@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');
:root{
  --bg:#f8fffe;--bg2:#f0faf7;--card:#ffffff;
  --card-border:rgba(16,185,129,0.12);--text:#0f172a;--text2:#475569;
  --primary:#10b981;--primary2:#059669;--primary-light:rgba(16,185,129,0.08);
  --accent:#0ea5e9;--accent2:#0284c7;--accent-light:rgba(14,165,233,0.08);
  --warm:#f59e0b;--warm2:#d97706;
  --red:#ef4444;--green:#10b981;--purple:#8b5cf6;
  --grad1:linear-gradient(135deg,#10b981,#059669);
  --grad2:linear-gradient(135deg,#0ea5e9,#8b5cf6);
  --grad3:linear-gradient(135deg,#f59e0b,#ef4444);
  --grad-hero:linear-gradient(180deg,#f0fdf9 0%,#f8fffe 50%,#ffffff 100%);
  --shadow:0 2px 12px rgba(16,185,129,0.06);
  --shadow-hover:0 8px 32px rgba(16,185,129,0.12);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Inter','Apple SD Gothic Neo','Noto Sans KR',sans-serif;background:var(--bg);color:var(--text);line-height:1.85;overflow-x:hidden;font-size:16px;word-break:keep-all;overflow-wrap:break-word}
::selection{background:var(--primary);color:#fff}
::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:#f1f5f1}
::-webkit-scrollbar-thumb{background:var(--primary);border-radius:3px}

/* NAV */
nav{position:fixed;top:0;left:0;right:0;z-index:100;padding:10px 20px;
  background:rgba(248,255,254,0.95);backdrop-filter:blur(20px);
  border-bottom:1px solid var(--card-border);display:flex;align-items:center;justify-content:space-between;
  box-shadow:0 1px 4px rgba(16,185,129,0.05)}
nav .logo{font-size:1rem;font-weight:700;color:var(--text);display:flex;align-items:center;gap:8px;
  text-decoration:none;flex-shrink:0}
nav .logo img{width:32px;height:32px;border-radius:6px}
nav .logo span{background:var(--grad1);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
nav .nav-links{display:flex;gap:2px;flex-wrap:wrap;align-items:center}
nav .nav-links a{color:var(--text2);text-decoration:none;font-size:.78rem;padding:5px 8px;
  border-radius:6px;transition:.3s;white-space:nowrap}
nav .nav-links a:hover,nav .nav-links a.active{color:var(--primary);background:var(--primary-light)}
.hamburger{display:none;background:none;border:none;cursor:pointer;padding:6px;font-size:1.3rem}

/* HERO */
.hero{min-height:50vh;display:flex;flex-direction:column;align-items:center;justify-content:center;
  text-align:center;padding:120px 24px 60px;position:relative;overflow:hidden;
  background:var(--grad-hero)}
.hero::before{content:'';position:absolute;width:600px;height:600px;
  background:radial-gradient(circle,rgba(16,185,129,0.06),transparent 70%);top:-200px;right:-100px}
.hero::after{content:'';position:absolute;width:400px;height:400px;
  background:radial-gradient(circle,rgba(14,165,233,0.04),transparent 70%);bottom:-100px;left:-100px}
.hero h1{font-size:clamp(1.8rem,4.5vw,3.2rem);font-weight:800;margin-bottom:16px;
  background:linear-gradient(135deg,#0f172a,#10b981);-webkit-background-clip:text;-webkit-text-fill-color:transparent;
  line-height:1.3}
.hero p{font-size:1.1rem;color:var(--text2);max-width:700px;line-height:1.9}

/* PURPOSE BANNER */
.purpose-banner{
  background:linear-gradient(135deg,#f0fdf9,#ecfdf5);
  border:2px solid rgba(16,185,129,0.25);border-radius:16px;padding:32px 36px;
  max-width:900px;margin:0 auto 40px;position:relative;
  box-shadow:0 4px 20px rgba(16,185,129,0.08)}
.purpose-banner::before{
  content:'';position:absolute;top:0;left:0;right:0;height:4px;
  background:linear-gradient(90deg,#10b981,#0ea5e9,#8b5cf6);border-radius:16px 16px 0 0}
.purpose-banner h2{font-size:1.15rem;font-weight:700;color:var(--primary2);margin-bottom:12px}
.purpose-banner p{font-size:.9rem;color:#334155;line-height:2}
.purpose-banner .source-badge{display:inline-flex;align-items:center;gap:6px;
  background:#fff;border:1px solid var(--card-border);border-radius:20px;
  padding:6px 16px;font-size:.82rem;font-weight:600;color:var(--primary);margin-top:12px;
  text-decoration:none;transition:.3s}
.purpose-banner .source-badge:hover{background:var(--primary-light);border-color:var(--primary)}

/* SECTIONS */
section{padding:60px 24px;max-width:1200px;margin:0 auto}
.section-title{font-size:clamp(1.4rem,3vw,2rem);font-weight:700;margin-bottom:8px;
  display:flex;align-items:center;gap:12px;color:var(--text)}
.section-title .icon{width:40px;height:40px;border-radius:12px;display:flex;
  align-items:center;justify-content:center;font-size:1.3rem;flex-shrink:0;color:#fff}
.section-sub{color:var(--text2);margin-bottom:32px;font-size:1rem}

/* CARDS */
.card{background:#ffffff;border:1px solid var(--card-border);border-radius:16px;
  padding:24px;transition:.3s;box-shadow:var(--shadow)}
.card:hover{border-color:rgba(16,185,129,0.3);transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px}
.card h3{font-size:1.1rem;font-weight:600;margin-bottom:8px;color:var(--text)}
.card .tag{display:inline-block;padding:3px 12px;border-radius:20px;font-size:.72rem;
  font-weight:600;margin-bottom:10px}
.card-link{text-decoration:none;color:inherit;display:block}
.card-link .card{cursor:pointer}

/* TOPIC CARD */
.topic-card{position:relative;overflow:hidden}
.topic-card .topic-icon{font-size:2.2rem;margin-bottom:12px}
.topic-card .topic-title{font-size:1.05rem;font-weight:700;margin-bottom:6px;color:var(--text)}
.topic-card .topic-desc{font-size:.85rem;color:var(--text2);line-height:1.7}
.topic-card .topic-arrow{position:absolute;right:16px;bottom:16px;font-size:1.2rem;color:var(--primary);
  opacity:0;transition:.3s;transform:translateX(-8px)}
.topic-card:hover .topic-arrow{opacity:1;transform:translateX(0)}

/* TABLE */
.table-wrap{overflow-x:auto;border-radius:12px;border:1px solid var(--card-border);margin:20px 0;
  box-shadow:var(--shadow);-webkit-overflow-scrolling:touch}
table{width:100%;border-collapse:collapse;font-size:.9rem}
thead{background:rgba(16,185,129,0.06)}
th{padding:12px 14px;text-align:left;font-weight:600;color:var(--primary2);
  border-bottom:2px solid rgba(16,185,129,0.15);white-space:nowrap;font-size:.82rem}
td{padding:10px 14px;border-bottom:1px solid rgba(0,0,0,0.04);color:var(--text)}
tr:hover td{background:rgba(16,185,129,0.03)}

/* EP LINK */
.ep-link{display:inline-flex;align-items:center;gap:4px;
  background:var(--primary-light);color:var(--primary2);
  font-size:.72rem;font-weight:600;padding:2px 10px;border-radius:12px;
  text-decoration:none;transition:.3s;border:1px solid rgba(16,185,129,0.2);
  white-space:nowrap;cursor:pointer}
.ep-link:hover{background:var(--primary);color:#fff;border-color:var(--primary)}
.ep-link::after{content:'↗';font-size:.65rem}

/* DO / NOT DO */
.do-box{background:rgba(16,185,129,0.04);border:1px solid rgba(16,185,129,0.15);
  border-radius:12px;padding:16px 20px;margin:12px 0}
.do-box h4{color:var(--primary2);font-size:.9rem;margin-bottom:8px}
.notdo-box{background:rgba(239,68,68,0.04);border:1px solid rgba(239,68,68,0.15);
  border-radius:12px;padding:16px 20px;margin:12px 0}
.notdo-box h4{color:var(--red);font-size:.9rem;margin-bottom:8px}

/* BLOCKQUOTE */
blockquote{border-left:3px solid var(--primary);padding:12px 20px;margin:16px 0;
  background:rgba(16,185,129,0.03);border-radius:0 8px 8px 0;
  font-style:italic;color:var(--text2);font-size:.9rem}

/* PHASE CARD */
.phase-card{border-left:4px solid var(--primary);padding-left:20px}
.phase-card.phase-2{border-color:var(--accent)}
.phase-card.phase-3{border-color:var(--warm)}
.phase-card.phase-4{border-color:var(--purple)}
.phase-card.phase-5{border-color:var(--red)}
.phase-card.phase-6{border-color:#ec4899}

/* EPISODE DETAIL */
.ep-detail{margin:32px 0;padding:24px;background:#fff;border:1px solid var(--card-border);
  border-radius:16px;box-shadow:var(--shadow)}
.ep-detail h3{font-size:1.05rem;font-weight:700;margin-bottom:12px;color:var(--text);
  display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.ep-detail h4{font-size:.92rem;font-weight:600;margin:16px 0 8px;color:var(--text)}
.ep-detail ul,.ep-detail ol{padding-left:20px;margin:8px 0}
.ep-detail li{margin:4px 0;font-size:.88rem;color:var(--text2);line-height:1.8}

/* OVERVIEW BOX */
.overview-box{background:linear-gradient(135deg,#f0fdf9,#ecfdf5);border:1px solid rgba(16,185,129,0.2);
  border-radius:16px;padding:24px;margin:20px 0}
.overview-box h3{font-size:1rem;font-weight:700;margin-bottom:8px}
.overview-box p{font-size:.88rem;line-height:1.9;color:#334155}

/* CODE */
code{background:var(--bg2);color:var(--primary2);padding:2px 6px;border-radius:4px;font-size:.85rem}
pre{background:var(--bg2);border:1px solid var(--card-border);border-radius:12px;
  padding:16px 20px;overflow-x:auto;font-size:.82rem;line-height:1.7;margin:12px 0}

/* PAGE NAV (prev/next) */
.page-nav{display:flex;gap:16px;margin:40px 0;justify-content:space-between}
.page-nav a{flex:1;display:flex;flex-direction:column;padding:16px 20px;
  background:#fff;border:1px solid var(--card-border);border-radius:12px;
  text-decoration:none;transition:.3s;box-shadow:var(--shadow)}
.page-nav a:hover{border-color:var(--primary);box-shadow:var(--shadow-hover)}
.page-nav a .nav-label{font-size:.75rem;color:var(--text2);margin-bottom:4px}
.page-nav a .nav-title{font-size:.9rem;font-weight:600;color:var(--primary)}
.page-nav a:last-child{text-align:right}

/* FOOTER */
footer{text-align:center;padding:40px 24px;color:var(--text2);font-size:.8rem;
  border-top:1px solid var(--card-border);background:#f0faf7}
footer a{color:var(--primary);text-decoration:none}

/* ANIM */
.fade-in{opacity:0;transform:translateY(24px);transition:opacity .5s,transform .5s}
.fade-in.visible{opacity:1;transform:translateY(0)}

/* MOBILE */
@media(max-width:768px){
  body{font-size:15px}
  nav{padding:8px 12px}
  nav .logo span{font-size:.85rem}
  nav .nav-links{display:none;position:absolute;top:100%;left:0;right:0;
    background:rgba(248,255,254,0.98);backdrop-filter:blur(20px);
    flex-direction:column;padding:12px;gap:4px;border-bottom:1px solid var(--card-border);
    box-shadow:0 4px 12px rgba(0,0,0,0.08)}
  nav .nav-links.open{display:flex}
  nav .nav-links a{padding:10px 16px;font-size:.88rem;width:100%;border-radius:8px}
  .hamburger{display:block}
  .card-grid{grid-template-columns:1fr}
  section{padding:40px 14px}
  .hero{padding:80px 16px 40px}
  .hero h1{font-size:1.6rem}
  .hero p{font-size:.95rem}
  table{font-size:.82rem}
  th{font-size:.78rem;padding:10px 8px}
  td{padding:8px}
  .card{padding:18px}
  .table-wrap{margin:12px -14px;border-radius:0;border-left:none;border-right:none}
  .purpose-banner{margin:0 8px 30px;padding:24px 16px}
  .purpose-banner h2{font-size:1rem}
  .page-nav{flex-direction:column;gap:10px}
  .ep-detail{padding:16px;margin:20px 0}
  .ep-detail h3{font-size:.95rem}
  .overview-box{padding:16px}
}
@media(max-width:480px){
  .card-grid{grid-template-columns:1fr}
  .hero h1{font-size:1.4rem}
}