/* ========================================
   Heatmap Housing — Design System & Components
   
   Variables live in tokens.css (loaded first).
   This file contains resets, base styles, and
   reusable component classes.
   ======================================== */

/* Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--bg-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--darker);
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: clamp(2rem, 4vw, 2.75rem); /* 32-44px responsive */
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.25rem); /* 28-36px responsive */
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem); /* 20-24px responsive */
}

h4 {
  font-size: 1.25rem; /* 20px */
}

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

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

a:hover {
  color: var(--primary-dark);
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-wide {
  max-width: 1400px;
}

.container-narrow {
  max-width: 900px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 0.875rem 1.75rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-lg);
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--primary);
  color: var(--bg-white);
  border-color: var(--primary);
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-lg);
}

.btn-secondary {
  background: var(--bg-white);
  color: var(--dark);
  border-color: var(--border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-light);
  border-color: var(--dark);
}

.btn-success {
  background: var(--success);
  color: var(--bg-white);
  border-color: var(--success);
}

.btn-success:hover:not(:disabled) {
  background: var(--success-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--success-shadow);
}

.btn-text {
  background: transparent;
  color: var(--text-muted);
  padding: 0.5rem 1rem;
  border: none;
}

.btn-text:hover:not(:disabled) {
  color: var(--dark);
  background: transparent;
}

.btn-lg {
  padding: 1.125rem 2rem;
  font-size: 1.125rem;
}

.btn-sm {
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
}

/* Cards */
.card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: 0 1px 3px var(--shadow);
  transition: var(--transition);
}

.card:hover {
  box-shadow: 0 10px 30px var(--shadow-lg);
  transform: translateY(-4px);
}

.card-header {
  margin-bottom: var(--spacing-lg);
}

.card-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.card-subtitle {
  color: var(--text-muted);
  font-size: 1rem;
}

.card-body {
  margin-bottom: var(--spacing-lg);
}

.card-footer {
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 0.375rem 0.875rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  background: var(--bg-light);
  color: var(--text);
}

.badge-success {
  background: var(--badge-success-bg);
  color: var(--badge-success-text);
}

.badge-primary {
  background: var(--badge-primary-bg);
  color: var(--badge-primary-text);
}

.badge-warning {
  background: var(--badge-warning-bg);
  color: var(--badge-warning-text);
}

/* Feature Grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin: var(--spacing-2xl) 0;
}

.feature-item {
  text-align: center;
  padding: var(--spacing-lg);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  border-radius: var(--radius-xl);
  font-size: 2rem;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.feature-description {
  color: var(--text-muted);
  font-size: 1rem;
}

/* Section Spacing */
section {
  padding: var(--spacing-3xl) 0;
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto var(--spacing-2xl);
}

.section-subtitle {
  color: var(--primary);
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-sm);
}

.section-title {
  margin-bottom: var(--spacing-md);
}

.section-description {
  font-size: 1.125rem;
  color: var(--text-muted);
}

/* Utility Classes */
.text-center {
  text-align: center;
}

.text-muted {
  color: var(--text-muted);
}

.text-primary {
  color: var(--primary);
}

.text-success {
  color: var(--success);
}

.text-lg {
  font-size: 1.125rem;
}

.text-xl {
  font-size: 1.25rem;
}

.font-semibold {
  font-weight: 600;
}

.font-bold {
  font-weight: 700;
}

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-1 { gap: var(--spacing-xs); }
.gap-2 { gap: var(--spacing-sm); }
.gap-3 { gap: var(--spacing-md); }
.gap-4 { gap: var(--spacing-lg); }

/* Responsive Helpers */
.hidden-mobile {
  display: none;
}

@media (min-width: 768px) {
  .hidden-mobile {
    display: initial;
  }
  
  .hidden-desktop {
    display: none;
  }
}

/* Very small screens */
@media (max-width: 400px) {
  .container {
    padding: 0 12px;
  }
  
  .btn {
    padding: 0.75rem 1.25rem;
    font-size: 0.9rem;
  }
  
  .btn-lg {
    padding: 0.875rem 1.5rem;
  }
}