:root {
  color-scheme: light;
  --ink: #1d1c1a;
  --muted: #5b5f66;
  --paper: #f7f5f0;
  --sand: #efe8dc;
  --accent: #2f6f6d;
  --accent-soft: #cfe5e4;
  --line: #d7d0c3;
  --shadow: 0 12px 30px rgba(29, 28, 26, 0.08);
  --radius: 24px;
  --max-width: 1080px;
  --gap: clamp(1.5rem, 4vw, 3rem);
  --font-serif: "Playfair Display", "Georgia", serif;
  --font-sans: "Poppins", "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-scale-1: clamp(3rem, 6vw, 5rem);
  --font-scale-2: clamp(1.8rem, 3vw, 2.8rem);
  --font-scale-3: clamp(1.1rem, 1.8vw, 1.3rem);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  width: 100%;
  overflow-x: hidden;
}

body {
  margin: 0;
  padding: 0;
  width: 100%;
  font-family: var(--font-sans);
  color: var(--ink);
  background-color: var(--paper);
  line-height: 1.7;
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 100%;
  background-image: url("vecteezy_a-stack-of-rocks-is-sitting-on-top-of-each-other_69918759.jpg");
  background-size: cover;
  background-position: center;
  transform: scaleX(-1);
  z-index: -1;
  pointer-events: none;
}

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

.skip-link {
  position: absolute;
  left: -999px;
  top: 1rem;
  padding: 0.75rem 1.25rem;
  background: var(--accent);
  color: #ffffff;
  border-radius: 999px;
  text-decoration: none;
  z-index: 10;
}

.skip-link:focus-visible {
  left: 1rem;
}

.main-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(247, 245, 240, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(215, 208, 195, 0.4);
  padding: 1rem 0;
}

.main-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  width: 40px;
  height: 40px;
  justify-content: center;
  align-items: center;
  z-index: 101;
}

.menu-toggle span {
  display: block;
  width: 25px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.main-nav.menu-open .menu-toggle span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

.main-nav.menu-open .menu-toggle span:nth-child(2) {
  opacity: 0;
}

.main-nav.menu-open .menu-toggle span:nth-child(3) {
  transform: rotate(-45deg) translate(8px, -8px);
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: clamp(1rem, 3vw, 2rem);
  justify-content: center;
  align-items: center;
}

.nav-list li {
  margin: 0;
}

.nav-list a {
  color: var(--ink);
  text-decoration: none;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 1rem;
  border-radius: 999px;
  transition: all 0.3s ease;
  display: block;
}

.nav-list a:hover {
  background: var(--accent-soft);
  color: var(--accent);
  transform: translateY(-2px);
}

.nav-list a:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.container {
  width: min(100% - clamp(2rem, 4vw, 6rem), var(--max-width));
  margin: 0 auto;
  box-sizing: border-box;
}

.section {
  padding: clamp(3.5rem, 8vw, 6rem) clamp(2rem, 6vw, 4rem);
}

.section.container {
  width: 100%;
  margin: 0;
}

.site-header {
  background: transparent;
  border-bottom: 1px solid rgba(215, 208, 195, 0.6);
}

.hero {
  padding: clamp(3rem, 7vw, 6rem) 0 clamp(2.5rem, 6vw, 4rem);
  position: relative;
  overflow: hidden;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-weight: 500;
  font-size: 0.85rem;
  color: var(--accent-soft);
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.8), 0 1px 4px rgba(0, 0, 0, 0.9), 0 0 20px rgba(0, 0, 0, 0.6);
  margin: 1rem 1rem 1rem;
}

h1 {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: var(--font-scale-1);
  margin: 0 0 1rem;
  color: #9ed3cc;
  letter-spacing: -0.01em;
  font-style: italic;
}

.subtitle {
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: var(--font-scale-3);
  max-width: 42rem;
  color: var(--accent-soft);
  text-shadow: 0 3px 16px rgba(0, 0, 0, 0.8), 0 1px 6px rgba(0, 0, 0, 0.9), 0 0 25px rgba(0, 0, 0, 0.65);
  line-height: 1.5;
  letter-spacing: 0.02em;
  margin: 1rem 1rem 1rem;
}

h2 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: var(--font-scale-2);
  margin: 0 0 1rem;
}

h3 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
}

.definition-grid {
  display: grid;
  gap: var(--gap);
  align-items: start;
  grid-template-columns: 1fr;
}

.definition-left {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
  width: 100%;
  max-width: 100%;
}

.definition-list {
  margin: 0;
  padding: 0;
  width: 100%;
  max-width: 100%;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.definition-list div {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--line);
}

.definition-list dt {
  font-family: var(--font-serif);
  font-size: clamp(1.2rem, 3vw, 1.4rem);
  font-weight: 700;
  color: var(--accent);
  word-wrap: break-word;
}

.definition-list dd {
  margin: 0.3rem 0 0;
  color: var(--muted);
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.scale-figure {
  margin: 0;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(10px);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.4);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  max-width: 100%;
  overflow: hidden;
}

.balance-scale {
  position: relative;
  height: clamp(150px, 30vw, 200px);
  width: 100%;
  max-width: 240px;
  margin-bottom: 2rem;
}

.scale-base,
.scale-pole,
.scale-beam,
.scale-pan {
  position: absolute;
  background: var(--accent);
  border-radius: 999px;
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.scale-base {
  width: clamp(120px, 66%, 160px);
  height: 14px;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  border-radius: 0;
}

.scale-pole {
  width: clamp(8px, 5%, 12px);
  height: clamp(120px, 80%, 160px);
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  border-radius: 0;
}

.scale-beam {
  width: clamp(180px, 100%, 240px);
  height: 10px;
  top: 40px;
  left: 50%;
  transform: translateX(-50%);
  transform-origin: center;
  animation: sway 5s infinite ease-in-out;
  background: var(--accent);
}

.scale-pan {
  width: clamp(60px, 33%, 80px);
  height: 14px;
  background: var(--accent);
  top: 90px;
  border-radius: 0 0 40px 40px;
}

.scale-pan::before {
  content: "";
  position: absolute;
  top: -50px;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: clamp(35px, 70%, 50px);
  background: var(--accent);
}

.scale-pan::after {
  content: "";
  position: absolute;
  top: -50px;
  left: 50%;
  transform: translateX(-50%);
  width: clamp(60px, 33%, 80px);
  height: 50px;
  border-left: 2px solid var(--accent);
  border-right: 2px solid var(--accent);
  border-top: 2px solid transparent;
  border-radius: 50% 50% 0 0;
}

.scale-pan-left {
  left: clamp(-30px, -17%, -40px);
  animation: sway-left 5s infinite ease-in-out;
}

.scale-pan-right {
  right: clamp(-30px, -17%, -40px);
  animation: sway-right 5s infinite ease-in-out;
}

@keyframes sway {
  0%, 100% { transform: translateX(-50%) rotate(-4deg); }
  50% { transform: translateX(-50%) rotate(4deg); }
}

@keyframes sway-left {
  0%, 100% { transform: translateY(12px); }
  50% { transform: translateY(-12px); }
}

@keyframes sway-right {
  0%, 100% { transform: translateY(-12px); }
  50% { transform: translateY(12px); }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.card-grid {
  display: grid;
  gap: var(--gap);
}

.card {
  padding: 2.5rem;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: var(--shadow);
  transition: transform 0.6s ease-out, box-shadow 0.3s ease, opacity 0.6s ease-out;
  opacity: 0;
  transform: translateY(30px);
}

.card.in-view {
  opacity: 1;
  transform: translateY(0);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(29, 28, 26, 0.12);
}

.usage-grid {
  display: grid;
  gap: var(--gap);
  grid-template-columns: 1fr;
}

.usage-block {
  padding: 0;
}

.usage-block h3 {
  margin-bottom: 1rem;
  color: var(--accent);
}

.usage-block ul {
  margin: 0.75rem 0 0;
  padding-left: 1.1rem;
  list-style-position: outside;
}

.forms-grid {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  margin-bottom: 1rem;
}

.word-chip {
  padding: 0.8rem 1.4rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  text-align: center;
  font-weight: 600;
  transition: transform 0.5s ease-out, opacity 0.5s ease-out, background 0.2s ease, color 0.2s ease;
  cursor: default;
  opacity: 0;
  transform: scale(0.9);
}

.word-chip.in-view {
  opacity: 1;
  transform: scale(1);
}

.word-chip:hover {
  background: var(--accent);
  color: #ffffff;
  transform: scale(1.05);
}

.note {
  color: var(--muted);
}

.description-content {
  margin: 0;
  line-height: 1.8;
  width: 100%;
  max-width: 100%;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.description-content p {
  margin: 0 0 1.5rem;
  font-size: 1.05rem;
  color: var(--ink);
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.description-content p:last-child {
  margin-bottom: 0;
}

.description-content em {
  font-style: italic;
  color: var(--accent);
  font-weight: 500;
}

.personal-grid {
  display: grid;
  gap: var(--gap);
  grid-template-columns: 1fr;
  margin-top: 1.5rem;
  align-items: center;
}

.personal-content {
  margin: 0;
  line-height: 1.9;
}

.personal-content p {
  margin: 0;
  font-size: 1.1rem;
  color: var(--ink);
}

.personal-image {
  margin: 0;
  padding: 0;
}

.personal-image img {
  width: 50%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  object-fit: cover;
  margin: 0 auto;
  display: block;
}

.quotes-grid {
  display: grid;
  gap: var(--gap);
  grid-template-columns: 1fr;
  margin-top: 1.5rem;
}

.quote-card {
  margin: 0;
  padding: 2.5rem;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: var(--shadow);
  transition: transform 0.6s ease-out, box-shadow 0.3s ease, opacity 0.6s ease-out;
  position: relative;
  opacity: 0;
  transform: translateY(30px);
}

.quote-card.in-view {
  opacity: 1;
  transform: translateY(0);
}

.quote-card::before {
  content: "\201C";
  position: absolute;
  top: 1rem;
  left: 1.5rem;
  font-family: var(--font-serif);
  font-size: 4rem;
  line-height: 1;
  color: var(--accent);
  opacity: 0.3;
}

.quote-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(29, 28, 26, 0.15);
}

.quote-text {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 1.8vw, 1.4rem);
  font-style: italic;
  line-height: 1.8;
  color: var(--ink);
  margin: 0 0 1.5rem;
  padding-left: 2.5rem;
}

.quote-author {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent);
  font-style: normal;
  text-align: right;
  margin-top: 1rem;
}

.quote-author::before {
  content: "— ";
  margin-right: 0.25rem;
}

.site-footer {
  padding: clamp(4rem, 8vw, 8rem) 0;
  background: var(--ink);
  color: #ffffff;
}

main {
  width: 100%;
}

main .section {
  background: var(--paper);
  border-top: 1px solid rgba(215, 208, 195, 0.5);
  width: 100%;
}

main .section > h2,
main .section > .definition-grid,
main .section > .card-grid,
main .section > .usage-grid,
main .section > .forms-grid,
main .section > .personal-grid,
main .section > .quotes-grid,
main .section > .description-content,
main .section > .personal-content,
main .section > .note {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

main .section.in-view > h2,
main .section.in-view > .definition-grid,
main .section.in-view > .card-grid,
main .section.in-view > .usage-grid,
main .section.in-view > .forms-grid,
main .section.in-view > .personal-grid,
main .section.in-view > .quotes-grid,
main .section.in-view > .description-content,
main .section.in-view > .personal-content,
main .section.in-view > .note {
  opacity: 1;
  transform: translateY(0);
}

main .section:nth-of-type(even) {
  background: rgba(247, 245, 240, 0.4);
  backdrop-filter: blur(4px);
}

main .section:nth-of-type(odd) {
  background: rgba(247, 245, 240, 0.85);
  backdrop-filter: blur(2px);
}

.site-footer p {
  margin: 0;
  font-size: clamp(1.3rem, 3vw, 2.2rem);
  font-family: var(--font-serif);
  font-weight: 400;
  font-style: italic;
  line-height: 1.6;
  max-width: 50ch;
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

a {
  color: inherit;
}

*:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

@media (max-width: 719px) {
  .menu-toggle {
    display: flex;
  }

  .nav-list {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(247, 245, 240, 0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid rgba(215, 208, 195, 0.4);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: max-height 0.3s ease, opacity 0.3s ease, visibility 0.3s ease;
  }

  .main-nav.menu-open .nav-list {
    max-height: 500px;
    opacity: 1;
    visibility: visible;
  }

  .nav-list a {
    width: 100%;
    text-align: center;
    padding: 0.75rem 1rem;
  }
}

@media (min-width: 720px) {
  .definition-grid {
    grid-template-columns: 1.2fr 1fr;
  }

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

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

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

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

@media (min-width: 1000px) {
  .card-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .hero {
    padding-bottom: 5rem;
  }
}

.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 50%;
  background: var(--accent);
  color: #ffffff;
  border: none;
  cursor: pointer;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(29, 28, 26, 0.2);
  transition: all 0.3s ease;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  z-index: 99;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--ink);
  transform: translateY(-4px);
  box-shadow: 0 6px 16px rgba(29, 28, 26, 0.3);
}

.back-to-top:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.back-to-top span {
  line-height: 1;
  font-weight: bold;
}