:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --text: #16181d;
  --muted: #5b6472;
  --accent: #1d4ed8;
  --accent-hover: #1740b4;
  --border: #e4e7ec;
  --radius: 10px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 32px;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.2px;
}

.nav nav { display: flex; gap: 26px; }

.nav nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
}

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

main { max-width: 860px; margin: 0 auto; padding: 0 24px 90px; }

.hero { padding: 110px 0 80px; }

.kicker {
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.hero h1 {
  font-size: clamp(36px, 6vw, 58px);
  line-height: 1.08;
  letter-spacing: -1px;
  font-weight: 750;
}

.hero h2 {
  font-size: clamp(19px, 3vw, 26px);
  color: var(--muted);
  font-weight: 500;
  margin-top: 10px;
  letter-spacing: -0.2px;
}

.tagline { margin-top: 20px; font-size: 17px; max-width: 600px; color: var(--text); }

.hero-links { display: flex; gap: 12px; margin-top: 30px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 11px 24px;
  border-radius: 8px;
  border: 1px solid var(--border);
  color: var(--text);
  background: #fff;
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
}

.btn:hover { border-color: var(--text); }

.btn.solid { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.solid:hover { background: var(--accent-hover); }

.block { padding: 64px 0; border-top: 1px solid var(--border); }

.section-title {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.3px;
  margin-bottom: 28px;
}

.prose { white-space: pre-line; color: var(--text); max-width: 680px; }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
}

.skill-card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}

.skill-card h4 { font-size: 15px; margin-bottom: 12px; }

.skill-card ul { list-style: none; }

.skill-card li {
  font-size: 14px;
  color: var(--muted);
  padding: 3px 0;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}

.project-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: box-shadow 0.2s, transform 0.2s;
}

.project-card:hover {
  box-shadow: 0 8px 24px rgba(22, 24, 29, 0.08);
  transform: translateY(-2px);
}

.project-card h4 { font-size: 16px; letter-spacing: -0.2px; }
.project-card p { font-size: 14px; color: var(--muted); flex: 1; }

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

.tech span {
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  padding: 3px 10px;
  border-radius: 20px;
}

.project-link { font-size: 14px; color: var(--accent); text-decoration: none; font-weight: 600; }
.project-link:hover { text-decoration: underline; }

.exp-item { padding: 24px 0; border-bottom: 1px solid var(--border); }
.exp-item:last-child { border-bottom: none; }

.exp-head { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 6px; }
.exp-head h4 { font-size: 16px; letter-spacing: -0.2px; }
.exp-period { font-size: 13px; color: var(--muted); font-weight: 500; }
.exp-org { font-size: 14px; color: var(--muted); margin: 2px 0 10px; }
.exp-item ul { margin-left: 18px; color: var(--text); font-size: 14px; }
.exp-item li { margin-bottom: 6px; }

footer {
  text-align: center;
  padding: 36px 20px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
  background: var(--bg-soft);
}

/* ---------- Admin ---------- */

.admin-wrap { max-width: 760px; margin: 0 auto; padding: 60px 24px 80px; }

.gate {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
  box-shadow: 0 4px 16px rgba(22, 24, 29, 0.05);
}

.gate h1 { font-size: 22px; margin-bottom: 8px; letter-spacing: -0.3px; }
.gate p { color: var(--muted); font-size: 14px; margin-bottom: 22px; }

.field { margin-bottom: 16px; text-align: left; }
.field label { display: block; font-size: 13px; font-weight: 600; color: var(--muted); margin-bottom: 6px; }

input[type="text"], input[type="password"], input[type="email"], textarea {
  width: 100%;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 10px 14px;
  font-size: 14px;
  font-family: inherit;
}

textarea { min-height: 110px; resize: vertical; }

input:focus, textarea:focus { outline: none; border-color: var(--accent); }

button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 10px 22px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

button:hover { background: var(--accent-hover); }
button.ghost { background: #fff; color: var(--muted); border: 1px solid var(--border); }
button.ghost:hover { color: var(--text); border-color: var(--text); background: #fff; }
button.danger { background: #fff; color: #dc2626; border: 1px solid #fecaca; }
button.danger:hover { background: #fef2f2; }
button.small { padding: 6px 14px; font-size: 12px; }

.error { color: #dc2626; font-size: 13px; margin-top: 10px; min-height: 20px; }
.okmsg { color: #15803d; font-size: 13px; margin-top: 10px; min-height: 20px; }

.editor-section {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  margin-bottom: 20px;
  box-shadow: 0 2px 8px rgba(22, 24, 29, 0.04);
}

.editor-section h3 { font-size: 16px; margin-bottom: 18px; }

.repeat-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 14px;
  background: var(--bg-soft);
}

.repeat-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.repeat-head strong { font-size: 14px; }

.admin-bar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 28px; }
.admin-bar h1 { font-size: 22px; letter-spacing: -0.3px; }

@media (max-width: 640px) {
  .nav nav { display: none; }
  .hero { padding: 72px 0 56px; }
}