/* ==========================================================================
   P3P3 SCALPING ACADEMY — Apple/Disney Inspired Design System
   ========================================================================== */

:root {
  /* Background Palette */
  --bg-body: #09090b;
  --bg-sidebar: #0f0f13;
  --bg-surface: rgba(255,255,255,0.03);
  --bg-card: rgba(255,255,255,0.04);
  --bg-card-hover: rgba(255,255,255,0.07);
  --bg-glass: rgba(255,255,255,0.05);
  --bg-input: rgba(255,255,255,0.06);

  /* Border */
  --border: rgba(255,255,255,0.06);
  --border-hover: rgba(255,255,255,0.12);
  --border-active: rgba(99,102,241,0.4);

  /* Text */
  --text-primary: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-muted: #52525b;
  --text-inverse: #09090b;

  /* Accent Gradient */
  --accent-start: #818cf8;
  --accent-end: #6366f1;
  --accent: #818cf8;
  --accent-glow: rgba(99,102,241,0.15);

  /* Semantic */
  --green: #34d399;
  --green-bg: rgba(52,211,153,0.08);
  --red: #fb7185;
  --red-bg: rgba(251,113,133,0.08);
  --yellow: #fbbf24;
  --yellow-bg: rgba(251,191,36,0.08);
  --cyan: #22d3ee;
  --cyan-bg: rgba(34,211,238,0.08);

  /* Typography */
  --font: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  /* Layout */
  --sidebar-w: 280px;
  --header-h: 64px;
  --content-max: 840px;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-xs: 6px;
}

/* Reset */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg-body);color:var(--text-primary);line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden}

/* Scrollbar */
::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--text-muted);border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}

/* ==========================================================================
   LAYOUT
   ========================================================================== */
.app{display:flex;min-height:100vh}

/* Overlay for mobile sidebar */
.sidebar-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,0.6);backdrop-filter:blur(4px);z-index:99;opacity:0;transition:opacity .3s}
.sidebar-overlay.visible{display:block;opacity:1}

/* ==========================================================================
   SIDEBAR
   ========================================================================== */
.sidebar{
  width:var(--sidebar-w);position:fixed;top:0;bottom:0;left:0;z-index:100;
  background:var(--bg-sidebar);border-right:1px solid var(--border);
  display:flex;flex-direction:column;transition:transform .35s cubic-bezier(.4,0,.2,1);
}

.sidebar__head{
  height:var(--header-h);padding:0 20px;display:flex;align-items:center;
  justify-content:space-between;border-bottom:1px solid var(--border);
}
.sidebar__logo{font-size:1.1rem;font-weight:800;letter-spacing:-.5px}
.sidebar__logo em{font-style:normal;background:linear-gradient(135deg,var(--accent-start),var(--accent-end));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.sidebar__close{display:none;background:0;border:0;color:var(--text-secondary);cursor:pointer;padding:4px}
.sidebar__close:hover{color:var(--text-primary)}

/* Progress */
.progress{padding:16px 20px;border-bottom:1px solid var(--border)}
.progress__row{display:flex;justify-content:space-between;font-size:.75rem;font-weight:600;color:var(--text-muted);margin-bottom:6px}
.progress__bar{height:4px;background:var(--bg-input);border-radius:2px;overflow:hidden}
.progress__fill{height:100%;background:linear-gradient(90deg,var(--accent-start),var(--green));border-radius:2px;transition:width .4s ease;width:0}

/* Nav */
.sidebar__nav{flex:1;overflow-y:auto;padding:12px 10px}
.sidebar__nav::-webkit-scrollbar{width:4px}
.nav-list{list-style:none}

.nav-item{
  display:flex;align-items:center;gap:12px;padding:10px 14px;
  border-radius:var(--radius-sm);cursor:pointer;
  transition:all .2s;border:1px solid transparent;margin-bottom:2px;
}
.nav-item:hover{background:var(--bg-card)}
.nav-item.active{background:var(--accent-glow);border-color:var(--border-active)}

/* Status dot */
.nav-dot{
  width:8px;height:8px;border-radius:50%;flex-shrink:0;
  border:2px solid var(--text-muted);background:transparent;transition:all .25s;
}
.nav-item.active .nav-dot{border-color:var(--accent);background:var(--accent);box-shadow:0 0 8px var(--accent-glow)}
.nav-item.completed .nav-dot{border-color:var(--green);background:var(--green)}

.nav-label{display:flex;flex-direction:column}
.nav-num{font-size:.65rem;font-weight:700;text-transform:uppercase;letter-spacing:.5px;color:var(--text-muted)}
.nav-item.active .nav-num{color:var(--accent)}
.nav-item.completed .nav-num{color:var(--green)}
.nav-name{font-size:.88rem;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:180px}

.sidebar__foot{padding:14px 20px;border-top:1px solid var(--border)}
.sidebar__foot a{font-size:.78rem;color:var(--text-muted);text-decoration:none;display:flex;align-items:center;gap:6px;transition:color .2s}
.sidebar__foot a:hover{color:var(--accent)}

/* ==========================================================================
   MAIN
   ========================================================================== */
.main{flex:1;margin-left:var(--sidebar-w);display:flex;flex-direction:column;min-height:100vh}

/* Header */
.header{
  height:var(--header-h);padding:0 32px;display:flex;align-items:center;gap:16px;
  border-bottom:1px solid var(--border);background:rgba(9,9,11,.85);
  backdrop-filter:blur(16px);position:sticky;top:0;z-index:50;
}
.header__burger{display:none;background:0;border:0;color:var(--text-primary);cursor:pointer;padding:4px}
.header__info{flex:1}
.header__tag{font-size:.6rem;font-weight:700;text-transform:uppercase;letter-spacing:1.5px;color:var(--accent)}
.header__title{font-size:1rem;font-weight:700}

/* ==========================================================================
   LESSON CONTENT
   ========================================================================== */
.content{flex:1;padding:40px 32px;max-width:var(--content-max);width:100%;margin:0 auto}

.lesson{display:none;animation:fadeUp .35s ease}
.lesson.active{display:block}
@keyframes fadeUp{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}

/* Lesson Header */
.lesson__head{margin-bottom:36px;padding-bottom:28px;border-bottom:1px solid var(--border)}
.lesson__num{font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:1.5px;color:var(--accent);margin-bottom:6px;display:inline-block}
.lesson__h2{font-size:1.85rem;font-weight:800;line-height:1.2;margin-bottom:12px;letter-spacing:-.5px}
.lesson__meta{display:flex;gap:16px;font-size:.8rem;color:var(--text-muted)}
.lesson__meta svg{vertical-align:middle;margin-right:4px}

/* Typography */
.lesson p{margin-bottom:20px;font-size:1.02rem;color:var(--text-secondary);font-weight:400}
.lesson p.lead{font-size:1.15rem;color:var(--text-primary);font-weight:450;line-height:1.75}
.lesson strong{color:var(--text-primary)}

.lesson h3{
  font-size:1.25rem;font-weight:700;color:var(--text-primary);
  margin:40px 0 16px;padding-left:14px;
  border-left:3px solid var(--accent);
}
.lesson h4{font-size:1.05rem;font-weight:600;margin:24px 0 10px;color:var(--text-primary)}

.lesson ul,.lesson ol{margin-bottom:20px;padding-left:20px}
.lesson li{margin-bottom:8px;font-size:1.02rem;color:var(--text-secondary)}
.lesson li strong{color:var(--text-primary)}

.lesson blockquote{
  border-left:3px solid var(--text-muted);padding:14px 18px;margin:24px 0;
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  background:var(--bg-card);font-style:italic;color:var(--text-secondary);
}

.lesson hr{border:0;border-top:1px solid var(--border);margin:40px 0}

/* Highlight Box */
.highlight-box{
  background:var(--yellow-bg);border-left:3px solid var(--yellow);
  padding:16px 18px;border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  margin:24px 0;font-weight:500;color:var(--text-primary);font-size:.98rem;
}

/* ==========================================================================
   ALERTS / CALLOUTS
   ========================================================================== */
.callout{
  display:flex;gap:14px;padding:18px 20px;border-radius:var(--radius);
  margin:28px 0;border:1px solid transparent;font-size:.95rem;
}
.callout__icon{font-size:1.3rem;line-height:1;flex-shrink:0;margin-top:2px}
.callout__body{flex:1;color:var(--text-secondary)}
.callout__body strong{color:var(--text-primary)}
.callout__body ul{margin-top:8px;margin-bottom:0}

.callout--info{background:var(--cyan-bg);border-color:rgba(34,211,238,.12)}
.callout--warn{background:var(--yellow-bg);border-color:rgba(251,191,36,.12)}
.callout--danger{background:var(--red-bg);border-color:rgba(251,113,133,.12)}
.callout--tip{background:var(--green-bg);border-color:rgba(52,211,153,.12)}

/* ==========================================================================
   GRID & CARDS
   ========================================================================== */
.grid{display:grid;gap:16px;margin:28px 0}
.grid--2{grid-template-columns:repeat(2,1fr)}
.grid--3{grid-template-columns:repeat(3,1fr)}

.card{
  background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);
  padding:22px;transition:all .25s;
}
.card:hover{background:var(--bg-card-hover);border-color:var(--border-hover);transform:translateY(-2px)}
.card h4{margin-top:0!important;margin-bottom:8px}
.card p{font-size:.93rem!important;margin-bottom:0!important}
.card--red:hover{border-color:rgba(251,113,133,.2);box-shadow:0 4px 20px rgba(251,113,133,.05)}
.card--green:hover{border-color:rgba(52,211,153,.2)}

/* ==========================================================================
   TABLES
   ========================================================================== */
.tbl-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius);margin:28px 0;background:var(--bg-card)}
table{width:100%;border-collapse:collapse;font-size:.92rem}
th,td{padding:12px 16px;border-bottom:1px solid var(--border);text-align:left}
th{background:rgba(0,0,0,.2);color:var(--text-muted);font-weight:600;text-transform:uppercase;font-size:.72rem;letter-spacing:.5px}
tr:last-child td{border-bottom:0}
tbody tr:hover{background:rgba(255,255,255,.01)}
.row-red{background:var(--red-bg)}
.row-yellow{background:var(--yellow-bg)}

kbd{
  font-family:var(--font-mono);background:var(--bg-body);border:1px solid var(--border-hover);
  color:var(--text-primary);border-radius:4px;padding:2px 7px;font-size:.82rem;
  box-shadow:0 2px 0 rgba(0,0,0,.4);
}

/* ==========================================================================
   VIDEO THUMBNAIL CARD
   ========================================================================== */
.yt-card{
  display:block;position:relative;border-radius:var(--radius);overflow:hidden;
  margin:28px 0;border:1px solid var(--border);text-decoration:none;
  background:#000;aspect-ratio:16/9;transition:all .3s;
}
.yt-card:hover{border-color:var(--border-hover);transform:translateY(-2px);box-shadow:0 8px 30px rgba(0,0,0,.4)}
.yt-card img{width:100%;height:100%;object-fit:cover;opacity:.7;transition:opacity .3s}
.yt-card:hover img{opacity:.5}
.yt-card__play{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
}
.yt-card__play svg{width:68px;height:68px;filter:drop-shadow(0 2px 8px rgba(0,0,0,.6));transition:transform .2s}
.yt-card:hover .yt-card__play svg{transform:scale(1.1)}
.yt-card__label{
  position:absolute;bottom:0;left:0;right:0;padding:16px 20px;
  background:linear-gradient(transparent,rgba(0,0,0,.85));
  font-size:.9rem;font-weight:600;color:#fff;
}
.video-cap{font-size:.78rem;color:var(--text-muted);text-align:center;margin-top:8px}

/* ==========================================================================
   INTERACTIVE KEYBOARD WIDGET
   ========================================================================== */
.kb-widget{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:28px;margin:28px 0}
.kb-row{display:flex;justify-content:center;gap:10px;margin-bottom:10px}

.kb-key{
  background:var(--bg-body);border:1px solid var(--border-hover);border-radius:var(--radius-sm);
  padding:12px 16px;min-width:68px;text-align:center;font-family:var(--font-mono);
  font-size:1rem;font-weight:700;cursor:pointer;user-select:none;
  transition:all .15s;box-shadow:0 3px 0 rgba(0,0,0,.4);position:relative;
}
.kb-key:hover{transform:translateY(1px);box-shadow:0 2px 0 rgba(0,0,0,.4);border-color:var(--accent)}
.kb-key:active,.kb-key.active{
  transform:translateY(3px);box-shadow:none;
  background:var(--accent-glow);border-color:var(--accent);color:var(--accent);
}
.kb-key small{display:block;font-family:var(--font);font-size:.55rem;font-weight:500;color:var(--text-muted);margin-top:3px;text-transform:uppercase}
.kb-key--danger{border-color:rgba(251,113,133,.2)}
.kb-key--danger:hover{border-color:var(--red)}
.kb-key--danger:active,.kb-key--danger.active{background:var(--red-bg);border-color:var(--red);color:var(--red)}
.kb-key--warn{border-color:rgba(251,191,36,.2)}
.kb-key--warn:hover{border-color:var(--yellow)}
.kb-key--warn:active,.kb-key--warn.active{background:var(--yellow-bg);border-color:var(--yellow);color:var(--yellow)}
.kb-key--wide{min-width:240px}
.kb-key--mod{font-size:.85rem;min-width:82px}
.kb-info{
  margin-top:20px;background:rgba(0,0,0,.2);border:1px solid var(--border);
  border-radius:var(--radius-sm);padding:14px 18px;font-size:.93rem;
  color:var(--text-muted);min-height:60px;display:flex;align-items:center;justify-content:center;text-align:center;
}

/* ==========================================================================
   CALCULATOR WIDGET
   ========================================================================== */
.calc{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:28px;margin:28px 0}
.calc__inputs{display:flex;gap:16px;align-items:flex-end;padding-bottom:20px;margin-bottom:20px;border-bottom:1px solid var(--border)}
.calc__field{display:flex;flex-direction:column;flex:1}
.calc__field label{font-size:.72rem;font-weight:600;color:var(--text-muted);margin-bottom:6px;text-transform:uppercase;letter-spacing:.5px}
.calc__field input{
  background:var(--bg-input);border:1px solid var(--border-hover);border-radius:var(--radius-sm);
  padding:10px 14px;color:var(--text-primary);font-size:1rem;font-weight:600;font-family:var(--font-mono);
  transition:border-color .2s;
}
.calc__field input:focus{outline:0;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}
.calc__results h4{font-size:1rem;font-weight:700;margin-bottom:14px}
.calc .tbl-wrap{margin:0;max-height:380px;overflow-y:auto}

/* ==========================================================================
   CHECKLIST
   ========================================================================== */
.checklist{display:flex;flex-direction:column;gap:10px;margin:24px 0}
.check{
  display:flex;align-items:flex-start;gap:12px;cursor:pointer;user-select:none;
  background:var(--bg-card);border:1px solid var(--border);padding:14px 18px;
  border-radius:var(--radius-sm);transition:all .2s;
}
.check:hover{background:var(--bg-card-hover);border-color:var(--border-hover)}
.check input{display:none}
.check__box{
  width:18px;height:18px;border:2px solid var(--text-muted);border-radius:4px;
  flex-shrink:0;position:relative;transition:all .2s;margin-top:1px;
}
.check input:checked+.check__box{border-color:var(--green);background:var(--green)}
.check__box::after{
  content:'';position:absolute;width:5px;height:8px;border:solid #fff;
  border-width:0 2px 2px 0;transform:rotate(45deg);top:2px;left:5px;opacity:0;transition:opacity .15s;
}
.check input:checked+.check__box::after{opacity:1}
.check__text{font-size:.93rem;font-weight:500;transition:all .2s}
.check input:checked~.check__text{color:var(--text-muted);text-decoration:line-through}

/* ==========================================================================
   FOOTER BUTTONS
   ========================================================================== */
.lesson__foot{border-top:1px solid var(--border);padding-top:28px;margin-top:52px;display:flex;justify-content:space-between;align-items:center;gap:12px}

.btn{
  display:inline-flex;align-items:center;justify-content:center;padding:10px 22px;
  font-family:var(--font);font-size:.92rem;font-weight:600;border-radius:var(--radius-sm);
  border:1px solid transparent;cursor:pointer;transition:all .2s;text-decoration:none;
}
.btn--primary{background:linear-gradient(135deg,var(--accent-start),var(--accent-end));color:#fff;box-shadow:0 4px 14px rgba(99,102,241,.25)}
.btn--primary:hover{transform:translateY(-1px);box-shadow:0 6px 20px rgba(99,102,241,.3)}
.btn--ghost{border-color:var(--border-hover);color:var(--text-secondary);background:0}
.btn--ghost:hover{color:var(--text-primary);background:var(--bg-card)}
.btn--green{background:var(--green);color:var(--text-inverse);box-shadow:0 4px 14px rgba(52,211,153,.2)}
.btn--green:hover{transform:translateY(-1px)}
.btn.disabled{opacity:.35;cursor:not-allowed;transform:none!important;box-shadow:none!important}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media(max-width:1024px){
  .sidebar{transform:translateX(-100%)}
  .sidebar.open{transform:translateX(0);box-shadow:0 0 40px rgba(0,0,0,.5)}
  .sidebar__close{display:block}
  .main{margin-left:0}
  .header__burger{display:block}
  .content{padding:24px 20px}
}

@media(max-width:768px){
  .grid--2,.grid--3{grid-template-columns:1fr}
  .calc__inputs{flex-direction:column}
  .lesson__foot{flex-direction:column}
  .btn{width:100%}
  .lesson__h2{font-size:1.5rem}
  .kb-key{min-width:50px;font-size:.85rem;padding:10px 8px}
  .kb-key--wide{min-width:140px}
  .kb-key--mod{min-width:68px}
  .header{padding:0 16px}
}

/* Channel cards */
.channel-card{display:flex;align-items:flex-start;gap:14px;text-decoration:none;color:inherit;transition:transform .2s,box-shadow .2s}
.channel-card:hover{transform:translateY(-3px);box-shadow:0 8px 24px rgba(0,0,0,.25)}
.channel-card__avatar{flex-shrink:0;width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.8rem;color:#fff;letter-spacing:.03em}
.channel-card__info{flex:1;min-width:0}
.channel-card__info strong{display:block;font-size:.95rem;margin-bottom:4px;color:var(--text)}
.channel-card__info span{font-size:.8rem;color:var(--text-muted);line-height:1.4}
.channel-card__arrow{flex-shrink:0;font-size:1.1rem;color:var(--text-muted);margin-top:2px;transition:color .2s}
.channel-card:hover .channel-card__arrow{color:var(--cyan)}

/* Wide gradient channel cards (Lesson 11) */
.channels-list{display:flex;flex-direction:column;gap:12px}
.channel-card-wide{position:relative;display:flex;align-items:center;gap:16px;padding:16px 20px;border-radius:14px;text-decoration:none;color:var(--text);overflow:hidden;border:1px solid rgba(255,255,255,.06);transition:transform .2s,box-shadow .2s}
.channel-card-wide:hover{transform:translateY(-2px);box-shadow:0 8px 28px rgba(0,0,0,.3)}
.channel-card-wide__bg{position:absolute;inset:0;background:linear-gradient(135deg,var(--g1),var(--g2));opacity:.12;transition:opacity .2s;z-index:0}
.channel-card-wide:hover .channel-card-wide__bg{opacity:.22}
.channel-card-wide__avatar{position:relative;z-index:1;flex-shrink:0;width:52px;height:52px;border-radius:13px;background:linear-gradient(135deg,var(--g1),var(--g2));display:flex;align-items:center;justify-content:center;font-weight:800;font-size:.85rem;color:#fff;letter-spacing:.02em;box-shadow:0 4px 12px rgba(0,0,0,.3)}
.channel-card-wide__info{position:relative;z-index:1;flex:1;min-width:0}
.channel-card-wide__info strong{display:block;font-size:1rem;font-weight:700;margin-bottom:3px;color:var(--text)}
.channel-card-wide__info span{font-size:.83rem;color:var(--text-muted);line-height:1.45}
.channel-card-wide__arrow{position:relative;z-index:1;flex-shrink:0;font-size:1.2rem;color:var(--text-muted);transition:color .2s,transform .2s}
.channel-card-wide:hover .channel-card-wide__arrow{color:var(--cyan);transform:translate(2px,-2px)}

/* Sidebar footer multi-link */
.sidebar__foot{display:flex;flex-direction:column;gap:0}
.sidebar__foot a{display:block;padding:10px 20px;font-size:.8rem;color:var(--text-muted);text-decoration:none;border-top:1px solid rgba(255,255,255,.06);transition:color .2s}
.sidebar__foot a:hover{color:var(--text)}