:root {
  --teal-dark: #0d4f3c;
  --teal: #1a6b4a;
  --teal-light: #e8f7f1;
  --gold: #c8890a;
  --gold-light: #fff8e6;
  --text: #1a1a1a;
  --muted: #5a6b62;
  --error: #b3261e;
  --bg: #fff;
  --card: #f6faf7;
  --border: #d7e6de;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.14);
  --radius: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: linear-gradient(180deg, var(--teal-light) 0, #fff 260px);
}

.wrap { max-width: 940px; margin: 0 auto; padding: 0 24px; }
.hidden { display: none !important; }

/* Top bar */
.topbar {
  border-bottom: 1px solid rgba(255,255,255,0.15);
  padding: 14px 0;
  color: #fff;
  background: linear-gradient(135deg, var(--teal-dark), var(--teal) 60%, #1d7a52);
}
.topbar .wrap { display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; color: #fff; font-weight: 700; font-size: 1.1rem; }
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 8px;
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.28);
  font-weight: 700;
}
.nav-link { color: rgba(255,255,255,0.86); text-decoration: none; margin-left: 20px; font-size: 0.95rem; }
.nav-link:hover { color: #fff; text-decoration: underline; }

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--teal-dark) 0%, var(--teal) 60%, #1d7a52 100%);
  color: #fff;
  padding: 64px 0 52px;
}
.eyebrow {
  display: inline-block; margin-bottom: 14px; padding: 5px 12px;
  border-radius: 999px; background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.26);
  font-size: 0.82rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
}
h1 { margin: 0 0 12px; font-size: clamp(1.9rem, 4.6vw, 2.9rem); line-height: 1.15; }
.hero p { margin: 0; max-width: 720px; color: rgba(255,255,255,0.92); font-size: 1.08rem; }

main { padding: 40px 0 80px; }

h2 { color: var(--teal-dark); margin: 32px 0 12px; }
h3 { color: var(--teal-dark); margin: 24px 0 10px; }

/* Panels + cards */
.panel {
  display: grid; grid-template-columns: 1fr; gap: 24px; margin-top: 32px;
}
@media (min-width: 780px) {
  .panel { grid-template-columns: minmax(280px, 380px) 1fr; }
}
.pair-card, .status-card, .upload-card, .download-card, .help {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}
.pair-card { display: flex; flex-direction: column; gap: 12px; }
.pair-card label { font-weight: 600; }
#codeInput {
  font-family: SF Mono, Menlo, Consolas, monospace;
  font-size: 1.6rem; font-weight: 700; letter-spacing: 4px;
  text-align: center; padding: 14px 10px;
  border: 2px solid var(--border); border-radius: 10px;
  background: #fff;
  text-transform: uppercase;
}
#codeInput:focus { outline: 2px solid var(--gold); border-color: var(--gold); }
.primary {
  display: inline-block;
  padding: 12px 20px; border-radius: 10px;
  border: none; cursor: pointer;
  background: var(--teal); color: #fff;
  font-weight: 700; font-size: 1rem; text-align: center;
  transition: background 120ms ease, transform 60ms ease;
  text-decoration: none;
}
.primary:hover { background: var(--teal-dark); }
.primary:disabled { background: #a4bfb2; cursor: not-allowed; }
.error { color: var(--error); font-weight: 600; }
.muted { color: var(--muted); font-size: 0.95rem; }
.detail { margin-top: 12px; }

/* Upload card */
.format-picker, .csv-options label {
  display: flex; flex-direction: column; gap: 4px;
  font-weight: 600; font-size: 0.95rem;
  margin-top: 14px;
}
.csv-options {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
  margin-top: 8px;
}
.file-drop {
  display: flex; align-items: center; justify-content: center;
  padding: 22px; margin-top: 14px;
  border: 2px dashed var(--teal); border-radius: 10px;
  background: #fff;
  cursor: pointer; text-align: center;
  font-weight: 600; color: var(--teal-dark);
}
.file-drop input { display: none; }
.file-list { margin-top: 10px; font-size: 0.95rem; color: var(--muted); }
.file-list ul { padding-left: 20px; margin: 4px 0; }
.file-list li { line-height: 1.4; }

/* Download */
.download-card .primary { margin-top: 12px; }

/* Mapping cards (Phase 3) */
.mapping-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  grid-column: 1 / -1;
}
.mapping-card h3 { margin-top: 0; }
#mappingProgress { margin: 8px 0 14px; }

.mapping-card-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 18px;
  margin: 14px 0;
}
.mapping-card-header {
  display: flex; align-items: baseline; gap: 6px;
  margin-bottom: 4px;
  color: var(--teal-dark);
}
.mapping-card-header strong { font-size: 1.05rem; word-break: break-all; }
.mapping-card-size { color: var(--muted); font-size: 0.9rem; font-weight: 400; }
.mapping-card-status { margin: 4px 0 0; }
.mapping-card-status.error { color: var(--error); font-weight: 600; }
.mapping-card-body { margin-top: 12px; }
.mapping-card-row { margin: 10px 0; }
.mapping-card-row label {
  display: flex; flex-direction: column; gap: 4px;
  font-weight: 600; font-size: 0.95rem;
}
.mapping-card-row select {
  padding: 8px 10px; font-size: 0.98rem;
  border: 1px solid var(--border); border-radius: 8px;
  background: #fff;
  min-width: 220px;
}
.mapping-card-options { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; }
.mapping-card-check {
  display: inline-flex; align-items: center; gap: 6px;
  font-weight: 600; font-size: 0.95rem;
  cursor: pointer;
}
.mapping-card-check input { margin: 0; }

.mapping-card-columns {
  margin-top: 12px;
  border-top: 1px solid var(--border);
  padding-top: 10px;
}
.mapping-column-row {
  display: grid;
  grid-template-columns: minmax(160px, 1fr) 24px minmax(220px, 1fr);
  gap: 10px; align-items: center;
  padding: 6px 0;
  border-bottom: 1px dashed var(--border);
}
.mapping-column-row:last-child { border-bottom: none; }
.mapping-column-source {
  font-family: SF Mono, Menlo, Consolas, monospace;
  font-size: 0.92rem;
  color: var(--teal-dark);
  word-break: break-all;
}
.mapping-column-arrow {
  color: var(--muted);
  text-align: center;
  font-size: 1.2rem;
}
.mapping-column-target select {
  width: 100%;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  font-size: 0.95rem;
}

.mapping-actions {
  margin-top: 16px;
  display: flex; flex-wrap: wrap; align-items: center; gap: 12px;
}
.mapping-actions .primary { min-width: 160px; }

@media (max-width: 560px) {
  .mapping-column-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }
  .mapping-column-arrow { display: none; }
}

/* Guide page */
.guide-main { padding-bottom: 48px; }
.guide-article { padding: 32px 0 64px; max-width: 820px; }
.guide-toc {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 22px;
  margin: 24px 0 32px;
  box-shadow: var(--shadow);
}
.guide-toc ol { margin: 8px 0 0 20px; }
.guide-toc a { color: var(--teal-dark); font-weight: 600; }
.guide-article section { margin: 28px 0; }
.guide-article h2 { margin-top: 0; }
.guide-article ul, .guide-article ol { padding-left: 22px; }
.guide-article li { margin: 6px 0; }
.url-callout {
  font-size: 1.2rem; font-weight: 700;
  padding: 14px 16px; border-radius: 10px;
  background: var(--teal-light); border: 1px solid var(--border);
  word-break: break-all;
}
.url-callout a { color: var(--teal-dark); }
.note {
  margin-top: 12px; padding: 12px 14px;
  background: var(--gold-light); border-left: 4px solid var(--gold);
  border-radius: 0 8px 8px 0;
}
.hero-cta-row { margin-top: 18px; }
.hero .primary {
  background: var(--gold); color: #1a1a1a;
}
.hero .primary:hover { background: #a87008; color: #1a1a1a; }
.hero code, .help code, .guide-article code {
  display: inline-block; padding: 1px 7px; border-radius: 5px;
  background: #fff; color: var(--teal-dark); font-weight: 700;
}
.hero code {
  background: rgba(255,255,255,.95); color: var(--teal-dark);
}
.help a, .guide-article a { color: var(--teal); font-weight: 600; }

/* Format list */
.format-list { columns: 2 260px; column-gap: 32px; list-style: none; padding: 0; }
.format-list li { break-inside: avoid; padding: 8px 12px; margin: 4px 0; background: #fff; border: 1px solid var(--border); border-radius: 8px; font-size: 0.95rem; }

/* Footer */
footer { padding: 32px 0; color: var(--muted); font-size: 0.92rem; text-align: center; }
footer a { color: var(--teal); }