:root {
  --card-bg: var(--surface);
  --card-border: var(--border);
  --input-bg: var(--surface-2);
  --input-border: var(--border);
  --focus-ring: var(--primary);
  --card-radius: 25px;
  --card-padding: 32px;
}

/* Hero uses shared styles from styles.css (flag-viewer 기준) */

.calc-grid {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* Column layout helper for Date Calculator specific structure */
.calc-column {
  display: contents;
}

.calc-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  padding: var(--card-padding);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 24px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.calc-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.1);
  border-color: rgba(var(--primary-rgb, 106, 167, 255), 0.4);
}

.card-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
  margin-bottom: 4px;
}

.card-header h3 {
  margin: 0 0 8px;
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text);
}

.card-header h4 {
  margin: 0 0 8px;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
}

.card-header p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* Common Field Styles */
.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
}

.field-label {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--muted);
  margin-left: 4px;
}

.field-stack {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.field-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}

.field-row--paired {
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
}

.field-row--single {
  grid-template-columns: 1fr;
}

/* Inputs & Selects */
.field input:not([type="checkbox"]):not([type="radio"]),
.field select {
  width: 100%;
  padding: 16px 20px;
  border-radius: 25px;
  border: 1px solid var(--input-border);
  background: var(--input-bg);
  color: var(--text);
  font-size: 1.02rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

.field select option,
.field select optgroup {
  background: var(--surface);
  color: var(--text);
  padding: 8px 12px;
}

.field input:focus,
.field select:focus {
  outline: none;
  background: var(--bg);
  border-color: var(--focus-ring);
  box-shadow: 0 0 0 4px rgba(106, 167, 255, 0.1);
}

/* Date Components */
.date-input {
  width: 100%;
}

.date-selects {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 8px;
}

.date-selects .custom-select-wrapper,
.time-selects .custom-select-wrapper,
.field .custom-select-wrapper {
  width: 100%;
}

.date-selects .select-selected,
.time-selects .select-selected,
.field .select-selected {
  width: 100%;
}

.time-selects {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.datetime-input {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}

.check {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 4px 0;
    cursor: pointer;
    user-select: none;
    justify-content: center;
}

.check input {
  width: 20px;
  height: 20px;
  accent-color: var(--primary);
}

.check span {
  font-size: 0.95rem;
  color: var(--text);
}

/* Result Grid for Dates */
.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 14px;
  margin-top: 8px;
}

.result-item {
  background: var(--surface-2);
  border-radius: 22px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: center;
  justify-content: center;
  text-align: center;
  border: 1px solid var(--border);
}

.result-item:hover {
  border-color: rgba(var(--primary-rgb, 106, 167, 255), 0.4);
}

.result-block {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: center;
  text-align: center;
}

.result-label {
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 600;
}

.result-value {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--primary);
  font-feature-settings: "tnum";
}

/* Large result section (e.g. for final date) */
.result-large {
  background: var(--surface-2);
  border-radius: 16px;
  padding: 24px;
  text-align: center;
  margin-top: 8px;
}

.result-large .result-label {
  display: block;
  margin-bottom: 8px;
}

.result-large .result-value {
  font-size: 1.8rem;
}

.result-line {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

/* Time Convert Results Layout */
.time-convert-results {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.result-item--full {
  width: 100%;
  grid-column: 1 / -1;
}

.result-grid--time-convert {
  grid-template-columns: repeat(4, 1fr);
}

.result-day {
  display: block;
  font-size: 1rem;
  color: var(--muted);
  margin-top: 4px;
}

@media (max-width: 768px) {
  .hero {
    margin: 20px 0 30px;
    text-align: left;
  }
 
  .calc-grid {
    grid-template-columns: 1fr;
  }

  .date-selects {
    grid-template-columns: 1fr;
  }

  .datetime-input {
    grid-template-columns: 1fr;
  }
  
  /* ✨ Fix result-grid wrapping issue */
  .result-grid,
  .result-grid--time-convert {
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 12px;
  }
}