:root {
  color-scheme: dark;
  --font-sans: Inter, ui-sans-serif, system-ui, sans-serif;
  --font-display: "Segoe UI", ui-sans-serif, system-ui, sans-serif;
  --bg: #07111f;
  --bg-elevated: #0c1727;
  --surface: rgba(10, 18, 32, 0.86);
  --surface-strong: rgba(14, 24, 42, 0.98);
  --surface-soft: rgba(255, 255, 255, 0.04);
  --line: rgba(120, 190, 255, 0.18);
  --line-strong: rgba(120, 190, 255, 0.28);
  --text: #e8f1ff;
  --muted: #92a8c6;
  --accent: #35c8ff;
  --accent-2: #43f0c2;
  --accent-3: #ffd36a;
  --danger: #ff7e7e;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.32);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 12px;
  --container: min(1200px, calc(100% - 32px));
}

:root[data-theme='light'] {
  color-scheme: light;
  --bg: #edf4fb;
  --bg-elevated: #ffffff;
  --surface: rgba(255, 255, 255, 0.9);
  --surface-strong: rgba(255, 255, 255, 0.98);
  --surface-soft: rgba(8, 24, 48, 0.04);
  --line: rgba(18, 52, 84, 0.12);
  --line-strong: rgba(18, 52, 84, 0.18);
  --text: #10253d;
  --muted: #51647f;
  --accent: #006d9f;
  --accent-2: #137d62;
  --accent-3: #a56b00;
  --danger: #c73d3d;
  --shadow: 0 20px 50px rgba(20, 48, 80, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  color: var(--text);
  background:
    radial-gradient(circle at top left, color-mix(in srgb, var(--accent) 16%, transparent), transparent 35%),
    radial-gradient(circle at top right, color-mix(in srgb, var(--accent-2) 12%, transparent), transparent 30%),
    linear-gradient(180deg, color-mix(in srgb, var(--bg) 88%, #000 12%) 0%, var(--bg) 100%);
}

body.theme-animating, body.theme-animating * { transition: background-color .25s ease, color .25s ease, border-color .25s ease, box-shadow .25s ease; }

a { color: inherit; }

.topbar, .shell, .admin-topbar, .admin-shell {
  width: var(--container);
  margin: 0 auto;
}

.topbar, .admin-topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
  backdrop-filter: blur(18px);
}

.topbar::before, .admin-topbar::before {
  content: "";
  position: absolute;
  inset: 0;
  background: color-mix(in srgb, var(--bg-elevated) 82%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 90%, transparent);
  border-radius: 0 0 24px 24px;
  z-index: -1;
  box-shadow: var(--shadow);
}

.admin-shell {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}

.admin-sidebar {
  position: sticky;
  top: 96px;
  display: grid;
  gap: 8px;
  padding: 18px;
  height: fit-content;
}

.admin-sidebar a {
  display: flex;
  align-items: center;
  min-height: 46px;
  padding: 10px 14px;
  border-radius: 14px;
  border: 1px solid transparent;
  color: var(--muted);
  transition: background .18s ease, border-color .18s ease, color .18s ease, transform .18s ease;
}

.admin-sidebar a:hover {
  color: var(--text);
  background: var(--surface-soft);
  border-color: var(--line);
  transform: translateX(2px);
}

.admin-sidebar a.active {
  color: var(--text);
  background: color-mix(in srgb, var(--accent) 15%, transparent);
  border-color: color-mix(in srgb, var(--accent) 26%, transparent);
}

.admin-content {
  min-width: 0;
}

.dashboard {
  padding: 24px;
}

.brand {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  white-space: nowrap;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: center;
}

.nav a,
.locale-switcher a,
.theme-toggle,
.admin-sidebar a {
  text-decoration: none;
  color: var(--text);
}

.nav a,
.locale-switcher a,
.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid transparent;
  background: transparent;
  transition: transform .18s ease, background .18s ease, border-color .18s ease, color .18s ease;
  opacity: 0.9;
}

.theme-toggle {
  width: auto;
  white-space: nowrap;
  justify-content: center;
  min-width: 118px;
}

.theme-toggle-label {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.theme-toggle strong {
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.nav a:hover,
.locale-switcher a:hover,
.theme-toggle:hover {
  transform: translateY(-1px);
  border-color: var(--line-strong);
  background: var(--surface-soft);
  opacity: 1;
}

.nav a.is-active,
.locale-switcher a.is-active,
.theme-toggle.is-active {
  background: color-mix(in srgb, var(--accent) 16%, transparent);
  color: var(--text);
  border-color: color-mix(in srgb, var(--accent) 36%, transparent);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.shell, .admin-content {
  padding: 28px 0 72px;
}

.page-intro,
.card,
.stat-card,
.hero-slide,
.auth-card,
.panel,
.content-page,
.admin-sidebar,
.dashboard,
.alert {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.card, .panel, .auth-card, .content-page { padding: 22px; }

.grid-2, .stats-grid, .contact-grid, .admin-card-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.hero-slider {
  padding: 16px 0 10px;
}

.hero-slide {
  padding: clamp(28px, 5vw, 48px);
  min-height: 280px;
  display: none;
  align-content: center;
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.hero-slide::after {
  content: "";
  position: absolute;
  inset: auto -10% -35% auto;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent) 34%, transparent), transparent 65%);
  filter: blur(4px);
  z-index: -1;
}

.hero-slide.is-active { display: grid; }

.hero-slide h1 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 4.4rem);
  line-height: 0.96;
  letter-spacing: -0.04em;
}

.hero-slide p,
.muted,
.card p,
.content-page p {
  color: var(--muted);
}

.badge,
.status-pill,
.pill,
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  padding: 7px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface-soft);
  color: var(--accent);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.status-ok { color: var(--accent-2); }
.status-offline, .text-warning { color: var(--accent-3); }
.text-danger { color: var(--danger); }

.widget-meta { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-bottom: 16px; color: var(--muted); }
.solar-widget, .logbook-stats, .qso-list, .timeline, .stack { display: grid; gap: 12px; }

.solar-row,
.logbook-stat,
.qso-item,
.list-item,
.timeline-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  background: var(--surface-soft);
  border: 1px solid var(--line);
}

.logbook-stat { display: grid; grid-template-columns: 90px 1fr auto; }

.bar {
  height: 10px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--text) 8%, transparent);
  overflow: hidden;
}

.bar i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
}

th, td {
  text-align: left;
  padding: 14px 12px;
  border-bottom: 1px solid var(--line);
}

th {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

input, textarea, select, button {
  width: 100%;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg-elevated) 78%, transparent);
  color: var(--text);
  padding: 12px 14px;
  margin-bottom: 12px;
  font: inherit;
}

input:focus,
textarea:focus,
select:focus,
button:focus,
.theme-toggle:focus,
.nav a:focus,
.locale-switcher a:focus,
a:focus {
  outline: 2px solid color-mix(in srgb, var(--accent) 60%, transparent);
  outline-offset: 2px;
}

textarea { min-height: 140px; resize: vertical; }

button,
.button,
.btn {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #04111c;
  font-weight: 800;
  cursor: pointer;
  border: none;
}

button:hover,
.button:hover,
.btn:hover {
  transform: translateY(-1px);
}

.button-secondary,
.btn-secondary {
  background: var(--surface-soft);
  color: var(--text);
  border: 1px solid var(--line);
}

.button-danger,
.btn-danger {
  background: linear-gradient(135deg, #ff8c8c, #ff5a5a);
  color: #2c0f0f;
}

.stat-card { padding: 18px; display: flex; flex-direction: column; gap: 8px; }
.stat-card strong { font-size: 2rem; color: var(--accent-3); }
.auth-card { max-width: 520px; margin: 40px auto; }
.contact-grid { align-items: start; }
.alert { padding: 12px 14px; margin-bottom: 12px; }
.alert-success { background: color-mix(in srgb, var(--accent-2) 14%, transparent); color: var(--accent-2); }
.alert-error { background: color-mix(in srgb, var(--danger) 14%, transparent); color: var(--danger); }

.page-frame,
.dashboard,
.admin-panel {
  padding: 24px;
}

.hero-grid {
  display: grid;
  gap: 24px;
}

.site-footer {
  width: var(--container);
  margin: 0 auto;
  padding: 24px 0 40px;
  color: var(--muted);
}

.theme-toggle {
  min-width: 118px;
  justify-content: center;
  width: auto;
}

.topbar > * { position: relative; z-index: 1; }

@media (max-width: 980px) {
  .topbar, .admin-topbar {
    flex-wrap: wrap;
    justify-content: center;
    text-align: center;
  }

  .nav { justify-content: center; }

  .admin-shell {
    grid-template-columns: 1fr;
  }

  .admin-sidebar {
    position: relative;
    top: 0;
  }

  .logbook-stat { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .topbar, .shell, .admin-topbar, .admin-shell, .site-footer { width: min(100%, calc(100% - 20px)); }

  .card, .panel, .auth-card, .content-page, .dashboard { padding: 18px; border-radius: 18px; }

  .hero-slide { min-height: 220px; }

  .nav, .topbar-actions { width: 100%; }

  .nav a, .locale-switcher a, .theme-toggle { flex: 1 1 auto; justify-content: center; }
}