/* Palette derived from the LEARN logo (crimson #B90047, blue #28638D); layout rhythm from design/DESIGN.md. */
:root {
  --crimson: #b90047;
  --crimson-press: #8f0037;
  --crimson-soft: #f7d9e3;
  --blue: #28638d;
  --blue-soft: #d8e6f1;
  --ink: #102a3f;
  --ink-2: #2b4257;
  --mute: #566a7e;
  --canvas: #ffffff;
  --canvas-soft: #f6f9fc;
  --cream: #fbf3ea;
  --hairline: #e3e8ee;
  --input-line: #9fb7cc;
  --ok: #1d6b45;
  --warn: #8a5300;
  --err: #a1002f;
  --focus: #28638d;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-1: 0 1px 3px rgba(16, 42, 63, 0.08);
  --shadow-2: 0 8px 24px rgba(16, 42, 63, 0.08), 0 2px 6px rgba(16, 42, 63, 0.04);
  --font: "Segoe UI Variable Display", "Segoe UI", "SF Pro Display", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink);
  background: var(--canvas);
}
img { max-width: 100%; height: auto; }
.num { font-variant-numeric: tabular-nums; }
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: 16px; top: -48px; z-index: 10;
  background: var(--ink); color: #fff; padding: 8px 16px; border-radius: var(--radius-md);
}
.skip-link:focus { top: 12px; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }

/* ---------- gradient mesh hero ---------- */
.mesh {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: linear-gradient(180deg, #fff 0%, var(--cream) 100%);
}
.mesh::before, .mesh::after {
  content: "";
  position: absolute;
  inset: -40% -20%;
  z-index: -1;
  pointer-events: none;
  will-change: transform;
}
.mesh::before {
  background:
    radial-gradient(40% 45% at 18% 30%, rgba(185, 0, 71, 0.20), transparent 70%),
    radial-gradient(35% 40% at 80% 20%, rgba(40, 99, 141, 0.22), transparent 70%),
    radial-gradient(30% 35% at 60% 75%, rgba(247, 217, 227, 0.9), transparent 70%);
  animation: drift 26s ease-in-out infinite alternate;
}
.mesh::after {
  background:
    radial-gradient(30% 30% at 35% 70%, rgba(216, 230, 241, 0.9), transparent 70%),
    radial-gradient(25% 30% at 90% 65%, rgba(185, 0, 71, 0.10), transparent 70%);
  animation: drift 34s ease-in-out infinite alternate-reverse;
}
@keyframes drift {
  from { transform: translate3d(-3%, -2%, 0) rotate(0deg); }
  to { transform: translate3d(3%, 2%, 0) rotate(6deg); }
}

/* ---------- layout ---------- */
.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 768px) { .wrap { padding: 0 24px; } }

.site-header { padding: 20px 0; }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand img { display: block; width: 136px; }
@media (min-width: 768px) { .brand img { width: 168px; } }

.hero { padding: 40px 0 72px; }
@media (min-width: 768px) { .hero { padding: 64px 0 112px; } }
.eyebrow {
  display: inline-block; margin: 0 0 16px; padding: 4px 10px;
  border-radius: 9999px; background: var(--crimson-soft); color: var(--crimson-press);
  font-size: 12px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase;
}
h1 {
  margin: 0 0 16px;
  font-weight: 300;
  font-size: clamp(34px, 7vw, 56px);
  line-height: 1.06;
  letter-spacing: -0.025em;
  color: var(--ink);
  max-width: 18ch;
}
.lead { margin: 0 0 32px; font-size: 18px; font-weight: 300; color: var(--ink-2); max-width: 46ch; }

.card {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-2);
  padding: 24px;
}
@media (min-width: 768px) { .card { padding: 32px; } }

.report-card { max-width: 640px; min-height: 236px; }
.meta { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin: 0 0 24px; }
.meta div { min-width: 0; }
.meta dt { font-size: 13px; color: var(--mute); margin: 0 0 2px; }
.meta dd { margin: 0; font-size: 17px; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }

.actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; padding: 10px 20px;
  border-radius: 9999px; border: 1px solid transparent;
  font: inherit; font-size: 16px; font-weight: 500; line-height: 1;
  text-decoration: none; cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-1); }
.btn:active { transform: translateY(0); box-shadow: none; }
.btn-primary { background: var(--crimson); color: #fff; }
.btn-primary:hover { background: var(--crimson-press); }
.btn-secondary { background: var(--canvas); color: var(--blue); border-color: var(--blue); }
.btn-secondary:hover { background: var(--blue-soft); }
.btn-quiet { background: transparent; color: var(--ink-2); border-color: var(--hairline); }
.btn[disabled], .btn[aria-disabled="true"] { opacity: 0.55; cursor: not-allowed; transform: none; box-shadow: none; }
.btn svg { width: 18px; height: 18px; flex: none; }

/* ---------- states ---------- */
.skeleton { display: grid; gap: 12px; }
.skeleton span {
  display: block; height: 16px; border-radius: var(--radius-sm);
  background: linear-gradient(90deg, var(--canvas-soft) 0%, #eaf0f6 50%, var(--canvas-soft) 100%);
  background-size: 200% 100%;
  animation: shimmer 1.4s linear infinite;
}
.skeleton span:nth-child(1) { width: 60%; }
.skeleton span:nth-child(2) { width: 40%; }
.skeleton span:nth-child(3) { width: 75%; height: 44px; border-radius: 9999px; margin-top: 12px; }
@keyframes shimmer { to { background-position: -200% 0; } }

.notice { border-radius: var(--radius-md); padding: 12px 16px; margin: 0 0 16px; border: 1px solid; }
.notice p { margin: 0; }
.notice-info { background: var(--canvas-soft); border-color: var(--hairline); color: var(--ink-2); }
.notice-ok { background: #e9f6ef; border-color: #b7dfc8; color: var(--ok); }
.notice-warn { background: #fdf3e2; border-color: #f0d3a1; color: var(--warn); }
.notice-err { background: #fdecf1; border-color: #f2b9c9; color: var(--err); }

/* ---------- entrance ---------- */
.reveal { animation: rise 520ms cubic-bezier(0.2, 0.7, 0.2, 1) both; }
.reveal-2 { animation-delay: 80ms; }
.reveal-3 { animation-delay: 160ms; }
@keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

/* ---------- footer ---------- */
.site-footer { margin-top: auto; padding: 32px 0; border-top: 1px solid var(--hairline); color: var(--mute); font-size: 13px; }
.site-footer p { margin: 0; }

/* ---------- admin ---------- */
.admin-main { padding: 32px 0 64px; }
.admin-grid { display: grid; gap: 24px; }
@media (min-width: 900px) { .admin-grid { grid-template-columns: minmax(0, 3fr) minmax(0, 2fr); align-items: start; } }
h2 { margin: 0 0 16px; font-weight: 400; font-size: 22px; letter-spacing: -0.01em; }
.identity { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; font-size: 14px; color: var(--ink-2); }
.field { display: grid; gap: 6px; margin: 0 0 16px; }
.field label { font-size: 14px; font-weight: 600; color: var(--ink-2); }
.hint { font-size: 13px; color: var(--mute); margin: 0; }
input[type="text"], input[type="file"] {
  width: 100%; min-height: 44px; padding: 8px 12px;
  font: inherit; color: var(--ink);
  background: var(--canvas); border: 1px solid var(--input-line); border-radius: var(--radius-sm);
}
input[type="text"]:focus-visible, input[type="file"]:focus-visible { outline: 3px solid var(--focus); outline-offset: 1px; border-color: var(--blue); }
input[aria-invalid="true"] { border-color: var(--err); }
.progress { display: grid; gap: 6px; margin: 0 0 16px; }
progress { width: 100%; height: 10px; accent-color: var(--crimson); }
.qr-box { display: grid; gap: 12px; justify-items: start; }
.qr-box canvas { width: 220px; height: 220px; image-rendering: pixelated; border: 1px solid var(--hairline); border-radius: var(--radius-md); }
.qr-url { font-family: ui-monospace, Consolas, monospace; font-size: 14px; overflow-wrap: anywhere; background: var(--canvas-soft); padding: 6px 10px; border-radius: var(--radius-sm); }
dialog { border: 1px solid var(--hairline); border-radius: var(--radius-lg); padding: 24px; max-width: min(480px, calc(100vw - 32px)); color: var(--ink); box-shadow: var(--shadow-2); }
dialog::backdrop { background: rgba(16, 42, 63, 0.45); }
dialog .actions { justify-content: flex-end; margin-top: 16px; }
[hidden] { display: none !important; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .mesh::before, .mesh::after { animation: none !important; }
  .btn:hover { transform: none; }
}
.admin-header { border-bottom: 1px solid var(--hairline); }
.admin-title { font-size: clamp(28px, 5vw, 40px); max-width: none; }
.mt { margin-top: 24px; }
.mesh .brand img { mix-blend-mode: multiply; }