:root {
  --bg: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --primary: #2563eb;
  --card: #f3f4f6;
  --border: #e5e7eb;
}

[data-theme="dark"] {
  --bg: #0b1220;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --primary: #60a5fa;
  --card: #111827;
  --border: #1f2937;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Sans KR", system-ui, -apple-system, Segoe UI, Roboto, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  position: sticky;
  top: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: color-mix(in oklab, var(--bg) 92%, transparent);
  backdrop-filter: saturate(1.2) blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

.logo {
  font-weight: 700;
  color: var(--text);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.theme-toggle {
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
}

.hero {
  max-width: 960px;
  margin: 0 auto;
  padding: 96px 20px 48px;
  text-align: center;
}

.hero h1 {
  margin: 0 0 8px 0;
  font-size: clamp(28px, 5vw, 44px);
}

.hero p {
  margin: 0 auto 20px;
  color: var(--muted);
  max-width: 700px;
}

.cta {
  display: inline-flex;
  gap: 12px;
}

.btn {
  display: inline-block;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--bg);
}

.btn.primary {
  background: var(--primary);
  color: #fff;
  border-color: transparent;
}

.section {
  max-width: 960px;
  margin: 0 auto;
  padding: 48px 20px;
}

.skills {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
  list-style: none;
  padding: 0;
}

.skills li {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  background: var(--card);
}

/* 강제로 새 행의 첫 칸에서 시작 */
.skills li.break-row-start {
  grid-column: 1;
}

.projects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  background: var(--card);
}

.card h3 {
  margin-top: 0;
}

.card-link {
  display: inline-block;
  margin-top: 8px;
}

.contact-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.contact-form label {
  display: grid;
  gap: 6px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
}

.contact-form button {
  grid-column: 1 / -1;
  justify-self: start;
}

@media (max-width: 640px) {
  .contact-form {
    grid-template-columns: 1fr;
  }
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 20px;
  text-align: center;
  color: var(--muted);
}