:root {
  /* Palette - Warm, Natural, Premium */
  --color-bg: #FDFCF8;
  --color-bg-secondary: #F7F3EB;
  --color-primary: #B08968; /* Earthy Brown/Bronze */
  --color-primary-dark: #7F5539;
  --color-accent: #606C38; /* Muted Olive Green */
  --color-text-main: #3D342B;
  --color-text-muted: #6D6875;
  --color-white: #FFFFFF;
  --color-border: #E6DBC9;
  --color-success: #606C38;
  --color-error: #BC4749;

  /* Typography */
  --font-heading: 'Playfair Display', serif;
  --font-body: 'Inter', sans-serif;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 8rem;

  /* Shadows */
  --shadow-soft: 0 10px 30px -10px rgba(61, 52, 43, 0.05);
  --shadow-card: 0 4px 20px rgba(61, 52, 43, 0.08);
  --shadow-hover: 0 20px 40px -10px rgba(61, 52, 43, 0.15);

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--color-text-main);
  line-height: 1.2;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition-fast);
}

ul {
  list-style: none;
}

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

/* Utilities */
.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: var(--transition-smooth);
  gap: 0.5rem;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-soft);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.btn-secondary {
  background-color: var(--color-white);
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn-secondary:hover {
  background-color: var(--color-bg-secondary);
  transform: translateY(-2px);
}

.btn-block {
  width: 100%;
}

.card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
}

/* Inputs */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--color-text-muted);
}

.form-input {
  width: 100%;
  padding: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 1rem;
  transition: var(--transition-fast);
  background-color: var(--color-bg);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  background-color: var(--color-white);
  box-shadow: 0 0 0 3px rgba(176, 137, 104, 0.1);
}

.input-group {
  position: relative;
}

.input-suffix {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* Auth / Modal Styles */
.auth-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-secondary);
  padding: 1rem;
}

.auth-card {
  width: 100%;
  max-width: 400px;
}

/* Landing Page Specifics */
.hero {
  padding: var(--spacing-xl) 0;
  text-align: center;
  background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
}

.hero-title {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary-dark);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto var(--spacing-md);
}

.benefits {
  padding: var(--spacing-lg) 0;
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-top: var(--spacing-md);
}

.benefit-item {
  text-align: center;
  padding: 1.5rem;
}

.benefit-icon {
  font-size: 2.5rem;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

/* Calculator App Styles */
.app-layout {
  min-height: 100vh;
  background-color: var(--color-bg-secondary);
}

.app-header {
  background: var(--color-white);
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
}

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

.calculator-grid {
  display: grid;
  grid-template-columns: 1fr 350px;
  gap: 2rem;
  padding: 2rem 0;
}

@media (max-width: 768px) {
  .calculator-grid {
    grid-template-columns: 1fr;
  }
}

.result-card {
  position: sticky;
  top: 2rem;
  background: var(--color-primary-dark);
  color: var(--color-white);
  border: none;
}

.result-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.result-row:last-child {
  border-bottom: none;
}

.result-label {
  opacity: 0.8;
  font-size: 0.9rem;
}

.result-value {
  font-weight: 700;
  font-size: 1.25rem;
}

.result-total {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255,255,255,0.2);
}

.result-total .result-value {
  font-size: 2rem;
  color: #FFE6A7;
}

.locked-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(5px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  text-align: center;
}

.skeleton {
  background-color: #E0E0E0;
  color: transparent;
  border-radius: 4px;
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0% { opacity: 0.6; }
  50% { opacity: 0.8; }
  100% { opacity: 0.6; }
}

/* Animations */
.fade-in {
  animation: fadeIn 0.5s ease-out forwards;
}

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