/* 
 * QR Code Generator Tool - Local Styles
 * Dark theme consistent with website-roo design language
 */

/* Base */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}

:root{
  --bg-primary:#0a0e17;--bg-secondary:#111827;--bg-card:#1a2235;
  --accent:#00d4ff;--accent2:#7c3aed;--accent3:#10b981;
  --text-primary:#e2e8f0;--text-secondary:#94a3b8;--text-muted:#64748b;
  --border:#1e293b;--border-light:#2d3a50;
  --gradient-start:#00d4ff;--gradient-mid:#7c3aed;--gradient-end:#ef4444;
  --card-hover:#1e2d4a;
}

html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',Roboto,sans-serif;
  background:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100vh;
  background-image:radial-gradient(ellipse at 50% 0%, rgba(0,212,255,0.06) 0%, transparent 60%);
}

a{color:var(--accent);text-decoration:none;transition:color .2s}
a:hover{color:#fff}

/* Navbar */
.navbar{
  background:linear-gradient(135deg,#0d1321 0%,#1a1f3a 100%);
  border-bottom:1px solid var(--border);
  padding:0 1rem;position:sticky;top:0;z-index:100;
  box-shadow:0 2px 20px rgba(0,0,0,.5);
}
.nav-inner{
  max-width:1200px;margin:0 auto;
  display:flex;align-items:center;justify-content:space-between;height:64px;
}
.nav-logo{
  font-size:1.3rem;font-weight:700;
  background:linear-gradient(135deg,var(--gradient-start),var(--gradient-mid));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  letter-spacing:-.5px;
}
.nav-menu{display:flex;gap:2rem;list-style:none;align-items:center}
.nav-menu li a{
  color:var(--text-secondary);font-weight:500;font-size:.95rem;
  padding:.5rem 0;position:relative;transition:color .2s;
}
.nav-menu li a:hover,.nav-menu li a.active{color:var(--accent)}
.nav-menu li a.active::after{
  content:'';position:absolute;bottom:0;left:0;right:0;
  height:2px;background:linear-gradient(90deg,var(--gradient-start),var(--gradient-mid));border-radius:1px;
}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;color:var(--text-primary);font-size:1.5rem;padding:8px}

/* Main layout */
.main-container{max-width:1200px;margin:0 auto;padding:2rem 1rem;min-height:calc(100vh - 64px)}
.page-header{text-align:center;margin-bottom:2.5rem}
.page-header h1{
  font-size:2.5rem;font-weight:800;line-height:1.2;margin-bottom:.75rem;
  background:linear-gradient(135deg,var(--gradient-start),var(--gradient-mid),var(--gradient-end));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
}
.page-header p{font-size:1.1rem;color:var(--text-secondary);max-width:600px;margin:0 auto}

/* QR Generator Card */
.tool-card{
  max-width:680px;margin:0 auto 2rem;
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:16px;padding:2.5rem;
  box-shadow:0 4px 30px rgba(0,0,0,.2);
}

/* Input area */
.input-group{margin-bottom:1.5rem}
.input-group label{
  display:block;font-size:.9rem;font-weight:600;color:var(--text-secondary);
  margin-bottom:.5rem;
}
.input-group textarea{
  width:100%;min-height:100px;padding:1rem;
  background:var(--bg-secondary);border:1px solid var(--border);
  border-radius:10px;color:var(--text-primary);font-size:1rem;
  font-family:inherit;line-height:1.5;resize:vertical;
  transition:border-color .2s,box-shadow .2s;
}
.input-group textarea:focus{
  outline:none;border-color:var(--accent);
  box-shadow:0 0 0 3px rgba(0,212,255,.1);
}
.input-group textarea::placeholder{color:var(--text-muted)}

/* Settings row */
.settings-row{
  display:flex;flex-wrap:wrap;gap:1rem;align-items:flex-end;
  margin-bottom:1.5rem;
}
.settings-group{flex:1;min-width:140px}
.settings-group label{
  display:block;font-size:.8rem;font-weight:600;color:var(--text-muted);
  margin-bottom:.4rem;text-transform:uppercase;letter-spacing:.5px;
}
.settings-group select,.settings-group input{
  width:100%;padding:.6rem .8rem;
  background:var(--bg-secondary);border:1px solid var(--border);
  border-radius:8px;color:var(--text-primary);font-size:.9rem;
  font-family:inherit;cursor:pointer;transition:border-color .2s;
}
.settings-group select:focus,.settings-group input:focus{
  outline:none;border-color:var(--accent);
}
.settings-group input[type="color"]{
  height:42px;padding:4px;cursor:pointer;
}

/* Generate button */
.generate-btn{
  display:block;width:100%;padding:14px 32px;
  font-size:1.05rem;font-weight:700;letter-spacing:1px;
  border:none;border-radius:10px;cursor:pointer;
  background:linear-gradient(135deg,var(--gradient-start),var(--gradient-mid));
  color:#fff;transition:all .3s;
  box-shadow:0 4px 20px rgba(0,212,255,.25);
  position:relative;overflow:hidden;
}
.generate-btn:hover{transform:translateY(-2px);box-shadow:0 6px 30px rgba(0,212,255,.35)}
.generate-btn:active{transform:translateY(0)}
.generate-btn:disabled{opacity:.6;cursor:not-allowed;transform:none}

/* QR Code display area */
.qr-display-area{
  display:none;margin-top:2rem;padding-top:2rem;
  border-top:1px solid var(--border);
  text-align:center;
}
.qr-display-area.visible{display:block}
.qr-wrapper{
  display:inline-block;padding:1.5rem;
  background:#fff;border-radius:16px;
  box-shadow:0 4px 20px rgba(0,0,0,.3);
  margin-bottom:1.5rem;
}
.qr-wrapper #qrcode{display:inline-block}
.qr-wrapper #qrcode img,.qr-wrapper #qrcode canvas{display:block;margin:0 auto}

/* Download buttons */
.download-actions{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap}
.download-btn{
  padding:10px 28px;font-size:.9rem;font-weight:600;
  border:none;border-radius:8px;cursor:pointer;
  transition:all .2s;display:inline-flex;align-items:center;gap:8px;
}
.download-btn-primary{
  background:linear-gradient(135deg,var(--gradient-start),var(--gradient-mid));
  color:#fff;box-shadow:0 2px 10px rgba(0,212,255,.2);
}
.download-btn-primary:hover{transform:translateY(-2px);box-shadow:0 4px 20px rgba(0,212,255,.3)}
.download-btn-secondary{
  background:transparent;border:1px solid var(--accent);color:var(--accent);
}
.download-btn-secondary:hover{background:rgba(0,212,255,.1)}

/* Input feedback */
.input-hint{
  font-size:.8rem;color:var(--text-muted);margin-top:.4rem;
}
.input-error{border-color:var(--gradient-end) !important}
.error-text{color:var(--gradient-end);font-size:.85rem;margin-top:.5rem}

/* Status indicator */
.status-text{
  font-size:.9rem;color:var(--text-muted);margin-top:1rem;min-height:1.4em;
}

/* Footer */
.footer{
  text-align:center;padding:2rem;
  border-top:1px solid var(--border);
  color:var(--text-muted);font-size:.85rem;
}

/* Lang menu dropdown */
.lang-menu{
  display:none;position:fixed;top:70px;right:20px;
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:10px;padding:8px 0;z-index:200;
  box-shadow:0 4px 20px rgba(0,0,0,.5);
}
.lang-menu a{
  display:block;padding:8px 20px;color:var(--text-secondary);
  text-decoration:none;font-size:.9rem;cursor:pointer;
  transition:background .2s;
}
.lang-menu a:hover{background:rgba(255,255,255,.05);color:var(--text-primary)}

/* Responsive */
@media(max-width:768px){
  .nav-menu{
    display:none;flex-direction:column;position:absolute;top:64px;left:0;right:0;
    width:100%;background:#0d1321;padding:1rem 1.5rem;
    border-bottom:1px solid var(--border);gap:1rem;
  }
  .nav-menu.open{display:flex}
  .nav-toggle{display:block}
  .page-header h1{font-size:1.8rem}
  .tool-card{padding:1.5rem}
  .settings-row{flex-direction:column;gap:.75rem}
  .settings-group{min-width:100%}
  .download-actions{flex-direction:column;align-items:center}
  .download-btn{width:100%;justify-content:center}
}