:root {
  --bg: oklch(98% 0.012 80);
  --bg-2: oklch(96% 0.018 75);
  --ink: oklch(22% 0.012 60);
  --ink-2: oklch(45% 0.012 60);
  --ink-3: oklch(65% 0.012 60);
  --rule: oklch(88% 0.014 70);
  --accent: oklch(64% 0.16 38);
  --accent-soft: oklch(94% 0.04 38);
  --good: oklch(58% 0.13 145);
  --serif: "Instrument Serif", "Iowan Old Style", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}

::selection { background: var(--accent); color: var(--bg); }

/* ---------- top strip ---------- */
.strip {
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
}
.strip-inner {
  max-width: 640px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-2);
  letter-spacing: 0.02em;
}
.strip-inner .dot {
  display: inline-block;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 8px;
  vertical-align: 1px;
}
.strip-inner .right { text-transform: uppercase; }

/* ---------- shell ---------- */
main {
  max-width: 640px;
  margin: 0 auto;
  padding: 64px 24px 96px;
}

/* ---------- hero ---------- */
.hero { margin-bottom: 64px; }
.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
}
h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 56px;
  line-height: 1.02;
  letter-spacing: -0.015em;
  margin: 0 0 20px;
  color: var(--ink);
}
h1 em { font-style: italic; color: var(--accent); }
.lede {
  font-size: 17px;
  color: var(--ink-2);
  max-width: 52ch;
  text-wrap: pretty;
}
.lede a.fineprint {
  color: var(--ink-3);
  text-decoration: underline;
  text-decoration-color: var(--rule);
  text-underline-offset: 3px;
}

/* ---------- form sections ---------- */
form { display: contents; }

section.field {
  border-top: 1px solid var(--rule);
  padding: 36px 0 8px;
  display: grid;
  grid-template-columns: 24px 1fr;
  column-gap: 20px;
}
section.field .num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-3);
  padding-top: 6px;
  letter-spacing: 0.04em;
}
section.field .body { min-width: 0; }

.label {
  font-family: var(--serif);
  font-size: 26px;
  line-height: 1.15;
  margin: 0 0 6px;
  color: var(--ink);
  letter-spacing: -0.005em;
}
.hint {
  font-size: 14px;
  color: var(--ink-2);
  margin: 0 0 22px;
  text-wrap: pretty;
}
.hint .aside { color: var(--ink-3); font-style: italic; }

/* ---------- A: upload ---------- */
.drop {
  display: block;
  position: relative;
  border: 1.5px dashed var(--rule);
  border-radius: 14px;
  padding: 28px;
  text-align: left;
  background: var(--bg-2);
  transition: border-color 160ms ease, background 160ms ease, transform 160ms ease;
  cursor: pointer;
}
.drop:hover { border-color: var(--ink-3); }
.drop.dragover {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: scale(1.005);
}
.drop.has-file {
  border-style: solid;
  border-color: var(--ink);
  background: var(--bg);
}
.drop input[type="file"] {
  position: absolute; inset: 0;
  opacity: 0;
  cursor: pointer;
}
.drop-row { display: flex; align-items: center; gap: 16px; }
.drop-icon {
  flex: 0 0 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--bg);
  border: 1px solid var(--rule);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-2);
  letter-spacing: 0.04em;
}
.drop.has-file .drop-icon {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}
.drop-text { min-width: 0; flex: 1; }
.drop-title { font-size: 15px; color: var(--ink); font-weight: 500; }
.drop-sub {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  margin-top: 4px;
  letter-spacing: 0.02em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.drop .clear {
  background: none;
  border: 0;
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 11px;
  cursor: pointer;
  padding: 6px 8px;
  border-radius: 6px;
  position: relative;
  z-index: 2;
}
.drop .clear:hover { color: var(--ink); background: var(--bg-2); }

/* ---------- B: row of two controls ---------- */
.duo { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.duo .sub {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--ink-3);
  text-transform: uppercase;
  margin-bottom: 10px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}
.duo .sub .read {
  font-family: var(--mono);
  color: var(--ink);
  font-size: 12px;
  text-transform: none;
  letter-spacing: 0;
}

/* select */
.select-wrap { position: relative; }
select {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 12px 14px;
  font-family: var(--sans);
  font-size: 15px;
  color: var(--ink);
  cursor: pointer;
  transition: border-color 120ms ease;
}
select:hover { border-color: var(--ink-3); }
select:focus { outline: none; border-color: var(--ink); }
.select-wrap::after {
  content: "";
  position: absolute;
  right: 14px;
  top: 50%;
  width: 8px; height: 8px;
  border-right: 1.5px solid var(--ink-2);
  border-bottom: 1.5px solid var(--ink-2);
  transform: translateY(-70%) rotate(45deg);
  pointer-events: none;
}

/* range */
.range-wrap { padding-top: 4px; }
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--rule);
  border-radius: 999px;
  outline: none;
  margin: 14px 0 6px;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--ink);
  cursor: grab;
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 1px var(--ink);
  transition: transform 120ms ease;
}
input[type="range"]::-webkit-slider-thumb:active { cursor: grabbing; transform: scale(1.1); }
input[type="range"]::-moz-range-thumb {
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--ink);
  cursor: grab;
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 1px var(--ink);
}
.ticks {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-3);
  letter-spacing: 0.04em;
}

/* ---------- C: textarea ---------- */
textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 12px;
  padding: 16px 18px;
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink);
  resize: vertical;
  min-height: 168px;
  transition: border-color 120ms ease;
}
textarea:hover { border-color: var(--ink-3); }
textarea:focus { outline: none; border-color: var(--ink); }
textarea::placeholder { color: var(--ink-3); }

.preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}
.chip {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--rule);
  background: var(--bg);
  color: var(--ink-2);
  cursor: pointer;
  transition: all 120ms ease;
}
.chip:hover { border-color: var(--ink); color: var(--ink); }
.chip:active { transform: scale(0.97); }

/* ---------- D: email ---------- */
input[type="email"] {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 12px 14px;
  font-family: var(--sans);
  font-size: 15px;
  color: var(--ink);
  transition: border-color 120ms ease;
}
input[type="email"]:hover { border-color: var(--ink-3); }
input[type="email"]:focus { outline: none; border-color: var(--ink); }
input[type="email"]::placeholder { color: var(--ink-3); }

/* ---------- submit ---------- */
.submit-row {
  border-top: 1px solid var(--rule);
  margin-top: 36px;
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.submit-meta {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
}
button.go {
  background: var(--ink);
  color: var(--bg);
  border: 0;
  border-radius: 999px;
  padding: 14px 26px;
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease, opacity 120ms ease;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
button.go:hover { transform: translateY(-1px); background: oklch(28% 0.012 60); }
button.go:active { transform: translateY(0); }
button.go:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }
button.go .arrow {
  font-family: var(--serif);
  font-style: italic;
  font-size: 18px;
  line-height: 1;
  transition: transform 200ms ease;
}
button.go:hover .arrow { transform: translateX(3px); }

/* ---------- progress view ---------- */
.progress-card {
  border: 1px solid var(--rule);
  border-radius: 16px;
  padding: 32px;
  background: var(--bg-2);
}
.progress-card h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 32px;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
.progress-card .id {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  margin-bottom: 24px;
  letter-spacing: 0.04em;
}
.bar {
  height: 6px;
  background: var(--rule);
  border-radius: 999px;
  overflow: hidden;
  margin: 18px 0 10px;
}
.bar > span {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 999px;
  transition: width 600ms cubic-bezier(0.2, 0.8, 0.2, 1);
}
.bar-meta {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-2);
  letter-spacing: 0.02em;
}
.stage-line {
  margin-top: 22px;
  font-size: 15px;
  color: var(--ink);
  text-wrap: pretty;
  min-height: 1.6em;
}
.stage-line .stage-aside { color: var(--ink-3); font-style: italic; }

.stage-list {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  border-top: 1px solid var(--rule);
}
.stage-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
}
.stage-list li .marker {
  flex: 0 0 14px; height: 14px;
  border-radius: 50%;
  border: 1.5px solid var(--rule);
  background: transparent;
  transition: all 200ms ease;
}
.stage-list li.active { color: var(--ink); }
.stage-list li.active .marker {
  border-color: var(--accent);
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}
.stage-list li.done { color: var(--ink-2); }
.stage-list li.done .marker { border-color: var(--ink); background: var(--ink); }
.stage-list li.done .marker::after {
  content: "✓";
  color: var(--bg);
  font-size: 9px;
  display: block;
  text-align: center;
  line-height: 11px;
}

/* ---------- done view ---------- */
.done-card {
  border: 1px solid var(--ink);
  border-radius: 16px;
  padding: 32px;
  background: var(--bg);
}
.done-card h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 36px;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}
.done-card .sub { color: var(--ink-2); margin-bottom: 24px; }
.ep-list { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--rule); }
.ep {
  display: grid;
  grid-template-columns: 36px 1fr auto;
  gap: 16px;
  align-items: center;
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
}
.ep .ep-num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.04em;
}
.ep .ep-title { font-size: 15px; color: var(--ink); }
.ep .ep-meta {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
  margin-top: 2px;
}
.ep .dl {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink);
  text-decoration: none;
  padding: 8px 12px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  transition: all 120ms ease;
  letter-spacing: 0.04em;
}
.ep .dl:hover { background: var(--ink); color: var(--bg); border-color: var(--ink); }

.restart {
  margin-top: 24px;
  background: none;
  border: 0;
  color: var(--ink-2);
  text-decoration: underline;
  text-decoration-color: var(--rule);
  text-underline-offset: 3px;
  font-size: 14px;
  cursor: pointer;
  padding: 4px 0;
}
.restart:hover { color: var(--ink); text-decoration-color: var(--ink); }

/* ---------- view switching ---------- */
.view { display: none; }
.view.active { display: block; animation: fade 320ms ease both; }
@keyframes fade {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* shake on error */
@keyframes shake {
  0%,100% { transform: translateX(0); }
  20% { transform: translateX(-4px); }
  40% { transform: translateX(4px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(2px); }
}
.shake { animation: shake 360ms ease; }

/* tiny spinner */
.spinner {
  width: 12px; height: 12px;
  border: 1.5px solid var(--bg);
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 700ms linear infinite;
  display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* footer */
footer {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 24px 48px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
  display: flex;
  justify-content: space-between;
}

@media (max-width: 520px) {
  h1 { font-size: 44px; }
  main { padding: 40px 20px 64px; }
  section.field { grid-template-columns: 1fr; column-gap: 0; }
  section.field .num { padding-top: 0; margin-bottom: 6px; }
  .duo { grid-template-columns: 1fr; }
  .strip-inner .right { display: none; }
  footer { flex-direction: column; gap: 4px; align-items: flex-start; }
  .drop { padding: 22px; }
  .drop-row { gap: 12px; }
  .progress-card, .done-card { padding: 24px; }
  .progress-card h2 { font-size: 28px; }
  .done-card h2 { font-size: 30px; }
  .submit-row { flex-direction: column-reverse; align-items: stretch; gap: 14px; }
  button.go { justify-content: center; padding: 14px 20px; }
  .submit-meta { text-align: center; }
  .ep { grid-template-columns: 1fr auto; gap: 12px; }
  .ep .ep-num { display: none; }
}

@media (max-width: 380px) {
  h1 { font-size: 36px; }
  .label { font-size: 22px; }
  main { padding: 32px 16px 56px; }
  .strip-inner { padding: 12px 16px; }
  footer { padding: 0 16px 36px; }
  .chip { padding: 7px 11px; }
  .drop-icon { flex: 0 0 36px; height: 36px; }
}

/* Better tap response on touch devices */
@media (hover: none) {
  button.go:hover { transform: none; background: var(--ink); }
  button.go:hover .arrow { transform: none; }
  .chip:hover { border-color: var(--rule); color: var(--ink-2); }
  .ep .dl:hover { background: transparent; color: var(--ink); border-color: var(--rule); }
}