/* ===== 토큰 ===== */
:root {
  --bg: #0d1117;
  --bg-elev: #161b22;
  --border: #262c36;
  --text: #e6edf3;
  --text-dim: #9aa7b4;
  --accent: #6ea8fe;
  --accent-strong: #3b82f6;
  --radius: 14px;
  --maxw: 900px;
  --font: "Inter", system-ui, -apple-system, "Segoe UI", "Malgun Gothic", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.accent { color: var(--accent); }

/* ===== 네비게이션 ===== */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(13, 17, 23, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.nav__logo { font-family: var(--mono); font-weight: 600; color: var(--text); }
.nav__logo:hover { text-decoration: none; color: var(--accent); }
.nav__links { display: flex; gap: 22px; }
.nav__links a { color: var(--text-dim); font-size: 0.95rem; }
.nav__links a:hover, .nav__links a.is-active { color: var(--text); text-decoration: none; }

.nav__toggle { display: none; background: none; border: 0; cursor: pointer; flex-direction: column; gap: 5px; padding: 8px; }
.nav__toggle span { width: 22px; height: 2px; background: var(--text); display: block; transition: 0.2s; }

/* ===== 히어로 ===== */
.hero { padding: 90px 20px 70px; }
.hero__eyebrow { font-family: var(--mono); color: var(--accent); font-size: 0.85rem; letter-spacing: 0.05em; }
.hero__title { font-size: clamp(1.9rem, 5vw, 2.8rem); font-weight: 700; margin: 14px 0 18px; line-height: 1.25; }
.hero__desc { color: var(--text-dim); max-width: 620px; font-size: 1.05rem; }
.hero__actions { display: flex; gap: 12px; margin: 28px 0 20px; flex-wrap: wrap; }
.hero__visits { font-size: 0.85rem; color: var(--text-dim); font-family: var(--mono); }
.hero__visits span { color: var(--text); }

/* ===== 버튼 ===== */
.btn {
  display: inline-block; padding: 11px 20px; border-radius: 10px;
  font-weight: 600; font-size: 0.95rem; cursor: pointer; border: 1px solid transparent;
  transition: transform 0.08s ease, background 0.2s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn--primary { background: var(--accent-strong); color: #fff; }
.btn--primary:hover { background: #2f74e0; }
.btn--ghost { border-color: var(--border); color: var(--text); }
.btn--ghost:hover { border-color: var(--accent); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

/* ===== 섹션 공통 ===== */
.section { padding: 56px 20px; border-top: 1px solid var(--border); }
.section__title { font-size: 1.5rem; font-weight: 700; margin-bottom: 22px; }
.section__title::before { content: "# "; color: var(--accent); font-family: var(--mono); }
.section__lead { color: var(--text-dim); margin-bottom: 24px; }

/* ===== 소개 ===== */
.about { display: grid; grid-template-columns: 1fr 260px; gap: 32px; }
.about__text p { color: var(--text-dim); margin-bottom: 16px; }
.about__facts { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.about__facts li { color: var(--text-dim); font-size: 0.95rem; }
.about__facts strong { color: var(--text); display: inline-block; width: 72px; }
.about__card { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; height: fit-content; }
.about__card-row { display: flex; justify-content: space-between; padding: 9px 0; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
.about__card-row:last-child { border-bottom: 0; }
.about__card-row span { color: var(--text-dim); }

/* ===== 기술 ===== */
.skills { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.skills__group { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.skills__group h3 { font-size: 1rem; margin-bottom: 12px; }
.skills__group ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.skills__group li { color: var(--text-dim); font-size: 0.92rem; font-family: var(--mono); }

/* ===== 프로젝트 ===== */
.projects { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.project { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; display: flex; flex-direction: column; gap: 12px; }
.project__head { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.project__head h3 { font-size: 1.1rem; }
.project__tag { font-size: 0.72rem; font-family: var(--mono); color: var(--accent); border: 1px solid var(--border); padding: 3px 8px; border-radius: 999px; white-space: nowrap; }
.project p { color: var(--text-dim); font-size: 0.95rem; }
.project__stack { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; }
.project__stack li { font-size: 0.75rem; font-family: var(--mono); color: var(--text-dim); background: var(--bg); border: 1px solid var(--border); padding: 2px 8px; border-radius: 6px; }
.project__links { display: flex; gap: 14px; margin-top: auto; font-size: 0.9rem; }

/* ===== 방명록 ===== */
.gb-form { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 24px; }
.gb-form__row { margin-bottom: 12px; }
.gb-form input, .gb-form textarea {
  width: 100%; background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
  padding: 10px 12px; color: var(--text); font: inherit; font-size: 0.95rem; resize: vertical;
}
.gb-form input:focus, .gb-form textarea:focus { outline: 2px solid var(--accent); outline-offset: 0; }
.gb-status { margin-top: 10px; font-size: 0.85rem; color: var(--text-dim); min-height: 1.2em; }
.gb-status.is-error { color: #ff7b72; }
.gb-status.is-ok { color: #56d364; }

.gb-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.gb-list li { background: var(--bg-elev); border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; }
.gb-list .gb-meta { display: flex; justify-content: space-between; font-size: 0.8rem; color: var(--text-dim); margin-bottom: 6px; font-family: var(--mono); }
.gb-list .gb-name { color: var(--text); font-weight: 600; }
.gb-list .gb-body { color: var(--text-dim); font-size: 0.95rem; white-space: pre-wrap; word-break: break-word; }
.gb-empty { color: var(--text-dim); font-size: 0.9rem; }

/* ===== 연락처 ===== */
.contact { display: flex; flex-wrap: wrap; gap: 12px; }
.contact__item { background: var(--bg-elev); border: 1px solid var(--border); border-radius: 10px; padding: 12px 16px; color: var(--text); font-size: 0.95rem; }
.contact__item:hover { border-color: var(--accent); text-decoration: none; }

/* ===== 푸터 ===== */
.footer { border-top: 1px solid var(--border); padding: 30px 20px; text-align: center; color: var(--text-dim); font-size: 0.85rem; }

/* ===== 스크롤 애니메이션 ===== */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.5s ease, transform 0.5s ease; }
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }

/* ===== 반응형 ===== */
@media (max-width: 720px) {
  .nav__links {
    position: absolute; top: 64px; left: 0; right: 0;
    background: var(--bg-elev); border-bottom: 1px solid var(--border);
    flex-direction: column; padding: 16px 20px; gap: 14px;
    transform: translateY(-120%); transition: transform 0.25s ease;
  }
  .nav__links.is-open { transform: translateY(0); }
  .nav__toggle { display: flex; }
  .about, .skills, .projects { grid-template-columns: 1fr; }
}