/* ============================================================
   MusicGen Studio — Styles
   Premium dark-themed SaaS UI
   ============================================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ---------- Custom Properties ---------- */
:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-card: rgba(255,255,255,0.03);
  --bg-card-hover: rgba(255,255,255,0.06);
  --bg-input: rgba(255,255,255,0.05);
  --border: rgba(255,255,255,0.08);
  --border-hover: rgba(255,255,255,0.15);
  --text-primary: #f0f0f0;
  --text-secondary: #a0a0a0;
  --text-muted: #606060;
  --purple: #8B5CF6;
  --cyan: #06B6D4;
  --gradient: linear-gradient(135deg, var(--purple), var(--cyan));
  --gradient-subtle: linear-gradient(135deg, rgba(139,92,246,0.15), rgba(6,182,212,0.15));
  --green: #22C55E;
  --yellow: #EAB308;
  --red: #EF4444;
  --blue: #3B82F6;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --font: 'Inter', -apple-system, sans-serif;
  --mono: 'JetBrains Mono', monospace;
  --nav-h: 64px;
  --transition: 0.2s cubic-bezier(0.4,0,0.2,1);
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;-webkit-font-smoothing:antialiased;scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg-primary);color:var(--text-primary);min-height:100vh;overflow-x:hidden;line-height:1.6}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,textarea,select{font-family:inherit;color:inherit;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px 14px;font-size:0.9rem;outline:none;transition:border var(--transition)}
input:focus,textarea:focus,select:focus{border-color:var(--purple)}
select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23a0a0a0' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:32px}
textarea{resize:vertical;min-height:100px}
::selection{background:var(--purple);color:#fff}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:rgba(255,255,255,0.1);border-radius:3px}

/* ---------- Utility ---------- */
.mono{font-family:var(--mono)}
.gradient-text{background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}

/* ---------- Layout ---------- */
#app{display:flex;flex-direction:column;min-height:100vh}

/* ---------- Nav ---------- */
.nav{position:sticky;top:0;z-index:100;height:var(--nav-h);display:flex;align-items:center;justify-content:space-between;padding:0 24px;background:rgba(10,10,10,0.85);backdrop-filter:blur(20px);border-bottom:1px solid var(--border)}
.nav-brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.1rem}
.nav-brand svg{width:28px;height:28px}
.nav-links{display:flex;gap:4px}
.nav-links a{padding:8px 16px;border-radius:var(--radius-sm);font-size:0.85rem;font-weight:500;color:var(--text-secondary);transition:all var(--transition);position:relative}
.nav-links a:hover{color:var(--text-primary);background:rgba(255,255,255,0.05)}
.nav-links a.active{color:var(--text-primary);background:var(--gradient-subtle)}
.nav-links a.active::after{content:'';position:absolute;bottom:-1px;left:50%;transform:translateX(-50%);width:20px;height:2px;background:var(--gradient);border-radius:1px}
.mobile-menu-btn{display:none;padding:8px;border-radius:var(--radius-sm)}
.mobile-menu-btn svg{width:24px;height:24px;stroke:var(--text-secondary)}

@media(max-width:768px){
  .nav-links{position:fixed;top:var(--nav-h);left:0;right:0;background:rgba(10,10,10,0.95);backdrop-filter:blur(20px);flex-direction:column;padding:8px;border-bottom:1px solid var(--border);transform:translateY(-110%);transition:transform 0.3s ease;z-index:99}
  .nav-links.open{transform:translateY(0)}
  .nav-links a{padding:12px 16px}
  .mobile-menu-btn{display:block}
}

/* ---------- Page Container ---------- */
.page{display:none;padding:24px;max-width:1200px;margin:0 auto;width:100%;animation:fadeIn 0.3s ease}
.page.active{display:block}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}

/* ---------- Hero ---------- */
.hero{text-align:center;padding:60px 20px 40px}
.hero-logo{display:flex;align-items:center;justify-content:center;gap:14px;margin-bottom:16px}
.hero-logo svg{width:48px;height:48px}
.hero h1{font-size:2.5rem;font-weight:800;letter-spacing:-0.02em}
.hero p{color:var(--text-secondary);font-size:1.1rem;margin-top:8px;max-width:500px;margin-left:auto;margin-right:auto}
@media(max-width:768px){.hero h1{font-size:1.8rem}.hero{padding:40px 16px 24px}}

/* ---------- Stats Cards ---------- */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin:24px 0}
.stat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px;transition:all var(--transition);position:relative;overflow:hidden}
.stat-card:hover{border-color:var(--border-hover);background:var(--bg-card-hover);transform:translateY(-2px)}
.stat-card::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:var(--gradient);opacity:0;transition:opacity var(--transition)}
.stat-card:hover::before{opacity:1}
.stat-card .label{font-size:0.8rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:0.05em;font-weight:600}
.stat-card .value{font-size:2rem;font-weight:700;margin:8px 0 0;font-family:var(--mono)}
.stat-card .icon{position:absolute;top:20px;right:20px;width:40px;height:40px;border-radius:10px;display:flex;align-items:center;justify-content:center;background:var(--gradient-subtle);font-size:1.2rem}

/* ---------- Glass Card ---------- */
.card{background:var(--bg-card);backdrop-filter:blur(12px);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px;transition:all var(--transition)}
.card:hover{border-color:var(--border-hover)}
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:16px;margin:16px 0}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;border-radius:var(--radius-sm);font-size:0.875rem;font-weight:600;transition:all var(--transition);white-space:nowrap}
.btn-primary{background:var(--gradient);color:#fff;box-shadow:0 2px 12px rgba(139,92,246,0.3)}
.btn-primary:hover{box-shadow:0 4px 20px rgba(139,92,246,0.5);transform:translateY(-1px)}
.btn-secondary{background:var(--bg-card);border:1px solid var(--border);color:var(--text-primary)}
.btn-secondary:hover{border-color:var(--border-hover);background:var(--bg-card-hover)}
.btn-danger{background:rgba(239,68,68,0.15);border:1px solid rgba(239,68,68,0.3);color:var(--red)}
.btn-danger:hover{background:rgba(239,68,68,0.25)}
.btn-sm{padding:6px 14px;font-size:0.8rem}
.btn-lg{padding:14px 32px;font-size:1rem;border-radius:var(--radius)}
.btn-icon{padding:8px;border-radius:var(--radius-sm)}
.btn:disabled{opacity:0.4;pointer-events:none}

/* Big generate button */
.btn-generate{background:var(--gradient);color:#fff;font-size:1.1rem;font-weight:700;padding:16px 48px;border-radius:var(--radius);position:relative;overflow:hidden;box-shadow:0 4px 24px rgba(139,92,246,0.4)}
.btn-generate::before{content:'';position:absolute;inset:0;background:linear-gradient(90deg,transparent,rgba(255,255,255,0.15),transparent);transform:translateX(-100%);transition:none}
.btn-generate:hover::before{animation:shimmer 1s ease}
.btn-generate:hover{box-shadow:0 6px 32px rgba(139,92,246,0.6);transform:translateY(-2px)}
@keyframes shimmer{to{transform:translateX(100%)}}

/* ---------- Quick Actions ---------- */
.quick-actions{display:flex;gap:12px;flex-wrap:wrap;justify-content:center;margin:32px 0}

/* ---------- Section ---------- */
.section{margin:32px 0}
.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
.section-title{font-size:1.2rem;font-weight:700}

/* ---------- Badge ---------- */
.badge{display:inline-flex;align-items:center;gap:4px;padding:4px 10px;border-radius:20px;font-size:0.7rem;font-weight:600;text-transform:uppercase;letter-spacing:0.04em}
.badge-queued{background:rgba(234,179,8,0.15);color:var(--yellow);border:1px solid rgba(234,179,8,0.3)}
.badge-training{background:rgba(59,130,246,0.15);color:var(--blue);border:1px solid rgba(59,130,246,0.3);animation:pulse-badge 2s infinite}
.badge-completed{background:rgba(34,197,94,0.15);color:var(--green);border:1px solid rgba(34,197,94,0.3)}
.badge-failed{background:rgba(239,68,68,0.15);color:var(--red);border:1px solid rgba(239,68,68,0.3)}
.badge-generating{background:rgba(139,92,246,0.15);color:var(--purple);border:1px solid rgba(139,92,246,0.3);animation:pulse-badge 2s infinite}
@keyframes pulse-badge{0%,100%{opacity:1}50%{opacity:0.6}}

/* ---------- Progress Bar ---------- */
.progress{height:6px;background:rgba(255,255,255,0.06);border-radius:3px;overflow:hidden;position:relative}
.progress-fill{height:100%;background:var(--gradient);border-radius:3px;transition:width 0.5s ease;position:relative}
.progress-fill::after{content:'';position:absolute;right:0;top:0;bottom:0;width:40px;background:linear-gradient(90deg,transparent,rgba(255,255,255,0.3));animation:progress-shine 1.5s infinite}
@keyframes progress-shine{0%{opacity:0}50%{opacity:1}100%{opacity:0}}

/* ---------- Drag & Drop ---------- */
.drop-zone{border:2px dashed var(--border);border-radius:var(--radius-lg);padding:60px 24px;text-align:center;cursor:pointer;transition:all var(--transition);position:relative}
.drop-zone:hover,.drop-zone.drag-over{border-color:var(--purple);background:rgba(139,92,246,0.05)}
.drop-zone.drag-over{animation:border-pulse 1s infinite}
@keyframes border-pulse{0%,100%{border-color:var(--purple)}50%{border-color:var(--cyan)}}
.drop-zone .icon{font-size:3rem;margin-bottom:16px}
.drop-zone h3{font-size:1.1rem;font-weight:600;margin-bottom:8px}
.drop-zone p{color:var(--text-secondary);font-size:0.85rem}

/* ---------- Form ---------- */
.form-group{margin-bottom:20px}
.form-group label{display:block;font-size:0.85rem;font-weight:600;margin-bottom:6px;color:var(--text-secondary)}
.form-group input,.form-group select,.form-group textarea{width:100%}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:600px){.form-row{grid-template-columns:1fr}}

/* Radio cards */
.radio-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px}
.radio-card{padding:16px;border-radius:var(--radius);border:1px solid var(--border);cursor:pointer;transition:all var(--transition);text-align:center}
.radio-card:hover{border-color:var(--border-hover)}
.radio-card.selected{border-color:var(--purple);background:rgba(139,92,246,0.08);box-shadow:0 0 0 1px var(--purple)}
.radio-card .size{font-size:1.4rem;font-weight:700;font-family:var(--mono)}
.radio-card .desc{font-size:0.75rem;color:var(--text-secondary);margin-top:4px}

/* Collapsible advanced */
.collapsible-header{display:flex;align-items:center;gap:8px;padding:12px 0;cursor:pointer;color:var(--text-secondary);font-size:0.85rem;font-weight:600;user-select:none}
.collapsible-header svg{transition:transform var(--transition)}
.collapsible-header.open svg{transform:rotate(90deg)}
.collapsible-body{max-height:0;overflow:hidden;transition:max-height 0.3s ease}
.collapsible-body.open{max-height:600px}

/* Slider */
.slider-container{position:relative}
.slider-container input[type=range]{width:100%;-webkit-appearance:none;background:transparent;margin:8px 0}
.slider-container input[type=range]::-webkit-slider-track{height:4px;background:rgba(255,255,255,0.1);border-radius:2px}
.slider-container input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:18px;height:18px;border-radius:50%;background:var(--gradient);margin-top:-7px;box-shadow:0 2px 8px rgba(139,92,246,0.4);cursor:pointer}
.slider-value{text-align:right;font-family:var(--mono);font-size:0.85rem;color:var(--purple)}

/* Tooltip */
.tooltip{position:relative;display:inline-flex;align-items:center;cursor:help}
.tooltip::after{content:attr(data-tip);position:absolute;bottom:calc(100% + 8px);left:50%;transform:translateX(-50%);background:#222;color:#ddd;padding:8px 12px;border-radius:var(--radius-sm);font-size:0.75rem;white-space:nowrap;max-width:260px;white-space:normal;pointer-events:none;opacity:0;transition:opacity var(--transition);z-index:50;border:1px solid var(--border)}
.tooltip:hover::after{opacity:1}

/* ---------- File List ---------- */
.file-list{display:flex;flex-direction:column;gap:8px}
.file-item{display:flex;align-items:center;gap:12px;padding:12px 16px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);transition:all var(--transition)}
.file-item:hover{border-color:var(--border-hover)}
.file-item .meta{flex:1;min-width:0}
.file-item .name{font-size:0.9rem;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.file-item .info{font-size:0.75rem;color:var(--text-muted);font-family:var(--mono);margin-top:2px}
.file-item .upload-progress{width:100%;margin-top:6px}
.file-item input[type=checkbox]{accent-color:var(--purple);width:16px;height:16px}

/* ---------- Training Job ---------- */
.job-card{padding:20px;margin-bottom:12px}
.job-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px;flex-wrap:wrap;gap:8px}
.job-header .title{font-weight:600;font-size:0.95rem}
.job-progress{margin:12px 0}
.job-eta{font-size:0.75rem;color:var(--text-muted);font-family:var(--mono);margin-top:4px}
.job-logs{background:var(--bg-primary);border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px;margin-top:12px;max-height:200px;overflow-y:auto;font-family:var(--mono);font-size:0.75rem;line-height:1.8;color:var(--text-secondary)}

/* ---------- Audio Player ---------- */
.audio-player{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:16px;display:flex;align-items:center;gap:14px;transition:all var(--transition)}
.audio-player:hover{border-color:var(--border-hover)}
.audio-player .play-btn{width:40px;height:40px;border-radius:50%;background:var(--gradient);display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:all var(--transition)}
.audio-player .play-btn:hover{transform:scale(1.1);box-shadow:0 4px 16px rgba(139,92,246,0.4)}
.audio-player .play-btn svg{width:16px;height:16px;fill:#fff}
.audio-player .waveform-wrap{flex:1;min-width:0;cursor:pointer}
.audio-player .waveform-canvas{width:100%;height:40px;display:block;border-radius:4px}
.audio-player .time{font-family:var(--mono);font-size:0.75rem;color:var(--text-muted);flex-shrink:0;min-width:80px;text-align:center}
.audio-player .volume-wrap{display:flex;align-items:center;gap:6px}
.audio-player .volume-wrap input[type=range]{width:60px}
.audio-player .download-btn{padding:6px;border-radius:var(--radius-sm);transition:background var(--transition)}
.audio-player .download-btn:hover{background:rgba(255,255,255,0.08)}

/* Mini player */
.mini-player{padding:10px 14px;gap:10px}
.mini-player .waveform-canvas{height:28px}
.mini-player .play-btn{width:32px;height:32px}
.mini-player .time{min-width:auto;font-size:0.7rem}

/* ---------- Generation Card ---------- */
.gen-card{overflow:hidden}
.gen-card .gen-info{padding:16px}
.gen-card .gen-info .prompt{font-size:0.85rem;color:var(--text-secondary);margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.gen-card .gen-meta{display:flex;gap:12px;flex-wrap:wrap;font-size:0.7rem;font-family:var(--mono);color:var(--text-muted)}

/* ---------- Model Card ---------- */
.model-card{cursor:pointer;position:relative;overflow:hidden}
.model-card::before{content:'';position:absolute;inset:0;background:var(--gradient);opacity:0;transition:opacity var(--transition)}
.model-card:hover::before{opacity:0.03}
.model-card .model-name{font-size:1rem;font-weight:700;margin-bottom:4px}
.model-card .model-detail{font-size:0.8rem;color:var(--text-secondary)}
.model-card .model-prompt{font-family:var(--mono);font-size:0.75rem;color:var(--purple);margin-top:8px;padding:6px 10px;background:rgba(139,92,246,0.08);border-radius:var(--radius-sm);display:inline-block}
.model-card .model-actions{display:flex;gap:8px;margin-top:12px}

/* ---------- Modal ---------- */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,0.6);backdrop-filter:blur(4px);z-index:200;display:flex;align-items:center;justify-content:center;padding:24px;opacity:0;pointer-events:none;transition:opacity 0.2s ease}
.modal-overlay.open{opacity:1;pointer-events:auto}
.modal{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-lg);padding:32px;max-width:520px;width:100%;transform:scale(0.95);transition:transform 0.2s ease;max-height:80vh;overflow-y:auto}
.modal-overlay.open .modal{transform:scale(1)}
.modal h2{font-size:1.2rem;font-weight:700;margin-bottom:20px}
.modal-actions{display:flex;gap:12px;justify-content:flex-end;margin-top:24px}

/* ---------- Toast ---------- */
.toast-container{position:fixed;top:80px;right:24px;z-index:300;display:flex;flex-direction:column;gap:8px;pointer-events:none}
.toast{pointer-events:auto;display:flex;align-items:center;gap:10px;padding:14px 20px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);font-size:0.85rem;animation:toast-in 0.3s ease;max-width:380px}
.toast.toast-out{animation:toast-out 0.3s ease forwards}
.toast-success{border-left:3px solid var(--green)}
.toast-error{border-left:3px solid var(--red)}
.toast-info{border-left:3px solid var(--blue)}
@keyframes toast-in{from{opacity:0;transform:translateX(40px)}to{opacity:1;transform:translateX(0)}}
@keyframes toast-out{to{opacity:0;transform:translateX(40px)}}

/* ---------- Empty State ---------- */
.empty-state{text-align:center;padding:60px 20px}
.empty-state .icon{font-size:3rem;margin-bottom:16px;opacity:0.3}
.empty-state h3{font-size:1.1rem;font-weight:600;margin-bottom:8px;color:var(--text-secondary)}
.empty-state p{color:var(--text-muted);font-size:0.85rem;max-width:360px;margin:0 auto 20px}

/* ---------- Skeleton ---------- */
.skeleton{background:linear-gradient(90deg,rgba(255,255,255,0.03) 25%,rgba(255,255,255,0.06) 50%,rgba(255,255,255,0.03) 75%);background-size:200% 100%;animation:skeleton-load 1.5s infinite;border-radius:var(--radius-sm)}
@keyframes skeleton-load{to{background-position:-200% 0}}
.skeleton-card{height:140px;border-radius:var(--radius-lg)}
.skeleton-line{height:14px;margin-bottom:8px;width:60%}
.skeleton-line.short{width:35%}

/* ---------- Misc ---------- */
.divider{border:none;border-top:1px solid var(--border);margin:24px 0}
.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.gap-2{gap:8px}.gap-3{gap:12px}.gap-4{gap:16px}
.mt-2{margin-top:8px}.mt-4{margin-top:16px}.mb-2{margin-bottom:8px}.mb-4{margin-bottom:16px}
.text-sm{font-size:0.85rem}.text-xs{font-size:0.75rem}.text-muted{color:var(--text-muted)}.text-secondary{color:var(--text-secondary)}
.w-full{width:100%}
.hidden{display:none!important}