/* ── Classic (current flat system) ── */
:root,
[data-theme="classic"] {
  --bg: #f5f5f5;
  --surface: #ffffff;
  --border: #e0e0e0;
  --text: #212121;
  --text-muted: #757575;
  --muted: #757575;
  --accent: #1976d2;
  --accent-hover: #1565c0;
  --accent-soft: #e3f2fd;
  --accent-gradient: linear-gradient(135deg, #1976d2, #1976d2);
  --success: #2e7d32;
  --warning: #ed6c02;
  --error: #c62828;
  --radius: 8px;
  --shadow: none;
  --shadow-md: none;
  --shadow-lg: none;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --card-top-border: transparent;
  --body-gradient: var(--bg);
  --input-focus-ring: rgba(25, 118, 210, 0.15);
  --table-head-bg: var(--bg);
  --chart-surface: #ffffff;
  --chart-grid: #eeeeee;
  --chart-tick: #757575;
  --chart-c1: #1976d2;
  --chart-c2: #2e7d32;
  --chart-c3: #ed6c02;
  --chart-c4: #7b1fa2;
  --chart-c5: #00838f;
  --chart-c6: #c62828;
  --chart-fill-alpha: 0.08;
}

/* ── Medium (vivid, polished) ── */
[data-theme="medium"] {
  --bg: #e8edf8;
  --surface: #ffffff;
  --border: #c7d5f0;
  --text: #0f172a;
  --text-muted: #475569;
  --muted: #475569;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-soft: #eef2ff;
  --accent-gradient: linear-gradient(135deg, #4f46e5 0%, #0ea5e9 55%, #14b8a6 100%);
  --success: #059669;
  --warning: #d97706;
  --error: #dc2626;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px rgba(79, 70, 229, 0.1), 0 2px 8px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 20px 40px rgba(79, 70, 229, 0.14), 0 4px 12px rgba(15, 23, 42, 0.08);
  --font-sans: 'Plus Jakarta Sans', 'Inter', system-ui, sans-serif;
  --card-top-border: linear-gradient(90deg, #4f46e5, #0ea5e9, #14b8a6);
  --body-gradient: linear-gradient(145deg, #eef2ff 0%, #f0f9ff 40%, #ecfeff 100%);
  --input-focus-ring: rgba(79, 70, 229, 0.2);
  --table-head-bg: #f1f5ff;
  --chart-surface: #ffffff;
  --chart-grid: #e2e8f0;
  --chart-tick: #64748b;
  --chart-c1: #4f46e5;
  --chart-c2: #0ea5e9;
  --chart-c3: #14b8a6;
  --chart-c4: #8b5cf6;
  --chart-c5: #f59e0b;
  --chart-c6: #ec4899;
  --chart-fill-alpha: 0.12;
}

/* ── Space (cosmic dark) ── */
[data-theme="space"] {
  --bg: #070b14;
  --surface: #121a2e;
  --border: #2a3655;
  --text: #e8edf5;
  --text-muted: #94a3b8;
  --muted: #94a3b8;
  --accent: #818cf8;
  --accent-hover: #a5b4fc;
  --accent-soft: #1e293b;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #22d3ee 50%, #c084fc 100%);
  --success: #34d399;
  --warning: #fbbf24;
  --error: #f87171;
  --radius: 12px;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 32px rgba(99, 102, 241, 0.15), 0 4px 16px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 48px rgba(99, 102, 241, 0.2), 0 8px 24px rgba(0, 0, 0, 0.45);
  --font-sans: 'Plus Jakarta Sans', 'Inter', system-ui, sans-serif;
  --card-top-border: linear-gradient(90deg, #6366f1, #22d3ee, #c084fc);
  --body-gradient: radial-gradient(ellipse at 20% 0%, #1e1b4b 0%, transparent 50%),
    radial-gradient(ellipse at 80% 100%, #0c4a6e 0%, transparent 45%),
    linear-gradient(180deg, #070b14 0%, #0f172a 100%);
  --input-focus-ring: rgba(129, 140, 248, 0.35);
  --table-head-bg: #1a2238;
  --chart-surface: #161f35;
  --chart-grid: #334155;
  --chart-tick: #94a3b8;
  --chart-c1: #38bdf8;
  --chart-c2: #a78bfa;
  --chart-c3: #34d399;
  --chart-c4: #f472b6;
  --chart-c5: #fbbf24;
  --chart-c6: #22d3ee;
  --chart-fill-alpha: 0.18;
}

[data-theme="classic"] body { background: var(--bg); }

[data-theme="medium"] body,
[data-theme="space"] body {
  background: var(--body-gradient);
  background-attachment: fixed;
  font-family: var(--font-sans);
}

/* Login hero — always white behind photo */
.hero {
  background: #ffffff !important;
}

[data-theme="medium"] h1,
[data-theme="space"] h1 {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

[data-theme="medium"] .nav h1,
[data-theme="space"] .nav h1 {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

[data-theme="medium"] .login-card h1,
[data-theme="space"] .login-card h1 {
  background: none;
  -webkit-background-clip: unset;
  background-clip: unset;
  color: var(--text);
}

[data-theme="medium"] .card,
[data-theme="medium"] .summary-box,
[data-theme="medium"] .controls,
[data-theme="medium"] .chart-container,
[data-theme="space"] .card,
[data-theme="space"] .summary-box,
[data-theme="space"] .controls,
[data-theme="space"] .chart-container {
  box-shadow: var(--shadow-md);
  border-color: var(--border);
  position: relative;
  overflow: hidden;
}

[data-theme="medium"] .card::before,
[data-theme="medium"] .summary-box::before,
[data-theme="medium"] .controls::before,
[data-theme="medium"] .chart-container::before,
[data-theme="space"] .card::before,
[data-theme="space"] .summary-box::before,
[data-theme="space"] .controls::before,
[data-theme="space"] .chart-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--card-top-border);
}

[data-theme="medium"] .layout,
[data-theme="space"] .layout {
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  border-radius: 16px;
}

[data-theme="medium"] button,
[data-theme="medium"] #saveMetadataBtn,
[data-theme="medium"] #chartViewToggle.active,
[data-theme="space"] button,
[data-theme="space"] #saveMetadataBtn,
[data-theme="space"] #chartViewToggle.active {
  background: var(--accent-gradient);
  border: none;
  color: #fff;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
}

[data-theme="space"] button,
[data-theme="space"] #saveMetadataBtn,
[data-theme="space"] #chartViewToggle.active {
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.45);
}

[data-theme="medium"] button:hover,
[data-theme="medium"] #saveMetadataBtn:hover,
[data-theme="space"] button:hover,
[data-theme="space"] #saveMetadataBtn:hover {
  filter: brightness(1.06);
  transform: translateY(-1px);
}

[data-theme="medium"] button.danger,
[data-theme="space"] button.danger {
  background: linear-gradient(135deg, #dc2626, #b91c1c);
}

[data-theme="medium"] #chartViewToggle,
[data-theme="space"] #chartViewToggle {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--accent);
  box-shadow: var(--shadow);
}

[data-theme="medium"] input,
[data-theme="medium"] select,
[data-theme="medium"] textarea,
[data-theme="space"] input,
[data-theme="space"] select,
[data-theme="space"] textarea {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border);
}

[data-theme="space"] .info-readonly {
  background: #1a2238;
}

[data-theme="medium"] .relay-events-table thead th,
[data-theme="medium"] .summary-table thead th,
[data-theme="medium"] th,
[data-theme="space"] .relay-events-table thead th,
[data-theme="space"] .summary-table thead th,
[data-theme="space"] th {
  background: var(--table-head-bg);
}

[data-theme="medium"] .chart-view-bar,
[data-theme="space"] .chart-view-bar {
  padding: 0.75rem 1rem;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
}

[data-theme="space"] .op-type {
  background: #1e293b;
  color: var(--accent);
  border: 1px solid var(--border);
}

[data-theme="space"] .state-on { color: var(--success); }
[data-theme="space"] .state-off { color: var(--text-muted); }

/* Admin theme dropdown row */
.theme-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.theme-row label {
  margin: 0;
  font-size: 0.9rem;
}

.theme-row select {
  max-width: 180px;
  margin: 0;
  padding: 0.5rem 0.75rem;
}

.theme-row button {
  margin: 0;
}