/* =============================================================================
   ML Systems Slides Portal — Custom Styles
   Deep Rose (#BE185D) accent — lecture delivery, presentation.
   ============================================================================= */

:root {
  --mls-accent: #BE185D;
  --mls-accent-hover: #9d1550;
  --mls-accent-light: #fce7f3;
  --mls-text: #111111;
  --mls-text-muted: #555555;
  --mls-border: #e0e0e0;
  --mls-card-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  --mls-card-shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.12);
}

/* ---------- Hero Section ---------- */

.hero-section {
  text-align: center;
  padding: 3rem 1rem 2rem;
  border-bottom: 1px solid var(--mls-border);
  margin-bottom: 2rem;
}

.hero-section h1 {
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--mls-text);
  margin-bottom: 0.5rem;
}

.hero-section .hero-subtitle {
  font-size: 1.15rem;
  color: var(--mls-text-muted);
  margin-bottom: 1.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

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

.hero-stat .stat-number {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  color: var(--mls-accent);
  line-height: 1.2;
}

.hero-stat .stat-label {
  display: block;
  font-size: 0.85rem;
  color: var(--mls-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ---------- Section Headers ---------- */

.section-header {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 2.5rem 0 0.75rem;
  padding: 0.5rem 0.75rem;
  background: var(--mls-accent-light);
  border-left: 4px solid var(--mls-accent);
  border-radius: 0 6px 6px 0;
  color: var(--mls-text);
}

/* ---------- Volume / Course Cards ---------- */

.vol-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.25rem;
  margin: 1rem 0 0;
}

@media (max-width: 500px) {
  .vol-grid { grid-template-columns: 1fr; }
}

.vol-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.vol-card {
  background: #ffffff;
  border: 1px solid var(--mls-border);
  border-radius: 10px;
  padding: 1.5rem;
  transition: all 0.2s;
  text-decoration: none !important;
  color: inherit !important;
  position: relative;
  overflow: hidden;
  display: block;
  box-shadow: var(--mls-card-shadow);
}

.vol-card:hover {
  border-color: var(--mls-accent);
  box-shadow: 0 4px 16px rgba(190, 24, 93, 0.08);
}

.vol-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--mls-accent);
}

.vol-card .tag {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--mls-accent);
  margin-bottom: 0.25rem;
  display: block;
}

.vol-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0 0 0.4rem 0;
  border: none !important;
  padding: 0 !important;
  color: var(--mls-text);
}

.vol-card p {
  font-size: 0.88rem;
  color: var(--mls-text-muted);
  line-height: 1.45;
  margin-bottom: 0.5rem;
}

.vol-card .card-meta {
  font-size: 0.75rem;
  color: #94a3b8;
  border-top: 1px solid #f1f5f9;
  padding-top: 0.5rem;
  margin: 0;
}

.vol-card .vol-meta {
  font-size: 0.85rem;
  color: var(--mls-text-muted);
  margin-top: 0.75rem;
}

/* ---------- Inventory Table ---------- */

.inv-table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 0.5rem;
}

.inv-table td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid #f1f5f9;
  vertical-align: top;
  font-size: 0.9rem;
}

.inv-table td:first-child {
  width: 150px;
  font-weight: 600;
  color: var(--mls-text);
  white-space: nowrap;
}

.inv-table td:nth-child(2) {
  color: var(--mls-text-muted);
}

.inv-table td:last-child {
  width: 100px;
  text-align: right;
}

.inv-table a {
  color: var(--mls-accent) !important;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.82rem;
}

.inv-table a:hover {
  text-decoration: underline;
}

.inv-table tr:hover {
  background: #fefbfc;
}

/* ---------- Buttons ---------- */

.btn-accent {
  display: inline-block;
  background-color: var(--mls-accent);
  color: #ffffff;
  padding: 0.6rem 1.4rem;
  border-radius: 5px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background-color 0.2s ease;
  margin: 0.3rem;
}

.btn-accent:hover {
  background-color: var(--mls-accent-hover);
  color: #ffffff;
  text-decoration: none;
}

.btn-outline {
  display: inline-block;
  background-color: transparent;
  color: var(--mls-accent);
  border: 2px solid var(--mls-accent);
  padding: 0.55rem 1.4rem;
  border-radius: 5px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background-color 0.2s ease, color 0.2s ease;
  margin: 0.3rem;
}

.btn-outline:hover {
  background-color: var(--mls-accent);
  color: #ffffff;
  text-decoration: none;
}

/* ---------- Tables ---------- */

.slide-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.92rem;
}

.slide-table th {
  background-color: var(--mls-accent-light);
  color: var(--mls-text);
  font-weight: 600;
  padding: 0.6rem 0.8rem;
  text-align: left;
  border-bottom: 2px solid var(--mls-accent);
}

.slide-table td {
  padding: 0.5rem 0.8rem;
  border-bottom: 1px solid var(--mls-border);
}

.slide-table tr:hover {
  background-color: #fafafa;
}

.slide-table .num-col {
  text-align: center;
}

.slide-table .dl-col {
  text-align: center;
  white-space: nowrap;
}

.slide-table .dl-col a {
  color: var(--mls-accent);
  text-decoration: none;
  font-weight: 500;
}

.slide-table .dl-col a:hover {
  text-decoration: underline;
}

/* ---------- Info Sections ---------- */

.info-section {
  margin: 2.5rem 0;
  padding: 1.5rem;
  background-color: #fafafa;
  border-radius: 8px;
  border-left: 4px solid var(--mls-accent);
}

.info-section h2 {
  color: var(--mls-accent);
  font-size: 1.3rem;
  margin-top: 0;
}

.coming-soon {
  display: inline-block;
  background-color: var(--mls-accent-light);
  color: var(--mls-accent);
  padding: 0.2rem 0.6rem;
  border-radius: 3px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ---------- TinyML Module Cards ---------- */

.module-card {
  background: #ffffff;
  border: 1px solid var(--mls-border);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  position: relative;
  overflow: hidden;
  box-shadow: var(--mls-card-shadow);
}

.module-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--mls-accent);
}

.module-card .tag {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--mls-accent);
  margin-bottom: 0.25rem;
  display: block;
}

.module-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0 0 0.4rem 0;
  border: none !important;
  padding: 0 !important;
  color: var(--mls-text);
}

.module-card .module-desc {
  font-size: 0.92rem;
  color: var(--mls-text-muted);
  line-height: 1.5;
  margin-bottom: 0.75rem;
}

.module-card .companion {
  font-size: 0.85rem;
  color: var(--mls-text-muted);
  background: #f8fafc;
  border-radius: 6px;
  padding: 0.4rem 0.75rem;
  margin-bottom: 0.75rem;
  display: inline-block;
}

.module-card .companion a {
  color: var(--mls-accent);
  text-decoration: none;
  font-weight: 600;
}

.module-card .companion a:hover {
  text-decoration: underline;
}

/* ---------- TinyML Section List ---------- */

.section-list {
  width: 100%;
  border-collapse: collapse;
  margin: 0.5rem 0 0;
  font-size: 0.92rem;
}

.section-list th {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--mls-text-muted);
  padding: 0.4rem 0.5rem;
  border-bottom: 2px solid var(--mls-border);
  text-align: left;
}

.section-list th.dl-col {
  text-align: center;
  width: 60px;
}

.section-list td {
  padding: 0.5rem 0.5rem;
  border-bottom: 1px solid #f1f5f9;
  vertical-align: top;
}

.section-list tr:hover {
  background-color: #fafafa;
}

.section-list .sec-num {
  width: 40px;
  font-weight: 600;
  color: var(--mls-accent);
}

.section-list .sec-title {
  color: var(--mls-text);
}

.section-list .dl-col {
  text-align: center;
  white-space: nowrap;
}

.section-list a {
  color: var(--mls-accent) !important;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.85rem;
}

.section-list a:hover {
  text-decoration: underline;
}

.section-list .no-material {
  color: #cbd5e1;
  font-size: 0.85rem;
}

/* ---------- Team Box ---------- */

.team-box {
  background-color: var(--mls-accent-light);
  border: 1px solid #fce7f3;
  border-radius: 8px;
  padding: 1.5rem 2rem;
  margin-top: 2rem;
}

.team-box h3 {
  font-size: 1.1rem;
  margin: 0 0 0.5rem;
  border: none !important;
  padding: 0 !important;
  color: var(--mls-text);
}

.team-box p {
  font-size: 0.92rem;
  color: var(--mls-text-muted);
  margin: 0.2rem 0;
  line-height: 1.5;
}

/* ---------- Section Headers (Small) ---------- */

.section-header-sm {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--mls-text);
  margin: 1rem 0 0.25rem;
  padding: 0;
  border: none !important;
}

/* ---------- Material Type Badges ---------- */

a.badge-slides, a.badge-reading, a.badge-colab,
.badge-slides, .badge-reading, .badge-colab {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  text-decoration: none !important;
  cursor: pointer;
  transition: opacity 0.2s;
}

a.badge-slides:hover, a.badge-reading:hover, a.badge-colab:hover {
  opacity: 0.8;
  text-decoration: none !important;
}

a.badge-slides, .badge-slides {
  background: var(--mls-accent-light);
  color: var(--mls-accent) !important;
}

a.badge-reading, .badge-reading {
  background: #e8f5e9;
  color: #2d7a2d !important;
}

a.badge-colab, .badge-colab {
  background: #fff3e0;
  color: #e65100 !important;
}

/* ---------- Responsive ---------- */

@media (max-width: 768px) {
  .hero-section h1 {
    font-size: 1.8rem;
  }

  .hero-stats {
    gap: 1rem;
  }

  .hero-stat .stat-number {
    font-size: 1.5rem;
  }

  .vol-cards {
    grid-template-columns: 1fr;
  }

  .slide-table {
    font-size: 0.82rem;
  }

  .slide-table th,
  .slide-table td {
    padding: 0.4rem 0.5rem;
  }
}