*{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#0a0c10;--bg2:#0f1218;--bg3:#161b24;
  --accent:#00e5ff;--accent2:#7c3aed;--accent3:#f97316;
  --text:#e2e8f0;--text2:#94a3b8;--border:#1e293b;
}
body{background:var(--bg);color:var(--text);font-family:'Noto Sans Thai',sans-serif;min-height:100vh;overflow-x:hidden}

/* NAV */
.topbar{
  display:flex;align-items:center;justify-content:space-between;
  padding:12px clamp(14px,4vw,28px);
  border-bottom:1px solid var(--border);
  background:rgba(10,12,16,.9);
  backdrop-filter:blur(10px);
  position:sticky;top:0;z-index:100;
}
.topbar-logo{font-family:'Rajdhani',sans-serif;font-size:18px;font-weight:700;color:var(--text);text-decoration:none;letter-spacing:1px}
.topbar-logo span{color:var(--accent)}
.back-btn{
  display:flex;align-items:center;gap:6px;
  font-family:'Rajdhani',sans-serif;font-size:12px;letter-spacing:2px;text-transform:uppercase;
  color:var(--text2);text-decoration:none;
  border:1px solid var(--border);background:var(--bg3);
  padding:6px 14px;border-radius:8px;
  transition:all .2s;
}
.back-btn:hover{color:var(--accent);border-color:rgba(0,229,255,.3)}

/* HERO */
.page-hero{
  position:relative;padding:clamp(28px,5vw,48px) clamp(14px,5vw,40px) clamp(24px,4vw,36px);
  overflow:hidden;
}
.page-hero::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse 50% 80% at 20% 50%,rgba(249,115,22,.06) 0%,transparent 60%),radial-gradient(ellipse 40% 60% at 80% 30%,rgba(0,229,255,.05) 0%,transparent 60%);pointer-events:none}
.grid-lines{position:absolute;inset:0;background-image:linear-gradient(rgba(0,229,255,.025) 1px,transparent 1px),linear-gradient(90deg,rgba(0,229,255,.025) 1px,transparent 1px);background-size:40px 40px;pointer-events:none}
.page-tag{display:inline-flex;align-items:center;gap:6px;border:1px solid rgba(249,115,22,.3);background:rgba(249,115,22,.06);color:#fb923c;padding:3px 12px;border-radius:100px;font-family:'Rajdhani',sans-serif;font-size:11px;letter-spacing:2px;text-transform:uppercase;margin-bottom:14px;position:relative;z-index:1}
.page-title{font-family:'Rajdhani',sans-serif;font-size:clamp(28px,7vw,56px);font-weight:700;line-height:1.1;position:relative;z-index:1;margin-bottom:8px}
.page-title span{background:linear-gradient(135deg,#fff 30%,#fb923c);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.page-desc{font-size:clamp(12px,2.5vw,14px);color:var(--text2);max-width:520px;line-height:1.7;position:relative;z-index:1}

/* PROGRESS BAR */
.progress-wrap{
  background:var(--bg2);border-bottom:1px solid var(--border);
  padding:10px clamp(14px,4vw,28px);
  display:flex;align-items:center;gap:12px;
}
.progress-label{font-family:'Rajdhani',sans-serif;font-size:11px;letter-spacing:2px;text-transform:uppercase;color:var(--text2);white-space:nowrap}
.progress-bar-outer{flex:1;height:4px;background:var(--border);border-radius:4px;overflow:hidden}
.progress-bar-inner{height:100%;background:linear-gradient(90deg,#fb923c,var(--accent));border-radius:4px;width:0%;transition:width 1s ease}
.progress-pct{font-family:'Rajdhani',sans-serif;font-size:13px;font-weight:700;color:var(--accent);white-space:nowrap;min-width:34px;text-align:right}

/* CONTENT */
.content{padding:clamp(16px,4vw,32px) clamp(14px,4vw,28px);max-width:800px;margin:0 auto}

.phase{margin-bottom:clamp(28px,5vw,40px)}
.phase-header{
  display:flex;align-items:center;gap:12px;margin-bottom:16px;
}
.phase-num{
  width:32px;height:32px;border-radius:8px;
  background:rgba(249,115,22,.12);border:1px solid rgba(249,115,22,.3);
  display:flex;align-items:center;justify-content:center;
  font-family:'Rajdhani',sans-serif;font-size:14px;font-weight:700;color:#fb923c;
  flex-shrink:0;
}
.phase-num.cyan{background:rgba(0,229,255,.08);border-color:rgba(0,229,255,.25);color:var(--accent)}
.phase-num.purple{background:rgba(124,58,237,.12);border-color:rgba(124,58,237,.3);color:#a78bfa}
.phase-title{font-family:'Rajdhani',sans-serif;font-size:clamp(16px,3.5vw,20px);font-weight:600;color:var(--text)}
.phase-sub{font-size:12px;color:var(--text2)}

/* STEP CARD */
.step-list{display:flex;flex-direction:column;gap:8px}
.step{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:12px;padding:12px 14px;
  display:flex;align-items:flex-start;gap:12px;
  transition:border-color .2s;
}
.step:hover{border-color:rgba(0,229,255,.2)}
.step-idx{
  width:24px;height:24px;border-radius:6px;
  background:var(--bg3);border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;
  font-family:'Rajdhani',sans-serif;font-size:12px;font-weight:700;color:var(--text2);
  flex-shrink:0;margin-top:1px;
}
.step-body{flex:1}
.step-text{font-size:clamp(13px,2.5vw,14px);color:var(--text);line-height:1.6}
.step-note{font-size:12px;color:var(--text2);margin-top:4px;line-height:1.5}

/* LINK SKILLS TABLE */
.skills-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(min(100%,230px),1fr));
  gap:10px;margin-top:4px;
}
.skill-card{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:12px;padding:12px 14px;
}
.skill-type{
  font-family:'Rajdhani',sans-serif;font-size:11px;letter-spacing:1.5px;text-transform:uppercase;
  margin-bottom:6px;padding:2px 8px;border-radius:5px;display:inline-block;
}
.type-phy{background:rgba(249,115,22,.1);color:#fb923c;border:1px solid rgba(249,115,22,.2)}
.type-mag{background:rgba(124,58,237,.1);color:#a78bfa;border:1px solid rgba(124,58,237,.2)}
.type-both{background:rgba(0,229,255,.07);color:var(--accent);border:1px solid rgba(0,229,255,.2)}
.skill-stat{font-size:clamp(12px,2.5vw,13px);font-weight:500;color:var(--text);margin-bottom:4px}
.skill-chars{font-size:12px;color:var(--text2);line-height:1.6}

/* MILESTONE */
.milestone-list{display:flex;flex-direction:column;gap:0}
.milestone{
  display:flex;gap:14px;align-items:flex-start;
  padding:14px 0;border-bottom:1px solid var(--border);
}
.milestone:last-child{border-bottom:none}
.milestone-dot-wrap{display:flex;flex-direction:column;align-items:center;gap:0;padding-top:4px}
.milestone-dot{width:12px;height:12px;border-radius:50%;background:var(--accent);border:2px solid var(--bg);flex-shrink:0}
.milestone-dot.purple{background:#a78bfa}
.milestone-dot.orange{background:#fb923c}
.milestone-line{width:1px;flex:1;background:var(--border);min-height:20px;margin-top:4px}
.milestone:last-child .milestone-line{display:none}
.milestone-content{flex:1}
.milestone-level{font-family:'Rajdhani',sans-serif;font-size:clamp(14px,3vw,16px);font-weight:700;color:var(--text);margin-bottom:2px}
.milestone-desc{font-size:clamp(12px,2.5vw,13px);color:var(--text2);line-height:1.6}
.milestone-badge{
  display:inline-block;font-size:10px;
  padding:1px 7px;border-radius:4px;margin-top:4px;
  font-family:'Rajdhani',sans-serif;letter-spacing:1px;text-transform:uppercase;
}
.badge-req{background:rgba(249,115,22,.1);color:#fb923c;border:1px solid rgba(249,115,22,.2)}
.badge-opt{background:rgba(0,229,255,.07);color:var(--accent);border:1px solid rgba(0,229,255,.15)}

.section-divider{height:1px;background:var(--border);margin:0 0 clamp(24px,4vw,36px)}

/* CTA */
.cta-wrap{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:14px;padding:clamp(16px,4vw,24px);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;
  margin-bottom:clamp(28px,5vw,40px);
}
.cta-text h3{font-family:'Rajdhani',sans-serif;font-size:clamp(16px,3vw,18px);font-weight:600;color:var(--text);margin-bottom:4px}
.cta-text p{font-size:12px;color:var(--text2)}
.cta-btn{
  display:inline-flex;align-items:center;gap:8px;
  background:rgba(0,229,255,.08);border:1px solid rgba(0,229,255,.25);
  color:var(--accent);
  padding:9px 18px;border-radius:10px;
  font-family:'Rajdhani',sans-serif;font-size:13px;letter-spacing:1.5px;text-transform:uppercase;
  text-decoration:none;transition:all .2s;white-space:nowrap;
}
.cta-btn:hover{background:rgba(0,229,255,.14);transform:translateY(-1px)}
.cta-btn.orange{background:rgba(249,115,22,.08);border-color:rgba(249,115,22,.25);color:#fb923c}
.cta-btn.orange:hover{background:rgba(249,115,22,.14)}

.footer{padding:clamp(16px,3vw,24px) 20px;text-align:center;border-top:1px solid var(--border);font-size:12px;color:var(--text2)}
.footer span{color:var(--accent)}


/* VIDEO SECTION ด้านล่าง */
.video-section{border-top:1px solid var(--border);padding:clamp(28px,5vw,48px) clamp(14px,4vw,28px)}
.video-section-inner{max-width:800px;margin:0 auto}
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,340px),1fr));gap:16px;margin-top:4px}
.video-item{background:var(--bg2);border:1px solid var(--border);border-radius:14px;overflow:hidden;transition:border-color .25s,transform .25s}
.video-item:hover{border-color:rgba(124,58,237,.4);transform:translateY(-3px)}
.video-thumb{position:relative;padding-bottom:56.25%;background:var(--bg3)}
.video-thumb iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:none}
.video-info{padding:12px 14px}
.video-ep{font-family:'Rajdhani',sans-serif;font-size:10px;letter-spacing:1.5px;text-transform:uppercase;color:var(--text2);margin-bottom:4px}
.video-vtitle{font-size:clamp(13px,2.5vw,14px);font-weight:500;color:var(--text);line-height:1.4}
.video-vtag{display:inline-block;margin-top:6px;font-size:10px;padding:2px 7px;border-radius:4px;font-family:'Rajdhani',sans-serif;letter-spacing:1px;text-transform:uppercase}
.vtag-purple{background:rgba(124,58,237,.1);color:#a78bfa;border:1px solid rgba(124,58,237,.2)}
.vtag-orange{background:rgba(249,115,22,.1);color:#fb923c;border:1px solid rgba(249,115,22,.2)}
.vtag-cyan{background:rgba(0,229,255,.07);color:var(--accent);border:1px solid rgba(0,229,255,.15)}
.vtag-gold{background:rgba(251,191,36,.1);color:#fbbf24;border:1px solid rgba(251,191,36,.2)}