/* ============================================================
   AI COMMAND HUB — Professional Design System
   Layout: Fixed left sidebar (VS Code / Notion style) + content panel
   ============================================================ */

:root{
  /* Base palette */
  --bg-app:#0a0d14;
  --bg-sidebar:#0d1117;
  --bg-panel:#10141d;
  --bg-card:#161b26;
  --bg-card-hover:#1a2030;
  --bg-input:#0a0d14;
  --bg-code:#06080d;

  --border:#1e2530;
  --border-light:#2a3242;
  --border-focus:#3b82f6;

  --text-primary:#f0f2f5;
  --text-secondary:#9aa4b8;
  --text-muted:#5d6678;
  --text-disabled:#3a4150;

  --success:#22c55e;
  --warning:#f59e0b;
  --danger:#ef4444;

  /* Platform accent — swapped via [data-platform] on body */
  --accent:#d97757;
  --accent-2:#f0a875;
  --accent-soft:rgba(217,119,87,.12);
  --accent-glow:rgba(217,119,87,.35);

  --radius-sm:6px;
  --radius-md:10px;
  --radius-lg:16px;

  --sidebar-w:280px;
  --topbar-h:56px;

  --shadow-sm:0 1px 2px rgba(0,0,0,.3);
  --shadow-md:0 4px 16px rgba(0,0,0,.35);
  --shadow-lg:0 12px 32px rgba(0,0,0,.45);

  --font-ui:'Inter','Segoe UI',-apple-system,sans-serif;
  --font-mono:'JetBrains Mono','Fira Code','Courier New',monospace;
}

body[data-platform="claude"]{
  --accent:#d97757; --accent-2:#f0a875; --accent-soft:rgba(217,119,87,.12); --accent-glow:rgba(217,119,87,.35);
}
body[data-platform="chatgpt"]{
  --accent:#10a37f; --accent-2:#34d399; --accent-soft:rgba(16,163,127,.12); --accent-glow:rgba(16,163,127,.35);
}
body[data-platform="gemini"]{
  --accent:#4285f4; --accent-2:#9b72cb; --accent-soft:rgba(66,133,244,.12); --accent-glow:rgba(66,133,244,.35);
}

*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  background:var(--bg-app);
  color:var(--text-primary);
  font-family:var(--font-ui);
  font-size:14px;
  line-height:1.6;
  overflow:hidden;
}

::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--border-light);border-radius:10px}
::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}

/* ============================================================
   APP SHELL
   ============================================================ */
.app-shell{
  display:grid;
  grid-template-columns:var(--sidebar-w) 1fr;
  grid-template-rows:var(--topbar-h) 1fr;
  grid-template-areas:
    "sidebar topbar"
    "sidebar main";
  height:100vh;
  transition:grid-template-columns .25s ease;
}
.app-shell.sidebar-collapsed{
  grid-template-columns:64px 1fr;
}

/* ============================================================
   SIDEBAR
   ============================================================ */
.sidebar{
  grid-area:sidebar;
  background:var(--bg-sidebar);
  border-right:1px solid var(--border);
  display:flex;
  flex-direction:column;
  overflow:hidden;
}

.sidebar-header{
  padding:1rem 1.1rem;
  display:flex;
  align-items:center;
  gap:.7rem;
  border-bottom:1px solid var(--border);
  height:var(--topbar-h);
  flex-shrink:0;
}
.brand-mark{
  width:30px;height:30px;border-radius:8px;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  display:flex;align-items:center;justify-content:center;
  font-size:16px;flex-shrink:0;
  transition:background .3s;
}
.brand-text{
  font-weight:800;font-size:.92rem;
  white-space:nowrap;overflow:hidden;
  letter-spacing:-.01em;
}
.sidebar-collapsed .brand-text{display:none}

.sidebar-collapse-btn{
  margin-left:auto;
  width:26px;height:26px;
  border-radius:6px;
  background:transparent;
  border:1px solid transparent;
  color:var(--text-muted);
  cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  transition:all .15s;
  flex-shrink:0;
}
.sidebar-collapse-btn:hover{background:var(--bg-card);color:var(--text-primary);border-color:var(--border)}
.sidebar-collapsed .sidebar-collapse-btn{margin-left:0}

/* ── Platform switcher ── */
.platform-switcher{
  padding:.9rem .8rem;
  display:flex;
  flex-direction:column;
  gap:.4rem;
  border-bottom:1px solid var(--border);
}
.sidebar-collapsed .platform-switcher{padding:.9rem .5rem}

.platform-btn{
  display:flex;
  align-items:center;
  gap:.65rem;
  padding:.6rem .7rem;
  border-radius:var(--radius-md);
  border:1px solid transparent;
  background:transparent;
  color:var(--text-secondary);
  cursor:pointer;
  text-align:left;
  width:100%;
  transition:all .15s;
  position:relative;
}
.platform-btn:hover{background:var(--bg-card);color:var(--text-primary)}
.platform-btn.active{
  background:var(--accent-soft);
  border-color:var(--accent);
  color:var(--text-primary);
}
.platform-btn .p-icon{
  width:26px;height:26px;border-radius:7px;
  display:flex;align-items:center;justify-content:center;
  font-size:14px;flex-shrink:0;
  background:var(--bg-card);
}
.platform-btn.active .p-icon{background:var(--accent)}
.platform-btn .p-text{display:flex;flex-direction:column;min-width:0;flex:1}
.platform-btn .p-name{font-weight:700;font-size:.85rem;white-space:nowrap}
.platform-btn .p-sub{font-size:.7rem;color:var(--text-muted);white-space:nowrap}
.platform-btn .p-count{
  font-size:.68rem;font-weight:700;
  background:var(--bg-card);
  color:var(--text-muted);
  padding:.15rem .45rem;
  border-radius:20px;
  flex-shrink:0;
}
.platform-btn.active .p-count{background:var(--accent);color:#fff}
.sidebar-collapsed .platform-btn .p-text,
.sidebar-collapsed .platform-btn .p-count{display:none}
.sidebar-collapsed .platform-btn{justify-content:center;padding:.6rem}

/* ── Category nav ── */
.sidebar-nav{
  flex:1;
  overflow-y:auto;
  padding:.7rem .6rem;
}
.sidebar-collapsed .sidebar-nav{display:none}

.nav-section-label{
  font-size:.68rem;
  font-weight:700;
  text-transform:uppercase;
  letter-spacing:.07em;
  color:var(--text-muted);
  padding:.5rem .6rem .4rem;
}

.nav-item{
  display:flex;
  align-items:center;
  gap:.65rem;
  padding:.55rem .7rem;
  border-radius:var(--radius-sm);
  color:var(--text-secondary);
  cursor:pointer;
  font-size:.85rem;
  font-weight:600;
  transition:all .13s;
  margin-bottom:.1rem;
  position:relative;
}
.nav-item:hover{background:var(--bg-card);color:var(--text-primary)}
.nav-item.active{
  background:var(--accent-soft);
  color:var(--text-primary);
}
.nav-item.active::before{
  content:'';
  position:absolute;left:-6px;top:50%;transform:translateY(-50%);
  width:3px;height:18px;
  background:var(--accent);
  border-radius:0 3px 3px 0;
}
.nav-item .n-icon{width:18px;text-align:center;flex-shrink:0;font-size:.9rem}
.nav-item .n-label{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.nav-item .n-count{
  font-size:.68rem;font-weight:700;
  color:var(--text-muted);
  background:rgba(255,255,255,.04);
  padding:.1rem .4rem;
  border-radius:20px;
}
.nav-item.active .n-count{background:var(--accent);color:#fff}

.sidebar-footer{
  padding:.8rem 1rem;
  border-top:1px solid var(--border);
  font-size:.72rem;
  color:var(--text-muted);
  flex-shrink:0;
}
.sidebar-collapsed .sidebar-footer{display:none}

/* ============================================================
   TOPBAR
   ============================================================ */
.topbar{
  grid-area:topbar;
  background:var(--bg-panel);
  border-bottom:1px solid var(--border);
  display:flex;
  align-items:center;
  gap:1rem;
  padding:0 1.5rem;
}
.topbar-breadcrumb{
  display:flex;
  align-items:center;
  gap:.5rem;
  font-size:.82rem;
  color:var(--text-muted);
  white-space:nowrap;
}
.topbar-breadcrumb .crumb-current{color:var(--text-primary);font-weight:700}
.topbar-breadcrumb .crumb-sep{color:var(--text-disabled)}

.topbar-search{
  flex:1;
  max-width:480px;
  margin-left:auto;
  position:relative;
}
.topbar-search input{
  width:100%;
  padding:.5rem .9rem .5rem 2.3rem;
  background:var(--bg-input);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  color:var(--text-primary);
  font-size:.83rem;
  outline:none;
  transition:all .15s;
}
.topbar-search input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.topbar-search input::placeholder{color:var(--text-muted)}
.topbar-search .ts-icon{
  position:absolute;left:.8rem;top:50%;transform:translateY(-50%);
  color:var(--text-muted);font-size:.85rem;pointer-events:none;
}
.topbar-search .ts-kbd{
  position:absolute;right:.6rem;top:50%;transform:translateY(-50%);
  font-size:.68rem;color:var(--text-muted);
  background:var(--bg-card);border:1px solid var(--border);
  padding:.1rem .4rem;border-radius:4px;
}

.topbar-actions{display:flex;align-items:center;gap:.5rem}
.icon-btn{
  width:32px;height:32px;border-radius:var(--radius-sm);
  background:transparent;border:1px solid transparent;
  color:var(--text-secondary);cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  transition:all .15s;
}
.icon-btn:hover{background:var(--bg-card);border-color:var(--border);color:var(--text-primary)}

/* ============================================================
   MAIN CONTENT
   ============================================================ */
.main-content{
  grid-area:main;
  overflow-y:auto;
  background:var(--bg-app);
}

.content-inner{
  max-width:1180px;
  margin:0 auto;
  padding:1.75rem 2rem 4rem;
}

/* ── Platform banner ── */
.platform-banner{
  background:linear-gradient(135deg,var(--accent-soft),transparent);
  border:1px solid var(--border);
  border-radius:var(--radius-lg);
  padding:1.3rem 1.6rem;
  margin-bottom:1.5rem;
  display:flex;
  align-items:flex-start;
  gap:1rem;
}
.platform-banner .pb-icon{
  width:44px;height:44px;border-radius:12px;
  background:var(--accent);
  display:flex;align-items:center;justify-content:center;
  font-size:22px;flex-shrink:0;
  box-shadow:0 6px 18px -4px var(--accent-glow);
}
.platform-banner .pb-text{flex:1}
.platform-banner h2{font-size:1.1rem;font-weight:800;margin-bottom:.3rem}
.platform-banner p{font-size:.85rem;color:var(--text-secondary);line-height:1.6}
.platform-banner p b{color:var(--text-primary)}

/* ── Stats row ── */
.stats-row{
  display:flex;
  gap:.8rem;
  margin-bottom:1.5rem;
  flex-wrap:wrap;
}
.stat-chip{
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  padding:.65rem 1.1rem;
  display:flex;
  align-items:center;
  gap:.5rem;
  font-size:.8rem;
  color:var(--text-secondary);
}
.stat-chip b{color:var(--accent);font-size:.95rem;transition:color .3s}

/* ── Category header ── */
.category-header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  margin-bottom:1.2rem;
  flex-wrap:wrap;
  gap:.8rem;
}
.category-header h1{
  font-size:1.4rem;
  font-weight:800;
  display:flex;
  align-items:center;
  gap:.6rem;
}
.category-header .cat-icon{font-size:1.3rem}
.category-header .cat-meta{
  font-size:.8rem;color:var(--text-muted);font-weight:500;
}

.view-toggle{
  display:flex;
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  padding:.2rem;
}
.view-toggle button{
  padding:.35rem .7rem;
  border-radius:5px;
  border:none;
  background:transparent;
  color:var(--text-muted);
  font-size:.78rem;
  font-weight:600;
  cursor:pointer;
  transition:all .15s;
}
.view-toggle button.active{background:var(--accent);color:#fff}

/* ============================================================
   COMMAND CARDS
   ============================================================ */
.command-grid{
  display:flex;
  flex-direction:column;
  gap:.85rem;
}

.cmd-card{
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius-lg);
  overflow:hidden;
  transition:border-color .2s,box-shadow .2s;
}
.cmd-card:hover{border-color:var(--border-light)}
.cmd-card.open{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent-soft)}

.cmd-head{
  padding:1rem 1.25rem;
  display:flex;
  align-items:center;
  gap:1rem;
  cursor:pointer;
  user-select:none;
}
.cmd-head:hover{background:var(--bg-card-hover)}

.cmd-num{
  width:26px;height:26px;border-radius:7px;
  background:var(--bg-app);
  border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;
  font-size:.68rem;font-weight:700;color:var(--text-muted);
  flex-shrink:0;
}

.cmd-code-wrap{
  display:flex;
  align-items:center;
  gap:.4rem;
  flex-shrink:0;
}

.cmd-code{
  font-family:var(--font-mono);
  font-weight:700;
  font-size:.88rem;
  color:var(--success);
  background:var(--bg-code);
  padding:.3rem .7rem;
  border-radius:6px;
  border:1px solid rgba(34,197,94,.25);
  white-space:nowrap;
  flex-shrink:0;
}

.cmd-copy-btn{
  width:28px;height:28px;
  border-radius:6px;
  background:var(--bg-app);
  border:1px solid var(--border);
  color:var(--text-muted);
  cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  font-size:.78rem;
  flex-shrink:0;
  transition:all .15s;
}
.cmd-copy-btn:hover{
  background:var(--accent);
  border-color:var(--accent);
  color:#fff;
}
.cmd-copy-btn.copied{
  background:var(--success);
  border-color:var(--success);
  color:#000;
}
.cmd-copy-btn.copied::after{
  content:'✓';
}
.cmd-copy-btn:not(.copied)::after{
  content:'⎘';
}

.cmd-info{flex:1;min-width:0}
.cmd-title{font-size:.88rem;font-weight:600;color:var(--text-primary);line-height:1.4}

.cmd-difficulty{
  display:flex;gap:2px;flex-shrink:0;
}
.cmd-difficulty span{width:4px;height:12px;border-radius:2px;background:var(--border-light)}
.cmd-difficulty span.filled{background:var(--accent)}

.cmd-chevron{
  color:var(--text-muted);
  transition:transform .2s;
  flex-shrink:0;
  font-size:.8rem;
}
.cmd-card.open .cmd-chevron{transform:rotate(180deg);color:var(--accent)}

.cmd-body{max-height:0;overflow:hidden;transition:max-height .3s ease}
.cmd-card.open .cmd-body{max-height:1500px}
.cmd-body-inner{
  padding:0 1.25rem 1.25rem;
  display:flex;
  flex-direction:column;
  gap:1rem;
  border-top:1px solid var(--border);
  padding-top:1rem;
  margin-top:0;
}

.why-box{
  background:var(--accent-soft);
  border-left:3px solid var(--accent);
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  padding:.8rem 1rem;
  font-size:.82rem;
  color:var(--text-secondary);
  line-height:1.6;
}
.why-box b{color:var(--text-primary)}
.why-label{
  font-size:.68rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;
  color:var(--accent);margin-bottom:.3rem;display:block;
}

.prompt-box{
  background:var(--bg-code);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  overflow:hidden;
}
.prompt-label-row{
  display:flex;justify-content:space-between;align-items:center;
  padding:.55rem .9rem;
  background:rgba(255,255,255,.02);
  border-bottom:1px solid var(--border);
  font-size:.7rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);
}
.copy-btn{
  background:var(--bg-card);border:1px solid var(--border);
  color:var(--text-secondary);font-size:.72rem;
  padding:.3rem .75rem;border-radius:6px;cursor:pointer;
  transition:all .15s;display:flex;align-items:center;gap:.35rem;font-weight:600;
}
.copy-btn:hover{background:var(--success);border-color:var(--success);color:#000}
.copy-btn.copied{background:var(--success);border-color:var(--success);color:#000}
.prompt-text{
  padding:1rem;
  font-family:var(--font-mono);
  font-size:.8rem;
  line-height:1.7;
  color:#c9d1e0;
  white-space:pre-wrap;
  word-break:break-word;
}
.prompt-trigger-line{
  color:var(--success);
  font-weight:700;
}

.tag-row{display:flex;gap:.4rem;flex-wrap:wrap}
.mini-tag{
  font-size:.68rem;font-weight:600;
  padding:.2rem .55rem;border-radius:5px;
  background:var(--bg-app);
  border:1px solid var(--border);
  color:var(--text-muted);
}

/* ============================================================
   EMPTY / NO RESULTS
   ============================================================ */
.empty-state{
  text-align:center;
  padding:4rem 2rem;
  color:var(--text-muted);
}
.empty-state .es-icon{font-size:2.5rem;margin-bottom:1rem;opacity:.5}
.empty-state h3{color:var(--text-secondary);margin-bottom:.4rem;font-size:1rem}

/* ============================================================
   TOAST
   ============================================================ */
.toast{
  position:fixed;bottom:1.5rem;right:1.5rem;
  background:var(--success);color:#000;
  padding:.7rem 1.2rem;border-radius:var(--radius-md);
  font-weight:700;font-size:.83rem;
  box-shadow:var(--shadow-lg);
  transform:translateY(120px);opacity:0;
  transition:all .35s cubic-bezier(.68,-.55,.265,1.55);
  z-index:999;
  display:flex;align-items:center;gap:.5rem;
}
.toast.show{transform:translateY(0);opacity:1}

/* ============================================================
   COMMAND PALETTE (Cmd+K)
   ============================================================ */
.cmdk-overlay{
  position:fixed;inset:0;
  background:rgba(5,7,12,.7);
  backdrop-filter:blur(4px);
  display:none;
  align-items:flex-start;
  justify-content:center;
  padding-top:12vh;
  z-index:1000;
}
.cmdk-overlay.show{display:flex}
.cmdk-box{
  width:90%;max-width:640px;
  background:var(--bg-panel);
  border:1px solid var(--border-light);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow-lg);
  overflow:hidden;
}
.cmdk-input-row{
  display:flex;align-items:center;gap:.7rem;
  padding:.9rem 1.1rem;
  border-bottom:1px solid var(--border);
}
.cmdk-input-row input{
  flex:1;background:transparent;border:none;outline:none;
  color:var(--text-primary);font-size:.95rem;
}
.cmdk-results{max-height:55vh;overflow-y:auto;padding:.5rem}
.cmdk-item{
  display:flex;align-items:center;gap:.7rem;
  padding:.65rem .8rem;border-radius:var(--radius-sm);
  cursor:pointer;
}
.cmdk-item:hover,.cmdk-item.active{background:var(--bg-card)}
.cmdk-item .ck-code{font-family:var(--font-mono);color:var(--success);font-size:.8rem;font-weight:700;flex-shrink:0}
.cmdk-item .ck-title{font-size:.8rem;color:var(--text-secondary);flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.cmdk-item .ck-platform{font-size:.68rem;color:var(--text-muted);flex-shrink:0}

/* ============================================================
   MOBILE
   ============================================================ */
.mobile-topbar-toggle{display:none}

@media(max-width:900px){
  .app-shell{
    grid-template-columns:1fr;
    grid-template-areas:"topbar" "main";
  }
  .sidebar{
    position:fixed;top:0;left:0;bottom:0;
    width:280px;z-index:100;
    transform:translateX(-100%);
    transition:transform .25s;
    box-shadow:var(--shadow-lg);
  }
  .sidebar.mobile-open{transform:translateX(0)}
  .app-shell.sidebar-collapsed .sidebar{width:280px}
  .mobile-topbar-toggle{
    display:flex;width:32px;height:32px;border-radius:var(--radius-sm);
    background:transparent;border:1px solid var(--border);color:var(--text-secondary);
    align-items:center;justify-content:center;cursor:pointer;flex-shrink:0;
  }
  .topbar-breadcrumb{display:none}
  .content-inner{padding:1.25rem 1rem 3rem}
  .cmd-head{flex-wrap:wrap}
}

@media(max-width:600px){
  .topbar-search{max-width:none}
  .topbar-search .ts-kbd{display:none}
}