:root {
  color-scheme: dark;
  --bg: #020617;
  --bg-soft: #06101d;
  --surface: rgba(7, 22, 39, .94);
  --surface-alt: rgba(14, 37, 61, .82);
  --surface-raised: rgba(11, 30, 51, .98);
  --text: #f8fafc;
  --muted: #aebdcb;
  --border: rgba(96, 158, 204, .34);
  --border-strong: rgba(55, 186, 255, .68);
  --accent: #37baff;
  --accent-dark: #087ec0;
  --green: #35e57a;
  --warning: #ff7657;
  --warning-bg: rgba(115, 35, 25, .26);
  --shadow: 0 18px 48px rgba(0, 0, 0, .34);
  --radius: 18px;
  --focus: rgba(55, 186, 255, .35);
}

* { box-sizing: border-box; }
html {
  min-height: 100%;
  max-width: 100%;
  overflow-x: hidden;
  overflow-y: auto;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  background: var(--bg);
}
body {
  min-height: 100vh;
  max-width: 100%;
  margin: 0;
  overflow-x: hidden;
  overflow-y: visible;
  overscroll-behavior-y: auto;
  touch-action: pan-x pan-y;
  padding-bottom: env(safe-area-inset-bottom);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 78% 3%, rgba(0, 142, 232, .18), transparent 30rem),
    radial-gradient(circle at 14% 20%, rgba(55, 186, 255, .08), transparent 27rem),
    linear-gradient(180deg, #06111f 0%, #020617 50%, #01040a 100%);
}
.starfield {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: .56;
  background-image:
    radial-gradient(circle at 10% 15%, rgba(255,255,255,.78) 0 1px, transparent 1.3px),
    radial-gradient(circle at 28% 72%, rgba(55,186,255,.7) 0 1px, transparent 1.4px),
    radial-gradient(circle at 62% 18%, rgba(255,255,255,.5) 0 1px, transparent 1.2px),
    radial-gradient(circle at 84% 62%, rgba(255,188,96,.42) 0 1px, transparent 1.2px);
  background-size: 180px 180px, 260px 260px, 320px 320px, 420px 420px;
}
a { color: var(--accent); }
button, input, select { font: inherit; }
button { cursor: pointer; }
h1, h2, h3, p { margin-top: 0; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 1rem;
  z-index: 1000;
  padding: .75rem 1rem;
  color: #03101d;
  background: #bdeaff;
  border-radius: 10px;
}
.skip-link:focus { left: 1rem; }

.site-header {
  padding: calc(1.25rem + env(safe-area-inset-top)) max(1rem, env(safe-area-inset-right)) 4.2rem max(1rem, env(safe-area-inset-left));
  border-bottom: 1px solid rgba(96,158,204,.16);
}
.header-inner,
.page-shell,
.site-footer {
  width: min(1180px, calc(100% - 2rem));
  margin-inline: auto;
}
.header-inner {
  display: grid;
  grid-template-columns: minmax(220px, .72fr) minmax(0, 1.4fr) auto;
  align-items: center;
  gap: clamp(1rem, 3vw, 2.4rem);
}
.brand-lockup {
  display: block;
  min-width: 0;
}
.brand-lockup img {
  width: min(100%, 340px);
  display: block;
  border-radius: 8px;
}
.weather-heading { min-width: 0; }
.eyebrow,
.section-kicker {
  margin-bottom: .45rem;
  color: var(--accent);
  font-size: .75rem;
  font-weight: 900;
  letter-spacing: .15em;
  text-transform: uppercase;
}
h1 {
  margin-bottom: .45rem;
  font-size: clamp(2rem, 4.5vw, 3.6rem);
  line-height: 1;
  letter-spacing: -.045em;
}
h2 { margin-bottom: .65rem; }
.subtitle {
  max-width: 680px;
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}
.header-unit { white-space: nowrap; }

.page-shell { padding-block: 1.5rem 3rem; }
.search-panel,
.card,
.welcome-panel,
.alerts-section {
  background: linear-gradient(145deg, rgba(10, 31, 52, .96), rgba(3, 14, 25, .97));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.search-panel {
  position: relative;
  margin-top: -3.15rem;
  padding: clamp(1.25rem, 3vw, 2rem);
}
.panel-heading,
.location-heading,
.saved-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.panel-heading > div,
.location-heading > div { min-width: 0; }
.system-badge {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  padding: .65rem .85rem;
  border: 1px solid rgba(53,229,122,.25);
  border-radius: 999px;
  color: #aef7c9;
  background: rgba(53,229,122,.07);
  font-size: .78rem;
  font-weight: 800;
}
.system-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 6px var(--green), 0 0 14px rgba(53,229,122,.72);
}

.location-form label { display: block; margin-bottom: .45rem; font-weight: 750; }
.search-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: .7rem;
}
input, select {
  min-width: 0;
  color: var(--text);
  background: rgba(2, 12, 22, .88);
  border: 1px solid rgba(124, 169, 203, .55);
}
input {
  min-height: 50px;
  padding: .9rem 1rem;
  border-radius: 11px;
  font-size: 16px;
}
input::placeholder { color: #8395a6; }
input:focus,
select:focus,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}
button {
  min-height: 48px;
  padding: .85rem 1.15rem;
  color: #03101d;
  background: linear-gradient(135deg, #a6e4ff, #37baff);
  border: 0;
  border-radius: 11px;
  font-weight: 850;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}
button:hover { filter: brightness(1.08); }
button:disabled { cursor: wait; opacity: .65; }
.secondary-button {
  color: var(--text);
  background: rgba(255,255,255,.035);
  border: 1px solid rgba(122, 181, 224, .5);
}
.secondary-button:hover {
  color: #03101d;
  background: linear-gradient(135deg, #a6e4ff, #37baff);
}
.text-button {
  min-height: 44px;
  padding: .45rem .65rem;
  color: var(--accent);
  background: transparent;
}
.form-help,
.muted { color: var(--muted); }
.form-help { margin: .6rem 0 0; font-size: .9rem; }
.status-message { min-height: 1.4em; margin: .65rem 0 0; font-weight: 650; }
.status-message.error { color: #ff987e; }

.location-results,
.saved-locations-panel {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}
.location-options { display: grid; gap: .55rem; }
.location-option {
  width: 100%;
  color: var(--text);
  text-align: left;
  background: var(--surface-alt);
  border: 1px solid var(--border);
}
.saved-title-row h3 { margin-bottom: .5rem; }
.saved-locations { display: flex; flex-wrap: wrap; gap: .6rem; }
.saved-location {
  display: inline-flex;
  align-items: stretch;
  overflow: hidden;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 999px;
}
.saved-location-load,
.saved-location-remove {
  min-height: 46px;
  color: var(--text);
  background: transparent;
  border-radius: 0;
}
.saved-location-load { padding: .65rem .8rem .65rem 1rem; }
.saved-location-remove { width: 46px; padding: 0; color: var(--muted); font-size: 1.2rem; }

.weather-content { margin-top: 1.5rem; }
.location-heading { margin-bottom: 1rem; padding: .4rem .25rem; }
.dashboard-grid {
  display: grid;
  grid-template-columns: minmax(280px, .72fr) minmax(0, 1.5fr);
  gap: 1rem;
}
.card, .alerts-section { padding: 1.25rem; }
.forecast-card,
.alerts-section,
.earthquake-card,
.detailed-forecast-card { margin-top: 1rem; }

.collapsible-section { min-width: 0; overflow: hidden; }
.collapsible-section > summary {
  width: 100%;
  min-width: 0;
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  padding: .1rem 0;
  color: var(--text);
  font-size: 1.22rem;
  font-weight: 850;
  cursor: pointer;
  list-style: none;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}
.collapsible-section > summary::-webkit-details-marker { display: none; }
.collapsible-section > summary::after {
  content: "+";
  flex: 0 0 auto;
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  color: var(--accent);
  background: rgba(55,186,255,.08);
  border: 1px solid rgba(55,186,255,.25);
  border-radius: 50%;
  font-size: 1.4rem;
}
.collapsible-section[open] > summary::after { content: "−"; }
.summary-hint {
  margin-left: auto;
  color: var(--muted);
  font-size: .76rem;
  font-weight: 650;
}
.collapsible-section[open] .summary-hint { display: none; }
.collapsible-content {
  min-width: 0;
  max-width: 100%;
  padding-top: 1rem;
  overflow: hidden;
}

.current-main { display: flex; gap: 1rem; align-items: center; margin-bottom: 1rem; }
.current-icon { width: 88px; height: 88px; object-fit: contain; border-radius: 12px; }
.current-temp { font-size: clamp(2.8rem, 8vw, 4.7rem); font-weight: 850; line-height: 1; letter-spacing: -.06em; }
.current-description { margin: .3rem 0 0; font-weight: 650; }
.metrics-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: .65rem; }
.metric,
.hour-card,
.day-card,
.detailed-period,
.earthquake-summary,
.earthquake-item {
  background: rgba(255,255,255,.035);
  border: 1px solid var(--border);
}
.metric { padding: .8rem; border-radius: 12px; }
.metric-label { display: block; color: var(--muted); font-size: .78rem; }
.metric-value { display: block; margin-top: .15rem; font-weight: 800; }

.hourly-scroll {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(105px, 1fr);
  gap: .65rem;
  overflow-x: auto;
  padding-bottom: .5rem;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}
.hour-card { padding: .85rem .65rem; border-radius: 13px; text-align: center; scroll-snap-align: start; }
.hour-card img { width: 48px; height: 48px; object-fit: contain; border-radius: 8px; }
.hour-time, .hour-temp { font-weight: 850; }
.hour-detail { color: var(--muted); font-size: .78rem; }

.daily-grid {
  width: 100%;
  min-width: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .75rem;
}
.day-card { min-width: 0; padding: 1rem; overflow: hidden; border-radius: 14px; }
.day-card img { display: block; width: 68px; height: 68px; max-width: 100%; margin: .5rem auto; object-fit: contain; border-radius: 10px; }
.day-name { font-weight: 850; }
.day-temp { font-size: 1.35rem; font-weight: 850; }
.day-summary { color: var(--muted); font-size: .86rem; }
.day-name, .day-summary, .day-card .hour-detail { overflow-wrap: anywhere; }

.alerts-section {
  border-left: 6px solid #ff7657;
  background: linear-gradient(145deg, rgba(91,29,22,.75), rgba(40,16,20,.92));
}
.alerts-section > summary,
.alert-item h3 { color: #ffad98; }
.alert-item + .alert-item { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid rgba(255,173,152,.22); }
.alert-meta { color: #e3ad9f; font-size: .88rem; }

.detailed-forecast-list { display: grid; gap: .8rem; min-width: 0; }
.detailed-period { padding: 1rem; border-radius: 14px; overflow-wrap: anywhere; }
.detailed-period-heading { display: flex; justify-content: space-between; align-items: baseline; gap: .75rem; margin-bottom: .45rem; }
.detailed-period-heading h3 { margin: 0; font-size: 1rem; }
.detailed-period-heading span { color: var(--muted); font-size: .86rem; text-align: right; }
.detailed-period p { margin: 0; line-height: 1.55; }

.earthquake-controls {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr)) auto;
  gap: .75rem;
  align-items: end;
  margin-bottom: .75rem;
}
.earthquake-controls label { display: grid; gap: .35rem; font-size: .84rem; font-weight: 750; }
.earthquake-controls select {
  width: 100%;
  min-height: 48px;
  padding: .65rem .75rem;
  border-radius: 10px;
}
.earthquake-map {
  width: 100%;
  height: 410px;
  min-height: 280px;
  margin-top: .75rem;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #0c1b29;
  z-index: 0;
}
.earthquake-list { display: grid; gap: .7rem; margin-top: .9rem; }
.earthquake-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: .8rem;
  padding: .85rem;
  border-radius: 12px;
  cursor: pointer;
  transition: border-color .15s ease, box-shadow .15s ease, transform .15s ease;
}
.earthquake-item:hover { transform: translateY(-1px); }
.earthquake-item.selected { border-color: #66c8ff; box-shadow: 0 0 0 3px rgba(102,200,255,.22); }
.earthquake-mag {
  min-width: 3.5rem;
  align-self: start;
  padding: .55rem .4rem;
  border-radius: 10px;
  background: var(--surface-alt);
  font-size: 1.05rem;
  font-weight: 850;
  text-align: center;
}
.earthquake-item h3 { margin: 0 0 .2rem; font-size: .98rem; }
.earthquake-item p { margin: .2rem 0; }
.earthquake-meta, .earthquake-details, .earthquake-note { color: var(--muted); font-size: .8rem; }
.earthquake-details { display: flex; flex-wrap: wrap; gap: .35rem .85rem; }
.earthquake-summary { margin: .75rem 0; padding: .9rem; border-radius: 14px; }
.earthquake-summary:empty { display: none; }
.earthquake-summary-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .65rem; }
.earthquake-summary-grid p { display: grid; gap: .2rem; margin: 0; padding: .65rem; border-radius: 10px; background: rgba(255,255,255,.035); }
.earthquake-summary-grid strong { font-size: .76rem; color: var(--muted); text-transform: uppercase; }
.earthquake-summary-grid span { font-weight: 800; }
.earthquake-item.severity-minor { border-left: 6px solid #35e57a; }
.earthquake-item.severity-moderate { border-left: 6px solid #f9c23c; }
.earthquake-item.severity-strong { border-left: 6px solid #ff8a37; }
.earthquake-item.severity-major { border-left: 6px solid #ff4f5e; }

.welcome-panel {
  margin-top: 1.5rem;
  display: grid;
  grid-template-columns: minmax(260px, .9fr) minmax(0, 1.1fr);
  align-items: center;
  gap: clamp(1rem, 4vw, 3rem);
  padding: clamp(1.25rem, 3vw, 2rem);
}
.welcome-panel img { width: 100%; display: block; border-radius: 14px; }
.welcome-panel p:last-child { margin-bottom: 0; color: var(--muted); line-height: 1.6; }

.site-footer {
  padding: 1.5rem 0 3rem;
  color: var(--muted);
  font-size: .86rem;
  text-align: center;
}
.site-footer img { width: min(520px, 82vw); display: block; margin: 0 auto 1rem; border-radius: 8px; }
.site-footer p { margin-bottom: .45rem; }

.leaflet-container { font-family: inherit; }
.leaflet-popup-content-wrapper,
.leaflet-popup-tip { color: #172737; background: #f7fbff; }
.leaflet-container a { color: #056f9f; }

@media (max-width: 900px) {
  .header-inner { grid-template-columns: 1fr auto; }
  .brand-lockup { grid-column: 1 / -1; }
  .brand-lockup img { width: min(430px, 76vw); margin: 0 auto; }
  .dashboard-grid { grid-template-columns: 1fr; }
  .welcome-panel { grid-template-columns: 1fr; text-align: center; }
  .welcome-panel img { width: min(720px, 100%); margin: auto; }
}
@media (max-width: 780px) {
  .panel-heading, .location-heading { align-items: flex-start; }
  .search-row { grid-template-columns: 1fr; }
  .earthquake-controls { grid-template-columns: 1fr 1fr; }
  .earthquake-summary-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .site-header { padding-bottom: 3.5rem; }
  .header-inner { grid-template-columns: 1fr; text-align: center; }
  .header-unit { width: 100%; }
  .page-shell { width: min(100% - 1rem, 1180px); padding-top: 1rem; }
  .search-panel { margin-top: -2.4rem; padding: 1rem; border-radius: 15px; }
  .panel-heading, .location-heading { flex-direction: column; width: 100%; }
  .system-badge { align-self: flex-start; }
  .card, .alerts-section { padding: 1rem; border-radius: 15px; }
  .location-heading .secondary-button, .search-row button { width: 100%; }
  .current-main { align-items: flex-start; }
  .current-icon { width: 72px; height: 72px; }
  .hourly-scroll { margin-inline: -1rem; padding-inline: 1rem; grid-auto-columns: minmax(112px, 42vw); }
  .daily-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .55rem; }
  .day-card { padding: .75rem .55rem; }
  .day-card img { width: 54px; height: 54px; }
  .earthquake-map { height: 340px; }
  .site-footer { width: calc(100% - 2rem); padding-bottom: calc(2rem + env(safe-area-inset-bottom)); }
}
@media (max-width: 480px) {
  .metrics-grid { grid-template-columns: 1fr 1fr; }
  .earthquake-controls { grid-template-columns: 1fr; }
  .earthquake-item { grid-template-columns: 1fr; }
  .earthquake-mag { width: fit-content; }
  .detailed-period-heading { display: block; }
  .detailed-period-heading span { display: block; margin-top: .2rem; text-align: left; }
}
@media (max-width: 420px) {
  .earthquake-summary-grid { grid-template-columns: 1fr; }
  .collapsible-section > summary { font-size: 1.06rem; }
  .summary-hint { font-size: .68rem; }
}
@media (display-mode: standalone) {
  body { user-select: none; }
  input, p, h1, h2, h3 { user-select: text; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}


/* =========================================================
   Sentinel Arc Environmental v1.1 branding refinements
   ========================================================= */

.product-family {
  margin: 0 0 .28rem;
  color: var(--accent);
  font-size: .82rem;
  font-weight: 900;
  letter-spacing: .32em;
  text-transform: uppercase;
}

.product-subtitle {
  margin: .25rem 0 .55rem;
  color: #dff5ff;
  font-size: clamp(1rem, 2vw, 1.18rem);
  font-weight: 750;
  letter-spacing: .035em;
}

.weather-heading h1 {
  margin-bottom: 0;
  background: linear-gradient(180deg, #ffffff 0%, #dbe7f2 48%, #8fa1b4 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.brand-lockup img,
.site-footer img {
  background: transparent;
  box-shadow: none;
}

.search-panel,
.card,
.welcome-panel,
.alerts-section {
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.search-panel::before,
.card::before,
.welcome-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(55,186,255,.05), transparent 38%);
}

.search-panel,
.card,
.welcome-panel {
  position: relative;
  isolation: isolate;
}

.search-panel > *,
.card > *,
.welcome-panel > * {
  position: relative;
  z-index: 1;
}

.hero-art,
.welcome-panel img {
  object-position: center;
}

@media (max-width: 900px) {
  .weather-heading {
    text-align: center;
  }

  .product-family {
    letter-spacing: .26em;
  }
}