/* ═══════════════════════════════════════════════════════════
   NetSim v2 — Complete Dark Cyber Design System
   ═══════════════════════════════════════════════════════════ */
:root {
  --bg-deep:    #020817;
  --bg-card:    rgba(10, 18, 40, 0.85);
  --bg-glass:   rgba(8, 16, 40, 0.78);
  --border:     rgba(99, 179, 237, 0.15);
  --border-glow:rgba(99, 179, 237, 0.45);

  --neon-blue:   #00d4ff;
  --neon-purple: #b45aff;
  --neon-green:  #00ff88;
  --neon-yellow: #ffd700;
  --neon-red:    #ff4d6d;
  --neon-orange: #ff9500;

  --day3: #00d4ff;
  --day4: #b45aff;
  --day5: #00ff88;

  --text-primary:   #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted:     #4a5568;

  --font-main: 'Space Grotesk', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --glow-blue:   0 0 20px rgba(0,212,255,0.35), 0 0 60px rgba(0,212,255,0.12);
  --glow-purple: 0 0 20px rgba(180,90,255,0.35), 0 0 60px rgba(180,90,255,0.12);
  --glow-green:  0 0 20px rgba(0,255,136,0.35), 0 0 60px rgba(0,255,136,0.12);
  --glow-red:    0 0 20px rgba(255,77,109,0.45), 0 0 60px rgba(255,77,109,0.18);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg-deep);color:var(--text-primary);font-family:var(--font-main);overflow-x:hidden;line-height:1.65}
code{font-family:var(--font-mono);font-size:0.85em;color:var(--neon-blue);background:rgba(0,212,255,0.08);padding:0.1em 0.35em;border-radius:4px}
strong{color:var(--text-primary)}
::-webkit-scrollbar{width:5px}
::-webkit-scrollbar-track{background:var(--bg-deep)}
::-webkit-scrollbar-thumb{background:rgba(0,212,255,0.25);border-radius:3px}
.hidden{display:none!important}

/* ─── LOADER ─────────────────────────────────────────────── */
#loader{position:fixed;inset:0;z-index:9999;background:var(--bg-deep);display:flex;align-items:center;justify-content:center;transition:opacity 0.8s ease}
#loader.fade-out{opacity:0;pointer-events:none}
.loader-inner{text-align:center;max-width:420px;padding:0 1rem;width:100%}
.loader-ring{width:70px;height:70px;border:2px solid rgba(0,212,255,0.12);border-top-color:var(--neon-blue);border-radius:50%;margin:0 auto 1.4rem;animation:spin 0.9s linear infinite}
.loader-text{font-family:var(--font-mono);color:var(--neon-blue);font-size:0.75rem;letter-spacing:0.18em;margin-bottom:0.4rem}
.loader-sub{font-family:var(--font-mono);font-size:0.6rem;color:var(--text-muted);letter-spacing:0.12em;margin-bottom:1.2rem}
.loader-progress{width:min(320px,88vw);height:2px;background:rgba(0,212,255,0.1);border-radius:1px;overflow:hidden;margin:0 auto}
#loader-bar{height:100%;width:0%;background:linear-gradient(90deg,var(--neon-blue),var(--neon-purple));box-shadow:var(--glow-blue);transition:width 0.08s linear}
.blink{animation:blink 1s step-start infinite}
@keyframes blink{50%{opacity:0}}
@keyframes spin{to{transform:rotate(360deg)}}

/* ─── NAV ────────────────────────────────────────────────── */
#navbar{position:fixed;top:0;left:0;right:0;z-index:200;display:flex;align-items:center;gap:0.8rem;padding:0.55rem 1.2rem;background:rgba(2,8,23,0.9);backdrop-filter:blur(20px);border-bottom:1px solid var(--border);transform:translateY(-100%);transition:transform 0.6s cubic-bezier(0.22,1,0.36,1);flex-wrap:wrap}
#navbar.visible{transform:translateY(0)}
.nav-logo{font-size:1rem;font-weight:700;color:var(--neon-blue);text-shadow:var(--glow-blue);letter-spacing:0.06em;margin-right:0.4rem}
.nav-pills{display:flex;align-items:center;gap:0.2rem;flex-wrap:wrap}
.nav-day{font-family:var(--font-mono);font-size:0.58rem;font-weight:700;letter-spacing:0.14em;padding:0.2rem 0.5rem;border-radius:100px;margin:0 0.2rem}
.day3-badge{background:rgba(0,212,255,0.12);color:var(--day3);border:1px solid rgba(0,212,255,0.3)}
.day4-badge{background:rgba(180,90,255,0.12);color:var(--day4);border:1px solid rgba(180,90,255,0.3)}
.day5-badge{background:rgba(0,255,136,0.12);color:var(--day5);border:1px solid rgba(0,255,136,0.3)}
.nav-link{font-family:var(--font-mono);font-size:0.62rem;font-weight:600;letter-spacing:0.1em;color:var(--text-muted);text-decoration:none;padding:0.25rem 0.5rem;border-radius:4px;border:1px solid transparent;transition:all 0.2s}
.nav-link:hover,.nav-link.active{color:var(--neon-blue);border-color:rgba(0,212,255,0.3);background:rgba(0,212,255,0.07)}
.nav-link-special{color:var(--neon-yellow)!important}
.nav-link-special:hover,.nav-link-special.active{border-color:rgba(255,215,0,0.4)!important;background:rgba(255,215,0,0.07)!important}

/* ─── CANVAS ─────────────────────────────────────────────── */
#bg-canvas{position:fixed;inset:0;z-index:0;pointer-events:none}
#main-scroll{position:relative;z-index:1}

/* ─── SECTIONS ───────────────────────────────────────────── */
.scene-section{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:5.5rem 1.5rem 4rem;position:relative}
.scene-content{width:100%;max-width:900px}

/* ─── GLASS PANEL ────────────────────────────────────────── */
.glass-panel{background:var(--bg-glass);backdrop-filter:blur(28px);border:1px solid var(--border);border-radius:22px;padding:2.8rem;position:relative;box-shadow:0 8px 40px rgba(0,0,0,0.5),inset 0 1px 0 rgba(255,255,255,0.04)}
.glass-panel::before{content:'';position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,var(--neon-blue),var(--neon-purple),transparent);border-radius:22px 22px 0 0;opacity:0.5}

/* ─── BADGES ─────────────────────────────────────────────── */
.scene-badge{font-family:var(--font-mono);font-size:0.65rem;letter-spacing:0.18em;color:var(--neon-blue);display:inline-block;padding:0.22rem 0.7rem;border:1px solid rgba(0,212,255,0.28);border-radius:100px;background:rgba(0,212,255,0.06);margin-bottom:0.9rem;text-transform:uppercase}
.badge-day3{color:var(--day3);border-color:rgba(0,212,255,0.3);background:rgba(0,212,255,0.06)}
.badge-day4{color:var(--day4);border-color:rgba(180,90,255,0.3);background:rgba(180,90,255,0.06)}
.badge-day5{color:var(--day5);border-color:rgba(0,255,136,0.3);background:rgba(0,255,136,0.06)}

/* ─── TITLES ─────────────────────────────────────────────── */
.scene-title{font-size:clamp(1.8rem,4vw,2.8rem);font-weight:700;line-height:1.15;margin-bottom:1.2rem;background:linear-gradient(135deg,#e2e8f0 0%,var(--neon-blue) 55%,var(--neon-purple) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
h1.scene-title{font-size:clamp(2.2rem,5.5vw,3.6rem)}
.scene-desc{color:var(--text-secondary);font-size:1rem;max-width:640px;margin-bottom:1.5rem}

/* ─── GLITCH ─────────────────────────────────────────────── */
.glitch{position:relative}
.glitch::before,.glitch::after{content:attr(data-text);position:absolute;top:0;left:0;right:0;background:linear-gradient(135deg,#e2e8f0 0%,var(--neon-blue) 55%,var(--neon-purple) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.glitch::before{animation:glitch1 4s infinite;clip-path:polygon(0 0,100% 0,100% 40%,0 40%)}
.glitch::after{animation:glitch2 4s infinite;clip-path:polygon(0 60%,100% 60%,100% 100%,0 100%)}
@keyframes glitch1{0%,88%,100%{transform:none;opacity:1}90%{transform:translate(-2px,1px) skewX(-2deg);opacity:.7}93%{transform:translate(2px,-1px) skewX(2deg);opacity:.7}}
@keyframes glitch2{0%,85%,100%{transform:none;opacity:1}87%{transform:translate(2px,2px) skewX(3deg);opacity:.5}90%{transform:translate(-2px,-2px);opacity:.5}}

/* ─── BUTTONS ────────────────────────────────────────────── */
.btn-primary{display:inline-flex;align-items:center;gap:0.5rem;background:linear-gradient(135deg,var(--neon-blue),var(--neon-purple));color:#020817;font-family:var(--font-mono);font-size:0.8rem;font-weight:700;letter-spacing:0.08em;padding:0.8rem 1.8rem;border:none;border-radius:8px;cursor:pointer;box-shadow:var(--glow-blue);transition:all 0.3s;margin-top:0.5rem}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 0 30px rgba(0,212,255,0.55),0 0 80px rgba(0,212,255,0.2)}
.btn-secondary{display:inline-flex;align-items:center;gap:0.4rem;background:transparent;color:var(--neon-blue);font-family:var(--font-mono);font-size:0.75rem;font-weight:600;letter-spacing:0.08em;padding:0.55rem 1.3rem;border:1px solid rgba(0,212,255,0.38);border-radius:6px;cursor:pointer;transition:all 0.22s;margin-top:1.4rem}
.btn-secondary:hover{background:rgba(0,212,255,0.09);border-color:var(--neon-blue);box-shadow:var(--glow-blue);transform:translateY(-1px)}

/* ─── SIM TITLE ──────────────────────────────────────────── */
.sim-title{font-family:var(--font-mono);font-size:0.72rem;letter-spacing:0.15em;color:var(--neon-red);margin:1.6rem 0 0.8rem;display:flex;align-items:center;gap:0.5rem}
.sim-title::after{content:'';flex:1;height:1px;background:linear-gradient(90deg,rgba(255,77,109,0.4),transparent)}

/* ─── CONCEPT CARDS ──────────────────────────────────────── */
.concept-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1rem;margin-bottom:0.5rem}
.concept-card{background:rgba(0,0,0,0.25);border:1px solid var(--border);border-radius:14px;padding:1.2rem 1.3rem}
.cc-icon{font-size:2rem;margin-bottom:0.5rem}
.cc-title{font-size:0.85rem;font-weight:700;color:var(--neon-blue);margin-bottom:0.6rem;letter-spacing:0.04em}
.cc-list{list-style:none;display:flex;flex-direction:column;gap:0.3rem}
.cc-list li{font-size:0.85rem;color:var(--text-secondary);padding-left:0.8rem;position:relative}
.cc-list li::before{content:'▸';position:absolute;left:0;color:var(--neon-purple)}

/* ─── COMPARE TABLE ──────────────────────────────────────── */
.compare-table{background:rgba(0,0,0,0.25);border:1px solid var(--border);border-radius:14px;padding:1.2rem;overflow:hidden}
.ct-header{font-size:0.82rem;font-weight:700;color:var(--neon-blue);margin-bottom:0.8rem}
.compare-table table{width:100%;border-collapse:collapse;font-size:0.78rem}
.compare-table th{color:var(--text-muted);font-family:var(--font-mono);font-size:0.65rem;letter-spacing:0.1em;padding:0.4rem 0.6rem;border-bottom:1px solid var(--border)}
.compare-table td{padding:0.38rem 0.6rem;color:var(--text-secondary);border-bottom:1px solid rgba(255,255,255,0.04)}
.compare-table .yes{color:var(--neon-green)}
.compare-table .no{color:var(--neon-red)}
.compare-table .fast{color:var(--neon-yellow);font-weight:700}

/* ─── KEY FACT ───────────────────────────────────────────── */
.key-fact{background:rgba(0,212,255,0.06);border:1px solid rgba(0,212,255,0.2);border-left:3px solid var(--neon-blue);border-radius:8px;padding:0.8rem 1.1rem;font-size:0.85rem;color:var(--text-secondary);margin-top:1.2rem}

/* ─── TERMINAL ───────────────────────────────────────────── */
.terminal-box{background:#0a0f1f;border:1px solid rgba(0,212,255,0.18);border-radius:10px;padding:1rem 1.2rem;margin-top:1.2rem;font-family:var(--font-mono)}
.terminal-header{font-size:0.65rem;color:var(--text-muted);letter-spacing:0.12em;margin-bottom:0.7rem;text-transform:uppercase}
.terminal-line{display:flex;align-items:baseline;flex-wrap:wrap;gap:0.4rem;margin-bottom:0.35rem;font-size:0.78rem}
.t-prompt{color:var(--neon-green);font-weight:700}
.t-cmd{color:var(--neon-yellow)}
.t-comment{color:var(--text-muted);font-size:0.7rem}

/* ─── QUIZ BOX ───────────────────────────────────────────── */
.quiz-box{background:rgba(180,90,255,0.07);border:1px solid rgba(180,90,255,0.25);border-radius:10px;padding:1rem 1.2rem;margin-top:1.2rem}
.quiz-q{font-size:0.88rem;color:var(--text-secondary);font-style:italic}

/* ─── TAGS ───────────────────────────────────────────────── */
.tag{font-family:var(--font-mono);font-size:0.7rem;font-weight:700;padding:0.15rem 0.5rem;border-radius:4px}
.tag-dns  {background:rgba(255,215,0,0.15);color:var(--neon-yellow);border:1px solid rgba(255,215,0,0.35)}
.tag-tcp  {background:rgba(0,212,255,0.15);color:var(--neon-blue);border:1px solid rgba(0,212,255,0.35)}
.tag-tls  {background:rgba(0,255,136,0.15);color:var(--neon-green);border:1px solid rgba(0,255,136,0.35)}
.tag-http {background:rgba(180,90,255,0.15);color:var(--neon-purple);border:1px solid rgba(180,90,255,0.35)}
.tag-route{background:rgba(255,149,0,0.15);color:var(--neon-orange);border:1px solid rgba(255,149,0,0.35)}
.tag-fw   {background:rgba(255,77,109,0.15);color:var(--neon-red);border:1px solid rgba(255,77,109,0.35)}
.tag-done {background:rgba(0,255,136,0.18);color:var(--neon-green);border:1px solid rgba(0,255,136,0.4)}
.tag-syn    {background:rgba(0,212,255,0.18);color:var(--neon-blue);border:1px solid rgba(0,212,255,0.4);font-family:var(--font-mono);font-size:0.75rem;padding:0.1rem 0.45rem;border-radius:4px}
.tag-synack {background:rgba(180,90,255,0.18);color:var(--neon-purple);border:1px solid rgba(180,90,255,0.4);font-family:var(--font-mono);font-size:0.75rem;padding:0.1rem 0.45rem;border-radius:4px}
.tag-ack    {background:rgba(0,255,136,0.18);color:var(--neon-green);border:1px solid rgba(0,255,136,0.4);font-family:var(--font-mono);font-size:0.75rem;padding:0.1rem 0.45rem;border-radius:4px}

.good{color:var(--neon-green)}
.bad{color:var(--neon-red)}

/* ─── SCROLL HINT ────────────────────────────────────────── */
.scroll-hint{position:absolute;bottom:1.8rem;left:50%;transform:translateX(-50%);font-family:var(--font-mono);font-size:0.65rem;letter-spacing:0.18em;color:var(--text-muted);animation:float 2s ease-in-out infinite}
@keyframes float{0%,100%{transform:translateX(-50%) translateY(0)}50%{transform:translateX(-50%) translateY(-7px)}}

/* ─── NODE LEGEND ────────────────────────────────────────── */
.node-legend{display:flex;gap:1.4rem;margin-top:1.5rem;flex-wrap:wrap}
.legend-item{display:flex;align-items:center;gap:0.4rem;font-size:0.75rem;color:var(--text-secondary)}
.dot{width:9px;height:9px;border-radius:50%}
.dot-blue  {background:var(--neon-blue);box-shadow:0 0 7px var(--neon-blue)}
.dot-green {background:var(--neon-green);box-shadow:0 0 7px var(--neon-green)}
.dot-purple{background:var(--neon-purple);box-shadow:0 0 7px var(--neon-purple)}
.dot-yellow{background:var(--neon-yellow);box-shadow:0 0 7px var(--neon-yellow)}
.dot-red   {background:var(--neon-red);box-shadow:0 0 7px var(--neon-red)}

/* ─── DAY DIVIDERS ───────────────────────────────────────── */
.day-divider{display:flex;align-items:center;justify-content:center;padding:3rem 2rem;position:relative;z-index:1}
.day-div-inner{text-align:center;padding:1.5rem 3rem;border-radius:16px;border:1px solid;display:flex;flex-direction:column;gap:0.3rem}
.day3-div .day-div-inner{border-color:rgba(0,212,255,0.25);background:rgba(0,212,255,0.05)}
.day4-div .day-div-inner{border-color:rgba(180,90,255,0.25);background:rgba(180,90,255,0.05)}
.day5-div .day-div-inner{border-color:rgba(0,255,136,0.25);background:rgba(0,255,136,0.05)}
.day-div-label{font-family:var(--font-mono);font-size:0.65rem;letter-spacing:0.2em;opacity:0.7}
.day3-div .day-div-label{color:var(--day3)}
.day4-div .day-div-label{color:var(--day4)}
.day5-div .day-div-label{color:var(--day5)}
.day-div-title{font-size:1.3rem;font-weight:700}
.day3-div .day-div-title{color:var(--day3)}
.day4-div .day-div-title{color:var(--day4)}
.day5-div .day-div-title{color:var(--day5)}
.day-div-sub{font-size:0.82rem;color:var(--text-secondary)}

/* ═══════════ INTRO ══════════════════════════════════════ */
.intro-panel{max-width:900px}
.intro-badge{font-family:var(--font-mono);font-size:0.7rem;letter-spacing:0.2em;color:var(--neon-blue);background:rgba(0,212,255,0.08);border:1px solid rgba(0,212,255,0.25);border-radius:100px;display:inline-block;padding:0.3rem 0.9rem;margin-bottom:1rem}
.intro-days{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:0.8rem;margin:1.4rem 0}
.day-card{background:rgba(0,0,0,0.3);border-radius:12px;padding:1.1rem;border:1px solid}
.day3{border-color:rgba(0,212,255,0.25)}
.day4{border-color:rgba(180,90,255,0.25)}
.day5{border-color:rgba(0,255,136,0.25)}
.day-num{font-family:var(--font-mono);font-size:0.65rem;letter-spacing:0.15em;margin-bottom:0.3rem}
.day3 .day-num{color:var(--day3)}
.day4 .day-num{color:var(--day4)}
.day5 .day-num{color:var(--day5)}
.day-topics{font-size:0.9rem;font-weight:600;margin-bottom:0.25rem}
.day-desc{font-size:0.75rem;color:var(--text-secondary)}
.scenario-teaser{display:flex;flex-wrap:wrap;align-items:center;gap:0.35rem;margin:1.2rem 0;font-size:0.85rem}
.tag-url{font-family:var(--font-mono);color:var(--neon-yellow);font-weight:700}
.arr{color:var(--neon-purple);font-size:1rem}

/* ═══════════ DNS ════════════════════════════════════════ */
.dns-sim-wrap{margin:0.5rem 0 1rem}
.dns-query-bar{display:flex;align-items:center;gap:0.5rem;font-family:var(--font-mono);font-size:0.85rem;margin-bottom:1rem;background:rgba(0,0,0,0.3);border:1px solid var(--border);border-radius:8px;padding:0.6rem 1rem}
.dns-you{color:var(--neon-blue);font-weight:700}
.dns-types{color:var(--text-muted)}
#dns-typed-text{color:var(--neon-yellow);min-width:120px}
.dns-cursor{color:var(--neon-yellow)}
.dns-chain{display:flex;align-items:flex-start;flex-wrap:wrap;gap:0.3rem;margin-bottom:1rem}
.dns-node{background:rgba(0,0,0,0.3);border:1px solid var(--border);border-radius:12px;padding:0.8rem;text-align:center;min-width:100px;flex:1;transition:all 0.4s}
.dns-node-icon{font-size:1.8rem;margin-bottom:0.2rem}
.dns-node-label{font-family:var(--font-mono);font-size:0.7rem;font-weight:700;color:var(--text-secondary)}
.dns-node-sub{font-size:0.62rem;color:var(--text-muted);margin-top:0.15rem}
.dns-node-result{font-family:var(--font-mono);font-size:0.62rem;color:var(--neon-green);margin-top:0.4rem;min-height:0.8rem}
.dns-node.dn-active{border-color:var(--neon-yellow)!important;box-shadow:0 0 15px rgba(255,215,0,0.35)}
.dns-node.dn-done{border-color:var(--neon-green)!important;background:rgba(0,255,136,0.06)}
.dns-arrow-wrap{display:flex;flex-direction:column;align-items:center;justify-content:center;padding-top:1.5rem;gap:0.2rem;min-width:30px}
.dns-arrow{width:24px;height:2px;background:var(--neon-purple);position:relative}
.dns-arrow::after{content:'';position:absolute;right:-4px;top:-4px;border:4px solid transparent;border-left-color:var(--neon-purple)}
.dns-arrow.da-active{background:var(--neon-yellow)}
.dns-arrow.da-active::after{border-left-color:var(--neon-yellow)}
.dns-arrow-label{font-size:0.6rem;color:var(--text-muted);font-family:var(--font-mono)}
.dns-result-final{display:flex;align-items:center;gap:0.8rem;background:rgba(0,255,136,0.07);border:1px solid rgba(0,255,136,0.25);border-radius:10px;padding:0.8rem 1.2rem;font-family:var(--font-mono);font-size:1rem;transition:all 0.5s}
.dfr-domain{color:var(--neon-yellow);font-weight:700}
.dfr-arrow{color:var(--neon-purple);font-size:1.3rem}
#dfr-ip{color:var(--neon-green);font-weight:700;letter-spacing:0.05em;text-shadow:var(--glow-green)}
.dfr-badge{font-size:0.75rem;color:var(--neon-green)}
.typed-domain{min-width:6ch}

/* ═══════════ TCP ════════════════════════════════════════ */
.tcp-sim{display:flex;align-items:stretch;gap:0;margin:0.8rem 0 1rem;min-height:220px}
.tcp-endpoint{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:0.4rem;min-width:95px;padding:1rem;background:rgba(0,0,0,0.25);border:1px solid var(--border);border-radius:12px}
.tcp-ep-icon{font-size:2.2rem}
.tcp-ep-label{font-family:var(--font-mono);font-size:0.7rem;font-weight:700;color:var(--neon-blue)}
.tcp-ep-ip{font-size:0.62rem;color:var(--text-muted);font-family:var(--font-mono)}
.tcp-ep-state{font-family:var(--font-mono);font-size:0.65rem;color:var(--text-muted);margin-top:0.2rem;transition:all 0.3s}
.tcp-ep-state.established{color:var(--neon-green);text-shadow:var(--glow-green)}
.tcp-lane{flex:1;position:relative;display:flex;flex-direction:column;justify-content:space-around;padding:0.5rem 0.8rem;gap:0.3rem}
.tcp-lane-line{position:absolute;left:50%;top:0;bottom:0;width:2px;background:rgba(0,212,255,0.12);transform:translateX(-50%)}
.tcp-pkt-row{display:flex;align-items:center;position:relative;z-index:1;height:52px}
.tcp-pkt-row.reverse{flex-direction:row-reverse}
.tcp-hspacer{flex:1}
.tcp-packet{background:rgba(0,0,0,0.4);border-radius:8px;padding:0.4rem 0.8rem;font-family:var(--font-mono);font-size:0.72rem;text-align:center;opacity:0;transform:translateX(0);transition:none;position:relative;min-width:90px}
.tcp-packet.flying{transition:transform 1.1s cubic-bezier(0.4,0,0.2,1),opacity 0.3s}
.syn-pkt{border:1px solid var(--neon-blue);color:var(--neon-blue);background:rgba(0,212,255,0.12)}
.synack-pkt{border:1px solid var(--neon-purple);color:var(--neon-purple);background:rgba(180,90,255,0.12)}
.ack-pkt{border:1px solid var(--neon-green);color:var(--neon-green);background:rgba(0,255,136,0.12)}
.pkt-label{display:block;font-weight:700;font-size:0.78rem}
.pkt-sub{display:block;font-size:0.6rem;color:var(--text-muted);margin-top:0.1rem}
.tcp-step-label{font-family:var(--font-mono);font-size:0.62rem;color:var(--text-muted);min-width:40px}
.left-label{text-align:left}
.right-label{text-align:right}
.tcp-connected-banner{text-align:center;font-family:var(--font-mono);font-size:0.78rem;font-weight:700;color:var(--neon-green);text-shadow:var(--glow-green);opacity:0;transition:opacity 0.5s;padding:0.4rem;background:rgba(0,255,136,0.07);border:1px solid rgba(0,255,136,0.25);border-radius:6px;margin-top:0.2rem}
.tcp-connected-banner.show{opacity:1}
.tcp-explain-bar{font-family:var(--font-mono);font-size:0.82rem;color:var(--text-secondary);background:rgba(0,0,0,0.3);border:1px solid var(--border);border-left:3px solid var(--neon-blue);border-radius:6px;padding:0.65rem 1rem;transition:all 0.3s}

/* ═══════════ UDP ════════════════════════════════════════ */
.udp-sim-wrap{margin:0.5rem 0 0.5rem}
.udp-road-label{font-family:var(--font-mono);font-size:0.65rem;color:var(--text-muted);letter-spacing:0.1em;margin-bottom:0.4rem}
.udp-road{display:flex;align-items:center;gap:0.8rem;margin-bottom:1rem}
.udp-road-left,.udp-road-right{font-size:1.8rem;min-width:40px;text-align:center}
.udp-road-track{flex:1;height:70px;background:rgba(0,0,0,0.35);border:1px solid var(--border);border-radius:8px;position:relative;overflow:hidden}
.udp-pkt{position:absolute;top:50%;transform:translateY(-50%);width:42px;height:24px;border-radius:5px;display:flex;align-items:center;justify-content:center;font-family:var(--font-mono);font-size:0.55rem;font-weight:700;left:-50px}
.udp-pkt.ok{background:rgba(0,212,255,0.18);border:1px solid var(--neon-blue);color:var(--neon-blue)}
.udp-pkt.drop{background:rgba(255,77,109,0.18);border:1px solid var(--neon-red);color:var(--neon-red)}
.udp-pkt.flying{transition:left 1.1s linear,opacity 0.4s}
.udp-pkt.dropped{transition:left 0.7s linear,top 0.4s ease-in,opacity 0.4s}
.udp-stats-bar{display:grid;grid-template-columns:repeat(4,1fr);gap:0.6rem}
.udp-stat{display:flex;flex-direction:column;align-items:center;background:rgba(0,0,0,0.3);border:1px solid var(--border);border-radius:8px;padding:0.7rem 0.4rem}
.us-val{font-family:var(--font-mono);font-size:1.6rem;font-weight:700}
.udp-stat.blue .us-val{color:var(--neon-blue)}
.udp-stat.green .us-val{color:var(--neon-green)}
.udp-stat.red .us-val{color:var(--neon-red)}
.udp-stat.purple .us-val{color:var(--neon-purple)}
.us-lbl{font-size:0.62rem;color:var(--text-muted);font-family:var(--font-mono);margin-top:0.2rem;text-align:center}

/* ═══════════ HTTP ════════════════════════════════════════ */
.http-sim{display:grid;grid-template-columns:1fr 200px;gap:1.2rem;align-items:start}
.browser-bar{display:flex;align-items:center;gap:0.5rem;background:#111;padding:0.5rem 0.8rem;border-radius:8px 8px 0 0}
.browser-dot{width:10px;height:10px;border-radius:50%}
.browser-dot.r{background:#ff5f57}.browser-dot.y{background:#ffbd2e}.browser-dot.g{background:#28c740}
.browser-url{font-family:var(--font-mono);font-size:0.7rem;color:var(--text-secondary);flex:1;margin-left:0.5rem}
.browser-body{background:rgba(5,10,25,0.9);border:1px solid var(--border);border-top:none;border-radius:0 0 8px 8px;min-height:120px;padding:1rem;display:flex;flex-direction:column;gap:0.5rem;font-size:0.8rem;transition:all 0.4s}
.browser-placeholder{color:var(--text-muted);font-family:var(--font-mono);font-size:0.75rem;margin:auto}
.http-btns{display:flex;flex-wrap:wrap;gap:0.5rem;margin-top:0.7rem}
.http-btn{font-family:var(--font-mono);font-size:0.72rem;font-weight:700;padding:0.45rem 0.9rem;border-radius:7px;cursor:pointer;border:1px solid;background:transparent;transition:all 0.22s}
.b200{color:var(--neon-green);border-color:rgba(0,255,136,0.4)}.b200:hover{background:rgba(0,255,136,0.12);box-shadow:var(--glow-green)}
.b404{color:var(--neon-yellow);border-color:rgba(255,215,0,0.4)}.b404:hover{background:rgba(255,215,0,0.1)}
.b500{color:var(--neon-red);border-color:rgba(255,77,109,0.4)}.b500:hover{background:rgba(255,77,109,0.12);box-shadow:var(--glow-red)}
.bpost{color:var(--neon-purple);border-color:rgba(180,90,255,0.4)}.bpost:hover{background:rgba(180,90,255,0.12)}
.packet-travel{display:flex;align-items:center;justify-content:center;height:80px;position:relative;overflow:hidden}
.pkt-box{font-size:1.8rem;position:absolute}
.server-resp-box{background:rgba(0,0,0,0.3);border:1px solid var(--border);border-radius:10px;padding:1rem;text-align:center;transition:all 0.4s}
.srv-icon{font-size:2rem;margin-bottom:0.3rem}
.srv-code{font-family:var(--font-mono);font-size:1.3rem;font-weight:700;margin-bottom:0.2rem}
.srv-msg{font-size:0.72rem;color:var(--text-secondary)}
.http-raw{display:flex;flex-direction:column;gap:0.6rem}
.raw-req,.raw-res{background:rgba(0,0,0,0.3);border-radius:6px;padding:0.6rem;font-size:0.72rem;color:var(--text-secondary)}
.raw-req{border-left:2px solid var(--neon-blue)}.raw-res{border-left:2px solid var(--neon-green)}
.status-legend{display:flex;flex-wrap:wrap;gap:0.5rem;margin-top:0.8rem}
.sl-item{font-size:0.72rem;font-family:var(--font-mono);padding:0.2rem 0.6rem;border-radius:4px}
.sl-item.green{background:rgba(0,255,136,0.08);color:var(--neon-green)}
.sl-item.yellow{background:rgba(255,215,0,0.08);color:var(--neon-yellow)}
.sl-item.orange{background:rgba(255,149,0,0.08);color:var(--neon-orange)}
.sl-item.red{background:rgba(255,77,109,0.08);color:var(--neon-red)}

/* ═══════════ HTTPS ═══════════════════════════════════════ */
.http-vs-https{display:grid;grid-template-columns:1fr auto 1fr;gap:1rem;align-items:center;margin:1rem 0}
.hvh-vs{font-family:var(--font-mono);font-size:0.9rem;font-weight:700;color:var(--text-muted);text-align:center}
.hvh-card{border-radius:14px;padding:1.3rem;border:1px solid}
.hvh-card.insecure{border-color:rgba(255,77,109,0.3);background:rgba(255,77,109,0.05)}
.hvh-card.secure{border-color:rgba(0,255,136,0.3);background:rgba(0,255,136,0.05)}
.hvh-icon{font-size:2rem;margin-bottom:0.4rem}
.hvh-title{font-weight:700;font-size:1.1rem;margin-bottom:0.2rem}
.insecure .hvh-title{color:var(--neon-red)}.secure .hvh-title{color:var(--neon-green)}
.hvh-sub{font-family:var(--font-mono);font-size:0.68rem;color:var(--text-muted);margin-bottom:0.8rem}
.hvh-list{list-style:none;font-size:0.8rem;color:var(--text-secondary);display:flex;flex-direction:column;gap:0.3rem}
.hvh-list li::before{content:'▸ '}
.insecure .hvh-list li.bad{color:var(--neon-red)!important}
.secure .hvh-list li.good{color:var(--neon-green)!important}
.data-vis{font-family:var(--font-mono);font-size:0.68rem;border-radius:7px;padding:0.6rem;margin-top:0.8rem;display:flex;flex-direction:column;gap:0.2rem}
.insecure-data{background:rgba(255,77,109,0.08);border:1px solid rgba(255,77,109,0.2);color:var(--neon-red)}
.secure-data{background:rgba(0,255,136,0.06);border:1px solid rgba(0,255,136,0.2);color:var(--neon-green)}
.intercept{color:var(--neon-red);font-weight:700;animation:blink 0.8s step-start infinite}
.encrypted{color:var(--neon-green);font-weight:700}

/* ═══════════ TLS ════════════════════════════════════════ */
.tls-analogy{background:rgba(180,90,255,0.07);border:1px solid rgba(180,90,255,0.2);border-radius:8px;padding:0.8rem 1.1rem;font-size:0.85rem;color:var(--text-secondary);margin-bottom:1rem}
.tls-sim{display:grid;grid-template-columns:130px 1fr 130px;gap:0.8rem;align-items:start}
.tls-ep{display:flex;flex-direction:column;align-items:center;gap:0.4rem;background:rgba(0,0,0,0.25);border:1px solid var(--border);border-radius:12px;padding:1rem;text-align:center}
.tls-ep-icon{font-size:2.2rem}
.tls-ep-label{font-family:var(--font-mono);font-size:0.65rem;font-weight:700;color:var(--neon-purple)}
.tls-ep-state{font-family:var(--font-mono);font-size:0.62rem;color:var(--text-muted);margin-top:0.2rem;transition:all 0.3s}
.tls-ep-state.secured{color:var(--neon-green);text-shadow:var(--glow-green)}
.tls-flow{display:flex;flex-direction:column;gap:0.5rem}
.tls-step-row{opacity:0.25;transition:all 0.5s;transform:translateX(-10px)}
.tls-step-row.visible{opacity:1;transform:translateX(0)}
.tls-step-badge{font-family:var(--font-mono);font-size:0.6rem;color:var(--text-muted);letter-spacing:0.1em;margin-bottom:0.25rem}
.tls-msg-box{border-radius:10px;padding:0.8rem 1rem;border:1px solid}
.tls-outgoing{border-color:rgba(0,212,255,0.25);background:rgba(0,212,255,0.06)}
.tls-incoming{border-color:rgba(180,90,255,0.25);background:rgba(180,90,255,0.06)}
.tls-done{border-color:rgba(0,255,136,0.3);background:rgba(0,255,136,0.08)}
.tls-msg-icon{font-size:1.4rem;margin-bottom:0.25rem}
.tls-msg-title{font-family:var(--font-mono);font-size:0.75rem;font-weight:700;color:var(--text-primary);margin-bottom:0.25rem}
.tls-msg-body{font-size:0.75rem;color:var(--text-secondary)}
.tls-final{display:flex;align-items:center;gap:1rem;background:rgba(0,255,136,0.05);border:1px solid rgba(0,255,136,0.2);border-radius:10px;padding:0.8rem 1rem;margin-top:0.3rem;opacity:0;transition:opacity 0.5s}
.tls-final.show{opacity:1}
.tls-lock-big{font-size:2rem}
.tls-encrypted-stream{font-family:var(--font-mono);font-size:0.65rem;color:var(--neon-green);word-break:break-all;letter-spacing:0.05em}

/* ═══════════ PORTS ══════════════════════════════════════ */
.building-wrap{margin:0.8rem 0}
.building-sign{font-family:var(--font-mono);font-size:0.78rem;font-weight:700;color:var(--neon-blue);background:rgba(0,212,255,0.08);border:1px solid rgba(0,212,255,0.2);border-radius:8px;padding:0.55rem 1rem;margin-bottom:0.5rem;display:inline-block}
.building-facade{background:linear-gradient(180deg,rgba(5,12,30,0.95),rgba(2,8,20,0.95));border:1px solid rgba(0,212,255,0.15);border-radius:14px;padding:1.2rem}
.door-group{display:grid;grid-template-columns:repeat(auto-fill,minmax(90px,1fr));gap:0.6rem}
.port-door{border-radius:10px;padding:0.8rem 0.5rem;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:0.2rem;transition:all 0.25s;text-align:center}
.open-door{background:rgba(0,212,255,0.06);border:1px solid rgba(0,212,255,0.2)}
.open-door:hover{transform:scale(1.06);box-shadow:var(--glow-blue)}
.closed-door{background:rgba(255,77,109,0.06);border:1px solid rgba(255,77,109,0.2)}
.closed-door:hover{transform:scale(1.06);box-shadow:var(--glow-red)}
.door-num{font-family:var(--font-mono);font-size:1rem;font-weight:700;color:var(--neon-blue)}
.closed-door .door-num{color:var(--neon-red)}
.door-svc{font-size:0.65rem;color:var(--text-secondary)}
.door-state{font-family:var(--font-mono);font-size:0.55rem;letter-spacing:0.1em;color:var(--neon-green);margin-top:0.2rem}
.closed-door .door-state{color:var(--neon-red)}
.port-door.selected{transform:scale(1.08)}
.port-info-panel{background:rgba(0,0,0,0.3);border:1px solid var(--border);border-radius:10px;padding:0.8rem 1rem;margin-top:0.6rem;font-size:0.82rem;transition:all 0.3s;min-height:50px;display:flex;align-items:center}
.pip-placeholder{color:var(--text-muted);font-size:0.78rem}

/* ═══════════ DHCP ════════════════════════════════════════ */
.dora-sim{display:grid;grid-template-columns:100px 1fr 100px;gap:0.8rem;align-items:center;margin:0.8rem 0}
.dora-device{display:flex;flex-direction:column;align-items:center;gap:0.3rem;text-align:center}
.dora-dev-icon{font-size:2.5rem}
.dora-dev-label{font-family:var(--font-mono);font-size:0.7rem;color:var(--text-secondary)}
.dora-dev-ip{font-family:var(--font-mono);font-size:0.62rem;color:var(--neon-green);min-height:1rem;transition:all 0.4s}
.dora-flow{display:flex;flex-direction:column;gap:0.5rem}
.dora-step{background:rgba(0,0,0,0.3);border:1px solid var(--border);border-radius:10px;padding:0.7rem 0.8rem;display:flex;align-items:flex-start;gap:0.7rem;transition:all 0.45s;opacity:0.4}
.dora-step.active{opacity:1;background:rgba(180,90,255,0.1);border-color:var(--neon-purple);box-shadow:var(--glow-purple)}
.dora-step.done{opacity:1;background:rgba(0,255,136,0.07);border-color:var(--neon-green)}
.dora-letter{font-family:var(--font-mono);font-size:1.4rem;font-weight:700;color:var(--neon-purple);min-width:24px;line-height:1}
.dora-step.done .dora-letter{color:var(--neon-green)}
.dora-word{font-family:var(--font-mono);font-size:0.7rem;font-weight:700;letter-spacing:0.1em;color:var(--text-primary)}
.dora-msg{font-size:0.75rem;color:var(--text-secondary)}
.dora-msg small{color:var(--text-muted);display:block;font-size:0.65rem}
.dora-pkt{font-size:1.2rem;margin-left:auto}
.dhcp-result{display:flex;flex-wrap:wrap;gap:0.6rem;background:rgba(0,255,136,0.05);border:1px solid rgba(0,255,136,0.2);border-radius:8px;padding:0.7rem 1rem;font-family:var(--font-mono);font-size:0.75rem;color:var(--text-secondary);margin-top:0.5rem}
.dhcp-result strong{color:var(--neon-green)}

/* ═══════════ ARP ════════════════════════════════════════ */
.arp-sim{display:grid;grid-template-columns:130px 1fr;gap:1rem;align-items:start;margin:0.8rem 0}
.arp-requester{display:flex;flex-direction:column;align-items:center;gap:0.4rem;background:rgba(0,0,0,0.3);border:1px solid var(--border);border-radius:12px;padding:0.9rem;text-align:center;position:relative}
.arp-dev-icon{font-size:2.2rem}
.arp-dev-label{font-family:var(--font-mono);font-size:0.7rem;font-weight:700;color:var(--neon-blue)}
.arp-dev-ip{font-family:var(--font-mono);font-size:0.62rem;color:var(--text-muted)}
.arp-broadcast-ring{position:absolute;top:50%;left:50%;width:100%;height:100%;border:2px solid var(--neon-yellow);border-radius:50%;transform:translate(-50%,-50%) scale(0);opacity:0;transition:none}
.arp-broadcast-ring.broadcasting{animation:arpRing 1.2s ease-out forwards}
@keyframes arpRing{0%{transform:translate(-50%,-50%) scale(0.5);opacity:0.8;border-color:var(--neon-yellow)}100%{transform:translate(-50%,-50%) scale(2.5);opacity:0;border-color:var(--neon-yellow)}}
.arp-devices{display:flex;flex-direction:column;gap:0.5rem}
.arp-dev{display:flex;align-items:center;gap:0.6rem;background:rgba(0,0,0,0.25);border:1px solid var(--border);border-radius:9px;padding:0.5rem 0.8rem;transition:all 0.4s;font-family:var(--font-mono);font-size:0.72rem;position:relative}
.ad-icon{font-size:1.3rem}
.ad-ip{color:var(--text-secondary);min-width:90px}
.ad-mac{color:var(--text-muted);font-size:0.62rem;flex:1}
.ad-state{font-size:0.72rem;min-width:20px}
.ad-label{font-size:0.58rem;letter-spacing:0.1em;color:var(--neon-purple);position:absolute;top:2px;right:6px}
.arp-dev.broadcasting{border-color:var(--neon-yellow);box-shadow:0 0 15px rgba(255,215,0,0.3);animation:arpPulse 0.6s ease-in-out infinite alternate}
.arp-dev.replying{border-color:var(--neon-green);background:rgba(0,255,136,0.1);box-shadow:var(--glow-green)}
.arp-dev.silent{opacity:0.35}
@keyframes arpPulse{from{box-shadow:0 0 10px rgba(255,215,0,0.3)}to{box-shadow:0 0 25px rgba(255,215,0,0.7)}}
.arp-status-box{background:rgba(0,0,0,0.3);border:1px solid var(--border);border-radius:8px;padding:0.7rem 1rem;font-family:var(--font-mono);font-size:0.8rem;color:var(--text-secondary);transition:all 0.3s}

/* ═══════════ ROUTING ════════════════════════════════════ */
.routing-sim{margin:0.8rem 0}
.route-map{display:flex;align-items:center;flex-wrap:wrap;gap:0;margin-bottom:1rem;position:relative;justify-content:center}
.route-node{display:flex;flex-direction:column;align-items:center;gap:0.15rem;background:rgba(0,0,0,0.35);border:2px solid var(--border);border-radius:12px;padding:0.75rem 0.8rem;min-width:85px;text-align:center;transition:all 0.45s;position:relative}
.route-node.rn-you{border-color:rgba(0,212,255,0.35)}
.route-node.reached{border-color:var(--neon-green)!important;background:rgba(0,255,136,0.1);box-shadow:var(--glow-green)}
.route-node.current{border-color:var(--neon-purple)!important;background:rgba(180,90,255,0.12);box-shadow:var(--glow-purple)}
.rn-icon{font-size:1.6rem}
.rn-label{font-family:var(--font-mono);font-size:0.65rem;font-weight:700;color:var(--text-primary)}
.rn-loc{font-size:0.58rem;color:var(--neon-purple);font-family:var(--font-mono)}
.rn-ip{font-size:0.58rem;color:var(--text-muted);font-family:var(--font-mono)}
.route-line{width:30px;height:2px;background:rgba(180,90,255,0.2);position:relative;flex-shrink:0}
.route-line::after{content:'›';position:absolute;right:-6px;top:-9px;color:rgba(180,90,255,0.4);font-size:1.3rem}
.route-line.active::after{color:var(--neon-purple)}
.route-packet{position:absolute;font-size:1.4rem;transition:none;opacity:0;top:calc(50% - 18px)}
.route-status{font-family:var(--font-mono);font-size:0.8rem;color:var(--text-secondary);background:rgba(0,0,0,0.3);border:1px solid var(--border);border-radius:8px;padding:0.65rem 1rem;margin-bottom:0.6rem;transition:all 0.3s;min-height:40px}
.route-metrics{display:flex;gap:1rem;font-family:var(--font-mono);font-size:0.72rem}
.route-metrics span{background:rgba(0,0,0,0.3);border:1px solid var(--border);border-radius:6px;padding:0.3rem 0.7rem;color:var(--neon-purple)}

/* ═══════════ FIREWALL ════════════════════════════════════ */
.fw-sim{display:grid;grid-template-columns:1fr 120px 1fr;gap:0.8rem;align-items:start;margin:0.8rem 0}
.fw-zone-label,.fz-label{font-family:var(--font-mono);font-size:0.65rem;letter-spacing:0.12em;color:var(--text-muted);margin-bottom:0.5rem}
.fw-packets-list,.fz-packets{display:flex;flex-direction:column;gap:0.4rem;min-height:60px}
.fw-pkt{font-family:var(--font-mono);font-size:0.72rem;font-weight:700;padding:0.38rem 0.75rem;border-radius:6px;opacity:0;transform:translateX(-15px);transition:all 0.35s}
.fw-pkt.show{opacity:1;transform:translateX(0)}
.fw-pkt.fw-allow{background:rgba(0,212,255,0.1);border:1px solid rgba(0,212,255,0.3);color:var(--neon-blue)}
.fw-pkt.fw-deny{background:rgba(255,77,109,0.1);border:1px solid rgba(255,77,109,0.3);color:var(--neon-red)}
.fw-gate-visual{display:flex;flex-direction:column;align-items:center;gap:0.3rem;background:rgba(180,90,255,0.08);border:2px solid rgba(180,90,255,0.3);border-radius:14px;padding:1rem;text-align:center;transition:all 0.3s}
.fw-gate-visual.fw-alert{border-color:var(--neon-red)!important;box-shadow:var(--glow-red);animation:fwShake 0.3s ease}
@keyframes fwShake{0%,100%{transform:translateX(0)}25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}
.fw-shield-large{font-size:2.5rem}
.fw-gate-label{font-family:var(--font-mono);font-size:0.65rem;font-weight:700;color:var(--neon-purple);letter-spacing:0.15em}
.fw-gate-sub{font-size:0.6rem;color:var(--text-muted);font-family:var(--font-mono)}
.fw-zone{border-radius:12px;padding:0.7rem;border:1px solid}
.allowed-zone{border-color:rgba(0,255,136,0.2);background:rgba(0,255,136,0.04)}
.blocked-zone{border-color:rgba(255,77,109,0.2);background:rgba(255,77,109,0.04);margin-top:0.5rem}
.fz-pkt{font-family:var(--font-mono);font-size:0.7rem;font-weight:700;padding:0.3rem 0.6rem;border-radius:5px;margin-bottom:0.3rem;opacity:0;transform:scale(0.8);transition:all 0.3s}
.fz-pkt.show{opacity:1;transform:scale(1)}
.fz-pkt.fa{background:rgba(0,255,136,0.15);border:1px solid rgba(0,255,136,0.3);color:var(--neon-green)}
.fz-pkt.fd{background:rgba(255,77,109,0.15);border:1px solid rgba(255,77,109,0.3);color:var(--neon-red)}
.fw-rules-card{background:rgba(0,0,0,0.25);border:1px solid var(--border);border-radius:14px;padding:1.2rem}
.frc-title{font-size:0.82rem;font-weight:700;color:var(--neon-blue);margin-bottom:0.7rem}
.fw-rule-item{font-size:0.8rem;color:var(--text-secondary);padding:0.3rem 0;border-bottom:1px solid rgba(255,255,255,0.04)}
.fw-rule-item.allow{color:var(--neon-green)}.fw-rule-item.deny{color:var(--neon-red)}

/* ═══════════ SCENARIO ══════════════════════════════════ */
.scenario-timeline{display:flex;flex-direction:column;gap:0;margin:1.2rem 0}
.sc-step{display:flex;gap:1rem;opacity:0.2;transition:all 0.5s;padding:0.8rem 0 0.8rem 0;border-left:2px solid rgba(0,212,255,0.12);padding-left:1.2rem;position:relative}
.sc-step.active,.sc-step.done{opacity:1}
.sc-step.done{border-left-color:var(--neon-green)}
.sc-step.active{border-left-color:var(--neon-blue)}
.sc-num{position:absolute;left:-14px;width:26px;height:26px;border-radius:50%;background:var(--bg-deep);border:2px solid rgba(0,212,255,0.25);display:flex;align-items:center;justify-content:center;font-family:var(--font-mono);font-size:0.7rem;font-weight:700;color:var(--text-muted);top:0.8rem;transition:all 0.4s}
.sc-step.active .sc-num{border-color:var(--neon-blue);color:var(--neon-blue);box-shadow:var(--glow-blue);background:rgba(0,212,255,0.1)}
.sc-step.done .sc-num{border-color:var(--neon-green);color:var(--neon-green);background:rgba(0,255,136,0.1)}
.sc-body{flex:1}
.sc-proto{display:flex;align-items:center;gap:0.5rem;margin-bottom:0.3rem}
.sc-layer{font-family:var(--font-mono);font-size:0.62rem;color:var(--text-muted)}
.sc-title{font-weight:700;font-size:0.95rem;color:var(--text-primary);margin-bottom:0.25rem}
.sc-detail{font-size:0.8rem;color:var(--text-secondary)}

/* ─── OSI REF ─────────────────────────────────────────── */
.osi-ref{margin-top:2rem;border-top:1px solid var(--border);padding-top:1.5rem}
.osi-title{font-family:var(--font-mono);font-size:0.75rem;font-weight:700;letter-spacing:0.15em;color:var(--neon-blue);margin-bottom:0.8rem}
.osi-table{display:flex;flex-direction:column;gap:0.3rem}
.osi-row{display:flex;align-items:center;gap:0.8rem;padding:0.4rem 0.6rem;border-radius:6px;transition:all 0.2s}
.osi-row:hover{background:rgba(255,255,255,0.03)}
.osi-num{font-family:var(--font-mono);font-size:0.8rem;font-weight:700;color:var(--neon-purple);min-width:20px;text-align:center;width:28px;height:28px;border-radius:6px;background:rgba(180,90,255,0.12);border:1px solid rgba(180,90,255,0.25);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.osi-name{font-weight:600;font-size:0.8rem;color:var(--text-primary);min-width:110px}
.osi-proto{font-family:var(--font-mono);font-size:0.7rem;color:var(--text-muted)}

/* ─── OUTRO ──────────────────────────────────────────── */
.outro-trophy{font-size:4rem;margin-bottom:0.5rem}
.outro-days-recap{display:flex;flex-wrap:wrap;gap:1rem;justify-content:center;margin:1.5rem 0}
.odr-day{display:flex;flex-direction:column;align-items:center;gap:0.2rem;background:rgba(0,0,0,0.25);border:1px solid var(--border);border-radius:10px;padding:0.7rem 1.2rem}
.odr-label{font-family:var(--font-mono);font-size:0.65rem;color:var(--neon-blue);letter-spacing:0.15em}
.odr-topics{font-size:0.82rem;color:var(--text-secondary)}
.next-up{font-size:0.9rem;color:var(--text-secondary);margin-top:1rem}
.next-up strong{color:var(--neon-purple)}

/* ─── TOOLTIP ────────────────────────────────────────── */
.tooltip{position:fixed;z-index:800;background:rgba(10,18,40,0.95);border:1px solid var(--border-glow);border-radius:8px;padding:0.5rem 0.9rem;font-size:0.75rem;font-family:var(--font-mono);color:var(--text-primary);pointer-events:none;box-shadow:var(--glow-blue);max-width:200px;transition:opacity 0.15s}
.tooltip.hidden{opacity:0}

/* ═══════════ RESPONSIVE ═══════════════════════════════ */

/* ─── HAMBURGER BUTTON ─── */
.nav-hamburger{display:none;flex-direction:column;justify-content:space-between;width:30px;height:20px;background:transparent;border:none;cursor:pointer;padding:0;margin-left:auto;flex-shrink:0;z-index:201;position:relative}
.nav-hamburger span{display:block;width:100%;height:2px;background:var(--neon-blue);border-radius:2px;transition:transform 0.3s ease,opacity 0.3s ease;transform-origin:center}
.nav-hamburger.open span:nth-child(1){transform:translateY(9px) rotate(45deg)}
.nav-hamburger.open span:nth-child(2){opacity:0;transform:scaleX(0)}
.nav-hamburger.open span:nth-child(3){transform:translateY(-9px) rotate(-45deg)}

/* ─── MEDIUM — 960px ─── */
@media(max-width:960px){
  .scene-section{padding:5rem 1.2rem 3rem}
  .glass-panel{padding:2rem 1.8rem}
  .scene-content{max-width:100%}
  .tls-sim{grid-template-columns:120px 1fr 120px}
  .dora-sim{grid-template-columns:90px 1fr 90px}
  .arp-sim{grid-template-columns:110px 1fr}
  .fw-sim{grid-template-columns:1fr 100px 1fr}
}

/* ─── NAV COLLAPSE — 900px (tablets + small laptops) ─── */
@media(max-width:900px){
  /* Hamburger replaces nav pills */
  #navbar{
    padding:0.55rem 1rem;
    flex-wrap:nowrap;
    justify-content:space-between;
    align-items:center;
  }
  .nav-hamburger{display:flex}
  .nav-pills{display:none}

  /* Expanded drawer */
  #navbar.nav-open{
    height:100vh;
    height:100dvh;
    flex-wrap:wrap;
    align-items:flex-start;
    overflow-y:auto;
    padding-bottom:2rem;
  }
  #navbar.nav-open .nav-logo,
  #navbar.nav-open .nav-hamburger{align-self:center}
  #navbar.nav-open .nav-pills{
    display:flex;
    flex-direction:column;
    align-items:flex-start;
    gap:0.1rem;
    width:100%;
    padding-top:0.5rem;
    border-top:1px solid var(--border);
  }
  /* Day badges as section separators */
  .nav-day{
    display:inline-block!important;
    margin:0.9rem 0 0.2rem;
    font-size:0.63rem;
    letter-spacing:0.15em;
  }
  .nav-day:first-child{margin-top:0.2rem}
  /* Full-width tap targets */
  .nav-link{
    font-size:0.88rem;
    padding:0.55rem 0.8rem;
    border-radius:6px;
    width:100%;
    display:block;
  }
  .nav-link-special{margin-top:0.8rem}
}

/* ─── TABLET — 768px ─── */
@media(max-width:768px){
  .concept-row{grid-template-columns:1fr}
  .http-vs-https{grid-template-columns:1fr;gap:0.8rem}
  .hvh-vs{display:none}
  .tls-sim{grid-template-columns:110px 1fr}
  .tls-ep:last-child{display:none}
  .dora-sim{grid-template-columns:80px 1fr}
  .dora-device:last-child{display:none}
  .intro-days{grid-template-columns:1fr}
}

/* ─── MOBILE — 700px ─── */
@media(max-width:700px){

  /* Sections */
  .scene-section{padding:4.5rem 0.75rem 2.5rem}
  .glass-panel{padding:1.4rem 1.2rem;border-radius:16px}
  .scene-title{font-size:clamp(1.4rem,6vw,2.2rem)}
  h1.scene-title{font-size:clamp(1.6rem,7vw,2.6rem)}

  /* DNS — horizontal scroll */
  .dns-sim-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:0 -0.2rem;padding-bottom:0.3rem}
  .dns-chain{flex-wrap:nowrap;min-width:520px;padding-bottom:0.5rem}
  .dns-node{min-width:80px;padding:0.65rem 0.5rem}
  .dns-arrow-wrap{min-width:22px}

  /* TCP — stack vertically */
  .tcp-sim{flex-direction:column;gap:0.6rem}
  .tcp-endpoint{flex-direction:row;justify-content:center;align-items:center;gap:1rem;min-width:auto;padding:0.6rem 1rem}
  .tcp-ep-icon{font-size:1.8rem}
  .tcp-lane{min-width:auto;width:100%}
  .tcp-lane-line{left:50%;display:block}
  .tcp-pkt-row{height:48px}

  /* UDP */
  .udp-stats-bar{grid-template-columns:repeat(2,1fr)}

  /* HTTP */
  .http-sim{grid-template-columns:1fr;grid-template-rows:auto auto}

  /* HTTPS */
  .http-vs-https{grid-template-columns:1fr;gap:0.8rem}
  .hvh-vs{display:none}

  /* TLS */
  .tls-sim{grid-template-columns:1fr}
  .tls-ep:last-child{display:none}

  /* Ports */
  .door-group{grid-template-columns:repeat(auto-fill,minmax(80px,1fr))}

  /* DHCP */
  .dora-sim{grid-template-columns:1fr}
  .dora-device:last-child{display:none}

  /* ARP */
  .arp-sim{grid-template-columns:1fr}
  .arp-requester{display:none}

  /* Routing — horizontal scroll */
  .routing-sim{overflow-x:auto;-webkit-overflow-scrolling:touch}
  .route-map{flex-wrap:nowrap;justify-content:flex-start;padding:0.5rem 0 1rem;min-width:480px;overflow:visible}
  .route-node{min-width:82px;padding:0.65rem 0.5rem;flex-shrink:0}
  .route-line{width:20px;flex-shrink:0}
  .route-metrics{flex-wrap:wrap;gap:0.4rem}
  .route-metrics span{font-size:0.65rem;padding:0.25rem 0.5rem}

  /* Firewall */
  .fw-sim{grid-template-columns:1fr}
  .fw-gate-visual{padding:0.7rem}
  .fw-incoming{order:1}.fw-gate-visual{order:2}.fw-zones{order:3}

  /* Day dividers */
  .day-divider{padding:2rem 0.75rem}
  .day-div-inner{padding:1rem 1.3rem}
  .day-div-title{font-size:1.1rem}

  /* Intro */
  .scenario-teaser{font-size:0.75rem;gap:0.25rem}
  .intro-days{grid-template-columns:1fr}

  /* OSI table */
  .osi-name{min-width:70px;font-size:0.74rem}
  .osi-proto{font-size:0.63rem}

  /* Buttons — easier tap targets on mobile */
  .btn-secondary{width:100%;justify-content:center;margin-top:1rem}
  .btn-primary{width:100%;justify-content:center}

  /* Terminal */
  .terminal-line{font-size:0.72rem}
  .t-comment{font-size:0.64rem}

  /* Outro */
  .outro-days-recap{gap:0.6rem}
  .outro-trophy{font-size:3rem}
}

/* ─── SMALL MOBILE — 420px ─── */
@media(max-width:420px){
  .glass-panel{padding:1.1rem 0.9rem;border-radius:12px}
  .scene-section{padding:4rem 0.5rem 2rem}

  /* DNS */
  .dns-chain{min-width:440px}
  .dns-node{min-width:70px;padding:0.55rem 0.35rem}
  .dns-node-icon{font-size:1.4rem}
  .dns-node-label{font-size:0.62rem}

  /* TCP */
  .tcp-packet{min-width:75px;padding:0.3rem 0.5rem}
  .pkt-label{font-size:0.68rem}

  /* Routing */
  .route-node{min-width:72px;padding:0.55rem 0.35rem}
  .rn-icon{font-size:1.3rem}
  .rn-label,.rn-loc,.rn-ip{font-size:0.55rem}
  .route-line{width:14px}

  /* Stats */
  .us-val{font-size:1.2rem}
  .us-lbl{font-size:0.58rem}

  /* Ports */
  .door-group{grid-template-columns:repeat(3,1fr)}
  .door-num{font-size:0.85rem}
  .door-svc{font-size:0.6rem}

  /* UDP stats */
  .udp-stats-bar{grid-template-columns:repeat(2,1fr)}

  /* Scenario teaser */
  .scenario-teaser{font-size:0.68rem}
  .arr{font-size:0.85rem}
  .tag{font-size:0.6rem}

  /* Day card */
  .day-card{padding:0.85rem}
  .day-topics{font-size:0.82rem}
}