:root {
        /* Colors */
        --bg-main: #ffffff;
        --bg-soft: #f5f8ff;
        --surface-card: rgba(255, 255, 255, 0.94);
        --surface-tint: #f8fbff;
        --brand-primary: #163e73;
        --brand-primary-strong: #0d2c57;
        --brand-secondary: #e8f1ff;
        --text-main: #111827;
        --text-sub: #475467;
        --text-soft: #6b7280;
        --line-soft: rgba(22, 35, 63, 0.08);
        --line-strong: rgba(22, 62, 115, 0.12);

        /* Layout */
        --shell-max: 1200px;
        --section-gap: 96px;
        --card-padding: 32px;
        --radius-lg: 30px;
        --radius-md: 22px;
        --radius-sm: 16px;
        --radius-pill: 999px;

        /* Motion */
        --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);

        /* Effects */
        --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.04);
        --shadow-hover: 0 18px 40px rgba(22, 62, 115, 0.1);

        /* Legacy aliases */
        --surface: var(--surface-card);
        --surface-strong: var(--surface-tint);
        --text: var(--text-main);
        --muted: var(--text-sub);
        --line: var(--line-soft);
        --accent: var(--brand-primary);
        --accent-strong: var(--brand-primary-strong);
        --accent-soft: rgba(22, 62, 115, 0.08);
        --shadow: var(--shadow-soft);
        --max-width: var(--shell-max);
      }

      * {
        box-sizing: border-box;
      }

      html {
        scroll-behavior: smooth;
      }

      body {
        margin: 0;
        font-family: "Pretendard", "Noto Sans KR", sans-serif;
        color: var(--text);
        background:
          radial-gradient(circle at top left, rgba(22, 62, 115, 0.08), transparent 22%),
          linear-gradient(180deg, var(--bg-main) 0%, var(--bg-soft) 100%);
        line-height: 1.7;
        -webkit-font-smoothing: antialiased;
      }

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

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

      .shell {
        width: min(calc(100% - 32px), var(--max-width));
        margin: 0 auto;
      }

      .topbar {
        position: sticky;
        top: 0;
        z-index: 10;
        backdrop-filter: blur(20px);
        background: rgba(255, 255, 255, 0.88);
        border-bottom: 1px solid var(--line-soft);
        box-shadow: 0 6px 20px rgba(17, 24, 39, 0.03);
      }

      .topbar-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 16px;
        padding: 16px 0;
      }

      .brand {
        display: inline-flex;
        align-items: center;
        gap: 12px;
        font-weight: 700;
        letter-spacing: -0.03em;
        color: var(--text-main);
      }

      .nav {
        display: flex;
        flex-wrap: wrap;
        justify-content: flex-end;
        gap: 10px;
        align-items: center;
      }

      .nav a,
      .nav button {
        padding: 11px 16px;
        border-radius: var(--radius-pill);
        color: var(--muted);
        font-size: 0.94rem;
        font-weight: 600;
        font-family: inherit;
        line-height: 1;
        border: 0;
        background: transparent;
        cursor: pointer;
        transition: var(--transition-smooth);
      }

      .nav a:hover,
      .nav a:focus-visible,
      .nav button:hover,
      .nav button:focus-visible {
        background: rgba(22, 62, 115, 0.08);
        color: var(--text);
        outline: none;
      }

      .nav a.is-active,
      .nav button.is-active {
        color: #ffffff;
        background: linear-gradient(135deg, var(--accent) 0%, #2e5fa3 100%);
        box-shadow: 0 12px 24px rgba(22, 62, 115, 0.18);
      }

      .nav-group {
        position: relative;
      }

      .nav-trigger {
        display: inline-flex;
        align-items: center;
        gap: 8px;
      }

      .nav-trigger::after {
        content: "";
        width: 8px;
        height: 8px;
        border-right: 1.8px solid currentColor;
        border-bottom: 1.8px solid currentColor;
        transform: rotate(45deg) translateY(-1px);
        opacity: 0.8;
      }

      .nav-dropdown {
        position: absolute;
        top: calc(100% + 10px);
        right: 0;
        min-width: 190px;
        padding: 10px;
        display: grid;
        gap: 6px;
        background: rgba(255, 255, 255, 0.98);
        border: 1px solid var(--line-strong);
        border-radius: 18px;
        box-shadow: 0 16px 34px rgba(15, 23, 42, 0.08);
        opacity: 0;
        pointer-events: none;
        transform: translateY(6px);
        transition: var(--transition-smooth);
      }

      .nav-group:hover .nav-dropdown,
      .nav-group:focus-within .nav-dropdown {
        opacity: 1;
        pointer-events: auto;
        transform: translateY(0);
      }

      .nav-dropdown a {
        display: block;
        width: 100%;
        border-radius: 12px;
      }

      .hero,
      .section {
        scroll-margin-top: 110px;
      }

      main {
        padding: 38px 0 88px;
      }

      .view-stage {
        position: relative;
        min-height: 70vh;
      }

      .view {
        display: none;
      }

      .view.is-active {
        display: block;
      }

      .view-header {
        display: flex;
        align-items: flex-start;
        justify-content: flex-start;
        gap: 28px;
        margin-bottom: 32px;
        padding: 34px 38px;
        border-radius: var(--radius-lg);
        background:
          linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(245, 248, 255, 0.98));
        border: 1px solid var(--line-soft);
        box-shadow: var(--shadow-soft);
      }

      .view-header h2 {
        font-size: clamp(2rem, 3vw, 3rem);
        font-weight: 700;
        letter-spacing: -0.05em;
      }

      .view-header h2 strong {
        font-weight: 800;
      }

      .hero {
        display: grid;
        grid-template-columns: minmax(0, 1.5fr) minmax(300px, 0.92fr);
        gap: 24px;
        align-items: stretch;
      }

      .panel {
        background: var(--surface);
        border: 1px solid var(--line-soft);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow);
        animation: rise 720ms ease both;
      }

      .hero-copy {
        padding: 44px;
        position: relative;
        overflow: hidden;
        background:
          linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(245, 248, 255, 0.98));
      }

      .hero-copy::after {
        content: "";
        position: absolute;
        inset: auto -120px -160px auto;
        width: 320px;
        height: 320px;
        border-radius: 999px;
        background: radial-gradient(circle, rgba(22, 62, 115, 0.12), transparent 68%);
      }

      .eyebrow {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 8px 12px;
        border-radius: var(--radius-pill);
        background: var(--brand-secondary);
        color: var(--accent-strong);
        font-size: 0.88rem;
        font-weight: 700;
      }

      h1,
      h2,
      h3 {
        margin: 0;
        letter-spacing: -0.04em;
      }

      h2 {
        font-size: clamp(1.6rem, 2vw, 2.15rem);
      }

      h3 {
        font-size: 1.22rem;
      }

      h1 {
        margin-top: 18px;
        font-size: clamp(1.95rem, 2.9vw, 2.7rem);
        line-height: 1.18;
        font-weight: 500;
      }

      h1 strong {
        font-weight: 800;
      }

      .hero-copy p {
        max-width: 720px;
        margin: 20px 0 0;
        color: var(--muted);
        font-size: 1.05rem;
      }

      .hero-points {
        margin-top: 32px;
        display: grid;
        gap: 14px;
      }

      .hero-points div {
        display: grid;
        gap: 6px;
        padding: 18px 20px;
        background: rgba(248, 251, 255, 0.92);
        border: 1px solid var(--line-soft);
        border-radius: var(--radius-sm);
        transition: var(--transition-smooth);
      }

      .hero-points div:hover {
        transform: translateY(-3px);
        box-shadow: var(--shadow-soft);
      }

      .hero-points strong {
        min-width: 0;
        color: var(--accent-strong);
        font-size: 1rem;
      }

      .hero-side {
        display: grid;
        gap: 18px;
        align-content: start;
      }

      .hero-figure,
      .contact-card,
      .summary-card {
        padding: var(--card-padding);
      }

      .hero-figure {
        padding: 0;
        overflow: hidden;
        background:
          linear-gradient(180deg, rgba(245, 248, 255, 0.98), rgba(255, 255, 255, 0.98));
      }

      .portrait-frame {
        width: 100%;
        height: 100%;
        border-radius: inherit;
        padding: 0;
        background: none;
        border: 0;
      }

      .portrait-placeholder {
        min-height: 320px;
        border-radius: 18px;
        display: grid;
        place-items: center;
        text-align: center;
        color: var(--accent-strong);
        background:
          radial-gradient(circle at top, rgba(22, 62, 115, 0.14), transparent 48%),
          linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(245, 248, 255, 0.96));
      }

      .portrait-placeholder span {
        display: block;
        font-size: 0.92rem;
        font-weight: 700;
        letter-spacing: 0.08em;
        text-transform: uppercase;
      }

      .portrait-placeholder strong {
        display: block;
        margin-top: 8px;
        font-size: 1.28rem;
      }

      .portrait-image {
        width: 100%;
        height: 100%;
        min-height: 420px;
        object-fit: cover;
        object-position: center;
        border-radius: inherit;
      }

      .section-label {
        margin-bottom: 14px;
        color: var(--text-soft);
        font-size: 0.8rem;
        font-weight: 700;
        letter-spacing: 0.12em;
        text-transform: uppercase;
      }

      .contact-list,
      .stat-list {
        display: grid;
        gap: 12px;
      }

      .contact-item,
      .stat-item {
        padding: 16px 18px;
        border-radius: var(--radius-sm);
        background: var(--surface-strong);
        border: 1px solid var(--line-soft);
        transition: var(--transition-smooth);
      }

      .contact-item:hover,
      .stat-item:hover {
        transform: translateY(-3px);
        box-shadow: var(--shadow-soft);
      }

      .contact-item span,
      .stat-item span {
        display: block;
        color: var(--muted);
        font-size: 0.84rem;
      }

      .contact-item strong,
      .stat-item strong {
        display: block;
        margin-top: 4px;
        font-size: 0.98rem;
      }

      .section {
        margin-top: var(--section-gap);
      }

      .view .section:first-child,
      .view > .hero {
        margin-top: 0;
      }

      .section-head {
        display: flex;
        align-items: end;
        justify-content: space-between;
        gap: 20px;
        margin-bottom: 20px;
      }

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

      .grid.cols-2 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .card {
        padding: var(--card-padding);
      }

      .stack-groups {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 18px;
      }

      .stack-group {
        padding: 28px;
        border-radius: var(--radius-md);
        background: var(--surface);
        border: 1px solid var(--line-soft);
        box-shadow: var(--shadow);
        animation: rise 720ms ease both;
        transition: var(--transition-smooth);
      }

      .stack-group:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow-hover);
      }

      .stack-group ul,
      .plain-list,
      .timeline-list,
      .detail-list,
      .link-list {
        margin: 0;
        padding: 0;
        list-style: none;
      }

      .stack-group ul {
        display: grid;
        gap: 12px;
        margin-top: 16px;
      }

      .stack-group li {
        padding: 0;
        border-radius: 0;
        background: transparent;
        color: var(--text-sub);
        font-weight: 500;
        line-height: 1.75;
      }

      .stack-group li strong {
        color: var(--text-main);
        font-weight: 700;
      }

      .tool-card {
        padding: 28px;
        background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(247, 250, 255, 0.98));
      }

      .tool-card .plain-list {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
      }

      .tool-card li {
        padding: 10px 14px;
        border-radius: var(--radius-pill);
        border: 1px solid var(--line-soft);
        background: rgba(255, 255, 255, 0.82);
      }

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

      .timeline-item {
        display: grid;
        grid-template-columns: 150px minmax(0, 1fr);
        gap: 22px;
        padding: 28px;
        background: var(--surface);
        border: 1px solid var(--line-soft);
        border-radius: var(--radius-md);
        box-shadow: var(--shadow);
        animation: rise 760ms ease both;
        transition: var(--transition-smooth);
      }

      .timeline-item:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow-hover);
      }

      .timeline-date {
        color: var(--accent-strong);
        font-weight: 700;
        font-size: 0.96rem;
      }

      .timeline-body h3 {
        font-size: 1.26rem;
      }

      .timeline-body .subhead {
        margin-top: 6px;
        color: var(--muted);
        font-weight: 600;
      }

      .job-role {
        display: inline-flex;
        align-items: center;
        margin-left: 10px;
        padding: 4px 10px;
        border-radius: var(--radius-pill);
        background: var(--brand-secondary);
        color: var(--brand-primary-strong);
        font-size: 0.82rem;
        font-weight: 700;
        vertical-align: middle;
      }

      .detail-list {
        margin-top: 14px;
        display: grid;
        gap: 8px;
      }

      .detail-list li {
        position: relative;
        padding-left: 18px;
        color: var(--muted);
      }

      .detail-list li::before {
        content: "";
        position: absolute;
        left: 0;
        top: 11px;
        width: 7px;
        height: 7px;
        border-radius: 999px;
        background: var(--accent);
      }

      .badge {
        display: inline-flex;
        align-items: center;
        padding: 8px 12px;
        border-radius: var(--radius-pill);
        background: var(--brand-secondary);
        color: var(--brand-primary-strong);
        font-size: 0.9rem;
        font-weight: 700;
      }

      .project-card {
        display: grid;
        gap: 26px;
        background:
          radial-gradient(circle at top right, rgba(22, 62, 115, 0.08), transparent 28%),
          linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(247, 250, 255, 0.98));
      }

      .highlight {
        border-color: var(--line-strong);
        background:
          linear-gradient(180deg, rgba(255, 255, 255, 0.99), rgba(240, 247, 255, 0.98));
        box-shadow: 0 18px 40px rgba(22, 62, 115, 0.08);
      }

      .project-card-header {
        display: grid;
        gap: 14px;
      }

      .project-meta {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
      }

      .project-meta span,
      .achievement-pill {
        display: inline-flex;
        align-items: center;
        padding: 8px 12px;
        border-radius: var(--radius-pill);
        background: var(--brand-secondary);
        font-size: 0.92rem;
        font-weight: 600;
      }

      .project-card h3 {
        font-size: clamp(1.8rem, 2vw, 2.3rem);
      }

      .project-description {
        margin: 0;
        color: var(--muted);
        font-size: 1rem;
        max-width: 42rem;
      }

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

      .link-list a {
        display: block;
        padding: 14px 16px;
        border-radius: var(--radius-sm);
        border: 1px solid var(--line-soft);
        background: rgba(255, 255, 255, 0.82);
        transition: var(--transition-smooth);
      }

      .link-list a:hover,
      .link-list a:focus-visible {
        transform: translateY(-1px);
        border-color: rgba(22, 62, 115, 0.32);
        box-shadow: var(--shadow-soft);
      }

      .link-list strong {
        display: block;
      }

      .link-list span {
        display: block;
        color: var(--muted);
        margin-top: 4px;
        font-size: 0.92rem;
      }

      .project-actions {
        display: flex;
        flex-wrap: wrap;
        gap: 12px;
      }

      .button {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        min-height: 46px;
        padding: 0 18px;
        border-radius: var(--radius-pill);
        font-weight: 700;
        transition: var(--transition-smooth);
      }

      .button:hover,
      .button:focus-visible {
        transform: translateY(-2px);
        box-shadow: var(--shadow-soft);
      }

      .button-primary {
        color: #ffffff;
        background: linear-gradient(135deg, var(--brand-primary) 0%, #2e5fa3 100%);
      }

      .button-outline {
        color: var(--brand-primary-strong);
        background: rgba(255, 255, 255, 0.9);
        border: 1px solid var(--line-strong);
      }

      .achievement-grid {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 16px;
      }

      .achievement-card {
        padding: 24px;
        border-radius: var(--radius-md);
        background: var(--surface);
        border: 1px solid var(--line-soft);
        box-shadow: var(--shadow);
        animation: rise 760ms ease both;
        transition: var(--transition-smooth);
      }

      .achievement-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow-hover);
      }

      .hero-side > *:nth-child(2),
      .stack-groups > *:nth-child(2),
      .stack-groups > *:nth-child(4),
      .achievement-grid > *:nth-child(even) {
        animation-delay: 90ms;
      }

      .timeline-list > *:nth-child(even) {
        animation-delay: 100ms;
      }

      @keyframes rise {
        from {
          opacity: 0;
          transform: translateY(16px);
        }

        to {
          opacity: 1;
          transform: translateY(0);
        }
      }

      .achievement-card h3 {
        margin-top: 16px;
        font-size: 1.16rem;
      }

      .achievement-card p {
        margin: 8px 0 0;
        color: var(--muted);
      }

      .footer {
        margin-top: 40px;
        padding: 30px 28px;
        text-align: center;
        color: var(--muted);
        background: rgba(247, 250, 255, 0.88);
      }

      @media (max-width: 980px) {
        .hero,
        .grid.cols-2,
        .stack-groups,
        .achievement-grid {
          grid-template-columns: 1fr;
        }

        .view-header {
          flex-direction: column;
          align-items: flex-start;
          padding: 28px;
        }

        .timeline-item {
          grid-template-columns: 1fr;
          gap: 10px;
        }
      }

      @media (max-width: 720px) {
        .topbar-inner,
        .section-head {
          align-items: flex-start;
          flex-direction: column;
        }

        .nav {
          justify-content: flex-start;
          width: 100%;
        }

        .nav-group {
          width: 100%;
        }

        .nav-trigger,
        .nav > a {
          width: 100%;
          justify-content: space-between;
        }

        .nav-dropdown {
          position: static;
          min-width: 0;
          margin-top: 8px;
          opacity: 1;
          pointer-events: auto;
          transform: none;
          box-shadow: none;
          display: none;
        }

        .nav-group:hover .nav-dropdown,
        .nav-group:focus-within .nav-dropdown {
          display: grid;
        }

        .hero-copy,
        .hero-figure,
        .contact-card,
        .summary-card,
        .card,
        .stack-group,
        .tool-card,
        .achievement-card,
        .timeline-item,
        .footer {
          padding: 22px;
        }

        h1 {
          font-size: 1.85rem;
        }

        .hero-points strong {
          min-width: 78px;
        }
      }