.hdc-calculator {
  --hdc-bg: #f4f6f8;
  --hdc-card: #ffffff;
  --hdc-card-2: #f8fafc;
  --hdc-text: #111827;
  --hdc-muted: #5b6472;
  --hdc-border: #d8dee8;
  --hdc-primary: #3f4652;
  --hdc-primary-2: #242a33;
  --hdc-accent: #d7dee8;
  --hdc-focus: #2563eb;
  --hdc-danger: #b42318;
  --hdc-success: #067647;
  --hdc-shadow: 0 20px 55px rgba(15, 23, 42, 0.12);
  --hdc-radius: 22px;
  background: var(--hdc-bg);
  color: var(--hdc-text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
  margin: 0 auto;
  max-width: 1280px;
  width: 100%;
}

.hdc-calculator[data-theme="dark"] {
  --hdc-bg: #111318;
  --hdc-card: #1a1f29;
  --hdc-card-2: #222936;
  --hdc-text: #f5f7fb;
  --hdc-muted: #bbc3d1;
  --hdc-border: #374151;
  --hdc-primary: #e4e8ef;
  --hdc-primary-2: #cbd5e1;
  --hdc-accent: #2f3745;
  --hdc-focus: #93c5fd;
  --hdc-danger: #fda29b;
  --hdc-success: #75e0a7;
  --hdc-shadow: 0 22px 58px rgba(0, 0, 0, 0.35);
}

.hdc-calculator,
.hdc-calculator * {
  box-sizing: border-box;
}

.hdc-shell {
  padding: clamp(16px, 3vw, 34px);
}

.hdc-header {
  align-items: flex-start;
  background: linear-gradient(135deg, var(--hdc-card), var(--hdc-card-2));
  border: 1px solid var(--hdc-border);
  border-radius: var(--hdc-radius);
  box-shadow: var(--hdc-shadow);
  display: flex;
  gap: 16px;
  justify-content: space-between;
  margin-bottom: 18px;
  padding: clamp(18px, 3vw, 28px);
}

.hdc-eyebrow {
  color: var(--hdc-muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  margin: 0 0 6px;
  text-transform: uppercase;
}

.hdc-header h2 {
  color: var(--hdc-text);
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin: 0;
}

.hdc-theme-toggle,
.hdc-btn {
  -webkit-tap-highlight-color: transparent;
  align-items: center;
  appearance: none;
  border: 1px solid var(--hdc-border);
  border-radius: 999px;
  cursor: pointer;
  display: inline-flex;
  font: inherit;
  font-weight: 800;
  gap: 8px;
  justify-content: center;
  min-height: 44px;
  padding: 10px 15px;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease, border-color 180ms ease;
}

.hdc-theme-toggle {
  background: var(--hdc-primary);
  color: var(--hdc-card);
  flex: 0 0 auto;
}

.hdc-btn {
  background: var(--hdc-card-2);
  color: var(--hdc-text);
}

.hdc-btn-primary {
  background: var(--hdc-primary);
  border-color: var(--hdc-primary);
  color: var(--hdc-card);
}

.hdc-btn-ghost {
  background: transparent;
}

.hdc-theme-toggle:hover,
.hdc-btn:hover {
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.15);
  transform: translateY(-1px);
}

.hdc-theme-toggle:focus-visible,
.hdc-btn:focus-visible,
.hdc-calculator input:focus-visible,
.hdc-calculator select:focus-visible,
.hdc-calculator textarea:focus-visible {
  outline: 3px solid var(--hdc-focus);
  outline-offset: 3px;
}

.hdc-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr;
}

.hdc-card {
  background: var(--hdc-card);
  border: 1px solid var(--hdc-border);
  border-radius: var(--hdc-radius);
  box-shadow: var(--hdc-shadow);
  overflow: hidden;
  padding: clamp(16px, 3vw, 26px);
}

.hdc-section-title {
  align-items: center;
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}

.hdc-section-title span {
  align-items: center;
  background: var(--hdc-accent);
  border-radius: 12px;
  color: var(--hdc-primary-2);
  display: inline-flex;
  height: 36px;
  justify-content: center;
  width: 36px;
}

.hdc-section-title h3,
.hdc-next-dates h4 {
  color: var(--hdc-text);
  font-size: 1.08rem;
  margin: 0;
}

.hdc-gap-top {
  margin-top: 24px;
}

.hdc-form {
  display: block;
}

.hdc-two {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
  margin-bottom: 14px;
}

.hdc-field,
.hdc-fieldset {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.hdc-fieldset {
  border: 1px solid var(--hdc-border);
  border-radius: 18px;
  margin: 0 0 14px;
  padding: 14px;
}

.hdc-fieldset legend,
.hdc-label {
  color: var(--hdc-text);
  font-size: 0.88rem;
  font-weight: 800;
}

.hdc-calculator input[type="date"],
.hdc-calculator input[type="number"],
.hdc-calculator select,
.hdc-calculator textarea {
  background: var(--hdc-card-2);
  border: 1px solid var(--hdc-border);
  border-radius: 14px;
  color: var(--hdc-text);
  font: inherit;
  min-height: 46px;
  padding: 11px 12px;
  width: 100%;
}

.hdc-calculator textarea {
  min-height: 84px;
  resize: vertical;
}

.hdc-help {
  color: var(--hdc-muted);
  font-size: 0.82rem;
}

.hdc-radio-card {
  align-items: center;
  background: var(--hdc-card-2);
  border: 1px solid var(--hdc-border);
  border-radius: 15px;
  cursor: pointer;
  display: flex;
  gap: 10px;
  padding: 12px;
}

.hdc-radio-card + .hdc-radio-card {
  margin-top: 8px;
}

.hdc-radio-card input,
.hdc-switch input,
.hdc-weekdays input {
  accent-color: var(--hdc-primary);
}

.hdc-switch {
  align-items: center;
  background: var(--hdc-card-2);
  border: 1px solid var(--hdc-border);
  border-radius: 15px;
  cursor: pointer;
  display: flex;
  gap: 10px;
  margin-bottom: 10px;
  padding: 12px;
}

.hdc-weekdays {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.hdc-weekdays label {
  align-items: center;
  background: var(--hdc-card-2);
  border: 1px solid var(--hdc-border);
  border-radius: 999px;
  cursor: pointer;
  display: flex;
  gap: 7px;
  justify-content: center;
  min-height: 42px;
  padding: 8px 10px;
}

.hdc-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.hdc-actions .hdc-btn {
  flex: 1 1 145px;
}

.hdc-status {
  background: var(--hdc-card-2);
  border: 1px solid var(--hdc-border);
  border-left: 5px solid var(--hdc-primary);
  border-radius: 16px;
  color: var(--hdc-text);
  font-weight: 700;
  margin-bottom: 16px;
  padding: 12px 14px;
}

.hdc-status.hdc-error {
  border-left-color: var(--hdc-danger);
  color: var(--hdc-danger);
}

.hdc-status.hdc-success {
  border-left-color: var(--hdc-success);
}

.hdc-result-cards {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}

.hdc-result-card {
  background: var(--hdc-card-2);
  border: 1px solid var(--hdc-border);
  border-radius: 18px;
  padding: 15px;
}

.hdc-result-card span {
  color: var(--hdc-muted);
  display: block;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  margin-bottom: 4px;
  text-transform: uppercase;
}

.hdc-result-card strong {
  color: var(--hdc-text);
  display: block;
  font-size: clamp(1.15rem, 4vw, 1.6rem);
  letter-spacing: -0.03em;
}

.hdc-highlight {
  background: linear-gradient(135deg, var(--hdc-primary), var(--hdc-primary-2));
  border-color: transparent;
}

.hdc-highlight span,
.hdc-highlight strong {
  color: var(--hdc-card);
}

.hdc-chart-wrap {
  background: var(--hdc-card-2);
  border: 1px solid var(--hdc-border);
  border-radius: 18px;
  margin-top: 16px;
  overflow: hidden;
  padding: 10px;
}

.hdc-chart-wrap canvas {
  display: block;
  height: auto;
  max-width: 100%;
  width: 100%;
}

.hdc-table-wrap {
  border: 1px solid var(--hdc-border);
  border-radius: 18px;
  margin-top: 16px;
  overflow-x: auto;
}

.hdc-table {
  border-collapse: collapse;
  min-width: 560px;
  width: 100%;
}

.hdc-table th,
.hdc-table td {
  border-bottom: 1px solid var(--hdc-border);
  color: var(--hdc-text);
  padding: 12px;
  text-align: left;
  vertical-align: top;
}

.hdc-table th {
  background: var(--hdc-card-2);
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.hdc-table tbody tr:last-child td {
  border-bottom: 0;
}

.hdc-next-dates {
  margin-top: 16px;
}

.hdc-date-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.hdc-date-pills span {
  background: var(--hdc-card-2);
  border: 1px solid var(--hdc-border);
  border-radius: 999px;
  color: var(--hdc-text);
  font-weight: 800;
  padding: 8px 11px;
}

@media (min-width: 560px) {
  .hdc-weekdays {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .hdc-result-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .hdc-grid {
    align-items: start;
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  }

  .hdc-two {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .hdc-result-cards {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .hdc-header {
    flex-direction: column;
  }

  .hdc-theme-toggle {
    width: 100%;
  }

  .hdc-actions .hdc-btn {
    flex-basis: 100%;
    width: 100%;
  }
}

@media print {
  body * {
    visibility: hidden !important;
  }

  .hdc-calculator,
  .hdc-calculator * {
    visibility: visible !important;
  }

  .hdc-calculator {
    background: #ffffff !important;
    color: #111827 !important;
    left: 0;
    max-width: none;
    position: absolute;
    top: 0;
    width: 100%;
  }

  .hdc-actions,
  .hdc-theme-toggle {
    display: none !important;
  }

  .hdc-card,
  .hdc-header {
    box-shadow: none !important;
  }
}