* { box-sizing: border-box; }

:root {
  font-family: Georgia, "Times New Roman", serif;
  color: #20201e;
  background: #f3f2ee;
}

html {
  min-height: 100%;
  overflow-x: hidden;
}

body {
  margin: 0;
  min-height: 100vh;
  overflow: hidden;
  background-color: #f3f2ee;
  background-image:
    radial-gradient(circle at 50% 4%, rgba(255,255,255,.95), transparent 32%),
    linear-gradient(rgba(66,64,58,.075) 1px, transparent 1px),
    linear-gradient(90deg, rgba(66,64,58,.035) 1px, transparent 1px),
    linear-gradient(rgba(66,64,58,.038) 1px, transparent 1px),
    linear-gradient(90deg, rgba(66,64,58,.018) 1px, transparent 1px);
  background-size: auto, 48px 48px, 56px 56px, 192px 192px, 224px 224px;
  background-position: center top;
}

main {
  width: min(900px, calc(100% - 48px));
  height: 100vh;
  margin: 0 auto;
  padding: 26px 0 21px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.hero {
  padding: 9.75vh 0 5vh;
  text-align: center;
}

.hero h1 {
  margin: 0;
  color: #161614;
  font-size: clamp(54px, 9.75vw, 105px);
  line-height: .84;
  letter-spacing: -.075em;
  font-weight: 600;
}

.intro {
  max-width: 525px;
  margin: 26px auto 0;
  color: #494843;
  font-size: 19px;
  line-height: 1.45;
}

.qr-card {
  position: relative;
  width: 100%;
  min-height: 390px;
  margin-top: 18px;
  padding: 48px 32px;
  display: grid;
  place-items: center;
  text-align: center;
  background: rgba(255,255,255,.42);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid #c6c3bb;
  border-radius: 17px;
  box-shadow: 0 4px 12px rgba(32,32,30,.035), inset 0 1px 0 rgba(255,255,255,.55);
  overflow: hidden;
}

.qr-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(255,255,255,.22), transparent 55%);
  pointer-events: none;
}

.qr-content {
  position: relative;
  z-index: 1;
  display: grid;
  justify-items: center;
  gap: 30px;
}

.qr-content img {
  width: min(190px, 48vw);
  height: auto;
  display: block;
  filter: none;
}

.qr-content h2 {
  margin: 0;
  color: #161614;
  font-family: Arial, Helvetica, sans-serif;
  font-size: clamp(18px, 3.2vw, 27px);
  line-height: 1;
  font-weight: 700;
  letter-spacing: .12em;
}

footer {
  position: relative;
  margin-top: auto;
  padding-top: 30px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  color: #76736c;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 11px;
  letter-spacing: .08em;
}

.footer-meta {
  margin-left: auto;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 5px;
  text-align: right;
}

.version {
  color: #8a877f;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 9px;
  letter-spacing: .04em;
  opacity: .85;
}

/* Small ceiling lamp theme control */
.lamp-switch {
  position: fixed;
  z-index: 100;
  top: 14px;
  right: 26px;
  width: 52px;
  height: 66px;
  padding: 0;
  border: 0;
  background: transparent;
  color: #77736c;
  cursor: pointer;
}

.lamp {
  position: absolute;
  inset: 0;
}

.lamp-mount {
  position: absolute;
  top: 0;
  left: 17px;
  width: 18px;
  height: 6px;
  border: 1px solid #aaa69e;
  border-radius: 3px;
  background: #d2cfc7;
  box-shadow: 0 1px 2px rgba(32,32,30,.08);
}

.lamp-wire {
  position: absolute;
  top: 5px;
  left: 25px;
  width: 2px;
  height: 22px;
  border-radius: 2px;
  background: currentColor;
  opacity: .75;
}

.lamp-shade {
  position: absolute;
  top: 25px;
  left: 8px;
  width: 36px;
  height: 17px;
  border: 1px solid #aaa69e;
  border-radius: 18px 18px 5px 5px;
  background: #ddd9d0;
  box-shadow: 0 3px 7px rgba(32,32,30,.12);
  transition: transform 170ms ease;
}

.lamp-bulb {
  position: absolute;
  top: 39px;
  left: 20px;
  width: 12px;
  height: 12px;
  border: 1px solid #8c887f;
  border-radius: 50%;
  background: #f1eee6;
  box-shadow: 0 1px 3px rgba(32,32,30,.1);
  transition: background 180ms ease, box-shadow 180ms ease, transform 170ms ease;
}

.lamp-switch:hover .lamp-shade {
  transform: translateY(1px);
}

.lamp-switch:hover .lamp-bulb {
  box-shadow: 0 2px 7px rgba(32,32,30,.16);
}

.lamp-switch.activating .lamp-shade {
  transform: translateY(3px);
}

.lamp-switch.activating .lamp-bulb {
  transform: translateY(3px) scale(.92);
}

@media (max-width: 760px) {
  main { width: calc(100% - 27px); padding-top: 18px; }
  .hero { padding: 7vh 0 7vh; }
  .hero h1 { font-size: clamp(44px, 14.25vw, 68px); }
  .intro { font-size: 18px; max-width: 280px; margin-top: 20px; }
  .qr-card { min-height: 330px; padding: 36px 20px; margin-top: 8px; }
  .qr-content img { width: min(170px, 52vw); }
  footer { padding-top: 22px; gap: 10px; font-size: 8px; }
  .footer-meta { gap: 3px; }
  .version { font-size: 7px; }

  .lamp-switch {
    top: 9px;
    right: 13px;
    transform: scale(.86);
    transform-origin: top right;
  }
}

@media (prefers-reduced-motion: reduce) {
  .lamp-switch,
  .lamp-switch * { transition: none !important; }
}

:root[data-theme="dark"] { color-scheme: dark; }

:root[data-theme="dark"] body {
  color: #eeeDE8;
  background-color: #151513;
  background-image:
    radial-gradient(circle at 50% 4%, rgba(255,255,255,.055), transparent 32%),
    linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.018) 1px, transparent 1px),
    linear-gradient(rgba(255,255,255,.016) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.009) 1px, transparent 1px);
}

:root[data-theme="dark"] .hero h1,
:root[data-theme="dark"] .qr-content h2 { color: #f5f4ef; }

:root[data-theme="dark"] .intro,
:root[data-theme="dark"] footer { color: #918e86; }

:root[data-theme="dark"] .qr-card {
  background: rgba(255,255,255,.045);
  border-color: #3b3a35;
  box-shadow: 0 4px 12px rgba(0,0,0,.16), inset 0 1px 0 rgba(255,255,255,.12);
}

:root[data-theme="dark"] .qr-card::after {
  background: linear-gradient(120deg, rgba(255,255,255,.08), transparent 55%);
}

:root[data-theme="dark"] .lamp-switch {
  color: #aaa79f;
}

:root[data-theme="dark"] .lamp-mount,
:root[data-theme="dark"] .lamp-shade {
  border-color: #625f58;
  background: #373631;
}

:root[data-theme="dark"] .lamp-bulb {
  border-color: #8e8a82;
  background: #ddd8cb;
  box-shadow: 0 0 13px rgba(255,238,190,.34);
}

:root[data-theme="dark"] .version { color: #aaa79f; }

:root[data-theme="dark"] .qr-content img {
  filter: brightness(0) invert(1);
}