/* ═══════════════════════════════════════════════════════════════════════
   Digi-Realm Academy — premium dark theme
   Built on the brand's own palette (css/style.css):
     --primary:  #011e41  (deep navy)
     --secondary:#15ACE1  (signal cyan — used here as the "glow" accent)
     --light:    #F4F7FE
     --dark:     #14183E
   ═══════════════════════════════════════════════════════════════════════ */
:root {
  --dra-navy: #011e41;
  --dra-navy-deep: #000a1a;
  --dra-cyan: #15ACE1;
  --dra-cyan-soft: rgba(21, 172, 225, 0.15);
  --dra-light: #F4F7FE;
  --dra-dark: #14183E;
  --dra-border: rgba(255,255,255,0.08);
  --dra-text-dim: rgba(244,247,254,0.65);
  --dra-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* { box-sizing: border-box; }

body.dra-body {
  background: radial-gradient(ellipse at top, #071633 0%, #000a1a 55%, #000509 100%);
  color: var(--dra-light);
  font-family: var(--dra-font);
  min-height: 100vh;
  margin: 0;
}

.dra-container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

/* Navbar */
.dra-nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(1, 30, 65, 0.72);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--dra-border);
}
.dra-nav-inner { display: flex; align-items: center; justify-content: space-between; padding: 16px 24px; max-width: 1180px; margin: 0 auto; }
.dra-brand { font-weight: 800; font-size: 1.3rem; color: #fff; text-decoration: none; letter-spacing: .3px; }
.dra-brand span { color: var(--dra-cyan); }
.dra-nav-links { display: flex; align-items: center; gap: 28px; }
.dra-nav-links a { color: var(--dra-text-dim); text-decoration: none; font-size: .92rem; font-weight: 500; transition: color .2s; }
.dra-nav-links a:hover, .dra-nav-links a.active { color: var(--dra-cyan); }
.dra-btn-glow {
  background: linear-gradient(135deg, var(--dra-cyan), #0e7bab);
  color: #001420 !important; font-weight: 700; padding: 10px 22px; border-radius: 999px;
  box-shadow: 0 0 24px rgba(21,172,225,.45); border: none; cursor: pointer; font-size: .88rem;
}
.dra-btn-glow:hover { box-shadow: 0 0 36px rgba(21,172,225,.7); }
.dra-btn-outline {
  border: 1px solid rgba(255,255,255,.25); color: #fff !important; padding: 9px 20px; border-radius: 999px;
  font-size: .88rem; font-weight: 600; text-decoration: none; background: transparent;
}

/* Hero */
.dra-hero { padding: 100px 24px 70px; text-align: center; position: relative; overflow: hidden; }
.dra-hero::before {
  content: ''; position: absolute; inset: 0; z-index: 0;
  background: radial-gradient(circle at 50% 0%, rgba(21,172,225,.18), transparent 60%);
  animation: dra-pulse 6s ease-in-out infinite;
}
@keyframes dra-pulse { 0%,100% { opacity: .7; } 50% { opacity: 1; } }
.dra-eyebrow {
  display: inline-block; color: var(--dra-cyan); font-size: .75rem; font-weight: 700; letter-spacing: 2.5px;
  text-transform: uppercase; background: var(--dra-cyan-soft); padding: 7px 16px; border-radius: 999px; margin-bottom: 24px;
  border: 1px solid rgba(21,172,225,.3);
}
.dra-hero h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); font-weight: 800; line-height: 1.1; margin: 0 0 20px; position: relative; z-index: 1; }
.dra-hero h1 .grad { background: linear-gradient(135deg, #fff, var(--dra-cyan)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.dra-hero p.lead { color: var(--dra-text-dim); font-size: 1.15rem; max-width: 640px; margin: 0 auto 34px; position: relative; z-index: 1; }

/* Cards / grid */
.dra-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 22px; padding: 40px 0 90px; }
.dra-card {
  background: linear-gradient(160deg, rgba(255,255,255,.04), rgba(255,255,255,.01));
  border: 1px solid var(--dra-border); border-radius: 18px; padding: 26px; position: relative; overflow: hidden;
  transition: transform .25s, border-color .25s, box-shadow .25s;
}
.dra-card:hover { transform: translateY(-4px); border-color: rgba(21,172,225,.4); box-shadow: 0 12px 40px rgba(21,172,225,.12); }
.dra-card .cat { color: var(--dra-cyan); font-size: .7rem; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; }
.dra-card h3 { font-size: 1.15rem; margin: 10px 0 8px; color: #fff; }
.dra-card p { color: var(--dra-text-dim); font-size: .88rem; line-height: 1.55; margin: 0 0 18px; }
.dra-card .meta { display: flex; justify-content: space-between; font-size: .78rem; color: var(--dra-text-dim); border-top: 1px solid var(--dra-border); padding-top: 14px; }
.dra-badge { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: .68rem; font-weight: 700; text-transform: uppercase; letter-spacing: .5px; }
.dra-badge.beginner { background: rgba(21,172,225,.15); color: var(--dra-cyan); }
.dra-badge.intermediate { background: rgba(255,183,77,.15); color: #ffb74d; }
.dra-badge.advanced { background: rgba(255,90,90,.15); color: #ff5a5a; }

/* Buttons / forms shared */
.dra-section { padding: 60px 0; }
.dra-form { max-width: 440px; margin: 60px auto; background: rgba(255,255,255,.03); border: 1px solid var(--dra-border); border-radius: 20px; padding: 40px; }
.dra-form h2 { margin-top: 0; }
.dra-form label { display: block; font-size: .82rem; color: var(--dra-text-dim); margin: 16px 0 6px; font-weight: 600; }
.dra-form input, .dra-form select, .dra-form textarea {
  width: 100%; background: rgba(255,255,255,.05); border: 1px solid var(--dra-border); border-radius: 10px;
  padding: 12px 14px; color: #fff; font-size: .92rem; font-family: var(--dra-font);
}
.dra-form input:focus, .dra-form textarea:focus { outline: none; border-color: var(--dra-cyan); }
.dra-alert { padding: 12px 16px; border-radius: 10px; font-size: .85rem; margin-bottom: 18px; }
.dra-alert.err { background: rgba(255,90,90,.12); color: #ff8484; border: 1px solid rgba(255,90,90,.3); }
.dra-alert.ok { background: rgba(76,217,123,.12); color: #4cd97b; border: 1px solid rgba(76,217,123,.3); }

/* Course viewer layout */
.dra-viewer { display: grid; grid-template-columns: 320px 1fr; min-height: 100vh; }
.dra-sidebar { background: rgba(0,0,0,.35); border-right: 1px solid var(--dra-border); padding: 24px 0; overflow-y: auto; max-height: 100vh; position: sticky; top: 0; }
.dra-sidebar-header { padding: 0 20px 18px; border-bottom: 1px solid var(--dra-border); margin-bottom: 10px; }
.dra-topic-group { padding: 10px 20px 4px; font-size: .72rem; font-weight: 800; color: var(--dra-cyan); text-transform: uppercase; letter-spacing: 1px; }
.dra-lesson-item {
  display: block; width: 100%; text-align: left; padding: 10px 20px; background: none; border: none; color: var(--dra-text-dim);
  font-size: .85rem; cursor: pointer; border-left: 3px solid transparent; text-decoration: none;
}
.dra-lesson-item:hover { background: rgba(255,255,255,.03); }
.dra-lesson-item.active { background: var(--dra-cyan-soft); color: #fff; border-left-color: var(--dra-cyan); font-weight: 600; }
.dra-main { padding: 40px 50px; max-width: 900px; }
.dra-storyboard {
  background: linear-gradient(135deg, #001830, #000a1a); border: 1px solid rgba(21,172,225,.25); border-radius: 18px;
  padding: 26px 30px; margin-bottom: 26px; box-shadow: 0 0 40px rgba(21,172,225,.08) inset;
}
.dra-storyboard .label { color: var(--dra-cyan); font-size: .72rem; font-weight: 800; text-transform: uppercase; letter-spacing: 1.5px; margin-bottom: 10px; display: block; }
.dra-diagram-box { background: rgba(255,255,255,.03); border: 1px dashed rgba(21,172,225,.35); border-radius: 14px; padding: 20px; margin-bottom: 26px; }
.dra-lesson-body { background: rgba(255,255,255,.02); border: 1px solid var(--dra-border); border-radius: 18px; padding: 30px; line-height: 1.75; font-size: .96rem; }
.dra-lesson-body p { margin: 0 0 16px; color: rgba(244,247,254,.9); }
.dra-quote { border-left: 3px solid var(--dra-cyan); background: var(--dra-cyan-soft); padding: 14px 18px; margin: 0 0 18px; border-radius: 0 10px 10px 0; font-style: italic; }
.dra-code { background: #000; border: 1px solid var(--dra-border); border-radius: 10px; padding: 16px; overflow-x: auto; color: #7ee787; font-family: 'Fira Code', monospace; font-size: .85rem; }

/* Milestone / modal blocks */
.dra-milestone {
  background: linear-gradient(135deg, rgba(21,172,225,.15), rgba(21,172,225,.02));
  border: 1px solid rgba(21,172,225,.4); border-radius: 18px; padding: 28px; margin-bottom: 24px; position: relative;
}
.dra-milestone .tag { color: var(--dra-cyan); font-weight: 800; font-size: .75rem; text-transform: uppercase; letter-spacing: 1.5px; }
.dra-milestone h3 { margin: 8px 0 10px; font-size: 1.3rem; }

.dra-modal-overlay {
  position: fixed; inset: 0; background: rgba(0,5,10,.85); backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center; z-index: 999;
}
.dra-modal {
  background: linear-gradient(160deg, #071633, #000a1a); border: 1px solid rgba(21,172,225,.4); border-radius: 24px;
  padding: 46px; max-width: 480px; text-align: center; box-shadow: 0 0 80px rgba(21,172,225,.25);
  animation: dra-modal-in .4s cubic-bezier(.2,.8,.2,1);
}
@keyframes dra-modal-in { from { opacity: 0; transform: scale(.92) translateY(10px); } to { opacity: 1; transform: none; } }
.dra-modal .icon-glow { font-size: 2.6rem; margin-bottom: 14px; filter: drop-shadow(0 0 16px rgba(21,172,225,.7)); }

/* Quiz */
.dra-quiz-q { background: rgba(255,255,255,.02); border: 1px solid var(--dra-border); border-radius: 16px; padding: 22px; margin-bottom: 16px; }
.dra-option {
  display: flex; align-items: center; gap: 12px; width: 100%; text-align: left; background: rgba(255,255,255,.03);
  border: 1px solid var(--dra-border); border-radius: 12px; padding: 13px 16px; margin-bottom: 10px; color: #fff;
  cursor: pointer; font-size: .9rem; font-family: var(--dra-font);
}
.dra-option:hover { border-color: rgba(21,172,225,.4); }
.dra-option.selected { border-color: var(--dra-cyan); background: var(--dra-cyan-soft); }
.dra-option .letter { width: 26px; height: 26px; border-radius: 50%; background: rgba(255,255,255,.08); display: flex; align-items: center; justify-content: center; font-size: .78rem; font-weight: 700; flex-shrink: 0; }
.dra-result-hero { border-radius: 22px; padding: 46px; text-align: center; margin-bottom: 26px; }
.dra-result-hero.pass { background: linear-gradient(135deg, #0a3d2e, #062a1f); border: 1px solid rgba(76,217,123,.4); }
.dra-result-hero.fail { background: linear-gradient(135deg, #3d0a0a, #2a0606); border: 1px solid rgba(255,90,90,.4); }
.dra-result-hero .score { font-size: 3.4rem; font-weight: 800; }
.dra-microwin { background: rgba(76,217,123,.08); border: 1px solid rgba(76,217,123,.3); border-radius: 12px; padding: 14px 18px; margin-bottom: 12px; font-size: .87rem; }
.dra-microwin.wrong { background: rgba(255,90,90,.08); border-color: rgba(255,90,90,.3); }

/* Certificate preview */
.dra-cert-wrap { max-width: 900px; margin: 40px auto; }
.dra-cert {
  aspect-ratio: 1.414 / 1; background: linear-gradient(160deg, #071633, #000a1a); border: 2px solid var(--dra-cyan);
  border-radius: 6px; padding: 60px; text-align: center; position: relative; box-shadow: 0 0 60px rgba(21,172,225,.25);
}
.dra-cert::before { content: ''; position: absolute; inset: 14px; border: 1px solid rgba(21,172,225,.35); border-radius: 4px; }

/* Utility */
.dra-progress-bar { height: 6px; background: rgba(255,255,255,.08); border-radius: 999px; overflow: hidden; }
.dra-progress-bar .fill { height: 100%; background: linear-gradient(90deg, var(--dra-cyan), #4cd97b); }
.dra-footer { text-align: center; padding: 40px 24px; color: var(--dra-text-dim); font-size: .8rem; border-top: 1px solid var(--dra-border); margin-top: 40px; }
@media (max-width: 860px) { .dra-viewer { grid-template-columns: 1fr; } .dra-sidebar { position: static; max-height: none; } }

/* Lesson tables */
.dra-table-wrap { overflow-x: auto; margin: 0 0 18px; }
.dra-table { width: 100%; border-collapse: collapse; font-size: .9rem; }
.dra-table th, .dra-table td { border: 1px solid var(--dra-border); padding: 10px 14px; text-align: left; }
.dra-table th { background: var(--dra-cyan-soft); color: var(--dra-cyan); font-weight: 700; }
.dra-table td { color: rgba(244,247,254,.9); }

/* ── Topic media (finished diagram / video) ───────────────────────────── */
.dra-video-wrap{position:relative;width:100%;aspect-ratio:16/9;margin:0 0 22px;border-radius:14px;overflow:hidden;
  border:1px solid var(--dra-border);background:#000;}
.dra-video-wrap iframe,.dra-video-wrap video{position:absolute;inset:0;width:100%;height:100%;border:0;display:block;}
.dra-topic-figure{margin:0 0 22px;}
.dra-topic-figure img{width:100%;height:auto;display:block;border-radius:14px;border:1px solid var(--dra-border);background:rgba(255,255,255,.03);}
.dra-topic-figure figcaption{margin-top:8px;font-size:.82rem;color:var(--dra-text-dim);text-align:center;}

/* ── Lesson headings (worked-example sections) ────────────────────────── */
.dra-lesson-body .dra-lesson-h{
  color:var(--dra-cyan);font-size:1.02rem;font-weight:700;letter-spacing:.01em;
  margin:26px 0 10px;padding-top:14px;border-top:1px solid var(--dra-border);
}
.dra-lesson-body .dra-lesson-h:first-child{border-top:0;padding-top:0;margin-top:0;}