:root {
  --g-blue: #4285F4;
  --g-red: #EA4335;
  --g-yellow: #FBBC05;
  --g-green: #34A853;
  --text-primary: #202124;
  --text-secondary: #5f6368;
  --border-color: #dfe1e5;
  --btn-bg: #f8f9fa;
  --btn-bg-hover: #f1f3f4;
  --btn-border: #f8f9fa;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  font-family: 'Roboto', Arial, sans-serif;
  color: var(--text-primary);
  background: #ffffff;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Top bar */
.topbar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  padding: 20px 28px;
  font-size: 13px;
}
.topbar-right { display: flex; gap: 24px; }
.topbar-link {
  color: var(--text-primary);
  text-decoration: none;
}
.topbar-link:hover { text-decoration: underline; }

/* Center content, Google-homepage style */
.center-wrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0 20px 100px;
  text-align: center;
}

.logo {
  font-family: 'Product Sans', 'Roboto', Arial, sans-serif;
  font-size: 56px;
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 4px;
  line-height: 1.15;
}
.logo-space { display: inline-block; width: 18px; }
.l-blue { color: var(--g-blue); }
.l-red { color: var(--g-red); }
.l-yellow { color: var(--g-yellow); }
.l-green { color: var(--g-green); }

.logo-sub {
  font-size: 15px;
  color: var(--text-secondary);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 28px;
}

.search-form {
  width: 100%;
  max-width: 584px;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  height: 46px;
  padding: 0 16px;
  border: 1px solid var(--border-color);
  border-radius: 24px;
  box-shadow: none;
  transition: box-shadow 0.15s ease, border-color 0.15s ease;
}
.search-box:hover,
.search-box:focus-within {
  box-shadow: 0 1px 6px rgba(32,33,36,0.28);
  border-color: rgba(223,225,229,0);
}

.link-icon { flex: none; }

.search-input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 16px;
  color: var(--text-primary);
  background: transparent;
  min-width: 0;
}

.clear-btn {
  display: none;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 14px;
  padding: 4px;
}
.clear-btn.visible { display: inline-block; }

.btn-row {
  margin-top: 28px;
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.gbtn {
  font-family: 'Roboto', Arial, sans-serif;
  background: var(--btn-bg);
  border: 1px solid var(--btn-border);
  border-radius: 4px;
  color: var(--text-primary);
  font-size: 14px;
  padding: 0 16px;
  height: 36px;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.gbtn:hover {
  box-shadow: 0 1px 1px rgba(0,0,0,0.1);
  background: var(--btn-bg-hover);
  border-color: #dadce0;
  color: var(--text-primary);
}

#generateBtn {
  background: var(--g-blue);
  border-color: var(--g-blue);
  color: #fff;
  font-weight: 500;
}
#generateBtn:hover {
  background: #3b78e7;
  border-color: #3b78e7;
}

.hint {
  margin-top: 36px;
  font-size: 13px;
  color: var(--text-secondary);
  max-width: 420px;
}

.footer-lang {
  margin-top: 60px;
  font-size: 12px;
  color: #b0b3b8;
}

/* Result view */
.result-wrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 40px 20px 80px;
}

.back-btn {
  align-self: flex-start;
  margin-left: max(4vw, 20px);
  background: none;
  border: none;
  color: var(--g-blue);
  font-size: 14px;
  cursor: pointer;
  margin-bottom: 30px;
  padding: 8px 4px;
}
.back-btn:hover { text-decoration: underline; }

.result-card {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 40px;
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 40px 48px;
  max-width: 620px;
  width: 100%;
}

.qr-stage {
  width: 220px;
  height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 12px;
  background: #fff;
  flex: none;
}
.qr-stage img, .qr-stage canvas {
  width: 100% !important;
  height: 100% !important;
}

.result-info {
  flex: 1;
  min-width: 200px;
  text-align: left;
}

.result-label {
  font-size: 20px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.result-link {
  font-size: 13px;
  color: var(--text-secondary);
  word-break: break-all;
  margin-bottom: 14px;
}

.download-status {
  font-size: 13px;
  color: var(--g-green);
  margin-bottom: 18px;
}
.download-status.error { color: var(--g-red); }

/* Footer */
.site-footer {
  background: #f2f2f2;
  color: var(--text-secondary);
  font-size: 13px;
  padding: 16px 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  text-align: center;
}
.footer-brand {
  font-weight: 500;
  color: var(--text-primary);
}
.footer-contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.footer-item { color: var(--text-secondary); }
.footer-email {
  color: var(--g-blue);
  text-decoration: none;
}
.footer-email:hover { text-decoration: underline; }
.footer-dot { color: #ccc; }

/* Responsive */
@media (max-width: 520px) {
  .logo { font-size: 40px; }
  .logo-space { width: 10px; }
  .btn-row { gap: 8px; }
  .result-card { padding: 28px 20px; gap: 24px; }
  .qr-stage { width: 180px; height: 180px; }
}