:root {
  --ink: #15202b;
  --ink-soft: #3d4f5f;
  --paper: #e8eef2;
  --paper-2: #f4f7f9;
  --teal: #1f6f6a;
  --teal-deep: #14524e;
  --line: rgba(21, 32, 43, 0.12);
  --warn: #8a4b12;
  --radius: 2px;
  --font-brand: "Unbounded", system-ui, sans-serif;
  --font-body: "Manrope", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  color: var(--ink);
  font-family: var(--font-body);
  background: var(--paper);
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(900px 500px at 12% -10%, rgba(31, 111, 106, 0.18), transparent 60%),
    radial-gradient(700px 420px at 100% 0%, rgba(21, 32, 43, 0.1), transparent 55%),
    linear-gradient(165deg, #d9e4ea 0%, #eef3f6 42%, #e3ebe8 100%);
  background-attachment: fixed;
}
.atmosphere::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.45'/%3E%3C/svg%3E");
  pointer-events: none;
}

.top {
  max-width: 1080px;
  margin: 0 auto;
  padding: 1.25rem 1.25rem 0;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  font-family: var(--font-brand);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
}

.tag {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.88rem;
  max-width: 22rem;
  text-align: right;
}

main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

.hero {
  min-height: min(72vh, 640px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 2rem 0 3rem;
  animation: rise 0.7s ease both;
}

.brand-hero {
  margin: 0;
  font-family: var(--font-brand);
  font-weight: 700;
  font-size: clamp(2.6rem, 8vw, 4.4rem);
  letter-spacing: -0.04em;
  line-height: 1;
}

.lead {
  margin: 0;
  max-width: 28rem;
  font-size: 1.12rem;
  line-height: 1.45;
  color: var(--ink-soft);
  animation: rise 0.7s ease 0.08s both;
}

.drop {
  margin-top: 1rem;
  width: min(100%, 420px);
  padding: 1.6rem 1.4rem;
  border: 1.5px dashed rgba(21, 32, 43, 0.35);
  background: rgba(244, 247, 249, 0.72);
  backdrop-filter: blur(6px);
  cursor: pointer;
  transition: border-color 0.2s, transform 0.2s, background 0.2s;
  animation: rise 0.7s ease 0.16s both;
}

.drop:hover,
.drop.dragover {
  border-color: var(--teal);
  background: rgba(255, 255, 255, 0.8);
  transform: translateY(-2px);
}

.drop-title {
  display: block;
  font-weight: 600;
  font-size: 1.05rem;
}

.drop-sub {
  display: block;
  margin-top: 0.35rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.status {
  min-height: 1.4rem;
  margin: 0.4rem 0 0;
  color: var(--teal-deep);
  font-size: 0.95rem;
}

.workspace {
  animation: rise 0.55s ease both;
}

.workspace.hidden,
.hidden { display: none !important; }

.workspace-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2.5rem;
  align-items: start;
}

h2 {
  margin: 0 0 0.35rem;
  font-family: var(--font-brand);
  font-size: 1.35rem;
  letter-spacing: -0.03em;
}

.panel-note {
  margin: 0 0 1rem;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.hints {
  margin: 0 0 1.25rem;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.4rem;
}

.hints:empty { display: none; }

.hints li {
  padding: 0.55rem 0.7rem;
  border-left: 3px solid var(--warn);
  background: rgba(138, 75, 18, 0.08);
  font-size: 0.9rem;
  color: var(--warn);
}

form {
  display: grid;
  gap: 0.75rem;
}

label {
  display: grid;
  gap: 0.3rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-soft);
  letter-spacing: 0.01em;
}

input, textarea {
  width: 100%;
  border: none;
  border-bottom: 1.5px solid var(--line);
  border-radius: var(--radius);
  background: transparent;
  padding: 0.55rem 0.15rem;
  font: inherit;
  font-weight: 500;
  color: var(--ink);
  font-size: 0.98rem;
  transition: border-color 0.15s, background 0.15s;
}

input:focus, textarea:focus {
  outline: none;
  border-bottom-color: var(--teal);
  background: rgba(255, 255, 255, 0.35);
}

.row2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 0.6rem;
}

.btn {
  appearance: none;
  border: none;
  cursor: pointer;
  font: inherit;
  font-weight: 650;
  padding: 0.8rem 1.15rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s, background 0.15s, color 0.15s;
}

.btn:active { transform: translateY(1px); }

.btn.primary {
  background: var(--ink);
  color: #f5f8fa;
}

.btn.primary:hover { background: var(--teal-deep); }

.btn.secondary {
  background: var(--teal);
  color: #f5f8fa;
  margin-top: 0.85rem;
}

.btn.ghost {
  background: transparent;
  color: var(--ink-soft);
  border-bottom: 1.5px solid var(--line);
  border-radius: 0;
  padding-left: 0.2rem;
  padding-right: 0.2rem;
}

.panel-qr {
  position: sticky;
  top: 1rem;
}

.qr-frame {
  margin-top: 0.5rem;
  background: #fff;
  padding: 1rem;
  min-height: 240px;
  display: grid;
  place-items: center;
  box-shadow: 0 18px 40px rgba(21, 32, 43, 0.08);
}

.qr-frame img {
  width: min(100%, 320px);
  height: auto;
  image-rendering: pixelated;
  animation: pop 0.35s ease;
}

.qr-placeholder {
  margin: 0;
  color: var(--ink-soft);
  text-align: center;
  padding: 2rem 1rem;
}

.payload {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.payload pre {
  white-space: pre-wrap;
  word-break: break-word;
  background: rgba(255, 255, 255, 0.55);
  padding: 0.75rem;
  font-size: 0.75rem;
  line-height: 1.4;
}

footer {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.25rem 2.5rem;
  color: var(--ink-soft);
  font-size: 0.82rem;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}

@keyframes pop {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 860px) {
  .top { flex-direction: column; align-items: flex-start; }
  .tag { text-align: left; max-width: none; }
  .workspace-grid { grid-template-columns: 1fr; gap: 2rem; }
  .panel-qr { position: static; }
  .row2 { grid-template-columns: 1fr; }
  .hero { min-height: auto; padding-top: 2.5rem; }
}