* { box-sizing: border-box; }

:root {
  --bg-primary: #16213e;
  --bg-secondary: #1a1a2e;
  --bg-tertiary: #0f3460;
  --text-primary: #e8e8e8;
  --text-secondary: #b8c5d6;
  --accent: #d4a843;
  --accent-dim: rgba(212, 168, 67, 0.3);
  --card-bg: rgba(255,255,255,0.95);
  --border: #ccc;
}

[data-theme="oil"] {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-tertiary: #0f3460;
  --text-primary: #e8e8e8;
  --text-secondary: #b8c5d6;
  --accent: #d4a843;
  --accent-dim: rgba(212, 168, 67, 0.3);
}

[data-theme="solar"] {
  --bg-primary: #1a1a0f;
  --bg-secondary: #2d2d1a;
  --bg-tertiary: #3d3d1f;
  --text-primary: #f5f5dc;
  --text-secondary: #c9c9a8;
  --accent: #ffcc00;
  --accent-dim: rgba(255, 204, 0, 0.3);
}

[data-theme="forest"] {
  --bg-primary: #0f1a14;
  --bg-secondary: #1a2e21;
  --bg-tertiary: #1a3d28;
  --text-primary: #e8f0e8;
  --text-secondary: #a8c9a8;
  --accent: #4caf50;
  --accent-dim: rgba(76, 175, 80, 0.3);
}

[data-theme="ocean"] {
  --bg-primary: #0a1628;
  --bg-secondary: #0d2137;
  --bg-tertiary: #15304d;
  --text-primary: #e0f0ff;
  --text-secondary: #a8c8e0;
  --accent: #00b4d8;
  --accent-dim: rgba(0, 180, 216, 0.3);
}

[data-theme="midnight"] {
  --bg-primary: #121212;
  --bg-secondary: #1e1e1e;
  --bg-tertiary: #2a2a2a;
  --text-primary: #ffffff;
  --text-secondary: #b0b0b0;
  --accent: #9b59b6;
  --accent-dim: rgba(155, 89, 182, 0.3);
}

body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: var(--bg-primary);
  min-height: 100vh;
}

.top-nav {
  position: fixed;
  top: 15px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  display: flex;
  gap: 20px;
  background: rgba(0,0,0,0.5);
  padding: 10px 20px;
  border-radius: 25px;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 8px 20px;
  border-radius: 20px;
  transition: all 0.3s;
}

.nav-link:hover { color: var(--accent); }
.nav-link.active { background: var(--accent); color: var(--bg-primary); }

.nav-auth {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}

.theme-selector {
  position: fixed;
  top: 10px;
  right: 10px;
  z-index: 1000;
  display: flex;
  gap: 5px;
}

.theme-btn {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.5);
  cursor: pointer;
  transition: transform 0.2s, border-color 0.2s;
}

.theme-btn:hover { transform: scale(1.2); }
.theme-btn.active { border-color: white; transform: scale(1.2); }
.theme-btn.oil { background: linear-gradient(135deg, #1a1a2e, #d4a843); }
.theme-btn.solar { background: linear-gradient(135deg, #2d2d1a, #ffcc00); }
.theme-btn.forest { background: linear-gradient(135deg, #1a2e21, #4caf50); }
.theme-btn.ocean { background: linear-gradient(135deg, #0d2137, #00b4d8); }
.theme-btn.midnight { background: linear-gradient(135deg, #1e1e1e, #9b59b6); }

button {
  padding: 3px 8px;
  cursor: pointer;
  border-radius: 4px;
  border: 1px solid var(--accent);
  background: var(--bg-primary);
  color: var(--accent);
  font-size: 0.75rem;
  line-height: 14px;
}

button:hover { background: var(--accent); color: var(--bg-primary); }

.loading-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  z-index: 1000;
}

.spinner {
  width: 60px; height: 60px;
  border: 4px solid #d4a843;
  border-top-color: #1a1a2e;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.loading-text { margin-top: 16px; font-size: 1.1rem; color: #d4a843; }

#userInfo { color: var(--text-secondary); font-size: 0.9rem; }
#loginBtn, #logoutBtn { padding: 4px 12px; font-size: 0.85rem; }

.auth-prompt {
  position: relative;
  z-index: 1001;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 80vh;
  text-align: center;
}

.auth-prompt-inner {
  max-width: 500px;
  padding: 40px;
}

.auth-prompt-inner h1 {
  color: var(--accent);
  font-size: 2.5rem;
  margin: 0 0 20px 0;
  letter-spacing: 3px;
}

.auth-prompt-inner .tagline {
  color: var(--text-secondary);
  font-size: 1.2rem;
  margin-bottom: 30px;
}

.auth-prompt-inner p {
  color: var(--text-secondary);
  margin-bottom: 30px;
  line-height: 1.7;
}

.auth-prompt-inner button {
  padding: 12px 40px;
  font-size: 1.1rem;
  border-radius: 25px;
}