:root {
  --paper: #f2efe7;
  --paper-deep: #e5dfd2;
  --ink: #142027;
  --ink-soft: #536066;
  --line: rgba(20, 32, 39, 0.18);
  --line-strong: rgba(20, 32, 39, 0.42);
  --accent: #d94b2b;
  --accent-dark: #9f2f1b;
  --teal: #176b63;
  --white: #fffdf8;
  --shadow: 0 24px 70px rgba(20, 32, 39, 0.12);
  --display: "Avenir Next Condensed", "DIN Condensed", "PingFang SC", sans-serif;
  --body: "Gill Sans", "Avenir Next", "PingFang SC", "Hiragino Sans GB", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background:
    radial-gradient(circle at 9% 5%, rgba(217, 75, 43, 0.13), transparent 28rem),
    radial-gradient(circle at 90% 22%, rgba(23, 107, 99, 0.11), transparent 34rem),
    var(--paper);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.6;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(rgba(20, 32, 39, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20, 32, 39, 0.045) 1px, transparent 1px);
  background-size: 48px 48px;
  content: "";
  mask-image: linear-gradient(to bottom, black, transparent 84%);
}

.page-noise {
  position: fixed;
  inset: 0;
  z-index: 20;
  pointer-events: none;
  opacity: 0.28;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.09'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
}

.backdrop-number {
  position: absolute;
  top: -2.4rem;
  right: -1.5rem;
  z-index: -1;
  color: transparent;
  font-family: var(--display);
  font-size: clamp(12rem, 32vw, 34rem);
  font-weight: 800;
  line-height: 0.8;
  letter-spacing: -0.09em;
  -webkit-text-stroke: 1px rgba(20, 32, 39, 0.08);
  user-select: none;
}

.site-header,
main,
.site-footer {
  width: min(1180px, calc(100% - 40px));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 92px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  color: var(--ink);
  font-family: var(--display);
  font-weight: 800;
  letter-spacing: -0.05em;
  text-decoration: none;
}

.brand-mark {
  font-size: 1.35rem;
}

.brand-dot {
  color: var(--accent);
  font-size: 1.9rem;
}

.brand-word {
  margin-left: 0.3rem;
  font-size: 0.8rem;
  letter-spacing: 0.22em;
}

.header-meta {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--ink-soft);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.signal-dot {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 5px rgba(23, 107, 99, 0.12);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2.2rem, 7vw, 6.5rem);
  min-height: min(780px, calc(100vh - 92px));
  padding: clamp(4.5rem, 10vw, 9rem) 0 4rem;
}

.hero-kicker {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--ink-soft);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.2em;
}

.kicker-line {
  width: clamp(2rem, 8vw, 7rem);
  height: 1px;
  background: var(--line-strong);
}

.hero h1 {
  max-width: 980px;
  margin: 0;
  font-family: var(--display);
  font-size: clamp(3.6rem, 9vw, 8.2rem);
  font-weight: 800;
  line-height: 0.9;
  letter-spacing: -0.065em;
}

.hero h1 span {
  display: block;
  color: var(--accent);
}

.hero-bottom {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) auto;
  align-items: end;
  gap: 2rem;
  margin-top: auto;
}

.hero-bottom p {
  max-width: 650px;
  margin: 0;
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.8vw, 1.25rem);
}

.hero-action {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  min-width: 190px;
  padding: 1rem 1.15rem;
  border: 1px solid var(--ink);
  color: var(--ink);
  font-size: 0.88rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
  transition: color 180ms ease, background 180ms ease, transform 180ms ease;
}

.hero-action:hover {
  color: var(--white);
  background: var(--ink);
  transform: translateY(-3px);
}

.tools-section,
.principles {
  padding: clamp(4rem, 8vw, 7rem) 0;
  border-top: 1px solid var(--line);
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: 2.25rem;
}

.section-heading.compact {
  margin-bottom: 1.6rem;
}

.section-index {
  margin: 0 0 0.45rem;
  color: var(--accent);
  font-size: 0.7rem;
  font-weight: 900;
  letter-spacing: 0.2em;
}

.section-heading h2 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(2.2rem, 5vw, 4rem);
  line-height: 1;
  letter-spacing: -0.045em;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.filter {
  padding: 0.58rem 0.82rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-soft);
  background: rgba(255, 253, 248, 0.4);
  font: inherit;
  font-size: 0.76rem;
  font-weight: 800;
  cursor: pointer;
  transition: border-color 160ms ease, color 160ms ease, background 160ms ease;
}

.filter:hover,
.filter.is-active {
  border-color: var(--ink);
  color: var(--white);
  background: var(--ink);
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 1rem;
}

.tool-card {
  position: relative;
  grid-column: span 6;
  display: flex;
  min-height: 255px;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.4rem;
  overflow: hidden;
  border: 1px solid var(--line);
  color: var(--ink);
  background: rgba(255, 253, 248, 0.72);
  box-shadow: 0 12px 34px rgba(20, 32, 39, 0.05);
  text-decoration: none;
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
  animation: card-in 500ms both;
}

.tool-card::after {
  position: absolute;
  right: -3rem;
  bottom: -5rem;
  width: 11rem;
  height: 11rem;
  border: 1px solid rgba(20, 32, 39, 0.08);
  border-radius: 50%;
  content: "";
  transition: transform 300ms ease;
}

a.tool-card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow);
  transform: translateY(-6px);
}

a.tool-card:hover::after {
  transform: scale(1.18);
}

.tool-card.is-planned {
  color: var(--ink-soft);
  background: rgba(229, 223, 210, 0.48);
}

.tool-topline,
.tool-footer {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.tool-icon {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border: 1px solid var(--line);
  background: var(--paper);
}

.tool-icon svg {
  width: 24px;
  height: 24px;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 0.42rem;
  color: var(--ink-soft);
  font-size: 0.7rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.status::before {
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: currentColor;
  content: "";
}

.status.online {
  color: var(--teal);
}

.status.planned {
  color: var(--accent);
}

.tool-copy {
  position: relative;
  z-index: 1;
  margin: 2.7rem 0 1.6rem;
}

.tool-category {
  margin: 0 0 0.45rem;
  color: var(--ink-soft);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.tool-copy h3 {
  margin: 0 0 0.65rem;
  font-family: var(--display);
  font-size: clamp(1.8rem, 3vw, 2.7rem);
  line-height: 1;
  letter-spacing: -0.035em;
}

.tool-copy p {
  max-width: 460px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.tool-footer {
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tool-footer .arrow {
  color: var(--accent);
  font-size: 1.25rem;
  transition: transform 180ms ease;
}

a.tool-card:hover .arrow {
  transform: translateX(5px);
}

.loading-card,
.empty-card {
  grid-column: 1 / -1;
  padding: 3rem;
  border: 1px dashed var(--line-strong);
  color: var(--ink-soft);
  text-align: center;
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.principle-grid article {
  position: relative;
  min-height: 230px;
  padding: 1.5rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 253, 248, 0.35);
}

.principle-number {
  display: block;
  margin-bottom: 3rem;
  color: var(--accent);
  font-family: var(--display);
  font-size: 1.1rem;
  font-weight: 900;
}

.principle-grid h3 {
  margin: 0 0 0.5rem;
  font-family: var(--display);
  font-size: 1.65rem;
  letter-spacing: -0.025em;
}

.principle-grid p {
  margin: 0;
  color: var(--ink-soft);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.noscript-note {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 30;
  padding: 0.8rem 1rem;
  color: var(--white);
  background: var(--accent-dark);
}

@keyframes card-in {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 820px) {
  .site-header,
  main,
  .site-footer {
    width: min(100% - 28px, 1180px);
  }

  .header-meta span:last-child {
    display: none;
  }

  .hero {
    min-height: auto;
    padding-top: 4.5rem;
  }

  .hero-bottom,
  .section-heading {
    grid-template-columns: 1fr;
  }

  .section-heading {
    display: grid;
  }

  .tool-card {
    grid-column: 1 / -1;
  }

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

  .principle-grid article {
    min-height: auto;
  }

  .principle-number {
    margin-bottom: 1.5rem;
  }
}

@media (max-width: 520px) {
  .hero h1 {
    font-size: clamp(3rem, 16vw, 4.5rem);
  }

  .hero-action {
    width: 100%;
  }

  .site-footer {
    flex-direction: column;
    gap: 0.4rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}