/* ============================================
   좀비잡초 (ZOMBIE JAPCHO) — main stylesheet
   ============================================ */
:root {
  --bg: #0d1117;
  --bg-soft: #131a22;
  --panel: #1a232e;
  --line: #263241;
  --text: #e6edf3;
  --text-dim: #94a3b3;
  --accent: #4ade80;      /* 잡초 그린 */
  --accent-deep: #22c55e;
  --accent-dark: #14532d;
  --yt: #ff0033;
  --radius: 14px;
  --maxw: 1120px;
  --font-kr: "Noto Sans KR", sans-serif;
  --font-en: "Archivo", "Noto Sans KR", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-kr);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.accent { color: var(--accent); }

/* ---------- Header ---------- */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s;
}
.header.scrolled { border-bottom-color: var(--line); }
.header-inner {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  -webkit-touch-callout: none; -webkit-user-select: none; user-select: none; /* 길게 누르기용 */
}
.logo-mark { font-size: 1.5rem; }
.logo-text {
  font-weight: 900; font-size: 1.15rem; letter-spacing: -0.02em;
  display: flex; flex-direction: column; line-height: 1.15;
}
.logo-text em {
  font-family: var(--font-en); font-style: normal; font-weight: 600;
  font-size: 0.6rem; letter-spacing: 0.22em; color: var(--accent);
}
.nav { display: flex; gap: 28px; }
.nav a {
  font-family: var(--font-en); font-weight: 600; font-size: 0.82rem;
  letter-spacing: 0.08em; color: var(--text-dim);
  transition: color .2s;
}
.nav a:hover { color: var(--accent); }
.nav a.nav-yt { color: var(--yt); }
.nav a.nav-yt:hover { color: #ff4d6d; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; }
.nav-toggle span {
  display: block; width: 22px; height: 2px; background: var(--text);
  margin: 5px 0; border-radius: 2px; transition: .3s;
}

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  text-align: center; padding: 120px 24px 80px;
}
.hero-bg {
  position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(ellipse 60% 45% at 50% 0%, rgba(74, 222, 128, 0.13), transparent),
    radial-gradient(ellipse 45% 35% at 85% 85%, rgba(34, 197, 94, 0.07), transparent),
    var(--bg);
}
.hero-eyebrow {
  font-family: var(--font-en); font-weight: 600; font-size: 0.8rem;
  letter-spacing: 0.3em; color: var(--accent); margin-bottom: 22px;
}
.hero-title {
  font-size: clamp(2.6rem, 7vw, 4.6rem); font-weight: 900;
  letter-spacing: -0.03em; line-height: 1.15; margin-bottom: 26px;
}
.hero-sub { color: var(--text-dim); font-size: 1.05rem; margin-bottom: 38px; }
.hero-sub strong { color: var(--text); }
.hero-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-bottom: 60px; }

.btn {
  display: inline-block; padding: 14px 30px; border-radius: 999px;
  font-weight: 700; font-size: 0.95rem; transition: .25s;
}
.btn-primary { background: var(--accent); color: #06130a; }
.btn-primary:hover { background: var(--accent-deep); transform: translateY(-2px); }
.btn-ghost { border: 1px solid var(--line); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.btn-youtube { background: var(--yt); color: #fff; }
.btn-youtube:hover { background: #d90429; transform: translateY(-2px); }

.hero-stats { display: flex; gap: 48px; justify-content: center; flex-wrap: wrap; }
.stat { display: flex; flex-direction: column; align-items: center; }
.stat strong {
  font-family: var(--font-en); font-size: 1.7rem; font-weight: 800;
  color: var(--accent);
}
.stat span { font-size: 0.8rem; color: var(--text-dim); margin-top: 2px; }

.scroll-hint {
  position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%);
  font-family: var(--font-en); font-size: 0.65rem; letter-spacing: 0.3em;
  color: var(--text-dim); animation: bob 2s infinite;
}
@keyframes bob { 0%,100% { transform: translate(-50%, 0); } 50% { transform: translate(-50%, 6px); } }

/* ---------- Sections ---------- */
.section { padding: 110px 0; }
.section-dark { background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-eyebrow {
  font-family: var(--font-en); font-weight: 600; font-size: 0.78rem;
  letter-spacing: 0.3em; color: var(--accent); margin-bottom: 12px;
}
.section-title {
  font-size: clamp(1.7rem, 4vw, 2.4rem); font-weight: 900;
  letter-spacing: -0.02em; margin-bottom: 16px;
}
.section-desc { color: var(--text-dim); margin-bottom: 48px; max-width: 560px; }

/* ---------- About ---------- */
.about-grid {
  display: grid; grid-template-columns: 1.1fr 1fr; gap: 56px; align-items: start;
  margin-top: 32px;
}
.about-text p { margin-bottom: 22px; font-size: 1.02rem; }
.about-text strong { color: var(--accent); }
.about-quote {
  border-left: 3px solid var(--accent); padding: 10px 20px;
  background: var(--panel); border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text); font-weight: 500;
}
.about-cards { display: flex; flex-direction: column; gap: 16px; }
.mini-card {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px 24px; transition: .25s;
}
.mini-card:hover { border-color: var(--accent); transform: translateX(6px); }
.mini-card h3 { font-size: 1rem; margin-bottom: 8px; }
.mini-card p { font-size: 0.88rem; color: var(--text-dim); }

/* ---------- System cards ---------- */
.card-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.card {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 30px 24px;
  position: relative; overflow: hidden; transition: .25s;
}
.card:hover { border-color: var(--accent); transform: translateY(-6px); }
.card-num {
  font-family: var(--font-en); font-weight: 800; font-size: 2.4rem;
  color: var(--accent-dark); display: block; margin-bottom: 14px;
}
.card:hover .card-num { color: var(--accent); }
.card h3 { font-size: 1rem; margin-bottom: 10px; letter-spacing: 0.02em; }
.card p { font-size: 0.87rem; color: var(--text-dim); }

/* ---------- Projects ---------- */
.project-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.project-card {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden; transition: .25s;
}
.project-card:hover { border-color: var(--accent); transform: translateY(-6px); }
.project-thumb {
  height: 150px; display: flex; align-items: center; justify-content: center;
  font-size: 3rem; background: linear-gradient(135deg, var(--bg-soft), var(--accent-dark));
}
.project-body { padding: 24px; }
.badge {
  display: inline-block; font-size: 0.7rem; font-weight: 700;
  padding: 4px 12px; border-radius: 999px; margin-bottom: 12px;
}
.badge-live { background: rgba(74,222,128,.15); color: var(--accent); }
.badge-plan { background: rgba(250,204,21,.15); color: #facc15; }
.badge-seed { background: rgba(148,163,179,.15); color: var(--text-dim); }
.project-body h3 { font-size: 1.1rem; margin-bottom: 10px; }
.project-body p { font-size: 0.88rem; color: var(--text-dim); margin-bottom: 16px; }
.project-meta { font-size: 0.75rem; color: var(--text-dim); border-top: 1px solid var(--line); padding-top: 14px; }

/* ---------- Timeline ---------- */
.timeline { position: relative; padding-left: 28px; max-width: 720px; }
.timeline::before {
  content: ""; position: absolute; left: 6px; top: 6px; bottom: 6px;
  width: 2px; background: linear-gradient(var(--accent), var(--line));
}
.timeline-item { position: relative; padding: 0 0 44px 28px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: ""; position: absolute; left: -28px; top: 8px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--bg-soft); border: 3px solid var(--accent);
}
.timeline-date {
  font-family: var(--font-en); font-weight: 600; font-size: 0.8rem;
  color: var(--accent); letter-spacing: 0.08em; margin-bottom: 6px;
}
.timeline-content h3 { font-size: 1.1rem; margin-bottom: 6px; }
.timeline-content p { font-size: 0.9rem; color: var(--text-dim); }

/* ---------- Reflection ---------- */
.reflection-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.reflection-card {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px; position: relative; transition: .25s;
  display: flex; flex-direction: column; gap: 12px;
}
.reflection-card:hover { border-color: var(--accent); transform: translateY(-6px); }
.reflection-date {
  font-family: var(--font-en); font-size: 0.75rem; font-weight: 600;
  letter-spacing: 0.1em; color: var(--accent);
}
.reflection-card h3 { font-size: 1.05rem; }
.reflection-card p { font-size: 0.9rem; color: var(--text-dim); flex: 1; }
.reflection-tag { font-size: 0.75rem; color: var(--accent); font-weight: 500; }

/* ---------- YouTube ---------- */
.yt-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 44px; }
.yt-placeholder {
  aspect-ratio: 16 / 9; border-radius: var(--radius);
  background: var(--panel); border: 1px dashed var(--line);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 10px; color: var(--text-dim); font-size: 0.85rem; transition: .25s;
}
.yt-placeholder:hover { border-color: var(--yt); }
.yt-play {
  width: 52px; height: 52px; border-radius: 50%;
  background: rgba(255, 0, 51, 0.15); color: var(--yt);
  display: flex; align-items: center; justify-content: center; font-size: 1.1rem;
}
.yt-cta { text-align: center; }
.yt-note { font-size: 0.75rem; color: var(--text-dim); margin-top: 14px; }

/* ---------- Footer ---------- */
.footer { background: var(--bg-soft); border-top: 1px solid var(--line); padding: 64px 0 32px; }
.footer-top {
  display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 40px;
  padding-bottom: 40px; border-bottom: 1px solid var(--line);
}
.footer-brand strong { font-size: 1.2rem; font-weight: 900; margin-left: 8px; }
.footer-brand p { font-size: 0.85rem; color: var(--text-dim); margin-top: 10px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a {
  font-family: var(--font-en); font-size: 0.8rem; font-weight: 600;
  letter-spacing: 0.08em; color: var(--text-dim); transition: color .2s;
}
.footer-links a:hover { color: var(--accent); }
.footer-contact p { font-size: 0.85rem; color: var(--text-dim); margin-bottom: 8px; }
.footer-mail { color: var(--accent); font-weight: 500; }
.footer-bottom { padding-top: 28px; text-align: center; }
.footer-bottom p { font-size: 0.75rem; color: var(--text-dim); }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s, transform .7s; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .project-grid, .reflection-grid, .yt-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
}
@media (max-width: 680px) {
  .nav {
    position: fixed; top: 60px; right: 0; left: 0;
    background: var(--bg-soft); border-bottom: 1px solid var(--line);
    flex-direction: column; padding: 24px; gap: 18px;
    transform: translateY(-130%); transition: transform .3s;
  }
  .nav.open { transform: translateY(0); }
  .nav-toggle { display: block; }
  .card-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 28px; }
  .section { padding: 80px 0; }
}