/* ============================================================
   AiPOS AI — Universal Design Engine (design-system.css)
   Phase 1 · v1.0 · 2026-07-10
   Include this file in every tool's <head>, AFTER any page-specific
   <style> reset but BEFORE page-specific overrides, e.g.:
   <link rel="stylesheet" href="design-system.css">
   ============================================================ */

/* ---------- 1. THEME TOKENS (single source of truth) ---------- */
:root{
  --bg:#050810; --s1:#0a0f1e; --s2:#0f1628; --s3:#151e35;
  --border:#1a2840; --border2:#243450;
  --cyan:#00f0ff; --violet:#7c5cfc; --amber:#ffb800;
  --green:#00e096; --red:#ff4466;
  --text:#eef2ff; --muted:#6b80a8; --muted2:#4a6080;
  --radius:14px; --radius-sm:8px;
  --shadow-card:0 16px 40px rgba(0,0,0,.35);
  --shadow-hover:0 20px 50px rgba(0,240,255,.12);
}

/* Unified light mode — always toggled via data-theme="light" on <html>,
   saved to localStorage key "aipos_theme". Do NOT use body.light anymore. */
:root[data-theme="light"]{
  --bg:#f4f6fb; --s1:#ffffff; --s2:#eef1f8; --s3:#e6e9f2;
  --border:#dbe0ec; --border2:#c9d2e5;
  --cyan:#0891b2; --violet:#6d4ceb; --amber:#b45f06;
  --green:#0d9467; --red:#d93054;
  --text:#1a2440; --muted:#5c6785; --muted2:#7c88a5;
  --shadow-card:0 12px 30px rgba(20,30,60,.08);
  --shadow-hover:0 16px 40px rgba(8,145,178,.1);
}

*{box-sizing:border-box}
body{font-family:'DM Sans',sans-serif;background:var(--bg);color:var(--text);transition:background .3s,color .3s}
a{text-decoration:none;color:inherit}
::-webkit-scrollbar{width:4px}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}

/* ---------- 2. UNIVERSAL TOPBAR + LOGO ---------- */
.aipos-topbar{
  background:var(--s1); border-bottom:1px solid var(--border);
  padding:0 14px; height:56px; display:flex; align-items:center;
  justify-content:space-between; flex-shrink:0; position:sticky; top:0; z-index:100; gap:8px;
}
.aipos-logo{display:flex;align-items:center;gap:8px;flex-shrink:0}
.aipos-logo-anim{position:relative;width:36px;height:36px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.aipos-logo-ring{position:absolute;width:36px;height:36px;animation:aiposSpin 4s linear infinite}
.aipos-logo-ring svg{width:36px;height:36px}
.aipos-logo-circle{
  position:absolute;width:24px;height:24px;border-radius:50%;
  background:radial-gradient(circle at 40% 35%,#1a1060,#0a0520);
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 0 10px rgba(108,99,255,.7); z-index:2;
}
.aipos-brand{
  font-family:'Bricolage Grotesque',sans-serif;font-size:15px;font-weight:800;
  background:linear-gradient(135deg,var(--cyan),var(--violet));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
  white-space:nowrap;
}
:root[data-theme="light"] .aipos-brand{-webkit-text-fill-color:initial;color:transparent}
@keyframes aiposSpin{to{transform:rotate(360deg)}}
@keyframes aiposPulse{0%,100%{filter:drop-shadow(0 0 5px #6c63ff)}50%{filter:drop-shadow(0 0 12px #00d4aa)}}

/* Scrollable button row — required on every topbar per mobile standard */
.aipos-btn-row{
  display:flex; align-items:center; gap:6px; flex-wrap:nowrap;
  overflow-x:auto; scrollbar-width:none; -webkit-overflow-scrolling:touch; min-width:0;
}
.aipos-btn-row::-webkit-scrollbar{display:none}
.aipos-btn-row .tbtn{flex-shrink:0}

/* ---------- 3. UNIVERSAL BUTTONS ---------- */
.tbtn{
  padding:7px 12px;border-radius:var(--radius-sm);font-size:11px;font-weight:700;
  border:none;cursor:pointer;font-family:inherit;white-space:nowrap;transition:.2s;
}
.tp{background:linear-gradient(135deg,var(--cyan),var(--violet));color:var(--bg)} /* primary */
.tg{background:rgba(0,224,150,.12);border:1px solid rgba(0,224,150,.25);color:var(--green)} /* success/premium */
.to{background:transparent;border:1px solid var(--border);color:var(--muted)} /* outline */
.to:hover{border-color:var(--cyan);color:var(--cyan)}
.theme-btn{
  width:36px;height:36px;border-radius:var(--radius-sm);background:var(--s2);
  border:1px solid var(--border);display:flex;align-items:center;justify-content:center;
  cursor:pointer;font-size:16px;flex-shrink:0;
}

/* ---------- 4. ONE-TOUCH PRIMARY ACTION ---------- */
/* Every tool should have exactly ONE .aipos-cta as the dominant action */
.aipos-cta{
  padding:14px 28px;border-radius:var(--radius);border:none;cursor:pointer;
  font-family:inherit;font-size:15px;font-weight:800;
  background:linear-gradient(135deg,var(--cyan),var(--violet));color:var(--bg);
  box-shadow:0 10px 30px rgba(0,240,255,.25);
  transition:transform .25s cubic-bezier(.34,1.56,.64,1),box-shadow .25s;
}
.aipos-cta:active{transform:scale(.97)}
.aipos-cta:hover{transform:translateY(-2px);box-shadow:0 14px 36px rgba(0,240,255,.35)}

/* ---------- 5. LIGHTWEIGHT 3D CARD (perf-safe, no WebGL) ---------- */
/* Use on tool cards / feature cards for the "premium depth" look
   without the mobile performance cost of Three.js/WebGL. */
.aipos-3d-card{
  background:linear-gradient(145deg,var(--s1),var(--s2));
  border:1px solid var(--border); border-radius:var(--radius);
  padding:24px; position:relative; overflow:hidden;
  box-shadow:var(--shadow-card);
  transform-style:preserve-3d;
  transition:transform .35s cubic-bezier(.34,1.56,.64,1),box-shadow .35s,border-color .3s;
}
.aipos-3d-card::before{
  content:"";position:absolute;inset:0;border-radius:inherit;
  background:linear-gradient(135deg,rgba(0,240,255,.05),rgba(124,92,252,.05));
  opacity:0;transition:opacity .3s;
}
.aipos-3d-card:hover{
  transform:translateY(-8px) rotateX(2deg) rotateY(-2deg) scale(1.02);
  border-color:var(--cyan); box-shadow:var(--shadow-hover);
}
.aipos-3d-card:hover::before{opacity:1}
/* Disable the tilt on touch devices — hover-3D looks glitchy on tap, and
   respects users who set reduced motion */
@media (hover:none){ .aipos-3d-card:hover{transform:translateY(-4px)} }
@media (prefers-reduced-motion:reduce){
  .aipos-3d-card, .aipos-cta, .aipos-logo-ring{transition:none;animation:none}
}

/* ---------- 6. RESPONSIVE ---------- */
@media (max-width:640px){
  .aipos-topbar{padding:0 10px;height:52px}
  .aipos-brand{font-size:13px}
  .aipos-cta{width:100%;padding:14px 20px}
}
