:root {
  --transition: 180ms ease;
  color-scheme: dark;
  --bg-page: #040510;
  --bg-surface: #080b1c;
  --bg-surface-strong: #0b1026;
  --bg-elevated: rgba(13, 18, 42, 0.92);
  --bg-muted: rgba(20, 26, 54, 0.78);
  --surface-highlight: rgba(34, 40, 80, 0.75);
  --border-soft: rgba(129, 140, 248, 0.22);
  --border-strong: rgba(99, 102, 241, 0.48);
  --text-primary: #e8ebff;
  --text-secondary: rgba(232, 235, 255, 0.7);
  --accent-primary: #6366f1;
  --accent-primary-soft: rgba(99, 102, 241, 0.18);
  --accent-secondary: #f97316;
  --accent-secondary-soft: rgba(249, 115, 22, 0.2);
  --accent-tertiary: #22d3ee;
  --mwat-accent: #818cf8;
  --daily-accent: #fb923c;
  --focus-ring: rgba(129, 140, 248, 0.38);
  --success-soft: rgba(34, 197, 94, 0.22);
  --success-strong: #bbf7d0;
  --error-soft: rgba(248, 113, 113, 0.2);
  --error-strong: #fecaca;
  /* Shared gradient for hero + cards */
  --card-gradient: var(--surface-gradient-primary);
}

body.has-mobile-nav-open {
  overflow: hidden;
}

/* Page background + base text to match dashboard/MWAT */
body {
  color: var(--text-primary);
  background:
    radial-gradient(circle at 18% 20%, rgba(88, 132, 255, 0.22), transparent 58%),
    radial-gradient(circle at 82% 18%, rgba(48, 196, 255, 0.16), transparent 55%),
    radial-gradient(circle at 70% 84%, rgba(60, 120, 235, 0.14), transparent 60%),
    var(--bg-page) !important;
}

/* Layout wrapper spacing similar to .page */
.wt-container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4.5rem;
}

.wt-container > * + * {
  margin-top: 2.75rem;
}

/* Hero */
.wt-tagline {
  color: var(--text-secondary) !important;
}

/* Dark card look to match MWAT cards */
.wt-card {
  background: var(--card-gradient) !important;
  border-radius: 22px !important;
  padding: 2rem clamp(1.25rem, 3vw, 2.5rem);
  box-shadow: 0 28px 60px rgba(3, 7, 18, 0.65) !important;
  border: 1px solid var(--border-soft) !important;
  backdrop-filter: blur(12px);
  color: var(--text-primary) !important;
}

.wt-card h3,
.wt-card h4 {
  color: #f8faff !important;
}

.wt-card--success {
  border-left: 5px solid var(--success-strong);
}

.wt-card--warning {
  border-left: 4px solid var(--accent-secondary);
}

.wt-card--error {
  border-left: 5px solid var(--error-strong);
}

/* Inputs and labels legibility on dark */
.wt-label { color: var(--text-primary) !important; }
.wt-input { color: #e8ebff; background: rgba(8, 11, 28, 0.75); border: 1px solid var(--border-soft); border-radius: 10px; padding: 0.6rem 0.75rem; }
.wt-input::placeholder { color: rgba(232, 235, 255, 0.45); }
.wt-input:focus { outline: none; box-shadow: 0 0 0 3px var(--focus-ring); border-color: var(--border-strong); }

/* Buttons tuned to accent */
.wt-btn {
  background: rgba(129, 140, 248, 0.2);
  border: 1px solid rgba(129, 140, 248, 0.35);
  color: #edefff;
}
.wt-btn:hover:not(:disabled) {
  background: rgba(129, 140, 248, 0.35);
  border-color: rgba(129, 140, 248, 0.55);
  color: #f8faff;
}
.wt-btn-primary { background: rgba(129,140,248,0.28); border: 1px solid rgba(129,140,248,0.55); }
.wt-btn-primary:hover:not(:disabled) { background: rgba(129,140,248,0.4); }

.result-highlight {
  font-size: 2.5rem;
  font-weight: var(--font-weight-black);
  color: var(--success-strong);
  margin-bottom: var(--space-3);
  text-align: center;
}

.result-secondary {
  font-size: 2rem;
  font-weight: var(--font-weight-bold);
  color: var(--accent-tertiary);
  margin-bottom: var(--space-4);
  text-align: center;
}

.result-context {
  text-align: center;
  color: var(--text-secondary);
}

/* Notification banners */
.wt-notification {
  background: var(--bg-elevated);
  border-left: 4px solid var(--accent-primary);
  box-shadow: 0 28px 60px rgba(3, 7, 18, 0.6);
  color: var(--text-primary);
  transform: translateX(140%);
  opacity: 0;
  pointer-events: none;
}

.wt-notification.show {
  transform: translateX(0);
  opacity: 1;
  pointer-events: auto;
}

.wt-notification.warning {
  border-left-color: var(--accent-secondary);
  background: var(--accent-secondary-soft);
}

.wt-notification.error {
  border-left-color: var(--error-strong);
  background: var(--error-soft);
  color: var(--error-strong);
}

/* Calculation and detail panels */
.calculation-step {
  margin: var(--space-4) 0;
  padding: var(--space-4);
  background: var(--surface-highlight);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--accent-primary);
  color: var(--text-primary);
}

.formula-display {
  background: rgba(34, 40, 80, 0.65);
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  margin: var(--space-3) 0;
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
}

.constants-info {
  margin-top: var(--space-4);
  padding: var(--space-3);
  background: var(--accent-primary-soft);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
}

.step-note {
  color: rgba(232, 235, 255, 0.65);
  margin-top: 0.5rem;
  display: block;
}

.global-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  --nav-padding: clamp(1.5rem, 4vw, 3rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: nowrap;
  gap: clamp(0.6rem, 1vw, 1rem);
  padding: 1rem var(--nav-padding);
  background: linear-gradient(135deg, rgba(14, 20, 48, 0.96), rgba(24, 30, 68, 0.92));
  border-bottom: 1px solid rgba(129, 140, 248, 0.28);
  box-shadow: 0 20px 40px rgba(3, 7, 18, 0.55);
  backdrop-filter: blur(16px);
}

.global-nav__brand {
  display: inline-flex;
  align-items: center;
  gap: clamp(0.7rem, 1vw, 1rem);
  margin-right: clamp(0.65rem, 2vw, 1.5rem);
  text-decoration: none;
  color: inherit;
  flex: 0 1 auto;
  min-width: 0;
}

.global-nav__menu-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 1.2rem;
  border-radius: 999px;
  border: 1px solid rgba(129, 140, 248, 0.35);
  background: rgba(12, 16, 36, 0.85);
  color: #f8faff;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition);
  margin-left: auto;
}

.global-nav__menu-toggle:hover,
.global-nav__menu-toggle:focus-visible {
  outline: none;
  background: rgba(18, 22, 48, 0.95);
  border-color: rgba(129, 140, 248, 0.6);
  box-shadow: 0 12px 24px rgba(99, 102, 241, 0.25);
}

.global-nav__menu-toggle-icon {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 999px;
  transition: transform var(--transition), background var(--transition);
}

.global-nav__menu-toggle-icon::before,
.global-nav__menu-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 999px;
  transition: transform var(--transition), opacity var(--transition);
}

.global-nav__menu-toggle-icon::before { transform: translateY(-6px); }
.global-nav__menu-toggle-icon::after { transform: translateY(6px); }

.global-nav--menu-open .global-nav__menu-toggle-icon { background: transparent; }
.global-nav--menu-open .global-nav__menu-toggle-icon::before { transform: rotate(45deg); }
.global-nav--menu-open .global-nav__menu-toggle-icon::after { transform: rotate(-45deg); }

.global-nav__logo {
  height: clamp(44px, 8vw, 58px);
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 8px 16px rgba(3, 7, 18, 0.55));
}

.global-nav__brand-text { display: flex; flex-direction: column; line-height: 1.2; min-width: 0; }
.global-nav__overline { font-size: clamp(0.6rem, 0.7vw, 0.72rem); letter-spacing: 0.28em; text-transform: uppercase; color: rgba(232,235,255,.62); }
.global-nav__title { font-size: clamp(0.98rem, 1.1vw + 0.7rem, 1.35rem); font-weight: 600; color: #f8faff; white-space: normal; }

.global-nav__menu {
  position: absolute;
  top: calc(100% + 0.55rem);
  left: auto;
  right: var(--nav-padding);
  width: min(360px, calc(100% - 2 * var(--nav-padding)));
  display: none;
  flex-direction: column;
  align-items: stretch;
  gap: 0.75rem;
  list-style: none;
  margin: 0;
  padding: 1.1rem 1.4rem 1.6rem;
  background: linear-gradient(135deg, rgba(14, 20, 48, 0.96), rgba(24, 30, 68, 0.92));
  border: 1px solid rgba(129, 140, 248, 0.32);
  border-radius: 20px;
  box-shadow: 0 26px 48px rgba(5, 9, 24, 0.6);
  backdrop-filter: blur(12px);
  z-index: 120;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}

.global-nav--menu-open .global-nav__menu {
  display: flex;
}

.global-nav__item { position: relative; width: 100%; }

.global-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.55rem clamp(0.85rem, 1.2vw, 1.2rem);
  border-radius: 999px;
  font-size: clamp(0.85rem, 0.55vw + 0.7rem, 1.05rem);
  font-weight: 500;
  color: rgba(232, 235, 255, 0.9);
  border: 1px solid transparent;
  text-decoration: none;
  transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
  width: 100%;
  text-align: left;
}

.global-nav__link:hover,
.global-nav__link:focus-visible {
  color: #f8faff;
  background: rgba(129, 140, 248, 0.2);
  border-color: rgba(129, 140, 248, 0.45);
  box-shadow: 0 12px 24px rgba(99, 102, 241, 0.25);
  outline: none;
}

.global-nav__link--active {
  background: rgba(129, 140, 248, 0.25);
  border-color: rgba(129, 140, 248, 0.6);
  color: #f8faff;
  box-shadow: 0 12px 24px rgba(99, 102, 241, 0.3);
}

.global-nav__toggle { background: none; cursor: pointer; }
.global-nav__caret { display:inline-block; width:0; height:0; border-left:5px solid transparent; border-right:5px solid transparent; border-top:6px solid rgba(232,235,255,.8); transition: transform .2s ease; margin-top:2px; margin-left:auto; }
.global-nav__item--open .global-nav__caret { transform: rotate(-180deg); }

.global-nav__dropdown {
  display: none;
  flex-direction: column;
  gap: 0.45rem;
  width: 100%;
  margin-top: 0.4rem;
  padding: 0.6rem;
  background: rgba(10, 14, 34, 0.9);
  border: 1px solid rgba(129, 140, 248, 0.22);
  border-radius: 16px;
  box-shadow: inset 0 0 0 1px rgba(3, 7, 18, 0.4);
}

.global-nav__item--open .global-nav__dropdown { display: flex; }

.global-nav__dropdown-link {
  display: block;
  padding: 0.65rem 1rem;
  border-radius: 12px;
  font-size: 0.9rem;
  color: rgba(232, 235, 255, 0.92);
  text-decoration: none;
  transition: background 0.18s ease, color 0.18s ease;
}

.global-nav__dropdown-link:hover,
.global-nav__dropdown-link:focus-visible { background: rgba(129,140,248,.25); color:#f8faff; outline: none; }