/* 正式页面复用已确认的原型样式，仅补充真实媒体、正文和原生表单。 */
.site-brand-mark { background: transparent; color: var(--green); border: 0; border-radius: 0; width: 40px; height: 40px; }
.site-brand-mark::after { content: none; }
.header .brand { min-width: 0; flex-shrink: 1; }
.header .site-brand-mark, .header-tools { flex-shrink: 0; }
.site-brand-copy { min-width: 0; max-width: 260px; }
.site-brand-copy strong { display: block; }
.site-brand-copy strong, .site-brand-copy small {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.milo-mark { display: block; width: 100%; height: 100%; }
/* 账号入口沿用正式品牌；手机端优先呈现登录表单。 */
.auth-layout {
  grid-template-columns: minmax(0, 1fr) minmax(0, 430px);
  max-width: 1040px;
  gap: 80px;
  margin: 64px auto;
}
.auth-brand { display: flex; align-items: center; gap: 16px; }
.auth-brand-mark { width: 56px; height: 56px; flex: 0 0 56px; color: var(--green); }
.auth-story .auth-brand h2 { margin: 0; font-size: 27px; line-height: 1.3; }
.auth-story .auth-statement {
  margin: 32px 0 0;
  font-size: 30px;
  line-height: 1.4;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.auth-story .auth-description { margin: 20px 0 0; font-size: 16px; line-height: 1.75; color: var(--ink); }
.auth-alpha-note { margin-top: 30px; }
.auth-alpha-note p { margin: 0 0 8px; font-size: 14px; line-height: 1.6; }
.auth-alpha-note a { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; }
.auth-layout .form-card { padding: 34px; border: 0; }
.auth-layout .form-card h1 { font-size: 28px; line-height: 1.35; }
.auth-layout .auth-form-intro { margin: 12px 0 0; font-size: 16px; line-height: 1.6; color: var(--muted); }
.auth-layout .field label, .auth-layout .form-foot { font-size: 14px; }
.auth-layout .field input { font-size: 16px; }
.auth-layout .form-foot { margin-top: 16px; }
.auth-layout .form-foot a { display: inline-flex; align-items: center; min-height: 32px; }
.auth-layout .btn { font-size: 16px; }
@media (max-width: 900px) {
  .auth-layout { gap: 40px; grid-template-columns: minmax(0, 1fr) minmax(0, 380px); }
  .auth-story .auth-brand h2 { font-size: 24px; }
  .auth-story .auth-statement { font-size: 26px; }
}
@media (max-width: 700px) {
  .auth-layout { grid-template-columns: minmax(0, 1fr); max-width: 440px; margin: 24px auto 40px; gap: 36px; }
  .auth-layout .form-card { order: -1; padding: 26px 22px; }
  .auth-layout .form-card h1 { font-size: 24px; }
  .auth-brand-mark { width: 40px; height: 40px; flex-basis: 40px; }
  .auth-story .auth-brand h2 { font-size: 22px; }
  .auth-story .auth-statement { margin-top: 20px; font-size: 24px; }
  .auth-story .auth-description { margin-top: 14px; }
  .auth-alpha-note { margin-top: 20px; }
}
.profile-monogram .milo-mark { width: 64%; height: auto; margin: 0 auto; color: var(--green); }
.about-simple .profile-intro { align-items: start; }
.profile-copy .rich-content h2 { font-size: 24px; line-height: 1.4; }
.social-platform-icon svg { display: block; width: 24px; height: 24px; fill: currentColor; }
.social-account .social-sample { font-size: 10px; color: var(--muted); }
.social-dialog-open { overflow: hidden; }
.social-dialog {
  width: min(420px, calc(100% - 32px)); max-height: calc(100dvh - 32px);
  margin: auto; padding: 36px 30px 30px; border: 1px solid var(--line);
  border-radius: 16px; background: var(--surface); color: var(--ink);
  box-shadow: 0 24px 80px #0003; text-align: center; overflow-y: auto;
}
.social-dialog::backdrop { background: #10251dc0; }
.social-dialog-close {
  position: absolute; right: 12px; top: 12px; width: 40px; height: 40px;
  display: grid; place-items: center; padding: 0; border: 0; border-radius: 50%;
  color: var(--muted); background: transparent;
}
.social-dialog-close:hover { color: var(--ink); background: var(--soft); }
.social-dialog-heading .social-platform-icon { margin: 0 auto 14px; width: 48px; height: 48px; }
.social-dialog-heading h2 { margin: 0 0 3px; font-size: 25px; }
.social-dialog-heading p { margin: 0; color: var(--muted); overflow-wrap: anywhere; }
.social-dialog .social-sample { margin: 14px 0 0; color: var(--green); font-size: 12px; }
.social-qr {
  display: block; width: 240px; height: 240px; max-width: 100%; object-fit: contain;
  margin: 22px auto 0; padding: 10px; background: #fff; border: 1px solid #e1e6de; border-radius: 8px;
}
.social-dialog-help { margin: 18px 0 22px; font-size: 13px; line-height: 1.75; color: var(--muted); overflow-wrap: anywhere; }
.social-dialog-link { width: 100%; justify-content: center; }
.social-noscript { display: flex; flex-wrap: wrap; gap: 24px; }
.social-noscript figure { margin: 20px 0; max-width: 260px; }
.social-noscript figcaption { margin-top: 12px; }
@media (max-width: 480px) { .social-dialog { padding: 32px 22px 24px; } }
[hidden] {
  display: none !important;
}
.site-logout {
  margin: 0;
}
.site-note-cover {
  display: block;
  width: 100%;
  height: 162px;
  object-fit: cover;
  border-radius: 7px;
}
.featured-post .site-note-cover {
  height: 210px;
}
.site-course-cover {
  display: block;
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-radius: 7px;
}
.site-cover-placeholder {
  height: 162px;
  min-height: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.site-cover-placeholder strong {
  font-size: 27px;
  font-weight: 500;
}
.note-inline-image {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin-top: 18px;
}
.site-portrait {
  object-fit: cover;
  width: 100%;
  height: auto;
}
.translation-note {
  display: block;
  color: var(--muted);
  font-size: 11px;
  margin-top: 15px;
}
.rich-content {
  overflow-wrap: anywhere;
  line-height: 1.95;
}
.rich-content p {
  margin: 0 0 16px;
}
.rich-content h2,
.rich-content h3 {
  margin: 28px 0 15px;
}
.rich-content ul,
.rich-content ol {
  padding-left: 24px;
}
.rich-content pre {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  background: var(--soft);
  padding: 18px;
  border-radius: 7px;
}
.rich-content a {
  text-decoration: underline;
  text-underline-offset: 3px;
  color: var(--green);
}
.rich-content blockquote {
  margin: 22px 0;
  padding: 18px 24px;
  background: var(--soft);
  border-radius: 8px;
}
.rich-content table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  font-size: 14px;
  margin: 20px 0;
}
.rich-content th,
.rich-content td {
  padding: 12px 17px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  min-width: 100px;
}
.rich-content thead {
  background: var(--soft);
}
.site-pagination {
  display: flex;
  justify-content: center;
  gap: 30px;
  padding: 30px 0;
  color: var(--muted);
  font-size: 13px;
}
.site-policy {
  margin: 17px 0;
  font-size: 13px;
}
.site-policy summary {
  cursor: pointer;
}
.site-policy p {
  margin-top: 12px;
}
.site-plan-label {
  font-size: 16px;
  margin-top: 24px;
}
.site-empty-policy {
  margin-top: 30px;
}
.site-form-shell {
  max-width: 650px;
  margin: 60px auto;
}
.site-form-shell h1 {
  font-size: 32px;
  margin-bottom: 28px;
}
.site-form-shell form p {
  margin: 20px 0;
}
.site-form-shell label {
  display: block;
  font-size: 13px;
  margin-bottom: 8px;
}
.site-form-shell input:not([type="hidden"]):not([type="checkbox"]) {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 7px;
  color: var(--ink);
  font: inherit;
}
.site-form-shell button[type="submit"] {
  background: var(--green);
  color: var(--on-green);
  padding: 12px 24px;
  border: 0;
  border-radius: 8px;
  min-height: 45px;
  cursor: pointer;
}
.site-form-shell .errorlist {
  color: var(--ink);
  background: var(--soft);
  padding: 15px 30px;
  border-radius: 7px;
  font-size: 13px;
}
.site-form-shell .helptext {
  font-size: 12px;
  color: var(--muted);
}
.alpha-feature-section > p {
  font-size: 13px;
  line-height: 1.9;
  margin-bottom: 20px;
}
/* 账号与个人中心：沿用原型 form-card / status-panel / account-layout，只补充真实表单状态。 */
.field-errors {
  list-style: none;
  margin: 7px 0 0;
  padding: 0;
  font-size: 12px;
  color: var(--ink);
}
.field.has-error input {
  border-color: var(--ink);
}
.account-message {
  margin: 18px 0;
  text-align: left;
}
.status-panel .account-message {
  margin: 20px auto 0;
  max-width: 460px;
}
.status-panel .actions form {
  display: inline-flex;
}
.account-verify-notice {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 18px;
  margin: 0 0 24px;
}
.account-empty h2 {
  font-size: 21px;
}
.account-empty p {
  color: var(--muted);
  font-size: 14px;
  margin: 10px 0 22px;
}
.account-profile-row {
  align-items: flex-start;
}
.account-name-form {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  min-width: 0;
  width: min(100%, 340px);
}
.account-name-form .field {
  flex: 1;
  min-width: 0;
  margin: 0;
}
.account-name-form .btn {
  min-height: 47px;
}
@media (max-width: 700px) {
  .site-note-cover,
  .site-cover-placeholder {
    height: 108px;
  }
  .featured-post .site-note-cover {
    height: 180px;
  }
  .site-course-cover {
    height: 185px;
  }
  .site-form-shell {
    max-width: calc(100% - 40px);
    margin: 35px auto;
  }
  .site-cover-placeholder strong {
    font-size: 16px;
  }
  .account-profile-row {
    flex-direction: column;
    align-items: stretch;
  }
  .account-name-form {
    width: 100%;
  }
}
/* 课程目录与课堂：沿用原型 course-detail / lesson-layout / exercise，只补充真实目录、受限与进度状态。 */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}
.course-length {
  font-size: 13px;
  color: var(--muted);
}
.course-aside-links {
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 18px;
}
.lesson-section {
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  margin: 26px 0 2px;
}
.lesson-row div small {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: var(--muted);
}
.lesson-outline-section {
  margin: 18px 12px 2px;
  font-size: 11px;
  color: var(--muted);
}
.lesson-sidebar .lesson-outline a {
  align-items: flex-start;
}
.lesson-outline-state {
  margin-left: auto;
  font-size: 10px;
  color: var(--muted);
  white-space: nowrap;
}
.lesson-outline-state .icon {
  width: 14px;
  height: 14px;
  color: var(--green);
}
.lesson-sidebar .lesson-account-link {
  display: inline-flex;
  padding: 4px 0;
  margin-top: 18px;
}
.lesson-outline-toggle {
  display: none;
}
.lesson-media-note {
  margin: 0;
  padding: 13px 17px;
  border: 1px dashed var(--line);
  border-radius: 5px;
  font-size: 13px;
  color: var(--muted);
}
.lesson-video video {
  display: block;
  width: 100%;
  border-radius: 5px;
  background: #000;
}
.exercise h2 {
  margin-top: 16px;
}
.lesson-reference {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.lesson-reference summary {
  cursor: pointer;
  font-size: 14px;
  color: var(--green);
}
.lesson-body .lesson-reference > p {
  margin: 12px 0;
  font-size: 12px;
}
.lesson-done {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.lesson-done .icon {
  width: 14px;
  height: 14px;
}
.lesson-save-hint,
.lesson-body .lesson-save-hint {
  font-size: 12px;
  color: var(--muted);
}
.lesson-body > .lesson-save-hint {
  margin-top: 10px;
  text-align: right;
}
.lesson-progress-status,
.lesson-course-complete {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 18px;
}
.lesson-course-complete .actions {
  gap: 18px;
}
.lesson-locked {
  margin: 30px 0;
  padding: 27px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 5px;
}
.lesson-locked h2 {
  font-size: 24px;
  margin: 16px 0 10px;
}
.lesson-locked p {
  margin-bottom: 20px;
  font-size: 14px;
  color: var(--muted);
}
.lesson-locked .actions {
  flex-wrap: wrap;
  gap: 12px 20px;
}
.lesson-locked .lesson-locked-note {
  margin: 22px 0 0;
  font-size: 12px;
}
.lesson-pager {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  margin-top: 35px;
}
.lesson-pager .text-link {
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
}
.lesson-pager small {
  font-size: 12px;
  color: var(--muted);
}
@media (max-width: 620px) {
  .lesson-sidebar .lesson-outline-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 12px 14px;
    background: var(--soft);
    border: 1px solid var(--line);
    border-radius: 5px;
    color: var(--ink);
    font-size: 13px;
  }
  .lesson-outline-toggle small {
    color: var(--muted);
  }
  .lesson-sidebar.is-collapsible .lesson-outline {
    display: block;
    overflow: visible;
    margin-top: 6px;
  }
  .lesson-sidebar.is-collapsible:not(.is-open) .lesson-outline {
    display: none;
  }
  .lesson-sidebar.is-collapsible .lesson-outline a {
    padding: 12px 10px;
    font-size: 12px;
  }
  .lesson-locked {
    padding: 21px;
  }
  .lesson-pager .btn {
    width: 100%;
  }
}
.study-course + .study-course {
  margin-top: 25px;
}
.study-course-cover {
  overflow: hidden;
}
.study-course-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.lesson-progress-status button {
  background: none;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  color: inherit;
  font: inherit;
  cursor: pointer;
}
/* 订阅与账单（B4）：沿用原型 panel / status-panel / notice 结构，只补充布局 */
.subscription-price form {
  margin: 0;
}
.subscription-price .muted + .muted {
  margin-top: 6px;
}
.plan-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
}
.checkout-result h1 {
  margin-top: 20px;
}
.checkout-result .actions {
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
}
.checkout-result form {
  margin: 0;
}
.billing-notice {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 18px;
  margin-bottom: 20px;
}
.billing-plan + .billing-plan,
.billing-section-title + .billing-plan {
  margin-top: 20px;
}
.billing-section-title {
  margin: 35px 0 0;
  font-size: 20px;
}
.billing-plan h2 {
  margin: 16px 0 6px;
  font-size: 24px;
}
.billing-plan .billing-price {
  font-size: 14px;
}
.billing-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 14px 24px;
  margin: 22px 0;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.billing-facts dt {
  font-size: 12px;
  color: var(--muted);
}
.billing-facts dd {
  margin: 4px 0 0;
  font-size: 14px;
}
.billing-manage {
  margin: 0 0 26px;
}
.billing-manage p,
.billing-note {
  margin-top: 10px;
  font-size: 12px;
  color: var(--muted);
}
.billing-plan h3 {
  margin-top: 8px;
}
.billing-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.billing-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 18px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}
.billing-list li > div:first-child {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}
.billing-list small {
  font-size: 12px;
  color: var(--muted);
  overflow-wrap: anywhere;
}
.billing-states {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
}
.billing-plan .empty {
  padding: 20px 0 5px;
}
.checkout-result .checkout-recheck-note {
  margin-top: 12px;
  font-size: 13px;
}
.billing-notice-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
}
.billing-notice-actions form {
  margin: 0;
}
.billing-notice-actions button {
  background: none;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  padding: 0;
  color: inherit;
  font: inherit;
  cursor: pointer;
}
/* 视频：卡片网格；详情页 16:9 播放器 + 右侧章节，下方摘要与按章节分段的文字稿（时间点可跳转）。 */
.video-index {
  padding-bottom: 60px;
}
.video-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 38px 28px;
}
.video-card {
  min-width: 0;
}
.video-card-cover {
  position: relative;
  display: block;
  aspect-ratio: 16 / 9;
  border-radius: 10px;
  overflow: hidden;
  background: var(--soft);
}
.video-card-cover img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.25s;
}
.video-card:hover .video-card-cover img {
  transform: scale(1.02);
}
.video-card-placeholder {
  display: flex;
  height: 100%;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.2em;
}
.video-duration {
  position: absolute;
  right: 10px;
  bottom: 10px;
  padding: 1px 7px;
  border-radius: 4px;
  background: #000000b8;
  color: #fff;
  font-size: 12px;
  line-height: 1.6;
  font-variant-numeric: tabular-nums;
}
.video-card-copy {
  padding-top: 16px;
}
.video-card-copy .stream-meta {
  margin-bottom: 8px;
}
.video-card h2,
.video-card h3 {
  font: 500 18px/1.55 var(--sans);
  letter-spacing: -0.01em;
  margin: 0 0 8px;
}
.video-card h2 a:hover,
.video-card h3 a:hover {
  color: var(--green);
}
.video-card p {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}
.video-heading {
  max-width: 900px;
  padding: 36px 0 24px;
}
.video-heading .breadcrumbs {
  margin-bottom: 16px;
}
.video-heading h1 {
  font: 500 clamp(24px, 3vw, 36px)/1.45 var(--sans);
  letter-spacing: -0.03em;
}
.video-meta {
  gap: 16px;
  margin: 14px 0 0;
  font-size: 12px;
  color: var(--muted);
}
.video-meta time {
  font-size: 12px;
}
.video-stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 24px;
}
.video-stage.no-chapters {
  grid-template-columns: minmax(0, 1fr);
}
.video-frame {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: 12px;
  background: #000;
}
.video-player {
  display: block;
  width: 100%;
  height: 100%;
  background: #000;
}
/* 章节栏高度跟随播放器，内容超出时在栏内滚动。 */
.video-chapters {
  height: 0;
  min-height: 100%;
  overflow-y: auto;
  padding: 18px 8px 8px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
}
.video-chapters h2 {
  padding: 0 12px 10px;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
}
.video-chapters ol {
  list-style: none;
  margin: 0;
  padding: 0;
}
.video-chapters a {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 8px;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 13px;
  line-height: 1.6;
}
.video-chapters a:hover,
.video-chapters a[aria-current="true"] {
  background: var(--soft);
}
.video-chapters a[aria-current="true"] span {
  color: var(--green);
}
.video-chapters .chapter-time,
.video-time {
  color: var(--green);
  font-variant-numeric: tabular-nums;
}
.video-body {
  max-width: 760px;
  padding: 36px 0 20px;
}
.video-summary {
  font-size: 16px;
  line-height: 1.9;
}
.video-description {
  margin-top: 20px;
  font-size: 14px;
  color: var(--muted);
}
.video-transcript {
  margin-top: 44px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}
.video-transcript h2 {
  font: 500 23px/1.5 var(--sans);
  letter-spacing: -0.015em;
  margin-bottom: 8px;
}
.video-transcript h3 {
  font: 500 17px/1.6 var(--sans);
  margin: 28px 0 12px;
}
.video-transcript p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 2;
  overflow-wrap: anywhere;
}
.video-time {
  display: inline-block;
  min-width: 44px;
  margin-right: 10px;
  font-size: 12px;
}
.video-time:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}
.video-related {
  margin-top: 30px;
  padding: 40px 0 70px;
  border-top: 1px solid var(--line);
}
.video-related .video-card h3 {
  font-size: 16px;
}
@media (max-width: 1000px) {
  .video-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .video-stage {
    grid-template-columns: minmax(0, 1fr);
  }
  .video-chapters {
    height: auto;
    min-height: 0;
    max-height: 360px;
  }
}
@media (max-width: 620px) {
  .video-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }
  .video-heading {
    padding: 24px 0 18px;
  }
  .video-frame {
    margin: 0 -20px;
    border-radius: 0;
  }
  .video-body {
    padding-top: 26px;
  }
  .video-transcript p {
    font-size: 14px;
  }
}
/* 区块标题（首页 H1 可在后台改写）长度不定：折行时各行均分，避免末字单独成行；右侧链接不折行。 */
.quiet-section-head :is(h1, h2) {
  text-wrap: balance;
}
.quiet-section-head > .text-link {
  flex-shrink: 0;
  white-space: nowrap;
}
/* 首页视频区：最新一个横向大卡，其后三个卡片。 */
.home-videos {
  margin-bottom: 65px;
}
.video-card-featured {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  gap: 40px;
  align-items: center;
}
.video-card-featured .video-card-cover {
  border-radius: 12px;
}
.video-card-featured .video-card-copy {
  padding-top: 0;
}
.video-card-featured h2 {
  font-size: 26px;
  line-height: 1.45;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}
.video-card-featured p {
  -webkit-line-clamp: 4;
  font-size: 14px;
  line-height: 1.9;
  margin-bottom: 18px;
}
.home-video-grid {
  margin-top: 44px;
}
@media (max-width: 850px) {
  .video-card-featured {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }
  .video-card-featured .video-card-copy {
    padding-top: 18px;
  }
  .video-card-featured h2 {
    font-size: 22px;
  }
}

/* Milo Alpha 正式介绍：原生视频、可直达章节和会员访问说明。 */
.alpha-product-intro {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.3fr);
  gap: 52px;
  align-items: center;
  padding: 62px 0 28px;
}
.alpha-product-intro h1 {
  font: 400 clamp(40px, 4.6vw, 64px)/1.12 var(--display);
  letter-spacing: -0.035em;
}
.alpha-product-purpose {
  font-size: 24px;
  line-height: 1.5;
  margin: 18px 0;
  color: var(--ink);
}
.alpha-product-summary {
  font-size: 16px;
  line-height: 1.9;
  max-width: 34em;
}
.alpha-product-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px 24px;
  margin-top: 28px;
}
.alpha-product-video {
  min-width: 0;
  margin: 0;
}
.alpha-product-video-frame {
  position: relative;
}
.alpha-play-trigger {
  position: absolute;
  right: 18px;
  bottom: 18px;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 13px 18px;
  min-height: 48px;
  border: 0;
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink);
  font-size: 14px;
  font-weight: 500;
}
.alpha-play-trigger:hover {
  opacity: 0.9;
}
.alpha-tour-video {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  border-radius: 12px;
  background: var(--ink);
}
.alpha-product-video figcaption {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 20px;
  margin-top: 12px;
  font-size: 13px;
  color: var(--muted);
}
.alpha-product-video figcaption a {
  color: var(--green);
  text-decoration: underline;
  text-underline-offset: 4px;
}
.alpha-workflow {
  margin-top: 76px;
}
.alpha-workflow-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px 48px;
  margin-bottom: 36px;
}
.alpha-workflow h2,
.alpha-membership h2 {
  font-size: 28px;
  line-height: 1.4;
}
.alpha-workflow-heading > p {
  max-width: 28em;
  font-size: 15px;
}
.alpha-workflow-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 36px 64px;
  padding: 0;
  margin: 0;
}
.alpha-workflow-list h3 {
  font-size: 21px;
  line-height: 1.5;
}
.alpha-workflow-list h3 a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  padding: 6px 0;
  color: var(--green);
}
.alpha-workflow-list h3 a:hover > span:first-child,
.alpha-workflow-list h3 a[aria-current="true"] > span:first-child {
  text-decoration: underline;
  text-underline-offset: 5px;
}
.alpha-chapter-time {
  flex: none;
  font: 400 14px var(--sans);
  font-variant-numeric: tabular-nums;
}
.alpha-workflow-list p {
  font-size: 16px;
  line-height: 1.85;
  margin-top: 8px;
  max-width: 36em;
}
.alpha-membership {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px 48px;
  margin: 80px 0 20px;
  padding: 36px;
  background: var(--soft);
  border-radius: 12px;
}
.alpha-membership p {
  max-width: 43em;
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.85;
}
.alpha-membership .alpha-product-actions {
  flex-shrink: 0;
  margin-top: 0;
}
.home-alpha-product .home-alpha-copy h2 {
  margin: 0 0 14px;
}
.home-alpha-product .home-alpha-copy > .alpha-product-purpose {
  color: var(--ink);
  font-size: 21px;
  margin: 0 0 16px;
}
.home-alpha-product .home-alpha-copy > p,
.home-alpha-product .home-alpha-copy > ul {
  color: var(--ink);
  font-size: 15px;
}
.home-alpha-product .home-alpha-copy > small {
  font-size: 13px;
}
@media (max-width: 1000px) {
  .alpha-product-intro {
    gap: 32px;
  }
  .alpha-workflow-heading,
  .alpha-membership {
    align-items: flex-start;
    flex-direction: column;
  }
}
@media (max-width: 760px) {
  .alpha-product-intro {
    grid-template-columns: minmax(0, 1fr);
    padding-top: 36px;
  }
  .alpha-product-purpose {
    font-size: 21px;
  }
  .alpha-workflow {
    margin-top: 48px;
  }
  .alpha-workflow h2,
  .alpha-membership h2 {
    font-size: 25px;
  }
  .alpha-workflow-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }
  .alpha-membership {
    padding: 26px;
    margin-top: 52px;
  }
  .alpha-play-trigger {
    right: 12px;
    bottom: 12px;
    min-height: 44px;
    padding: 11px 14px;
    font-size: 13px;
  }
}