/* ==========================================================================
   KLIMAX Teplice – Layout Primitives
   --------------------------------------------------------------------------
   Container, section, and grid utilities. Mobile-first with progressive
   enhancement at sm (480), md (768), lg (1024), xl (1280) breakpoints.
   ========================================================================== */


/* ==========================================================================
   1. CONTAINER
   ========================================================================== */

.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

/* Narrower container variant for text-heavy content */
.container--narrow {
  max-width: 800px;
}

/* Wider container for full-bleed sections */
.container--wide {
  max-width: 1400px;
}


/* ==========================================================================
   2. SECTION
   ========================================================================== */

.section {
  padding-top: 3rem;
  padding-bottom: 3rem;
  position: relative;
}

/* --- Section Header ------------------------------------------------------- */
.section__header {
  text-align: center;
  margin-bottom: 2rem;
}

.section__title {
  position: relative;
  display: inline-block;
  margin-bottom: 1rem;
}

/* Accent underline beneath section titles */
.section__title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 48px;
  height: 3px;
  background: var(--accent-klimax);
  border-radius: 2px;
  transition: width var(--transition-base);
}

.section__title:hover::after {
  width: 72px;
}

.section__subtitle {
  color: var(--text-secondary);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  margin-top: 1rem;
  font-size: 1rem;
  line-height: 1.7;
}

/* --- Dark Section Variant ------------------------------------------------- */
.section--dark {
  background-color: var(--bg-primary);
  color: #ffffff;
}

.section--dark .section__title {
  color: #ffffff;
}

.section--dark .section__subtitle {
  color: rgba(255, 255, 255, 0.7);
}


/* ==========================================================================
   3. GRID UTILITIES
   ========================================================================== */

/*
 * Reusable grid system. Each grid defaults to single column (mobile-first)
 * and expands at larger breakpoints via media queries below.
 */

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

.grid--2 { --grid-columns: 2; }
.grid--3 { --grid-columns: 3; }
.grid--4 { --grid-columns: 4; }


/* ==========================================================================
   4. RESPONSIVE BREAKPOINTS (Mobile-First)
   ========================================================================== */

/* --- sm: 480px ------------------------------------------------------------ */
@media (min-width: 480px) {
  .section__subtitle {
    font-size: 1.0625rem;
  }
}

/* --- md: 768px ------------------------------------------------------------ */
@media (min-width: 768px) {
  .container {
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }

  .section {
    padding-top: 4rem;
    padding-bottom: 4rem;
  }

  .section__header {
    margin-bottom: 2.5rem;
  }

  .section__subtitle {
    font-size: 1.125rem;
  }

  /* Grid expands to 2 columns at md */
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* --- lg: 1024px ----------------------------------------------------------- */
@media (min-width: 1024px) {
  .section {
    padding-top: 5rem;
    padding-bottom: 5rem;
  }

  .section__header {
    margin-bottom: 3rem;
  }

  /* 3-col grid at lg */
  .grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }

  /* 4-col grid starts as 3 at lg */
  .grid--4 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* --- xl: 1280px ----------------------------------------------------------- */
@media (min-width: 1280px) {
  .container {
    padding-left: 2rem;
    padding-right: 2rem;
  }

  /* Full 4-col grid at xl */
  .grid--4 {
    grid-template-columns: repeat(4, 1fr);
  }
}