/* ---------------------------------------------------
   Global Theme
--------------------------------------------------- */
:root {
  --bg: #0f1724;
  --text: #ffffff;
  --card: #1a2537;
  --card-light: #f3f4f6;
  --accent: #4caf50;
  --yellow: #fff7cd;
  --muted: #94a3b8;
  --danger: #cc3333;
}

body {
  margin: 0;
  font-family: system-ui, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.app-container {
  padding-bottom: 80px;
  max-width: 900px;
  margin: auto;
}

/* ---------------------------------------------------
   Headers / Titles
--------------------------------------------------- */

.app-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  background: #08101f;
  border-bottom: 1px solid #142034;
}

.app-header .logo {
  width: 42px;
  height: 42px;
  border-radius: 8px;
}

.section-title {
  margin: 18px 0 10px 12px;
  font-size: 22px;
  font-weight: 700;
}

/* ---------------------------------------------------
   Cards
--------------------------------------------------- */

.card {
  background: var(--card);
  padding: 14px;
  margin: 12px;
  border-radius: 12px;
}

.card.light {
  background: var(--card-light);
  color: #000;
}

.card h3 {
  margin-top: 0;
  font-size: 18px;
}

label {
  font-size: 14px;
  margin-top: 8px;
  display: block;
  color: var(--muted);
}

/* Inputs */
input, select {
  width: 100%;
  padding: 10px;
  border-radius: 8px;
  border: none;
  margin-top: 4px;
  background: #ffffff;
  font-size: 15px;
}

.card.light input {
  background: var(--yellow);
}

/* ---------------------------------------------------
   Buttons
--------------------------------------------------- */

.primary-btn {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 12px;
  border-radius: 10px;
  font-weight: 700;
  cursor: pointer;
  margin-top: 12px;
}

.secondary-btn {
  background: #ffffff20;
  color: #fff;
  border: none;
  padding: 12px;
  border-radius: 10px;
  font-weight: 700;
  cursor: pointer;
  margin-top: 10px;
}

.danger-btn {
  background: var(--danger);
  color: #fff;
  padding: 12px;
  border-radius: 10px;
  font-weight: 700;
  margin-top: 12px;
  border: none;
}

.full { width: 100%; }

/* ---------------------------------------------------
   Stats Grid
--------------------------------------------------- */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  padding: 0 12px;
}

.stat-card {
  background: var(--card);
  padding: 10px;
  border-radius: 12px;
  text-align: center;
}

.stat-label {
  font-size: 14px;
  color: var(--muted);
}

.stat-value {
  font-size: 22px;
  font-weight: 700;
  margin-top: 6px;
  color: var(--accent);
}

/* ---------------------------------------------------
   Parts List
--------------------------------------------------- */

.part-card {
  background: var(--card);
  padding: 14px;
  border-radius: 12px;
  margin: 12px;
}

.part-name {
  font-size: 18px;
  font-weight: 700;
}

.part-meta {
  font-size: 14px;
  color: var(--muted);
}

.part-actions {
  margin-top: 12px;
  display: flex;
  gap: 10px;
}

.part-actions button {
  padding: 8px 12px;
  background: #fff;
  border-radius: 8px;
  border: none;
  cursor: pointer;
}

/* ---------------------------------------------------
   AC Calculator
--------------------------------------------------- */

.result-card {
  background: #dff7df;
  color: #000;
  margin: 12px;
  padding: 16px;
  border-radius: 12px;
  border-left: 6px solid var(--accent);
  font-size: 16px;
}

.result-card h3 {
  margin-top: 0;
}

.result-card span {
  font-weight: 800;
  color: #0a4f0a;
}

/* ---------------------------------------------------
   Screens
--------------------------------------------------- */

.screen { display: none; }
.screen.active { display: block; }

/* ---------------------------------------------------
   Bottom Navigation
--------------------------------------------------- */

.bottom-nav {
  position: fixed;
  bottom: 0;
  width: 100%;
  max-width: 900px;
  left: 50%;
  transform: translateX(-50%);
  background: #08101f;
  display: flex;
  justify-content: space-around;
  padding: 8px 0;
  border-top: 1px solid #142034;
}

.nav-btn {
  background: none;
  border: none;
  color: #ffffff80;
  font-size: 14px;
  padding: 6px;
  cursor: pointer;
  text-align: center;
}

.nav-btn.active {
  color: var(--accent);
  font-weight: 700;
}

/* Icons above text */
.nav-btn br {
  line-height: 0;
}

/* ---------------------------------------------------
   Utility
--------------------------------------------------- */

.hidden { display: none; }