:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --surface-strong: #eaf2ff;
  --primary: #111827;
  --primary-dark: #0b1220;
  --accent: #155eef;
  --text: #111827;
  --muted: #526075;
  --line: #cbd5e1;
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Trebuchet MS", "Malgun Gothic", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.18;
  background-image: radial-gradient(#155eef 0.6px, transparent 0.6px);
  background-size: 12px 12px;
  mask-image: linear-gradient(to bottom, black, transparent 75%);
}

.site-header,
.site-footer {
  width: min(1240px, calc(100% - 48px));
  margin: 0 auto;
}

.site-header {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  padding: 28px 0;
  position: sticky;
  top: 0;
  background: rgba(244, 247, 251, 0.94);
  backdrop-filter: blur(10px);
  z-index: 1;
}

.brand {
  color: var(--primary);
  text-decoration: none;
  font-size: 1.6rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.brand span,
.accent { color: var(--accent); }

.container {
  width: min(1240px, 100%);
  margin: 0 auto;
  display: grid;
  gap: 34px;
  padding: 34px 20px 60px;
  justify-items: center;
  position: relative;
  z-index: 1;
}

.card {
  width: 100%;
  min-height: min(720px, calc(100vh - 150px));
  background: var(--surface);
  border: 1px solid var(--line);
  border-top: 6px solid var(--accent);
  border-radius: 4px;
  box-shadow: var(--shadow);
  padding: 32px 44px 40px;
  backdrop-filter: blur(10px);
  scroll-margin-top: 110px;
}

.content-card { padding-top: 38px; }

.profile-card { order: -1; }

.toc-card { order: 0; }

.toc-list {
  display: grid;
  gap: 14px;
  margin-top: 34px;
}

.toc-list a {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr) minmax(220px, 0.7fr);
  align-items: center;
  gap: 16px;
  min-height: 78px;
  padding: 18px 22px;
  border: 2px solid var(--line);
  border-left: 6px solid var(--accent);
  border-radius: 4px;
  background: var(--surface);
  color: var(--primary);
  text-decoration: none;
  transition: border-color 160ms ease, transform 160ms ease;
}

.toc-list a:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateX(6px);
}

.toc-list strong {
  color: var(--accent);
  font: 700 0.8rem Arial, sans-serif;
  letter-spacing: 0.1em;
}

.toc-list span {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: 0.05em;
}

.toc-list small {
  color: var(--muted);
  font: 700 0.78rem Arial, sans-serif;
  letter-spacing: 0.08em;
}

.display-title {
  margin: 0 0 24px;
  font-size: clamp(2.5rem, 5vw, 4.4rem);
  font-weight: 900;
  letter-spacing: 0;
  line-height: 1.12;
}

.section-copy {
  max-width: 650px;
  margin: 0 0 28px;
  color: var(--muted);
  font-size: 1.18rem;
  font-weight: 600;
  line-height: 1.85;
}

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

.timeline {
  display: grid;
  gap: 0;
  margin-top: 34px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 18px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.timeline-item:last-child { border-bottom: 1px solid var(--line); }

.timeline-year {
  color: var(--accent);
  font: 0.7rem Arial, sans-serif;
  letter-spacing: 0.12em;
}

.timeline-item h2 { margin-bottom: 8px; }

.timeline-item p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.vision-note {
  padding: 22px;
  background: var(--surface-strong);
  border-left: 3px solid var(--accent);
}

.vision-note p:last-child {
  margin: 0;
  color: var(--primary-dark);
  font-size: 1.12rem;
  font-weight: 600;
  line-height: 1.7;
}

.hero-line {
  display: flex;
  justify-content: space-between;
  padding-bottom: 22px;
  margin-bottom: 38px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font: 0.65rem Arial, sans-serif;
  letter-spacing: 0.16em;
}

.profile-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  margin-bottom: 30px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font: 0.68rem Arial, sans-serif;
  letter-spacing: 0.16em;
}

h1 {
  margin: 0;
  font-size: clamp(3.4rem, 8vw, 6rem);
  font-weight: 900;
  line-height: 1.1;
}

.subtitle {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.avatar {
  width: 112px;
  height: 112px;
  position: relative;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-weight: 900;
  font-size: 1.9rem;
  box-shadow: 12px 12px 0 var(--accent);
  font-family: Arial, sans-serif;
}

.avatar::before {
  content: "";
  position: absolute;
  width: 112px;
  height: 112px;
  border: 1px solid var(--accent);
  border-radius: 50%;
  transform: translate(8px, 8px);
}

.intro {
  margin: 0 0 24px;
  padding: 16px 18px;
  background: var(--surface-strong);
  border-left: 3px solid var(--accent);
  border-radius: 2px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary-dark);
  line-height: 1.6;
}

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

.info-box,
.contact-box {
  background: #f8fbff;
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 20px 18px;
}

h2 {
  margin: 0 0 14px;
  font-size: 1.18rem;
  font-weight: 800;
  color: var(--primary-dark);
}

.section-number {
  margin: 0 0 8px;
  color: var(--accent);
  font: 0.68rem Arial, sans-serif;
  letter-spacing: 0.12em;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tags span {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 2px;
  background: var(--primary);
  color: #ffffff;
  font-size: 1rem;
  font-weight: 800;
}

.info-box p {
  margin: 0;
  font-size: 1.08rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--text);
}

.contact-box {
  margin-top: 20px;
}

.contact-box ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 14px;
}

.contact-box li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  font-size: 1rem;
}

.label {
  min-width: 72px;
  font-weight: 700;
  color: var(--primary-dark);
}

.contact-box a {
  color: var(--text);
  text-decoration: none;
  border-bottom: 2px solid rgba(21, 94, 239, 0.35);
}

.next-link {
  display: flex;
  justify-content: space-between;
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--primary);
  text-decoration: none;
  font-family: Arial, sans-serif;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.next-link span { color: var(--accent); font-size: 1.2rem; }

.site-footer {
  display: flex;
  justify-content: space-between;
  padding: 0 0 24px;
  color: var(--muted);
  font: 0.62rem Arial, sans-serif;
  letter-spacing: 0.1em;
}

.contact-box a:hover {
  color: var(--primary);
}

@media (max-width: 640px) {
  .card {
    padding: 24px 20px 30px;
  }

  .profile-header {
    flex-direction: column;
    align-items: flex-start;
  }

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

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

  .toc-list a { grid-template-columns: 40px 1fr; gap: 10px; }
  .toc-list small { grid-column: 2; }

  .avatar {
    width: 82px;
    height: 82px;
    font-size: 1.4rem;
  }

  .avatar::before { width: 82px; height: 82px; }
  .site-footer { display: block; line-height: 1.8; }
  .site-footer span { display: block; }
}