:root {
  color-scheme: dark;
  --bg: #0f131a;
  --bg-elevated: #121821;
  --surface: #171c24;
  --surface-strong: #1b212b;
  --surface-muted: #202734;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.12);
  --text-primary: #f3f5f7;
  --text-secondary: #aeb8c4;
  --text-muted: #8793a1;
  --accent: #3182f6;
  --accent-strong: #4a90ff;
  --accent-soft: rgba(49, 130, 246, 0.14);
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
  --shadow-soft: 0 10px 24px rgba(0, 0, 0, 0.18);
  --radius-xl: 22px;
  --radius-lg: 18px;
  --radius-md: 14px;
  --max-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Pretendard", "Inter", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(49, 130, 246, 0.16), transparent 24%),
    radial-gradient(circle at top right, rgba(74, 144, 255, 0.08), transparent 18%),
    linear-gradient(180deg, #11161e 0%, var(--bg) 100%);
  color: var(--text-primary);
}

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

.page-shell {
  min-height: 100vh;
}

.topbar {
  position: sticky;
  top: 12px;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(calc(var(--max-width) + 140px), calc(100% - 48px));
  margin: 0 auto;
  padding: 18px 28px;
  background: linear-gradient(180deg, rgba(15, 19, 26, 0.92), rgba(15, 19, 26, 0.72));
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(18px);
}

.brand {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.topnav {
  display: flex;
  gap: 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.topnav a {
  transition: color 0.18s ease;
}

.topnav a:hover {
  color: var(--text-primary);
}

.content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 20px 24px 80px;
}

.section {
  padding: 56px 0;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.85fr);
  gap: 24px;
  padding-top: 56px;
  align-items: stretch;
}

.hero-copy h1 {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 18px 0 20px;
  font-size: clamp(2.4rem, 5vw, 4.4rem);
  line-height: 1.12;
  letter-spacing: -0.045em;
}

.hero-copy h1 span {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: clamp(1.3rem, 2vw, 1.75rem);
  letter-spacing: -0.03em;
}

.hero-copy p,
.prose-card p,
.project-summary p,
.detail-card p,
.contact-card p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 1.03rem;
  line-height: 1.8;
}

.eyebrow,
.section-kicker,
.hero-panel-label {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: #7cb1ff;
  border: 1px solid rgba(49, 130, 246, 0.18);
  font-size: 0.85rem;
  font-weight: 700;
}

.meta-label {
  display: block;
  margin: 0 0 10px;
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 52px;
  padding: 0 22px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-weight: 600;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

.button:hover,
.text-link:hover,
.contact-icon-link:hover {
  transform: translateY(-1px);
}

.button.primary {
  background: linear-gradient(180deg, var(--accent-strong) 0%, var(--accent) 100%);
  color: #f8fbff;
  box-shadow: 0 12px 24px rgba(49, 130, 246, 0.18);
}

.button.primary:hover {
  box-shadow: 0 14px 28px rgba(49, 130, 246, 0.24);
}

.button.secondary {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--border-strong);
  color: var(--text-primary);
}

.button.secondary:hover {
  background: rgba(255, 255, 255, 0.05);
}

.card {
  background: linear-gradient(180deg, rgba(27, 32, 40, 0.96), rgba(22, 26, 32, 0.98));
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}

.hero-panel,
.prose-card,
.project-summary,
.detail-card,
.contact-card,
.skill-card {
  padding: 28px;
}

.hero-panel {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: linear-gradient(180deg, rgba(28, 34, 44, 0.98), rgba(23, 28, 36, 0.96));
}

.hero-panel ul,
.detail-list {
  margin: 20px 0 0;
  padding-left: 20px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.section-heading {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 24px;
}

.section-heading h2,
.project-summary h3,
.detail-card h3,
.skill-card h3 {
  margin: 0;
  letter-spacing: -0.03em;
}

.section-heading h2 {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  line-height: 1.28;
}

.prose-card {
  display: grid;
  gap: 18px;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.skill-card {
  background: linear-gradient(180deg, rgba(28, 34, 44, 0.98), rgba(23, 28, 36, 0.96));
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.project-value-tags {
  margin-top: 0;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.92rem;
  font-weight: 600;
}

.badge.accent {
  background: var(--accent-soft);
  border-color: rgba(49, 130, 246, 0.18);
  color: #8bbaff;
}

.project-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 20px;
}

.project-shell {
  display: grid;
  grid-template-columns: minmax(280px, 0.88fr) minmax(0, 1.12fr);
  gap: 20px;
  align-items: start;
}

.project-summary-card {
  position: sticky;
  top: 104px;
  padding: 28px;
}

.project-explorer {
  display: grid;
  gap: 16px;
}

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

.project-nav-button,
.package-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  transition: transform 0.18s ease, border-color 0.18s ease, background-color 0.18s ease, color 0.18s ease;
  cursor: pointer;
}

.project-nav-button:hover,
.package-chip:hover,
.media-preview-button:hover {
  transform: translateY(-1px);
}

.project-nav-button.is-active,
.package-chip.is-active {
  background: var(--accent-soft);
  border-color: rgba(49, 130, 246, 0.22);
  color: #dceafe;
}

.package-chip.is-highlight {
  box-shadow: inset 0 0 0 1px rgba(49, 130, 246, 0.08);
}

.project-detail-panel {
  min-height: 100%;
}

.project-detail-block,
.package-detail-stack,
.lesson-list {
  display: grid;
  gap: 18px;
}

.project-detail-header {
  display: grid;
  gap: 10px;
}

.project-detail-header h3,
.project-summary-card h3,
.insight-card h4,
.domain-card h4,
.package-detail-card h4,
.lesson-card h4,
.resolver-grid h4 {
  margin: 0;
  letter-spacing: -0.03em;
}

.project-detail-header p,
.insight-card p,
.domain-card p,
.package-detail-card p,
.lesson-card p,
.resolver-grid p,
.project-fact-item span {
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.75;
}

.project-insight-grid,
.domain-focus-grid,
.resolver-grid,
.implementation-grid {
  display: grid;
  gap: 16px;
}

.project-insight-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.implementation-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: stretch;
}

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

.resolver-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.insight-card,
.domain-card,
.timeline-card,
.media-card,
.detail-list-card,
.package-tree-card,
.package-selector-card,
.package-detail-card,
.resolver-highlight-card,
.lesson-card {
  padding: 24px;
}

.domain-card {
  display: grid;
  gap: 18px;
}

.domain-card-emphasis {
  border-color: rgba(49, 130, 246, 0.18);
  box-shadow: 0 18px 40px rgba(10, 16, 28, 0.34);
}

.domain-card-top,
.domain-section {
  display: grid;
  gap: 10px;
}

.card-section-title {
  color: var(--text-primary);
  font-size: 0.95rem;
  font-weight: 700;
}

.timeline-list {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 10px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.timeline-list.compact {
  gap: 8px;
}

.media-preview-button {
  width: 100%;
  display: grid;
  gap: 14px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  text-align: left;
}

.detail-image {
  width: 100%;
  display: block;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: #0d1015;
}

.detail-image-raw {
  max-height: 640px;
  object-fit: contain;
}

.media-preview-caption {
  color: #8ebcff;
  font-weight: 600;
}

.package-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
  gap: 18px;
}

.package-tree {
  margin: 0;
  overflow: auto;
  padding: 18px;
  border-radius: 14px;
  background: rgba(8, 11, 17, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.06);
  color: #dbe5f2;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.93rem;
  line-height: 1.7;
}

.package-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.package-detail-top,
.project-fact-list,
.project-fact-item {
  display: grid;
}

.related-package-card {
  padding: 24px;
}

.related-package-list {
  margin: 16px 0 0;
  padding-left: 20px;
  display: grid;
  gap: 8px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.project-fact-list {
  gap: 12px;
}

.project-fact-item {
  gap: 4px;
  padding: 14px 16px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
}

.project-fact-item strong {
  color: var(--text-primary);
  font-size: 1rem;
}

.mini-kicker {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  color: #dbe5f2;
  font-size: 0.8rem;
  font-weight: 700;
}

.resolver-highlight-card code {
  color: #d9ebff;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

.resolver-stack {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 16px;
}

.resolver-item {
  padding: 18px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
}

.resolver-item h4,
.resolver-item p {
  margin: 0;
}

.resolver-item h4 {
  margin-bottom: 8px;
}

.implementation-card,
.resolver-highlight-card,
.lesson-card,
.package-detail-card,
.related-package-card {
  height: auto;
  min-height: 0;
}

.image-modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(6, 8, 12, 0.72);
  backdrop-filter: blur(8px);
}

.image-modal-card {
  position: relative;
  width: min(1120px, 100%);
  max-height: calc(100vh - 48px);
  padding: 16px;
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(27, 32, 40, 0.98), rgba(22, 26, 32, 0.98));
  border: 1px solid var(--border);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.44);
}

.image-modal-image {
  width: 100%;
  max-height: calc(100vh - 120px);
  object-fit: contain;
  display: block;
  border-radius: 16px;
}

.image-modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  height: 40px;
  padding: 0 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(12, 15, 21, 0.88);
  color: var(--text-primary);
  cursor: pointer;
}

.project-summary-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}

.project-summary h3 {
  font-size: 1.8rem;
  margin-bottom: 10px;
}

.meta-group {
  display: grid;
  gap: 24px;
  margin-top: 28px;
}

.project-details {
  display: grid;
  gap: 20px;
}

.detail-card h3,
.skill-card h3 {
  font-size: 1.15rem;
}

.text-link {
  color: #7cb1ff;
  font-weight: 600;
  transition: transform 0.18s ease, color 0.18s ease;
}

.text-link:hover {
  color: #a4c8ff;
}

.contact-card {
  display: grid;
  gap: 22px;
}

.contact-icon-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 4px;
}

.contact-icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(28, 34, 44, 0.98), rgba(23, 28, 36, 0.96));
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
  transition: transform 0.18s ease, background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.contact-icon-link:hover {
  transform: translateY(-1px);
  border-color: rgba(74, 144, 255, 0.28);
  background: linear-gradient(180deg, rgba(31, 38, 49, 0.98), rgba(26, 31, 40, 0.96));
  color: #ffffff;
}

.contact-icon-link:focus-visible {
  outline: 2px solid rgba(74, 144, 255, 0.8);
  outline-offset: 3px;
}

.contact-icon-svg,
.contact-icon-image {
  width: 23px;
  height: 23px;
  display: block;
}

@media (max-width: 960px) {
  .hero,
  .project-layout,
  .skills-grid {
    grid-template-columns: 1fr;
  }

  .topbar {
    width: min(calc(var(--max-width) + 96px), calc(100% - 32px));
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding: 18px 22px;
  }

  .topnav {
    flex-wrap: wrap;
    gap: 14px 18px;
  }

  .project-shell,
  .package-layout,
  .project-insight-grid,
  .domain-focus-grid,
  .resolver-grid,
  .implementation-grid {
    grid-template-columns: 1fr;
  }

  .project-summary-card {
    position: static;
  }
}

@media (max-width: 640px) {
  .content {
    padding-left: 18px;
    padding-right: 18px;
  }

  .topbar {
    width: calc(100% - 24px);
    padding: 16px 18px;
  }

  .section {
    padding: 42px 0;
  }

  .hero {
    padding-top: 28px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .hero-panel,
  .prose-card,
  .project-summary,
  .detail-card,
  .contact-card,
  .skill-card,
  .project-summary-card,
  .insight-card,
  .domain-card,
  .timeline-card,
  .media-card,
  .detail-list-card,
  .package-tree-card,
  .package-selector-card,
  .package-detail-card,
  .resolver-highlight-card,
  .lesson-card {
    padding: 22px;
    border-radius: var(--radius-lg);
  }

  .project-nav-row,
  .package-chip-row {
    gap: 8px;
  }

  .project-nav-button,
  .package-chip {
    width: 100%;
    justify-content: flex-start;
  }

  .image-modal-backdrop {
    padding: 14px;
  }

  .image-modal-card {
    padding: 12px;
    border-radius: 18px;
  }

  .detail-image-raw {
    max-height: 420px;
  }
}