/* ===== Dev Diaries WD — Tutorial Theme ===== */
:root{
  --navy-0:#0A1526;
  --navy-1:#0E1E38;
  --navy-2:#122A50;
  --panel:#0C1B33;
  --panel-2:#0f2140;
  --line:rgba(120,160,220,.16);
  --text:#E6EDF3;
  --muted:#9DB0C9;
  --cyan:#22D3EE;
  --blue:#3B82F6;
  --purple:#8B5CF6;
  --green:#3FE08A;
  --red:#FF6B6B;
  --amber:#F2B04E;
  --radius:16px;
  --shadow:0 18px 50px rgba(0,0,0,.45);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  color:var(--text);
  background:
    radial-gradient(1200px 700px at 50% -10%, #1B3A6B 0%, transparent 60%),
    linear-gradient(180deg,#0C1A31 0%, var(--navy-0) 100%);
  background-attachment:fixed;
  min-height:100vh;
  line-height:1.6;
}
a{color:var(--cyan);text-decoration:none}

/* ---- Top bar ---- */
.topbar{
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 28px;
  border-bottom:1px solid var(--line);
  background:rgba(10,21,38,.65);
  backdrop-filter:blur(8px);
  position:sticky;top:0;z-index:20;
}
.brand{display:flex;align-items:center;gap:12px;color:var(--text)}
.brand img{width:44px;height:44px;border-radius:50%;box-shadow:0 0 0 2px rgba(34,211,238,.35)}
.brand-name{font-weight:700;font-size:20px;letter-spacing:.3px}
.brand-name b{color:var(--cyan)}
.badge-series{
  display:inline-flex;align-items:center;gap:10px;
  font-family:'JetBrains Mono',monospace;font-weight:700;font-size:13px;letter-spacing:1px;
  padding:8px 14px;border-radius:999px;
  background:linear-gradient(90deg,rgba(139,92,246,.25),rgba(34,211,238,.20));
  border:1px solid var(--line);color:#DCE7F5;
}
.badge-series .ep{color:var(--cyan)}

/* ---- Hero ---- */
.hero{padding:40px 28px 8px;text-align:center}
.hero-kicker{
  font-family:'JetBrains Mono',monospace;font-size:13px;letter-spacing:3px;
  color:var(--cyan);text-transform:uppercase;
}
.hero h1{
  font-size:clamp(28px,4vw,46px);font-weight:800;margin:10px 0 6px;line-height:1.15;
}
.hero .op{font-family:'JetBrains Mono',monospace;font-weight:800;padding:0 4px}
.op.amber{color:var(--amber)}
.op.cyan{color:var(--cyan)}
.hero-sub{color:var(--muted);font-size:18px;margin:0}

/* ---- Split grid ---- */
.grid{
  display:grid;grid-template-columns:1.05fr .95fr;gap:24px;
  max-width:1200px;margin:26px auto 10px;padding:0 28px;
  align-items:start;
}
.col{display:flex;flex-direction:column;gap:20px;min-width:0}

/* ---- Panels ---- */
.panel{
  background:linear-gradient(180deg,var(--panel-2),var(--panel));
  border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);overflow:hidden;
}
.panel-head{
  display:flex;align-items:center;gap:8px;
  padding:12px 16px;border-bottom:1px solid var(--line);
  font-family:'JetBrains Mono',monospace;font-size:13px;color:var(--muted);
}
.dot{width:12px;height:12px;border-radius:50%;display:inline-block}
.dot.r{background:#FF5F56}.dot.y{background:#FFBD2E}.dot.g{background:#27C93F}
.ph-title{margin-left:8px}
.out-head{color:#BFE9C9}
.run-dot{width:10px;height:10px;border-radius:50%;background:var(--green);
  box-shadow:0 0 10px var(--green);display:inline-block;margin-right:4px}

/* code */
pre.code{margin:0;padding:20px !important;background:transparent !important;
  font-family:'JetBrains Mono',monospace;font-size:14.5px;line-height:1.7;overflow-x:auto}
pre.code code{font-family:'JetBrains Mono',monospace !important;background:transparent !important;text-shadow:none !important}

/* output */
.output{padding:18px 20px;font-family:'JetBrains Mono',monospace;font-size:15px}
.out-line{padding:6px 0;border-bottom:1px dashed rgba(120,160,220,.12)}
.out-line:last-child{border-bottom:none}
.out-line .k{color:var(--muted)}
.res{font-weight:700;padding:2px 10px;border-radius:6px;margin-left:6px}
.res.true{color:var(--green);background:rgba(63,224,138,.12)}
.res.false{color:var(--red);background:rgba(255,107,107,.12)}
.out-list{list-style:none;margin:6px 0 0;padding:0}
.out-list li{padding:6px 0;display:flex;gap:10px;align-items:center}
.out-list .num{color:var(--cyan);font-weight:700;min-width:22px}
.out-chip{display:inline-block;padding:2px 10px;border-radius:6px;background:rgba(34,211,238,.12);color:#Bfefff}
.hint{color:var(--muted);font-size:13px;margin:4px 0 0}

/* ---- Description ---- */
.desc{
  background:linear-gradient(180deg,var(--panel-2),var(--panel));
  border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:26px 28px;
}
.desc h2{font-size:15px;text-transform:uppercase;letter-spacing:2px;color:var(--cyan);
  margin:22px 0 8px;font-family:'JetBrains Mono',monospace}
.desc h2:first-child{margin-top:0}
.desc p{margin:0 0 12px;color:#D6E0EE}
.desc code{font-family:'JetBrains Mono',monospace;background:rgba(34,211,238,.1);
  color:#Bfefff;padding:2px 7px;border-radius:6px;font-size:.92em}
.takeaway,.tip{border-radius:12px;padding:16px 18px;margin-top:16px}
.takeaway{background:rgba(63,224,138,.10);border-left:4px solid var(--green)}
.takeaway b{color:var(--green)}
.tip{background:rgba(242,176,78,.10);border-left:4px solid var(--amber)}
.tip b{color:var(--amber)}

/* ---- Index cards ---- */
.wrap{max-width:1080px;margin:26px auto;padding:0 28px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:22px}
.card{
  display:block;background:linear-gradient(180deg,var(--panel-2),var(--panel));
  border:1px solid var(--line);border-radius:var(--radius);padding:22px;
  box-shadow:var(--shadow);transition:transform .15s ease,border-color .15s ease;
}
.card:hover{transform:translateY(-4px);border-color:rgba(34,211,238,.5)}
.card .ep-tag{font-family:'JetBrains Mono',monospace;font-size:12px;letter-spacing:1px;
  color:var(--cyan);display:inline-block;padding:4px 10px;border:1px solid var(--line);border-radius:999px}
.card h3{color:var(--text);margin:14px 0 6px;font-size:22px}
.card p{color:var(--muted);margin:0}
.card .go{margin-top:14px;color:var(--cyan);font-weight:600;font-family:'JetBrains Mono',monospace}

/* ---- Footer / subscribe ---- */
.footer{max-width:1200px;margin:30px auto 40px;padding:0 28px}
.cta{
  display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;
  background:linear-gradient(90deg,rgba(59,130,246,.14),rgba(34,211,238,.12));
  border:1px solid var(--line);border-radius:var(--radius);padding:22px 26px;
}
.cta h3{margin:0 0 4px;font-size:22px}
.cta p{margin:0;color:var(--muted)}
.sub-btn{
  display:inline-flex;align-items:center;gap:10px;
  background:linear-gradient(90deg,#FF3B30,#FF5F56);color:#fff;font-weight:800;
  padding:14px 26px;border-radius:999px;font-size:17px;
  box-shadow:0 10px 26px rgba(255,59,48,.35);transition:transform .15s ease;
}
.sub-btn:hover{transform:scale(1.05)}
.epnav{display:flex;justify-content:space-between;gap:14px;margin-top:20px;flex-wrap:wrap}
.epnav a{display:inline-flex;align-items:center;gap:8px;padding:12px 18px;border:1px solid var(--line);
  border-radius:12px;color:var(--text);background:rgba(255,255,255,.02);font-weight:600}
.epnav a:hover{border-color:rgba(34,211,238,.5)}
.epnav .muted{color:var(--muted);font-weight:400;font-size:13px}
.copyright{text-align:center;color:var(--muted);font-size:13px;margin-top:26px;
  font-family:'JetBrains Mono',monospace}

/* ---- Responsive ---- */
@media (max-width:900px){
  .grid{grid-template-columns:1fr}
  .topbar{padding:14px 18px}
  .brand-name{font-size:18px}
  .hero{padding:28px 18px 4px}
}

/* ---- Episode video embed ---- */
.video-wrap{max-width:1000px;margin:26px auto 0;padding:0 28px}
.video-frame{position:relative;padding-top:56.25%;border-radius:16px;overflow:hidden;
  border:1px solid var(--line);box-shadow:var(--shadow);background:#000}
.video-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}

/* ---- Video below the program + floating button ---- */
html{scroll-behavior:smooth}
.video-section{max-width:1000px;margin:34px auto 0;padding:0 28px;scroll-margin-top:20px}
.video-title{font-size:16px;text-transform:uppercase;letter-spacing:2px;color:var(--cyan);
  font-family:'JetBrains Mono',monospace;margin:0 0 12px;display:flex;align-items:center;gap:10px}
.yt-dot{width:10px;height:10px;border-radius:50%;background:#FF3B30;box-shadow:0 0 10px #FF3B30;display:inline-block}
.yt-float{position:fixed;right:22px;bottom:22px;z-index:60;display:inline-flex;align-items:center;gap:8px;
  background:linear-gradient(90deg,#FF3B30,#FF5F56);color:#fff;font-weight:800;font-size:15px;
  padding:12px 20px;border-radius:999px;box-shadow:0 10px 26px rgba(255,59,48,.4);
  transition:transform .15s ease}
.yt-float:hover{transform:scale(1.06);color:#fff}
@media (max-width:640px){.yt-float{right:14px;bottom:14px;padding:11px 16px;font-size:14px}}