@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  /* Color Palette */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent-primary: #3b82f6; /* Blue for water / main */
  --accent-secondary: #8b5cf6; /* Purple for aesthetic */
  --accent-success: #10b981; /* Green for macros */
  --accent-warning: #f59e0b; /* Orange */
  --accent-danger: #ef4444; /* Red */
  
  --macro-protein: #8b5cf6;
  --macro-fat: #f59e0b;
  --macro-carbs: #10b981;
  --water-color: #3b82f6;

  --border-color: rgba(255, 255, 255, 0.1);
  --glass-bg: rgba(30, 41, 59, 0.7);
  --glass-border: rgba(255, 255, 255, 0.05);

  --font-family: 'Inter', sans-serif;
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

#root {
  width: 100%;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  background-color: var(--bg-primary);
  box-shadow: none;
  overflow-x: hidden;
}

@media (min-width: 768px) {
  #root {
    flex-direction: row;
  }
}

/* Utilities */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.text-gradient {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Form Elements */
input, select, button {
  font-family: inherit;
  font-size: 16px;
}

.input-field {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  transition: border-color 0.3s;
}

.input-field:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.btn-primary {
  width: 100%;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  border: none;
  padding: 14px 20px;
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-secondary {
  width: 100%;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: none;
  padding: 14px 20px;
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-secondary:hover {
  background: var(--bg-secondary);
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
  animation: fadeIn 0.5s ease forwards;
}

/* Page Container */
.page-container {
  padding: 24px;
  padding-bottom: 90px; /* Space for bottom nav on mobile */
  flex: 1;
  overflow-y: auto;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .page-container {
    padding: 40px;
    padding-left: 120px; /* Space for sidebar */
    padding-bottom: 40px;
  }
}

/* Typography */
h1 { font-size: 28px; font-weight: 700; margin-bottom: 16px; }
h2 { font-size: 22px; font-weight: 600; margin-bottom: 12px; }
h3 { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
p { color: var(--text-secondary); margin-bottom: 12px; }