:root {
  --navy: #002060;
  --navy-soft: #1a3a78;
  --navy-tint: #eef2fb;
  --navy-tint-strong: #dde6f7;
  --accent: #d4a017;
  --ink: #1a1a1f;
  --ink-soft: #51545e;
  --ink-muted: #7e828c;
  --line: #e4e6ee;
  --line-soft: #eef0f5;
  --bg: #f7f8fb;
  --card: #ffffff;
  --ok: #1f7a3d;
  --ok-bg: #e8f5ec;
  --warn: #a66b00;
  --warn-bg: #fff6e0;
  --err: #a4262c;
  --err-bg: #fdecee;
  --shadow-sm: 0 1px 2px rgba(20, 28, 60, 0.04), 0 1px 1px rgba(20, 28, 60, 0.02);
  --shadow-md: 0 4px 14px rgba(20, 28, 60, 0.06), 0 1px 3px rgba(20, 28, 60, 0.04);
  --shadow-lg: 0 18px 40px rgba(20, 28, 60, 0.10), 0 4px 10px rgba(20, 28, 60, 0.05);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "SF Pro Text", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(0, 32, 96, 0.06), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(212, 160, 23, 0.07), transparent 60%),
    var(--bg);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 56px 24px 80px;
}

/* ─────────── header ─────────── */
header { margin-bottom: 36px; }

.eyebrow {
  margin: 0 0 8px 0;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--navy);
  opacity: 0.7;
}

header h1 {
  margin: 0 0 10px 0;
  font-size: 32px;
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
}

header .sub {
  margin: 0;
  color: var(--ink-soft);
  font-size: 16px;
  max-width: 56ch;
}

/* ─────────── steps ─────────── */
.steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
  counter-reset: step;
}

.steps > li {
  position: relative;
  padding-left: 56px;
}

.step-num {
  position: absolute;
  left: 0;
  top: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--card);
  border: 1.5px solid var(--line);
  color: var(--ink-muted);
  font-weight: 700;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.steps > li::before {
  content: "";
  position: absolute;
  left: 17.5px;
  top: 36px;
  bottom: -18px;
  width: 1.5px;
  background: linear-gradient(to bottom, var(--line) 0%, transparent 100%);
}

.steps > li:last-child::before { display: none; }

/* Active state on step 1 when there's no file yet; switches via JS on step 2 */
.steps > li:not(.step-pending) .step-num,
.steps > li.is-active .step-num {
  background: var(--navy);
  color: #fff;
  border-color: var(--navy);
}

/* ─────────── drop zone ─────────── */
.drop-zone {
  position: relative;
  background: var(--card);
  border: 2px dashed var(--line);
  border-radius: var(--radius-lg);
  padding: 36px 24px 30px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: border-color 0.18s, background 0.18s, transform 0.18s, box-shadow 0.18s;
}

.drop-zone:hover {
  border-color: var(--navy-soft);
  background: #fcfdff;
}

.drop-zone.drag-over {
  border-color: var(--navy);
  background: var(--navy-tint);
  transform: scale(1.01);
  box-shadow: var(--shadow-md);
}

.drop-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 12px;
  border-radius: 50%;
  background: var(--navy-tint);
  color: var(--navy);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.18s, transform 0.18s;
}

.drop-zone.drag-over .drop-icon {
  background: var(--navy-tint-strong);
  transform: translateY(-2px);
}

.drop-headline {
  margin: 0;
  font-size: 17px;
  color: var(--ink);
}

.drop-headline code {
  background: var(--line-soft);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.92em;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
}

.drop-or {
  margin: 4px 0 14px 0;
  color: var(--ink-soft);
  font-size: 14px;
}

.hint {
  margin: 0;
  color: var(--ink-muted);
  font-size: 12.5px;
}

/* ─────────── buttons ─────────── */
button {
  font: inherit;
  font-weight: 600;
  background: var(--navy);
  color: #fff;
  border: none;
  padding: 11px 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s, transform 0.08s, box-shadow 0.15s;
  box-shadow: var(--shadow-sm);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

button:hover:not(:disabled) {
  background: var(--navy-soft);
  box-shadow: var(--shadow-md);
}

button:active:not(:disabled) { transform: translateY(1px); }

button:focus-visible {
  outline: 2px solid var(--navy);
  outline-offset: 2px;
}

button:disabled {
  background: #cdd1dc;
  color: #fff;
  cursor: not-allowed;
  box-shadow: none;
}

button .muted {
  font-weight: 400;
  opacity: 0.78;
  font-size: 13px;
}

button.link {
  background: transparent;
  color: var(--navy);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  padding: 0;
  box-shadow: none;
}

button.link:hover:not(:disabled) {
  background: transparent;
  color: var(--navy-soft);
  box-shadow: none;
}

/* ─────────── result card ─────────── */
.result {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 22px 22px 20px;
  box-shadow: var(--shadow-sm);
  animation: cardIn 0.25s ease;
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.result-placeholder {
  background: transparent;
  border: 1.5px dashed var(--line);
  border-radius: var(--radius-lg);
  padding: 18px 22px;
  color: var(--ink-muted);
  font-size: 14px;
}

.result-placeholder p { margin: 0; }

.result:not(.hidden) + .result-placeholder { display: none; }

.parse-summary {
  margin: 0 0 16px 0;
  padding: 10px 12px;
  background: var(--ok-bg);
  color: var(--ok);
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  font-weight: 500;
}

.parse-summary:empty { display: none; }

.buttons {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.status {
  margin: 14px 0 0 0;
  font-size: 13.5px;
  min-height: 1.2em;
  color: var(--ink-soft);
}

.status.ok { color: var(--ok); font-weight: 500; }
.status.warn { color: var(--warn); font-weight: 500; }

/* ─────────── paste hint card ─────────── */
.paste-hint {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 16px 22px;
  box-shadow: var(--shadow-sm);
  color: var(--ink-soft);
  font-size: 14px;
}

.paste-hint p { margin: 0; }
.paste-hint strong { color: var(--ink); }

kbd {
  display: inline-block;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  font-size: 11.5px;
  padding: 2px 6px;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: #fafbff;
  color: var(--ink);
  line-height: 1;
}

/* ─────────── fallback / error ─────────── */
.fallback {
  margin-top: 24px;
  padding: 16px;
  background: var(--warn-bg);
  border: 1px solid #f0d99c;
  border-radius: var(--radius-md);
  font-size: 14px;
}

.fallback p { margin: 0 0 8px 0; }

.fallback textarea {
  width: 100%;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  font-size: 12px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: #fffdf6;
  resize: vertical;
}

.error {
  margin-top: 24px;
  background: var(--err-bg);
  border: 1px solid #f1c4c8;
  color: var(--err);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  white-space: pre-wrap;
  font-size: 14px;
}

/* ─────────── footer ─────────── */
footer {
  margin-top: 56px;
  text-align: center;
  color: var(--ink-muted);
  font-size: 12.5px;
}

footer p { margin: 0; }

/* ─────────── utility ─────────── */
.hidden { display: none !important; }

code {
  background: var(--line-soft);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 0.92em;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
}

/* ─────────── responsive ─────────── */
@media (max-width: 520px) {
  main { padding: 32px 16px 56px; }
  header h1 { font-size: 26px; }
  .steps > li { padding-left: 0; }
  .steps > li::before { display: none; }
  .step-num { position: relative; margin-bottom: 12px; }
  .buttons { flex-direction: column; align-items: stretch; }
  .buttons button { justify-content: center; }
}

/* ─────────── dark mode ─────────── */
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e7e9f0;
    --ink-soft: #b4b8c4;
    --ink-muted: #888d99;
    --line: #2c2f3a;
    --line-soft: #23262f;
    --bg: #14151a;
    --card: #1c1e26;
    --navy: #6b8fe0;
    --navy-soft: #95b1eb;
    --navy-tint: #1f2a44;
    --navy-tint-strong: #2a3a5d;
    --ok-bg: #14361f;
    --warn-bg: #3a2c0c;
    --err-bg: #3a1416;
  }

  body {
    background:
      radial-gradient(1200px 600px at 80% -10%, rgba(107, 143, 224, 0.10), transparent 60%),
      radial-gradient(900px 500px at -10% 110%, rgba(212, 160, 23, 0.06), transparent 60%),
      var(--bg);
  }

  button:disabled { background: #2c2f3a; color: var(--ink-muted); }
  kbd { background: #23262f; }
  .fallback { border-color: #5a4810; }
  .fallback textarea { background: #1c1a14; color: var(--ink); }
  .error { border-color: #6e2128; }
}