:root {
  --bg: #f4f4f2;
  --card: #ffffff;
  --text: #171717;
  --muted: #6d6d6d;
  --line: #deded9;
  --accent: #1f2937;
  --accent-hover: #111827;
  --soft: #f8f8f6;
  --danger: #8a1f1f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top left, #ffffff 0, var(--bg) 38%, #ecece8 100%);
  min-height: 100vh;
}

.shell {
  width: min(980px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0;
}

.hero {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 24px;
  align-items: end;
  margin-bottom: 24px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(34px, 5vw, 58px);
  line-height: .95;
  letter-spacing: -0.055em;
}

.lead {
  margin: 18px 0 0;
  max-width: 620px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.55;
}

.status-card,
.card,
.result,
.hint {
  background: rgba(255, 255, 255, .84);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, .06);
  backdrop-filter: blur(12px);
}

.status-card {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 18px;
}

.status-card strong {
  display: block;
  font-size: 14px;
}

.status-card p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.dot {
  width: 10px;
  height: 10px;
  margin-top: 4px;
  border-radius: 50%;
  background: #16a34a;
  box-shadow: 0 0 0 5px rgba(22, 163, 74, .12);
  flex: 0 0 auto;
}

.card {
  padding: 24px;
}

.dropzone {
  min-height: 180px;
  border: 1.5px dashed #b8b8b1;
  border-radius: 18px;
  background: var(--soft);
  display: grid;
  place-items: center;
  text-align: center;
  padding: 28px;
  cursor: pointer;
  transition: .18s ease;
}

.dropzone:hover,
.dropzone.dragover {
  border-color: var(--accent);
  background: #ffffff;
}

.dropzone input {
  display: none;
}

.drop-title {
  display: block;
  font-size: 18px;
  font-weight: 650;
}

.drop-subtitle {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 24px 0 14px;
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .08em;
}

.section-title::after {
  content: '';
  height: 1px;
  background: var(--line);
  flex: 1;
}

.choice-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.choice {
  position: relative;
  display: block;
  min-height: 138px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  padding: 16px;
  cursor: pointer;
  transition: .18s ease;
}

.choice input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.choice strong {
  display: block;
  margin-bottom: 8px;
  font-size: 15px;
}

.choice small {
  display: block;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
}

.choice:has(input:checked) {
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
  background: #fbfbf9;
}

.inline-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.inline-grid label > span {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 13px;
}

select {
  width: 100%;
  height: 48px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  color: var(--text);
  padding: 0 14px;
  font-size: 15px;
  outline: none;
}

select:focus {
  border-color: var(--accent);
}

.toggles {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.switch-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  color: var(--muted);
  font-size: 14px;
}

.switch-row input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

button,
.result a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 52px;
  padding: 0 22px;
  border: 0;
  border-radius: 16px;
  background: var(--accent);
  color: #fff;
  font-size: 15px;
  font-weight: 650;
  text-decoration: none;
  cursor: pointer;
  transition: .18s ease;
}

button {
  width: 100%;
  margin-top: 22px;
}

button:hover,
.result a:hover {
  background: var(--accent-hover);
}

button:disabled {
  cursor: wait;
  opacity: .72;
}

.result {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: 18px;
  padding: 18px;
}

.result p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.result.error {
  border-color: rgba(138, 31, 31, .35);
}

.result.error strong {
  color: var(--danger);
}

.hidden {
  display: none;
}

.hint {
  margin-top: 18px;
  padding: 16px 18px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.hint strong {
  color: var(--text);
}

@media (max-width: 860px) {
  .hero,
  .choice-grid,
  .inline-grid {
    grid-template-columns: 1fr;
  }

  .choice {
    min-height: auto;
  }

  .result {
    align-items: stretch;
    flex-direction: column;
  }
}