .content-system__item { display: inline-block; width: 23%; margin: 0 0.8% 12px; vertical-align: top; }
  .site-footer__grid > div { display: inline-block; width: 22%; margin-right: 2%; vertical-align: top; }
  .step { display: inline-block; width: 22%; vertical-align: top; }
}
@media screen and (min-width: 900px) and (-ms-high-contrast: active), screen and (min-width: 900px) and (-ms-high-contrast: none) {
  .hero__content { float: left; width: 52%; }
  .hero__visual { float: right; width: 42%; }
  .hero__layout { overflow: hidden; }
  .site-header__actions { float: right; }
}