:root {
  --pr-ink: #0f172a;
  --pr-muted: #5f6b7a;
  --pr-body: #283240;
  --pr-line: #e7ebf3;
  --pr-line-strong: #d9e2f5;
  --pr-card: rgba(255, 255, 255, 0.84);
  --pr-card-solid: #ffffff;
  --pr-surface: #f8faff;
  --pr-accent: #4067D9;
  --pr-accent-2: #6d8cff;
  --pr-accent-soft: #eef2ff;
  --pr-accent-glow: rgba(64, 103, 217, 0.12);
  --pr-radius-lg: 26px;
  --pr-radius-md: 18px;
  --pr-radius-sm: 14px;
  --pr-shadow-sm: 0 10px 24px rgba(17, 24, 39, 0.06);
  --pr-shadow-md: 0 18px 40px rgba(17, 24, 39, 0.08);
  --pr-shadow-lg: 0 28px 64px rgba(17, 24, 39, 0.12);
}

/* section */
#problem-statement.problem-section {
  position: relative;
  overflow: clip;
  padding: clamp(48px, 6vw, 92px) 0;
  background:
    radial-gradient(circle at 10% 12%, rgba(64, 103, 217, 0.045), transparent 24%),
    radial-gradient(circle at 88% 22%, rgba(64, 103, 217, 0.05), transparent 22%);
}

/* shell */
#problem-statement .problem-shell {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 32px);
  display: grid;
  gap: 28px;
}

/* header */
#problem-statement .problem-header {
  display: grid;
  gap: 12px;
  max-width: 760px;
  animation: problemIntroUp 0.72s cubic-bezier(.2,.7,.2,1) both;
}

#problem-statement .problem-kicker {
  margin: 0;
  width: fit-content;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(64, 103, 217, 0.12);
  box-shadow: 0 8px 18px rgba(17, 24, 39, 0.04);
  font-size: 12px;
  line-height: 1.2;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--pr-accent);
  font-weight: 800;
}

#problem-statement .problem-title {
  margin: 0;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.06;
  letter-spacing: -0.03em;
  font-weight: 800;
  color: var(--pr-ink);
  max-width: 16ch;
  text-wrap: balance;
}

#problem-statement .problem-intro {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--pr-muted);
  max-width: 66ch;
}

/* list */
#problem-statement .problem-list {
  display: grid;
  gap: 18px;
}

/* item */
#problem-statement .problem-item {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  background: var(--pr-card);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--pr-line);
  border-radius: var(--pr-radius-lg);
  padding: 20px;
  box-shadow: var(--pr-shadow-sm);
  transition:
    transform 0.28s cubic-bezier(.2,.7,.2,1),
    box-shadow 0.28s cubic-bezier(.2,.7,.2,1),
    border-color 0.28s ease,
    background 0.28s ease;
}

#problem-statement .problem-item::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at top right, rgba(64, 103, 217, 0.11), transparent 36%);
  opacity: 0;
  transition: opacity 0.28s ease;
  z-index: -1;
}

#problem-statement .problem-item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 3px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--pr-accent), var(--pr-accent-2));
  transform: scaleY(0.2);
  transform-origin: top;
  opacity: 0.35;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

#problem-statement .problem-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--pr-shadow-lg);
  border-color: var(--pr-line-strong);
  background: var(--pr-card-solid);
}

#problem-statement .problem-item:hover::before {
  opacity: 1;
}

#problem-statement .problem-item:hover::after {
  transform: scaleY(1);
  opacity: 1;
}

/* icon */
#problem-statement .problem-icon {
  margin: 0;
  position: relative;
  width: 96px;
  height: 96px;
  display: grid;
  place-items: center;
  background: linear-gradient(180deg, #ffffff 0%, #f7f9ff 100%);
  border: 1px solid #dde5ff;
  border-radius: 22px;
  box-shadow: 0 10px 22px rgba(64, 103, 217, 0.08);
  transition:
    transform 0.28s cubic-bezier(.2,.7,.2,1),
    box-shadow 0.28s ease,
    border-color 0.28s ease,
    background 0.28s ease;
}

#problem-statement .problem-icon::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(circle at 30% 25%, rgba(255,255,255,0.7), transparent 45%);
  pointer-events: none;
}

#problem-statement .problem-svg {
  width: 52px;
  height: 52px;
  display: block;
  transition: transform 0.28s cubic-bezier(.2,.7,.2,1), filter 0.28s ease;
}

#problem-statement .problem-item:hover .problem-icon {
  transform: translateY(-2px) scale(1.03);
  border-color: #cfdafe;
  background: linear-gradient(180deg, #ffffff 0%, #eef3ff 100%);
  box-shadow: 0 16px 30px rgba(64, 103, 217, 0.14);
}

#problem-statement .problem-item:hover .problem-svg {
  transform: scale(1.04);
  filter: drop-shadow(0 8px 14px rgba(64, 103, 217, 0.08));
}

/* copy */
#problem-statement .problem-copy {
  display: grid;
  gap: 8px;
}

#problem-statement .problem-copy h3 {
  margin: 0;
  font-size: clamp(20px, 2.4vw, 30px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--pr-ink);
  transition: color 0.28s ease, transform 0.28s ease;
}

#problem-statement .problem-copy p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--pr-body);
  max-width: 60ch;
  transition: color 0.28s ease, transform 0.28s ease;
}

#problem-statement .problem-item:hover .problem-copy h3 {
  color: var(--pr-accent);
  transform: translateY(-1px);
}

#problem-statement .problem-item:hover .problem-copy p {
  color: #23304d;
  transform: translateY(-1px);
}

/* differentiated hover personality */
#problem-statement .problem-item:nth-child(1):hover .problem-icon {
  transform: translateY(-2px) scale(1.04) rotate(-1.5deg);
}

#problem-statement .problem-item:nth-child(2):hover .problem-icon {
  transform: translateY(-3px) scale(1.05);
}

#problem-statement .problem-item:nth-child(3):hover .problem-icon {
  transform: translateY(-2px) scale(1.04) rotate(1.5deg);
}

/* quote */
#problem-statement .problem-quote {
  margin: 8px 0 0;
  position: relative;
  overflow: hidden;
  padding: 20px 22px;
  border-radius: var(--pr-radius-md);
  background:
    linear-gradient(180deg, rgba(238, 242, 255, 0.9) 0%, rgba(245, 248, 255, 0.96) 100%);
  border: 1px solid #dbe4ff;
  box-shadow: 0 10px 22px rgba(64, 103, 217, 0.05);
}

#problem-statement .problem-quote::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: linear-gradient(180deg, var(--pr-accent), var(--pr-accent-2));
}

#problem-statement .problem-quote::after {
  content: "”";
  position: absolute;
  right: 18px;
  top: 8px;
  font-size: 64px;
  line-height: 1;
  color: rgba(64, 103, 217, 0.12);
  font-weight: 800;
  pointer-events: none;
}

#problem-statement .problem-quote blockquote {
  margin: 0;
  max-width: 70ch;
  font-size: 15px;
  line-height: 1.75;
  font-style: italic;
  color: #23304d;
  position: relative;
  z-index: 1;
}

/* motion */
@media (prefers-reduced-motion: no-preference) {
  #problem-statement .problem-item {
    animation: problemCardIn 0.58s cubic-bezier(.2,.7,.2,1) both;
  }

  #problem-statement .problem-item:nth-child(1) {
    animation-delay: 0.05s;
  }

  #problem-statement .problem-item:nth-child(2) {
    animation-delay: 0.11s;
  }

  #problem-statement .problem-item:nth-child(3) {
    animation-delay: 0.17s;
  }

  #problem-statement .problem-quote {
    animation: problemQuoteIn 0.7s cubic-bezier(.2,.7,.2,1) 0.2s both;
  }
}

@keyframes problemIntroUp {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes problemCardIn {
  from {
    opacity: 0;
    transform: translateY(14px) scale(0.985);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes problemQuoteIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* reduced motion */
@media (prefers-reduced-motion: reduce) {
  #problem-statement .problem-header,
  #problem-statement .problem-item,
  #problem-statement .problem-item::before,
  #problem-statement .problem-item::after,
  #problem-statement .problem-icon,
  #problem-statement .problem-svg,
  #problem-statement .problem-copy h3,
  #problem-statement .problem-copy p,
  #problem-statement .problem-quote {
    animation: none !important;
    transition: none !important;
    transform: none !important;
  }
}

/* responsive */
@media (max-width: 760px) {
  #problem-statement .problem-item {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  #problem-statement .problem-icon {
    width: 84px;
    height: 84px;
    border-radius: 20px;
  }

  #problem-statement .problem-svg {
    width: 46px;
    height: 46px;
  }
}

@media (max-width: 640px) {
  #problem-statement.problem-section {
    padding: 34px 0 58px;
  }

  #problem-statement .problem-shell {
    gap: 22px;
    padding: 0 20px;
  }

  #problem-statement .problem-title {
    font-size: 32px;
    line-height: 1.08;
  }

  #problem-statement .problem-intro,
  #problem-statement .problem-copy p,
  #problem-statement .problem-quote blockquote {
    font-size: 14px;
    line-height: 1.72;
  }

  #problem-statement .problem-item {
    padding: 18px 16px;
    border-radius: 22px;
  }

  #problem-statement .problem-copy h3 {
    font-size: 22px;
  }

  #problem-statement .problem-quote {
    padding: 18px 18px 18px 20px;
  }

  #problem-statement .problem-quote::after {
    font-size: 48px;
    right: 14px;
    top: 8px;
  }
}