:root{
  --ink:#17324d;
  --ink-2:#294b66;
  --red:#ef4a46;
  --paper:#fbf6ed;
  --paper-2:#f2eadc;
  --blue:#e5f1f6;
  --blue-line:#a9cbd9;
  --line:#d9cdbb;
  --white:#fffdfa;
  --muted:#6f7b83;
  --shadow:0 16px 40px rgba(40,52,61,.10);
  --radius:24px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans KR","Apple SD Gothic Neo","Malgun Gothic",Arial,sans-serif;color:var(--ink);background:var(--paper);line-height:1.65}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
button,input{font:inherit}
.wrap{width:min(1180px,calc(100% - 40px));margin:0 auto}
.site-header{position:sticky;top:0;z-index:40;background:rgba(251,246,237,.94);backdrop-filter:blur(12px);border-bottom:1px solid rgba(217,205,187,.75)}
.nav{height:76px;display:flex;align-items:center;gap:28px}
.brand{display:flex;align-items:center;gap:12px;font-weight:850;letter-spacing:-.04em;white-space:nowrap}.brand-mark{width:36px;height:36px;border-radius:12px;background:linear-gradient(135deg,var(--red),#ff7b63);display:grid;place-items:center;color:white;font-size:14px;box-shadow:0 8px 20px rgba(239,74,70,.22)}
.nav-links{margin-left:auto;display:flex;gap:26px;font-weight:700;font-size:14px}.nav-links a{padding:8px 0;border-bottom:2px solid transparent}.nav-links a:hover{border-color:var(--red)}
.mobile-btn{display:none;margin-left:auto;border:0;background:transparent;font-size:25px;color:var(--ink)}
.eyebrow,.kicker{font-size:13px;font-weight:850;letter-spacing:.08em;color:var(--red);text-transform:uppercase;margin:0 0 12px}.kicker:before{content:"";display:inline-block;width:28px;height:3px;border-radius:3px;background:var(--red);margin-right:10px;vertical-align:middle}
.hero{padding:82px 0 72px;border-bottom:1px solid var(--line);background:radial-gradient(circle at 78% 25%,rgba(213,232,240,.68),transparent 28%),linear-gradient(180deg,#fffaf2,var(--paper))}.hero-grid{display:grid;grid-template-columns:1.06fr .94fr;align-items:center;gap:64px}.hero h1{font-size:clamp(42px,5.6vw,76px);line-height:1.12;letter-spacing:-.06em;margin:0 0 24px}.hero h1 em{font-style:normal;color:var(--red)}.hero p.lead{font-size:19px;color:var(--ink-2);max-width:690px;margin:0 0 30px}.actions{display:flex;gap:12px;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:13px 19px;border-radius:999px;border:1px solid var(--ink);font-weight:800;font-size:14px}.btn.primary{background:var(--ink);color:white}.btn.secondary{background:transparent}.btn.disabled{opacity:.45;cursor:not-allowed}.btn:hover:not(.disabled){transform:translateY(-1px)}
.bridge{min-height:360px;display:flex;align-items:center;justify-content:center;position:relative}.bridge:before{content:"";position:absolute;width:270px;height:270px;border:1px solid var(--blue-line);border-radius:50%;opacity:.9}.bridge-core{width:190px;height:190px;border-radius:50%;background:var(--white);box-shadow:var(--shadow);display:grid;place-items:center;text-align:center;font-weight:900;position:relative;z-index:2}.bridge-core b{display:block;color:var(--red);font-size:20px}.bridge-label{position:absolute;font-weight:850;background:var(--white);border:1px solid var(--line);padding:10px 16px;border-radius:999px;box-shadow:0 8px 26px rgba(40,52,61,.08)}.bridge-label.left{left:0;top:48%}.bridge-label.right{right:0;top:48%}
.section{padding:78px 0}.section-head{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:34px}.section-head h2,.section h2{font-size:clamp(30px,4vw,48px);letter-spacing:-.045em;line-height:1.2;margin:0}.section-head p{max-width:620px;color:var(--ink-2);margin:0}.about-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:70px}.about-copy{font-size:18px;color:var(--ink-2)}
.series-zone{background:#f5eddf;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.series-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.book-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:0 10px 28px rgba(48,55,60,.06);display:flex;flex-direction:column}.cover-box{aspect-ratio:4/5;background:linear-gradient(145deg,#f8f0e3,#e8f2f6);padding:26px;display:flex;align-items:center;justify-content:center;border-bottom:1px solid var(--line)}.cover-box img{height:100%;width:auto;object-fit:contain;filter:drop-shadow(0 12px 18px rgba(0,0,0,.15))}.placeholder{width:76%;height:86%;border-radius:8px;border:1px solid rgba(23,50,77,.2);background:linear-gradient(160deg,#fffaf1,#dfeef4);padding:26px;display:flex;flex-direction:column;justify-content:space-between;text-align:left;box-shadow:0 18px 30px rgba(0,0,0,.08)}.placeholder span{font-weight:900;color:var(--red);font-size:13px}.placeholder strong{font-size:24px;line-height:1.35;letter-spacing:-.04em}.placeholder small{font-weight:750;color:var(--muted)}.book-body{padding:24px;display:flex;flex-direction:column;flex:1}.meta{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:12px;font-weight:850;margin-bottom:12px}.meta .series{color:var(--red)}.meta .status{background:var(--blue);padding:5px 9px;border-radius:999px;color:var(--ink-2)}.book-body h3{font-size:24px;letter-spacing:-.04em;line-height:1.35;margin:0 0 12px}.book-card:first-child .book-body h3{font-size:22px;letter-spacing:-.075em;white-space:nowrap}.book-body p{color:var(--ink-2);margin:0 0 16px}.book-body ul{margin:0 0 18px;padding-left:19px;color:var(--ink-2);font-size:14px}.text-link{margin-top:auto;font-weight:850;color:var(--red)}
.resource-zone{display:grid;grid-template-columns:.9fr 1.1fr;gap:48px;align-items:center}.resource-cards{display:grid;gap:12px}.resource-card{display:grid;grid-template-columns:54px 1fr;gap:16px;align-items:center;background:var(--white);border:1px solid var(--line);border-radius:18px;padding:18px 20px}.resource-card span{width:44px;height:44px;border-radius:50%;background:var(--ink);color:white;display:grid;place-items:center;font-size:12px;font-weight:900}.resource-card:nth-child(2) span{background:var(--red)}.resource-card strong{display:block;font-size:18px}.resource-card p{margin:2px 0 0;color:var(--muted);font-size:14px}
.sales-note{background:var(--ink);color:white}.sales-note .split{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}.sales-note p{color:#d9e3ea}.sales-note .kicker{color:#ff8c7f}.sales-note .kicker:before{background:#ff8c7f}
.contact{display:grid;grid-template-columns:1fr 1fr;gap:50px}.contact dl{margin:0;display:grid;gap:14px}.contact dl div{display:grid;grid-template-columns:110px 1fr;border-bottom:1px solid var(--line);padding:12px 0}.contact dt{font-weight:850}.contact dd{margin:0;color:var(--ink-2)}
.footer{padding:28px 0;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}.footer-row{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
.page-hero{padding:64px 0 44px;background:linear-gradient(180deg,#fffaf2,var(--paper));border-bottom:1px solid var(--line)}.page-hero h1{font-size:clamp(36px,5vw,62px);line-height:1.16;letter-spacing:-.055em;margin:0 0 16px}.page-hero p{font-size:18px;color:var(--ink-2);max-width:800px}.crumb{font-size:13px;color:var(--muted);margin-bottom:20px}.crumb a{font-weight:800}.book-detail{display:grid;grid-template-columns:340px 1fr;gap:56px;align-items:start}.detail-cover{background:var(--white);border:1px solid var(--line);border-radius:22px;padding:28px;box-shadow:var(--shadow);position:sticky;top:100px}.detail-cover img{width:100%;height:auto}.detail-main h2{font-size:34px}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:28px 0}.stat{background:var(--white);border:1px solid var(--line);border-radius:18px;padding:20px;text-align:center}.stat b{display:block;font-size:28px}.stat small{color:var(--muted)}.features{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.feature{background:var(--white);border:1px solid var(--line);border-radius:18px;padding:20px}.feature span{font-size:12px;font-weight:900;color:var(--red)}.feature strong{display:block;margin:8px 0 5px}.feature p{font-size:14px;color:var(--ink-2);margin:0}
.info-table{border-top:2px solid var(--ink);margin-top:28px}.info-row{display:grid;grid-template-columns:140px 1fr;border-bottom:1px solid var(--line);padding:13px 0}.info-row b{font-size:14px}.info-row span{color:var(--ink-2)}
.auth-panel{background:linear-gradient(135deg,#eaf4f7,#fffaf2);border:1px solid var(--blue-line);border-radius:24px;padding:28px;margin-top:28px}.auth-panel h3{margin:0 0 8px;font-size:24px}.auth-panel p{margin:0 0 18px;color:var(--ink-2)}.auth-row{display:flex;gap:10px}.auth-row input{flex:1;min-width:0;border:1px solid var(--line);background:white;border-radius:12px;padding:13px 14px;color:var(--ink)}.auth-row button{border:0;background:var(--ink);color:white;border-radius:12px;padding:0 18px;font-weight:850}.auth-message{display:none;margin-top:14px;padding:12px 14px;border-radius:12px;background:rgba(255,255,255,.85);color:var(--ink-2);font-size:14px}.auth-message.show{display:block}
.download-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:20px}.download-card{border:1px solid var(--line);background:var(--white);border-radius:18px;padding:22px}.download-card .tag{font-size:12px;font-weight:900;color:var(--red)}.download-card h4{font-size:20px;margin:8px 0 6px}.download-card p{font-size:14px;color:var(--muted);margin:0 0 14px}.download-card .pending{display:inline-block;font-size:12px;font-weight:850;background:var(--paper-2);border-radius:999px;padding:6px 10px}
.notice{margin-top:20px;padding:18px 20px;border-left:4px solid var(--red);background:rgba(255,255,255,.55);color:var(--ink-2)}
.status-panel{background:var(--white);border:1px solid var(--line);border-radius:24px;padding:30px}.status-panel h2{font-size:32px;margin-bottom:14px}.status-panel p{color:var(--ink-2)}
.resource-index{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.resource-index article{background:var(--white);border:1px solid var(--line);border-radius:20px;padding:24px}.resource-index h3{margin:8px 0}.resource-index .ready{color:var(--red);font-weight:850;font-size:13px}.resource-index .soon{color:var(--muted);font-weight:850;font-size:13px}
@media(max-width:900px){.book-card:first-child .book-body h3{font-size:24px;letter-spacing:-.04em;white-space:normal}.hero-grid,.about-grid,.resource-zone,.sales-note .split,.contact,.book-detail{grid-template-columns:1fr}.bridge{min-height:290px}.series-grid,.features,.resource-index{grid-template-columns:1fr}.book-card{display:grid;grid-template-columns:190px 1fr}.cover-box{aspect-ratio:auto;min-height:300px}.detail-cover{position:relative;top:auto;max-width:390px}.nav-links{display:none;position:absolute;top:76px;left:0;right:0;padding:18px 24px;background:var(--paper);border-bottom:1px solid var(--line);flex-direction:column}.nav-links.open{display:flex}.mobile-btn{display:block}.section{padding:58px 0}}
@media(max-width:620px){.wrap{width:min(100% - 28px,1180px)}.hero{padding:56px 0}.hero h1{font-size:43px}.hero-grid{gap:34px}.bridge{display:none}.book-card{display:block}.cover-box{min-height:330px}.section-head{display:block}.section-head p{margin-top:12px}.stats,.features,.download-grid{grid-template-columns:1fr}.auth-row{flex-direction:column}.auth-row button{padding:13px}.contact dl div{grid-template-columns:90px 1fr}.page-hero{padding:46px 0 32px}.book-detail{gap:32px}}