/* ============================================================
   UNIVERSAL TOOL INTERFACE — Reusable Shell
   Drop this into ANY tool. Only structure, no logic.
   ============================================================ */

:root{
  /* Brand */
  --brand:#2563eb; --brand-dark:#1e40af; --brand-light:#dbeafe;
  --accent:#8b5cf6; --accent-light:#ede9fe;
  --success:#10b981; --success-light:#d1fae5;
  --warning:#f59e0b; --warning-light:#fef3c7;
  --danger:#ef4444; --danger-light:#fee2e2;
  --pink:#ec4899; --pink-light:#fce7f3;
  --cyan:#06b6d4; --cyan-light:#cffafe;

  /* Neutrals */
  --ink:#0f172a; --ink-2:#1e293b; --muted:#64748b; --muted-2:#94a3b8;
  --line:#e2e8f0; --line-2:#cbd5e1; --bg:#f8fafc; --paper:#ffffff;

  /* Tokens */
  --radius-sm:8px; --radius:12px; --radius-lg:16px;
  --shadow-sm:0 1px 2px rgba(15,23,42,.06);
  --shadow:0 4px 12px rgba(15,23,42,.08);
  --shadow-lg:0 12px 32px rgba(15,23,42,.12);
  --font-sans:'Inter',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',monospace;
}

[data-theme="dark"]{
  --ink:#f8fafc; --ink-2:#e2e8f0; --muted:#94a3b8; --muted-2:#64748b;
  --line:#1e293b; --line-2:#334155; --bg:#0f172a; --paper:#1e293b;
  --brand-light:#1e3a8a33; --accent-light:#5b21b633;
  --success-light:#065f4633; --warning-light:#b4530933; --danger-light:#991b1b33;
  --pink-light:#9d174d33; --cyan-light:#155e7533;
}

*{box-sizing:border-box;margin:0;padding:0}
body{
  font-family:var(--font-sans); background:var(--bg); color:var(--ink);
  line-height:1.5; -webkit-font-smoothing:antialiased;
  transition:background .3s,color .3s;
}
img{max-width:100%;display:block}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer;border:none;background:none}

.ut-shell{max-width:1360px;margin:0 auto;padding:24px}

/* ═══════════════════════════════════════════
   TOP BAR
   ═══════════════════════════════════════════ */
.ut-topbar{
  position:relative;display:flex;align-items:center;gap:16px;padding:14px 18px;min-height:66px;
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius-lg);
  margin-bottom:20px;box-shadow:var(--shadow-sm);
}
.ut-brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:32px;position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);white-space:nowrap}
.ut-brand-icon{
  width:36px;height:36px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--brand),var(--accent));
  color:#fff;border-radius:var(--radius-sm);font-size:16px;flex-shrink:0;
}
.ut-topbar-spacer{flex:1}
.ut-icon-btn{
  width:38px;height:38px;display:grid;place-items:center;
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius-sm);
  color:var(--muted);transition:all .2s;font-size:14px;
}
.ut-icon-btn:hover{color:var(--brand);border-color:var(--brand);background:var(--brand-light)}

/* ═══════════════════════════════════════════
   WORKSPACE (2-COLUMN)
   ═══════════════════════════════════════════ */
.ut-workspace{
  display:grid;grid-template-columns:minmax(0,1fr) 380px;
  gap:20px;margin-bottom:20px;
}

/* ─── LEFT: Stage / Preview ─── */
.ut-stage{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:20px;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;min-height:560px;
}
.ut-stage-header{
  display:flex;align-items:center;justify-content:space-between;
  padding-bottom:14px;border-bottom:1px solid var(--line);margin-bottom:20px;
}
.ut-stage-title{
  font-size:12px;font-weight:600;color:var(--muted);letter-spacing:.08em;
  text-transform:uppercase;font-family:var(--font-mono);display:flex;align-items:center;gap:8px;
}
.ut-status-pill{
  display:inline-flex;align-items:center;gap:6px;padding:5px 12px;border-radius:999px;
  font-size:11px;font-weight:600;font-family:var(--font-mono);letter-spacing:.05em;
  background:var(--line);color:var(--muted);transition:all .3s;
}
.ut-status-pill[data-state="ready"]{background:var(--success-light);color:#047857}
.ut-status-pill[data-state="error"]{background:var(--danger-light);color:#b91c1c}
.ut-status-pill[data-state="working"]{background:var(--warning-light);color:#b45309}
.ut-status-dot{width:6px;height:6px;border-radius:50%;background:currentColor;animation:pulse 1.5s infinite}
.ut-status-pill[data-state="idle"] .ut-status-dot{animation:none}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}

/* Stage content wrapper — plug your tool here */
.ut-stage-body{
  flex:1;display:grid;place-items:center;padding:32px;
  background:
    radial-gradient(circle at 20% 20%,var(--brand-light) 0%,transparent 40%),
    radial-gradient(circle at 80% 80%,var(--accent-light) 0%,transparent 40%),
    var(--bg);
  border-radius:var(--radius);border:1px dashed var(--line-2);
}

/* Empty State (reusable) */
.ut-empty{text-align:center;max-width:320px}
.ut-empty-icon{
  width:72px;height:72px;margin:0 auto 20px;display:grid;place-items:center;
  background:var(--paper);border:1px solid var(--line);border-radius:50%;
  font-size:30px;color:var(--brand);box-shadow:var(--shadow);
}
.ut-empty h2{font-size:20px;font-weight:700;margin-bottom:8px}
.ut-empty p{color:var(--muted);font-size:14px;margin-bottom:16px}
.ut-empty-hint{
  display:inline-flex;align-items:center;gap:6px;padding:6px 14px;
  background:var(--brand-light);color:var(--brand-dark);border-radius:999px;
  font-size:11px;font-weight:600;font-family:var(--font-mono);
}

/* Result Card (reusable) */
.ut-result{
  width:100%;max-width:560px;background:var(--paper);border:1px solid var(--line);
  border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);
  animation:fadeUp .3s ease;
}
@keyframes fadeUp{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.ut-result-label{
  font-size:10px;font-weight:700;color:var(--brand);letter-spacing:.12em;
  text-transform:uppercase;font-family:var(--font-mono);margin-bottom:12px;
}
.ut-result-main{
  display:flex;align-items:baseline;gap:12px;padding-bottom:20px;
  border-bottom:1px solid var(--line);margin-bottom:20px;flex-wrap:wrap;
}
.ut-result-value{font-size:48px;font-weight:800;letter-spacing:-.03em;line-height:1}
.ut-result-unit{font-size:16px;color:var(--muted);font-weight:500}
.ut-result-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.ut-result-cell{padding:12px;background:var(--bg);border-radius:var(--radius-sm)}
.ut-result-cell span{
  display:block;font-size:9px;font-weight:700;color:var(--muted);
  letter-spacing:.1em;text-transform:uppercase;font-family:var(--font-mono);margin-bottom:6px;
}
.ut-result-cell strong{font-size:14px;word-break:break-word}

/* ─── RIGHT: Controls Panel ─── */
.ut-controls{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:20px;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;gap:20px;
  height:fit-content;position:sticky;top:24px;
}
.ut-control-group{display:flex;flex-direction:column;gap:12px}
.ut-group-label{
  display:flex;align-items:center;gap:8px;font-size:11px;font-weight:700;
  color:var(--muted);letter-spacing:.08em;text-transform:uppercase;font-family:var(--font-mono);
}
.ut-group-num{
  display:inline-grid;place-items:center;width:20px;height:20px;
  background:var(--ink);color:var(--paper);border-radius:50%;font-size:10px;
}
.ut-field{display:flex;flex-direction:column;gap:6px}
.ut-field-label{font-size:12px;font-weight:600;color:var(--ink-2)}
.ut-input-wrap{position:relative;display:flex;align-items:center}
.ut-input,.ut-select,.ut-textarea{
  width:100%;padding:11px 14px;background:var(--bg);border:1px solid var(--line);
  border-radius:var(--radius-sm);font-size:14px;font-family:var(--font-mono);
  color:var(--ink);transition:all .2s;appearance:none;
}
.ut-textarea{font-family:var(--font-sans);resize:vertical;min-height:80px}
.ut-input:focus,.ut-select:focus,.ut-textarea:focus{
  outline:none;border-color:var(--brand);background:var(--paper);
  box-shadow:0 0 0 3px var(--brand-light);
}
.ut-input-suffix{
  position:absolute;right:12px;font-size:12px;font-weight:600;color:var(--muted);
  font-family:var(--font-mono);pointer-events:none;
}
.ut-select{
  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='%2364748b' stroke-width='3'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 14px center;padding-right:40px;cursor:pointer;
}
.ut-field-row{display:grid;grid-template-columns:1fr 1fr;gap:10px}

/* Buttons */
.ut-actions{display:grid;grid-template-columns:1fr auto;gap:8px}
.ut-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 18px;border-radius:var(--radius-sm);font-size:14px;
  font-weight:600;font-family:var(--font-sans);transition:all .2s;white-space:nowrap;
}
.ut-btn-primary{
  background:linear-gradient(135deg,var(--brand),var(--accent));color:#fff;
  box-shadow:0 4px 12px rgba(37,99,235,.3);
}
.ut-btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 16px rgba(37,99,235,.4)}
.ut-btn-primary:active{transform:translateY(0)}
.ut-btn-secondary{background:var(--bg);color:var(--ink);border:1px solid var(--line)}
.ut-btn-secondary:hover{background:var(--paper);border-color:var(--line-2)}
.ut-btn-icon{width:44px;height:44px;padding:0}

/* Info note */
.ut-note{
  display:flex;align-items:flex-start;gap:8px;padding:12px;
  background:var(--brand-light);border-radius:var(--radius-sm);
  font-size:11px;color:var(--brand-dark);line-height:1.5;
}
.ut-note i{margin-top:2px;flex-shrink:0}

/* ═══════════════════════════════════════════
   SECTION HEADERS (reusable for Features/FAQ)
   ═══════════════════════════════════════════ */
.ut-section{padding:48px 0 24px}
.ut-section-head{text-align:center;margin-bottom:36px}
.ut-section-eyebrow{
  display:inline-block;padding:4px 12px;background:var(--brand-light);color:var(--brand-dark);
  border-radius:999px;font-size:11px;font-weight:700;font-family:var(--font-mono);
  letter-spacing:.08em;text-transform:uppercase;margin-bottom:12px;
}
.ut-section-title{font-size:32px;font-weight:800;letter-spacing:-.02em;margin-bottom:10px}
.ut-section-title em{font-style:normal;color:var(--brand)}
.ut-section-sub{color:var(--muted);font-size:14px;max-width:520px;margin:0 auto}

/* ═══════════════════════════════════════════
   FEATURE CARDS
   ═══════════════════════════════════════════ */
.ut-feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.ut-feature-card{
  padding:22px;background:var(--paper);border:1px solid var(--line);
  border-radius:var(--radius);transition:all .25s;position:relative;overflow:hidden;
}
.ut-feature-card::before{
  content:'';position:absolute;top:0;left:0;right:0;height:3px;background:var(--brand);
}
.ut-feature-card:nth-child(2)::before{background:var(--success)}
.ut-feature-card:nth-child(3)::before{background:var(--pink)}
.ut-feature-card:nth-child(4)::before{background:var(--accent)}
.ut-feature-card:nth-child(5)::before{background:var(--warning)}
.ut-feature-card:nth-child(6)::before{background:var(--cyan)}
.ut-feature-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.ut-feature-icon{
  width:44px;height:44px;display:grid;place-items:center;border-radius:var(--radius-sm);
  font-size:18px;margin-bottom:14px;background:var(--brand-light);color:var(--brand);
}
.ut-feature-card:nth-child(2) .ut-feature-icon{background:var(--success-light);color:var(--success)}
.ut-feature-card:nth-child(3) .ut-feature-icon{background:var(--pink-light);color:var(--pink)}
.ut-feature-card:nth-child(4) .ut-feature-icon{background:var(--accent-light);color:var(--accent)}
.ut-feature-card:nth-child(5) .ut-feature-icon{background:var(--warning-light);color:var(--warning)}
.ut-feature-card:nth-child(6) .ut-feature-icon{background:var(--cyan-light);color:var(--cyan)}
.ut-feature-card h3{font-size:15px;font-weight:700;margin-bottom:6px}
.ut-feature-card p{font-size:12.5px;color:var(--muted);line-height:1.6;margin-bottom:12px}
.ut-feature-tag{
  display:inline-block;padding:3px 10px;border-radius:999px;font-size:10px;
  font-weight:700;font-family:var(--font-mono);letter-spacing:.04em;
  background:var(--brand-light);color:var(--brand-dark);
}
.ut-feature-card:nth-child(2) .ut-feature-tag{background:var(--success-light);color:#047857}
.ut-feature-card:nth-child(3) .ut-feature-tag{background:var(--pink-light);color:#be185d}
.ut-feature-card:nth-child(4) .ut-feature-tag{background:var(--accent-light);color:#6d28d9}
.ut-feature-card:nth-child(5) .ut-feature-tag{background:var(--warning-light);color:#b45309}
.ut-feature-card:nth-child(6) .ut-feature-tag{background:var(--cyan-light);color:#0e7490}

/* ═══════════════════════════════════════════
   FAQ ACCORDION
   ═══════════════════════════════════════════ */
.ut-faq{padding:32px 0 48px}
.ut-faq-list{
  max-width:800px;margin:0 auto;display:flex;flex-direction:column;
  gap:10px;counter-reset:faq;
}
.ut-faq-item{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;transition:all .2s;
}
.ut-faq-item:hover{border-color:var(--line-2)}
.ut-faq-item summary{
  display:flex;align-items:center;gap:14px;padding:18px 20px;cursor:pointer;
  list-style:none;font-weight:600;font-size:14px;user-select:none;
}
.ut-faq-item summary::-webkit-details-marker{display:none}
.ut-faq-item summary::before{
  counter-increment:faq;content:counter(faq,decimal-leading-zero);
  display:grid;place-items:center;width:28px;height:28px;
  background:var(--brand-light);color:var(--brand-dark);border-radius:var(--radius-sm);
  font-family:var(--font-mono);font-size:11px;font-weight:700;flex-shrink:0;
}
.ut-faq-item summary::after{
  content:'+';margin-left:auto;font-size:20px;font-weight:400;
  color:var(--muted);transition:transform .25s;
}
.ut-faq-item[open] summary::after{transform:rotate(45deg);color:var(--brand)}
.ut-faq-answer{padding:0 20px 18px 62px;font-size:13.5px;color:var(--muted);line-height:1.7}

/* ═══════════════════════════════════════════
   TOAST
   ═══════════════════════════════════════════ */
.ut-toast{
  position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(100px);
  background:var(--ink);color:var(--paper);padding:12px 20px;border-radius:999px;
  font-size:13px;font-weight:600;box-shadow:var(--shadow-lg);opacity:0;
  transition:all .3s;pointer-events:none;z-index:999;
  display:flex;align-items:center;gap:8px;
}
.ut-toast.show{transform:translateX(-50%) translateY(0);opacity:1}

/* ═══════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════ */
@media(max-width:1024px){
  .ut-workspace{grid-template-columns:1fr}
  .ut-controls{position:static}
  .ut-feature-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:640px){
  .ut-shell{padding:16px}
  .ut-topbar{padding:12px 14px}
  .ut-brand span:not(.ut-brand-icon){display:none}
  .ut-stage{padding:16px;min-height:auto}
  .ut-stage-body{padding:20px}
  .ut-result-value{font-size:36px}
  .ut-result-grid{grid-template-columns:1fr}
  .ut-field-row{grid-template-columns:1fr}
  .ut-feature-grid{grid-template-columns:1fr}
  .ut-section-title{font-size:24px}
}

/* ═══════════════════════════════════════════
   UTILITY CLASSES
   ═══════════════════════════════════════════ */
.ut-hidden{display:none !important}
.ut-flex{display:flex}
.ut-gap-8{gap:8px}
.ut-mt-8{margin-top:8px}
.ut-mb-8{margin-bottom:8px}