.icon { width: 1.25rem; height: 1.25rem; flex: 0 0 auto; fill: none; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; stroke-width: 1.8; }
.icon-lg { width: 1.55rem; height: 1.55rem; }
.icon-xl { width: 2rem; height: 2rem; }
.brand-lockup { display: inline-flex; align-items: center; gap: var(--space-3); text-decoration: none; }
.brand-symbol {
  display: grid;
  width: 2.9rem;
  height: 2.9rem;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, .44);
  border-radius: 1rem;
  background: linear-gradient(145deg, #68efbd, #00a878 62%, #007556);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .56), 0 10px 26px rgba(0, 168, 120, .26);
  color: #041d14;
}
.brand-symbol svg { width: 1.45rem; height: 1.45rem; fill: currentColor; stroke: none; }
.brand-name { display: grid; color: var(--text-primary); font-weight: 900; line-height: 1; letter-spacing: -.03em; }
.brand-name small { color: var(--volt-accent-strong); font-size: .6rem; letter-spacing: .18em; }
.auth-branding .brand-name { color: #0b2b20; }
:root[data-theme="dark"] .auth-branding .brand-name { color: #f3fff9; }

.eyebrow { margin: 0; color: var(--volt-accent-strong); font-size: var(--font-size-xs); font-weight: 850; letter-spacing: .14em; text-transform: uppercase; }
.supporting-copy { margin: 0; color: var(--text-secondary); }
.muted { color: var(--text-secondary); }
.page h1, .page h2, .page h3, .card h2, .card h3 { margin: 0; line-height: var(--line-tight); letter-spacing: -.025em; }
.page-header h1 { font-size: var(--font-size-xl); }

.card {
  padding: clamp(1rem, 2vw, 1.45rem);
  overflow: hidden;
  border-radius: var(--radius-lg);
}

.card-header,
.section-heading,
.settings-heading,
.dialog-heading,
.profile-row,
.reading-item,
.alert-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.section-heading { align-items: flex-end; }
.section-heading-copy { display: grid; gap: var(--space-1); }
.metric-value { display: block; font-size: var(--font-size-metric); font-weight: 900; line-height: .96; letter-spacing: -.055em; }
.metric-caption { color: var(--text-secondary); font-size: var(--font-size-sm); }
.metric-delta { display: inline-flex; align-items: center; gap: var(--space-1); color: var(--volt-success); font-size: var(--font-size-xs); font-weight: 800; }

.chip,
.status-pill {
  display: inline-flex;
  min-height: 1.9rem;
  padding: .35rem .65rem;
  align-items: center;
  gap: .35rem;
  border: 1px solid var(--glass-border-strong);
  border-radius: var(--radius-pill);
  background: var(--glass-control);
  color: var(--text-secondary);
  font-size: var(--font-size-xs);
  font-weight: 750;
  white-space: nowrap;
}
.status-pill[data-tone="success"] { color: var(--volt-success); }
.status-pill[data-tone="warning"] { color: var(--volt-warning); }
.status-pill[data-tone="danger"] { color: var(--volt-danger); }

.primary-button,
.secondary-button,
.ghost-button,
.text-button,
.icon-button,
.nav-button,
.segment-button,
.mobile-nav-button {
  min-height: var(--touch-target);
  border: 0;
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast) var(--ease-standard), background var(--duration-fast) var(--ease-standard), border-color var(--duration-fast) var(--ease-standard), transform var(--duration-fast) var(--ease-standard), box-shadow var(--duration-fast) var(--ease-standard);
}
.primary-button,
.secondary-button,
.ghost-button,
.text-button { display: inline-flex; padding: .7rem 1rem; align-items: center; justify-content: center; gap: var(--space-2); font-weight: 800; }
.primary-button { background: linear-gradient(145deg, color-mix(in srgb, var(--volt-accent) 78%, white), var(--volt-accent)); color: var(--text-on-accent); box-shadow: 0 10px 24px color-mix(in srgb, var(--volt-accent) 28%, transparent), inset 0 1px 0 rgba(255, 255, 255, .42); }
:root[data-theme="dark"] .primary-button { color: #052117; }
.secondary-button { border: 1px solid var(--glass-border-strong); background: var(--glass-control); color: var(--text-primary); box-shadow: inset 0 1px 0 var(--glass-highlight); }
.ghost-button { border: 1px solid transparent; background: transparent; color: var(--text-secondary); }
.text-button { min-height: 2rem; padding: .25rem; background: transparent; color: var(--volt-accent-strong); }
.compact { min-height: 2.35rem; padding: .45rem .75rem; font-size: var(--font-size-sm); }
.icon-button { display: grid; width: var(--touch-target); padding: 0; place-items: center; border: 1px solid var(--glass-border); background: var(--glass-control); color: var(--text-primary); box-shadow: inset 0 1px 0 var(--glass-highlight); }
.primary-button:hover, .secondary-button:hover, .icon-button:hover { transform: translateY(-1px); }
.primary-button:active, .secondary-button:active, .icon-button:active { transform: scale(.98); }

.form { display: grid; width: 100%; gap: var(--space-4); text-align: left; }
.form label { display: grid; gap: var(--space-2); color: var(--text-secondary); font-size: var(--font-size-sm); }
.form label > span:first-child { font-weight: 720; }
input, select, textarea {
  width: 100%;
  min-height: var(--touch-target);
  padding: .72rem .85rem;
  border: 1px solid var(--glass-border-strong);
  border-radius: var(--radius-sm);
  background: var(--glass-control);
  color: var(--text-primary);
  box-shadow: inset 0 1px 0 var(--glass-highlight);
}
input::placeholder, textarea::placeholder { color: var(--text-tertiary); }
input[readonly] { color: var(--text-secondary); }
.input-with-icon { position: relative; }
.input-with-icon .icon { position: absolute; top: 50%; left: .85rem; color: var(--text-tertiary); transform: translateY(-50%); pointer-events: none; }
.input-with-icon input { padding-left: 2.8rem; }
.checkbox-row { display: grid !important; grid-template-columns: auto 1fr; align-items: center; }
.checkbox-row input { width: 1.15rem; min-height: 1.15rem; accent-color: var(--volt-accent); }
.two-columns { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.form-actions { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-3); }
fieldset { display: grid; margin: 0; padding: var(--space-4); gap: var(--space-3); border: 1px solid var(--glass-border-strong); border-radius: var(--radius-md); }
legend { padding: 0 var(--space-2); font-weight: 800; }
.status-message { min-height: 1.3rem; margin: 0; color: var(--text-secondary); font-size: var(--font-size-sm); }
.status-message[data-error="true"], .fatal-message { color: var(--volt-danger); }
.auth-progress {
  height: .25rem;
  overflow: hidden;
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--volt-accent) 18%, transparent);
}
.auth-progress span {
  display: block;
  width: 42%;
  height: 100%;
  border-radius: inherit;
  background: var(--volt-accent);
  animation: auth-progress 1.1s var(--ease-standard) infinite alternate;
}

@keyframes auth-progress {
  from { transform: translateX(-12%); }
  to { transform: translateX(150%); }
}

.desktop-nav { display: grid; align-content: start; gap: var(--space-1); padding: var(--space-8) 0; }
.nav-button { display: flex; width: 100%; padding: .72rem .85rem; align-items: center; gap: var(--space-3); background: transparent; color: var(--text-secondary); font-weight: 750; text-align: left; }
.nav-button:hover { background: color-mix(in srgb, var(--glass-control) 80%, transparent); color: var(--text-primary); }
.nav-button[aria-current="page"] { background: var(--volt-accent-soft); color: var(--volt-accent-strong); box-shadow: inset 0 1px 0 color-mix(in srgb, var(--glass-highlight) 70%, transparent); }
.sidebar-footer { display: grid; gap: var(--space-3); }
.profile-row { justify-content: flex-start; padding: var(--space-3); border-radius: var(--radius-md); background: color-mix(in srgb, var(--glass-control) 72%, transparent); }
.profile-avatar { display: grid; width: 2.5rem; height: 2.5rem; flex: 0 0 auto; place-items: center; border-radius: 50%; background: linear-gradient(145deg, var(--volt-accent-soft), color-mix(in srgb, var(--volt-accent) 36%, transparent)); color: var(--volt-accent-strong); font-weight: 900; }
.profile-copy { min-width: 0; }
.profile-copy strong, .profile-copy small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.profile-copy small { color: var(--text-secondary); font-size: var(--font-size-xs); }

.topbar-actions { display: flex; align-items: center; gap: var(--space-2); }
.topbar-context { display: flex; min-width: 0; align-items: center; gap: var(--space-4); }
.topbar-context h1 { margin: 0; font-size: var(--font-size-lg); }

.mobile-nav-button { display: grid; min-width: 0; padding: .35rem .15rem; place-items: center; gap: .1rem; background: transparent; color: var(--text-tertiary); font-size: .65rem; font-weight: 800; }
.mobile-nav-button .icon { width: 1.35rem; height: 1.35rem; }
.mobile-nav-button[aria-current="page"] { color: var(--volt-accent-strong); }
.mobile-nav-button.reading-action { position: relative; color: var(--text-primary); }
.mobile-nav-button.reading-action .reading-action-icon { display: grid; width: 3.25rem; height: 3.25rem; margin-top: -1.75rem; place-items: center; border: 1px solid rgba(255, 255, 255, .48); border-radius: 50%; background: linear-gradient(145deg, #68efbd, var(--volt-accent)); color: #052117; box-shadow: 0 12px 30px rgba(0, 168, 120, .34), inset 0 1px 0 rgba(255, 255, 255, .6); }

.segmented-control { display: inline-flex; padding: .25rem; gap: .2rem; border: 1px solid var(--glass-border); border-radius: var(--radius-pill); background: var(--glass-1); }
.segment-button { min-height: 2.2rem; padding: .4rem .8rem; background: transparent; color: var(--text-secondary); font-size: var(--font-size-sm); font-weight: 800; }
.segment-button[aria-pressed="true"] { background: var(--glass-elevated); color: var(--volt-accent-strong); box-shadow: var(--glass-shadow-control); }

.progress-track { height: .45rem; overflow: hidden; border-radius: var(--radius-pill); background: color-mix(in srgb, var(--text-tertiary) 16%, transparent); }
.progress-fill { display: block; width: var(--progress, 0%); height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--volt-accent), color-mix(in srgb, var(--volt-accent) 65%, white)); transition: width var(--duration-normal) var(--ease-standard); }
.energy-glass .progress-fill { background: linear-gradient(90deg, var(--volt-energy-strong), var(--volt-energy)); }
.water-glass .progress-fill { background: linear-gradient(90deg, var(--volt-water-strong), var(--volt-water)); }

.empty-state { display: grid; min-height: 15rem; padding: var(--space-8); place-items: center; align-content: center; gap: var(--space-3); text-align: center; border: 1px dashed var(--glass-border-strong); border-radius: var(--radius-lg); background: color-mix(in srgb, var(--glass-1) 78%, transparent); }
.empty-state .icon { width: 2.5rem; height: 2.5rem; color: var(--volt-accent-strong); }

dialog { width: min(calc(100% - 2rem), 38rem); max-height: min(90vh, 56rem); max-height: min(90dvh, 56rem); padding: 0; overflow: visible; border: 0; border-radius: var(--radius-xl); background: transparent; color: var(--text-primary); }
dialog::backdrop { background: rgba(0, 10, 7, .62); -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px); }
.dialog-card { max-height: min(90vh, 56rem); max-height: min(90dvh, 56rem); padding: clamp(1rem, 3vw, 1.6rem); overflow: auto; border-radius: var(--radius-xl); }
.dialog-heading { position: sticky; z-index: 2; top: 0; padding-bottom: var(--space-3); background: linear-gradient(var(--glass-modal) 75%, transparent); }
.dialog-heading h2 { margin: 0; }

.sheet-menu { display: grid; gap: var(--space-2); }
.sheet-menu .nav-button { border: 1px solid var(--glass-border); background: var(--glass-control); }
.sheet-profile { margin-bottom: var(--space-4); }

@media (max-width: 767px) {
  .two-columns { grid-template-columns: 1fr; }
  .card { border-radius: var(--radius-md); }
  dialog { width: 100%; max-width: none; margin: auto 0 0; border-radius: var(--radius-xl) var(--radius-xl) 0 0; }
  .dialog-card { max-height: calc(92dvh - var(--safe-top)); padding-bottom: calc(var(--space-6) + var(--safe-bottom)); border-radius: var(--radius-xl) var(--radius-xl) 0 0; }
}