:root {
  /* Stark Restrained Palette */
  --bg-color: #f4f4f0; /* Off-white background */
  --text-main: #0a0a0a; /* Pure black text */
  --accent-color: #ffcc00; /* Professional heavy-duty construction yellow */
  --border-color: #0a0a0a; /* Pure black structural lines */
  
  --font-primary: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-primary);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
  padding: 2rem;
}

/* Zero rounded corners, everything sharp */
.layout-grid {
  max-width: 1200px;
  margin: 0 auto;
  border: 3px solid var(--border-color);
  display: grid;
  grid-template-columns: 1fr;
  background-color: #ffffff;
}

/* HERO SECTION */
.hero {
  border-bottom: 3px solid var(--border-color);
  padding: 2rem 3rem;
  background-color: #ffffff;
}

.micro-copy {
  font-family: var(--font-primary);
  font-weight: 700;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.mono-data {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
}

.accent-text {
  background-color: var(--accent-color);
  color: var(--text-main);
  font-weight: 800;
  font-size: 1.05em;
  padding: 0 0.3rem;
}

.hero-top {
  margin-bottom: 1rem;
}

.massive-text {
  font-family: var(--font-primary);
  font-weight: 900;
  font-size: clamp(3rem, 8vw, 5.5rem);
  line-height: 0.9;
  letter-spacing: -0.03em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.sub-headline {
  font-size: 1.15rem;
  font-weight: 400;
  max-width: 700px;
  margin-bottom: 2rem;
}

/* Heavy solid block CTA button */
.brutalist-btn {
  background-color: var(--text-main);
  color: #ffffff;
  border: none;
  padding: 1rem 2rem;
  font-family: var(--font-primary);
  font-weight: 700;
  font-size: 1.1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.1s ease;
}

.brutalist-btn:hover {
  background-color: var(--accent-color);
  color: var(--text-main);
}

.brutalist-btn:active {
  transform: scale(0.98);
}

/* PROGRAMS GRID */
.programs-grid {
  display: flex;
  flex-direction: column;
}

.grid-header {
  padding: 1.5rem 3rem;
  border-bottom: 2px solid var(--border-color);
  background-color: #eaeaea; /* Slight contrast for headers */
}

.day-card {
  border-bottom: 2px solid var(--border-color);
  background-color: #ffffff;
}

.day-card:last-of-type {
  border-bottom: none;
}

.day-header {
  padding: 2.5rem 3rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  list-style: none;
  transition: background-color 0.2s;
}

.day-header::-webkit-details-marker {
  display: none;
}

.day-header:hover {
  background-color: #f7f7f7;
}

.day-card[open] .day-header {
  border-bottom: 2px solid var(--border-color);
  background-color: #f0f0f0;
}

.day-title {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.day-title h2 {
  font-weight: 900;
  font-size: 3rem;
  letter-spacing: -0.03em;
  text-transform: uppercase;
  line-height: 1;
}

.accent-label {
  background-color: var(--accent-color);
  color: var(--text-main);
  font-weight: 800;
  font-size: 0.85rem;
  padding: 0.5rem 1rem;
  margin-top: 0.5rem;
  display: inline-block;
}

.day-content {
  padding: 0;
  background-color: #ffffff;
}

.exercise-list {
  display: grid;
  grid-template-columns: 1fr;
}

/* Grid layout with thin borders */
.exercise-item {
  display: grid;
  grid-template-columns: 250px 1fr;
  border-bottom: 1px solid var(--border-color);
}

.exercise-item:last-child {
  border-bottom: none;
}

.ex-name-container {
  padding: 1.5rem 3rem;
  border-right: 1px solid var(--border-color);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 1.1rem;
}

.ex-details-container {
  padding: 1.5rem 3rem;
  font-family: var(--font-mono);
  font-size: 1rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  gap: 1rem;
}

.ex-images {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.exercise-img {
  width: 150px;
  height: 150px;
  object-fit: cover;
  border: 2px solid var(--border-color);
  background-color: #ffffff;
}

/* GUIDELINES SECTION */
.guidelines-section {
  background-color: #ffffff;
  border-top: 3px solid var(--border-color);
}

.guidelines-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.guide-item {
  padding: 3rem;
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.guide-item:nth-child(even) {
  border-right: none;
}

.guide-item:nth-last-child(-n+2) {
  border-bottom: none;
}

.guide-item .mono-data {
  display: inline-block;
  background-color: var(--accent-color);
  color: var(--text-main);
  padding: 0.25rem 0.6rem;
  margin-bottom: 1.5rem;
  font-weight: 800;
  font-size: 1.1rem;
}

.guide-item p {
  font-size: 1.15rem;
}

/* FOOTER */
.footer {
  background-color: var(--text-main);
  color: var(--bg-color);
  padding: 4rem 3rem;
  border-top: 3px solid var(--border-color);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.footer-col.align-right {
  text-align: right;
  justify-content: flex-end;
}

.footer .micro-copy {
  color: #a0a0a0;
}

.footer p {
  font-weight: 700;
  font-size: 1.1rem;
  max-width: 300px;
}

/* Responsive Grid Adjustments */
@media (max-width: 900px) {
  .day-header {
    flex-direction: column;
    gap: 1.5rem;
  }
  .exercise-item {
    grid-template-columns: 1fr;
  }
  .ex-name-container {
    border-right: none;
    border-bottom: 1px dashed var(--border-color);
    padding-bottom: 1rem;
  }
  .ex-details-container {
    padding-top: 1rem;
  }
}

@media (max-width: 768px) {
  body {
    padding: 1rem;
  }
  .hero {
    padding: 1.5rem 1.5rem;
  }
  .massive-text {
    font-size: clamp(2.5rem, 10vw, 4rem);
  }
  .day-header, .ex-name-container, .ex-details-container, .grid-header, .guide-item {
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }
  .guide-item {
    padding: 2rem 1.5rem;
  }
  .guidelines-content {
    grid-template-columns: 1fr;
  }
  .guide-item {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }
  .guide-item:last-child {
    border-bottom: none;
  }
  .footer {
    padding: 3rem 1.5rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  .footer-col.align-right {
    text-align: left;
    justify-content: flex-start;
  }
}