:root {
  --ink: #182a34;
  --brand-dark: #223645;
  --brand-purple: #5f4e9f;
  --brand-warm: #d2a98e;
  --surface: #f6f2ed;
  --panel: #ffffff;
  --line: rgba(34, 54, 69, 0.16);
  --muted: #65737b;
  --green: #4f8c72;
  --section-y: 60px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  font-family: "IBM Plex Sans", Arial, sans-serif;
  line-height: 1.55;
}

a {
  color: inherit;
  text-decoration: none;
}

.shell {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.topbar,
.footer {
  color: #fff;
  background: linear-gradient(135deg, #14252f, #223645 55%, #5f4e9f);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

/* Hash anchors (#karbon-ayak-izi vb.) sticky header altında kalmaması için */
section[id],
[id].anchor-target {
  scroll-margin-top: 96px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 78px;
}

.nav > a:first-child {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
}

.logo {
  display: block;
  width: auto;
  height: 40px;
  max-width: min(162px, 44vw);
  aspect-ratio: 388 / 96;
  object-fit: contain;
  object-position: left center;
  flex: 0 0 auto;
}

.nav-links,
.footer-links,
.quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 9px 10px;
  align-items: center;
}

.nav-links a,
.footer-links a,
.quick-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
  transition:
    color 160ms ease,
    border-color 160ms ease,
    background-color 160ms ease;
}

.nav-links a:hover,
.footer-links a:hover,
.quick-links a:hover {
  border-color: rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.07);
  color: #fff;
}

.nav-links .nav-data-link {
  border-color: rgba(210, 169, 142, 0.34);
  background: rgba(210, 169, 142, 0.1);
  color: #fff;
}

@media (max-width: 760px) {
  .shell {
    width: min(100% - 28px, 1120px);
  }

  .nav {
    gap: 10px;
    min-height: auto;
    padding: 9px 0;
  }

  .logo {
    height: 34px;
    max-width: 138px;
  }

  .nav-links {
    flex: 1 1 0;
    flex-wrap: nowrap;
    justify-content: flex-start;
    gap: 6px;
    max-width: calc(100% - 68px);
    min-width: 0;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;
  }

  .nav-links::-webkit-scrollbar {
    display: none;
  }

  .nav-links a {
    flex: 0 0 auto;
    min-height: 44px;
    padding: 6px 9px;
    font-size: 12px;
  }
}

.hero {
  min-height: 600px;
  padding: 104px 0 78px;
  color: #fff;
  background:
    linear-gradient(90deg, rgba(24, 42, 52, 0.94), rgba(34, 54, 69, 0.72), rgba(95, 78, 159, 0.36)),
    var(--hero-image, url("hero-integrated-environmental-campus.webp"));
  background-position: center;
  background-size: cover;
}

.eyebrow,
.kicker {
  color: var(--brand-warm);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 900px;
  margin: 14px 0 18px;
  font-family: "IBM Plex Serif", Georgia, serif;
  font-size: clamp(36px, 5.4vw, 68px);
  line-height: 1.05;
  letter-spacing: 0;
}

.hero p {
  max-width: 760px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 19px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.hero-mini-note {
  max-width: 820px;
  margin: 16px 0 0;
  color: rgba(255, 255, 255, 0.74);
  font-size: 15px;
  font-weight: 650;
}

.hero-mini-note a {
  color: #fff;
  border-bottom: 1px solid rgba(210, 169, 142, 0.72);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  font-weight: 800;
}

.button.primary {
  color: #182a34;
  background: var(--brand-warm);
  border: 1px solid rgba(210, 169, 142, 0.45);
  box-shadow: 0 12px 30px rgba(210, 169, 142, 0.28);
}

.button.secondary {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

section {
  padding: var(--section-y) 0;
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(280px, 0.5fr);
  gap: 34px;
  align-items: end;
  margin-bottom: 30px;
}

h2 {
  margin: 8px 0 0;
  font-family: "IBM Plex Serif", Georgia, serif;
  font-size: clamp(30px, 3.6vw, 48px);
  line-height: 1.08;
  letter-spacing: 0;
}

.section-head p,
.muted {
  color: var(--muted);
}

.answer-box {
  margin-top: 28px;
  padding: 24px;
  border: 1px solid rgba(95, 78, 159, 0.22);
  border-left: 4px solid var(--brand-warm);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  box-shadow: 0 18px 54px rgba(34, 54, 69, 0.08);
  font-size: 18px;
  font-weight: 650;
}

.grid,
.faq-grid,
.link-grid {
  display: grid;
  gap: 12px;
  align-items: stretch;
}

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

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

.card,
.faq,
.step,
.link-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.card,
.faq,
.link-card {
  padding: 22px;
  min-height: 100%;
}

.card {
  min-height: 188px;
}

.faq,
.link-card {
  min-height: 154px;
}

.link-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.solution-system {
  display: grid;
  gap: 18px;
}

.solution-category {
  padding: 24px;
  border: 1px solid rgba(34, 54, 69, 0.12);
  border-radius: 10px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.94), rgba(246, 242, 237, 0.7)),
    #fff;
  box-shadow: 0 18px 54px rgba(34, 54, 69, 0.07);
}

.solution-category-head {
  display: grid;
  grid-template-columns: minmax(0, 0.72fr) minmax(260px, 0.42fr);
  gap: 24px;
  align-items: end;
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(34, 54, 69, 0.1);
}

.solution-category-head h3 {
  margin: 8px 0 0;
  font-family: "IBM Plex Serif", Georgia, serif;
  font-size: clamp(24px, 2.6vw, 34px);
  line-height: 1.08;
}

.solution-category-head p {
  margin: 0;
  color: var(--muted);
  font-weight: 650;
}

.solution-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.solution-card {
  position: relative;
  display: grid;
  gap: 9px;
  min-height: 168px;
  padding: 18px;
  overflow: hidden;
  border: 1px solid rgba(34, 54, 69, 0.12);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.86);
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease,
    transform 160ms ease;
}

.solution-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: linear-gradient(180deg, var(--brand-warm), var(--brand-purple));
  opacity: 0.82;
}

.solution-card:hover,
.solution-card:focus-visible {
  border-color: rgba(95, 78, 159, 0.28);
  box-shadow: 0 18px 44px rgba(34, 54, 69, 0.1);
  transform: translateY(-2px);
}

.solution-card small {
  color: var(--brand-purple);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.solution-card strong {
  color: var(--ink);
  font-size: 18px;
  line-height: 1.18;
}

.solution-card span {
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
  line-height: 1.42;
}

.solution-card.is-flagship {
  color: #fff;
  border-color: rgba(210, 169, 142, 0.28);
  background:
    linear-gradient(135deg, rgba(34, 54, 69, 0.98), rgba(72, 61, 130, 0.94));
}

.solution-card.is-flagship small,
.solution-card.is-flagship strong,
.solution-card.is-flagship span {
  color: #fff;
}

.solution-card.is-flagship span {
  color: rgba(255, 255, 255, 0.76);
}

.decision-map-section {
  padding-top: 0;
  background:
    radial-gradient(circle at 12% 10%, rgba(210, 169, 142, 0.12), transparent 26%),
    linear-gradient(135deg, rgba(255, 255, 255, 0.94), rgba(246, 242, 237, 0.88));
}

.decision-map {
  display: grid;
  grid-template-columns: minmax(260px, 0.35fr) minmax(0, 0.65fr);
  gap: 18px;
  padding: 24px;
  border: 1px solid rgba(34, 54, 69, 0.13);
  border-radius: 10px;
  background:
    linear-gradient(135deg, rgba(34, 54, 69, 0.96), rgba(57, 69, 112, 0.94) 54%, rgba(95, 78, 159, 0.92)),
    var(--brand-dark);
  box-shadow: 0 24px 70px rgba(34, 54, 69, 0.18);
}

.decision-map-copy {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 18px;
  min-height: 100%;
  padding: 6px 8px 6px 0;
  color: #fff;
}

.decision-map-copy .kicker {
  color: var(--brand-warm);
}

.decision-map-copy h2 {
  margin: 8px 0 0;
  color: #fff;
  font-family: "IBM Plex Serif", Georgia, serif;
  font-size: clamp(28px, 3.2vw, 44px);
  line-height: 1.04;
}

.decision-map-copy p {
  margin: 14px 0 0;
  color: rgba(255, 255, 255, 0.74);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.56;
}

.decision-map-note {
  display: grid;
  gap: 8px;
  padding: 16px;
  border: 1px solid rgba(210, 169, 142, 0.24);
  border-left: 4px solid var(--brand-warm);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
}

.decision-map-note strong {
  color: #fff;
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.decision-map-note span {
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
  font-weight: 650;
  line-height: 1.44;
}

.decision-route-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.decision-route {
  position: relative;
  display: grid;
  align-content: start;
  gap: 8px;
  min-height: 164px;
  padding: 16px 16px 16px 18px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.075);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  transition:
    border-color 160ms ease,
    background 160ms ease,
    transform 160ms ease;
}

.decision-route::before {
  content: "";
  position: absolute;
  inset: 14px auto 14px 0;
  width: 3px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--brand-warm), rgba(255, 255, 255, 0.24));
}

.decision-route:hover,
.decision-route:focus-visible {
  border-color: rgba(210, 169, 142, 0.34);
  background: rgba(255, 255, 255, 0.11);
  transform: translateY(-2px);
}

.decision-route small {
  color: var(--brand-warm);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.decision-route strong {
  color: #fff;
  font-size: 16px;
  line-height: 1.18;
}

.decision-route span {
  color: rgba(255, 255, 255, 0.68);
  font-size: 13px;
  font-weight: 650;
  line-height: 1.38;
}

.decision-output-section {
  padding-top: 0;
  background: linear-gradient(180deg, rgba(246, 242, 237, 0.92), #fff);
}

.decision-output-panel {
  padding: 26px;
  border: 1px solid rgba(34, 54, 69, 0.12);
  border-radius: 10px;
  background:
    radial-gradient(circle at 100% 0%, rgba(210, 169, 142, 0.15), transparent 30%),
    linear-gradient(135deg, #fff, rgba(246, 242, 237, 0.78));
  box-shadow: 0 22px 64px rgba(34, 54, 69, 0.08);
}

.decision-output-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
  margin-top: 20px;
}

.decision-output-card {
  display: grid;
  align-content: start;
  gap: 8px;
  min-height: 150px;
  padding: 16px;
  border: 1px solid rgba(34, 54, 69, 0.12);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.82);
}

.decision-output-card small {
  color: var(--brand-purple);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.decision-output-card strong {
  color: var(--ink);
  font-size: 16px;
  line-height: 1.2;
}

.decision-output-card span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
  line-height: 1.4;
}

.card h3,
.faq h3,
.link-card strong {
  display: block;
  margin: 0 0 8px;
  font-size: 18px;
}

.card p,
.faq p,
.link-card span {
  display: block;
  margin: 0;
  color: var(--muted);
}

.comparison-panel {
  padding: 26px;
  border: 1px solid rgba(95, 78, 159, 0.2);
  border-radius: 10px;
  background:
    radial-gradient(circle at 94% 10%, rgba(210, 169, 142, 0.18), transparent 28%),
    linear-gradient(135deg, #fff, rgba(246, 242, 237, 0.72));
  box-shadow: 0 22px 64px rgba(34, 54, 69, 0.08);
}

.comparison-panel .answer-box {
  margin-top: 0;
}

.comparison-table {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.comparison-row {
  display: grid;
  grid-template-columns: minmax(170px, 0.45fr) minmax(0, 0.72fr) minmax(0, 0.82fr);
  gap: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.86);
}

.comparison-row.header {
  color: #fff;
  background: var(--brand-dark);
}

.comparison-row > span {
  padding: 15px 16px;
  border-right: 1px solid rgba(34, 54, 69, 0.12);
}

.comparison-row > span:last-child {
  border-right: 0;
}

.comparison-row.header > span {
  border-color: rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.82);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.comparison-row strong {
  display: block;
  color: var(--ink);
  line-height: 1.18;
}

.comparison-row.header strong {
  color: #fff;
}

.comparison-row small {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.42;
}

.comparison-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 18px;
  padding: 18px 20px;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, var(--brand-dark), var(--brand-purple));
}

.comparison-cta p {
  max-width: 680px;
  margin: 0;
  color: rgba(255, 255, 255, 0.76);
}

.comparison-cta .button.primary {
  color: #182a34;
  background: var(--brand-warm);
  border: 1px solid rgba(210, 169, 142, 0.45);
}

.process {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  align-items: stretch;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.14);
}

.dark {
  color: #fff;
  background: var(--brand-dark);
}

.dark .section-head p,
.dark .step p {
  color: rgba(255, 255, 255, 0.7);
}

.step {
  min-height: 200px;
  padding: 22px;
  background: rgba(255, 255, 255, 0.07);
}

.step b {
  color: var(--brand-warm);
}

.step h3 {
  margin: 44px 0 8px;
  font-size: 18px;
}

.split {
  display: grid;
  grid-template-columns: 0.8fr 1fr;
  gap: 18px;
  align-items: start;
}

.note {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(180deg, rgba(95, 78, 159, 0.08), #fff);
}

.checklist {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.checklist li {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.answer-library {
  padding: 26px;
  border: 1px solid rgba(95, 78, 159, 0.18);
  border-radius: 10px;
  background:
    radial-gradient(circle at 96% 0%, rgba(210, 169, 142, 0.16), transparent 34%),
    linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(246, 242, 237, 0.78));
  box-shadow: 0 22px 60px rgba(34, 54, 69, 0.08);
}

.answer-library .section-head {
  margin-bottom: 18px;
}

.answer-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  align-items: stretch;
}

.answer-card {
  display: grid;
  gap: 12px;
  min-height: 300px;
  padding: 18px;
  border: 1px solid rgba(34, 54, 69, 0.13);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.88);
}

.answer-card small {
  color: var(--brand-purple);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.answer-card h3 {
  margin: 0;
  font-size: 18px;
  line-height: 1.16;
}

.answer-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.48;
}

.answer-card .direct-answer {
  color: var(--ink);
  font-size: 14px;
  font-weight: 650;
}

.answer-card .answer-role {
  padding-top: 10px;
  border-top: 1px dashed rgba(34, 54, 69, 0.14);
}

.answer-card .answer-role strong {
  color: var(--ink);
}

.answer-card .answer-source {
  align-self: end;
  padding-top: 10px;
  border-top: 1px solid rgba(34, 54, 69, 0.1);
  color: rgba(34, 54, 69, 0.56);
  font-size: 11px;
  font-weight: 800;
}

.answer-card .answer-source a {
  color: var(--brand-purple);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.answer-freshness {
  margin: 14px 0 0;
  color: rgba(34, 54, 69, 0.52);
  font-size: 12px;
  font-weight: 800;
}

.related {
  background: #fff;
}

.footer {
  padding: 42px 0 30px;
}

.footer-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 34px;
}

.footer p {
  max-width: 520px;
  color: rgba(255, 255, 255, 0.72);
}

.footer-meta {
  margin-top: 22px;
  color: rgba(255, 255, 255, 0.62);
  font-size: 13px;
}

.footer-directory {
  grid-column: 1 / -1;
  display: grid;
  gap: 20px;
  margin-top: 8px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}

.footer-directory-head {
  display: grid;
  grid-template-columns: minmax(0, 0.72fr) minmax(240px, 0.42fr);
  gap: 24px;
  align-items: end;
}

.footer-directory-head strong {
  display: block;
  color: #fff;
  font-family: "IBM Plex Serif", Georgia, serif;
  font-size: clamp(24px, 2.8vw, 36px);
  line-height: 1.08;
}

.footer-directory-head p {
  margin: 0;
  max-width: none;
  color: rgba(255, 255, 255, 0.68);
  font-weight: 650;
}

.footer-directory-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1fr;
  gap: 12px;
}

.footer-directory-group {
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.045);
}

.footer-directory-group h3 {
  margin: 0 0 10px;
  color: var(--brand-warm);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.footer-directory-group a {
  display: block;
  padding: 7px 0;
  color: rgba(255, 255, 255, 0.76);
  font-size: 13px;
  font-weight: 750;
  line-height: 1.26;
}

.footer-directory-group a:hover,
.footer-directory-group a:focus-visible {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (max-width: 900px) {
  :root {
    --section-y: 48px;
  }

  .section-head,
  .solution-category-head,
  .decision-map,
  .grid,
  .faq-grid,
  .link-grid,
  .solution-card-grid,
  .decision-route-grid,
  .decision-output-grid,
  .answer-grid,
  .comparison-row,
  .process,
  .split,
  .footer-layout,
  .footer-directory-head,
  .footer-directory-grid {
    grid-template-columns: 1fr;
  }

  .comparison-row > span {
    border-right: 0;
    border-bottom: 1px solid rgba(34, 54, 69, 0.1);
  }

  .comparison-row > span:last-child {
    border-bottom: 0;
  }

  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 0;
  }

  section[id],
  [id].anchor-target {
    scroll-margin-top: 132px;
  }

  .hero {
    padding-top: 70px;
    min-height: 520px;
  }

  .decision-map {
    padding: 18px;
  }

  .decision-map-copy {
    padding: 0;
  }

  .decision-route {
    min-height: 0;
  }

  .card,
  .faq,
  .link-card,
  .answer-card,
  .step {
    min-height: auto;
  }
}

@media (max-width: 620px) {
  .shell {
    width: min(100% - 28px, 1120px);
  }

  .hero h1 {
    font-size: 36px;
  }

  .nav-links {
    gap: 8px;
  }

  .nav-links a {
    min-height: 30px;
    padding: 6px 8px;
    font-size: 13px;
  }

}

@media (max-width: 420px) {
  .nav-links .nav-data-link {
    display: none;
  }
}