:root {
  --container: 1080px;
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 2.5rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --text: #0f1014;
  --muted: #4f5563;
  --border: #e2e7ef;
  --bg: #ffffff;
  --radius: 14px;
  --shadow: 0 25px 60px rgba(8, 9, 42, 0.15);
  --accent-iridescent: linear-gradient(135deg, #578cff, #8e57ff, #5757ff, #57c1ff, #c557ff, #acacff);
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Open Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a:focus-visible {
  outline: 2px solid transparent;
  box-shadow: 0 0 0 3px rgba(87, 140, 255, 0.35), 0 0 0 5px rgba(197, 87, 255, 0.3);
  border-radius: 8px;
}

h1, h2, h3 {
  font-family: "Fredoka", "Open Sans", sans-serif;
  color: var(--text);
  margin: 0;
  font-weight: 600;
}

p {
  margin: 0;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: #fff;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) 0;
  gap: var(--space-3);
}

.brand-link {
  font-weight: 800;
  letter-spacing: 0.08em;
}

.site-nav {
  display: inline-flex;
  gap: var(--space-4);
}

.site-nav__link {
  font-weight: 600;
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--muted);
}

.main {
  padding: var(--space-8) 0 var(--space-8);
}

.project-hero {
  display: grid;
  gap: var(--space-4);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.9rem;
  color: var(--muted);
}

.project-hero__title {
  font-size: clamp(2.4rem, 4vw, 3.2rem);
  letter-spacing: -0.02em;
}

.project-hero__subtitle {
  font-size: clamp(1.15rem, 2vw, 1.35rem);
  color: var(--muted);
  max-width: 780px;
  font-weight: 500;
}

.meta {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  padding: var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #f7f9fc;
}

.meta__item {
  display: grid;
  gap: 0.2rem;
}

.meta__label {
  font-size: 0.9rem;
  color: var(--muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.meta__value {
  font-weight: 700;
}

.project-intro {
  display: grid;
  gap: var(--space-3);
  max-width: 880px;
}

.project-intro p {
  color: var(--text);
}

.project-cta {
  font-weight: 700;
}

.project-cta:hover,
.project-cta:focus-visible {
  color: var(--muted);
}

.toc {
  display: none;
  margin: var(--space-6) auto 0;
}

.toc__title {
  font-weight: 700;
  margin: 0 0 var(--space-2);
}

.toc__list {
  margin: 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.35rem;
}

.case {
  display: grid;
  gap: var(--space-7);
  margin-top: var(--space-7);
}

.case-section {
  padding: var(--space-6) 0;
  display: grid;
  gap: var(--space-3);
  border-top: 1px solid var(--border);
}

.case-section:first-of-type {
  border-top: none;
}

.case-section__title {
  font-size: 1.3rem;
}

.case-section__body {
  display: grid;
  gap: var(--space-2);
  max-width: 880px;
}

.case-section__body p {
  color: var(--text);
}

.case-section__media {
  width: 100%;
  margin: 0;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, #eef1f7, #dfe5f2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.case-section__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.placeholder-grid {
  display: grid;
  gap: var(--space-2);
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
}

.placeholder-block {
  background: linear-gradient(135deg, #f2f4f8, #e4e9f3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  height: 120px;
}

.back-link__wrap {
  margin-top: var(--space-7);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 700;
}

.back-link:hover,
.back-link:focus-visible {
  color: var(--muted);
}

@media (min-width: 900px) {
  .toc {
    display: block;
  }
}

@media (max-width: 640px) {
  .main {
    padding: var(--space-6) 0 var(--space-7);
  }
}