*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#f8fafc;--bg2:#ffffff;--bg3:#f1f5f9;--card:#ffffff;
  --border:rgba(15,23,42,.08);--bh:rgba(15,23,42,.15);
  --accent:#e29500;--a2:#d97706;--a3:#f59e0b;
  --navy:#0f172a;--navy2:#1e293b;--slate:#475569;
  --teal:#0d9488;--rose:#e11d48;--emerald:#059669;
  --text:#0f172a;--t2:#475569;--t3:#94a3b8;
  --r:12px;--shadow:0 1px 3px rgba(0,0,0,.06),0 4px 16px rgba(0,0,0,.04)
}
html{scroll-behavior:smooth}
body{
  font-family:'Inter',system-ui,-apple-system,sans-serif;
  background:var(--bg);color:var(--text);min-height:100vh;overflow-x:hidden;
  background-image:radial-gradient(circle,rgba(15,23,42,.04) 1px,transparent 1px);
  background-size:24px 24px
}

/* ─── Nav ─── */
.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.85);backdrop-filter:blur(16px);border-bottom:1px solid var(--border)}
.nav-inner{max-width:1200px;margin:0 auto;padding:0 24px;height:60px;display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--navy);font-weight:700;font-size:1.1rem}
.logo svg{width:28px;height:28px}
.logo-setu{color:var(--navy);font-weight:800}
.logo-vision{color:var(--accent);font-weight:700}
.logo-sub{color:var(--t2);font-weight:500;font-size:.85rem;margin-left:2px;padding-left:10px;border-left:1.5px solid var(--border)}
.nav-links{display:flex;align-items:center;gap:8px}

/* ─── Buttons ─── */
.btn{display:inline-flex;align-items:center;gap:6px;padding:10px 22px;border-radius:50px;border:none;cursor:pointer;font:inherit;font-size:.88rem;font-weight:600;transition:all .22s;text-decoration:none}
.btn-primary{background:var(--navy);color:#fff;box-shadow:0 2px 8px rgba(15,23,42,.15)}
.btn-primary:hover{background:var(--navy2);transform:translateY(-1px);box-shadow:0 4px 16px rgba(15,23,42,.22)}
.btn-primary:disabled{opacity:.5;cursor:not-allowed;transform:none}
.btn-accent{background:linear-gradient(135deg,var(--accent),var(--a3));color:#fff;box-shadow:0 2px 12px rgba(226,149,0,.2)}
.btn-accent:hover{transform:translateY(-1px);box-shadow:0 4px 18px rgba(226,149,0,.35)}
.btn-ghost{background:transparent;color:var(--t2);border:1px solid var(--border)}
.btn-ghost:hover{border-color:var(--bh);color:var(--navy);background:var(--bg3)}
.btn-sm{padding:7px 16px;font-size:.8rem}
.btn-run{width:100%;justify-content:center;padding:14px;font-size:.95rem;margin-top:16px;border-radius:var(--r)}

/* ─── Mode Switcher ─── */
.mode-switcher{display:flex;align-items:center;justify-content:center;gap:6px;margin:30px auto 20px;max-width:500px;background:var(--card);padding:6px;border-radius:50px;border:1px solid var(--border);box-shadow:var(--shadow)}
.mode-btn{flex:1;display:flex;align-items:center;justify-content:center;gap:8px;padding:10px 18px;border:none;background:transparent;color:var(--t2);font-weight:600;font-size:.88rem;border-radius:40px;cursor:pointer;transition:all .2s;white-space:nowrap}
.mode-btn svg{width:18px;height:18px;stroke-width:2}
.mode-btn:hover{color:var(--navy);background:var(--bg3)}
.mode-btn.active{background:var(--navy);color:#fff;box-shadow:0 2px 8px rgba(15,23,42,.2)}
.mode-btn.active svg{stroke:#fff}

/* ─── Hero ─── */
.hero{position:relative;padding:70px 24px 50px;text-align:center;overflow:hidden}
.hero-glow{position:absolute;top:-120px;left:50%;transform:translateX(-50%);width:800px;height:500px;background:radial-gradient(ellipse,rgba(226,149,0,.06) 0%,transparent 70%);pointer-events:none}
.hero-glow2{position:absolute;top:-50px;right:-100px;width:400px;height:400px;background:radial-gradient(circle,rgba(13,148,136,.04),transparent 70%);pointer-events:none}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.badge{display:inline-flex;align-items:center;gap:8px;background:var(--card);border:1px solid var(--border);color:var(--t2);border-radius:50px;padding:6px 18px;font-size:.78rem;font-weight:600;margin-bottom:24px;letter-spacing:.03em;box-shadow:var(--shadow)}
.badge-highlight{color:var(--accent);font-weight:700}
h1{font-size:clamp(2.2rem,5.5vw,3.5rem);font-weight:800;color:var(--navy);line-height:1.15;margin-bottom:16px}
h1 .highlight{color:var(--accent)}
.hero-sub{color:var(--t2);font-size:1.05rem;max-width:600px;margin:0 auto 36px;line-height:1.7}

/* ─── Tool Tabs ─── */
.tool-tabs{display:flex;flex-wrap:wrap;justify-content:center;gap:6px;background:var(--bg3);border:1px solid var(--border);border-radius:var(--r);padding:6px;max-width:900px;margin:0 auto}
.tool-tab{padding:8px 16px;border-radius:8px;border:none;background:transparent;color:var(--t2);font:inherit;font-size:.82rem;font-weight:500;cursor:pointer;transition:all .2s;white-space:nowrap;display:inline-flex;align-items:center;gap:6px}
.tool-tab:hover{color:var(--navy);background:rgba(15,23,42,.04)}
.tool-tab.active{background:var(--card);color:var(--navy);font-weight:600;box-shadow:0 1px 4px rgba(0,0,0,.06)}
.tool-tab .tab-icon{width:16px;height:16px;flex-shrink:0;stroke-width:2;color:inherit}
.tool-tab.active .tab-icon{color:var(--accent)}

/* ─── Main ─── */
.main-area{padding-bottom:80px}

/* ─── Upload Card ─── */
.upload-card{background:var(--card);border:1px solid var(--border);border-radius:var(--r);margin-bottom:24px;overflow:hidden;box-shadow:var(--shadow)}
.drop-zone{padding:40px 24px;text-align:center;cursor:pointer;transition:background .2s}
.drop-zone.drag-over{background:rgba(226,149,0,.04)}
.drop-icon{margin-bottom:14px;display:flex;justify-content:center}
.drop-icon svg{width:48px;height:48px;color:var(--t3);stroke-width:1.5}
.drop-title{font-size:1rem;font-weight:600;margin-bottom:6px;color:var(--navy)}
.drop-sub{color:var(--t3);font-size:.84rem;margin-bottom:20px}
.preview-strip{display:flex;align-items:center;gap:16px;padding:14px 24px;border-top:1px solid var(--border);background:var(--bg3)}
.preview-strip img{width:64px;height:64px;object-fit:cover;border-radius:8px;border:1px solid var(--border)}
.preview-meta{flex:1;font-size:.82rem;color:var(--t2);line-height:1.7}
.preview-meta strong{color:var(--navy)}

/* ─── Panels ─── */
.tool-panel{display:none}
.tool-panel.active{display:block}
.panel-header{margin-bottom:12px;display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.panel-header .panel-icon{width:28px;height:28px;padding:5px;border-radius:8px;flex-shrink:0}
.panel-header .panel-icon.purple{background:rgba(139,92,246,.1);color:#8b5cf6}
.panel-header .panel-icon.blue{background:rgba(59,130,246,.1);color:#3b82f6}
.panel-header .panel-icon.teal{background:rgba(13,148,136,.1);color:#0d9488}
.panel-header .panel-icon.rose{background:rgba(225,29,72,.1);color:#e11d48}
.panel-header .panel-icon.amber{background:rgba(226,149,0,.1);color:#e29500}
.panel-header .panel-icon.green{background:rgba(5,150,105,.1);color:#059669}
.panel-header .panel-icon.slate{background:rgba(71,85,105,.1);color:#475569}
.panel-header .panel-icon svg{width:18px;height:18px;stroke-width:2}
.panel-header-text h2{font-size:1.25rem;font-weight:700;margin-bottom:2px;color:var(--navy)}
.panel-header-text p{color:var(--t2);font-size:.88rem}

/* ─── Learn Box ─── */
.learn-box{background:var(--card);border:1px solid var(--border);border-radius:var(--r);padding:18px 20px;margin-bottom:16px;font-size:.86rem;line-height:1.8;color:var(--t2);box-shadow:var(--shadow)}
.learn-box strong{color:var(--navy)}
.learn-box code{background:rgba(226,149,0,.08);padding:2px 6px;border-radius:4px;font-size:.82rem;color:var(--a2)}

/* ─── Controls ─── */
.ctrl{display:flex;flex-wrap:wrap;gap:16px;align-items:center;background:var(--card);border:1px solid var(--border);border-radius:var(--r);padding:16px 20px;box-shadow:var(--shadow)}
.ctrl label{display:flex;align-items:center;gap:8px;font-size:.84rem;color:var(--t2);font-weight:500;white-space:nowrap}
.ctrl select,.ctrl input[type="number"]{background:var(--bg3);border:1px solid var(--border);color:var(--navy);border-radius:8px;padding:6px 12px;font:inherit;font-size:.84rem;outline:none;transition:border-color .2s}
.ctrl select:focus,.ctrl input[type="number"]:focus{border-color:var(--accent)}
.ctrl input[type="range"]{accent-color:var(--accent);width:100px}
.input-sm{width:80px}

/* ─── Results ─── */
.result-area{margin-top:20px}
.loading{display:flex;align-items:center;justify-content:center;gap:12px;padding:36px;color:var(--t2);background:var(--card);border:1px solid var(--border);border-radius:var(--r);box-shadow:var(--shadow)}
.spinner{width:24px;height:24px;border-radius:50%;border:3px solid var(--border);border-top-color:var(--accent);animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ─── Pixel Grid ─── */
.pixel-grid-wrap{overflow:auto;border-radius:var(--r);border:1px solid var(--border);background:var(--bg3);padding:8px}
.pixel-grid{display:inline-grid;gap:1px}
.pixel-cell{display:flex;flex-direction:column;align-items:center;justify-content:center;border-radius:3px;font-size:.55rem;font-weight:700;line-height:1.2;min-width:52px;min-height:52px;font-family:'Courier New',monospace}

/* ─── Image Comparison ─── */
.img-compare{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:16px}
.img-compare.single{grid-template-columns:1fr}
.img-box{border-radius:var(--r);overflow:hidden;border:1px solid var(--border);background:var(--bg3);box-shadow:var(--shadow)}
.img-box img{display:block;width:100%;height:auto;max-height:400px;object-fit:contain}
.img-box .label{padding:8px 14px;font-size:.75rem;font-weight:600;color:var(--t3);text-transform:uppercase;letter-spacing:.06em;border-top:1px solid var(--border);background:var(--card)}

/* ─── Channel Grid ─── */
.channel-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}

/* ─── Aug Grid ─── */
.aug-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px}
.aug-card{border-radius:var(--r);overflow:hidden;border:1px solid var(--border);background:var(--card);transition:transform .15s;box-shadow:var(--shadow)}
.aug-card:hover{transform:scale(1.02)}
.aug-card img{width:100%;aspect-ratio:1;object-fit:cover}
.aug-card .label{padding:8px 12px;font-size:.78rem;font-weight:600;color:var(--t2);text-align:center;border-top:1px solid var(--border)}

/* ─── Histogram Canvas ─── */
.hist-wrap{background:var(--card);border:1px solid var(--border);border-radius:var(--r);padding:16px;margin-bottom:16px;box-shadow:var(--shadow)}
.hist-wrap canvas{width:100%;height:200px;border-radius:8px}

/* ─── Annotation Studio ─── */
.anno-workspace{display:grid;grid-template-columns:1fr 320px;gap:16px}
.anno-canvas-wrap{position:relative;background:repeating-conic-gradient(var(--bg3) 0% 25%,var(--bg2) 0% 50%) 0 0/20px 20px;border-radius:var(--r);overflow:hidden;border:1px solid var(--border);box-shadow:var(--shadow)}
.anno-canvas-wrap canvas{display:block;max-width:100%;cursor:crosshair}
.anno-sidebar{display:flex;flex-direction:column;gap:12px}
.anno-list{flex:1;overflow-y:auto;max-height:400px;background:var(--card);border:1px solid var(--border);border-radius:var(--r);padding:12px;box-shadow:var(--shadow)}
.anno-item{display:flex;align-items:center;gap:8px;padding:6px 8px;border-radius:6px;font-size:.8rem;margin-bottom:4px;background:var(--bg3)}
.anno-item .color-dot{width:12px;height:12px;border-radius:50%}
.anno-item .delete-btn{margin-left:auto;cursor:pointer;color:var(--rose);font-size:.9rem;background:none;border:none}
.export-box{background:var(--card);border:1px solid var(--border);border-radius:var(--r);padding:12px;box-shadow:var(--shadow)}
.export-box textarea{width:100%;height:120px;background:var(--bg3);border:1px solid var(--border);color:var(--navy);border-radius:8px;padding:10px;font-family:monospace;font-size:.78rem;resize:vertical}

/* ─── Learn Box ─── */
.learn-box{background:rgba(226,149,0,.04);border-left:4px solid var(--accent);padding:14px 18px;border-radius:4px 8px 8px 4px;margin-bottom:20px;font-size:.88rem;line-height:1.5;color:var(--t2);position:relative}
.learn-box::before{content:'💡 Learning Concept';display:flex;align-items:center;gap:6px;font-weight:700;font-size:.72rem;text-transform:uppercase;letter-spacing:.05em;color:var(--a2);margin-bottom:6px}
.learn-box strong{color:var(--navy);font-weight:600}
.learn-box code{background:var(--bg2);padding:2px 5px;border-radius:4px;color:var(--rose);font-size:.85em;border:1px solid var(--border)}

/* ─── Info Note ─── */
.info-note{background:rgba(226,149,0,.06);border:1px solid rgba(226,149,0,.15);color:var(--a2);border-radius:var(--r);padding:10px 14px;font-size:.84rem;margin-bottom:8px}

/* ─── Stats ─── */
.stat-row{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:16px}
.stat-pill{background:var(--card);border:1px solid var(--border);border-radius:50px;padding:7px 16px;font-size:.82rem;color:var(--t2);box-shadow:var(--shadow)}
.stat-pill.green{border-color:rgba(5,150,105,.25);color:var(--emerald)}

/* ─── Kernel Editor ─── */
.kernel-grid{display:inline-grid;gap:4px;margin:10px 0}
.kernel-grid input{width:52px;height:36px;text-align:center;background:var(--bg3);border:1px solid var(--border);color:var(--navy);border-radius:6px;font:inherit;font-size:.85rem;font-weight:600}

/* ─── Toast ─── */
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(16px);background:var(--card);border:1px solid var(--border);color:var(--navy);padding:10px 22px;border-radius:50px;font-size:.85rem;font-weight:500;opacity:0;transition:all .3s;z-index:999;white-space:nowrap;box-shadow:0 4px 24px rgba(0,0,0,.1)}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ─── Footer ─── */
.footer{border-top:1px solid var(--border);padding:28px 24px;text-align:center;color:var(--t3);font-size:.82rem}
.footer a{color:var(--accent);text-decoration:none;font-weight:500}
.footer a:hover{text-decoration:underline}
.footer-sub{margin-top:6px;font-size:.75rem}

/* ─── Responsive ─── */
@media(max-width:768px){
  .hero{padding:40px 16px 30px}
  .hero-glow, .hero-glow2{max-width:100%}
  .img-compare{grid-template-columns:1fr}
  .anno-workspace{grid-template-columns:1fr}
  .channel-grid{grid-template-columns:1fr 1fr}
  .aug-grid{grid-template-columns:1fr 1fr}
  .ctrl{flex-direction:column;align-items:stretch}
  .ctrl label{width:100%; display:flex; flex-direction:column; gap:4px}
  .ctrl label input, .ctrl label select{width:100%}
  .tool-tabs{max-width:100%; padding:4px}
  .tool-tab{padding:8px 10px; font-size:.78rem}
  .nav-inner{padding:0 12px}
  .nav-links{gap:4px}
  .nav-links .btn-sm{padding:6px 8px;font-size:.7rem}
  .logo-sub{display:none}
  .mode-switcher{flex-direction:column; border-radius:12px; gap:4px; margin-top:20px; padding:8px}
  .mode-btn{width:100%; border-radius:8px; padding:12px}
  h1{font-size:2rem}
  .hero-sub{font-size:.95rem; margin-bottom:20px}
}