@font-face{font-family:"Freesentation";src:url("fonts/freesentation.woff2") format("woff2");font-weight:100 900;font-display:swap;}
@font-face{font-family:"NexonWarhaven";src:url("fonts/nexon-warhaven.woff2") format("woff2");font-weight:400;font-display:swap;}

:root{
  /* 색상 (원본 계산값) */
  --bg:#0c0a09;            /* hsl(20 14.3% 4.1%) */
  --fg:#fafaf9;            /* hsl(60 9.1% 97.8%) */
  --fg-80:rgba(250,250,249,.8);
  --fg-50:rgba(250,250,249,.5);
  --fg-10:rgba(250,250,249,.1);
  --border:#292524;        /* hsl(12 6.5% 15.1%) */
  --primary:#f8db72;       /* hsl(47 91% 71%) */
  --primary-90:rgba(248,219,114,.9);
  --primary-60:rgba(248,219,114,.6);
  --primary-fg:#422006;
  --tab-line:#333;
  --price-red:#e51715;
  --cta-red:#ef4444;
  --cta-bg:#121212;
  --cta-border:#262626;

  /* 폰트 */
  --font:"Freesentation","Pretendard Variable","Pretendard",-apple-system,BlinkMacSystemFont,system-ui,"Segoe UI","Apple SD Gothic Neo","Malgun Gothic",sans-serif;
  --font-display:"NexonWarhaven",var(--font);

  /* 치수 */
  --radius:8px;
  --radius-sm:4px;
  --radius-xl:12px;
  --container:1400px;
  --course-max:1200px;
  --side-w:380px;
  --gutter:20px;
  --shadow-btn:0 1px 3px 0 rgba(0,0,0,.1),0 1px 2px -1px rgba(0,0,0,.1);
  --shadow-cta:0 4px 6px -1px rgba(0,0,0,.1),0 2px 4px -2px rgba(0,0,0,.1);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;border:0 solid var(--border);}
html{-webkit-text-size-adjust:100%;}
body{background:var(--bg);color:var(--fg);font-family:var(--font);font-size:16px;line-height:24px;-webkit-font-smoothing:antialiased;}
img,svg,iframe,video{display:block;max-width:100%;}
img{height:auto;}
a{color:inherit;text-decoration:none;}
button,input{font:inherit;color:inherit;background:none;cursor:pointer;}
input{cursor:text;}
ul{list-style:none;}

.page{min-height:100vh;display:flex;flex-direction:column;}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 var(--gutter);}

/* ─── 헤더 ─── */
.site-header{position:sticky;top:0;z-index:20;background:var(--bg);padding:24px 0;border-bottom:1px solid transparent;}
.header-row{display:flex;align-items:center;justify-content:space-between;}
.logo{display:flex;align-items:center;}
.logo img{width:120px;}
.gnb{display:none;}
.gnb ul{display:flex;align-items:center;column-gap:40px;}
.gnb a{white-space:nowrap;color:var(--fg-80);transition:color .15s;}
.gnb a:hover{color:var(--primary);}
.header-right{display:flex;align-items:center;column-gap:40px;}
.search{display:none;position:relative;width:210px;background:var(--fg-10);}
.search input{width:100%;padding:8px 40px 8px 12px;font-size:15px;line-height:22.5px;font-weight:300;border-radius:var(--radius-sm);outline:none;background:transparent;box-shadow:0 0 0 1px transparent;transition:box-shadow .15s;}
.search input::placeholder{color:var(--fg-50);font-size:14px;}
.search input:hover{box-shadow:0 0 0 1px var(--primary-60);}
.search input:focus{box-shadow:0 0 0 1px var(--fg-50);}
.search button{position:absolute;right:16px;top:11px;color:var(--fg-80);}
.search button svg{width:16px;height:16px;}
.login{display:flex;align-items:center;column-gap:8px;transition:color .15s;}
.login:hover{color:var(--primary);}
.login svg{width:24px;height:24px;flex-shrink:0;}

/* ─── 레이아웃 ─── */
.course-wrap{flex-grow:1;display:flex;flex-direction:column;}
.layout{max-width:var(--course-max);width:100%;margin:0 auto;display:flex;flex-direction:column;}
.col-main{display:flex;flex-direction:column;width:100%;padding:0 var(--gutter);min-width:0;order:3;}
.col-side{width:100%;display:flex;flex-direction:column;flex-shrink:0;min-width:0;order:2;}
.video-mo-wrap{order:1;}
.video{position:relative;aspect-ratio:16/9;border-radius:var(--radius);overflow:hidden;}
.video iframe,.video video{position:absolute;inset:0;width:100%;height:100%;border:0;}
.video video{object-fit:contain;background:#000;}
.video-pc{display:none;}

/* ─── 탭 ─── */
.course-tabs{position:sticky;top:72px;z-index:10;}
.course-tabs-inner{padding:4px 0;display:flex;align-items:center;background:var(--bg);}
.course-tabs a{flex:1;min-width:0;}
.course-tabs a div{color:var(--fg-50);font-size:14px;line-height:20px;padding:8px;display:flex;align-items:center;justify-content:center;white-space:nowrap;box-shadow:inset 0 -1px 0 var(--tab-line);transition:all .15s;}
.course-tabs a div:hover{color:var(--primary);font-weight:600;box-shadow:inset 0 -2px 0 var(--primary);}

/* ─── 섹션 ─── */
.sec{padding:40px 0;min-width:0;}
.sec h2{font-size:20px;line-height:28px;font-weight:600;padding-bottom:20px;}
.detail-images{position:relative;}
.detail-images img{width:100%;}
.muted-text{color:var(--fg-50);line-height:1.75;}
.pre{white-space:pre-line;}
.rich p{min-height:24px;}

/* 강사 */
.teacher{border-bottom:1px solid var(--border);}
.teacher-head{display:flex;flex:1;width:100%;align-items:center;justify-content:space-between;padding:16px 0;font-size:14px;font-weight:500;text-align:left;transition:all .15s;}
.teacher-head:hover{text-decoration:underline;}
.teacher-head{justify-content:flex-start;column-gap:12px;}
.avatar{position:relative;display:flex;width:40px;height:40px;flex-shrink:0;overflow:hidden;border-radius:9999px;}
.avatar img{width:100%;height:100%;aspect-ratio:1/1;object-fit:cover;}
.teacher-name{font-size:16px;line-height:24px;font-weight:600;}
.teacher-body{font-size:14px;line-height:20px;padding-bottom:16px;}
.teacher-body ul{list-style:disc;padding-left:20px;}

/* ─── 사이드 카드 ─── */
.side-card{display:flex;flex-direction:column;gap:12px;padding:20px;}
.side-card{row-gap:28px;}
.side-info{display:flex;flex-direction:column;gap:8px;}
.badges{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:8px;}
.badge{font-size:12px;font-weight:700;padding:4px 8px;border-radius:var(--radius-sm);line-height:1.25;}
.side-card h1{font-size:20px;line-height:28px;font-weight:700;}
.side-teacher{color:var(--fg-50);font-weight:500;}
.side-thumb{position:relative;aspect-ratio:16/9;width:100%;overflow:hidden;border-radius:var(--radius);margin-top:8px;}
.side-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;}
.divider{flex-shrink:0;background:var(--border);height:1px;width:100%;}
.side-buy{display:flex;flex-direction:column;gap:20px;}
.price-row{display:flex;align-items:center;justify-content:space-between;column-gap:16px;flex-wrap:wrap;}
.price-label{color:var(--price-red);font-weight:600;font-size:22px;line-height:33px;}
.price{margin-left:auto;font-size:22px;line-height:33px;font-weight:700;}

.btn-primary{display:inline-flex;align-items:center;justify-content:center;gap:8px;white-space:nowrap;border-radius:var(--radius);background:var(--primary);color:var(--primary-fg);box-shadow:var(--shadow-btn);font-weight:600;font-size:16px;line-height:24px;padding:14px;width:100%;transition:background-color .15s;}
.btn-primary:hover{background:var(--primary-90);}

/* ─── 하단 고정 바 ─── */
.mobile-cta{position:fixed;bottom:0;left:0;width:100%;padding:12px;z-index:20;}
.mobile-cta-inner{max-width:900px;margin:0 auto;width:100%;background:var(--cta-bg);box-shadow:var(--shadow-cta);display:flex;align-items:center;justify-content:space-between;border-radius:var(--radius-xl);}
.mobile-cta-price{display:none;align-items:flex-end;column-gap:20px;}
.mobile-cta-price .label{color:var(--cta-red);font-weight:600;font-size:18px;line-height:28px;}
.mobile-cta-price .value{color:#fff;font-weight:600;font-size:18px;line-height:1.25;}
.mobile-cta-btn{width:100%;}

/* ─── 푸터 ─── */
.site-footer{margin-top:auto;position:relative;z-index:10;padding:40px 0;background:var(--bg);color:var(--fg);}
.footer-inner > * + *{margin-top:40px;}
.footer-logo{display:flex;align-items:center;}
.footer-logo img{width:140px;}
.footer-row{display:flex;flex-direction:column;justify-content:space-between;gap:20px;}
.footer-help{display:flex;flex-direction:column;align-items:flex-start;row-gap:32px;}
.help-title{font-family:var(--font-display);font-size:24px;line-height:32px;}
.ask-btn{padding:4px 4px 4px 24px;border-radius:9999px;background:var(--fg);display:flex;align-items:center;column-gap:24px;transition:opacity .15s;}
.ask-btn:hover{opacity:.8;}
.ask-btn span{font-weight:600;color:var(--bg);white-space:nowrap;}
.ask-icon{background:var(--bg);color:var(--fg);border-radius:9999px;width:32px;height:32px;display:flex;align-items:center;justify-content:center;margin-left:auto;}
.ask-icon svg{width:12px;height:12px;margin-left:2px;}
.footer-right{display:flex;flex-direction:column;align-items:flex-end;row-gap:40px;}
.footer-links{display:flex;gap:16px;align-items:center;flex-wrap:wrap;max-width:300px;justify-content:flex-end;}
.footer-links a{transition:color .15s;}
.footer-links a:hover{color:var(--primary);text-decoration:underline;}
.company{text-align:right;}
.company > * + *{margin-top:8px;}
.company-name{color:var(--fg-80);font-weight:500;}
.company-info{font-size:14px;line-height:20px;color:var(--fg-50);white-space:pre-line;text-align:right;}
.footer-bottom{display:flex;justify-content:space-between;}
.copyright{color:var(--fg-50);}
.social{display:flex;align-items:center;column-gap:24px;}
.social img{width:24px;height:24px;}

/* ─── 768px 이상 ─── */
@media (min-width:768px){
  .logo img{width:172px;}
  .course-tabs{top:87px;}
  .side-sticky{position:sticky;top:150px;}
  .teacher-name{font-size:18px;line-height:28px;}
  .mobile-cta-inner{padding:10px 10px 10px 30px;border:1px solid var(--cta-border);}
  .mobile-cta-price{display:flex;}
  .mobile-cta-btn{width:300px;}
  .site-footer{padding:80px 0;}
  .footer-inner > * + *{margin-top:80px;}
  .footer-row{flex-direction:row;}
  .help-title{font-size:36px;line-height:40px;}
  .ask-btn{padding:6px 6px 6px 28px;}
  .ask-btn span{font-size:18px;line-height:28px;}
  .ask-icon{width:40px;height:40px;}
  .ask-icon svg{width:16px;height:16px;}
  .gnb{font-size:20px;line-height:28px;}
}

/* ─── 1024px 이상 (PC) ─── */
@media (min-width:1024px){
  .gnb{display:block;}
  .search{display:block;}
  .layout{flex-direction:row;column-gap:40px;padding:0 var(--gutter);}
  .col-main{padding:0;order:0;flex:1 1 0%;}
  .col-side{width:var(--side-w);order:0;padding-bottom:20px;}
  .side-card{padding:0;}
  .video-pc{display:block;}
  .video-mo-wrap{display:none;}
  .course-tabs a div{font-size:16px;line-height:24px;padding:12px;}
  .sec h2{font-size:24px;line-height:32px;}
  .side-card h1{font-size:24px;line-height:32px;}
  .mobile-cta{display:none;}
  .help-title{font-size:48px;line-height:48px;}
  .ask-btn{padding:6px 6px 6px 32px;}
  .ask-btn span{font-size:20px;line-height:28px;}
  .ask-icon{width:56px;height:56px;}
}