:root{
  --bg:#000000;--bg-secondary:#0a0a0a;--bg-card:#111111;--bg-elevated:#171717;
  --text-primary:#ededed;--text-secondary:#888888;--text-tertiary:#666666;
  --border:rgba(255,255,255,0.08);--border-hover:rgba(255,255,255,0.15);
  --accent:#0070f3;--accent-hover:#0060df;
  --success:#0cce6b;--warning:#f5a623;--danger:#ee0000;
  --font-sans:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
  --radius-sm:6px;--radius-md:8px;--radius-lg:12px;--radius-xl:16px;--radius-full:9999px;
  --shadow-sm:0 0 0 1px var(--border),0 2px 4px rgba(0,0,0,0.3);
  --shadow-md:0 0 0 1px var(--border),0 4px 8px rgba(0,0,0,0.4);
  --shadow-lg:0 0 0 1px var(--border),0 8px 16px rgba(0,0,0,0.5);
  --shadow-focus:0 0 0 2px var(--bg),0 0 0 4px var(--accent);
  --t-fast:150ms ease;--t-base:200ms ease;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;scroll-behavior:smooth}
body{font-family:var(--font-sans);background:var(--bg);color:var(--text-primary);line-height:1.6;min-height:100vh;
  background-image:radial-gradient(ellipse 80% 50% at 50% -20%,rgba(0,112,243,0.10),transparent),
                   radial-gradient(rgba(255,255,255,0.035) 1px,transparent 1px);
  background-size:100% 100%,26px 26px;background-attachment:fixed}
a{color:var(--accent);text-decoration:none;transition:color var(--t-fast)}
a:hover{color:var(--accent-hover)}
img{max-width:100%;height:auto;display:block}
::selection{background:rgba(0,112,243,0.35)}
button,input,select{font-family:inherit}

.container{max-width:760px;margin:0 auto;padding:0 20px}

/* NAV */
.nav{position:sticky;top:0;z-index:100;height:60px;display:flex;align-items:center;
  background:rgba(0,0,0,0.72);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--border)}
.nav-inner{max-width:1100px;margin:0 auto;padding:0 20px;width:100%;display:flex;align-items:center;justify-content:space-between}
.nav-brand{display:flex;align-items:center;gap:10px;font-weight:600;font-size:15px;color:var(--text-primary)}
.nav-logo{width:30px;height:30px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.nav-logo svg{width:100%;height:100%;display:block}
.nav-link{font-size:13.5px;color:var(--text-secondary);font-weight:500}
.nav-link:hover{color:var(--text-primary)}

/* HERO */
.hero{padding:56px 0 28px;text-align:center}
.hero h1{font-size:clamp(28px,6vw,44px);font-weight:700;letter-spacing:-0.035em;line-height:1.12;margin-bottom:14px}
.hero h1 .grad{background:linear-gradient(100deg,#0070f3,#00c6ff 55%,#7c3aed);-webkit-background-clip:text;
  background-clip:text;-webkit-text-fill-color:transparent}
.hero p{font-size:16px;color:var(--text-secondary);max-width:540px;margin:0 auto}

/* CARD */
.card{background:var(--bg-card);border-radius:var(--radius-xl);box-shadow:var(--shadow-sm);padding:22px;
  transition:box-shadow var(--t-base)}
.card:hover{box-shadow:var(--shadow-md)}
.main-card{margin-top:28px;padding:24px}

/* TABS */
.tabs{display:flex;gap:4px;padding:4px;background:var(--bg);border-radius:var(--radius-lg);
  box-shadow:0 0 0 1px var(--border);margin-bottom:20px}
.tab{flex:1;display:flex;align-items:center;justify-content:center;gap:8px;height:42px;border-radius:var(--radius-md);
  border:none;background:transparent;color:var(--text-secondary);font:500 14px var(--font-sans);cursor:pointer;
  transition:all var(--t-fast);-webkit-tap-highlight-color:transparent}
.tab:hover{color:var(--text-primary)}
.tab.active{background:var(--bg-elevated);color:var(--text-primary);box-shadow:0 1px 3px rgba(0,0,0,0.4)}
.tab svg{width:16px;height:16px}

/* FORM */
.field{display:flex;flex-direction:column;gap:8px}
.input-wrap{position:relative;display:flex;align-items:center}
.input,.select{width:100%;height:50px;padding:0 15px 0 44px;background:var(--bg);border:1px solid var(--border);
  border-radius:var(--radius-lg);color:var(--text-primary);font:15px var(--font-sans);transition:border-color var(--t-fast)}
.select{padding-left:15px;appearance:none;cursor:pointer;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23666' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 16px center}
.input:focus,.select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(0,112,243,0.15)}
.input::placeholder{color:var(--text-tertiary)}
.input-icon{position:absolute;left:15px;color:var(--text-tertiary);pointer-events:none;display:flex}
.input-icon svg{width:18px;height:18px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:50px;padding:0 22px;
  border-radius:var(--radius-lg);border:1px solid var(--border);background:transparent;color:var(--text-primary);
  font:500 15px var(--font-sans);cursor:pointer;transition:all var(--t-fast);
  -webkit-tap-highlight-color:transparent;white-space:nowrap}
.btn:hover{background:var(--bg-elevated)}
.btn:focus-visible{outline:none;box-shadow:var(--shadow-focus)}
.btn-primary{background:var(--text-primary);color:var(--bg);border-color:transparent}
.btn-primary:hover{background:#ccc}
.btn-block{width:100%;margin-top:16px}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn-sm{height:38px;padding:0 14px;font-size:13.5px}
.btn-ghost{border-color:transparent}
.btn-ghost:hover{background:var(--bg-elevated)}
.hint{font-size:12.5px;color:var(--text-tertiary);margin-top:10px;text-align:center;line-height:1.5}

/* ALERT */
.alert{display:none;gap:10px;padding:13px 15px;border-radius:var(--radius-lg);margin-top:16px;font-size:14px;align-items:flex-start}
.alert.show{display:flex}
.alert-error{background:rgba(238,0,0,0.09);box-shadow:inset 0 0 0 1px rgba(238,0,0,0.3);color:#ff8080}
.alert-info{background:rgba(0,112,243,0.09);box-shadow:inset 0 0 0 1px rgba(0,112,243,0.3);color:#79b8ff}

/* OPTIONS GRID */
.opts{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:18px}
.opt{display:flex;flex-direction:column;gap:7px}
.opt label{font-size:12.5px;font-weight:500;color:var(--text-secondary);
  text-transform:uppercase;letter-spacing:.04em}
.opt .input,.opt .select{height:44px;padding-left:13px;font-size:14px}
.opt-full{grid-column:1/-1}

/* RANGE */
.range-row{display:flex;align-items:center;gap:12px}
input[type=range]{-webkit-appearance:none;appearance:none;flex:1;height:4px;border-radius:2px;
  background:var(--border);outline:none;cursor:pointer}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:18px;height:18px;border-radius:50%;
  background:var(--accent);cursor:pointer;box-shadow:0 0 0 3px rgba(0,112,243,0.2)}
input[type=range]::-moz-range-thumb{width:18px;height:18px;border:none;border-radius:50%;
  background:var(--accent);cursor:pointer}
.range-val{font:500 13.5px var(--font-mono);color:var(--text-primary);min-width:44px;text-align:right}
.range-off{opacity:.4;pointer-events:none}

/* RESULT */
.result{display:none;margin-top:16px}
.result.show{display:block}
.preview-box{background:var(--bg);border-radius:var(--radius-lg);box-shadow:inset 0 0 0 1px var(--border);
  padding:14px;display:flex;align-items:center;justify-content:center;min-height:150px;overflow:hidden}
.preview-box img{max-height:280px;width:auto;border-radius:var(--radius-md)}
.meta{margin-top:14px;display:flex;flex-direction:column;gap:5px}
.meta-title{font-size:14.5px;font-weight:500;word-break:break-all}
.meta-sub{font-size:12.5px;color:var(--text-tertiary);font-family:var(--font-mono);
  display:flex;gap:10px;flex-wrap:wrap}
.meta-sub span{display:inline-flex;align-items:center;gap:5px}
.chip{padding:2px 9px;border-radius:var(--radius-full);font:500 11.5px var(--font-mono);
  background:rgba(0,112,243,0.12);color:#79b8ff;text-transform:uppercase}
.chip-ok{background:rgba(12,206,107,0.12);color:var(--success)}

/* PROGRESS */
.progress{height:4px;background:var(--border);border-radius:2px;overflow:hidden;margin-top:14px}
.progress-bar{height:100%;width:0;background:linear-gradient(90deg,#0070f3,#00c6ff);
  transition:width .3s ease;border-radius:2px}
.status-line{display:flex;align-items:center;gap:9px;margin-top:11px;font-size:13.5px;color:var(--text-secondary)}
.pulse{width:7px;height:7px;border-radius:50%;background:var(--accent);animation:pulse 1.4s ease-in-out infinite;flex-shrink:0}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.4;transform:scale(.8)}}
.spinner{width:16px;height:16px;border:2px solid rgba(0,0,0,0.2);border-top-color:var(--bg);
  border-radius:50%;animation:spin .6s linear infinite;flex-shrink:0}
@keyframes spin{to{transform:rotate(360deg)}}

/* ACTIONS */
.actions{display:none;gap:10px;margin-top:16px;flex-wrap:wrap}
.actions.show{display:flex}
.dl-btn{flex:1;min-width:180px;background:var(--text-primary);color:var(--bg);border-color:transparent;font-weight:600}
.dl-btn:hover{background:#ccc}
.file-note{font-size:12.5px;color:var(--text-tertiary);margin-top:10px;text-align:center}

/* GALLERY */
.gallery-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:18px;flex-wrap:wrap}
.gallery-count{font-size:13.5px;color:var(--text-secondary)}
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:10px;margin-top:14px;
  max-height:420px;overflow-y:auto;padding:2px}
.g-item{position:relative;background:var(--bg);border-radius:var(--radius-md);overflow:hidden;cursor:pointer;
  box-shadow:inset 0 0 0 1px var(--border);transition:box-shadow var(--t-fast),transform var(--t-fast)}
.g-item:hover{transform:translateY(-2px)}
.g-item.sel{box-shadow:inset 0 0 0 2px var(--accent)}
.g-item img{width:100%;height:96px;object-fit:cover;background:var(--bg-elevated)}
.g-badge{position:absolute;top:7px;right:7px;width:20px;height:20px;border-radius:50%;
  background:rgba(0,0,0,0.7);box-shadow:0 0 0 1.5px rgba(255,255,255,0.35);
  display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;color:#fff;
  backdrop-filter:blur(4px)}
.g-item.sel .g-badge{background:var(--accent);box-shadow:none}
.g-info{padding:7px 9px;font-size:11px;color:var(--text-tertiary);white-space:nowrap;overflow:hidden;
  text-overflow:ellipsis;font-family:var(--font-mono)}
.g-fail{background:rgba(238,0,0,0.12)!important;display:flex;align-items:center;justify-content:center;
  color:#ff8080;font-size:11px;height:96px}
.gallery::-webkit-scrollbar{width:8px}
.gallery::-webkit-scrollbar-track{background:var(--bg)}
.gallery::-webkit-scrollbar-thumb{background:var(--bg-elevated);border-radius:4px}

/* STEPS */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:34px}
.step{background:var(--bg-card);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:20px}
.step-num{font:600 12px var(--font-mono);color:var(--accent);letter-spacing:.06em;margin-bottom:9px}
.step h4{font-size:15px;font-weight:600;margin-bottom:7px}
.step p{font-size:13px;color:var(--text-secondary);line-height:1.55}

footer{border-top:1px solid var(--border);margin-top:64px;padding:28px 0}
.foot-inner{max-width:1100px;margin:0 auto;padding:0 20px;text-align:center;
  font-size:12.5px;color:var(--text-tertiary)}

@media(max-width:640px){
  .steps{grid-template-columns:1fr}
  .hero{padding:38px 0 22px}
  .main-card{padding:18px}
  .opts{grid-template-columns:1fr;gap:12px}
  .gallery{grid-template-columns:repeat(auto-fill,minmax(96px,1fr))}
  .g-item img{height:82px}
  .actions{flex-direction:column}
  .dl-btn{min-width:0;width:100%}
}