/* ============================================
   TempTale Cloud — Styles
   Dual theme (dark/light), blue accent
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── Theme Variables ──────────────────────── */

:root {
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 2px 8px rgba(0,0,0,.12);
  --shadow-lg: 0 8px 32px rgba(0,0,0,.2);
  --transition: .2s ease;
  --max-width: 1140px;
}

[data-theme="dark"] {
  --bg-primary: #0b1120;
  --bg-secondary: #111827;
  --bg-card: #1e293b;
  --bg-card-hover: #263348;
  --border: #1e3a5f;
  --border-light: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --accent-glow: rgba(59,130,246,.15);
  --success: #22c55e;
  --success-bg: rgba(34,197,94,.12);
  --warning: #f59e0b;
  --warning-bg: rgba(245,158,11,.12);
  --danger: #ef4444;
  --danger-bg: rgba(239,68,68,.12);
  --code-bg: #0f172a;
  --nav-bg: rgba(11,17,32,.85);
  --chart-bg: #111827;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent: #2563eb;
  --accent-hover: #3b82f6;
  --accent-glow: rgba(37,99,235,.08);
  --success: #16a34a;
  --success-bg: rgba(22,163,74,.08);
  --warning: #d97706;
  --warning-bg: rgba(217,119,6,.08);
  --danger: #dc2626;
  --danger-bg: rgba(220,38,38,.08);
  --code-bg: #f1f5f9;
  --nav-bg: rgba(248,250,252,.9);
  --chart-bg: #ffffff;
}

/* ── Reset & Base ─────────────────────────── */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); }

code, pre { font-family: var(--font-mono); }

img { max-width: 100%; display: block; }

/* ── Navigation ───────────────────────────── */

nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .75rem 1.5rem;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-brand {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}
.nav-brand span { color: var(--accent); }
.nav-brand:hover { color: var(--text-primary); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: .9rem;
  font-weight: 500;
  padding: .25rem 0;
  border-bottom: 2px solid transparent;
  transition: all var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  cursor: pointer;
  padding: .35rem .5rem;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  line-height: 1;
  transition: all var(--transition);
  display: flex;
  align-items: center;
}
.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* ── Buttons ──────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .6rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: .9rem;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-hover);
  color: #fff;
  box-shadow: 0 4px 16px var(--accent-glow);
}

.btn-outline {
  background: transparent;
  border: 1.5px solid var(--accent);
  color: var(--accent);
}
.btn-outline:hover {
  background: var(--accent-glow);
  color: var(--accent-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}
.btn-ghost:hover {
  color: var(--accent);
  background: var(--accent-glow);
}

.btn-sm { padding: .4rem .8rem; font-size: .8rem; }

/* ── Hero Section (Landing) ───────────────── */

.hero {
  text-align: center;
  padding: 5rem 1.5rem 3rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-icon {
  font-size: 3.5rem;
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: .75rem;
}
.hero h1 span { color: var(--accent); }

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 2rem;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ── Features Grid ────────────────────────── */

.features {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.25rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: all var(--transition);
}
.feature-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-glow);
}

.feature-icon {
  font-size: 1.75rem;
  margin-bottom: .75rem;
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: .4rem;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: .88rem;
  line-height: 1.5;
}

/* ── Section / Divider ────────────────────── */

.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.section-header {
  display: flex;
  align-items: center;
  gap: .5rem;
  margin-bottom: 1.5rem;
}
.section-header .hash {
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 700;
}
.section-header h2 {
  font-size: 1.35rem;
  font-weight: 700;
}

.section-divider {
  border: none;
  border-top: 1px solid var(--border);
  max-width: var(--max-width);
  margin: 0 auto;
}

/* ── Dashboard — Device Cards ─────────────── */

.dashboard-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.dashboard-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
}

.devices-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1rem;
}

.device-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  color: inherit;
  display: block;
}
.device-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: inherit;
}

.device-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: .75rem;
}

.device-name {
  font-weight: 600;
  font-size: 1.05rem;
  font-family: var(--font-mono);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  font-size: .78rem;
  font-weight: 500;
  padding: .2rem .6rem;
  border-radius: 999px;
}
.status-badge.online {
  background: var(--success-bg);
  color: var(--success);
}
.status-badge.offline {
  background: var(--danger-bg);
  color: var(--danger);
}
.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  display: inline-block;
}
.status-badge.online .status-dot { background: var(--success); }
.status-badge.offline .status-dot { background: var(--danger); }

.device-card-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .5rem;
  margin-top: .5rem;
}

.device-stat {
  display: flex;
  flex-direction: column;
}
.device-stat-label {
  font-size: .72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .04em;
  font-weight: 500;
}
.device-stat-value {
  font-size: .95rem;
  font-weight: 600;
  font-family: var(--font-mono);
}

/* ── Device Detail ────────────────────────── */

.device-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.device-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  font-family: var(--font-mono);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  color: var(--text-secondary);
  font-size: .88rem;
  margin-bottom: 1rem;
}
.back-link:hover { color: var(--accent); }

/* Current Readings */
.readings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.reading-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  text-align: center;
}

.reading-label {
  font-size: .78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .04em;
  font-weight: 500;
  margin-bottom: .35rem;
}

.reading-value {
  font-size: 2rem;
  font-weight: 700;
  font-family: var(--font-mono);
  line-height: 1.2;
}

.reading-unit {
  font-size: .85rem;
  color: var(--text-muted);
  font-weight: 400;
}

.reading-minmax {
  font-size: .75rem;
  color: var(--text-secondary);
  margin-top: .35rem;
  font-family: var(--font-mono);
}

/* Chart Container */
.chart-section {
  margin-bottom: 2rem;
}

.chart-container {
  background: var(--chart-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  min-height: 350px;
  position: relative;
}

.chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: .75rem;
}

.chart-header h3 {
  font-size: 1rem;
  font-weight: 600;
}

.chart-range-btns {
  display: flex;
  gap: .35rem;
}

.chart-range-btns button {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: .25rem .6rem;
  border-radius: var(--radius-sm);
  font-size: .75rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-body);
}
.chart-range-btns button:hover,
.chart-range-btns button.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* Stats / Info panels */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.info-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.info-panel h3 {
  font-size: .9rem;
  font-weight: 600;
  margin-bottom: .75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: .03em;
}

.info-row {
  display: flex;
  justify-content: space-between;
  padding: .35rem 0;
  border-bottom: 1px solid var(--border-light);
  font-size: .88rem;
}
.info-row:last-child { border-bottom: none; }

.info-row-label { color: var(--text-secondary); }
.info-row-value {
  font-weight: 500;
  font-family: var(--font-mono);
  font-size: .85rem;
}

/* ── About Page ───────────────────────────── */

.about-hero {
  text-align: center;
  padding: 4rem 1.5rem 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
}
.about-hero h1 {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: .5rem;
}
.about-hero p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 540px;
  margin: 0 auto;
}

.about-section {
  max-width: 760px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}
.about-section h2 {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 2rem 0 .75rem;
}
.about-section p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.7;
}

.stack-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 1rem 0 1.5rem;
}
.stack-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  text-align: center;
}
.stack-icon { font-size: 1.75rem; margin-bottom: .5rem; }
.stack-item h3 { font-size: .95rem; font-weight: 600; margin-bottom: .25rem; }
.stack-item p { color: var(--text-secondary); font-size: .82rem; }

/* ── Loading / Empty States ───────────────── */

.loading-state, .empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-muted);
}

.loading-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .8s linear infinite;
  margin: 0 auto 1rem;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ── Footer ───────────────────────────────── */

footer {
  margin-top: 4rem;
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-brand {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-secondary);
  font-size: .88rem;
  margin-bottom: .5rem;
}
.footer-brand span { color: var(--accent); }

.footer-badge {
  color: var(--text-muted);
  font-size: .78rem;
}
.footer-badge span { color: var(--accent); }

/* ── Responsive ───────────────────────────── */

@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  .hero-subtitle { font-size: 1rem; }
  nav { padding: .65rem 1rem; }
  .nav-links { gap: .75rem; }
  .nav-links a { font-size: .82rem; }
  .devices-grid { grid-template-columns: 1fr; }
  .readings-grid { grid-template-columns: repeat(2, 1fr); }
  .info-grid { grid-template-columns: 1fr; }
  .features { grid-template-columns: 1fr; }
  .device-header { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.6rem; }
  .hero { padding: 3rem 1rem 2rem; }
  .nav-links { gap: .5rem; }
  .readings-grid { grid-template-columns: 1fr; }
  .chart-container { padding: .5rem; min-height: 280px; }
  .hero-actions { flex-direction: column; align-items: center; }
}