/* ===================================================
   LAYOUT.CSS — CORE LAYOUT SYSTEMS & RESPONSIVENESS
   MD Saib Hossain Portfolio
   =================================================== */

/* ===== GLOBAL CONTAINERS ===== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  width: 100%;
}

.container-sm { max-width: 800px; }
.container-md { max-width: 1000px; }
.container-lg { max-width: 1200px; }
.container-xl { max-width: 1400px; }

/* ===== SECTION PADDING & WRAPPERS ===== */
.section {
  padding: 5.5rem 0;
  position: relative;
}

.section-sm { padding: 3.5rem 0; }
.section-lg { padding: 7.5rem 0; }

.section-header {
  margin-bottom: 3rem;
  text-align: center;
}

.section-header.text-left {
  text-align: left;
}

.section-title {
  font-size: clamp(1.85rem, 3.5vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 0.75rem;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 48px;
  height: 3.5px;
  background: var(--gradient-main);
  border-radius: var(--radius-full);
}

.section-header.text-center .section-title::after {
  left: 50%;
  transform: translateX(-50%);
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 650px;
  margin: 0 auto;
  line-height: 1.65;
}

/* ===== PAGE BANNER / HEADER (FOR SUBPAGES) ===== */
.page-header {
  padding: 5rem 0 3rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 300px;
  background: var(--gradient-glow);
  opacity: 0.6;
  pointer-events: none;
  z-index: 0;
}

.page-header h1 {
  font-size: clamp(2.4rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
  position: relative;
  z-index: 1;
}

.page-description,
.page-header p {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
  line-height: 1.7;
}

/* ===== GRID SYSTEMS ===== */
.grid-1 { display: grid; grid-template-columns: 1fr; gap: 1.5rem; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }

.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
  gap: 1.75rem;
}

.grid-auto-sm {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
  gap: 1.25rem;
}

/* ===== SPLIT LAYOUTS ===== */
.split-layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3.5rem;
  align-items: center;
}

.split-layout-reverse {
  grid-template-columns: 0.8fr 1.2fr;
}

/* ===== RESPONSIVE BREAKPOINTS ===== */
@media (max-width: 1024px) {
  .section { padding: 4.5rem 0; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .split-layout, .split-layout-reverse {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 768px) {
  .section { padding: 3.75rem 0; }
  .page-header { padding: 3.5rem 0 2rem; }
  .grid-2 { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr; }
  .section-title { font-size: 1.85rem; }
}

@media (max-width: 480px) {
  .section { padding: 3rem 0; }
  .page-header { padding: 2.75rem 0 1.5rem; }
}