/* Homepage composition: Sổ tay kiểm chứng SEO. */
.home .b-hero{border-bottom:1px solid var(--st-border)}
.home .elementor-element-0b1e813{display:none}
.home .b-hero-grid{min-height:610px}
.home .b-hero-copy{max-width:650px}
.home .b-hero h1{max-width:780px}
.home .b-intent-paths{padding:76px 0;background:#fff;border-bottom:1px solid var(--st-border)}
.home .b-intent-paths h2{max-width:820px;margin-bottom:34px}
.home .b-intent-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid var(--st-border);border-left:1px solid var(--st-border)}
.home .b-intent-grid a{display:flex;min-height:230px;flex-direction:column;padding:28px;border-right:1px solid var(--st-border);border-bottom:1px solid var(--st-border);background:#fff}
.home .b-intent-grid a:hover{background:var(--st-blue-soft)}
.home .b-intent-grid span{font:700 11px/1.5 monospace;letter-spacing:.08em;color:var(--st-orange);margin-bottom:32px}
.home .b-intent-grid strong{font-size:22px;line-height:1.3;color:var(--st-dark);margin-bottom:13px}
.home .b-intent-grid small{font-size:15px;line-height:1.65;color:var(--st-muted)}
.home .b-process{background:var(--st-blue-soft)}
.home .b-process li>span{color:var(--st-orange)}
.home .b-process-links{display:flex;flex-wrap:wrap;gap:12px 24px;margin-top:26px}.home .b-process-links a{color:var(--st-blue);font-weight:700;text-decoration:underline;text-underline-offset:4px}
.home #hoc-va-dich-vu{scroll-margin-top:110px}
@media(max-width:899px){.home .b-hero-grid{min-height:0}.home .b-intent-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.home .b-intent-grid a:last-child{grid-column:1/-1;min-height:190px}}
@media(max-width:640px){.home .b-intent-paths{padding:52px 0}.home .b-intent-grid{grid-template-columns:1fr}.home .b-intent-grid a,.home .b-intent-grid a:last-child{grid-column:auto;min-height:0}.home .b-intent-grid span{margin-bottom:22px}}
    :root {
      --st-bg: #f8fafc;
      --st-surface: #ffffff;
      --st-surface-soft: #f1f5f9;

      --st-dark: #0f172a;
      --st-text: #334155;
      --st-muted: #64748b;

      --st-blue: #1d4ed8;
      --st-blue-dark: #1e40af;
      --st-blue-soft: #eff6ff;

      --st-orange: #e87924;
      --st-orange-dark: #c9671e;
      --st-orange-soft: #fff7ed;

      --st-border: #e2e8f0;

      --st-radius-sm: 8px;
      --st-radius-md: 12px;
      --st-radius-lg: 20px;

      --st-shadow:
        0 1px 2px rgba(15, 23, 42, 0.03),
        0 6px 24px rgba(15, 23, 42, 0.05);

      --st-max: 1160px;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      background: var(--st-bg);
      color: var(--st-text);
      font-family:
        Inter,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Roboto,
        Helvetica,
        Arial,
        sans-serif;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
    }

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

    button,
    input,
    select,
    textarea {
      font: inherit;
    }

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

    .st-section {
      padding: 88px 0;
    }

    .st-section-white {
      background: var(--st-surface);
      border-top: 1px solid var(--st-border);
      border-bottom: 1px solid var(--st-border);
    }

    .st-eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 18px;
      padding: 7px 13px;
      border: 1px solid #bfdbfe;
      border-radius: 999px;
      background: var(--st-blue-soft);
      color: var(--st-blue-dark);
      font-size: 12px;
      font-weight: 800;
      letter-spacing: .06em;
      text-transform: uppercase;
    }

    .st-section-heading {
      max-width: 760px;
      margin: 0 auto 48px;
      text-align: center;
    }

    .st-section-heading h2 {
      margin: 0 0 12px;
      color: var(--st-dark);
      font-size: clamp(27px, 4vw, 40px);
      line-height: 1.25;
      letter-spacing: -.02em;
    }

    .st-section-heading p {
      margin: 0;
      color: var(--st-muted);
      font-size: 16px;
    }

    .st-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      min-height: 48px;
      padding: 12px 22px;
      border: 1px solid transparent;
      border-radius: var(--st-radius-sm);
      text-decoration: none;
      font-size: 14px;
      font-weight: 750;
      transition:
        background .2s ease,
        border-color .2s ease,
        transform .2s ease;
    }

    .st-btn:hover {
      transform: translateY(-2px);
    }

    .st-btn-primary {
      background: var(--st-blue);
      color: #fff;
    }

    .st-btn-primary:hover {
      background: var(--st-blue-dark);
    }

    .st-btn-secondary {
      background: #fff;
      color: var(--st-dark);
      border-color: var(--st-border);
    }

    .st-btn-secondary:hover {
      border-color: #94a3b8;
    }

    .st-btn-orange {
      background: var(--st-orange);
      color: #fff;
    }

    .st-btn-orange:hover {
      background: var(--st-orange-dark);
    }

    /* HEADER */

    .st-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--st-border);
    }

    .st-nav {
      min-height: 68px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 30px;
    }

    .st-brand {
      text-decoration: none;
      color: var(--st-dark);
      line-height: 1;
    }

    .st-brand-main {
      display: block;
      font-size: 19px;
      font-weight: 900;
      letter-spacing: -.03em;
    }

    .st-brand-sub {
      display: block;
      margin-top: 5px;
      color: var(--st-muted);
      font-size: 10px;
      font-weight: 700;
      letter-spacing: .08em;
      text-transform: uppercase;
    }

    .st-menu {
      display: flex;
      align-items: center;
      gap: 26px;
    }

    .st-menu a {
      color: var(--st-text);
      text-decoration: none;
      font-size: 14px;
      font-weight: 650;
    }

    .st-menu a:hover {
      color: var(--st-blue);
    }

    /* HERO */

    .st-hero {
      overflow: hidden;
      padding: 108px 0 88px;
      background:
        radial-gradient(
          circle at 80% 15%,
          rgba(29,78,216,.08),
          transparent 28%
        ),
        radial-gradient(
          circle at 8% 80%,
          rgba(232,121,36,.06),
          transparent 25%
        ),
        #fff;
      border-bottom: 1px solid var(--st-border);
    }

    .st-hero-inner {
      max-width: 920px;
      margin: auto;
      text-align: center;
    }

    .st-hero h1 {
      margin: 0 auto 24px;
      max-width: 900px;
      color: var(--st-dark);
      font-size: clamp(40px, 7vw, 68px);
      line-height: 1.1;
      letter-spacing: -.045em;
    }

    .st-hero h1 span {
      color: var(--st-blue);
    }

    .st-hero-lead {
      max-width: 770px;
      margin: 0 auto;
      color: var(--st-muted);
      font-size: clamp(17px, 2vw, 20px);
      line-height: 1.75;
    }

    .st-hero-actions {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 34px;
    }

    .st-hero-note {
      max-width: 670px;
      margin: 34px auto 0;
      padding-top: 24px;
      border-top: 1px solid var(--st-border);
      color: var(--st-muted);
      font-size: 13px;
    }

    /* INTRO */

    .st-intro-grid {
      display: grid;
      grid-template-columns: .85fr 1.15fr;
      gap: 70px;
      align-items: start;
    }

    .st-intro-title {
      position: sticky;
      top: 110px;
    }

    .st-intro-title h2 {
      margin: 0;
      color: var(--st-dark);
      font-size: clamp(29px, 4vw, 42px);
      line-height: 1.25;
    }

    .st-long-copy p {
      margin: 0 0 22px;
      font-size: 17px;
    }

    .st-long-copy strong {
      color: var(--st-dark);
    }

    .st-quote {
      margin: 32px 0 0;
      padding: 22px 26px;
      border-left: 4px solid var(--st-orange);
      border-radius: 0 var(--st-radius-md) var(--st-radius-md) 0;
      background: var(--st-orange-soft);
      color: var(--st-dark);
      font-size: 18px;
      font-weight: 650;
    }

    /* TOPICS */

    .st-topic-grid {
      display: grid;
      grid-template-columns: repeat(12, 1fr);
      gap: 18px;
    }

    .st-topic {
      grid-column: span 4;
      padding: 28px;
      background: #fff;
      border: 1px solid var(--st-border);
      border-radius: var(--st-radius-lg);
      box-shadow: var(--st-shadow);
    }

    .st-topic:nth-child(4),
    .st-topic:nth-child(5) {
      grid-column: span 6;
    }

    .st-topic-number {
      margin-bottom: 18px;
      color: var(--st-blue);
      font-size: 12px;
      font-weight: 850;
      letter-spacing: .08em;
    }

    .st-topic h3 {
      margin: 0 0 10px;
      color: var(--st-dark);
      font-size: 20px;
    }

    .st-topic p {
      margin: 0;
      color: var(--st-muted);
      font-size: 14.5px;
    }

    .st-topic-link {
      display: inline-block;
      margin-top: 18px;
      color: var(--st-blue);
      font-size: 13px;
      font-weight: 750;
      text-decoration: none;
    }

    /* JOURNAL */

    .st-journal-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .st-journal-card {
      display: flex;
      flex-direction: column;
      min-height: 290px;
      padding: 26px;
      border: 1px solid var(--st-border);
      border-radius: var(--st-radius-lg);
      background: var(--st-surface);
      text-decoration: none;
      box-shadow: var(--st-shadow);
      transition: transform .2s ease, border-color .2s ease;
    }

    .st-journal-card:hover {
      transform: translateY(-3px);
      border-color: #93c5fd;
    }

    .st-tag {
      width: fit-content;
      padding: 5px 10px;
      border-radius: 999px;
      background: var(--st-blue-soft);
      color: var(--st-blue);
      font-size: 11px;
      font-weight: 800;
      text-transform: uppercase;
    }

    .st-journal-card h3 {
      margin: 20px 0 12px;
      color: var(--st-dark);
      font-size: 20px;
      line-height: 1.4;
    }

    .st-journal-card p {
      margin: 0;
      color: var(--st-muted);
      font-size: 14px;
    }

    .st-journal-more {
      margin-top: auto;
      padding-top: 24px;
      color: var(--st-blue);
      font-size: 13px;
      font-weight: 750;
    }

    /* PRINCIPLES */

    .st-principles {
      background: var(--st-dark);
      color: #fff;
    }

    .st-principles .st-section-heading h2 {
      color: #fff;
    }

    .st-principles .st-section-heading p {
      color: #94a3b8;
    }

    .st-principle-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 1px;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,.1);
      border-radius: var(--st-radius-lg);
      background: rgba(255,255,255,.1);
    }

    .st-principle {
      padding: 34px;
      background: var(--st-dark);
    }

    .st-principle h3 {
      margin: 0 0 9px;
      font-size: 19px;
    }

    .st-principle p {
      margin: 0;
      color: #94a3b8;
      font-size: 14.5px;
    }

    /* EXPERIMENT */

    .st-experiment {
      max-width: 900px;
      margin: auto;
      overflow: hidden;
      background: #fff;
      border: 1px solid var(--st-border);
      border-radius: var(--st-radius-lg);
      box-shadow: var(--st-shadow);
    }

    .st-exp-header {
      padding: 28px 32px;
      background: var(--st-blue-soft);
      border-bottom: 1px solid #dbeafe;
    }

    .st-exp-header span {
      color: var(--st-blue);
      font-size: 11px;
      font-weight: 850;
      letter-spacing: .07em;
      text-transform: uppercase;
    }

    .st-exp-header h3 {
      margin: 8px 0 0;
      color: var(--st-dark);
      font-size: 24px;
    }

    .st-exp-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
    }

    .st-exp-item {
      padding: 26px 32px;
      border-bottom: 1px solid var(--st-border);
    }

    .st-exp-item:nth-child(odd) {
      border-right: 1px solid var(--st-border);
    }

    .st-exp-item strong {
      display: block;
      margin-bottom: 7px;
      color: var(--st-dark);
    }

    .st-exp-item p {
      margin: 0;
      color: var(--st-muted);
      font-size: 14px;
    }

    /* LEARN */

    .st-learn-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 22px;
      max-width: 980px;
      margin: auto;
    }

    .st-learn-card {
      display: flex;
      flex-direction: column;
      padding: 32px;
      background: #fff;
      border: 1px solid var(--st-border);
      border-radius: var(--st-radius-lg);
      box-shadow: var(--st-shadow);
    }

    .st-learn-card-primary {
      border-color: #fed7aa;
      background: #fffdf9;
    }

    .st-learn-card small {
      margin-bottom: 12px;
      color: var(--st-orange);
      font-weight: 850;
      text-transform: uppercase;
    }

    .st-learn-card h3 {
      margin: 0 0 12px;
      color: var(--st-dark);
      font-size: 23px;
    }

    .st-learn-card p {
      margin: 0 0 24px;
      color: var(--st-muted);
    }

    .st-learn-card .st-btn {
      margin-top: auto;
    }

    /* ABOUT */

    .st-about {
      display: grid;
      grid-template-columns: .7fr 1.3fr;
      gap: 60px;
      max-width: 1000px;
      margin: auto;
      align-items: start;
    }

    .st-about-card {
      padding: 30px;
      border-radius: var(--st-radius-lg);
      background: var(--st-blue-soft);
      border: 1px solid #dbeafe;
    }

    .st-about-logo {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 84px;
      height: 84px;
      margin-bottom: 22px;
      border-radius: 20px;
      background: var(--st-dark);
      color: #fff;
      font-weight: 900;
      font-size: 24px;
    }

    .st-about-card strong {
      display: block;
      color: var(--st-dark);
      font-size: 22px;
    }

    .st-about-card span {
      color: var(--st-muted);
      font-size: 13px;
    }

    .st-about-content h2 {
      margin: 0 0 18px;
      color: var(--st-dark);
      font-size: 34px;
    }

    .st-about-content p {
      margin: 0 0 18px;
    }

    /* FAQ */

    .st-faq-wrap {
      max-width: 860px;
      margin: auto;
    }

    .st-faq-item {
      margin-bottom: 12px;
      border: 1px solid var(--st-border);
      border-radius: var(--st-radius-md);
      overflow: hidden;
      background: #fff;
    }

    .st-faq-question {
      width: 100%;
      padding: 20px 22px;
      display: flex;
      justify-content: space-between;
      gap: 20px;
      border: 0;
      background: #fff;
      color: var(--st-dark);
      text-align: left;
      font-weight: 750;
      cursor: pointer;
    }

    .st-faq-question:hover {
      background: #f8fafc;
    }

    .st-faq-icon {
      transition: transform .2s ease;
    }

    .st-faq-answer {
      display: none;
      padding: 0 22px 22px;
      color: var(--st-muted);
      font-size: 14.5px;
    }

    .st-faq-item.active .st-faq-answer {
      display: block;
    }

    .st-faq-item.active .st-faq-icon {
      transform: rotate(45deg);
    }

    /* CONTACT */

    .st-contact-card {
      display: grid;
      grid-template-columns: 1fr 1fr;
      max-width: 980px;
      margin: auto;
      overflow: hidden;
      border-radius: var(--st-radius-lg);
      box-shadow: var(--st-shadow);
      border: 1px solid var(--st-border);
    }

    .st-contact-copy {
      padding: 40px;
      background: var(--st-dark);
      color: #fff;
    }

    .st-contact-copy h2 {
      margin: 0 0 14px;
      font-size: 32px;
    }

    .st-contact-copy p {
      color: #94a3b8;
    }

    .st-contact-list {
      margin-top: 30px;
    }

    .st-contact-list div {
      margin-bottom: 15px;
      color: #cbd5e1;
      font-size: 14px;
    }

    .st-contact-list strong {
      display: block;
      color: #fff;
    }

    .st-contact-form {
      padding: 40px;
      background: #fff;
    }

    .st-field {
      margin-bottom: 16px;
    }

    .st-field label {
      display: block;
      margin-bottom: 6px;
      color: var(--st-dark);
      font-size: 13px;
      font-weight: 700;
    }

    .st-input,
    .st-select,
    .st-textarea {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--st-border);
      border-radius: var(--st-radius-sm);
      outline: none;
      background: #fff;
    }

    .st-input:focus,
    .st-select:focus,
    .st-textarea:focus {
      border-color: #60a5fa;
      box-shadow: 0 0 0 3px rgba(59,130,246,.1);
    }

    /* FOOTER */

    .st-footer {
      padding: 46px 0;
      background: #020617;
      color: #94a3b8;
    }

    .st-footer-grid {
      display: grid;
      grid-template-columns: 1.2fr .8fr;
      gap: 40px;
    }

    .st-footer-brand {
      color: #fff;
      font-size: 20px;
      font-weight: 900;
    }

    .st-footer p {
      max-width: 560px;
      margin: 12px 0 0;
      font-size: 13px;
    }

    .st-footer-links {
      display: flex;
      justify-content: flex-end;
      flex-wrap: wrap;
      gap: 18px;
    }

    .st-footer-links a {
      color: #cbd5e1;
      font-size: 13px;
      text-decoration: none;
    }

    .st-copyright {
      margin-top: 34px;
      padding-top: 22px;
      border-top: 1px solid rgba(255,255,255,.08);
      font-size: 12px;
    }

    /* RESPONSIVE */

    @media (max-width: 900px) {
      .st-menu {
        display: none;
      }

      .st-hero {
        padding: 80px 0 70px;
      }

      .st-intro-grid,
      .st-about,
      .st-contact-card {
        grid-template-columns: 1fr;
        gap: 34px;
      }

      .st-intro-title {
        position: static;
      }

      .st-topic {
        grid-column: span 6;
      }

      .st-topic:nth-child(4),
      .st-topic:nth-child(5) {
        grid-column: span 6;
      }

      .st-journal-grid {
        grid-template-columns: 1fr 1fr;
      }

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

      .st-footer-links {
        justify-content: flex-start;
      }
    }

    @media (max-width: 640px) {
      .st-container {
        width: min(calc(100% - 30px), var(--st-max));
      }

      .st-section {
        padding: 64px 0;
      }

      .st-hero h1 {
        font-size: 40px;
      }

      .st-topic,
      .st-topic:nth-child(4),
      .st-topic:nth-child(5) {
        grid-column: span 12;
      }

      .st-journal-grid,
      .st-learn-grid,
      .st-principle-grid,
      .st-exp-grid {
        grid-template-columns: 1fr;
      }

      .st-exp-item:nth-child(odd) {
        border-right: 0;
      }

      .st-contact-copy,
      .st-contact-form {
        padding: 28px;
      }
    }