/* ===========================================
   base.css — Reset, variabili CSS, tipografia
   Mobile-first 360x800
   =========================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--text);
  transition: background-color 0.2s, color 0.2s;
}

input, button, textarea, select {
  font: inherit;
  color: inherit;
}

/* --- Variabili tema dark (default) --- */
:root,
:root[data-theme="dark"] {
  --bg: #0f0f1e;
  --bg-elevated: #1a1a2e;
  --bg-card: #16213e;
  --text: #e8e8e8;
  --text-muted: #a0a0b0;
  --text-dim: #6c6c7c;
  --primary: #16c79a;
  --primary-hover: #14b389;
  --primary-text: #0f0f1e;
  --danger: #e94560;
  --warning: #f5a623;
  --border: #2a2a4e;
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  --radius: 12px;
  --radius-sm: 8px;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.75rem;
  --font-size-xxl: 2.25rem;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 3rem;
}

/* --- Variabili tema light --- */
:root[data-theme="light"] {
  --bg: #f8f9fa;
  --bg-elevated: #ffffff;
  --bg-card: #ffffff;
  --text: #1a1a2e;
  --text-muted: #6c6c7c;
  --text-dim: #a0a0b0;
  --primary: #16c79a;
  --primary-hover: #14b389;
  --primary-text: #ffffff;
  --danger: #dc3545;
  --warning: #f5a623;
  --border: #e0e0e8;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

/* --- Layout principale --- */
body {
  display: flex;
  flex-direction: column;
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-md);
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.app-logo {
  font-size: var(--font-size-md);
  font-weight: 600;
  color: var(--primary);
  letter-spacing: -0.01em;
}

.app-status {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.app-main {
  flex: 1;
  padding: var(--spacing-md);
  max-width: 100%;
  overflow-x: hidden;
}

/* --- Loading --- */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  color: var(--text-muted);
  font-size: var(--font-size-sm);
}

/* --- Tipografia --- */
h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

h1 { font-size: var(--font-size-xl); }
h2 { font-size: var(--font-size-lg); }
h3 { font-size: var(--font-size-md); }

p { margin-bottom: var(--spacing-md); }

a {
  color: var(--primary);
  text-decoration: none;
}

a:active { opacity: 0.7; }

.text-muted { color: var(--text-muted); }
.text-dim { color: var(--text-dim); }
.text-small { font-size: var(--font-size-sm); }
.text-center { text-align: center; }

/* --- Status connessione --- */
.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
  transition: background-color 0.2s;
}
.status-offline { background: var(--danger); }
.status-online { background: var(--primary); box-shadow: 0 0 8px var(--primary); }
.status-connecting { background: var(--warning); animation: pulse 1s infinite; }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* --- Icon buttons (header) --- */
.icon-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 1.1rem;
  cursor: pointer;
  transition: background-color 0.15s, transform 0.1s;
  min-width: 38px;
  min-height: 38px;
}

.icon-btn:active {
  transform: scale(0.92);
  background: var(--bg-card);
}

.icon-btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}