:root {
  --bg: #f3f1ec;
  --bg-accent: #e7efe8;
  --ink: #1c2420;
  --muted: #5c675f;
  --panel: rgba(255, 255, 255, 0.82);
  --line: #d5dcd6;
  --brand: #0f5c4c;
  --brand-ink: #08362d;
  --warn: #8a5a12;
  --ok: #176b45;
  --shadow: 0 18px 40px rgba(28, 36, 32, 0.08);
  --radius: 18px;
  --font: "IBM Plex Sans", "Segoe UI", sans-serif;
  --display: "IBM Plex Serif", Georgia, serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font);
  background:
    radial-gradient(1200px 500px at 10% -10%, #d9ebe3 0%, transparent 55%),
    radial-gradient(900px 400px at 100% 0%, #efe6d4 0%, transparent 50%),
    linear-gradient(180deg, var(--bg), #ebe8e1 70%, var(--bg-accent));
}

.page {
  width: min(980px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.5rem 0 3rem;
}

.header h1 {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(2rem, 4vw, 2.8rem);
  margin: 0.35rem 0 0.6rem;
  letter-spacing: -0.02em;
}

.brand {
  margin: 0;
  color: var(--brand);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.78rem;
}

.lede,
.meta,
.hint,
.footer {
  color: var(--muted);
}

.lede {
  max-width: 42rem;
  line-height: 1.55;
  margin: 0;
}

.status-bar,
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.status-bar {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin: 1.75rem 0;
  padding: 1rem 1.25rem;
}

.status-bar .label {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 0.2rem;
}

.status-bar code {
  font-size: 0.82rem;
  word-break: break-all;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.panel {
  padding: 1.35rem 1.4rem 1.5rem;
}

.panel h2,
.session-head h2 {
  font-family: var(--display);
  margin: 0 0 0.55rem;
  font-size: 1.45rem;
}

.panel p {
  margin: 0 0 1rem;
  line-height: 1.5;
}

.form {
  display: grid;
  gap: 0.55rem;
}

label {
  font-size: 0.85rem;
  font-weight: 500;
}

select,
.btn {
  font: inherit;
}

select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.7rem 0.8rem;
  background: #fff;
  color: var(--ink);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  border: 1px solid transparent;
  padding: 0.75rem 1.15rem;
  cursor: pointer;
  text-decoration: none;
  font-weight: 600;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn.primary {
  background: var(--brand);
  color: #f4faf7;
}

.btn.primary:hover:not(:disabled) {
  background: var(--brand-ink);
}

.btn.secondary {
  background: transparent;
  border-color: var(--line);
  color: var(--brand-ink);
}

.ok {
  color: var(--ok);
}

.warn {
  color: var(--warn);
}

.hint {
  margin-top: 0.9rem;
  font-size: 0.92rem;
}

.warning-panel {
  margin-bottom: 1rem;
  border-color: #e0c48a;
  background: rgba(255, 248, 230, 0.95);
}

.warning-panel h2 {
  color: var(--warn);
}

.warning-panel ol {
  margin: 0 0 0.75rem;
  padding-left: 1.2rem;
  color: var(--ink);
  line-height: 1.55;
}

.session {
  margin-top: 1rem;
}

.session.hidden {
  display: none;
}

.session-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-top: 1rem;
  justify-items: center;
}

.session-complete .session-body {
  justify-items: stretch;
}

.session-body:has(.qr-wrap:not(.hidden)):has(.result:not(.hidden)) {
  grid-template-columns: 280px 1fr;
  justify-items: stretch;
}

.qr-wrap.hidden,
.result.hidden {
  display: none;
}

.qr-wrap {
  display: grid;
  justify-items: center;
  gap: 1.5rem;
  text-align: center;
}

#qr-canvas {
  background: #fff;
  border-radius: 16px;
  padding: 0.75rem;
  border: 1px solid var(--line);
}

.qr-code {
  width: 240px;
  height: 240px;
  padding: 0.75rem;
  background: #fff;
  border-radius: 16px;
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  overflow: hidden;
}

.qr-code img,
.qr-code canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.qr-wrap .btn {
  margin-top: 0.25rem;
}

.result {
  min-width: 0;
  max-width: 100%;
  width: 100%;
}

.result pre {
  margin: 0 0 1rem;
  padding: 1rem;
  border-radius: 14px;
  background: #15201c;
  color: #dff5ea;
  overflow-x: auto;
  overflow-y: auto;
  max-width: 100%;
  box-sizing: border-box;
  min-height: 120px;
  font-size: 0.84rem;
  line-height: 1.45;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.result h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.result h3:not(:first-child) {
  margin-top: 1.25rem;
}

.footer {
  margin-top: 2rem;
  font-size: 0.9rem;
}

.footer a {
  color: var(--brand);
}

@media (max-width: 800px) {
  .status-bar,
  .grid,
  .session-body {
    grid-template-columns: 1fr;
  }
}