/* ============================================
   PHASE 0 RESPONSIVE UTILITIES
   Breakpoint-specific rules and layouts
   ============================================ */

:root {
  --max-width: 1200px;
  --navbar-height: 64px;
  --section-padding-mobile: 1rem;
  --section-padding-tablet: 1.5rem;
  --section-padding-desktop: 2rem;
}

/* ============================================
   CONTAINER
   ============================================ */

.container {
  width: 100%;
  margin: 0 auto;
  padding: 0 var(--section-padding-mobile);
}

@media (min-width: 640px) {
  .container {
    padding: 0 var(--section-padding-tablet);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--section-padding-desktop);
    max-width: var(--max-width);
  }
}

/* ============================================
   SPACING UTILITIES
   ============================================ */

/* Padding */
.p-2 { padding: 0.5rem; }
.p-3 { padding: 0.75rem; }
.p-4 { padding: 1rem; }
.p-6 { padding: 1.5rem; }
.p-8 { padding: 2rem; }
.p-12 { padding: 3rem; }

.px-4 { padding-left: 1rem; padding-right: 1rem; }
.px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }
.px-8 { padding-left: 2rem; padding-right: 2rem; }

.py-4 { padding-top: 1rem; padding-bottom: 1rem; }
.py-6 { padding-top: 1.5rem; padding-bottom: 1.5rem; }
.py-8 { padding-top: 2rem; padding-bottom: 2rem; }
.py-12 { padding-top: 3rem; padding-bottom: 3rem; }
.py-16 { padding-top: 4rem; padding-bottom: 4rem; }
.py-20 { padding-top: 5rem; padding-bottom: 5rem; }

/* Margins */
.m-0 { margin: 0; }
.m-4 { margin: 1rem; }
.m-6 { margin: 1.5rem; }
.m-auto { margin: auto; }

.mx-auto { margin-left: auto; margin-right: auto; }
.my-4 { margin-top: 1rem; margin-bottom: 1rem; }
.my-6 { margin-top: 1.5rem; margin-bottom: 1.5rem; }
.my-8 { margin-top: 2rem; margin-bottom: 2rem; }

.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.mb-12 { margin-bottom: 3rem; }

.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; }

/* ============================================
   GRID LAYOUT
   ============================================ */

.grid {
  display: grid;
  gap: 1.5rem;
}

/* 2 column grid - responsive */
.grid-cols-2-responsive {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .grid-cols-2-responsive {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* 3 column grid - responsive */
.grid-cols-3-responsive {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .grid-cols-3-responsive {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .grid-cols-3-responsive {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* Gap utilities */
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }
.gap-8 { gap: 2rem; }

/* ============================================
   FLEX UTILITIES
   ============================================ */

.flex {
  display: flex;
}

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

.flex-wrap {
  flex-wrap: wrap;
}

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

.items-start {
  align-items: flex-start;
}

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

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

.gap-2 {
  gap: 0.5rem;
}

.gap-3 {
  gap: 0.75rem;
}

/* ============================================
   BREAKPOINT-SPECIFIC DISPLAY
   ============================================ */

.hidden-mobile {
  display: none;
}

@media (min-width: 768px) {
  .hidden-mobile {
    display: block;
  }
}

.hidden-tablet {
  display: none;
}

@media (max-width: 767px) {
  .hidden-tablet {
    display: block;
  }
}

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

.hidden-desktop {
  display: none;
}

@media (max-width: 1023px) {
  .hidden-desktop {
    display: block;
  }
}

@media (min-width: 1024px) {
  .hidden-desktop {
    display: none;
  }
}

/* ============================================
   RESPONSIVE SIZES
   ============================================ */

.full-width {
  width: 100%;
}

.max-w-md {
  max-width: 28rem;
}

.max-w-lg {
  max-width: 32rem;
}

.max-w-2xl {
  max-width: 42rem;
}

.max-w-3xl {
  max-width: 48rem;
}

.max-w-4xl {
  max-width: 56rem;
}

.max-w-5xl {
  max-width: 64rem;
}

.mx-auto {
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   BREAKPOINT-SPECIFIC PADDING
   ============================================ */

@media (max-width: 639px) {
  .section {
    padding: 2rem 1rem;
  }
  
  .hero {
    padding: 3rem 1rem 2rem;
  }
  
  .section h2 {
    font-size: 1.75rem;
  }
}

@media (min-width: 640px) and (max-width: 1023px) {
  .section {
    padding: 3rem 1.5rem;
  }
  
  .hero {
    padding: 4rem 1.5rem;
  }
  
  .section h2 {
    font-size: 2rem;
  }
}

@media (min-width: 1024px) {
  .section {
    padding: 4rem 2rem;
  }
  
  .hero {
    padding: 5rem 2rem;
  }
  
  .section h2 {
    font-size: 2.25rem;
  }
}

/* ============================================
   RESPONSIVE TEXT
   ============================================ */

.text-responsive-h1 {
  font-size: 1.875rem;
  line-height: 1.2;
}

@media (min-width: 640px) {
  .text-responsive-h1 {
    font-size: 2.25rem;
  }
}

@media (min-width: 1024px) {
  .text-responsive-h1 {
    font-size: 3rem;
  }
}

.text-responsive-h2 {
  font-size: 1.5rem;
  line-height: 1.3;
}

@media (min-width: 640px) {
  .text-responsive-h2 {
    font-size: 1.875rem;
  }
}

@media (min-width: 1024px) {
  .text-responsive-h2 {
    font-size: 2.25rem;
  }
}

.text-responsive-body {
  font-size: 0.95rem;
  line-height: 1.6;
}

@media (min-width: 640px) {
  .text-responsive-body {
    font-size: 1rem;
    line-height: 1.65;
  }
}

/* ============================================
   RESPONSIVE FLEX DIRECTION
   ============================================ */

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

@media (min-width: 768px) {
  .flex-col-mobile {
    flex-direction: row;
  }
}

/* ============================================
   MOBILE MENU UTILITIES
   ============================================ */

.mobile-menu-toggle {
  display: block;
}

@media (min-width: 1024px) {
  .mobile-menu-toggle {
    display: none;
  }
}

.mobile-menu {
  display: none;
  position: fixed;
  top: var(--navbar-height);
  left: 0;
  right: 0;
  background-color: white;
  border-bottom: 1px solid #e5e7eb;
  z-index: 999;
}

.mobile-menu.active {
  display: block;
}

@media (min-width: 1024px) {
  .mobile-menu {
    display: flex !important;
    position: static;
    top: auto;
    left: auto;
    right: auto;
    background-color: transparent;
    border-bottom: none;
  }
}

/* ============================================
   RESPONSIVE IMAGE
   ============================================ */

.img-fluid {
  max-width: 100%;
  height: auto;
  display: block;
}

.img-responsive {
  width: 100%;
  height: auto;
}

/* ============================================
   BREAKPOINT REFERENCE
   ============================================ */

/* 
  Mobile:   320px - 639px
  Tablet:   640px - 1023px
  Desktop:  1024px - 1439px
  Large:    1440px+
  
  @media (min-width: 640px)  - tablet and up
  @media (min-width: 1024px) - desktop and up
  @media (min-width: 1440px) - large desktop and up
  @media (max-width: 639px)  - mobile only
  @media (max-width: 1023px) - mobile and tablet
*/