:root {
  --brand: #4056A1;
  --brand-dark: #21305A;
  --accent: #7d7ce4;
  --white: #fff;
  --footer-text: #556080;
  --footer-dark: #a0afcc;
  --input-border: #dadef7;
  --shadow: 0 2px 16px 0 #e8e9f2;
  --radius: 16px;
  --container-padding-desktop: 2.3rem;
  --container-padding-mobile: clamp(1.15rem, 8vw, 2.3rem);
}

body {
  font-family: 'Inter', 'Segoe UI', Arial, sans-serif;
  background: var(--bg, #f6f8fc);
  color: var(--fg, #1a1a1a);
  margin: 0;
  padding: 0;
  min-height: 100vh;
  transition: background 0.4s, color 0.4s;
  box-sizing: border-box;
}

main {
  max-width: 540px;
  margin: 3.2vh auto 0 auto;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2.5rem var(--container-padding-desktop) 1.6rem var(--container-padding-desktop);
  width: 100%;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

#optionsBar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.8rem;
  width: 100%;
}

h1 {
  text-align: center;
  font-family: 'Inter', 'Segoe UI', Arial, sans-serif;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--brand);
  margin: 0 0 1.3rem 0;
  font-size: 1.8rem;
}

#generator {
  display: flex;
  flex-direction: column;
  width: 100%;
  gap: 1.18rem;
}

#generator label {
  font-weight: 600;
  color: #4056a1;
  margin-bottom: 0.27rem;
  margin-top: 0.22rem;
  font-size: 1.03rem;
  letter-spacing: 0.01em;
  display: block;
}

.row-wrap {
  display: flex;
  gap: 0.92rem;
  align-items: center;
  flex-wrap: wrap;
  width: 100%;
  margin-bottom: 0.23rem;
}

input[type="text"], input[type="email"], input[type="tel"], select {
  font-size: 1.12rem;
  padding: 1.02rem 1.07rem;
  border: 1px solid var(--input-border);
  border-radius: 8px;
  margin: 0.16rem 0;
  width: 100%;
  box-sizing: border-box;
  background: #f7f8fa;
  transition: border-color 0.33s, box-shadow 0.33s, background-color 0.29s;
  will-change: border-color, box-shadow, background-color;
}
input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
select:focus {
  box-shadow: 0 0 11px 2px rgba(64,86,161,0.13);
  background-color: #fff;
  border-color: var(--brand);
  outline: none;
}

input[type="color"] {
  width: 2rem;
  height: 2rem;
  border: none;
  background: transparent;
  cursor: pointer;
  margin: 0 0.33rem;
}

button {
  font-size: 1.11rem;
  padding: 0.80rem 1.25rem;
  cursor: pointer;
  background: linear-gradient(90deg, var(--brand) 60%, var(--accent) 140%);
  color: #fff;
  border: none;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(64,86,161,0.08);
  transition: background 0.35s cubic-bezier(0.4,0,0.2,1), box-shadow 0.26s cubic-bezier(0.4,0,0.2,1), filter 0.18s;
  margin-top: 0.18rem;
  margin-bottom: 0.12rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  letter-spacing: 0.03em;
  width: 100%;
  min-height: 48px;
  max-width: 100%;
}
button:hover, button:focus {
  background: linear-gradient(90deg, var(--accent), var(--brand-dark) 120%);
  box-shadow: 0 2px 22px 6px rgba(125,124,228,0.14);
  filter: brightness(1.03);
}

#themeToggle {
  background: #ebebf5;
  border: none;
  padding: .4rem;
  border-radius: 50%;
  transition: background 0.22s, box-shadow 0.22s;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  box-shadow: 0 1.5px 8px #acb0c235;
}
#themeToggle:hover, #themeToggle:focus {
  background: #e3e3fb;
  box-shadow: 0 3px 16px #bfc3e140;
}
body.dark #themeToggle {
  background: #e8f1ff !important;
  box-shadow: 0 2px 10px #99b5e12e;
}
body.dark #themeToggle:hover,
body.dark #themeToggle:focus {
  background: #d5e6ff !important;
  box-shadow: 0 3.5px 18px #6289df3a;
}
#themeToggle img {
  display: block;
}

#qrResult {
  margin: 2.2rem 0 0.8rem 0;
  min-height: 210px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
}

.qr-card-anim {
  display: inline-block;
  padding: 15px;
  border-radius: var(--radius);
  position: relative;
  background: var(--white);
  animation: borderRainbow 3s linear infinite;
  box-shadow: 0 2px 16px 0 #dfe3f7;
}

@keyframes borderRainbow {
  0% { box-shadow: 0 0 10px 6px var(--brand), 0 0 22px 6px transparent; }
  40% { box-shadow: 0 0 18px 13px var(--accent), 0 0 24px 10px #b7b2f7; }
  70% { box-shadow: 0 0 15px 11px var(--brand-dark), 0 0 18px 6px var(--brand); }
  100% { box-shadow: 0 0 10px 6px var(--brand), 0 0 22px 6px transparent; }
}

@keyframes scanWave {
  0%   { opacity: 0; transform: translateY(-100%);}
  20%  { opacity: 1;}
  80%  { opacity: 1;}
  100% { opacity: 0; transform: translateY(110%);}
}
.qr-scan-wave {
  mix-blend-mode: lighten;
}

@media (max-width: 700px) {
  html, body {
    padding: 0;
    width: 100vw;
    overflow-x: hidden;
  }
  main {
    padding-left: var(--container-padding-mobile);
    padding-right: var(--container-padding-mobile);
    padding-top: 1.4rem;
    padding-bottom: 1.4rem;
    max-width: 100vw;
    border-radius: 0;
    margin: 0 auto;
    min-height: 100vh;
    box-shadow: none;
    gap: 1.2rem;
  }
  #generator,
  .row-wrap {
    flex-direction: column !important;
    gap: 1.08rem;
    padding: 0;
    width: 100%;
  }
  input[type="text"], input[type="email"], input[type="tel"], select {
    width: 100%;
    font-size: 1.04rem;
    margin: 0.22rem 0;
    box-sizing: border-box;
  }
  button {
    font-size: 1.13rem;
  }
  #qrResult {
    min-height: 160px;
    width: 100vw;
    justify-content: center;
    align-items: center;
    margin: 1rem 0 0.75rem 0;
    padding: 0;
    box-sizing: border-box;
  }
}

body.dark {
  --bg: #121622;
  --fg: #e2e8f0;
  --white: #22243d;
}

footer#copyright {
  text-align: center;
  margin: 1.4rem 0 0 0;
  font-size: 0.95rem;
  color: var(--footer-text);
  letter-spacing: .015em;
  border-top: 1px solid #e2e6f0;
  padding-top: .8rem;
  background: none;
  font-weight: 500;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  opacity: .91;
}
body.dark footer#copyright {
  color: var(--footer-dark);
  border-top: 1px solid #3852a0;
}
.link-wanguy {
  color: var(--brand);
  text-decoration: none;
  font-weight: 700;
  transition: color .23s;
}
.link-wanguy:hover, .link-wanguy:focus {
  color: var(--brand-dark);
  text-decoration: underline;
  filter: brightness(1.11);
}

footer#copyright span { letter-spacing: .015em; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}