:root {
      --blue: #0477f1;
      --deep-blue: #3c5cb3;
      --ink: #111;
      --muted: #555;
      --soft: #f9fafc;
      --wide: min(1805px, calc(100vw - 100px));
      --about-copy: min(1401px, calc(100vw - 160px));
      --about-culture: min(1608px, calc(100vw - 207px));
      --about-contact: min(1605px, calc(100vw - 207px));
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      min-width: 0;
      overflow-x: hidden;
      background: var(--soft);
      color: var(--ink);
      font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
    }

    a { color: inherit; text-decoration: none; }
    img { display: block; max-width: 100%; }

    .site-page {
      position: relative;
      overflow: hidden;
      background:
        linear-gradient(rgba(249, 250, 252, .82), rgba(249, 250, 252, .82)),
        url("/static/images/about-page-texture-bg.webp") center 547px / 2193px auto repeat-y;
    }

    .topbar {
      position: fixed;
      inset: 0 0 auto 0;
      z-index: 50;
      height: 100px;
      border-bottom: 1px solid rgba(255, 255, 255, .3);
      background: rgba(5, 15, 38, .58);
      backdrop-filter: blur(10px);
      transition: background .28s ease, border-color .28s ease, box-shadow .28s ease;
    }

    .topbar.is-light {
      border-bottom-color: rgba(26, 56, 120, .08);
      background: rgba(255, 255, 255, .96);
      box-shadow: 0 8px 24px rgba(20, 42, 78, .08);
      backdrop-filter: blur(12px);
    }

    .topbar-inner {
      height: 100%;
      display: flex;
      align-items: center;
      padding: 0 60px;
      gap: 120px;
    }

    .logo-wrap {
      position: relative;
      width: 290px;
      height: 29px;
      flex: 0 0 auto;
    }

    .logo {
      position: absolute;
      inset: 0;
      width: 290px;
      height: 29px;
      object-fit: contain;
      transition: opacity .24s ease;
    }

    .logo-blue { opacity: 0; }
    .topbar.is-light .logo-white { opacity: 0; }
    .topbar.is-light .logo-blue { opacity: 1; }

    .nav {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-left: 8px;
    }

    .nav a,
    .header-links a {
      position: relative;
      color: #fff;
      text-decoration: none;
      transition: color .22s ease, transform .22s ease;
    }

    .topbar.is-light .nav a,
    .topbar.is-light .header-links a { color: #111; }

    .nav a {
      font-size: 24px;
      line-height: 38.4px;
      white-space: nowrap;
    }

    .nav-deepvision { font-weight: 700; }

    .nav a.active { color: var(--blue); }
    .topbar.is-light .nav a.active,
    .topbar.is-light .header-links a:first-child { color: var(--deep-blue); }

    .nav a.active::after {
      content: "";
      position: absolute;
      left: 50%;
      bottom: -28px;
      width: 111px;
      height: 3px;
      background: var(--blue);
      transform: translateX(-50%);
    }

    .topbar.is-light .nav a.active::after {
      bottom: -31px;
      background: var(--deep-blue);
    }

    .nav a:hover,
    .header-links a:hover {
      color: #58a7ff;
      transform: translateY(-1px);
    }

    .header-links {
      margin-left: auto;
      display: flex;
      gap: 20px;
      align-items: center;
    }

    .header-links a {
      font-size: 16px;
      line-height: 25.6px;
      white-space: nowrap;
    }

    .header-links a:first-child {
      color: var(--blue);
      font-weight: 500;
    }

    .hero {
      position: relative;
      height: 547px;
      overflow: hidden;
      color: #fff;
      background: #07152b url("/static/images/about-hero-bg.webp") center top / cover no-repeat;
    }

    .hero::before {
      content: "";
      position: absolute;
      left: 0;
      right: 0;
      top: 98px;
      height: 453px;
      background: rgba(0, 0, 0, .1);
      backdrop-filter: blur(5px);
    }

    .hero-content {
      position: relative;
      z-index: 1;
      width: min(1385px, calc(100% - 520px));
      margin-left: 260px;
      padding-top: 194px;
    }

    .hero h1 {
      margin: 0;
      font-size: 48px;
      line-height: 67.2px;
      font-weight: 500;
      letter-spacing: 0;
    }

    .hero p {
      width: 800px;
      margin: 15px 0 0;
      color: rgba(255, 255, 255, .9);
      font-size: 24px;
      line-height: 40.8px;
      font-weight: 500;
    }

    .section-heading {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 15px;
    }

    .section-heading img {
      width: 40px;
      height: 23px;
      object-fit: contain;
      flex: 0 0 auto;
    }

    .section-heading h2 {
      margin: 0;
      color: #111;
      font-size: 48px;
      line-height: 76.8px;
      font-weight: 500;
      letter-spacing: 0;
      white-space: nowrap;
    }

    .company {
      background: #fff;
      padding: 70px 0 60px;
    }

    .company-copy {
      width: var(--about-copy);
      margin: 60px auto 0;
    }

    .company-copy p {
      margin: 0 0 45.6px !important;
      color: #555;
      font-size: 24px;
      line-height: 45.6px;
      font-weight: 400;
      text-align: justify;
      letter-spacing: 0;
    }

    .company-copy p:last-child {
      margin-bottom: 0;
    }

    .culture {
      padding: 60px 0;
    }

    .culture-grid {
      width: var(--about-culture);
      margin: 60px auto 0;
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 40px;
    }

    .culture-card {
      height: 316px;
      overflow: hidden;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      background: #fff;
      transition: transform .28s ease, border-color .28s ease;
    }

    .culture-card img {
      width: 100%;
      height: 105px;
      object-fit: cover;
      transition: transform .36s ease;
    }

    .culture-card h3 {
      margin: 15px 39px 0;
      color: #111;
      font-size: 32px;
      line-height: 51.2px;
      font-weight: 500;
      white-space: nowrap;
      transition: color .28s ease;
    }

    .culture-card p {
      width: min(455px, calc(100% - 78px));
      margin: 0 39px;
      color: #555;
      font-size: 20px;
      line-height: 40.8px;
      font-weight: 400;
    }

    .culture-card:hover {
      transform: translateY(-6px);
      border-color: #3c5cb3;
    }

    .culture-card:hover img {
      transform: scale(1.04);
    }

    .culture-card:hover h3 {
      color: var(--deep-blue);
    }

    .contact {
      background: #fff;
      padding: 60px 0;
    }

    .contact-layout {
      width: var(--about-contact);
      margin: 60px auto 0;
      display: grid;
      grid-template-columns: 894fr 575fr;
      gap: clamp(48px, 7.083vw, 136px);
      align-items: start;
    }

    .contact-panel-title {
      margin: 0;
      color: #111;
      font-size: 32px;
      line-height: 51.2px;
      font-weight: 500;
      white-space: nowrap;
    }

    .contact-title-rule {
      width: 40px;
      height: 3px;
      margin-top: 0;
      border-radius: 5px;
      background: var(--deep-blue);
    }

    .message-panel {
      position: relative;
      z-index: 2;
    }

    .message-form {
      padding-top: 24px;
      display: grid;
      gap: 16px;
    }

    .message-row {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 20px;
    }

    .message-form input,
    .message-form textarea,
    .consultation-select-trigger {
      width: 100%;
      border: 1px solid #ddd;
      border-radius: 8px;
      background: #f9f9fa;
      color: #333;
      font: 400 20px/normal Arial, "Microsoft YaHei", sans-serif;
      outline: none;
    }

    .message-form input,
    .consultation-select-trigger {
      height: 53px;
    }

    .message-form input {
      padding: 0 17px;
    }

    .consultation-select {
      position: relative;
    }

    .consultation-select-trigger {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 17px;
      color: #757575;
      text-align: left;
      cursor: pointer;
      transition: border-color .2s ease, box-shadow .2s ease, background .2s ease;
    }

    .consultation-select-trigger:hover {
      border-color: #3c5cb3;
    }

    .consultation-select-trigger:focus-visible,
    .consultation-select.is-open .consultation-select-trigger {
      border-color: #3c5cb3;
      box-shadow: 0 0 0 2px rgba(60, 92, 179, .12);
    }

    .consultation-select-value {
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }

    .consultation-select.has-value .consultation-select-value {
      color: #333;
    }

    .consultation-select-arrow {
      width: 19.7613px;
      height: 19.081px;
      flex: 0 0 auto;
      margin-left: 16px;
      transition: transform .2s ease;
    }

    .consultation-select.is-open .consultation-select-arrow {
      transform: rotate(180deg);
    }

    .consultation-select-popup {
      position: absolute;
      top: calc(100% + 8px);
      left: 0;
      right: 0;
      border: 1px solid #e5e6eb;
      border-radius: 8px;
      background: #fff;
      box-shadow: 0 4px 12px rgba(0, 0, 0, .12);
      padding: 4px;
      z-index: 30;
    }

    .consultation-select-popup[hidden] {
      display: none;
    }

    .consultation-option {
      position: relative;
      display: flex;
      align-items: center;
      width: 100%;
      height: 40px;
      padding: 0 40px 0 12px;
      border: 0;
      border-radius: 6px;
      background: transparent;
      color: #4e5969;
      font: 400 16px/40px "Noto Sans SC", "Microsoft YaHei", sans-serif;
      text-align: left;
      cursor: pointer;
      outline: none;
    }

    .consultation-option:hover,
    .consultation-option:focus-visible {
      background: #f2f3f5;
    }

    .consultation-option[aria-selected="true"] {
      background: #e8f3ff;
      color: #165dff;
      font-weight: 500;
    }

    .consultation-option[aria-selected="true"]::after {
      content: "✓";
      position: absolute;
      right: 14px;
      color: #165dff;
      font-size: 16px;
    }

    .message-form textarea {
      height: 122px;
      padding: 15px 17px;
      resize: none;
    }

    .message-form input::placeholder,
    .message-form textarea::placeholder {
      color: #757575;
      opacity: 1;
    }

    .message-form > button {
      width: 100%;
      height: 63px;
      margin-top: 4px;
      border: 0;
      border-radius: 8px;
      background: var(--deep-blue);
      color: #fff;
      font: 400 24px/normal Arial, "Microsoft YaHei", sans-serif;
      cursor: pointer;
      transition: background-color .2s ease, box-shadow .2s ease, transform .2s ease, opacity .2s ease;
    }

    .message-form > button:hover:not(:disabled),
    .message-form > button:focus-visible {
      background: #3152ad;
      box-shadow: 0 8px 20px rgba(60, 92, 179, .24);
    }

    .message-form > button:active:not(:disabled) {
      transform: translateY(1px);
    }

    .message-form > button:disabled {
      cursor: wait;
      opacity: .72;
    }

    .form-feedback {
      position: fixed;
      inset: 0;
      z-index: 10000;
      display: grid;
      place-items: center;
      padding: 24px;
      background: rgba(3, 14, 35, .56);
      -webkit-backdrop-filter: blur(6px);
      backdrop-filter: blur(6px);
      opacity: 0;
      transition: opacity .22s ease;
    }

    .form-feedback[hidden] {
      display: none;
    }

    .form-feedback.is-visible {
      opacity: 1;
    }

    .form-feedback-card {
      width: min(420px, calc(100vw - 32px));
      padding: 36px 32px 30px;
      border: 1px solid rgba(60, 92, 179, .14);
      border-radius: 18px;
      background: #fff;
      box-shadow: 0 24px 70px rgba(3, 14, 35, .24);
      text-align: center;
      transform: translateY(14px) scale(.98);
      transition: transform .22s ease;
    }

    .form-feedback.is-visible .form-feedback-card {
      transform: translateY(0) scale(1);
    }

    .form-feedback-icon {
      display: grid;
      place-items: center;
      width: 68px;
      height: 68px;
      margin: 0 auto 20px;
      border-radius: 50%;
      background: #edf3ff;
      color: #3c5cb3;
    }

    .form-feedback-icon svg {
      width: 38px;
      height: 38px;
      fill: none;
      stroke: currentColor;
      stroke-linecap: round;
      stroke-linejoin: round;
      stroke-width: 2.2;
    }

    .form-feedback .feedback-error-mark,
    .form-feedback.is-error .feedback-success-mark {
      display: none;
    }

    .form-feedback.is-error .feedback-error-mark {
      display: block;
    }

    .form-feedback.is-error .form-feedback-icon {
      background: #fff1f0;
      color: #d84a42;
    }

    .form-feedback h3 {
      margin: 0;
      color: #17233d;
      font: 600 26px/1.35 Arial, "Microsoft YaHei", sans-serif;
    }

    .form-feedback p {
      margin: 12px 0 26px;
      color: #667085;
      font: 400 16px/1.65 Arial, "Microsoft YaHei", sans-serif;
    }

    .form-feedback-close {
      min-width: 144px;
      height: 44px;
      padding: 0 28px;
      border: 0;
      border-radius: 8px;
      background: var(--deep-blue);
      color: #fff;
      font: 500 16px/44px Arial, "Microsoft YaHei", sans-serif;
      cursor: pointer;
      transition: background-color .2s ease, box-shadow .2s ease;
    }

    .form-feedback-close:hover,
    .form-feedback-close:focus-visible {
      background: #3152ad;
      box-shadow: 0 8px 20px rgba(60, 92, 179, .22);
    }

    @media (prefers-reduced-motion: reduce) {
      .form-feedback,
      .form-feedback-card {
        transition: none;
      }
    }

    .service-list {
      display: grid;
      gap: 0;
    }

    .service-item {
      display: grid;
      grid-template-columns: 44px minmax(0, 1fr);
      gap: 16px;
      padding-top: 24px;
    }

    .service-icon {
      position: relative;
      width: 44px;
      height: 44px;
      border-radius: 8px;
      background: #f0f4ff;
      overflow: hidden;
    }

    .service-icon span {
      position: absolute;
      left: 9px;
      top: 9px;
      width: 25px;
      height: 25px;
      overflow: hidden;
      pointer-events: none;
    }

    .service-icon img {
      position: absolute;
      width: 629.14%;
      height: 471.85%;
      max-width: none;
      top: -180.74%;
    }

    .service-icon.phone img { left: -192.72%; }
    .service-icon.location span { top: 8.8125px; }
    .service-icon.location img { left: -340.72%; }
    .service-icon.mail span { top: 9.8125px; }
    .service-icon.mail img { left: -491.76%; }

    .service-item h4 {
      margin: 0;
      color: #111;
      font-size: 24px;
      line-height: 38.4px;
      font-weight: 500;
    }

    .service-item strong {
      display: block;
      color: var(--deep-blue);
      font-size: 24px;
      line-height: 31.2px;
      font-weight: 700;
      white-space: nowrap;
    }

    .service-item p {
      margin: 0;
      color: #666;
      font-size: 20px;
      line-height: 32px;
      font-weight: 400;
    }

    .service-item h4 + p {
      padding-top: 6px;
    }

    .service-item:last-child {
      padding-bottom: 24px;
    }

    .service-item small {
      display: block;
      color: #888;
      font-size: 20px;
      line-height: 32px;
      font-weight: 400;
    }

    .reveal {
      opacity: 0;
      transform: translateY(28px);
      transition: opacity .64s ease, transform .64s ease;
      transition-delay: var(--delay, 0ms);
    }

    .reveal.is-visible {
      opacity: 1;
      transform: translateY(0);
    }

    .culture-card.reveal {
      transition: opacity .64s ease, transform .28s ease, border-color .28s ease;
    }

    .culture-card.reveal.is-visible:hover {
      transform: translateY(-6px);
    }

    @media (max-width: 1840px) {
      .topbar-inner { padding: 0 40px; gap: 70px; }
      .logo-wrap,
      .logo {
        width: 250px;
        height: 25px;
      }
      .nav { gap: 36px; }
      .nav a { font-size: 21px; }
      .hero-content {
        width: calc(100% - 320px);
        margin-left: 160px;
      }
    }


    @media (max-width: 1500px) {
      .topbar-inner {
        padding: 0 28px;
        gap: 34px;
      }
      .nav {
        gap: 24px;
        margin-left: 0;
      }
      .nav a {
        font-size: 18px;
        line-height: 30px;
      }
      .nav a.active::after {
        width: 86px;
        bottom: -32px;
      }
      .header-links { display: none; }
      .hero-content {
        width: calc(100% - 160px);
        margin-left: 80px;
      }
    }


    @media (max-width: 1180px) {
      :root {
        --about-copy: calc(100vw - 80px);
        --about-culture: calc(100vw - 80px);
        --about-contact: calc(100vw - 80px);
      }
      .topbar { height: 84px; }
      .topbar-inner { padding: 0 22px; gap: 24px; }
      .logo-wrap, .logo { width: 220px; height: 22px; }
      .nav {
        flex: 1 1 auto;
        justify-content: space-between;
        gap: 14px;
        overflow-x: visible;
      }
      .nav a { font-size: 16px; }
      .nav a.active::after,
      .topbar.is-light .nav a.active::after {
        bottom: -27px;
        width: 86px;
      }
      .header-links { display: none; }
      .hero-content {
        width: calc(100% - 80px);
        margin-left: 40px;
      }
      .culture-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }
      .contact-layout {
        grid-template-columns: 1fr;
        gap: 48px;
      }
      .footer-inner {
        grid-template-columns: repeat(3, 1fr);
      }
    }


    @media (max-width: 900px) {
      .topbar { height: 72px; }
      .topbar-inner {
        padding: 0 16px;
        gap: 16px;
      }
      .logo-wrap,
      .logo {
        width: 190px;
        height: 19px;
      }
      .nav {
        justify-content: flex-start;
        overflow-x: auto;
        scrollbar-width: none;
      }
      .nav::-webkit-scrollbar { display: none; }
      .nav a {
        font-size: 15px;
        line-height: 24px;
      }
      .nav a.active::after { bottom: -25px; }
    }


    @media (max-width: 768px) {
      :root {
        --about-copy: calc(100vw - 40px);
        --about-culture: calc(100vw - 40px);
        --about-contact: calc(100vw - 40px);
      }
      .hero {
        height: 480px;
      }
      .hero::before {
        top: 72px;
        height: 408px;
      }
      .hero-content {
        width: calc(100% - 40px);
        margin-left: 20px;
        padding-top: 160px;
      }
      .hero h1 {
        font-size: 36px;
        line-height: 52px;
      }
      .hero p {
        width: 100%;
        font-size: 18px;
        line-height: 32px;
      }
      .section-heading h2 {
        font-size: 32px;
        line-height: 48px;
      }
      .section-heading img {
        width: 28px;
      }
      .company-copy p {
        font-size: 18px;
        line-height: 34px;
      }
      .culture-grid {
        grid-template-columns: 1fr;
      }
      .culture-card p {
        font-size: 18px;
        line-height: 32px;
      }
      .contact-panel-title {
        font-size: 28px;
        line-height: 44px;
      }
      .message-form input,
      .message-form textarea,
      .consultation-select-trigger {
        font-size: 16px;
      }
      .message-row {
        grid-template-columns: 1fr;
      }
      .footer-inner {
        grid-template-columns: 1fr;
        gap: 24px;
      }
      .copyright {
        width: calc(100% - 40px);
        margin: 32px auto 0;
      }
    }