/* ===== DATE CALCULATOR PAGE STYLES ===== */

.calc-main {
  flex: 1; width: 100%; max-width: 1024px;
  margin: 0 auto; padding: 2rem 1rem 6rem;
}
@media (min-width: 640px) { .calc-main { padding: 3rem 1.5rem 6rem; } }

.calc-header { max-width: 42rem; margin-bottom: 2rem; }
@media (min-width: 640px) { .calc-header { margin-bottom: 3rem; } }
.calc-header h1 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 500; letter-spacing: -0.02em; line-height: 1.15;
  margin-bottom: 0.5rem; color: var(--fg);
}
.calc-header p {
  font-size: 0.875rem; color: var(--muted-fg); line-height: 1.6;
}
@media (min-width: 640px) { .calc-header p { font-size: 1rem; } }

/* TABS */
.tabs-scroll-wrap {
  overflow-x: auto; margin: 0 -1rem; padding: 0 1rem 1rem;
  border-bottom: 1px solid var(--border);
  scrollbar-width: none;
}
.tabs-scroll-wrap::-webkit-scrollbar { display: none; }
@media (min-width: 640px) { .tabs-scroll-wrap { margin: 0 -1.5rem; padding: 0 1.5rem 1rem; } }

.tabs-bar {
  display: flex; gap: 0.5rem; flex-wrap: nowrap;
}
.tab-btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.5rem 0.75rem; border-radius: 999px;
  font-size: 0.75rem; font-weight: 500;
  white-space: nowrap; cursor: pointer;
  background: var(--card); border: 1px solid var(--border);
  color: var(--muted-fg); transition: all 0.15s; flex-shrink: 0;
}
@media (min-width: 640px) {
  .tab-btn { padding: 0.6rem 1.25rem; font-size: 0.85rem; gap: 0.5rem; }
}
.tab-btn svg { width: 0.9rem; height: 0.9rem; flex-shrink: 0; }
@media (min-width: 640px) { .tab-btn svg { width: 1rem; height: 1rem; } }
.tab-btn:hover { background: var(--accent); color: var(--fg); }
.tab-btn.active {
  background: var(--primary); color: var(--primary-fg);
  border-color: var(--primary); box-shadow: var(--shadow-sm);
}

/* TAB PANELS */
.tab-panels { margin-top: 1.5rem; }
@media (min-width: 640px) { .tab-panels { margin-top: 2rem; } }
.tab-panel { display: none; animation: fadeUp 0.35s ease both; }
.tab-panel.active { display: block; }

/* DATE ROW */
.date-row { display: grid; grid-template-columns: 1fr; gap: 1rem; margin-bottom: 1rem; }
@media (min-width: 640px) { .date-row { grid-template-columns: 1fr 1fr; gap: 1.5rem; margin-bottom: 1.5rem; } }

.field label {
  display: block; font-size: 0.65rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--muted-fg); margin-bottom: 0.4rem;
}

.date-input-wrap {
  display: flex; align-items: center; gap: 0.6rem;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 0.5rem; padding: 0 1rem; height: 3rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.date-input-wrap:focus-within {
  border-color: var(--primary); box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
}
.date-input-wrap svg { width: 1rem; height: 1rem; color: var(--muted-fg); flex-shrink: 0; }
.date-input-wrap input[type="date"] {
  flex: 1; border: none; outline: none; background: transparent;
  font-family: 'DM Sans', sans-serif; font-size: 0.875rem;
  color: var(--fg); height: 100%;
}
.date-input-wrap input[type="date"]::-webkit-calendar-picker-indicator {
  filter: invert(0.5); cursor: pointer;
}
[data-theme="light"] .date-input-wrap input[type="date"]::-webkit-calendar-picker-indicator {
  filter: none;
}

.num-input {
  width: 100%; height: 3rem; border-radius: 0.5rem;
  border: 1px solid var(--border); background: var(--card);
  color: var(--fg); font-family: 'DM Sans', sans-serif;
  font-size: 0.875rem; padding: 0 1rem; outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.num-input:focus {
  border-color: var(--primary); box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
}

/* OPTIONS BAR */
.options-bar {
  display: flex; flex-wrap: wrap; gap: 1rem 1.5rem;
  align-items: center; padding: 1rem;
  background: var(--muted); border-radius: 0.75rem;
  border: 1px solid var(--border); margin-bottom: 1.5rem;
}

/* SWITCH */
.switch-row { display: flex; align-items: center; gap: 0.75rem; }
.switch-row label { font-size: 0.85rem; font-weight: 500; cursor: pointer; }
.switch-track {
  width: 36px; height: 20px; border-radius: 999px; border: none;
  background: var(--toggle-bg); cursor: pointer; position: relative;
  transition: background 0.2s; padding: 0; flex-shrink: 0;
}
.switch-track[aria-checked="true"] { background: var(--primary); }
.switch-thumb {
  position: absolute; top: 2px; left: 2px;
  width: 16px; height: 16px; border-radius: 50%;
  background: #fff; transition: transform 0.2s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}
.switch-track[aria-checked="true"] .switch-thumb { transform: translateX(16px); }

/* RESULT CARDS */
.result-area { margin-top: 1.5rem; }

.result-hero-card {
  position: relative; overflow: hidden;
  border-radius: 0.75rem; border: 1px solid rgba(59,130,246,0.2);
  background: rgba(59,130,246,0.05); padding: 1.25rem;
  box-shadow: var(--shadow-sm); margin-bottom: 1rem;
}
@media (min-width: 640px) { .result-hero-card { padding: 2rem; } }

.result-hero-bg {
  position: absolute; top: 1rem; right: 1rem;
  opacity: 0.08; pointer-events: none;
}
@media (min-width: 640px) { .result-hero-bg { top: 1.5rem; right: 1.5rem; } }
.result-hero-bg svg { width: 5rem; height: 5rem; color: var(--primary); }
@media (min-width: 640px) { .result-hero-bg svg { width: 8rem; height: 8rem; } }

.result-label {
  font-size: 0.85rem; font-weight: 500; color: var(--primary); margin-bottom: 0.25rem;
}
.result-big {
  display: flex; align-items: baseline; gap: 0.5rem;
}
.result-big span:first-child {
  font-family: 'Playfair Display', serif;
  font-size: clamp(2.5rem, 6vw, 3.75rem); letter-spacing: -0.02em; color: var(--fg);
}
.result-unit {
  font-size: 1.1rem; color: var(--muted-fg); font-weight: 500;
}
@media (min-width: 640px) { .result-unit { font-size: 1.25rem; } }

.result-small-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.75rem;
}
@media (min-width: 640px) { .result-small-grid { gap: 1rem; } }

.result-small-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 0.75rem; padding: 1rem 1.25rem;
  display: flex; flex-direction: column; box-shadow: var(--shadow-sm);
}
.result-small-label {
  font-size: 0.7rem; color: var(--muted-fg); margin-bottom: 0.25rem;
}
@media (min-width: 640px) { .result-small-label { font-size: 0.8rem; } }
.result-small-val {
  font-family: 'Playfair Display', serif;
  font-size: 1.25rem; color: var(--fg);
}
@media (min-width: 640px) { .result-small-val { font-size: 1.5rem; } }