:root {
  --ink: #132a35;
  --ink-soft: #52656d;
  --paper: #f5f0e5;
  --paper-bright: #fffdf7;
  --line: rgba(19, 42, 53, 0.17);
  --orange: #df5a36;
  --orange-dark: #a9361d;
  --aqua: #9fd6cd;
  --blue: #1c5d78;
  --shadow: 0 22px 70px rgba(19, 42, 53, 0.11);
  --radius-lg: 28px;
  --radius-md: 18px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(19, 42, 53, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(19, 42, 53, 0.035) 1px, transparent 1px),
    var(--paper);
  background-size: 32px 32px;
  font-family: "DM Sans", "Segoe UI", sans-serif;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 20;
  padding: 0.75rem 1rem;
  background: var(--ink);
  color: white;
  border-radius: 999px;
  transform: translateY(-180%);
}

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

.site-header,
main,
.site-footer {
  width: min(1180px, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  padding: 1.2rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  font-family: "Instrument Serif", Georgia, serif;
  font-size: 1.2rem;
  font-style: italic;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 0.95rem;
}

.brand small {
  margin-top: 0.08rem;
  color: var(--ink-soft);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.site-nav a {
  padding: 0.65rem 0.85rem;
  border-radius: 999px;
  color: var(--ink-soft);
  font-size: 0.88rem;
  font-weight: 700;
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.52);
}

.site-nav .nav-directory {
  margin-left: 0.4rem;
  color: var(--paper-bright);
  background: var(--ink);
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
  min-height: 590px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 38px;
  background:
    radial-gradient(circle at 18% 12%, rgba(159, 214, 205, 0.22), transparent 34%),
    var(--ink);
  color: var(--paper-bright);
  box-shadow: var(--shadow);
}

.hero-copy {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(2rem, 6vw, 5.3rem);
}

.kicker {
  margin: 0 0 0.85rem;
  color: var(--orange);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.hero .kicker {
  color: var(--aqua);
}

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

h1,
h2,
h3 {
  text-wrap: balance;
}

h1 {
  max-width: 9ch;
  margin-bottom: 1.4rem;
  font-family: "Instrument Serif", Georgia, serif;
  font-size: clamp(4rem, 7.8vw, 7.3rem);
  font-weight: 400;
  letter-spacing: -0.055em;
  line-height: 0.84;
}

h1 em {
  color: var(--aqua);
  font-weight: 400;
}

.hero-intro {
  max-width: 37rem;
  margin-bottom: 0;
  color: rgba(255, 253, 247, 0.78);
  font-size: clamp(1rem, 1.8vw, 1.16rem);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.8rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.75rem 1rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
}

.button-primary {
  color: var(--ink);
  background: var(--paper-bright);
}

.button-secondary {
  border-color: rgba(255, 255, 255, 0.25);
  color: var(--paper-bright);
}

.button:hover,
.launch-link:hover {
  transform: translateY(-2px);
}

.button,
.launch-link {
  transition: transform 150ms ease, background-color 150ms ease;
}

.hero-visual {
  position: relative;
  min-height: 460px;
  margin: 3rem 3rem 3rem 0;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 28px;
  background:
    linear-gradient(rgba(255, 255, 255, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.055) 1px, transparent 1px),
    rgba(255, 255, 255, 0.035);
  background-size: 30px 30px;
}

.hero-visual svg {
  position: absolute;
  inset: 10% 3% auto;
  width: 94%;
  height: 78%;
}

.feasible {
  fill: rgba(159, 214, 205, 0.14);
  stroke: var(--aqua);
  stroke-width: 2;
}

.curve {
  fill: none;
  stroke: rgba(255, 253, 247, 0.83);
  stroke-width: 3;
}

.area {
  fill: url(#area-fill);
}

.objective {
  stroke: var(--orange);
  stroke-width: 4;
}

.point {
  fill: var(--paper-bright);
  stroke: var(--ink);
  stroke-width: 3;
}

.visual-note {
  position: absolute;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.55rem 0.7rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  background: rgba(19, 42, 53, 0.82);
  color: rgba(255, 253, 247, 0.82);
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  backdrop-filter: blur(12px);
}

.visual-note span {
  color: var(--aqua);
}

.note-one {
  top: 9%;
  left: 8%;
}

.note-two {
  top: 47%;
  right: 5%;
}

.note-three {
  bottom: 7%;
  left: 16%;
}

.catalog-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.6fr);
  gap: 3rem;
  align-items: end;
  padding: 7rem 0 3.5rem;
}

.catalog-intro h2,
.discipline h2,
.use-guide h2 {
  margin-bottom: 0;
  font-family: "Instrument Serif", Georgia, serif;
  font-size: clamp(2.8rem, 5vw, 5.2rem);
  font-weight: 400;
  letter-spacing: -0.045em;
  line-height: 0.95;
}

.catalog-intro > p,
.discipline-header > p {
  margin-bottom: 0;
  color: var(--ink-soft);
  line-height: 1.75;
}

.discipline {
  padding: 4rem 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 1rem;
}

.discipline-header {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr) minmax(250px, 0.45fr);
  gap: 1.5rem;
  align-items: center;
  margin-bottom: 2.3rem;
}

.discipline-number {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  font-family: "Instrument Serif", Georgia, serif;
  font-size: 1.5rem;
  font-style: italic;
}

.discipline-header h2 {
  font-size: clamp(2.4rem, 4vw, 4rem);
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.tool-grid-single {
  grid-template-columns: 1fr;
}

.tool-card {
  display: flex;
  flex-direction: column;
  min-height: 390px;
  padding: 1.35rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 253, 247, 0.78);
  box-shadow: 0 10px 35px rgba(19, 42, 53, 0.055);
}

.tool-card-featured {
  min-height: 320px;
  background:
    radial-gradient(circle at 90% 18%, rgba(159, 214, 205, 0.35), transparent 30%),
    var(--paper-bright);
}

.tool-card-topline {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: #1a5f4d;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.status span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #3d987e;
  box-shadow: 0 0 0 4px rgba(61, 152, 126, 0.12);
}

.course {
  color: var(--ink-soft);
  font-size: 0.72rem;
  font-weight: 700;
}

.tool-number {
  margin-bottom: 0.75rem;
  color: var(--orange-dark);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.tool-card h3 {
  margin-bottom: 0.85rem;
  font-family: "Instrument Serif", Georgia, serif;
  font-size: clamp(2rem, 3vw, 3.15rem);
  font-weight: 400;
  letter-spacing: -0.035em;
  line-height: 0.98;
}

.tool-card > p,
.tool-card-body p {
  color: var(--ink-soft);
  line-height: 1.65;
}

.tool-card-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 0.42fr);
  gap: 2rem;
}

.mini-visual {
  position: relative;
  min-height: 150px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background:
    linear-gradient(rgba(19, 42, 53, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(19, 42, 53, 0.05) 1px, transparent 1px),
    rgba(245, 240, 229, 0.7);
  background-size: 22px 22px;
}

.mini-region {
  position: absolute;
  left: 18%;
  bottom: 16%;
  width: 52%;
  height: 58%;
  background: rgba(159, 214, 205, 0.55);
  clip-path: polygon(0 100%, 0 55%, 45% 0, 100% 34%, 88% 100%);
}

.mini-line {
  position: absolute;
  left: 14%;
  width: 78%;
  height: 3px;
  background: var(--ink);
  transform-origin: left center;
}

.mini-line-one {
  top: 66%;
  transform: rotate(-27deg);
}

.mini-line-two {
  top: 26%;
  background: var(--orange);
  transform: rotate(21deg);
}

.mini-dot {
  position: absolute;
  top: 30%;
  left: 48%;
  width: 13px;
  height: 13px;
  border: 3px solid var(--paper-bright);
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 2px var(--orange);
}

.tool-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 1rem;
  margin-top: auto;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}

.tool-card-footer ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.tool-card-footer li {
  padding: 0.35rem 0.55rem;
  border-radius: 999px;
  background: rgba(19, 42, 53, 0.065);
  color: var(--ink-soft);
  font-size: 0.7rem;
  font-weight: 600;
}

.launch-link {
  flex: 0 0 auto;
  display: inline-flex;
  gap: 0.5rem;
  align-items: center;
  color: var(--orange-dark);
  font-size: 0.87rem;
  font-weight: 700;
  text-decoration: none;
}

.use-guide {
  display: grid;
  grid-template-columns: minmax(0, 0.65fr) minmax(0, 1.35fr);
  gap: 3rem;
  margin: 3rem 0 5rem;
  padding: clamp(1.5rem, 4vw, 3.2rem);
  border-radius: var(--radius-lg);
  color: var(--paper-bright);
  background: var(--blue);
}

.use-guide .kicker {
  color: var(--aqua);
}

.use-guide h2 {
  font-size: clamp(2.7rem, 4vw, 4.3rem);
}

.use-guide ol {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.use-guide li {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 0.35rem 0.65rem;
  padding: 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.17);
  color: rgba(255, 253, 247, 0.74);
  line-height: 1.55;
}

.use-guide li span {
  grid-row: 1 / 3;
  color: var(--aqua);
  font-family: "Instrument Serif", Georgia, serif;
  font-size: 1.4rem;
  font-style: italic;
}

.use-guide li strong {
  display: block;
  color: var(--paper-bright);
}

.site-footer {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 2rem;
  align-items: start;
  padding: 2.2rem 0 3rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.84rem;
}

.site-footer strong {
  color: var(--ink);
}

.site-footer p {
  margin: 0.25rem 0 0;
  line-height: 1.6;
}

.site-footer > a {
  color: var(--orange-dark);
  font-weight: 700;
  text-decoration: none;
}

.not-found {
  display: flex;
  min-height: 100vh;
  max-width: 760px;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding-block: 3rem;
}

.not-found h1 {
  max-width: 10ch;
  margin-bottom: 1rem;
  color: var(--ink);
  font-size: clamp(3.4rem, 9vw, 7rem);
}

.not-found > p:not(.kicker) {
  max-width: 36rem;
  color: var(--ink-soft);
  font-size: 1.05rem;
  line-height: 1.7;
}

.not-found .button-primary {
  margin-top: 1rem;
  color: var(--paper-bright);
  background: var(--ink);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 3px solid #f1a72f;
  outline-offset: 4px;
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    min-height: 360px;
    margin: 0 1.5rem 1.5rem;
  }

  .catalog-intro,
  .use-guide {
    grid-template-columns: 1fr;
  }

  .tool-grid {
    grid-template-columns: 1fr;
  }

  .tool-card {
    min-height: 320px;
  }
}

@media (max-width: 680px) {
  .site-header {
    align-items: flex-start;
    padding-top: 0.85rem;
  }

  .brand small,
  .site-nav > a:not(.nav-directory) {
    display: none;
  }

  .site-nav .nav-directory {
    margin-left: 0;
  }

  .hero {
    min-height: 0;
    border-radius: 26px;
  }

  .hero-copy {
    padding: 3rem 1.35rem 2rem;
  }

  h1 {
    font-size: clamp(3.6rem, 19vw, 5rem);
  }

  .hero-visual {
    min-height: 280px;
    margin: 0 0.85rem 0.85rem;
  }

  .catalog-intro {
    gap: 1.2rem;
    padding-top: 4.5rem;
  }

  .discipline-header {
    grid-template-columns: 48px 1fr;
  }

  .discipline-header > p {
    grid-column: 1 / -1;
  }

  .tool-card-body {
    grid-template-columns: 1fr;
  }

  .mini-visual {
    min-height: 130px;
  }

  .tool-card-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .use-guide ol {
    grid-template-columns: 1fr;
  }

  .site-footer {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}