/* Theme variables (default: dark) */
:root {
  --bg: #0f172a;
  --card: #111827;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --accent: #22c55e;
  --danger: #ef4444;
  --focus: #60a5fa;
}

/* Light theme overrides */
:root[data-theme="light"] {
  --bg: #f7fafc;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --accent: #16a34a;
  --danger: #b91c1c;
  --focus: #2563eb;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica,
    Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: radial-gradient(
    1200px 800px at 80% -10%,
    #1f2937 0%,
    var(--bg) 60%
  );
  color: var(--text);
}

:root[data-theme="light"] body {
  background: radial-gradient(
    1200px 800px at 80% -10%,
    #e2e8f0 0%,
    var(--bg) 60%
  );
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 20px 72px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

h1 {
  margin: 0 0 24px;
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.theme-toggle {
  position: fixed;
  top: calc(16px + env(safe-area-inset-top));
  right: calc(16px + env(safe-area-inset-left));
  z-index: 1000;
  margin: 0;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  background: linear-gradient(180deg, #f8fafc, #e2e8f0);
  color: #0f172a;
  font-weight: 700;
  cursor: pointer;
}

:root[data-theme="light"] .theme-toggle {
  background: linear-gradient(180deg, #0ea5e9, #0284c7);
  color: #ecfeff;
  border-color: rgba(255, 255, 255, 0.28);
}

form {
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.04),
    rgba(255, 255, 255, 0.02)
  );
  border: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(6px);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

:root[data-theme="light"] form {
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.02), rgba(0, 0, 0, 0));
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

.label {
  display: inline-block;
  margin-bottom: 8px;
  font-weight: 600;
}

.input-container {
    padding: 8px 0px;
    /* Add any other styling, like a border, here */
}

input[type="date"] {
  display: block;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: #0b1220;
  color: var(--text);
  outline: none;
}

:root[data-theme="light"] input[type="date"] {
  border: 1px solid rgba(15, 23, 42, 0.12);
  background: #ffffff;
  color: var(--text);
}

input[type="date"]:focus {
  border-color: var(--focus);
  box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.25);
}

.help {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.error {
  margin: 6px 0 0;
  color: var(--danger);
  font-size: 14px;
  min-height: 1.2em;
}

button {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: linear-gradient(180deg, #22c55e, #16a34a);
  color: #052e12;
  font-weight: 700;
  cursor: pointer;
}

:root[data-theme="light"] button {
  border: 1px solid rgba(15, 23, 42, 0.12);
  background: linear-gradient(180deg, #22c55e, #16a34a);
  color: #052e12;
}

button:hover {
  filter: brightness(1.05);
}
button:active {
  transform: translateY(1px);
}

.results {
  margin-top: 24px;
  background: #0b1220;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  padding: 16px;
}

:root[data-theme="light"] .results {
  background: #ffffff;
  border: 1px solid rgba(15, 23, 42, 0.08);
}

.results h2 {
  margin: 0 0 12px;
  font-size: 18px;
  color: var(--muted);
  font-weight: 600;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.result-item {
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.04),
    rgba(255, 255, 255, 0.02)
  );
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 12px;
  padding: 16px;
  text-align: center;
}

:root[data-theme="light"] .result-item {
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.02), rgba(0, 0, 0, 0));
  border: 1px solid rgba(15, 23, 42, 0.06);
}

.value {
  display: block;
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
}

.unit {
  display: block;
  font-size: 13px;
  color: var(--muted);
}

@media (max-width: 520px) {
  .result-grid {
    grid-template-columns: 1fr;
  }
}