/* Ferndrop: calm paper-and-fern look. System fonts only (no third-party font requests). */
:root {
  /* Cyanotype: Prussian-blue prints on cool paper. */
  --bg: #edf2ee;
  --bg-2: #dfe8e3;
  --surface: #f7faf8;
  --ink: #0a2540;
  --muted: #4a647c;
  --line: #c3d2cd;
  --fern: #0f3a6b;
  --fern-ink: #ffffff;
  --fern-soft: #dbe7ef;
  --clay: #8a6d12;
  --danger: #9b2c2c;
  --blue: #0f3a6b;
  --blue-deep: #0a2a50;
  --print: #eaf3f8;
  --shadow: 0 1px 2px rgba(10, 37, 64, 0.08), 0 14px 34px -14px rgba(10, 37, 64, 0.28);
  --radius: 16px;
  --sans: "Avenir Next", "Segoe UI Variable Display", "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
  --display: var(--sans);
  --serif: var(--sans);
}

:root:not([data-theme="light"]) {
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0a2038;
    --bg-2: #0e2c4b;
    --surface: #0f2b49;
    --ink: #e6eff6;
    --muted: #93aec6;
    --line: #1f4366;
    --fern: #9cc4e4;
    --fern-ink: #08203d;
    --fern-soft: #12304f;
    --clay: #e4d96f;
    --danger: #f19a9a;
    --blue: #0f3a6b;
    --blue-deep: #0a2a50;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 14px 34px -14px rgba(0, 0, 0, 0.65);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(900px 480px at 85% -10%, var(--fern-soft), transparent 70%),
    var(--bg);
  color: var(--ink);
  font: 16px/1.55 var(--sans);
}

a { color: var(--fern); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--clay); outline-offset: 2px; border-radius: 6px; }

.skip { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; border-radius: 8px; }
.skip:focus { left: 8px; z-index: 10; }

/* header / footer */
.top, .foot { width: 100%; max-width: 920px; margin: 0 auto; padding: 20px 20px; display: flex; gap: 16px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-family: var(--sans); font-size: 1.3rem; font-weight: 600; letter-spacing: -0.02em; }
.brand svg { width: 30px; height: 30px; color: var(--fern); }
.top nav { display: flex; gap: 20px; font-size: 0.95rem; }
.top nav a { color: var(--muted); text-decoration: none; }
.top nav a:hover { color: var(--ink); text-decoration: underline; }
.foot { margin-top: auto; padding-top: 36px; padding-bottom: 28px; color: var(--muted); font-size: 0.875rem; border-top: 1px solid transparent; }
.foot a { color: var(--muted); }
.foot nav { display: flex; gap: 18px; flex-wrap: wrap; }

main { width: 100%; max-width: 920px; margin: 0 auto; padding: 0 20px 24px; }
.narrow { max-width: 640px; }

h1, h2 { font-family: var(--display); font-weight: 500; line-height: 1.12; letter-spacing: -0.02em; }
h1 { font-size: clamp(1.9rem, 4.6vw, 2.7rem); margin: 8px 0 12px; }
h2 { font-size: 1.4rem; margin: 40px 0 10px; }
h3 { font-family: var(--sans); font-weight: 700; font-size: 1.05rem; margin: 24px 0 6px; }
.lede { color: var(--muted); font-size: 1.1rem; max-width: 40ch; margin: 0 0 28px; }
.muted { color: var(--muted); }
.small { font-size: 0.875rem; }

/* card */
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; }
.stack > * + * { margin-top: 16px; }

/* drop zone */
.drop {
  display: grid; place-items: center; gap: 6px; text-align: center;
  padding: 44px 20px; border: 2px dashed var(--line); border-radius: 14px;
  background: transparent; cursor: pointer; transition: border-color .15s, background .15s;
  color: var(--ink); width: 100%; font: inherit;
}
.drop:hover, .drop.over { border-color: var(--fern); background: var(--fern-soft); }
.drop svg { width: 40px; height: 40px; color: var(--fern); }
.drop strong { font-size: 1.15rem; font-weight: 600; }
.drop span { color: var(--muted); font-size: 0.95rem; }

.file-chip { display: flex; align-items: center; gap: 12px; padding: 12px 14px; border: 1px solid var(--line); border-radius: 12px; background: var(--bg); }
.file-chip .name { font-weight: 600; overflow-wrap: anywhere; }
.file-chip .meta { color: var(--muted); font-size: 0.9rem; }
.file-chip button { margin-left: auto; }

/* mode choices */
.modes { display: grid; gap: 12px; grid-template-columns: 1fr 1fr; }
@media (max-width: 600px) { .modes { grid-template-columns: 1fr; } }
.mode {
  text-align: left; padding: 16px; border: 1px solid var(--line); border-radius: 14px;
  background: var(--surface); color: var(--ink); font: inherit; cursor: pointer;
  transition: border-color .15s, transform .15s, box-shadow .15s; display: block; width: 100%;
}
.mode:hover:not(:disabled) { border-color: var(--fern); transform: translateY(-1px); box-shadow: var(--shadow); }
.mode:disabled { opacity: .55; cursor: not-allowed; }
.mode b { display: block; font-size: 1.05rem; margin-bottom: 4px; }
.mode span { color: var(--muted); font-size: 0.92rem; }

/* buttons */
.btn {
  appearance: none; border: 0; border-radius: 999px; padding: 12px 22px; font: inherit; font-weight: 600;
  background: var(--fern); color: var(--fern-ink); cursor: pointer; transition: transform .1s, opacity .15s;
  text-decoration: none; display: inline-block;
}
.btn:hover:not(:disabled) { transform: translateY(-1px); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btn.small { padding: 6px 14px; font-size: 0.9rem; font-weight: 500; }
.btn.big { padding: 15px 34px; font-size: 1.05rem; }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }

/* progress */
.progress { display: grid; gap: 8px; }
.bar { height: 12px; border-radius: 999px; background: var(--bg-2); overflow: hidden; border: 1px solid var(--line); }
.bar > i { display: block; height: 100%; width: calc(var(--p, 0) * 1%); background: linear-gradient(90deg, var(--fern), color-mix(in srgb, var(--fern) 70%, var(--clay))); border-radius: 999px; transition: width .2s linear; }
.progress .line { display: flex; justify-content: space-between; gap: 12px; color: var(--muted); font-size: 0.92rem; font-variant-numeric: tabular-nums; }
.progress .what { color: var(--ink); font-weight: 600; }

/* link box */
.linkbox { display: flex; gap: 8px; }
.linkbox input { flex: 1; min-width: 0; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--line); background: var(--bg); color: var(--ink); font: inherit; }

/* forms */
label { display: block; font-weight: 600; margin-bottom: 4px; }
input[type=text], input[type=email], input[type=url], select, textarea {
  width: 100%; padding: 11px 13px; border-radius: 12px; border: 1px solid var(--line); background: var(--bg); color: var(--ink); font: inherit;
}
textarea { min-height: 120px; resize: vertical; }

/* notices */
.note { padding: 12px 14px; border-radius: 12px; background: var(--fern-soft); color: var(--ink); font-size: 0.95rem; }
.note.warn { background: color-mix(in srgb, var(--clay) 16%, var(--surface)); }
.note.err { background: color-mix(in srgb, var(--danger) 14%, var(--surface)); color: var(--ink); }

/* sponsor */
.sponsor { margin-top: 24px; padding: 16px 18px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }
.sponsor .tag { text-transform: uppercase; letter-spacing: .12em; font-size: 0.7rem; color: var(--muted); font-weight: 700; margin-bottom: 6px; }
.sponsor a.s-body { display: flex; gap: 14px; align-items: center; color: var(--ink); text-decoration: none; }
.sponsor img { width: 56px; height: 56px; border-radius: 10px; object-fit: cover; }
.sponsor .s-name { font-weight: 700; }
.sponsor.empty { background: transparent; border-style: dashed; color: var(--muted); font-size: 0.92rem; }

/* how it works */
.steps { display: grid; gap: 16px; grid-template-columns: repeat(3, 1fr); margin: 14px 0 0; padding: 0; list-style: none; }
@media (max-width: 720px) { .steps { grid-template-columns: 1fr; } }
.steps li { padding: 16px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }
.steps b { font-size: 1.05rem; display: block; margin-bottom: 4px; }
.steps span { color: var(--muted); font-size: 0.95rem; }

.prose { max-width: 68ch; }
.prose h2 { font-size: 1.25rem; margin-top: 32px; }
.prose table { border-collapse: collapse; width: 100%; font-size: 0.95rem; margin: 12px 0; }
.prose th, .prose td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
.prose th { background: var(--bg-2); }

.hidden { display: none !important; }
.center { text-align: center; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.leaf-bg { position: fixed; right: -60px; bottom: -40px; width: 340px; height: 340px; color: var(--fern); opacity: .06; pointer-events: none; z-index: -1; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

.m0 { margin: 0; }
.mt4 { margin: 4px 0 0; }
.fname { margin: 4px 0; overflow-wrap: anywhere; }

/* ---------- ads (only present when ads are switched on) ---------- */
.consent { position: fixed; left: 16px; right: 16px; bottom: 16px; z-index: 50; max-width: 560px; margin-inline: auto; padding: 18px 20px; border-radius: var(--radius); background: var(--surface); color: var(--ink); border: 1px solid var(--line); box-shadow: 0 20px 50px -20px rgba(3, 14, 32, 0.6); }
.consent h2 { margin: 0 0 6px; font-size: 1.1rem; letter-spacing: -0.02em; }
.consent p { margin: 0 0 14px; font-size: 0.95rem; color: var(--muted); }
.consent .row { gap: 10px; }
.consent .btn { flex: 1 1 140px; text-align: center; }
.ad-slot { margin: clamp(32px, 6vw, 64px) auto; max-width: 1180px; padding-inline: var(--gutter, 24px); }
.ad-slot .ad-label { display: block; margin-bottom: 6px; font-size: 0.75rem; color: var(--muted); }
.linklike { appearance: none; background: none; border: 0; padding: 0; font: inherit; color: inherit; text-decoration: underline; text-underline-offset: 3px; cursor: pointer; }