/* === Theme System === */
:root{
  --bg:#000;--bg2:rgba(255,255,255,.015);--bg3:rgba(255,255,255,.025);--bg4:rgba(255,255,255,.035);--bg5:rgba(255,255,255,.05);
  --text:#f5f5f7;--text2:rgba(255,255,255,.7);--text3:rgba(255,255,255,.4);--text4:rgba(255,255,255,.25);--text5:rgba(255,255,255,.15);
  --border:rgba(255,255,255,.06);--border2:rgba(255,255,255,.1);--border3:rgba(255,255,255,.15);
  --glass:rgba(0,0,0,.72);--glass-border:rgba(255,255,255,.08);
  --accent:#0071ED;--accent-hover:#0077F5;--accent-glow:rgba(0,122,255,.12);
  --hero-g1:rgba(0,122,255,.12);--hero-g2:rgba(100,80,255,.08);--hero-g3:rgba(255,107,107,.05);--hero-g4:rgba(0,122,255,.04);
  --danger:#ff453a;--success:#34c759;
}
.light{
  --bg:#f5f5f7;--bg2:rgba(0,0,0,.02);--bg3:rgba(0,0,0,.03);--bg4:rgba(0,0,0,.04);--bg5:rgba(0,0,0,.05);
  --text:#1d1d1f;--text2:rgba(0,0,0,.75);--text3:rgba(0,0,0,.5);--text4:rgba(0,0,0,.35);--text5:rgba(0,0,0,.2);
  --border:rgba(0,0,0,.06);--border2:rgba(0,0,0,.1);--border3:rgba(0,0,0,.15);
  --glass:rgba(245,245,247,.8);--glass-border:rgba(0,0,0,.08);
  --accent-glow:rgba(0,122,255,.08);
  --hero-g1:rgba(0,122,255,.06);--hero-g2:rgba(100,80,255,.04);--hero-g3:rgba(255,107,107,.03);--hero-g4:rgba(0,122,255,.02);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;background:var(--bg);color:var(--text);line-height:1.5;min-height:100vh;transition:background .4s ease,color .4s ease}
::selection{background:rgba(0,122,255,.4)}
a{color:inherit;text-decoration:none}

.theme-toggle{background:none;border:1px solid var(--border3);color:var(--text3);width:32px;height:32px;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .4s ease;font-size:.85rem;font-family:inherit;flex-shrink:0}
.theme-toggle:hover{border-color:var(--accent);color:var(--accent)}
.theme-toggle svg{width:15px;height:15px;transition:transform .5s cubic-bezier(.34,1.56,.64,1)}
.light .theme-toggle svg{transform:none}

.nav{position:fixed;top:0;left:0;right:0;z-index:100;height:52px;display:flex;align-items:center;justify-content:space-between;padding:0 2rem;background:var(--glass);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid var(--glass-border);transition:background .4s ease,border-color .4s ease}
.nav-brand{font-size:1.05rem;font-weight:600;letter-spacing:-.02em;color:var(--text);display:flex;align-items:center;gap:.5rem}
.nav-brand svg{width:20px;height:20px}
.nav-links{display:flex;gap:1.5rem;list-style:none;align-items:center}
.nav-links a{color:var(--text2);font-size:.78rem;transition:color .2s;letter-spacing:-.01em}
.nav-links a:hover,.nav-links a.active{color:var(--text)}
.nav-back{display:flex;align-items:center;gap:.35rem;color:var(--text3);font-size:.8rem;transition:color .2s}
.nav-back:hover{color:var(--text)}
.nav-back svg{width:14px;height:14px}

.hero{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:6rem 2rem 4rem;position:relative}
.hero-bg{position:absolute;inset:0;background:radial-gradient(ellipse 80% 60% at 50% 30%,var(--hero-g1),transparent 50%),radial-gradient(ellipse 50% 40% at 20% 80%,var(--hero-g2),transparent 45%),radial-gradient(ellipse 50% 40% at 80% 20%,var(--hero-g3),transparent 45%),radial-gradient(ellipse 60% 50% at 50% 60%,var(--hero-g4),transparent 60%);pointer-events:none;transition:background .4s ease}
.hero h1{font-size:clamp(2.5rem,6vw,4.5rem);font-weight:700;letter-spacing:-.03em;line-height:1.1;margin-bottom:1rem;animation:fadeUp .8s cubic-bezier(.16,1,.3,1) both}
.hero h1 span{background:linear-gradient(135deg,#0071ED,#5AC8FA,#BF5AF2,#FF6B6B);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;background-size:200% 200%;animation:gradientShift 6s ease infinite}
.hero p{font-size:1.15rem;color:var(--text3);max-width:480px;font-weight:300;animation:fadeUp .8s .1s cubic-bezier(.16,1,.3,1) both}
@keyframes fadeUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}
@keyframes gradientShift{0%,100%{background-position:0% 50%}50%{background-position:100% 50%}}

.tool-header{padding:6rem 2rem 3rem;text-align:center;max-width:960px;margin:0 auto}
.tool-header h1{font-size:2.2rem;font-weight:700;letter-spacing:-.02em;margin-bottom:.5rem}
.tool-header .desc{color:var(--text3);font-weight:300;max-width:500px;margin:0 auto}
.tool-body{max-width:800px;margin:0 auto;padding:0 2rem 6rem}

.section{max-width:1100px;margin:0 auto;padding:5rem 2rem}
.section-label{font-size:.7rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text4);margin-bottom:1.5rem;font-weight:500}
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:1rem}
.tool-card{background:var(--bg4);border:1px solid var(--border);border-radius:16px;padding:1.5rem;transition:all .4s cubic-bezier(.25,1,.5,1);cursor:pointer;position:relative;overflow:hidden;display:block;color:var(--text)}
.tool-card::before{content:'';position:absolute;inset:0;background:radial-gradient(300px circle at var(--mx,50%) var(--my,50%),var(--accent-glow),transparent 60%);opacity:0;transition:opacity .4s}
.tool-card:hover{transform:translateY(-3px);border-color:var(--border2);box-shadow:0 16px 32px rgba(0,0,0,.15)}
.tool-card:hover::before{opacity:1}
.tool-card .card-icon{font-size:1.4rem;margin-bottom:.75rem;width:42px;height:42px;border-radius:11px;background:var(--accent-glow);display:flex;align-items:center;justify-content:center}
.tool-card h3{font-size:.9rem;font-weight:600;margin-bottom:.2rem;letter-spacing:-.01em}
.tool-card .card-desc{font-size:.75rem;color:var(--text3);line-height:1.4}

.upload-zone{border:2px dashed var(--border2);border-radius:15px;padding:3rem 2rem;text-align:center;transition:all .4s;cursor:pointer;background:var(--bg2)}
.upload-zone.drag-over{border-color:var(--accent);background:var(--accent-glow)}
.upload-zone .upload-icon{margin-bottom:.75rem;opacity:.4}
.upload-zone p{color:var(--text3);font-size:.88rem}
.upload-zone .or{color:var(--text5);margin:.6rem 0;font-size:.78rem}
.btn-sm{display:inline-block;background:var(--bg5);border:1px solid var(--border2);color:var(--text);padding:.5rem 1.1rem;border-radius:18px;font-size:.78rem;cursor:pointer;transition:all .3s;font-family:inherit}
.btn-sm:hover{background:var(--border)}
.btn-primary{display:inline-flex;align-items:center;gap:.4rem;background:var(--accent);color:#fff;border:none;padding:.6rem 1.4rem;border-radius:18px;font-size:.82rem;font-weight:500;cursor:pointer;transition:all .3s;font-family:inherit;letter-spacing:-.01em}
.btn-primary:hover{background:var(--accent-hover);transform:scale(1.02)}
.btn-primary:active{transform:scale(.97)}
.btn-primary:disabled{opacity:.35;cursor:not-allowed;transform:none}
.btn-outline{display:inline-flex;align-items:center;gap:.35rem;background:transparent;color:var(--text);border:1px solid var(--border3);padding:.6rem 1.4rem;border-radius:18px;font-size:.82rem;font-weight:500;cursor:pointer;transition:all .3s;font-family:inherit}
.btn-outline:hover{background:var(--bg5);border-color:var(--text4)}

.form-group{margin-bottom:1.25rem}
.form-group label{display:block;font-size:.78rem;color:var(--text3);margin-bottom:.4rem;font-weight:500}
input[type=text],input[type=url],textarea,select,input[type=number]{background:var(--bg4);border:1px solid var(--border2);color:var(--text);padding:.6rem .85rem;border-radius:10px;font-size:.85rem;font-family:inherit;outline:none;transition:border-color .3s,background .4s;width:100%;resize:vertical}
input:focus,textarea:focus,select:focus{border-color:var(--accent)}
textarea{min-height:140px;font-family:'SF Mono','Fira Code','Cascadia Code',monospace;font-size:.82rem}
select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='rgba(128,128,128,.4)' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right .7rem center;padding-right:2rem}
input[type=range]{-webkit-appearance:none;flex:1;height:4px;background:var(--border2);border-radius:2px;outline:none}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:20px;height:20px;border-radius:50%;background:var(--accent);cursor:pointer;box-shadow:0 0 0 5px var(--accent-glow);transition:box-shadow .2s}
input[type=range]::-webkit-slider-thumb:hover{box-shadow:0 0 0 8px var(--accent-glow)}
input[type=file]{display:none}

.control-row{display:flex;align-items:center;gap:1rem;flex-wrap:wrap;margin:1.25rem 0}
.control-row label{font-size:.78rem;color:var(--text3);white-space:nowrap}
.preview-row{display:flex;gap:1.25rem;flex-wrap:wrap;margin-top:1.5rem}
.preview-card{flex:1;min-width:180px;background:var(--bg3);border-radius:13px;padding:1.25rem;border:1px solid var(--border)}
.preview-card .p-label{font-size:.7rem;color:var(--text4);text-transform:uppercase;letter-spacing:.05em;margin-bottom:.75rem}
.preview-card img{max-width:100%;border-radius:8px;display:block}
.preview-card .p-size{font-size:.78rem;color:var(--text3);margin-top:.5rem}
.result-bar{margin-top:1.5rem;display:none;align-items:center;gap:1rem}
.result-bar.show{display:flex}

.toast{position:fixed;bottom:2rem;left:50%;transform:translateX(-50%);background:var(--accent);color:#fff;padding:.55rem 1.2rem;border-radius:18px;font-size:.78rem;font-weight:500;opacity:0;transition:opacity .3s;pointer-events:none;z-index:300}
.toast.show{opacity:1}

.ad-slot{background:var(--bg3);border:1px solid var(--border);border-radius:12px;padding:1.5rem;text-align:center;color:var(--text5);font-size:.72rem;margin:2rem 0;max-width:800px;margin-left:auto;margin-right:auto;transition:all .4s ease}
.ad-slot.horizontal{min-height:90px;display:flex;align-items:center;justify-content:center}

.site-footer{text-align:center;padding:3rem 2rem;border-top:1px solid var(--border);color:var(--text5);font-size:.72rem;max-width:1100px;margin:0 auto}
.site-footer a{color:var(--text4);text-decoration:none}
.site-footer a:hover{color:var(--text2)}
.site-footer .footer-links{display:flex;justify-content:center;gap:2rem;margin-bottom:.75rem}

.file-list{margin-top:1.25rem}
.file-item{display:flex;align-items:center;justify-content:space-between;padding:.7rem 1rem;background:var(--bg3);border-radius:9px;margin-bottom:.4rem;border:1px solid var(--border);font-size:.82rem;gap:.5rem}
.file-item .fname{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0}
.file-item .fsize{font-size:.72rem;color:var(--text4);white-space:nowrap}
.file-item .fbtn{background:none;border:none;color:var(--text4);cursor:pointer;padding:.2rem .35rem;transition:color .2s;font-size:.8rem;font-family:inherit}
.file-item .fbtn:hover{color:var(--danger)}
.file-item .fbtn.arrow{color:var(--text5)}
.file-item .fbtn.arrow:hover{color:var(--accent)}

.palette-row{display:flex;gap:.5rem;margin-top:1.5rem;flex-wrap:wrap}
.swatch-block{width:75px;height:75px;border-radius:13px;cursor:pointer;position:relative;transition:transform .2s;display:flex;align-items:flex-end;justify-content:center;padding:.4rem}
.swatch-block:hover{transform:scale(1.07)}
.swatch-block .sw-hex{font-size:.65rem;font-weight:500;background:rgba(0,0,0,.55);padding:.15rem .4rem;border-radius:5px;color:#fff;opacity:0;transition:opacity .2s}
.swatch-block:hover .sw-hex{opacity:1}

.code-output{background:var(--bg3);border:1px solid var(--border);border-radius:10px;padding:1rem;font-family:'SF Mono','Fira Code','Cascadia Code',monospace;font-size:.8rem;white-space:pre-wrap;word-break:break-all;max-height:400px;overflow:auto;margin-top:.75rem;color:var(--text);transition:all .4s ease}
.mono{font-family:'SF Mono','Fira Code','Cascadia Code',monospace}

/* Carousel */
.carousel-wrap{position:relative;width:100%;max-width:340px;height:120px;margin:2.5rem auto 0;opacity:0;animation:fadeUp .8s .35s cubic-bezier(.16,1,.3,1) forwards}
.carousel-card{position:absolute;inset:0;background:var(--bg4);border:1px solid var(--border);border-radius:18px;padding:1.25rem 1.5rem;display:flex;align-items:center;gap:1rem;opacity:0;transform:translateY(12px);transition:all .45s cubic-bezier(.25,1,.5,1);pointer-events:none}
.carousel-card.active{opacity:1;transform:translateY(0);pointer-events:auto}
.carousel-card .c-icon{width:42px;height:42px;border-radius:12px;background:var(--accent-glow);display:flex;align-items:center;justify-content:center;font-size:1.3rem;flex-shrink:0}
.carousel-card .c-info h3{font-size:.9rem;font-weight:600;margin-bottom:.15rem;letter-spacing:-.01em;color:var(--text)}
.carousel-card .c-info p{font-size:.75rem;color:var(--text3)}
.carousel-dots{display:flex;justify-content:center;gap:.4rem;margin-top:.75rem}
.carousel-dots button{width:6px;height:6px;border-radius:50%;border:none;background:var(--border3);cursor:pointer;padding:0;transition:all .3s}
.carousel-dots button.active{background:var(--accent);width:18px;border-radius:3px}

/* Scroll hint */
.scroll-hint{position:fixed;bottom:1.5rem;left:50%;transform:translateX(-50%);z-index:50;opacity:0;display:flex;flex-direction:column;align-items:center;gap:.5rem;cursor:pointer;animation:fadeInHint .8s .6s cubic-bezier(.16,1,.3,1) forwards}
.scroll-hint .arrow-ring{width:44px;height:44px;border-radius:50%;border:1.5px solid var(--border3);display:flex;align-items:center;justify-content:center;animation:pulseRing 2s ease-in-out infinite;margin:0 auto;transition:border-color .4s ease}
.scroll-hint .arrow-ring svg{animation:bounceDown 2s ease-in-out infinite}
.scroll-hint .hint-text{font-size:.72rem;color:var(--text3);letter-spacing:.04em;margin-top:.4rem;font-weight:400}
@keyframes fadeInHint{from{opacity:0}to{opacity:1}}
@keyframes pulseRing{0%,100%{border-color:var(--text5);box-shadow:0 0 0 0 var(--accent-glow)}50%{border-color:var(--accent);box-shadow:0 0 16px 4px var(--accent-glow)}}
@keyframes bounceDown{0%,100%{transform:translateY(0)}50%{transform:translateY(6px)}}

.lang-switch.active{background:rgba(0,122,255,.2)!important;border-color:#0071ED!important;color:#fff!important}

.mobile-nav-right{display:flex;align-items:center;gap:.5rem}

@media(max-width:768px){
  .nav{padding:0 1rem;height:48px}
  .nav-links{display:none!important}
  .hero{padding:5rem 1rem 3rem;justify-content:center}
  .hero h1{font-size:2.2rem}
  .hero p{font-size:.95rem}
  .tool-grid{grid-template-columns:repeat(2,1fr);gap:.65rem}
  .tool-card{padding:1rem;border-radius:14px}
  .tool-card .card-icon{width:34px;height:34px;border-radius:10px;font-size:1.1rem;margin-bottom:.5rem}
  .tool-card h3{font-size:.82rem}
  .tool-card .card-desc{font-size:.7rem}
  .section{padding:2.5rem 1rem}
  .section-label{margin-bottom:1rem}
  .tool-header{padding:4.5rem 1rem 1.5rem}
  .tool-header h1{font-size:1.6rem}
  .tool-body{padding:0 1rem 3rem}
  .control-row{flex-direction:column;align-items:stretch}
  .upload-zone{padding:2rem 1rem}
  .preview-row{flex-direction:column}
  .ad-slot{padding:1rem;margin:1.5rem .5rem}
  .scroll-hint{bottom:1.2rem}
  .scroll-hint .arrow-ring{width:40px;height:40px}
  .scroll-hint .hint-text{font-size:.68rem}
  .site-footer{padding:2rem 1rem}
  .footer-links{flex-wrap:wrap;gap:1rem}
  input[type=range]{width:100%}
  .carousel-wrap{max-width:300px;height:110px}
}
@media(max-width:400px){
  .tool-grid{grid-template-columns:1fr 1fr;gap:.5rem}
  .tool-card{padding:.85rem;border-radius:12px}
  .tool-card h3{font-size:.78rem}
}