/* ===== Design tokens ===== */
:root {
  --bg: #f2f2f4;
  --text: #111214;
  --text-muted: #5f6168;
  --accent: #111214;
  --accent-2: #4a4c55;
  --accent-soft: rgba(17, 18, 20, 0.07);
  --accent-glow: rgba(17, 18, 20, 0.22);

  /* glass */
  --glass: rgba(255, 255, 255, 0.5);
  --glass-strong: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.85);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  --glass-blur: 18px;

  --radius: 18px;
  --max-w: 880px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0c0e;
    --text: #f2f2f4;
    --text-muted: #9a9ba3;
    --accent: #f2f2f4;
    --accent-2: #b9bac2;
    --accent-soft: rgba(255, 255, 255, 0.1);
    --accent-glow: rgba(255, 255, 255, 0.12);

    --glass: rgba(255, 255, 255, 0.05);
    --glass-strong: rgba(255, 255, 255, 0.09);
    --glass-border: rgba(255, 255, 255, 0.14);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
  }
}

/* ===== Base ===== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  position: relative;
  overflow-x: hidden;
}

/* ===== 점 커서 (마우스 있는 기기에서만) ===== */
@media (hover: hover) and (pointer: fine) {
  body { cursor: none; }
  a, button { cursor: none; }
  .cursor {
    position: fixed;
    top: 0; left: 0;
    z-index: 9999;
    width: 8px; height: 8px;
    margin: -4px 0 0 -4px;
    border-radius: 50%;
    background: var(--text);
    pointer-events: none;
    transition: width .15s, height .15s, margin .15s, opacity .3s;
    opacity: 0;
  }
  .cursor.visible { opacity: 1; }
  .cursor.hover { width: 14px; height: 14px; margin: -7px 0 0 -7px; }
  .cursor.down  { width: 6px;  height: 6px;  margin: -3px 0 0 -3px; }
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
h1, h2, h3 { line-height: 1.25; margin: 0; }
p { margin: 0 0 1em; }
ul { margin: 0; padding: 0; list-style: none; }

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* 공통 유리 패널 */
.glass {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow), inset 0 1px 0 rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(160%);
}

/* ===== Header / Nav ===== */
.site-header {
  position: sticky;
  top: 12px;
  z-index: 100;
  padding: 0 20px;
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  padding: 0 8px 0 18px;
  border-radius: 999px;
  background: var(--glass-strong);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow), inset 0 1px 0 rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(160%);
}
.nav-brand { font-weight: 700; color: var(--text); font-size: 1.05rem; font-family: ui-monospace, "Cascadia Code", Consolas, monospace; }
.nav-links { display: flex; gap: 2px; }
.nav-links a {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 999px;
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 500;
  transition: background .15s, color .15s;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--text);
  background: rgba(255, 255, 255, 0.45);
  text-decoration: none;
}
@media (prefers-color-scheme: dark) {
  .nav-links a:hover, .nav-links a.active { background: rgba(255, 255, 255, 0.1); }
}
.nav-links .nav-cta {
  color: var(--bg);
  font-weight: 600;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 4px 14px var(--accent-glow);
}
.nav-links .nav-cta:hover { filter: brightness(1.1); color: var(--bg); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  padding: 10px;
  cursor: pointer;
}
.nav-toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; }

/* ===== Hero ===== */
.hero { padding: 96px 20px 56px; }
.hero-title {
  font-size: clamp(2.2rem, 6vw, 3.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}
.hero-handle {
  font-family: ui-monospace, "Cascadia Code", "JetBrains Mono", Consolas, monospace;
  font-size: clamp(2.8rem, 9vw, 5rem);
  letter-spacing: -0.03em;
  background: linear-gradient(120deg, var(--text) 0%, var(--text) 45%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-handle::before { content: "@"; }
.hero-tagline { font-size: 1.15rem; color: var(--text-muted); max-width: 600px; margin-bottom: 28px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 11px 20px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform .15s, box-shadow .15s, filter .15s;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--bg);
  box-shadow: 0 6px 20px var(--accent-glow);
}
.btn-primary:hover { filter: brightness(1.1); }
.btn-ghost {
  color: var(--text);
  background: var(--glass);
  border-color: var(--glass-border);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
}
.btn-ghost:hover { background: var(--glass-strong); }

/* ===== Sections: 각 섹션이 하나의 유리 패널 ===== */
.section {
  margin: 24px auto;
  padding: 40px 36px;
  border-radius: var(--radius);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow), inset 0 1px 0 rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(160%);
}
.section.container { max-width: var(--max-w); }
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 24px;
  letter-spacing: -0.01em;
}
.section-title::before { content: "# "; color: var(--accent); }

/* About */
.about-grid { display: grid; grid-template-columns: 160px 1fr; gap: 32px; align-items: start; }
.about-grid.no-photo { grid-template-columns: 1fr; }
.about-photo {
  width: 160px; height: 160px;
  object-fit: cover;
  border-radius: 50%;
  border: 3px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}
.about-text p { font-size: 1.05rem; }

/* Experience timeline */
.timeline { display: flex; flex-direction: column; gap: 28px; }
.timeline-item { display: grid; grid-template-columns: 160px 1fr; gap: 24px; }
.timeline-meta { display: flex; flex-direction: column; color: var(--text-muted); font-size: 0.9rem; }
.timeline-date { font-weight: 600; color: var(--text); }
.timeline-body h3 { font-size: 1.15rem; margin-bottom: 6px; }
.timeline-body .role { font-weight: 500; color: var(--text-muted); }
.bullets { list-style: disc; padding-left: 20px; margin: 8px 0 12px; color: var(--text-muted); }
.bullets li { margin-bottom: 4px; }

/* 태그 칩 */
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tags span {
  font-size: 0.78rem;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 500;
  border: 1px solid var(--accent-soft);
}

/* Projects — 패널 안의 유리 카드 */
.project-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(360px, 1fr)); gap: 20px; }
.project-card {
  border-radius: 16px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  background: var(--glass-strong);
  border: 1px solid var(--glass-border);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.06), inset 0 1px 0 rgba(255, 255, 255, 0.5);
  transition: transform .2s ease, box-shadow .2s ease;
}
.project-card:hover { transform: translateY(-4px); box-shadow: 0 14px 34px rgba(0, 0, 0, 0.14); }
.project-thumb { width: 100%; aspect-ratio: 5 / 3; object-fit: cover; background: rgba(255,255,255,0.25); display: block; }
.project-body { padding: 14px 16px 16px; display: flex; flex-direction: column; flex: 1; }
.project-body h3 { font-size: 1.05rem; margin-bottom: 4px; }
.project-meta { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 6px; }
.project-desc { color: var(--text-muted); font-size: 0.88rem; margin-bottom: 4px; }
.project-links { margin-top: auto; padding-top: 8px; display: flex; gap: 16px; font-weight: 600; font-size: 0.85rem; }

/* Other projects */
.subsection-title {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-muted);
  margin: 32px 0 10px;
}
.mini-projects { display: flex; flex-direction: column; gap: 8px; }
.mini-projects li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 16px;
  border-radius: 12px;
  background: var(--glass-strong);
  border: 1px solid var(--glass-border);
  transition: transform .15s;
}
.mini-projects li:hover { transform: translateX(3px); }
.mini-projects a { font-weight: 600; color: var(--text); }
.mini-projects a:hover { color: var(--accent); }
.mini-desc { display: block; font-size: 0.85rem; color: var(--text-muted); margin-top: 2px; }
.mini-meta { font-size: 0.8rem; color: var(--text-muted); white-space: nowrap; }

/* Skills */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 16px; }
.skill-group {
  padding: 16px 18px;
  border-radius: 14px;
  background: var(--glass-strong);
  border: 1px solid var(--glass-border);
}
.skill-group h3 { font-size: 0.78rem; text-transform: uppercase; letter-spacing: .08em; color: var(--accent); margin-bottom: 10px; }
.skill-group li { padding: 5px 0; font-size: 0.95rem; }
.skill-group li::before { content: "·"; color: var(--accent); margin-right: 8px; font-weight: 700; }

/* Awards / Education */
.simple-list { display: flex; flex-direction: column; gap: 20px; }
.simple-list li { display: grid; grid-template-columns: 160px 1fr; gap: 24px; }
.simple-meta { color: var(--text-muted); font-weight: 600; font-size: 0.9rem; }
.simple-body h3 { font-size: 1.05rem; margin-bottom: 4px; }
.simple-body p { color: var(--text-muted); margin: 0; }

/* Contact */
.contact-intro { color: var(--text-muted); font-size: 1.05rem; }
.contact-list { display: flex; flex-wrap: wrap; gap: 12px; }
.contact-list a {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 999px;
  color: var(--text);
  font-weight: 500;
  background: var(--glass-strong);
  border: 1px solid var(--glass-border);
  transition: transform .15s, box-shadow .15s;
}
.contact-list a:hover { text-decoration: none; transform: translateY(-2px); box-shadow: var(--glass-shadow); }

/* Footer */
.site-footer { padding: 40px 0 32px; color: var(--text-muted); font-size: 0.85rem; text-align: center; }
.site-footer p { margin: 0; }

/* ===== Responsive ===== */
@media (max-width: 720px) {
  .site-header { top: 8px; padding: 0 12px; }
  .nav-toggle { display: flex; }
  .nav-links {
    display: none;
    position: absolute;
    top: 64px; left: 12px; right: 12px;
    flex-direction: column;
    padding: 10px;
    border-radius: 16px;
    background: var(--glass-strong);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    backdrop-filter: blur(var(--glass-blur)) saturate(160%);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  }
  .nav-links.open { display: flex; }
  .nav-links a { display: block; padding: 10px 12px; border-radius: 10px; }

  .hero { padding: 64px 20px 40px; }
  .section { padding: 28px 20px; margin: 16px 12px; }
  .project-grid { grid-template-columns: 1fr; }
  .about-grid, .timeline-item, .simple-list li { grid-template-columns: 1fr; gap: 12px; }
  .about-photo { width: 120px; height: 120px; }
  .timeline-meta { flex-direction: row; gap: 12px; }
  .mini-projects li { flex-direction: column; gap: 4px; }
}