/*
  Matthew Schonewille Website
  Main stylesheet extracted from the original all-in-one index.php.
*/

    :root {
      --white: #ffffff;
      --cream: #f7efe2;
      --sand: #f2b75e;
      --green: #436a58;
      --vermilion: #d74944;
      --black: #1d2626;
      --muted: #66706d;
      --line: rgba(29, 38, 38, 0.14);
      --shadow: 0 24px 60px rgba(29, 38, 38, 0.12);
      --radius-lg: 32px;
      --radius-md: 20px;
      --max-width: 1180px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      background: var(--cream);
      color: var(--black);
      line-height: 1.6;
    }

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

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

    .page {
      overflow: hidden;
    }

    .container {
      width: min(100% - 40px, var(--max-width));
      margin: 0 auto;
    }

    .eyebrow {
      font-size: 0.82rem;
      font-weight: 900;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--vermilion);
      margin-bottom: 14px;
    }

    .section-title {
      font-family: Georgia, "Times New Roman", serif;
      font-size: clamp(2.2rem, 5vw, 4.8rem);
      line-height: 0.95;
      letter-spacing: -0.05em;
      margin-bottom: 22px;
    }

    .section-copy {
      max-width: 760px;
      color: var(--muted);
      font-size: 1.05rem;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      border: 2px solid var(--black);
      padding: 14px 22px;
      border-radius: 999px;
      font-weight: 900;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
      cursor: pointer;
    }

    .btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(29, 38, 38, 0.14);
    }

    .btn-primary {
      background: var(--sand);
      color: var(--black);
    }

    .btn-dark {
      background: var(--black);
      color: var(--white);
    }

    .btn-light {
      background: var(--white);
      color: var(--black);
    }

    .pill {
      display: inline-flex;
      align-items: center;
      border: 1px solid var(--line);
      border-radius: 999px;
      padding: 8px 12px;
      background: rgba(255, 255, 255, 0.76);
      font-weight: 800;
      font-size: 0.85rem;
      color: var(--muted);
    }

    /* Header */

    .site-header {
      position: fixed;
      z-index: 50;
      top: 18px;
      left: 0;
      right: 0;
      pointer-events: none;
    }

    .nav {
      width: min(100% - 40px, var(--max-width));
      margin: 0 auto;
      background: rgba(255, 255, 255, 0.88);
      border: 1px solid var(--line);
      border-radius: 999px;
      box-shadow: 0 12px 40px rgba(29, 38, 38, 0.08);
      backdrop-filter: blur(14px);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 10px 12px 10px 22px;
      pointer-events: auto;
    }

    .logo {
      font-weight: 950;
      letter-spacing: -0.04em;
      font-size: 1.05rem;
    }

    .logo span {
      color: var(--vermilion);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 6px;
      list-style: none;
    }

    .nav-links a {
      padding: 10px 13px;
      border-radius: 999px;
      font-size: 0.92rem;
      font-weight: 800;
      color: var(--muted);
      transition: background 0.2s ease, color 0.2s ease;
    }

    .nav-links a:hover,
    .nav-links a.active {
      background: var(--cream);
      color: var(--black);
    }

    .menu-toggle {
      display: none;
      border: 0;
      background: var(--black);
      color: var(--white);
      border-radius: 999px;
      padding: 10px 14px;
      font-weight: 900;
      cursor: pointer;
    }

    /* Hero */

    .hero {
      min-height: 100vh;
      padding: 150px 0 90px;
      position: relative;
      background:
        radial-gradient(circle at top left, rgba(242, 183, 94, 0.48), transparent 34%),
        radial-gradient(circle at bottom right, rgba(67, 106, 88, 0.23), transparent 38%),
        var(--cream);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.06fr 0.94fr;
      gap: 54px;
      align-items: center;
    }

    .hero h1 {
      font-family: Georgia, "Times New Roman", serif;
      font-size: clamp(4rem, 10vw, 8.6rem);
      line-height: 0.84;
      letter-spacing: -0.08em;
      margin-bottom: 28px;
    }

    .hero h1 .highlight {
      position: relative;
      display: inline-block;
    }

    .hero h1 .highlight::after {
      content: "";
      position: absolute;
      left: 0.05em;
      right: -0.05em;
      bottom: 0.07em;
      height: 0.18em;
      background: var(--sand);
      z-index: -1;
      transform: rotate(-2deg);
      border-radius: 20px;
    }

    .hero-copy {
      max-width: 680px;
      font-size: 1.18rem;
      color: var(--muted);
      margin-bottom: 32px;
    }

    .hero-actions {
      display: flex;
      gap: 14px;
      flex-wrap: wrap;
      margin-bottom: 38px;
    }

    .hero-meta {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 14px;
      max-width: 760px;
    }

    .meta-card {
      background: rgba(255, 255, 255, 0.72);
      border: 1px solid var(--line);
      border-radius: var(--radius-md);
      padding: 18px;
    }

    .meta-card strong {
      display: block;
      font-size: 1.45rem;
      font-family: Georgia, "Times New Roman", serif;
      margin-bottom: 4px;
    }

    .meta-card span {
      font-size: 0.88rem;
      color: var(--muted);
      font-weight: 800;
    }

    .portrait-card {
      position: relative;
      padding: 0;
      background: transparent;
      border: 0;
      box-shadow: none;
      transform: none;
    }

    .portrait-photo {
      display: block;
      width: 100%;
      max-width: 560px;
      margin-left: auto;
      border-radius: 28px;
      box-shadow: var(--shadow);
    }

    /* Shared sections */

    section {
      padding: 100px 0;
    }

    .about {
      background: var(--white);
    }

    .about-grid {
      display: grid;
      grid-template-columns: 0.9fr 1.1fr;
      gap: 60px;
      align-items: start;
    }

    .about-card {
      background: var(--green);
      color: var(--white);
      border-radius: var(--radius-lg);
      padding: 36px;
      position: sticky;
      top: 120px;
    }

    .about-card h3 {
      font-family: Georgia, "Times New Roman", serif;
      font-size: 2.4rem;
      line-height: 1;
      margin-bottom: 18px;
    }

    .about-card p {
      color: rgba(255, 255, 255, 0.78);
      margin-bottom: 24px;
    }

    .credential-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 24px;
    }

    .credential-list .pill {
      background: rgba(255,255,255,0.12);
      color: rgba(255,255,255,0.86);
      border-color: rgba(255,255,255,0.18);
    }

    .about-list {
      display: grid;
      gap: 18px;
    }

    .about-item {
      border-bottom: 1px solid var(--line);
      padding-bottom: 18px;
    }

    .about-item h4 {
      font-size: 1.1rem;
      margin-bottom: 6px;
    }

    .about-item p,
    .about-item li {
      color: var(--muted);
    }

    .about-item ul {
      padding-left: 19px;
      margin-top: 8px;
    }

    .focus {
      background: var(--cream);
    }

    .focus-header {
      display: flex;
      justify-content: space-between;
      gap: 30px;
      align-items: end;
      margin-bottom: 38px;
    }

    .focus-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
    }

    .focus-card {
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: var(--radius-lg);
      padding: 28px;
      min-height: 320px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .focus-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow);
    }

    .focus-card:nth-child(2) {
      background: var(--sand);
      border-color: var(--black);
    }

    .focus-card:nth-child(3) {
      background: var(--green);
      color: var(--white);
    }

    .focus-card:nth-child(3) p {
      color: rgba(255, 255, 255, 0.76);
    }

    .focus-card .number {
      font-weight: 950;
      color: var(--vermilion);
    }

    .focus-card h3 {
      font-family: Georgia, "Times New Roman", serif;
      font-size: 2rem;
      line-height: 1;
      margin: 24px 0 14px;
    }

    .focus-card p {
      color: var(--muted);
      font-size: 0.98rem;
    }

    .dark-section {
      background: var(--black);
      color: var(--white);
    }

    .dark-section .section-copy {
      color: rgba(255, 255, 255, 0.68);
    }

    .project-grid {
      margin-top: 42px;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .project-card {
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.14);
      border-radius: var(--radius-lg);
      padding: 30px;
    }

    .project-card .tag {
      display: inline-block;
      background: var(--sand);
      color: var(--black);
      font-size: 0.78rem;
      font-weight: 950;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      padding: 8px 12px;
      border-radius: 999px;
      margin-bottom: 22px;
    }

    .project-card h3 {
      font-family: Georgia, "Times New Roman", serif;
      font-size: 2rem;
      line-height: 1;
      margin-bottom: 16px;
    }

    .project-card p {
      color: rgba(255, 255, 255, 0.68);
    }

    .publications {
      background: var(--white);
    }

    .pub-list {
      margin-top: 38px;
      display: grid;
      gap: 14px;
    }

    .pub-subheading {
      margin-top: 44px;
      margin-bottom: -16px;
      display: flex;
      align-items: center;
      gap: 14px;
      color: var(--black);
      font-size: 0.86rem;
      font-weight: 950;
      letter-spacing: 0.1em;
      text-transform: uppercase;
    }

    .pub-subheading::after {
      content: "";
      height: 1px;
      flex: 1;
      background: var(--line);
    }

    .pub-item.working-paper {
      background: rgba(247, 239, 226, 0.52);
      border-style: dashed;
    }

    .pub-status {
      display: inline-flex;
      align-items: center;
      width: fit-content;
      margin-top: 8px;
      border-radius: 999px;
      background: rgba(67, 106, 88, 0.1);
      color: var(--green);
      padding: 5px 9px;
      font-size: 0.76rem;
      font-weight: 900;
      letter-spacing: 0.04em;
      text-transform: uppercase;
    }

    .pub-item {
      display: grid;
      grid-template-columns: 108px 1fr auto;
      gap: 24px;
      align-items: center;
      border: 1px solid var(--line);
      border-radius: 24px;
      padding: 20px;
      transition: background 0.2s ease, transform 0.2s ease;
    }

    .pub-item:hover {
      background: var(--cream);
      transform: translateX(4px);
    }

    .pub-item.pub-link {
      cursor: pointer;
    }

    .pub-item.pub-link:focus-visible {
      outline: 3px solid var(--sand);
      outline-offset: 4px;
    }

    .pub-item .pub-arrow.inactive {
      background: rgba(29, 38, 38, 0.08);
      color: rgba(29, 38, 38, 0.32);
    }

    .pub-year {
      font-family: Georgia, "Times New Roman", serif;
      font-size: 1.8rem;
      font-weight: 900;
      color: var(--green);
    }

    .pub-item h3 {
      font-size: 1.08rem;
      margin-bottom: 4px;
    }

    .pub-item p {
      color: var(--muted);
      font-size: 0.94rem;
    }

    .pub-arrow {
      width: 42px;
      height: 42px;
      border-radius: 999px;
      background: var(--sand);
      display: grid;
      place-items: center;
      font-weight: 950;
    }

    .two-column {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 42px;
    }

    .info-panel {
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: var(--radius-lg);
      padding: 30px;
    }

    .info-panel h3 {
      font-family: Georgia, "Times New Roman", serif;
      font-size: 2rem;
      line-height: 1;
      margin-bottom: 16px;
    }

    .info-panel ul {
      padding-left: 20px;
      color: var(--muted);
    }

    .info-panel li + li {
      margin-top: 8px;
    }

    .speaking {
      background: var(--cream);
    }


    .presentation-groups {
      margin-top: 44px;
      display: grid;
      gap: 24px;
    }

    .presentation-group {
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: var(--radius-lg);
      padding: 30px;
    }

    .presentation-group h3 {
      font-family: Georgia, "Times New Roman", serif;
      font-size: 2.2rem;
      line-height: 1;
      margin-bottom: 18px;
    }

    .presentation-list {
      display: grid;
      gap: 14px;
    }

    .presentation-item {
      border-top: 1px solid var(--line);
      padding-top: 14px;
    }

    .presentation-item:first-child {
      border-top: 0;
      padding-top: 0;
    }

    .presentation-item strong {
      display: block;
      font-size: 1.04rem;
      line-height: 1.35;
      margin-bottom: 4px;
    }

    .presentation-item span {
      display: block;
      color: var(--muted);
      font-size: 0.94rem;
    }


    .timeline {
      margin-top: 44px;
      display: grid;
      gap: 18px;
    }

    .talk {
      display: grid;
      grid-template-columns: 250px 1fr;
      gap: 28px;
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: var(--radius-lg);
      padding: 26px;
    }

    .talk-meta {
      color: var(--vermilion);
      font-weight: 950;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      font-size: 0.82rem;
    }

    .talk h3 {
      font-family: Georgia, "Times New Roman", serif;
      font-size: 2rem;
      line-height: 1;
      margin-bottom: 10px;
    }

    .talk p {
      color: var(--muted);
    }

    .contact {
      background: var(--cream);
      color: var(--black);
      text-align: left;
    }

    .contact-layout {
      display: grid;
      grid-template-columns: 0.92fr 1.08fr;
      gap: 34px;
      align-items: start;
    }

    .contact-copy .section-copy {
      margin-bottom: 26px;
    }

    .contact-detail-list {
      display: grid;
      gap: 20px;
      margin-top: 30px;
    }

    .contact-detail {
      display: grid;
      grid-template-columns: 170px 1fr;
      gap: 18px;
      align-items: start;
      padding-bottom: 18px;
      border-bottom: 1px solid var(--line);
    }

    .contact-detail:last-child {
      border-bottom: 0;
      padding-bottom: 0;
    }

    .contact-detail h3 {
      font-family: Georgia, "Times New Roman", serif;
      font-size: 1.55rem;
      line-height: 1;
    }

    .contact-detail p,
    .contact-detail a {
      color: var(--muted);
      font-size: 1rem;
    }

    .contact-card {
      background: rgba(255, 255, 255, 0.84);
      border: 1px solid var(--line);
      border-radius: 34px;
      padding: 38px;
      box-shadow: var(--shadow);
    }

    .form-grid {
      display: grid;
      gap: 18px;
    }

    .field {
      display: block;
    }

    .field span {
      display: block;
      font-size: 0.84rem;
      font-weight: 900;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--muted);
      margin-bottom: 10px;
    }

    .field input,
    .field textarea {
      width: 100%;
      border: 0;
      border-radius: 8px;
      background: #f1ebdf;
      color: var(--black);
      padding: 18px 18px;
      font: inherit;
      outline: none;
    }

    .field textarea {
      min-height: 170px;
      resize: vertical;
    }

    .contact-submit {
      width: 100%;
      margin-top: 22px;
      border-radius: 10px;
      padding: 17px 22px;
      background: var(--green);
      color: var(--white);
      border-color: var(--green);
    }

    .form-note {
      margin-top: 14px;
      color: var(--muted);
      font-size: 0.92rem;
    }


    .form-alert {
      margin-bottom: 20px;
      border-radius: 12px;
      padding: 14px 16px;
      font-weight: 800;
      line-height: 1.45;
    }

    .form-alert.success {
      background: rgba(67, 106, 88, 0.12);
      border: 1px solid rgba(67, 106, 88, 0.34);
      color: var(--green);
    }

    .form-alert.error {
      background: rgba(215, 73, 68, 0.10);
      border: 1px solid rgba(215, 73, 68, 0.32);
      color: var(--vermilion);
    }

    footer {
      background: var(--black);
      color: rgba(255, 255, 255, 0.72);
      padding: 24px 0;
      font-size: 0.92rem;
    }

    .footer-inner {
      display: flex;
      justify-content: space-between;
      gap: 20px;
      flex-wrap: wrap;
    }

    /* Reveal animation */

    .reveal {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.7s ease, transform 0.7s ease;
    }

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

    /* Responsive */

    @media (max-width: 1040px) {
      .hero-grid,
      .about-grid,
      .project-grid,
      .focus-grid,
      .two-column,
      .contact-layout {
        grid-template-columns: 1fr;
      }

      .focus-header {
        display: block;
      }

      .portrait-photo {
        margin: 0 auto;
        max-width: 520px;
      }

      .about-card {
        position: static;
      }

      .talk {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 760px) {
      .nav {
        border-radius: 24px;
        align-items: flex-start;
      }

      .menu-toggle {
        display: inline-flex;
      }

      .nav-links {
        position: absolute;
        top: calc(100% + 10px);
        left: 20px;
        right: 20px;
        background: var(--white);
        border: 1px solid var(--line);
        border-radius: 24px;
        box-shadow: var(--shadow);
        padding: 12px;
        display: none;
        flex-direction: column;
        align-items: stretch;
      }

      .nav-links.open {
        display: flex;
      }

      .nav-links a {
        display: block;
      }

      .hero {
        padding-top: 130px;
      }

      .hero-meta {
        grid-template-columns: 1fr;
      }

      section {
        padding: 74px 0;
      }

      .pub-item {
        grid-template-columns: 1fr;
      }

      .contact-detail {
        grid-template-columns: 1fr;
        gap: 10px;
      }

      .contact-card {
        padding: 26px;
      }

      .pub-arrow {
        display: none;
      }
    }
  

/* Archive and concept pages */
.subpage-hero {
  padding: 150px 0 80px;
  background:
    radial-gradient(circle at top left, rgba(242, 183, 94, 0.42), transparent 34%),
    radial-gradient(circle at bottom right, rgba(67, 106, 88, 0.18), transparent 38%),
    var(--cream);
}

.subpage-hero .section-copy {
  font-size: 1.12rem;
}

.archive-section {
  background: var(--white);
}

.archive-grid {
  margin-top: 42px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.archive-card {
  display: flex;
  min-height: 310px;
  flex-direction: column;
  justify-content: space-between;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.archive-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  background: var(--cream);
}

.archive-card .archive-meta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.archive-card h3 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2rem;
  line-height: 1;
  margin-bottom: 14px;
}

.archive-card p {
  color: var(--muted);
}

.archive-card .read-more {
  margin-top: 24px;
  font-weight: 950;
  color: var(--vermilion);
}

.concept-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 310px;
  gap: 42px;
  align-items: start;
}

.concept-article {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 42px;
}

.concept-article h2 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.9rem, 4vw, 3.2rem);
  line-height: 1;
  letter-spacing: -0.04em;
  margin: 36px 0 16px;
}

.concept-article h2:first-child {
  margin-top: 0;
}

.concept-article p,
.concept-article li {
  color: var(--muted);
  font-size: 1.04rem;
}

.concept-article ul,
.concept-article ol {
  padding-left: 22px;
  margin: 14px 0 24px;
}

.concept-sidebar {
  position: sticky;
  top: 120px;
  display: grid;
  gap: 18px;
}

.sidebar-card {
  background: var(--green);
  color: var(--white);
  border-radius: var(--radius-lg);
  padding: 26px;
}

.sidebar-card.light {
  background: var(--white);
  color: var(--black);
  border: 1px solid var(--line);
}

.sidebar-card h3 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.8rem;
  line-height: 1;
  margin-bottom: 12px;
}

.sidebar-card p,
.sidebar-card li {
  color: rgba(255, 255, 255, 0.74);
}

.sidebar-card.light p,
.sidebar-card.light li {
  color: var(--muted);
}

.sidebar-card ul {
  padding-left: 19px;
}

@media (max-width: 1040px) {
  .archive-grid,
  .concept-layout {
    grid-template-columns: 1fr;
  }

  .concept-sidebar {
    position: static;
  }
}

/* =========================================================
   Concept / Framework Page Templates
   ========================================================= */

.concept-page main {
  background: var(--cream);
}

.concept-hero {
  min-height: auto;
  padding: 150px 0 90px;
  background:
    radial-gradient(circle at top left, rgba(242, 183, 94, 0.34), transparent 34%),
    radial-gradient(circle at bottom right, rgba(67, 106, 88, 0.18), transparent 38%),
    var(--cream);
}

.concept-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.65fr);
  gap: 46px;
  align-items: start;
}

.concept-hero-content {
  max-width: 850px;
}

.concept-hero .section-title {
  max-width: 900px;
  margin-bottom: 24px;
}

.concept-lede {
  max-width: 920px;
  color: var(--black);
  font-size: clamp(1.12rem, 2vw, 1.38rem);
  line-height: 1.58;
  margin-bottom: 28px;
}

.concept-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.concept-side-card {
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow);
  position: sticky;
  top: 120px;
}

.concept-side-card h2 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2.15rem;
  line-height: 1;
  margin: 16px 0 14px;
  letter-spacing: -0.04em;
}

.concept-side-card p {
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.65;
}

.concept-meta {
  display: grid;
  gap: 16px;
  margin-top: 24px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.concept-meta div {
  display: grid;
  gap: 4px;
}

.concept-meta dt {
  font-size: 0.78rem;
  font-weight: 950;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--vermilion);
}

.concept-meta dd {
  color: var(--black);
  font-weight: 750;
}

.concept-section {
  padding: 100px 0;
  background: var(--white);
}

.concept-section-alt {
  background: var(--cream);
}

.concept-content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 46px;
  align-items: start;
}

.concept-main {
  max-width: 860px;
}

.concept-main h2 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1;
  letter-spacing: -0.045em;
  margin-bottom: 22px;
}

.concept-main p {
  color: var(--muted);
  font-size: 1.06rem;
  line-height: 1.78;
  margin-bottom: 18px;
}

.concept-main em {
  color: var(--black);
}

.concept-sidebar {
  background: var(--green);
  color: var(--white);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: sticky;
  top: 120px;
}

.concept-sidebar h3 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2rem;
  line-height: 1;
  margin-bottom: 14px;
}

.concept-sidebar p,
.concept-sidebar li {
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.98rem;
  line-height: 1.65;
}

.concept-list {
  padding-left: 20px;
  display: grid;
  gap: 8px;
}

.concept-section-header {
  max-width: 860px;
  margin-bottom: 42px;
}

.concept-card-grid {
  display: grid;
  gap: 20px;
}

.concept-card-grid.two-column {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.concept-card-grid.three-column {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.concept-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: 0 12px 36px rgba(29, 38, 38, 0.06);
}

.concept-section-alt .concept-card {
  background: rgba(255, 255, 255, 0.78);
}

.concept-card h3 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2rem;
  line-height: 1;
  letter-spacing: -0.04em;
  margin-bottom: 14px;
}

.concept-card p {
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.68;
}

.concept-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  margin-bottom: 22px;
  border-radius: 999px;
  background: var(--sand);
  color: var(--black);
  font-weight: 950;
}

.principle-list {
  display: grid;
  gap: 16px;
}

.principle-item {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 26px;
}

.principle-item span {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border-radius: 999px;
  background: var(--sand);
  color: var(--black);
  font-weight: 950;
}

.principle-item h3 {
  font-size: 1.22rem;
  line-height: 1.25;
  margin-bottom: 8px;
}

.principle-item p {
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.65;
}

.concept-cta {
  padding: 110px 0;
  background: var(--black);
  color: var(--white);
}

.concept-cta .section-copy {
  color: rgba(255, 255, 255, 0.68);
}

.concept-cta .btn-light {
  background: transparent;
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.64);
}

@media (max-width: 1040px) {
  .concept-hero-grid,
  .concept-content-grid,
  .concept-card-grid.two-column,
  .concept-card-grid.three-column {
    grid-template-columns: 1fr;
  }

  .concept-side-card,
  .concept-sidebar {
    position: static;
  }
}

@media (max-width: 760px) {
  .concept-hero {
    padding: 130px 0 74px;
  }

  .concept-section,
  .concept-cta {
    padding: 74px 0;
  }

  .concept-side-card,
  .concept-sidebar,
  .concept-card,
  .principle-item {
    padding: 24px;
  }

  .principle-item {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .principle-item span {
    width: 46px;
    height: 46px;
  }
}