:root {
  --mobile-bg: #060913;
  --mobile-surface: rgba(10, 14, 24, 0.94);
  --mobile-surface-soft: rgba(15, 20, 34, 0.78);
  --mobile-line: rgba(255, 255, 255, 0.08);
  --mobile-gold: #e6c97a;
  --mobile-gold-deep: #b8923e;
  --mobile-text: #f4f3ef;
  --mobile-text-soft: rgba(244, 243, 239, 0.72);
}

.mobile-site {
  display: none;
}

@media (max-width: 900px) {
  .page-shell > .site-header,
  .page-shell > main:not(.mobile-site),
  .page-shell > .site-footer,
  .page-shell > .mobile-dock {
    display: none !important;
  }

  .mobile-site {
    display: block;
    background: linear-gradient(180deg, #05070e 0%, #09111f 28%, #05070f 100%);
    color: var(--mobile-text);
  }

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

  .mobile-site button,
  .mobile-site a {
    color: inherit;
    font: inherit;
    text-decoration: none;
  }

  .mobile-site section {
    width: min(100% - 20px, 100%);
    margin: 0 auto;
  }

  .mobile-section-head {
    display: grid;
    gap: 10px;
    margin-bottom: 18px;
  }

  .mobile-section-head p {
    margin: 0;
    color: rgba(230, 201, 122, 0.92);
    font-family: "Manrope", sans-serif;
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
  }

  .mobile-section-head h2 {
    margin: 0;
    color: var(--mobile-text);
    font-family: "Manrope", sans-serif;
    font-size: clamp(1.44rem, 2vw + 1rem, 1.92rem);
    line-height: 1.08;
    letter-spacing: -0.04em;
  }

  .mobile-section-head h2 span {
    color: var(--mobile-gold);
  }

  .mobile-section-head.is-dark h2,
  .mobile-section-head.is-dark p {
    color: var(--mobile-text);
  }

  .mobile-section-head.is-dark p {
    color: rgba(230, 201, 122, 0.92);
  }

  .mobile-hero {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding: 12px 0 24px;
    background:
      radial-gradient(circle at 16% 10%, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0) 34%),
      linear-gradient(180deg, #eee8dc 0%, #e8e1d4 62%, #ddd4c4 100%);
  }

  .mobile-hero-photo {
    position: relative;
    order: 2;
    width: min(100% - 20px, 100%);
    height: 190px;
    min-height: 0;
    margin: 0 auto;
    overflow: hidden;
    border-radius: 26px;
    background: #d9d0c1;
    box-shadow: 0 18px 44px rgba(62, 52, 35, 0.16);
  }

  .mobile-hero-photo::after {
    content: "";
    position: absolute;
    inset: 0;
    background:
      linear-gradient(180deg, rgba(255, 255, 255, 0.04) 0%, rgba(235, 226, 211, 0.06) 42%, rgba(28, 24, 18, 0.16) 100%),
      radial-gradient(circle at center bottom, rgba(232, 205, 143, 0.16), rgba(232, 205, 143, 0) 46%);
  }

  .mobile-hero-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center 18%;
    transform: scale(1.02);
  }

  .mobile-hero-card {
    position: relative;
    order: 1;
    z-index: 2;
    width: min(100% - 20px, 100%);
    margin: 0 auto;
    padding: 18px 16px 18px;
    border-radius: 30px;
    background:
      linear-gradient(180deg, rgba(255, 255, 255, 0.72), rgba(255, 255, 255, 0.56)),
      radial-gradient(circle at top right, rgba(230, 201, 122, 0.22), rgba(230, 201, 122, 0) 42%);
    border: 1px solid rgba(255, 255, 255, 0.72);
    box-shadow: 0 26px 70px rgba(80, 64, 34, 0.2);
    backdrop-filter: blur(24px) saturate(1.18);
    -webkit-backdrop-filter: blur(24px) saturate(1.18);
  }

  .mobile-hero-card::after {
    content: none;
  }

  .mobile-hero-card::before {
    content: none;
  }

  .mobile-language {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px;
    border-radius: 999px;
    border: 1px solid rgba(24, 30, 45, 0.1);
    background: rgba(255, 255, 255, 0.42);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
  }

  .mobile-lang-button {
    min-width: 52px;
    height: 34px;
    padding: 0 12px;
    border: 0;
    border-radius: 999px;
    background: transparent;
    color: rgba(30, 38, 58, 0.74);
    font-family: "Manrope", sans-serif;
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }

  .mobile-lang-button.is-active {
    background: linear-gradient(135deg, #f2d391, var(--mobile-gold));
    color: #182033;
    box-shadow: 0 8px 20px rgba(184, 146, 62, 0.18);
  }

  .mobile-kicker {
    margin: 12px 0 8px;
    color: rgba(131, 100, 42, 0.82);
    font-family: "Manrope", sans-serif;
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.16em;
    text-transform: uppercase;
  }

  .mobile-hero-card h1 {
    margin: 0;
    color: #172033;
    font-family: "Manrope", sans-serif;
    max-width: 11.8em;
    font-size: clamp(1.28rem, 2.4vw + 0.68rem, 1.58rem);
    line-height: 1.12;
    letter-spacing: -0.04em;
    overflow-wrap: anywhere;
  }

  html[data-language="zh"] .mobile-hero-card h1 {
    font-family: "STKaiti", "Kaiti SC", "KaiTi", "Noto Serif SC", serif;
    line-height: 1.12;
    letter-spacing: 0.01em;
  }

  .mobile-hero-lead {
    margin: 12px 0 0;
    max-width: 18.8rem;
    color: rgba(35, 44, 64, 0.7);
    font-size: 0.78rem;
    line-height: 1.68;
    overflow-wrap: anywhere;
  }

  .mobile-hero-actions {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    margin-top: 14px;
  }

  .mobile-hero-actions a {
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 18px;
    font-family: "Manrope", sans-serif;
    font-size: 0.96rem;
    font-weight: 800;
  }

  .mobile-hero-actions a:first-child {
    background: linear-gradient(135deg, #f2d391, var(--mobile-gold));
    color: #182033;
    box-shadow: 0 14px 28px rgba(184, 146, 62, 0.22);
  }

  .mobile-hero-actions a:last-child {
    border: 1px solid rgba(24, 30, 45, 0.12);
    background: rgba(255, 255, 255, 0.32);
    color: #172033;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
  }

  .mobile-proof,
  .mobile-focus,
  .mobile-research,
  .mobile-publications,
  .mobile-honors,
  .mobile-materials {
    padding: 26px 0 0;
  }

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

  .mobile-stat-grid article {
    min-height: 176px;
    display: grid;
    align-content: start;
    gap: 8px;
    padding: 18px 16px;
    border-radius: 22px;
    background:
      linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.02)),
      radial-gradient(circle at top right, rgba(214, 177, 92, 0.14), rgba(214, 177, 92, 0) 34%);
    border: 1px solid var(--mobile-line);
  }

  .mobile-stat-grid strong {
    color: var(--mobile-gold);
    font-family: "Manrope", sans-serif;
    font-size: 2rem;
    font-weight: 800;
    line-height: 1;
  }

  .mobile-stat-grid span {
    color: var(--mobile-text);
    font-family: "Manrope", sans-serif;
    font-size: 0.86rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
  }

  .mobile-stat-grid p {
    margin: 0;
    color: var(--mobile-text-soft);
    font-size: 0.88rem;
    line-height: 1.64;
  }

  .mobile-timeline {
    display: grid;
    gap: 14px;
  }

  .mobile-timeline-item {
    width: 100%;
    display: grid;
    gap: 14px;
    padding: 0;
    overflow: hidden;
    border: 1px solid var(--mobile-line);
    border-radius: 24px;
    background: linear-gradient(180deg, rgba(13, 17, 29, 0.96), rgba(7, 10, 18, 0.98));
    text-align: left;
  }

  .mobile-timeline-item span {
    position: absolute;
    z-index: 2;
    margin: 14px;
    min-width: 42px;
    height: 30px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 10px;
    border-radius: 999px;
    background: rgba(8, 11, 21, 0.72);
    color: var(--mobile-gold);
    font-family: "Manrope", sans-serif;
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.1em;
  }

  .mobile-timeline-item img {
    width: 100%;
    height: 222px;
    object-fit: cover;
    background: #0b1020;
  }

  .mobile-timeline-item strong,
  .mobile-timeline-item p {
    padding: 0 16px;
  }

  .mobile-timeline-item strong {
    color: var(--mobile-text);
    font-family: "Manrope", sans-serif;
    font-size: 1.14rem;
    line-height: 1.16;
    letter-spacing: -0.03em;
  }

  .mobile-timeline-item p {
    margin: -4px 0 18px;
    color: var(--mobile-text-soft);
    font-size: 0.92rem;
    line-height: 1.68;
  }

  .mobile-timeline-item:nth-child(2) img,
  .mobile-timeline-item:nth-child(3) img,
  .mobile-timeline-item:nth-child(4) img,
  .mobile-timeline-item:nth-child(5) img,
  .mobile-timeline-item:nth-child(6) img {
    object-fit: contain;
    padding: 14px;
  }

  .mobile-research-carousel {
    position: relative;
    aspect-ratio: 1 / 1.04;
    overflow: hidden;
    border-radius: 24px;
    background: #0a0d18;
    border: 1px solid var(--mobile-line);
  }

  .mobile-research-carousel img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transform: scale(1.04);
    transition: opacity 900ms ease, transform 3200ms ease;
  }

  .mobile-research-carousel img.is-active {
    opacity: 1;
    transform: scale(1);
  }

  .mobile-research-text {
    margin-top: 16px;
    display: grid;
    gap: 14px;
    color: var(--mobile-text-soft);
    font-size: 0.94rem;
    line-height: 1.74;
  }

  .mobile-research-text p {
    margin: 0;
  }

  .mobile-paper-list {
    display: grid;
    gap: 12px;
  }

  .mobile-paper-list button {
    width: 100%;
    display: grid;
    gap: 8px;
    padding: 16px;
    border-radius: 20px;
    border: 1px solid var(--mobile-line);
    background: rgba(255, 255, 255, 0.03);
    text-align: left;
  }

  .mobile-paper-list span {
    color: var(--mobile-gold);
    font-family: "Manrope", sans-serif;
    font-size: 0.74rem;
    font-weight: 800;
    letter-spacing: 0.12em;
  }

  .mobile-paper-list strong {
    color: var(--mobile-text);
    font-size: 1rem;
    line-height: 1.4;
  }

  .mobile-paper-list em {
    color: var(--mobile-text-soft);
    font-style: normal;
    font-size: 0.86rem;
  }

  .mobile-honor-wall {
    display: grid;
    gap: 14px;
  }

  .mobile-honor-wall button {
    width: 100%;
    display: grid;
    gap: 0;
    overflow: hidden;
    border: 1px solid var(--mobile-line);
    border-radius: 24px;
    background: linear-gradient(180deg, rgba(13, 17, 29, 0.96), rgba(7, 10, 18, 0.98));
    text-align: left;
  }

  .mobile-honor-wall img {
    width: 100%;
    height: 216px;
    object-fit: cover;
    background: #0a0d18;
  }

  .mobile-honor-wall button:nth-child(2) img,
  .mobile-honor-wall button:nth-child(3) img,
  .mobile-honor-wall button:nth-child(6) img {
    object-fit: contain;
    padding: 12px;
  }

  .mobile-honor-wall strong {
    padding: 16px;
    color: var(--mobile-text);
    font-family: "Manrope", sans-serif;
    font-size: 1rem;
    line-height: 1.4;
  }

  .mobile-material-grid {
    display: grid;
    gap: 12px;
  }

  .mobile-material-grid button,
  .mobile-material-grid a {
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 0 16px;
    border-radius: 18px;
    border: 1px solid var(--mobile-line);
    background: rgba(255, 255, 255, 0.03);
  }

  .mobile-material-grid span {
    font-size: 0.94rem;
    font-weight: 700;
  }

  .mobile-material-grid small {
    color: rgba(230, 201, 122, 0.94);
    font-family: "Manrope", sans-serif;
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
  }
}

@media (max-width: 640px) {
  .mobile-hero-photo {
    height: 176px;
    min-height: 0;
  }

  .mobile-hero-card h1 {
    font-size: 1.34rem;
  }

  .mobile-stat-grid {
    grid-template-columns: 1fr;
  }

  .mobile-stat-grid article {
    min-height: 0;
  }
}