@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap");

:root {
  --ink: #101412;
  --muted: #52605b;
  --soft: #eef7f0;
  --soft-2: #f7fbf8;
  --line: rgba(17, 24, 39, 0.12);
  --green: #70b84a;
  --green-dark: #3f8e2f;
  --teal: #118f85;
  --shadow: 0 28px 80px rgba(21, 44, 37, 0.12);
  --radius-xl: 32px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 20% 5%, rgba(112, 184, 74, 0.18), transparent 34rem),
    radial-gradient(circle at 88% 10%, rgba(17, 143, 133, 0.14), transparent 38rem),
    linear-gradient(180deg, #ffffff 0%, #f8fbf8 42%, #eef6ef 100%);
  overflow-x: hidden;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 20px;
  font-size: clamp(3.2rem, 6.2vw, 6.8rem);
  line-height: 0.92;
  letter-spacing: -0.065em;
}

h2 {
  font-size: clamp(1.85rem, 3.2vw, 3.65rem);
  line-height: 1.03;
  letter-spacing: -0.045em;
}

h3 {
  margin-bottom: 5px;
  font-size: clamp(1.6rem, 2.4vw, 2.6rem);
  line-height: 1;
  letter-spacing: -0.04em;
}

figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: #fff;
  box-shadow: 0 14px 44px rgba(21, 44, 37, 0.08);
}

figure img {
  width: 100%;
  aspect-ratio: 1 / 0.88;
  object-fit: cover;
  object-position: top center;
  background: #fff;
}

figcaption {
  padding: 18px 20px 22px;
  color: var(--muted);
  line-height: 1.55;
}

figcaption strong {
  color: var(--ink);
}

blockquote {
  margin: 38px 0 0;
  padding: clamp(26px, 4vw, 44px);
  border-left: 7px solid var(--teal);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.74);
  color: var(--ink);
  font-size: clamp(1.7rem, 3vw, 3rem);
  line-height: 1.05;
  letter-spacing: -0.05em;
  font-weight: 900;
}

/* Shared layout */
.eyebrow {
  margin: 0 0 14px;
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.lede {
  max-width: 760px;
  color: var(--muted);
  font-size: clamp(0.9rem, 1.35vw, 1rem);
  line-height: 1.45;
}

.panel-inner {
  width: min(1280px, calc(100% - 40px));
  margin: 0 auto;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.78);
  box-shadow: var(--shadow);
}

.split {
  display: grid;
  grid-template-columns: minmax(200px, 0.95fr) minmax(320px, 1.05fr);
  gap: clamp(25px, 7vw, 70px);
}

/* Skip link and progress */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  transform: translateY(-150%);
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--ink);
  color: #fff;
  text-decoration: none;
}

.skip-link:focus {
  transform: translateY(0);
}

.scroll-progress {
  position: fixed;
  inset: 0 0 auto;
  height: 4px;
  z-index: 99;
  background: rgba(16, 20, 18, 0.08);
}

.scroll-progress span {
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--teal), var(--green));
}

/* Header navigation */
.top-nav {
  position: fixed;
  top: 18px;
  left: 50%;
  z-index: 40;
  display: flex;
  gap: 6px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(16px);
  transform: translateX(-50%);
  box-shadow: 0 10px 35px rgba(18, 52, 44, 0.09);
}

.top-nav a {
  padding: 9px 13px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
  text-decoration: none;
}

.top-nav a:hover,
.top-nav a.is-active {
  background: var(--ink);
  color: #fff;
}

/* Hero */
.hero {
  min-height: 100vh;
  padding: 96px clamp(20px, 4vw, 72px) 64px;
}

.hero-grid {
  width: min(1440px, 100%);
  min-height: calc(100vh - 176px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(320px, 0.86fr) minmax(520px, 1.14fr);
  gap: clamp(32px, 5vw, 76px);
  align-items: center;
}

.dek {
  max-width: 760px;
  margin-bottom: 20px;
  color: #26302d;
  font-size: clamp(1.35rem, 2.1vw, 2.1rem);
  line-height: 1.18;
  font-weight: 700;
  letter-spacing: -0.035em;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 999px;
  font-weight: 850;
  text-decoration: none;
}

.button-dark {
  background: var(--ink);
  color: #fff;
  box-shadow: 0 18px 45px rgba(16, 20, 18, 0.22);
}

.button-ghost {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.68);
}

.hero-visual {
  position: relative;
  min-height: 520px;
  overflow: hidden;
  border: 1px solid rgba(16, 20, 18, 0.08);
  border-radius: 44px;
  background: #fff;
  box-shadow: var(--shadow);
  isolation: isolate;
}

.hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.1), transparent 20%, transparent 72%, rgba(255, 255, 255, 0.7)),
    radial-gradient(circle at 72% 52%, rgba(112, 184, 74, 0.16), transparent 17rem);
}

.hero-visual img {
  width: 100%;
  height: 100%;
  min-height: 520px;
  object-fit: cover;
  object-position: center;
  transform: scale(1.02);
}

/* Problem */
.question-panel {
  padding: 20px 0;
}

.question-panel .panel-inner {
  background: rgba(255, 255, 255, 0.72);
}

.panel-copy p,
.chapter-copy p,
.sticky-copy p,
.future-card p {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.45;
  padding: 10px;
}

.why-cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 5px;
}

.why-card {
  min-height: 126px;
  display: grid;
  align-content: start;
  gap: 12px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 26px;
  background: linear-gradient(180deg, #fff, rgba(232, 246, 230, 0.48));
}

.why-card strong {
  color: var(--teal);
  font-size: 1.05rem;
  font-weight: 950;
}

.why-card span {
  color: var(--muted);
  line-height: 1.6;
}

/* Method chapters */
.chapter {
  width: min(1280px, calc(100% - 40px));
  min-height: 20vh;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(310px, 0.92fr) minmax(420px, 1.08fr);
  gap: 28px;
  align-items: center;
  padding: 30px 0;
}

.chapter-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--teal), var(--green));
  color: #fff;
  font-weight: 950;
  font-size: 1.05rem;
  box-shadow: 0 20px 44px rgba(35, 128, 103, 0.22);
}

.chapter-visual,
.wide-visual-chapter {
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.76);
  box-shadow: var(--shadow);
  overflow: hidden;
  padding: 18px;
}

.wide-visual-chapter {
  grid-column: 1 / -1;
  width: 100%;
}

/* 01 Measurement */
.dual-system-card {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  align-items: center;
  margin-top: 50px;
}

.system-card {
  min-height: 340px;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 18px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 26px;
  background: linear-gradient(180deg, #fff, rgba(232, 246, 230, 0.52));
  text-align: center;
}

.system-card svg {
  width: 100%;
  max-width: 250px;
}

.system-card .erp-svg {
  max-width: 320px;
  overflow: visible;
}

.system-card path {
  fill: none;
  stroke: var(--teal);
  stroke-width: 8;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
}

.system-card small {
  max-width: 220px;
  color: var(--muted);
  line-height: 1.5;
}

.system-label {
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.erp-svg text {
  fill: var(--muted);
  font-size: 15px;
  font-weight: 850;
}

.erp-base {
  stroke: rgba(16, 20, 18, 0.28);
  stroke-width: 2.5;
}

.erp-guide {
  stroke: rgba(16, 20, 18, 0.18);
  stroke-width: 2;
  stroke-dasharray: 6 7;
}

.erp-guide.target {
  stroke: rgba(17, 143, 133, 0.38);
}

.erp-wave {
  fill: none;
  stroke: var(--teal);
  stroke-width: 7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.pupil-icon {
  width: 146px;
  height: 146px;
  display: grid;
  place-items: center;
  border: 6px solid var(--ink);
  border-radius: 50% 50% 45% 45%;
  background: radial-gradient(circle, #fff 0 24%, #dff3f1 25% 58%, #fff 59%);
}

.pupil-icon i {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #020504;
  animation: pupilPulse 2.8s infinite ease-in-out;
}

/* 02 Task */
.ant-panel {
  display: grid;
  align-content: center;
  gap: 18px;
  overflow: visible;
}

.ant-flow {
  display: grid;
  align-items: center;
  gap: 8px;
  grid-template-columns: 1fr 0.25fr 2.75fr 0.25fr 2fr 0.25fr 1fr;
}

.ant-stage {
  min-height: 100px;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: linear-gradient(180deg, #fff, #f7fbf8);
  text-align: center;
}

.ant-stage strong {
  color: var(--ink);
  font-size: 2rem;
  line-height: 1;
  letter-spacing: -0.05em;
}

.ant-stage span {
  color: var(--muted);
  font-weight: 400;
}

.ant-arrow {
  height: 4px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--teal), var(--green));
  position: relative;
}

.ant-arrow::after {
  content: "";
  position: absolute;
  right: -2px;
  top: 50%;
  width: 12px;
  height: 12px;
  border-top: 4px solid var(--green);
  border-right: 4px solid var(--green);
  transform: translateY(-50%) rotate(45deg);
}

.ant-networks {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.ant-networks div {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.78);
}

.ant-networks b {
  display: block;
  margin-bottom: 6px;
  color: var(--teal);
  font-weight: 950;
}

.ant-networks span {
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.45;
}

/* 03 Cohorts */
.cohort-grid {
  display: grid;
  grid-template-columns: minmax(140px, 0.85fr) minmax(140px, 0.85fr) minmax(220px, 1.15fr) minmax(420px, 2.2fr);
  gap: 16px;
  align-items: stretch;
}

.stat-card {
  min-height: 150px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(18px, 2vw, 28px);
  border: 1px solid var(--line);
  border-radius: 26px;
  background: linear-gradient(180deg, #fff, rgba(232, 246, 230, 0.42));
}

.stat-card strong {
  color: var(--teal);
  font-size: clamp(3rem, 5.8vw, 5.8rem);
  line-height: 0.9;
  letter-spacing: -0.08em;
}

.stat-card span {
  margin-top: 12px;
  color: var(--muted);
  font-size: clamp(0.82rem, 1.1vw, 1rem);
  font-weight: 800;
  line-height: 1.35;
}

.stat-card-figure {
  justify-content: center;
  padding: clamp(12px, 1.6vw, 12px);
  box-shadow: none;
}

.stat-card-figure img,
.gcs-figure.severity-card img {
  width: 100%;
  height: 100%;
  max-height: 280px;
  aspect-ratio: auto;
  object-fit: contain;
  object-position: center;
}

.gcs-figure.severity-card {
  min-height: 280px;
  background: linear-gradient(180deg, #fff, rgba(232, 246, 230, 0.42));
}

/* 04 Behavioral result */
.behavior-panel,
.figure-focus-panel,
.processing-panel {
  display: grid;
  align-items: center;
  overflow: visible;
  padding: 15px;
  margin-top: 100px;
}

.behavior-panel {
  padding: clamp(8px, 1.4vw, 18px);
}

.behavior-panel > img {
  width: min(100%, 1380px);
  transform: scale(1.04);
  transform-origin: center;
}

/* 05 Data processing and 06 Key discovery */
.full-figure,
.tight-card,
.supp-figure,
.gcs-figure {
  overflow: hidden;
}

.full-figure img,
.tight-card img,
.supp-figure img,
.behavior-panel > img,
.figure-focus-panel img,
.processing-panel img,
.gallery-grid figure img,
.gcs-figure img {
  width: 100%;
  height: auto;
  max-height: none;
  aspect-ratio: auto;
  object-fit: contain;
  object-position: top center;
}

/* Proposed interpretation */
.mechanism {
  padding: 18px;
  background:
    radial-gradient(circle at 10% 20%, rgba(112, 184, 74, 0.16), transparent 28rem),
    radial-gradient(circle at 80% 55%, rgba(17, 143, 133, 0.12), transparent 32rem);
}

.mechanism .panel-inner {
  padding: 25px;
}

.sticky-copy {
  position: flex;
  top: 110px;
  align-self: start;
}

.mechanism-visual {
  margin-top: 50px;
  margin-bottom: 80px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: #fff;
  box-shadow: var(--shadow);
}

.mechanism-visual img {
  width: 100%;
  display: flex;
  align-items: center;
  padding: 18px;
}

/* Significance */
.section-head .eyebrow {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.45;
  /*padding: 10px;*/
}


.future {
  padding: clamp(42px, 6.5vw, 84px) clamp(20px, 4vw, 72px);
}

.section-head.compact {
  display: grid;
  grid-template-columns: minmax(280px, 0.95fr) minmax(320px, 1.05fr);
  gap: clamp(24px, 5vw, 70px);
  align-items: start;
  padding: 25px;
}

.future-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.future-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 26px;
  background: rgba(255, 255, 255, 0.76);
  box-shadow: 0 15px 48px rgba(21, 44, 37, 0.08);
}

.future-card span {
  display: inline-flex;
  margin-bottom: 12px;
  color: var(--teal);
  font-weight: 950;
}

/* Additional figures */
.figure-gallery {
  padding: clamp(42px, 6.5vw, 84px) clamp(20px, 4vw, 72px);
  background: #fff;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px;
}

/* Back to top and footer */
.back-to-top-wrap {
  display: flex;
  justify-content: center;
  padding: clamp(24px, 4vw, 48px) clamp(20px, 4vw, 72px) clamp(42px, 6vw, 72px);
}

.back-to-top {
  min-width: 150px;
}

.footer {
  padding: 38px clamp(20px, 4vw, 72px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  background: #fff;
  text-align: center;
}

.footer p {
  max-width: 900px;
  margin: 0 auto;
  line-height: 1.55;
}

/* Animation */
.reveal,
.reveal-on-load {
  opacity: 0;
  transform: translateY(26px);
}

.reveal-on-load {
  animation: revealIn 0.9s 0.15s ease forwards;
}

.reveal-on-load:nth-child(2) {
  animation-delay: 0.32s;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.85s ease, transform 0.85s ease;
}

.reveal.is-visible .system-card path {
  animation: drawTrace 1.6s 0.2s cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
}

@keyframes revealIn {
  from { opacity: 0; transform: translateY(26px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes drawTrace {
  to { stroke-dashoffset: 0; }
}

@keyframes pupilPulse {
  0%, 100% { transform: scale(0.72); }
  45% { transform: scale(1.18); }
}

/* Responsive */
@media (max-width: 1080px) {
  .hero-grid,
  .chapter,
  .split,
  .section-head.compact {
    grid-template-columns: 1fr;
  }

  .cohort-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .stat-card-figure {
    grid-column: span 2;
  }

  .ant-flow {
    grid-template-columns: 1fr;
  }

  .ant-arrow {
    width: 4px;
    height: 28px;
    justify-self: center;
  }

  .ant-arrow::after {
    right: auto;
    top: auto;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%) rotate(135deg);
  }

  .future-grid,
  .why-cards,
  .gallery-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .hero {
    padding-top: 86px;
  }

  .hero-grid,
  .chapter,
  .panel-inner {
    width: min(100% - 28px, 1280px);
  }

  .hero-visual,
  .hero-visual img {
    min-height: 340px;
  }

  .dual-system-card,
  .cohort-grid,
  .ant-networks {
    grid-template-columns: 1fr;
  }

  .stat-card-figure {
    grid-column: auto;
  }

  .stat-card {
    min-height: 170px;
  }

  .top-nav {
    width: calc(100% - 28px);
    justify-content: center;
  }
}