/* ================================================================
   SERVEMASTER CASE STUDY — servemaster.css
   Editorial layout · Emerald accents · Large whitespace
   ================================================================ */

/* ── Tokens ──────────────────────────────────────────────────── */
:root {
  --cs-emerald:      #059669;
  --cs-emerald-lt:   #d1fae5;
  --cs-emerald-mid:  #10b981;
  --cs-ink:          #111111;
  --cs-muted:        #6b7280;
  --cs-tint:         #f7f7f5;
  --cs-white:        #ffffff;
  --cs-divider:      rgba(17, 17, 17, 0.10);
  --cs-border:       rgba(17, 17, 17, 0.08);

  --cs-space-section: 120px;
  --cs-space-sm:      48px;
  --cs-space-md:      72px;
}

/* ── Body override for case study ───────────────────────────── */
.cs-page {
  background: var(--cs-white);
  color: var(--cs-ink);
}

/* ── Shared reveal animations ───────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.72s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.72s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1.is-visible { transition-delay: 0.10s; }
.reveal-delay-2.is-visible { transition-delay: 0.20s; }
.reveal-delay-3.is-visible { transition-delay: 0.30s; }

/* ================================================================
   HERO
   ================================================================ */
.cs-hero {
  padding-top: 160px;
  padding-bottom: var(--cs-space-md);
}

.cs-hero__inner {
  max-width: 880px;
}

/* Breadcrumb */
.cs-breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 56px;
}
.cs-breadcrumb__link {
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cs-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}
.cs-breadcrumb__link:hover { color: var(--cs-emerald); }
.cs-breadcrumb__sep {
  color: var(--cs-muted);
  font-size: 11px;
}
.cs-breadcrumb__current {
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cs-emerald);
}

/* Meta row */
.cs-hero__meta {
  display: flex;
  align-items: center;
  gap: 32px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.cs-hero__meta-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.cs-hero__meta-label {
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cs-muted);
  font-family: 'Inter', sans-serif;
  font-weight: 500;
}
.cs-hero__meta-value {
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  font-weight: 500;
  color: var(--cs-ink);
}
.cs-hero__meta-divider {
  width: 1px;
  height: 32px;
  background: var(--cs-divider);
}

/* Hero title */
.cs-hero__title {
  font-family: 'IBM Plex Serif', serif;
  font-size: clamp(56px, 10vw, 112px);
  font-weight: 300;
  line-height: 1.0;
  letter-spacing: -0.02em;
  color: var(--cs-ink);
  margin: 0 0 32px;
}

/* Hero subtitle */
.cs-hero__subtitle {
  font-family: 'Inter', sans-serif;
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 300;
  line-height: 1.65;
  color: var(--cs-muted);
  margin: 0 0 48px;
  max-width: 640px;
}

/* Hero divider */
.cs-hero__divider {
  width: 100%;
  height: 1px;
  background: var(--cs-divider);
  margin-bottom: 48px;
}

/* Hero summary */
.cs-hero__summary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  max-width: 800px;
}
.cs-hero__summary-text {
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  font-weight: 400;
  line-height: 1.7;
  color: #444;
  margin: 0;
}

@media (max-width: 640px) {
  .cs-hero__summary { grid-template-columns: 1fr; }
  .cs-hero__meta { gap: 20px; }
  .cs-hero__meta-divider { display: none; }
}

/* ================================================================
   SECTION SHARED LAYOUT
   ================================================================ */
.cs-section {
  padding: var(--cs-space-section) 0;
}
.cs-section--tinted {
  background: var(--cs-tint);
}
.cs-section--product {
  background: var(--cs-ink);
  color: var(--cs-white);
}
.cs-section--product .cs-section__headline,
.cs-section--product .cs-section__lead,
.cs-section--product .cs-section__number {
  color: var(--cs-white);
}
.cs-section--product .cs-section__divider {
  background: rgba(255,255,255,0.10);
}
.cs-section--learnings {
  background: var(--cs-white);
}

/* Section divider */
.cs-section__divider {
  width: 100%;
  height: 1px;
  background: var(--cs-divider);
  margin-bottom: 72px;
}

/* Section two-column inner */
.cs-section__inner {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 0 56px;
  align-items: start;
}

.cs-section__label-col {
  padding-top: 8px;
}

.cs-section__number {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cs-emerald);
}

.cs-section__headline {
  font-family: 'IBM Plex Serif', serif;
  font-size: clamp(36px, 5.5vw, 72px);
  font-weight: 300;
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--cs-ink);
  margin: 0 0 40px;
  text-transform: uppercase;
}

.cs-section__lead {
  font-family: 'Inter', sans-serif;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 300;
  line-height: 1.6;
  color: var(--cs-ink);
  margin: 0 0 24px;
  max-width: 600px;
}

.cs-section__text {
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  font-weight: 400;
  line-height: 1.75;
  color: #555;
  margin: 0 0 16px;
  max-width: 560px;
}

@media (max-width: 680px) {
  .cs-section__inner {
    grid-template-columns: 1fr;
    gap: 24px 0;
  }
}

/* ================================================================
   PAIN POINTS LIST
   ================================================================ */
.cs-pain-points {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--cs-border);
}
.cs-pain-points__label {
  display: block;
  margin-bottom: 20px;
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cs-muted);
}
.cs-pain-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.cs-pain-list__item {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  font-weight: 400;
  color: var(--cs-ink);
  line-height: 1.5;
}
.cs-pain-list__icon {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cs-emerald);
  flex-shrink: 0;
}

/* ================================================================
   INSIGHT CARDS
   ================================================================ */
.cs-insight-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: 48px;
}

.cs-insight-card {
  padding: 36px 0;
  border-top: 1px solid var(--cs-border);
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 0 32px;
  align-items: start;
  transition: background 0.2s ease;
}
.cs-insight-card:last-child {
  border-bottom: 1px solid var(--cs-border);
}
.cs-insight-card:hover {
  background: rgba(5, 150, 105, 0.03);
}

.cs-insight-card__number {
  font-family: 'IBM Plex Serif', serif;
  font-size: 36px;
  font-weight: 300;
  color: var(--cs-emerald);
  line-height: 1;
  padding-top: 4px;
}

.cs-insight-card__text {
  font-family: 'Inter', sans-serif;
  font-size: clamp(15px, 1.8vw, 18px);
  font-weight: 400;
  line-height: 1.65;
  color: var(--cs-ink);
  margin: 0;
}
.cs-insight-card__text em {
  font-style: normal;
  color: var(--cs-emerald);
  font-weight: 500;
}

/* ================================================================
   SOLUTION PILLARS
   ================================================================ */
.cs-pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  margin-top: 48px;
}

.cs-pillar {
  padding: 40px 32px 36px;
  background: var(--cs-white);
  border: 1px solid var(--cs-border);
  position: relative;
  overflow: hidden;
  transition: border-color 0.25s ease, transform 0.25s ease;
}
.cs-pillar:hover {
  border-color: var(--cs-emerald);
  transform: translateY(-4px);
}
.cs-pillar:hover .cs-pillar__accent {
  opacity: 1;
  transform: scaleX(1);
}

.cs-pillar__accent {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cs-emerald), var(--cs-emerald-mid));
  opacity: 0;
  transform: scaleX(0);
  transform-origin: left;
  transition: opacity 0.3s ease, transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

.cs-pillar__header {
  margin-bottom: 20px;
}
.cs-pillar__tag {
  font-family: 'Inter', sans-serif;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cs-emerald);
  display: block;
  margin-bottom: 12px;
}
.cs-pillar__title {
  font-family: 'IBM Plex Serif', serif;
  font-size: clamp(20px, 2.5vw, 26px);
  font-weight: 400;
  line-height: 1.2;
  color: var(--cs-ink);
  margin: 0;
}
.cs-pillar__desc {
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  font-weight: 400;
  line-height: 1.7;
  color: var(--cs-muted);
  margin: 0;
}

@media (max-width: 768px) {
  .cs-pillars { grid-template-columns: 1fr; gap: 12px; }
}

/* ================================================================
   PRODUCT SCREENS (Section 04 — dark background)
   ================================================================ */
.cs-screens {
  margin-top: 80px;
  display: flex;
  flex-direction: column;
  gap: 48px;
}

.cs-screen {
  margin: 0;
  position: relative;
}

.cs-screen__frame {
  width: 100%;
  border-radius: 12px;
  overflow: hidden;
  background: #1a1a1a;
  border: 1px solid rgba(255,255,255,0.07);
  box-shadow: 0 24px 80px rgba(0,0,0,0.5), 0 4px 16px rgba(0,0,0,0.3);
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 0.4s ease;
}
.cs-screen__frame:hover {
  transform: translateY(-6px);
  box-shadow: 0 40px 100px rgba(0,0,0,0.6), 0 8px 24px rgba(0,0,0,0.4);
}

.cs-screen__img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* Placeholder for screens without images */
.cs-screen__frame--placeholder {
  background: #1e1e1e;
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
}
.cs-screen__placeholder-label {
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  color: rgba(255,255,255,0.3);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.cs-screen__caption {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 20px;
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  font-weight: 400;
  color: rgba(255,255,255,0.45);
}
.cs-screen__caption-num {
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cs-emerald-mid);
  font-weight: 500;
}

/* ================================================================
   IMPACT CARDS (Section 05)
   ================================================================ */
.cs-impact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin-top: 48px;
  background: var(--cs-border);
  border: 1px solid var(--cs-border);
  border-radius: 4px;
  overflow: hidden;
}

.cs-impact-card {
  padding: 48px 40px;
  background: var(--cs-tint);
  position: relative;
  transition: background 0.2s ease;
}
.cs-impact-card:hover {
  background: var(--cs-white);
}
.cs-impact-card:hover .cs-impact-card__accent {
  transform: scaleY(1);
}

.cs-impact-card__accent {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--cs-emerald), var(--cs-emerald-mid));
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

.cs-impact-card__text {
  font-family: 'IBM Plex Serif', serif;
  font-size: clamp(18px, 2.5vw, 24px);
  font-weight: 300;
  line-height: 1.3;
  color: var(--cs-ink);
  margin: 0;
}

@media (max-width: 560px) {
  .cs-impact-grid { grid-template-columns: 1fr; }
}

/* ================================================================
   KEY LEARNINGS (Section 06)
   ================================================================ */
.cs-learning-quote {
  border-left: 3px solid var(--cs-emerald);
  padding-left: 32px;
  margin: 0 0 32px;
}
.cs-learning-quote p {
  font-family: 'IBM Plex Serif', serif;
  font-size: clamp(22px, 3.5vw, 40px);
  font-weight: 300;
  line-height: 1.35;
  color: var(--cs-ink);
  font-style: italic;
  margin: 0;
}

/* ================================================================
   NEXT PROJECT NAVIGATION
   ================================================================ */
.cs-next-projects {
  padding: var(--cs-space-section) 0;
  background: var(--cs-white);
}

.cs-next-projects__header {
  margin-bottom: 48px;
}
.cs-next-projects__header .label {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cs-muted);
}

.cs-next-projects__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--cs-border);
  border: 1px solid var(--cs-border);
  border-radius: 4px;
  overflow: hidden;
}

.cs-next-card {
  display: flex;
  flex-direction: column;
  padding: 40px 36px;
  background: var(--cs-white);
  text-decoration: none;
  color: var(--cs-ink);
  position: relative;
  overflow: hidden;
  transition: background 0.25s ease, transform 0.25s ease;
  group: true;
}
.cs-next-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cs-emerald), var(--cs-emerald-mid));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}
.cs-next-card:hover {
  background: var(--cs-tint);
}
.cs-next-card:hover::after {
  transform: scaleX(1);
}
.cs-next-card:hover .cs-next-card__arrow {
  transform: translateX(6px);
}

.cs-next-card__number {
  font-family: 'Inter', sans-serif;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cs-emerald);
  margin-bottom: 16px;
  display: block;
}

.cs-next-card__title {
  font-family: 'IBM Plex Serif', serif;
  font-size: clamp(20px, 2.5vw, 28px);
  font-weight: 300;
  line-height: 1.2;
  color: var(--cs-ink);
  margin: 0 0 12px;
}

.cs-next-card__role {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--cs-muted);
  text-transform: uppercase;
  margin-top: auto;
  padding-top: 24px;
}

.cs-next-card__arrow {
  position: absolute;
  bottom: 36px;
  right: 32px;
  color: var(--cs-ink);
  transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1);
  display: flex;
}
.cs-next-card__arrow svg {
  width: 18px;
  height: 18px;
}

@media (max-width: 768px) {
  .cs-next-projects__grid { grid-template-columns: 1fr; }
}

/* ================================================================
   RESPONSIVE ADJUSTMENTS
   ================================================================ */
@media (max-width: 1024px) {
  :root {
    --cs-space-section: 88px;
    --cs-space-md: 56px;
  }
  .cs-hero { padding-top: 128px; }
  .cs-hero__title { font-size: clamp(48px, 9vw, 80px); }
}

@media (max-width: 768px) {
  :root {
    --cs-space-section: 72px;
  }
  .cs-hero { padding-top: 112px; }
  .cs-hero__title { font-size: clamp(40px, 10vw, 64px); }
  .cs-section__inner {
    grid-template-columns: 1fr;
    gap: 20px 0;
  }
  .cs-pillar { padding: 32px 24px; }
  .cs-impact-card { padding: 36px 28px; }
  .cs-next-card { padding: 32px 28px; }
}

@media (max-width: 480px) {
  .cs-hero { padding-top: 96px; }
  .cs-learning-quote { padding-left: 20px; }
}

/* ================================================================
   DROOMWORK — HYPOTHESIS BLOCK
   ================================================================ */
.cs-hypothesis {
  margin-top: 40px;
  border-left: 2px solid rgba(0,0,0,0.15);
  padding-left: 28px;
}

.cs-hypothesis__body {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.cs-hypothesis__assumption {
  font-weight: 500;
}

/* ================================================================
   DROOMWORK — STRATEGIC SHIFT BLOCK
   ================================================================ */
.cs-shift-block {
  margin-top: 40px;
}

.cs-shift-block__inner {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-top: 20px;
  flex-wrap: wrap;
}

.cs-shift-block__from,
.cs-shift-block__to {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 28px;
  border: 1px solid rgba(0,0,0,0.1);
  border-radius: 4px;
  flex: 1;
  min-width: 180px;
}

.cs-shift-block__from {
  background: rgba(0,0,0,0.03);
  color: rgba(0,0,0,0.45);
}

.cs-shift-block__to {
  background: #1a1a1a;
  color: #fff;
}

.cs-shift-block__symbol {
  font-size: 18px;
  font-weight: 700;
  flex-shrink: 0;
}

.cs-shift-block__from .cs-shift-block__symbol { color: #c0392b; }
.cs-shift-block__to .cs-shift-block__symbol { color: #2ecc71; }

.cs-shift-block__arrow {
  font-size: 24px;
  font-weight: 300;
  color: rgba(0,0,0,0.3);
  flex-shrink: 0;
}

@media (max-width: 600px) {
  .cs-shift-block__inner { flex-direction: column; }
  .cs-shift-block__arrow { transform: rotate(90deg); }
}