/* ─────────────────────────────────────────────────────────────
   course-core.css  –  Shared styles for all Automate48 Learn courses
   ───────────────────────────────────────────────────────────── */

/* ── VARIABLES & RESET ── */
:root{--navy:#0d1b2a;--navy-mid:#162032;--navy-light:#1e3048;--navy-dark:#080f18;--gold:#e8a020;--gold-light:#f5c051;--slate:#8fa8c0;--white:#ffffff;--border:rgba(232,160,32,0.15);--success:#2e8b57;--sidebar-w:310px;--teal:#1a7a6e;--teal-light:#21a093;--amber:#c97c10;}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'DM Sans',system-ui,sans-serif;background:var(--navy-dark);color:var(--white);min-height:100vh;overflow-x:hidden}

/* ── TOP NAV ── */
.top-nav{position:fixed;top:0;left:0;right:0;z-index:200;height:60px;background:rgba(8,15,24,0.96);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 24px}
.nav-brand{display:flex;align-items:center;gap:12px;text-decoration:none}
.nav-brand-name{font-family:'Playfair Display',serif;font-size:1rem;font-weight:700;color:var(--white)}
.nav-brand-name span{color:var(--gold)}
.nav-divider{width:1px;height:20px;background:rgba(143,168,192,0.2)}
.nav-course-title{font-size:0.8rem;color:var(--slate);font-weight:500}
.nav-right{display:flex;align-items:center;gap:14px}
.progress-pill{display:flex;align-items:center;gap:8px;background:rgba(232,160,32,0.1);border:1px solid var(--border);border-radius:100px;padding:5px 14px;font-size:0.78rem;font-weight:600;color:var(--gold-light)}
.progress-pill .dot{width:6px;height:6px;background:var(--gold);border-radius:50%}
.btn-quiz-nav{background:var(--gold);color:var(--navy);font-size:0.82rem;font-weight:700;padding:8px 18px;border-radius:6px;border:none;cursor:pointer;font-family:'DM Sans',sans-serif;transition:background 0.2s,opacity 0.2s}
.btn-quiz-nav:hover:not(.locked){background:var(--gold-light)}
.btn-quiz-nav.locked{opacity:0.35;pointer-events:none}
.mobile-menu-btn{display:none;background:none;border:none;color:var(--slate);cursor:pointer;font-size:1.2rem;padding:4px}

/* ── LAYOUT ── */
.layout{display:flex;padding-top:60px;min-height:100vh}

/* ── SIDEBAR ── */
.sidebar{width:var(--sidebar-w);flex-shrink:0;background:var(--navy-mid);border-right:1px solid var(--border);position:fixed;top:60px;left:0;bottom:0;overflow-y:auto;padding:20px 0}
.sidebar::-webkit-scrollbar{width:4px}
.sidebar::-webkit-scrollbar-thumb{background:rgba(143,168,192,0.15);border-radius:2px}
.sidebar-header{padding:0 18px 18px;border-bottom:1px solid rgba(143,168,192,0.1);margin-bottom:6px}
.sidebar-label{font-size:0.65rem;font-weight:600;letter-spacing:0.12em;text-transform:uppercase;color:var(--gold);margin-bottom:6px}
.sidebar-course-title{font-family:'Playfair Display',serif;font-size:0.95rem;font-weight:700;color:var(--white);line-height:1.3}
.overall-progress{margin-top:12px}
.progress-bar-wrap{background:rgba(143,168,192,0.1);border-radius:100px;height:3px;overflow:hidden;margin-top:5px}
.progress-bar-fill{height:100%;background:linear-gradient(90deg,var(--gold),var(--gold-light));border-radius:100px;transition:width 0.4s ease;width:0%}
.progress-text{font-size:0.7rem;color:var(--slate);margin-top:3px}
.lesson-nav-item{display:flex;align-items:flex-start;gap:10px;padding:10px 18px;cursor:pointer;transition:background 0.15s;border-left:3px solid transparent}
.lesson-nav-item:hover{background:rgba(143,168,192,0.05)}
.lesson-nav-item.active{background:rgba(232,160,32,0.08);border-left-color:var(--gold)}
.lesson-nav-item.completed .nav-icon{background:var(--success);border-color:var(--success)}
.nav-icon{width:26px;height:26px;flex-shrink:0;border-radius:50%;border:2px solid rgba(143,168,192,0.25);display:flex;align-items:center;justify-content:center;font-size:0.68rem;font-weight:700;color:var(--slate);transition:all 0.2s}
.nav-icon-check{display:none;color:white;font-size:0.75rem;font-weight:700}
.lesson-nav-item.completed .nav-icon-check{display:block}
.lesson-nav-item.completed .nav-icon-num{display:none}
.lesson-nav-item.active .nav-icon{border-color:var(--gold);color:var(--gold)}
.nav-text-wrap{flex:1;min-width:0}
.nav-lesson-num{font-size:0.62rem;font-weight:600;letter-spacing:0.08em;text-transform:uppercase;color:var(--slate);margin-bottom:1px}
.nav-lesson-name{font-size:0.8rem;font-weight:500;color:var(--white);line-height:1.3}
.lesson-nav-item.active .nav-lesson-name{color:var(--gold-light)}
.sidebar-footer{padding:16px 18px;border-top:1px solid rgba(143,168,192,0.1);margin-top:12px}
.quiz-cta-box{background:rgba(232,160,32,0.07);border:1px solid var(--border);border-radius:10px;padding:14px;text-align:center}
.quiz-cta-box p{font-size:0.76rem;color:var(--slate);margin-bottom:10px;line-height:1.5}
.btn-quiz-sidebar{display:block;background:var(--gold);color:var(--navy);font-size:0.8rem;font-weight:700;padding:9px 14px;border-radius:6px;border:none;cursor:pointer;width:100%;font-family:'DM Sans',sans-serif;text-align:center;transition:background 0.2s,opacity 0.2s}
.btn-quiz-sidebar:hover:not(.locked){background:var(--gold-light)}
.btn-quiz-sidebar.locked{opacity:0.35;pointer-events:none}

/* ── MAIN & LESSON PANELS ── */
.main{margin-left:var(--sidebar-w);flex:1;min-height:calc(100vh - 60px);padding:36px 48px 80px;max-width:900px}
.lesson-panel{display:none}
.lesson-panel.active{display:block;animation:fadeUp 0.3s ease}
@keyframes fadeUp{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}

/* ── LESSON HEADERS ── */
.lesson-eyebrow{font-size:0.7rem;font-weight:600;letter-spacing:0.1em;text-transform:uppercase;color:var(--gold);margin-bottom:8px}
.lesson-title{font-family:'Playfair Display',serif;font-size:clamp(1.5rem,3vw,2.1rem);font-weight:700;color:var(--white);line-height:1.15;letter-spacing:-0.02em;margin-bottom:18px}
.lesson-meta{display:flex;gap:18px;align-items:center;margin-bottom:32px;padding-bottom:22px;border-bottom:1px solid var(--border);flex-wrap:wrap}
.meta-item{display:flex;align-items:center;gap:6px;font-size:0.78rem;color:var(--slate)}

/* ── VIDEO ── */
.video-wrap{background:var(--navy-light);border:1px solid var(--border);border-radius:12px;overflow:hidden;margin-bottom:32px}
.video-embed{width:100%;aspect-ratio:16/9;border:none;display:block}
.video-placeholder{width:100%;aspect-ratio:16/9;display:flex;flex-direction:column;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--navy) 0%,var(--navy-light) 100%);color:var(--slate);gap:10px}
.video-placeholder .icon{font-size:2.5rem;opacity:0.4}
.video-placeholder p{font-size:0.82rem;text-align:center;max-width:240px;line-height:1.5;opacity:0.7}

/* ── CONTENT BLOCKS ── */
.content-block{margin-bottom:28px}
.content-block h3{font-family:'Playfair Display',serif;font-size:1.05rem;font-weight:700;color:var(--white);margin-bottom:12px;display:flex;align-items:center;gap:8px}
.content-block h3::before{content:'';display:inline-block;width:3px;height:16px;background:var(--gold);border-radius:2px;flex-shrink:0}
.content-block p{font-size:0.9rem;color:var(--slate);line-height:1.8;margin-bottom:12px}
.content-block ul{list-style:none;display:flex;flex-direction:column;gap:8px;padding-left:4px}
.content-block ul li{display:flex;align-items:flex-start;gap:8px;font-size:0.87rem;color:var(--slate);line-height:1.65}
.content-block ul li::before{content:'›';color:var(--gold);font-weight:700;flex-shrink:0;margin-top:1px;font-size:1rem}
.content-block strong{color:var(--white);font-weight:600}

/* ── TAKEAWAYS BOX ── */
.takeaways-box{background:var(--navy-light);border:1px solid var(--border);border-radius:12px;padding:24px;margin-bottom:28px}
.takeaways-box h3{font-family:'Playfair Display',serif;font-size:0.95rem;font-weight:700;color:var(--gold-light);margin-bottom:14px}
.takeaways-box ul{list-style:none;display:flex;flex-direction:column;gap:10px}
.takeaways-box li{display:flex;align-items:flex-start;gap:9px;font-size:0.87rem;color:var(--white);line-height:1.6}
.takeaways-box li::before{content:'✓';color:var(--gold);font-weight:700;flex-shrink:0;margin-top:1px}

/* ── ANALOGY BOX ── */
.analogy-box{background:linear-gradient(135deg,rgba(232,160,32,0.08) 0%,rgba(232,160,32,0.03) 100%);border:1px solid rgba(232,160,32,0.25);border-radius:14px;padding:24px 26px;margin-bottom:28px;position:relative;overflow:hidden}
.analogy-box::before{content:'';position:absolute;top:0;left:0;width:4px;height:100%;background:linear-gradient(180deg,var(--gold),var(--gold-light))}
.analogy-box-header{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.analogy-icon{font-size:1.4rem}
.analogy-label{font-size:0.68rem;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;color:var(--gold)}
.analogy-text{font-size:0.92rem;color:var(--white);line-height:1.75;font-style:italic}
.analogy-text strong{font-style:normal;color:var(--gold-light)}

/* ── EXPERT BOX ── */
.expert-box{background:rgba(26,122,110,0.1);border:1px solid rgba(26,122,110,0.3);border-radius:12px;padding:20px 22px;margin-bottom:28px}
.expert-box-header{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.expert-icon{font-size:1.2rem}
.expert-label{font-size:0.68rem;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;color:#4dd9c8}
.expert-title{font-family:'Playfair Display',serif;font-size:0.95rem;font-weight:700;color:var(--white);margin-bottom:6px}
.expert-text{font-size:0.87rem;color:var(--slate);line-height:1.7}

/* ── RESEARCH BOX ── */
.research-box{background:rgba(30,48,72,0.8);border:1px solid rgba(143,168,192,0.2);border-radius:10px;padding:16px 20px;margin-bottom:28px;display:flex;align-items:flex-start;gap:14px}
.research-icon{font-size:1.4rem;flex-shrink:0;margin-top:2px}
.research-label{font-size:0.65rem;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;color:var(--slate);margin-bottom:4px}
.research-terms{font-size:0.87rem;color:var(--white);font-weight:500;line-height:1.6}
.research-terms em{color:var(--gold-light);font-style:normal;font-weight:600}

/* ── REFLECTION BOX ── */
.reflection-box{background:rgba(232,160,32,0.06);border-left:3px solid var(--gold);border-radius:0 8px 8px 0;padding:16px 20px;margin-bottom:28px}
.reflection-box .label{font-size:0.68rem;font-weight:700;letter-spacing:0.08em;text-transform:uppercase;color:var(--gold);margin-bottom:6px}
.reflection-box p{font-size:0.9rem;color:var(--white);line-height:1.65;font-style:italic}

/* ── ACTION ROW ── */
.action-row{display:flex;gap:10px;align-items:center;padding-top:24px;border-top:1px solid var(--border);flex-wrap:wrap}
.btn-complete{display:inline-flex;align-items:center;gap:8px;background:var(--gold);color:var(--navy);font-size:0.88rem;font-weight:700;padding:11px 22px;border-radius:8px;border:none;cursor:pointer;transition:background 0.2s,transform 0.15s;font-family:'DM Sans',sans-serif}
.btn-complete:hover{background:var(--gold-light);transform:translateY(-1px)}
.btn-complete.done{background:var(--success);color:var(--white);cursor:default;transform:none}
.btn-nav{display:inline-flex;align-items:center;gap:6px;background:transparent;border:1px solid rgba(143,168,192,0.2);color:var(--slate);font-size:0.83rem;font-weight:500;padding:10px 18px;border-radius:8px;cursor:pointer;transition:border-color 0.2s,color 0.2s;font-family:'DM Sans',sans-serif}
.btn-nav:hover:not(:disabled){border-color:var(--gold);color:var(--gold-light)}
.btn-nav:disabled{opacity:0.25;pointer-events:none}

/* ── COMPLETE BANNER ── */
.complete-banner{background:linear-gradient(135deg,rgba(46,139,87,0.12),rgba(46,139,87,0.04));border:1px solid rgba(46,139,87,0.25);border-radius:14px;padding:32px;text-align:center;margin-bottom:32px;display:none}
.complete-banner.show{display:block;animation:fadeUp 0.5s ease}
.complete-banner .icon{font-size:2.5rem;margin-bottom:12px}
.complete-banner h2{font-family:'Playfair Display',serif;font-size:1.6rem;color:var(--white);margin-bottom:10px}
.complete-banner p{color:var(--slate);font-size:0.9rem;margin-bottom:20px;line-height:1.65}
.btn-take-quiz{display:inline-flex;align-items:center;gap:10px;background:var(--gold);color:var(--navy);font-size:1rem;font-weight:700;padding:14px 30px;border-radius:8px;border:none;cursor:pointer;font-family:'DM Sans',sans-serif;transition:background 0.2s;box-shadow:0 4px 20px rgba(232,160,32,0.3)}
.btn-take-quiz:hover{background:var(--gold-light)}

/* ── SECTION DIVIDER ── */
.section-divider{height:1px;background:linear-gradient(90deg,transparent,rgba(232,160,32,0.2),transparent);margin:28px 0}

/* ── TOP BANNER (ME / SS) ── */
.top-banner{width:100%;height:220px;background:linear-gradient(135deg,var(--navy-dark) 0%,var(--navy-light) 50%,var(--navy-mid) 100%);display:flex;align-items:center;justify-content:center;overflow:hidden;position:relative;border-bottom:1px solid var(--border)}
.banner-content{text-align:center;z-index:2;position:relative}
.banner-eyebrow{font-size:0.7rem;font-weight:700;letter-spacing:0.15em;text-transform:uppercase;color:var(--gold);margin-bottom:10px}
.banner-title{font-family:'Playfair Display',serif;font-size:clamp(2rem,5vw,3.2rem);font-weight:900;color:var(--white);letter-spacing:-0.02em;line-height:1.05;margin-bottom:8px}
.banner-title span{color:var(--gold)}
.banner-sub{font-size:0.88rem;color:var(--slate);font-weight:400}
.banner-orb{position:absolute;width:400px;height:400px;border-radius:50%;background:radial-gradient(circle,rgba(232,160,32,0.07) 0%,transparent 70%);top:50%;left:50%;transform:translate(-50%,-50%);pointer-events:none}

/* ── QUOTE BOX ── */
.quote-box{position:relative;background:linear-gradient(135deg,rgba(232,160,32,0.07) 0%,rgba(232,160,32,0.02) 100%);border:1px solid rgba(232,160,32,0.22);border-radius:14px;padding:22px 22px 18px 48px;margin-bottom:28px;overflow:hidden}
.quote-box::before{content:'"';position:absolute;top:2px;left:16px;font-family:'Playfair Display',serif;font-size:3.5rem;color:var(--gold);opacity:0.28;line-height:1;pointer-events:none}
.quote-text{font-size:0.95rem;color:var(--white);line-height:1.75;font-style:italic;margin-bottom:10px}
.quote-attr{font-size:0.73rem;color:var(--gold-light);font-weight:600;letter-spacing:0.04em}
.quote-attr span{color:var(--slate);font-weight:400}

/* ── STAT GRID ── */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(155px,1fr));gap:14px;margin-bottom:28px}
.stat-card{background:var(--navy-light);border:1px solid var(--border);border-radius:12px;padding:20px 14px;text-align:center}
.stat-icon{font-size:1.5rem;margin-bottom:8px}
.stat-number{font-family:'Playfair Display',serif;font-size:2.2rem;color:var(--gold);font-weight:900;line-height:1;margin-bottom:5px}
.stat-label{font-size:0.72rem;color:var(--slate);line-height:1.45}
.stat-source{font-size:0.62rem;color:rgba(143,168,192,0.45);margin-top:3px}

/* ── PROBLEM BOX (HPP-COURSE-002) ── */
.problem-box{background:rgba(201,124,16,0.07);border:1px solid rgba(201,124,16,0.22);border-radius:12px;padding:22px 24px;margin-bottom:28px}
.problem-box h3{font-family:'Playfair Display',serif;font-size:0.95rem;font-weight:700;color:var(--gold-light);margin-bottom:12px}
.problem-box ul{list-style:none;display:flex;flex-direction:column;gap:8px}
.problem-box li{display:flex;align-items:flex-start;gap:8px;font-size:0.87rem;color:var(--slate);line-height:1.6}
.problem-box li::before{content:'→';color:var(--gold);font-weight:700;flex-shrink:0}

/* ── INTRO CTA ── */
.intro-cta{background:linear-gradient(135deg,rgba(232,160,32,0.1),rgba(232,160,32,0.03));border:1px solid rgba(232,160,32,0.22);border-radius:14px;padding:28px;text-align:center;margin-bottom:32px}
.intro-cta h3{font-family:'Playfair Display',serif;font-size:1.1rem;color:var(--white);margin-bottom:10px}
.intro-cta p{font-size:0.87rem;color:var(--slate);margin-bottom:18px;line-height:1.65}
.btn-primary{display:inline-flex;align-items:center;gap:8px;background:var(--gold);color:var(--navy);font-size:0.88rem;font-weight:700;padding:12px 24px;border-radius:8px;border:none;cursor:pointer;font-family:'DM Sans',sans-serif;transition:background 0.2s,transform 0.15s}
.btn-primary:hover{background:var(--gold-light);transform:translateY(-1px)}

/* ── SIDEBAR SPECIAL NAV (ME / SS) ── */
.nav-special-item{display:flex;align-items:flex-start;gap:10px;padding:10px 18px;cursor:pointer;transition:background 0.15s;border-left:3px solid transparent}
.nav-special-item:hover{background:rgba(143,168,192,0.05)}
.nav-special-item.active{background:rgba(232,160,32,0.08);border-left-color:var(--gold)}
.nav-special-icon{width:26px;height:26px;flex-shrink:0;border-radius:7px;background:rgba(143,168,192,0.1);display:flex;align-items:center;justify-content:center;font-size:0.82rem}
.nav-special-item.active .nav-special-icon{background:rgba(232,160,32,0.15)}
.nav-special-item.active .nav-lesson-name{color:var(--gold-light)}
.sidebar-section-divider{height:1px;background:rgba(143,168,192,0.08);margin:8px 18px}

/* ── QUIZ ENGINE (ME / SS) ── */
.quiz-info-box{background:rgba(30,48,72,0.8);border:1px solid rgba(143,168,192,0.2);border-radius:10px;padding:16px 20px;margin-bottom:28px;font-size:0.86rem;color:var(--slate);line-height:1.7}
.quiz-wrap{max-width:740px}
.quiz-header-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.quiz-q-label{font-size:0.76rem;color:var(--slate);font-weight:500}
.quiz-score-label{font-size:0.76rem;color:var(--gold);font-weight:700}
.quiz-pb-bg{height:4px;background:rgba(143,168,192,0.1);border-radius:100px;margin-bottom:24px;overflow:hidden}
.quiz-pb-fill{height:100%;background:linear-gradient(90deg,var(--gold),var(--gold-light));border-radius:100px;transition:width 0.4s ease}
.quiz-card{background:var(--navy-light);border:1px solid var(--border);border-radius:14px;padding:28px;margin-bottom:16px}
.quiz-q-text{font-family:'Playfair Display',serif;font-size:1.05rem;color:var(--white);line-height:1.55;margin-bottom:22px}
.quiz-opts{display:flex;flex-direction:column;gap:9px}
.quiz-opt{display:flex;align-items:flex-start;gap:12px;padding:13px 15px;border:1px solid rgba(143,168,192,0.18);border-radius:9px;cursor:pointer;transition:border-color 0.2s,background 0.2s;user-select:none}
.quiz-opt:hover:not(.locked){border-color:rgba(232,160,32,0.45);background:rgba(232,160,32,0.04)}
.opt-badge{width:26px;height:26px;border-radius:50%;border:2px solid rgba(143,168,192,0.3);display:flex;align-items:center;justify-content:center;font-size:0.68rem;font-weight:700;color:var(--slate);flex-shrink:0;transition:all 0.2s;font-family:'DM Sans',sans-serif}
.opt-text{font-size:0.86rem;color:var(--white);line-height:1.55;padding-top:2px}
.quiz-opt.correct{border-color:var(--success);background:rgba(46,139,87,0.08)}
.quiz-opt.correct .opt-badge{background:var(--success);border-color:var(--success);color:#fff}
.quiz-opt.incorrect{border-color:#c94444;background:rgba(201,68,68,0.06)}
.quiz-opt.incorrect .opt-badge{background:rgba(201,68,68,0.2);border-color:#c94444;color:#e08080}
.quiz-opt.locked{pointer-events:none}
.quiz-opt.locked:not(.correct):not(.incorrect){opacity:0.45}
.quiz-feedback{margin-top:14px;padding:13px 16px;border-radius:9px;font-size:0.84rem;line-height:1.65;display:none}
.quiz-feedback.show{display:block}
.quiz-feedback.correct{background:rgba(46,139,87,0.1);border:1px solid rgba(46,139,87,0.3);color:#88d4b0}
.quiz-feedback.incorrect{background:rgba(201,68,68,0.07);border:1px solid rgba(201,68,68,0.2);color:#e09090}
.btn-next-q{display:none;margin-top:16px;background:var(--gold);color:var(--navy);font-size:0.87rem;font-weight:700;padding:10px 22px;border-radius:8px;border:none;cursor:pointer;font-family:'DM Sans',sans-serif;transition:background 0.2s}
.btn-next-q:hover{background:var(--gold-light)}
.btn-next-q.show{display:inline-flex;align-items:center;gap:8px}

/* ── QUIZ RESULTS (ME / SS) ── */
.quiz-results-screen{display:none}
.quiz-results-screen.show{display:block;animation:fadeUp 0.5s ease}
.results-hero{background:var(--navy-light);border:1px solid var(--border);border-radius:16px;padding:40px 32px;text-align:center;margin-bottom:20px}
.results-big-score{font-family:'Playfair Display',serif;font-size:5rem;font-weight:900;line-height:1;margin-bottom:4px}
.results-big-score.pass{color:var(--gold)}
.results-big-score.fail{color:var(--slate)}
.results-fraction{font-size:0.95rem;color:var(--slate);margin-bottom:14px}
.results-status{font-size:1.2rem;font-weight:700;margin-bottom:12px}
.results-status.pass{color:#5cde9e}
.results-status.fail{color:#e08080}
.results-message{font-size:0.87rem;color:var(--slate);line-height:1.7;max-width:520px;margin:0 auto 22px}
.btn-retry{background:transparent;border:1px solid rgba(143,168,192,0.3);color:var(--slate);font-size:0.87rem;font-weight:600;padding:10px 22px;border-radius:8px;cursor:pointer;font-family:'DM Sans',sans-serif;margin-top:6px;transition:border-color 0.2s,color 0.2s}
.btn-retry:hover{border-color:var(--gold);color:var(--gold-light)}

/* ── REFERENCES (ME / SS) ── */
.ref-section{margin-bottom:36px}
.ref-section-title{font-family:'Playfair Display',serif;font-size:1rem;font-weight:700;color:var(--gold-light);margin-bottom:14px;padding-bottom:10px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:8px}
.ref-item{display:flex;align-items:flex-start;gap:10px;padding:11px 0;border-bottom:1px solid rgba(143,168,192,0.07)}
.ref-item:last-child{border-bottom:none}
.ref-num{font-size:0.7rem;color:var(--gold);font-weight:700;flex-shrink:0;min-width:22px;padding-top:2px}
.ref-title{font-size:0.86rem;color:var(--white);font-weight:500;line-height:1.45;margin-bottom:3px}
.ref-meta{font-size:0.75rem;color:var(--slate);line-height:1.5}

/* ── RESPONSIVE ── */
@media(max-width:768px){
  :root{--sidebar-w:0px}
  .sidebar{transform:translateX(-310px);width:310px;transition:transform 0.3s ease;z-index:150}
  .sidebar.open{transform:translateX(0)}
  .mobile-menu-btn{display:block}
  .main{margin-left:0;padding:24px 20px 60px}
  .nav-course-title,.nav-divider{display:none}
}