/* Layout & Grid System */

/* Container */

.container {
  width: 100%;
  max-width: var(--max-width-container);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-4);
  }
}

.container--narrow {
  max-width: var(--max-width-narrow);
}

/* Grid System */

.grid {
  display: grid;
  gap: var(--space-8);
}

.grid--2-cols {
  grid-template-columns: repeat(2, 1fr);
}

.grid--3-cols {
  grid-template-columns: repeat(3, 1fr);
}

.grid--4-cols {
  grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 1024px) {
  .grid--4-cols {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .grid--2-cols,
  .grid--3-cols,
  .grid--4-cols {
    grid-template-columns: 1fr;
  }
}

/* Flexbox */

.flex {
  display: flex;
}

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

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

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

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

.gap-4 {
  gap: var(--space-4);
}

.gap-6 {
  gap: var(--space-6);
}

.gap-8 {
  gap: var(--space-8);
}

/* Sections */

section {
  width: min(100vw, 177.7778vh);
  height: min(100vh, 56.25vw);
  aspect-ratio: 16 / 9;
  box-sizing: border-box;
  padding: clamp(24px, 4vh, 64px) 0;
  margin: 0 auto;
  overflow: hidden;
}

section > .container,
section > .container.container--narrow {
  height: 100%;
  overflow: hidden;
}

@media (max-width: 768px) {
  section {
    width: 100%;
    height: auto;
    aspect-ratio: auto;
    overflow: visible;
    padding: clamp(18px, 3vh, 40px) 0;
  }

  section > .container,
  section > .container.container--narrow {
    height: auto;
    overflow: visible;
  }
}

section.section--hero {
  padding-top: var(--space-32);
  padding-bottom: var(--space-32);
  background-color: var(--color-bg-light);
  border-bottom: 1px solid #f0f0f0;
}

section.section--alt {
  background-color: var(--color-bg-secondary);
}

/* Slide-fit typography and dense section compaction for 16:9 */
section h2 {
  font-size: clamp(1.9rem, 4vh, 3.2rem);
  margin-bottom: clamp(12px, 1.6vh, 24px);
}

section p,
section li {
  font-size: clamp(0.92rem, 1.65vh, 1.12rem);
  line-height: 1.45;
}

#problem .prose,
#maintenance .prose {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 24px;
  margin-top: 16px;
}

#problem .prose p,
#maintenance .prose p {
  margin-bottom: 0;
}

#problem img {
  margin-top: 16px !important;
  max-height: 34vh;
  object-fit: contain;
}

#maintenance .steps,
#validation .steps {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 12px;
  margin-top: 16px;
}

#maintenance .steps li,
#validation .steps li {
  margin-bottom: 0;
  padding: 12px 14px;
  gap: 10px;
}

#maintenance .steps li::before,
#validation .steps li::before {
  width: 30px;
  height: 30px;
  font-size: var(--font-size-base);
}

#maintenance .steps li h4,
#validation .steps li h4 {
  margin-bottom: 0;
  font-size: clamp(1rem, 1.9vh, 1.45rem);
}

#validation .steps li p {
  margin-top: 4px;
}

#maintenance .highlight-box,
#validation .highlight-box {
  margin-top: 14px;
  padding: 12px 16px;
}

/* Architecture section: keep image inside slide */
#architecture h2 {
  margin-bottom: 8px;
}

#architecture .container > p.mt-8 {
  margin-top: 8px;
  margin-bottom: 0;
}

#contact #contact-form {
  margin-top: 14px;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px 12px;
}

#contact #contact-form > .grid {
  grid-column: 1 / -1;
  gap: 10px 12px;
}

#contact #contact-form > .grid.grid--2-cols {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

#contact #contact-form > .form-group {
  grid-column: span 3;
  margin-bottom: 0;
}

#contact #contact-form > .btn {
  grid-column: 1 / -1;
  margin-top: 2px;
  padding: 10px 14px;
}

#contact .form-group label {
  margin-bottom: 4px;
  font-size: var(--font-size-sm);
}

#contact input,
#contact select,
#contact textarea {
  padding: 8px 10px;
  font-size: var(--font-size-sm);
}

#contact .form-group textarea {
  min-height: 64px;
  resize: none;
}

@media (max-width: 768px) {
  #problem .prose,
  #maintenance .prose,
  #maintenance .steps,
  #validation .steps {
    grid-template-columns: 1fr;
  }

  #maintenance .steps li,
  #validation .steps li {
    margin-bottom: 8px;
  }

  #contact #contact-form {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  #contact #contact-form > .grid.grid--2-cols {
    grid-template-columns: 1fr;
  }

  #contact #contact-form > .form-group,
  #contact #contact-form > .btn {
    grid-column: 1;
  }
}

/* Spacing Utilities */

.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mt-16 { margin-top: var(--space-16); }
.mt-24 { margin-top: var(--space-24); }

.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }
.mb-16 { margin-bottom: var(--space-16); }
.mb-24 { margin-bottom: var(--space-24); }

.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }
.px-8 { padding-left: var(--space-8); padding-right: var(--space-8); }

.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.py-6 { padding-top: var(--space-6); padding-bottom: var(--space-6); }
.py-8 { padding-top: var(--space-8); padding-bottom: var(--space-8); }

/* Text Utilities */

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

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

.text-right {
  text-align: right;
}

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

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

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

.text-sm {
  font-size: var(--font-size-sm);
}

.text-xs {
  font-size: var(--font-size-xs);
}

.text-lg {
  font-size: var(--font-size-lg);
}

.text-xl {
  font-size: var(--font-size-xl);
}

.font-bold {
  font-weight: var(--font-weight-bold);
}

.font-semibold {
  font-weight: var(--font-weight-semibold);
}

/* Display Utilities */

.hidden {
  display: none;
}

.block {
  display: block;
}

.inline-block {
  display: inline-block;
}

.inline {
  display: inline;
}

/* Max Width */

.max-w-narrow {
  max-width: var(--max-width-narrow);
  margin-left: auto;
  margin-right: auto;
}

/* Visibility */

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

@media (min-width: 769px) {
  .show-mobile {
    display: none;
  }
}