*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{--purple:#9b7aff;--purple-dark:#7c5ce7;--purple-light:#c4b5fd;--purple-ultra-light:#ede9fe;--purple-bg:#f5f3ff;--black:#1a1a2e;--dark-gray:#374151;--medium-gray:#6b7280;--light-gray:#9ca3af;--border:#e5e7eb;--white:#fff;--bg:#fafafa;--green:#22c55e;--red:#ef4444;--shadow-md:0 4px 14px rgba(155,122,255,.25);--shadow-lg:0 10px 15px -3px rgba(0,0,0,.08),0 4px 6px -4px rgba(0,0,0,.05);--shadow-xl:0 20px 25px -5px rgba(0,0,0,.08),0 8px 10px -6px rgba(0,0,0,.04);--shadow-purple:0 4px 14px rgba(155,122,255,.3);--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:20px;--radius-full:9999px;--ease:transform .3s cubic-bezier(.4,0,.2,1),opacity .3s cubic-bezier(.4,0,.2,1),box-shadow .3s cubic-bezier(.4,0,.2,1)}

html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:var(--bg);line-height:1.6;overflow-x:hidden}

body.dark-mode{
  --purple:#8B5CF6;--purple-dark:#7c3aed;--purple-light:#a78bfa;
  --purple-ultra-light:#1a1a1f;--purple-bg:#161618;
  --black:#e6e6e6;--dark-gray:#e6e6e6;--medium-gray:#A1A1AA;--light-gray:#71717A;
  --border:#2a2a2e;--white:#121212;--bg:#121212;
  --green:#16a34a;--red:#dc2626;
  --shadow-md:0 4px 14px rgba(0,0,0,.7);
  --shadow-lg:0 10px 15px -3px rgba(0,0,0,.6),0 4px 6px -4px rgba(0,0,0,.5);
  --shadow-xl:0 20px 25px -5px rgba(0,0,0,.7),0 8px 10px -6px rgba(0,0,0,.5);
}
body.dark-mode .navbar{background: var(--bg);border-bottom:1px solid #1e1e1e}
body.dark-mode .nav-menu{background: var(--bg)}
body.dark-mode .nav-link{color:var(--medium-gray)}
body.dark-mode .nav-link:hover,.dark-mode .nav-link.active{color:var(--purple)}
body.dark-mode{background:var(--bg)}
body.dark-mode .footer{background: var(--bg);border-top:1px solid #1e1e1e}
body.dark-mode .hamburger-line{background:#e6e6e6}
.theme-toggle-btn{position:fixed;bottom:28px;right:24px;width:44px;height:44px;border-radius:50%;background:rgba(255,255,255,.1);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border:1px solid rgba(255,255,255,.18);cursor:pointer;display:flex;align-items:center;justify-content:center;z-index:1600;box-shadow:0 2px 12px rgba(0,0,0,.15),inset 0 1px 0 rgba(255,255,255,.15);transition:transform .2s cubic-bezier(.4,0,.2,1),background .2s ease,box-shadow .2s ease,border-color .2s ease;color:#fff}
.theme-toggle-btn:hover{transform:scale(1.08);background:rgba(255,255,255,.18);box-shadow:0 4px 20px rgba(0,0,0,.2),inset 0 1px 0 rgba(255,255,255,.2)}
.theme-toggle-btn:active{transform:scale(.94)}
.theme-toggle-btn svg{transition:opacity .25s ease,transform .3s cubic-bezier(.34,1.56,.64,1)}
.theme-toggle-btn .icon-sun{position:absolute}
.theme-toggle-btn .icon-moon{position:absolute}
body:not(.dark-mode) .theme-toggle-btn{background:#d8d8d8;border-color:#505050d5;color:#fff}
body:not(.dark-mode) .theme-toggle-btn:hover{background:#cacaca}
body:not(.dark-mode) .theme-toggle-btn .icon-sun{opacity:0;transform:rotate(-60deg) scale(.5)}
body:not(.dark-mode) .theme-toggle-btn .icon-moon{opacity:1;transform:rotate(0deg) scale(1)}
body.dark-mode .theme-toggle-btn{background:rgba(255,255,240,.08);border-color:rgba(255,255,240,.2);color:#FFFFD0}
body.dark-mode .theme-toggle-btn:hover{background:rgba(255,255,240,.14)}
body.dark-mode .theme-toggle-btn .icon-sun{opacity:1;transform:rotate(0deg) scale(1)}
body.dark-mode .theme-toggle-btn .icon-moon{opacity:0;transform:rotate(60deg) scale(.5)}
a{text-decoration:none;color:inherit}
button{border:none;background:none;cursor:pointer;font-family:inherit}
ul{list-style:none}
img{display:block;max-width:100%}

.navbar{position:fixed;top:0;left:0;right:0;z-index:1000;background:var(--bg);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid rgba(229,231,235,.5);transition:var(--ease)}
.navbar.scrolled{box-shadow:var(--shadow-md)}
.nav-container{max-width:1200px;margin:0 auto;padding:0 24px 0 2px;height:72px;display:flex;align-items:center;justify-content:space-between}
.nav-logo{display:flex;align-items:center;gap:10px;z-index:1001}
.logo-text{font-size:1.1rem;font-weight:700;color:var(--purple);letter-spacing:-.02em}
.nav-menu{display:flex;align-items:center;gap:8px}
.nav-link{padding:8px 18px;font-size:.9rem;font-weight:500;color:var(--medium-gray);border-radius:var(--radius-full);transition:var(--ease)}
.nav-link:hover,.nav-link.active{color:var(--purple)}
.nav-toggle{display:none;flex-direction:column;gap:5px;padding:8px;z-index:1001}
.hamburger-line{width:22px;height:2px;background:var(--black);border-radius:2px;transition:var(--ease);transform-origin:center}

.page{max-width:1100px;margin:0 auto;padding:160px 24px 80px}
.page-header{text-align:center;margin-bottom:56px}
.page-title{font-size:clamp(2rem,5vw,3.2rem);font-weight:800;color:var(--black);letter-spacing:-.03em;line-height:1.15;margin-bottom:12px;animation:fadeInUp .8s ease .1s both}
.page-desc{font-size:1rem;color:var(--medium-gray);max-width:500px;margin:0 auto;animation:fadeInUp .8s ease .2s both}

.card{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-xl);padding:28px;box-shadow:var(--shadow-lg);margin-bottom:20px}
.card-title{font-size:.95rem;font-weight:700;color:var(--black);margin-bottom:20px;display:flex;align-items:center;gap:8px}
.card-title svg{color:var(--purple);flex-shrink:0}

#upload-section{padding:80px 24px 100px}

.intro-buttons-row{display:flex;gap:12px;flex-wrap:wrap}

.intro-btn-card{flex:1;min-width:220px;display:flex;align-items:center;gap:14px;background:var(--bg);border:2px solid var(--border);border-radius:var(--radius-lg);padding:16px 20px;cursor:pointer;transition:var(--ease);position:relative;text-align:left}
.intro-btn-card:hover{border-color:var(--purple-light);background:var(--purple-ultra-light);transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.intro-btn-card.loaded{border-color:var(--green);background:rgba(34,197,94,.08)}
.intro-btn-card.loaded:hover{border-color:#16a34a;background:rgba(34,197,94,.14)}
.intro-btn-card.error{border-color:var(--red);background:rgba(239,68,68,.08)}
.intro-btn-card.error:hover{border-color:#dc2626;background:rgba(239,68,68,.14)}

.intro-btn-icon{width:44px;height:44px;border-radius:var(--radius-md);background:var(--purple-ultra-light);display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:var(--ease)}
.intro-btn-card.loaded .intro-btn-icon{background:rgba(34,197,94,.15)}
.intro-btn-card.error  .intro-btn-icon{background:rgba(239,68,68,.15)}

.intro-btn-info{flex:1;min-width:0}
.intro-btn-title{font-size:.9rem;font-weight:700;color:var(--black);margin-bottom:3px}
.intro-btn-status{font-size:.76rem;color:var(--medium-gray);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.intro-btn-card.loaded .intro-btn-status{color:var(--green);font-weight:600}
.intro-btn-card.error  .intro-btn-status{color:var(--red)}

.intro-badge{position:absolute;top:8px;right:10px;font-size:.65rem;font-weight:700;letter-spacing:.04em;padding:2px 8px;border-radius:var(--radius-full);background:var(--purple-ultra-light);color:var(--purple-dark);text-transform:uppercase;pointer-events:none}
.intro-btn-card.loaded .intro-badge{background:rgba(34,197,94,.15);color:var(--green)}
.intro-btn-card.error  .intro-badge{background:rgba(239,68,68,.15);color:var(--red)}

.upload-zone{border:2px dashed var(--border);border-radius:var(--radius-lg);padding:52px 24px;text-align:center;cursor:pointer;transition:var(--ease)}
.upload-zone:hover,.upload-zone.dragover{border-color:var(--purple);background:var(--purple-ultra-light)}
.upload-zone-icon{width:64px;height:64px;background:var(--purple-ultra-light);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;margin:0 auto 16px}
.upload-zone h3{font-size:1.1rem;font-weight:700;color:var(--black);margin-bottom:6px}
.upload-zone p{font-size:.9rem;color:var(--medium-gray);margin-bottom:16px}
.upload-formats{display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap}
.fmt-tag{padding:4px 12px;background:var(--purple-ultra-light);border:1px solid var(--purple-light);border-radius:var(--radius-full);font-size:.75rem;font-weight:600;color:var(--purple-dark)}

.track-row{display:flex;align-items:center;gap:20px;flex-wrap:wrap}
.track-icon{width:64px;height:64px;background:var(--purple-ultra-light);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.track-info{flex:1;min-width:0}
.track-name{font-size:1.1rem;font-weight:700;color:var(--black);margin-bottom:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.track-meta{font-size:.82rem;color:var(--medium-gray)}

.player-row{display:flex;align-items:center;gap:16px;margin-bottom:12px}
.play-btn{width:52px;height:52px;border-radius:50%;background:linear-gradient(135deg,var(--purple),var(--purple-dark));color:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0;box-shadow:var(--shadow-purple);transition:var(--ease)}
.play-btn:hover{transform:scale(1.05);box-shadow:0 6px 20px rgba(155,122,255,.45)}
.waveform-wrap{flex:1;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-md);height:80px;position:relative;overflow:hidden;cursor:pointer}
#waveformCanvas{width:100%;height:100%;display:block}
.waveform-progress{position:absolute;top:0;left:0;height:100%;background:rgba(155,122,255,.15);pointer-events:none;transition:width .1s linear}
.time-row{display:flex;justify-content:space-between;align-items:center;font-size:.78rem;color:var(--light-gray)}
.intro-indicator{font-size:.78rem;color:var(--medium-gray);display:flex;align-items:center;gap:5px}
.intro-indicator.ok{color:var(--green);font-weight:600}

.presets-grid{display:flex;flex-wrap:wrap;gap:10px}
.preset-btn{display:inline-flex;align-items:center;gap:7px;padding:10px 18px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-full);font-size:.85rem;font-weight:600;color:var(--dark-gray);transition:var(--ease);cursor:pointer;font-family:inherit}
.preset-btn:hover{border-color:var(--purple-light);color:var(--purple);background:var(--purple-ultra-light)}
.preset-btn.active{background:var(--purple);color:#fff;border-color:var(--purple);box-shadow:var(--shadow-purple)}
.preset-btn svg{flex-shrink:0}

.effects-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}
.effect-card{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px;transition:var(--ease);cursor:default}
.effect-card.toggleable{cursor:pointer}
.effect-card:hover{border-color:var(--purple-light);box-shadow:var(--shadow-lg)}
.effect-card.active{border-color:var(--purple);background:var(--purple-ultra-light)}
.effect-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
.effect-label{display:flex;align-items:center;gap:10px}
.effect-icon{width:38px;height:38px;background:var(--purple-ultra-light);border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;color:var(--purple);flex-shrink:0;transition:var(--ease)}
.effect-card.active .effect-icon{background:var(--purple);color:#fff}
.effect-name{font-size:.88rem;font-weight:700;color:var(--black)}
.effect-desc{font-size:.72rem;color:var(--medium-gray)}

.toggle{width:44px;height:24px;border-radius:var(--radius-full);background:var(--border);display:flex;align-items:center;padding:2px;transition:background .3s;cursor:pointer;flex-shrink:0}
.toggle.on{background:var(--purple)}
.toggle-knob{width:20px;height:20px;border-radius:50%;background:var(--white);box-shadow:0 1px 4px rgba(0,0,0,.2);transition:transform .3s;pointer-events:none}
.toggle.on .toggle-knob{transform:translateX(20px)}

.slider-wrap{margin-top:12px}
.slider-wrap.hidden{display:none}
.slider-labels{display:flex;justify-content:space-between;font-size:.7rem;color:var(--light-gray);margin-top:6px}
.slider-val{color:var(--purple);font-weight:600}

input[type="range"]{-webkit-appearance:none;appearance:none;width:100%;height:5px;border-radius:3px;background:var(--border);outline:none;cursor:pointer;transition:var(--ease)}
input[type="range"]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:18px;height:18px;border-radius:50%;background:var(--purple);cursor:pointer;box-shadow:0 0 0 3px var(--purple-ultra-light);transition:var(--ease)}
input[type="range"]::-webkit-slider-thumb:hover{box-shadow:0 0 0 5px var(--purple-light)}
input[type="range"]::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:var(--purple);cursor:pointer;border:none;box-shadow:0 0 0 3px var(--purple-ultra-light)}
input[type="range"]::-moz-range-track{height:5px;border-radius:3px;background:var(--border)}

.fade-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.fade-label{font-size:.85rem;font-weight:600;color:var(--dark-gray);margin-bottom:10px}

.trim-canvas-wrap{position:relative;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-md);height:80px;overflow:hidden;cursor:col-resize;user-select:none;-webkit-user-select:none}
#trimCanvas{width:100%;height:100%;display:block}
.trim-info-row{display:flex;justify-content:space-between;align-items:center;margin-top:10px;flex-wrap:wrap;gap:8px}
.trim-time-badge{display:inline-flex;align-items:center;gap:6px;padding:5px 14px;background:var(--purple-ultra-light);border:1px solid var(--purple-light);border-radius:var(--radius-full);font-size:.78rem;font-weight:600;color:var(--purple-dark)}
.trim-actions{display:flex;gap:8px;flex-wrap:wrap}

.export-center{text-align:center}
.export-icon{width:64px;height:64px;background:var(--purple-ultra-light);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;margin:0 auto 16px}
.export-title{font-size:1.2rem;font-weight:800;color:var(--black);margin-bottom:8px}
.export-desc{font-size:.9rem;color:var(--medium-gray);margin-bottom:28px;max-width:400px;margin-left:auto;margin-right:auto}
.progress-wrap{margin-bottom:24px}
.progress-track{height:6px;background:var(--border);border-radius:var(--radius-full);overflow:hidden;margin-bottom:8px}
.progress-bar{height:100%;background:linear-gradient(90deg,var(--purple),var(--purple-dark));border-radius:var(--radius-full);width:0%;transition:width .3s ease}
.progress-status{font-size:.82rem;color:var(--medium-gray)}

.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 28px;border-radius:var(--radius-full);font-family:inherit;font-size:.95rem;font-weight:600;cursor:pointer;transition:var(--ease);border:none}
.btn-primary{background:linear-gradient(135deg,var(--purple),var(--purple-dark));color:#fff;box-shadow:var(--shadow-purple)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(155,122,255,.45)}
.btn-primary:disabled{opacity:.6;cursor:not-allowed;transform:none}
.btn-secondary{background:var(--white);color:var(--dark-gray);border:1px solid var(--border);box-shadow:var(--shadow-lg)}
.btn-secondary:hover{border-color:var(--purple-light);color:var(--purple);box-shadow:var(--shadow-lg),0 0 0 3px var(--purple-ultra-light)}
.btn-sm{padding:8px 16px;font-size:.82rem}

.footer{background:var(--bg);border-top:1px solid var(--border);padding:60px 0 0;margin-top:0}
.footer-container{max-width:1200px;margin:0 auto;padding:0 24px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1.5fr;gap:48px;padding-bottom:48px}
.footer-brand{font-size:1.1rem;font-weight:700;color:var(--purple);letter-spacing:-.02em;display:block;margin-bottom:12px}
.footer-col-title{font-size:.8rem;font-weight:700;color:var(--black);text-transform:uppercase;letter-spacing:.08em;display:block;margin-bottom:16px}
.footer-desc{font-size:.875rem;color:var(--medium-gray);line-height:1.6}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a{font-size:.875rem;color:var(--medium-gray);transition:color .2s}
.footer-links a:hover{color:var(--purple)}
.footer-bottom{border-top:1px solid var(--border);padding:20px 0;text-align:center}
.footer-bottom p{font-size:.8rem;color:var(--medium-gray)}
@media(max-width:768px){.footer{padding:0}.footer-grid{display:none}.footer-bottom{border-top:none;padding:16px 0}}

@keyframes fadeInUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}
@keyframes fadeInDown{from{opacity:0;transform:translateY(-16px)}to{opacity:1;transform:translateY(0)}}
@keyframes float{0%,100%{transform:translate(0,0)}25%{transform:translate(10px,-20px)}50%{transform:translate(-5px,10px)}75%{transform:translate(15px,5px)}}
@keyframes spin{to{transform:rotate(360deg)}}
.animate-hidden{opacity:0;transform:translateY(20px)}
.animate-in{animation:fadeInUp .5s ease forwards}

.hidden{display:none!important}
::-webkit-scrollbar{width:8px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:var(--purple-light);border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:var(--purple)}
::selection{background:var(--purple);color:#fff}

.notification{position:fixed;bottom:20px;right:20px;background:var(--white);border-radius:var(--radius-md);box-shadow:var(--shadow-xl);min-width:260px;max-width:320px;overflow:hidden;opacity:0;pointer-events:none;transform:translateY(16px);transition:opacity .3s ease,transform .3s ease;z-index:2000}
.notification.show{opacity:1;pointer-events:auto;transform:translateY(0)}
.notif-inner{display:flex;align-items:center;gap:12px;padding:14px 18px 12px}
.notif-icon{width:36px;height:36px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.notif-msg{font-size:.88rem;font-weight:600;color:var(--black);line-height:1.4}
.notif-bar{height:3px;background:linear-gradient(90deg,var(--purple),var(--purple-dark));width:100%;transform-origin:left}
.notification.show .notif-bar{animation:notifProgress 4s linear forwards}
@keyframes notifProgress{from{transform:scaleX(1)}to{transform:scaleX(0)}}

@media(max-width:900px){
  .logo-text{padding-left:24px}
  .page{padding-top:130px}
}

@media(max-width:640px){
  .nav-toggle{display:flex}
  .nav-menu{position:fixed;top:0;right:-100%;width:280px;height:100vh;height:100dvh;background:var(--white);flex-direction:column;align-items:flex-start;padding:100px 32px 32px;gap:4px;box-shadow:var(--shadow-xl);transition:right .4s cubic-bezier(.4,0,.2,1)}
  .nav-menu.open{right:0}
  .logo-text{padding-left:24px}
  .nav-menu.open::before{content:'';position:fixed;top:0;left:-100vw;width:100vw;height:100vh;height:100dvh;background:rgba(0,0,0,.3)}
  .nav-link{width:100%;padding:14px 18px;font-size:1rem;border-radius:var(--radius-sm)}
  .nav-toggle.active .hamburger-line:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
  .nav-toggle.active .hamburger-line:nth-child(2){opacity:0}
  .nav-toggle.active .hamburger-line:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}
  .page{padding-top:120px}
  .fade-grid{grid-template-columns:1fr}
  .track-row{flex-direction:column;text-align:center}
  .intro-buttons-row{flex-direction:column}
  .intro-btn-card{min-width:100%}
  .player-row{flex-direction:column}
  .waveform-wrap{width:100%}
  .notification{bottom:16px;left:16px;right:16px;max-width:none;transform:translateY(16px)}
  .notification.show{transform:translateY(0)}
}