:root{--bg-base: #0f172a;--bg-surface: #1e293b;--bg-card: rgba(255, 255, 255, .05);--bg-card-hover: rgba(255, 255, 255, .09);--primary: #6366f1;--primary-light: #818cf8;--primary-dark: #4338ca;--primary-glow: rgba(99, 102, 241, .25);--success: #10b981;--success-glow: rgba(16, 185, 129, .25);--danger: #f43f5e;--danger-glow: rgba(244, 63, 94, .25);--bass-color: #3b82f6;--bass-glow: rgba(59, 130, 246, .25);--drums-color: #f59e0b;--drums-glow: rgba(245, 158, 11, .25);--other-color: #10b981;--other-glow: rgba(16, 185, 129, .25);--vocals-color: #e11d48;--vocals-glow: rgba(225, 29, 72, .25);--text-primary: #f8fafc;--text-secondary: #cbd5e1;--text-muted: #64748b;--border: rgba(255, 255, 255, .1);--border-focus: #818cf8;--font-body: "Kanit", "Prompt", "Outfit", system-ui, sans-serif;--font-display: "Outfit", "Kanit", system-ui, sans-serif;--r-sm: 8px;--r-md: 14px;--r-lg: 20px;--r-xl: 28px;--r-full: 9999px;--t-fast: .15s ease;--t-med: .25s cubic-bezier(.16, 1, .3, 1);--t-slow: .4s cubic-bezier(.16, 1, .3, 1)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font-body);background:var(--bg-base);color:var(--text-primary);min-height:100vh;-webkit-font-smoothing:antialiased;overflow-x:hidden;line-height:1.6}body:before{content:"";position:fixed;top:0;right:0;bottom:0;left:0;background:radial-gradient(ellipse 60% 40% at 20% 0%,rgba(99,102,241,.12) 0%,transparent 70%),radial-gradient(ellipse 50% 35% at 80% 100%,rgba(59,130,246,.1) 0%,transparent 70%);pointer-events:none;z-index:0}.app{min-height:100vh;display:flex;flex-direction:column;position:relative;z-index:1}.main-content{flex:1;padding:2rem 1.5rem 4rem;max-width:1100px;margin:0 auto;width:100%}.navbar{display:flex;align-items:center;justify-content:space-between;padding:1rem 2rem;background:#0f172ad9;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-bottom:1px solid var(--border);box-shadow:0 4px 20px #00000040;position:sticky;top:0;z-index:100}.navbar-brand{display:flex;align-items:center;gap:.75rem}.brand-icon{font-size:1.6rem}.brand-name{font-family:var(--font-display);font-size:1.5rem;font-weight:800;letter-spacing:-.5px;color:var(--text-primary)}.navbar-links{display:flex;gap:.5rem}.nav-link{display:flex;align-items:center;gap:.5rem;text-decoration:none;padding:.5rem 1.15rem;border-radius:var(--r-full);font-size:.9rem;font-weight:600;color:var(--text-secondary);background:#ffffff0a;border:1px solid var(--border);transition:all var(--t-fast)}.nav-link:hover{color:#fff;background:#ffffff1a;border-color:#fff3}.nav-link.active{background:var(--primary);color:#fff;border-color:var(--primary-light);box-shadow:0 4px 14px var(--primary-glow)}.page-header{text-align:center;margin-bottom:2rem}.page-title{font-family:var(--font-display);font-size:clamp(2rem,5vw,3rem);font-weight:900;letter-spacing:-1px;line-height:1.1;margin-bottom:.5rem;color:var(--text-primary)}.page-subtitle{color:var(--text-secondary);font-size:.95rem}.card{background:#1e293bb3;border:1px solid var(--border);border-radius:var(--r-lg);padding:1.75rem;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);box-shadow:0 8px 30px #0003}.card-title{font-family:var(--font-display);font-size:1.15rem;font-weight:700;color:var(--text-primary);display:flex;align-items:center;gap:.5rem;margin-bottom:1.25rem}.stems-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1.25rem;margin:2rem 0}@media (min-width: 640px){.stems-grid{grid-template-columns:repeat(4,1fr)}}.stem-card{background:#1e293b99;border:2px solid var(--border);border-radius:var(--r-lg);padding:1.75rem 1rem;display:flex;flex-direction:column;align-items:center;gap:.875rem;cursor:pointer;transition:all var(--t-med);position:relative;overflow:hidden;-webkit-user-select:none;user-select:none}.stem-card:hover{transform:translateY(-3px);border-color:var(--stem-color);box-shadow:0 8px 20px #00000040}.stem-card.unmuted{border-color:var(--stem-color);background:#1e293bf2;box-shadow:0 6px 24px #0000004d,0 0 0 1px var(--stem-color)}.stem-card.disabled{opacity:.4;cursor:not-allowed}.stem-card.disabled:hover{transform:none}.stem-icon{font-size:2.5rem;position:relative;z-index:1;transition:transform var(--t-med)}.stem-card.unmuted .stem-icon{transform:scale(1.15)}.stem-label{font-family:var(--font-display);font-size:1rem;font-weight:700;position:relative;z-index:1;color:var(--text-primary)}.stem-badge{font-size:.75rem;font-weight:700;padding:.25rem .75rem;border-radius:var(--r-full);position:relative;z-index:1;transition:all var(--t-fast)}.stem-badge.on{background:#10b98133;color:#34d399;border:1px solid rgba(16,185,129,.3)}.stem-badge.off{background:#64748b33;color:var(--text-muted);border:1px solid rgba(100,116,139,.3)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.7rem 1.5rem;border-radius:var(--r-md);font-family:var(--font-body);font-size:.95rem;font-weight:700;cursor:pointer;border:none;outline:none;text-decoration:none;transition:all var(--t-fast);white-space:nowrap}.btn:hover:not(:disabled){transform:translateY(-1px)}.btn:active:not(:disabled){transform:translateY(1px)}.btn:disabled{opacity:.45;cursor:not-allowed;transform:none!important}.btn-primary{background:var(--primary);color:#fff;box-shadow:0 4px 14px var(--primary-glow)}.btn-primary:hover:not(:disabled){background:var(--primary-light);box-shadow:0 6px 20px var(--primary-glow)}.btn-secondary{background:#ffffff14;color:var(--text-secondary);border:1px solid var(--border)}.btn-secondary:hover:not(:disabled){background:#ffffff1f;color:#fff;border-color:#fff3}.btn-success{background:var(--success);color:#052614;box-shadow:0 4px 14px var(--success-glow)}.btn-success:hover:not(:disabled){background:#34d399;box-shadow:0 6px 20px var(--success-glow)}.btn-danger{background:#f43f5e26;color:#fb7185;border:1px solid rgba(244,63,94,.3)}.btn-danger:hover:not(:disabled){background:var(--danger);color:#fff}.btn-lg{padding:.875rem 2rem;font-size:1.05rem;border-radius:var(--r-lg)}.btn-sm{padding:.4rem .875rem;font-size:.85rem;border-radius:var(--r-sm)}.w-full{width:100%}.form-group{margin-bottom:1.125rem}.form-label{display:block;font-size:.85rem;font-weight:600;color:var(--text-secondary);margin-bottom:.5rem}.form-input,.form-select{width:100%;padding:.75rem 1rem;background:#0f172ab3;border:1px solid var(--border);border-radius:var(--r-md);color:var(--text-primary);font-family:var(--font-body);font-size:.95rem;transition:all var(--t-fast);outline:none;-webkit-appearance:none;-moz-appearance:none;appearance:none}.form-input:focus,.form-select:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px #6366f140;background:#0f172ae6}.form-input::placeholder{color:var(--text-muted)}.form-row{display:flex;gap:1rem}.form-row>.form-group{flex:1}.progress-wrap{height:8px;background:#ffffff14;border-radius:var(--r-full);overflow:hidden}.progress-fill{height:100%;width:100%;background:linear-gradient(90deg,#6366f1,#3b82f6);border-radius:var(--r-full);transform-origin:left center;will-change:transform;transition:transform .2s linear}.alert{padding:.75rem 1rem;border-radius:var(--r-md);font-size:.875rem;margin-bottom:1rem}.alert-error{background:#f43f5e26;border:1px solid rgba(244,63,94,.3);color:#fb7185}.alert-success{background:#10b98126;border:1px solid rgba(16,185,129,.3);color:#34d399}@keyframes spin{to{transform:rotate(360deg)}}@keyframes pulseGlow{0%,to{box-shadow:0 4px 18px #10b98133}50%{box-shadow:0 4px 28px #10b98166}}.spinner{width:1.5rem;height:1.5rem;border:2px solid rgba(255,255,255,.2);border-top-color:var(--primary-light);border-radius:50%;animation:spin .8s linear infinite}.spinner-sm{width:1rem;height:1rem;border-width:2px}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#ffffff26;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#ffffff40}.vinyl-container{display:flex;justify-content:center;align-items:center;margin-bottom:1.5rem}.vinyl-disc{width:120px;height:120px;border-radius:50%;background:radial-gradient(circle,#334155,#0f172a 70%,#020617);border:4px solid rgba(255,255,255,.1);box-shadow:0 10px 25px #00000080,inset 0 0 0 12px #ffffff0d;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}.vinyl-disc.playing{animation:spin 6s linear infinite}.vinyl-cover-blur{width:100%;height:100%;object-fit:cover;filter:blur(12px) brightness(.6);transform:scale(1.2)}.vinyl-center-hole{position:absolute;width:24px;height:24px;border-radius:50%;background:#0f172a;border:3px solid rgba(255,255,255,.2);z-index:2}.album-cover-revealed{width:160px;height:160px;border-radius:16px;overflow:hidden;margin:0 auto 1.25rem;box-shadow:0 12px 32px #0006,0 0 0 2px #ffffff26;transition:transform .3s ease}.album-cover-revealed:hover{transform:scale(1.04)}