/* styles.css */

/* ── CSS @layer: forward declaration establishes cascade priority ── */
/* base < layout < components < pages – höhere Layer gewinnen bei Konflikten */
@layer base, layout, components, pages;

:root {
  --bg: #fafaf8;
  --fg: #0a0a0a;
  --muted: #6b6b6b;
  --border: #e5e5e0;
  --card-bg: #f0f0ec;
  --font-serif: 'Unbounded', Georgia, serif;
  --font-sans: 'Noto Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
}

html {
  scroll-behavior: smooth;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Navigation ── */

header {
  position: fixed;
  top: 1rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  width: 92%;
  max-width: 1100px;
  display: flex;
  justify-content: space-between;
  align-items: center;
    padding: .75rem 1.5rem .75rem 1.5rem;
  border-radius: 50px;
  background: rgba(250, 250, 248, 0.85);
  backdrop-filter: blur(20px) brightness(1.02);
  -webkit-backdrop-filter: blur(20px) brightness(1.02);
  border: 1px solid rgba(229, 229, 224, 0.6);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.07), inset 0 1px 1px rgba(255, 255, 255, 0.5);
  transition: transform 0.35s ease, background 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

header.nav-hidden {
  transform: translateX(-50%) translateY(-180%);
}

/* ── Home navbar: subtle glass over dark hero, full glass past hero ── */

.home-navbar {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(255, 255, 255, 0.22);
  box-shadow: 0 4px 32px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.18), inset 0 -1px 0 rgba(255, 255, 255, 0.1);
  transition: background 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

.home-navbar:not(.past-hero) nav a,
.home-navbar:not(.past-hero) .nav-social-link,
.home-navbar:not(.past-hero) .nav-hamburger {
  color: rgba(255, 255, 255, 0.7);
}

.home-navbar:not(.past-hero) nav a:hover,
.home-navbar:not(.past-hero) .nav-social-link:hover,
.home-navbar:not(.past-hero) .nav-hamburger:hover {
  color: #fff;
}

.home-navbar:not(.past-hero) .nav-social-link:hover,
.home-navbar:not(.past-hero) .nav-hamburger:hover {
  background: rgba(255, 255, 255, 0.12);
}

.home-navbar.past-hero {
  background: rgba(250, 250, 248, 0.85);
  border-color: rgba(229, 229, 224, 0.6);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.07), inset 0 1px 1px rgba(255, 255, 255, 0.5);
}

.logo {
  text-decoration: none;
  display: flex;
  align-items: center;
}

.logo-img {
  height: 40px;
  width: auto;
  display: block;
}

nav {
  display: flex;
  align-items: center;
}

header nav {
  gap: 1.5rem;
}

nav a {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}

nav a:hover {
  color: var(--fg);
}

nav .nav-current {
  font-weight: 600;
  color: var(--fg);
}

nav .nav-cta {
  background: var(--fg);
  color: var(--bg);
  padding: 0.5rem 1.25rem;
  border-radius: 100px;
  font-weight: 500;
  transition: opacity 0.2s;
}

nav .nav-cta:hover {
  color: var(--bg);
  opacity: 0.7;
}

.nav-social {
  display: flex;
  align-items: center;
  gap: 0.1rem;
  margin-left: auto;
}

.nav-social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: none;
  background: none;
  color: var(--muted);
  text-decoration: none;
  border-radius: 6px;
  cursor: pointer;
  transition: color 0.2s, background 0.2s;
}

.nav-social-link:hover {
  color: var(--fg);
  background: var(--card-bg);
}

/* Email button: dark icon on light navbars */
.nav-social-link[data-contact-modal] {
  color: var(--fg);
}

/* Hamburger auf dunklen Navbars weiß */
.about-navbar:not(.past-hero) .nav-hamburger {
  color: rgba(255, 255, 255, 0.7);
}

.about-navbar:not(.past-hero) .nav-hamburger:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
}

/* Email button: light icon + subtle chip on dark navbars */
.home-navbar:not(.past-hero) .nav-social-link[data-contact-modal],
.case-navbar:not(.past-hero) .nav-social-link[data-contact-modal],
.about-navbar .nav-social-link[data-contact-modal] {
  background: rgba(255, 255, 255, 0.14);
  color: rgba(255, 255, 255, 0.9);
  border-radius: 8px;
}

.home-navbar:not(.past-hero) .nav-social-link[data-contact-modal]:hover,
.case-navbar:not(.past-hero) .nav-social-link[data-contact-modal]:hover,
.about-navbar .nav-social-link[data-contact-modal]:hover {
  background: rgba(255, 255, 255, 0.24);
  color: #fff;
  opacity: 1;
}

.nav-hamburger {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  background: none;
  border: none;
  border-radius: 8px;
  color: var(--muted);
  cursor: pointer;
  flex-shrink: 0;
  transition: color 0.2s, background 0.2s;

  &:hover {
    color: var(--fg);
    background: var(--card-bg);
  }
}

.home-navbar:not(.past-hero) .nav-hamburger,
.case-navbar:not(.past-hero) .nav-hamburger {
  color: rgba(255, 255, 255, 0.9);

  &:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.12);
  }
}

/* ── Mobile Menu ── */

#mobile-menu {
  position: fixed;
  top: 5rem;
  left: 50%;
  transform: translateX(-50%) translateY(-16px);
  width: 92%;
  max-width: 1100px;
  height: calc(85svh - 5rem);
  background: var(--bg);
  border-radius: 24px;
  border: 1px solid var(--border);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.1);
  z-index: 99;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.28s cubic-bezier(0.22, 1, 0.36, 1), transform 0.28s cubic-bezier(0.22, 1, 0.36, 1);

  &.is-open {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
  }
}

.mobile-menu-nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;

  a {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 8vw, 3rem);
    font-weight: 700;
    color: var(--fg);
    text-decoration: none;
    letter-spacing: -0.03em;
    line-height: 1;
    transition: opacity 0.2s;

    &:hover {
      opacity: 0.4;
    }
  }
}

.mobile-menu-social {
  display: flex;
  gap: 0.5rem;

  .nav-social-link {
    display: flex;
    width: 2.75rem;
    height: 2.75rem;
    color: var(--muted);
    border-radius: 8px;
    background: var(--card-bg);

    &:hover {
      color: var(--fg);
      background: var(--border);
    }
  }
}

@media (min-width: 769px) {
  #mobile-menu { display: none; }
}

/* ── Hero ── */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: #001724;
}

#status-indicator {
  position: absolute;
  bottom: 2rem;
  right: 5vw;
  color: rgba(255, 255, 255, 0.25);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  pointer-events: none;
  z-index: 1;
}

#particleCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 9rem 5vw 5rem;
  max-width: 860px;
}

.hero-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.6rem, 6vw, 5rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin-bottom: 1.5rem;
  color: #fff;
}

.hero-title em {
  font-style: italic;
  font-weight: 300;
}

.hero-desc {
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.6);
  max-width: 520px;
  margin-bottom: 2.5rem;
  line-height: 1.75;
  text-shadow: 0 1px 12px rgba(0, 0, 0, 0.9), 0 0 32px rgba(0, 0, 0, 0.8);
}

.cta-btn {
  display: inline-block;
  background: #fff;
  color: #0a0a0a;
  text-decoration: none;
  padding: 0.85rem 2rem;
  border-radius: 100px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: opacity 0.2s;
}

.cta-btn:hover {
  opacity: 0.72;
}

/* ── Marquee ── */

.marquee-section {
  overflow: hidden;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 0.9rem 0;
  background: var(--bg);
}

.marquee-track {
  display: flex;
  gap: 2rem;
  white-space: nowrap;
  width: max-content;
  animation: marquee 24s linear infinite;
}

.marquee-track span {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--muted);
  letter-spacing: 0.06em;
}

.marquee-track .sep {
  color: var(--border);
}

@keyframes marquee {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* ── Sections ── */

.section {
  padding: 6rem 5vw;
}

.section-header {
  margin-bottom: 3rem;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: var(--fg);
}

/* ── Project Cards ── */

.projects-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-bottom: 3rem;
}

.project-card {
  display: block;
  border-radius: 18px;
  overflow: hidden;
  position: relative;
  aspect-ratio: 3 / 2;
  text-decoration: none;
  color: inherit;
  background: var(--card-bg);
}

.card-bg {
  position: absolute;
  inset: 0;
}

.card-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
  display: block;
}

.project-card:hover .card-bg img {
  transform: scale(1.06);
}

/* gradient overlay */
.card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.18) 0%,
    rgba(0, 0, 0, 0.0) 35%,
    rgba(0, 0, 0, 0.0) 50%,
    rgba(0, 0, 0, 0.65) 100%
  );
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.25rem 1.25rem 1.5rem;
}

.card-top {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.project-metric {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.01em;
}

.project-tag {
font-family: var(--font-mono);
    font-size: 0.75rem;
    color: rgba(80, 80, 80, 1);
    background: rgba(255, 255, 255, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(6px);
    padding: 0.2rem 0.65rem;
    border-radius: 100px;
    letter-spacing: 0.05em;
}

.card-bottom {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.project-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  margin: 0;
}

.project-desc {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.5;
  margin: 0;
}

/* Arrow: hidden by default, shown on hover */
.project-arrow {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  font-size: 1.75rem;
  line-height: 1;
  color: #fff;
  opacity: 0;
  transition: opacity 0.25s ease, transform 0.25s ease;
  transform: translate(4px, -4px);
  pointer-events: none;
}

.project-card:hover .project-arrow {
  opacity: 1;
  transform: translate(0, 0);
}

/* Always visible on touch devices */
@media (hover: none) {
  .project-arrow {
    opacity: 1;
    transform: translate(0, 0);
  }
}

.all-projects-link {
  margin-top: 0.5rem;
  text-align: center;
}

.project-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--fg);
  text-decoration: none;
  border-bottom: 1px solid var(--fg);
  padding-bottom: 2px;
  transition: opacity 0.2s;
}

.project-link:hover {
  opacity: 0.45;
}

/* ── Contact ── */

.contact {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 480px;
  margin: 0 auto;
}

.contact input,
.contact textarea {
  width: 100%;
  padding: 0.9rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.2s;
}

.contact input::placeholder,
.contact textarea::placeholder {
  color: #bbb;
}

.contact input:focus,
.contact textarea:focus {
  border-color: var(--fg);
}

.contact textarea {
  min-height: 130px;
  resize: vertical;
}

.contact button {
  align-self: flex-start;
  background: var(--fg);
  color: var(--bg);
  border: none;
  padding: 0.75rem 1.75rem;
  border-radius: 100px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.2s;
}

.contact button:hover {
  opacity: 0.7;
}

/* ── Contact Modal ── */

@keyframes modal-in {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

#contact-modal {
  border: none;
  border-radius: 18px;
  padding: 0;
  max-width: 480px;
  width: calc(100% - 2rem);
  background: var(--bg);
  box-shadow: 0 8px 48px rgba(0, 0, 0, 0.18);
  margin: auto;
  animation: modal-in 0.28s cubic-bezier(0.22, 1, 0.36, 1) both;
}

#contact-modal::backdrop {
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.contact-modal-inner {
  padding: 2rem;
  position: relative;
}

.contact-modal-inner h2 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

.contact-modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--muted);
  border-radius: 6px;
  transition: color 0.2s, background 0.2s;

  &:hover {
    color: var(--fg);
    background: var(--card-bg);
  }
}

/* ── Footer ── */

footer {
  border-top: 1px solid var(--border);
  padding: 2rem 5vw;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  text-align: center;
}

.footer-logo {
  display: flex;
  align-items: center;
}

.footer-logo .logo-img {
  height: 28px;
  width: auto;
  display: block;
}

.footer-copy {
  font-size: 0.82rem;
  color: var(--muted);
}

.footer-legal {
  display: flex;
  align-items: center;
  gap: 0;
}

.footer-legal a {
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-legal a:hover { color: var(--fg); }

.footer-legal a + a::before {
  content: '';
  display: inline-block;
  width: 1px;
  height: 0.75em;
  background: var(--border);
  margin: 0 0.75rem;
  vertical-align: middle;
}

/* ── Legal Pages ── */

.legal-page {
  padding-top: 7rem;
  padding-bottom: 4rem;
}

.legal-inner {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 5vw;
}

.legal-inner h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 2.5rem;
}

.legal-inner h2 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
}

.legal-inner p {
  color: var(--muted);
  line-height: 1.75;
  margin-bottom: 0.5rem;
}

.legal-inner a {
  color: var(--fg);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.legal-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.06em;
  margin-bottom: 2rem !important;
}

.legal-inner h3 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--fg);
  margin-top: 1.25rem;
  margin-bottom: 0.35rem;
}

.legal-inner ul {
  list-style: disc;
  padding-left: 1.25rem;
  color: var(--muted);
  line-height: 1.75;
}

.legal-inner small {
  font-size: 0.8rem;
}

/* ── Responsive ── */

@media (max-width: 768px) {
  .projects-grid {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  header nav a:not(.nav-cta) {
    display: none;
  }

  header .nav-social-link {
    display: none;
  }

  .nav-hamburger {
    display: flex;
  }

  .footer-inner {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .section {
    padding: 4rem 5vw;
  }
}

/* ── Contact Modal ── */

dialog:not([open]) {
  display: none;
}

#contact-modal {
  position: fixed;
  inset: 0;
  z-index: 500;
  width: min(480px, 92vw);
  margin: auto;
  padding: 0;
  border: none;
  border-radius: 16px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.25);
  background: var(--bg);
}

#contact-modal::backdrop {
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(4px);
}

.contact-modal-inner {
  padding: 2rem;
  position: relative;
}

.contact-modal-inner h2 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--fg);
}

.contact-modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 2rem;
  height: 2rem;
  border: none;
  background: none;
  border-radius: 6px;
  color: var(--muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s, background 0.2s;
}

.contact-modal-close:hover {
  color: var(--fg);
  background: var(--card-bg);
}

.contact {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.contact input,
.contact textarea {
  width: 100%;
  padding: 0.7rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.2s;
}

.contact input:focus,
.contact textarea:focus { border-color: var(--fg); }

.contact input::placeholder,
.contact textarea::placeholder { color: var(--muted); }

.contact textarea {
  min-height: 120px;
  resize: vertical;
}

.contact button[type="submit"] {
  background: var(--fg);
  color: var(--bg);
  border: none;
  border-radius: 100px;
  padding: 0.7rem 1.5rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  align-self: flex-start;
  transition: opacity 0.2s;
}

.contact button[type="submit"]:hover { opacity: 0.75; }

/* ═══════════════════════════════════════════════════════════════
   Case Study Pages (ehemals mustache.css)
   ═══════════════════════════════════════════════════════════════ */

/* ── Navbar overrides ── */

.case-navbar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  background: rgba(0, 0, 0, 0.22);
  border-color: rgba(255, 255, 255, 0.22);
  box-shadow: 0 4px 32px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.18), inset 0 -1px 0 rgba(255, 255, 255, 0.1);
  transition: background 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

.case-navbar .back-link,
.case-navbar .nav-project-name,
.case-navbar .nav-project-arrow,
.case-navbar .nav-social-link,
.case-navbar .nav-hamburger {
  color: rgba(255, 255, 255, 0.85);
  text-shadow: none;
  transition: color 0.3s ease, opacity 0.3s ease;
}

.case-navbar .back-link:hover,
.case-navbar .nav-social-link:hover,
.case-navbar .nav-hamburger:hover { color: #fff; opacity: 0.75; }

.case-navbar .nav-social-link[data-contact-modal]:hover { opacity: 1; }

.case-navbar.scrolled {
  background: rgba(10, 10, 10, 0.55);
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.35), inset 0 1px 1px rgba(255, 255, 255, 0.08);
}

.case-navbar.past-hero {
  background: rgba(250, 250, 248, 0.85);
  border-color: rgba(229, 229, 224, 0.6);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.07), inset 0 1px 1px rgba(255, 255, 255, 0.5);
}

.case-navbar.past-hero .back-link,
.case-navbar.past-hero .nav-project-name,
.case-navbar.past-hero .nav-project-arrow,
.case-navbar.past-hero .nav-social-link {
  color: var(--muted);
}

.case-navbar.past-hero .back-link:hover,
.case-navbar.past-hero .nav-social-link:hover { color: var(--fg); opacity: 1; }

.case-nav-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.case-nav-left .logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.back-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-serif);
  font-size: 0.8rem;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
  flex-shrink: 0;
  padding-left: 0.75rem;
}

.back-link:hover { color: var(--fg); }

.case-nav-center {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-project-name {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 1rem;
  color: var(--fg);
  white-space: nowrap;
  min-width: 120px;
  text-align: center;
}

.nav-project-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
  flex-shrink: 0;

  &:hover { color: var(--fg); }
}

/* ── Case Hero ── */

.case-hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  overflow: hidden;
}

.case-hero-img {
  position: absolute;
  inset: 0;
}

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

.case-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(10, 10, 10, 0.72) 0%,
    rgba(10, 10, 10, 0.35) 45%,
    rgba(10, 10, 10, 0.08) 100%
  );
  display: flex;
  align-items: flex-end;
  padding: 0 6vw 4.5rem;
}

.case-hero-text {
  max-width: 780px;
}

.case-hero-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: rgba(255, 255, 255, 0.75);
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(8px);
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
  letter-spacing: 0.04em;
}

.case-hero-title {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 7.5vw, 6rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: #fff;
  margin-bottom: 1rem;

  em {
    font-style: italic;
    font-weight: 300;
  }
}

.case-hero-sub {
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.65);
  max-width: 520px;
  line-height: 1.7;
}

/* ── Page layout ── */

.case-layout {
  display: flex;
  align-items: flex-start;
  gap: 0;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 4vw 0 6vw;
  position: relative;
}

.case-main {
  flex: 1;
  min-width: 0;
  padding: 5rem 5rem 5rem 0;
}

.case-main .disclaimer-note {
  font-size: 0.75rem;
}

/* ── Anchor nav ── */

.anchor-nav {
  width: 200px;
  flex-shrink: 0;
  position: sticky;
  top: 6rem;
  align-self: flex-start;
  padding-top: 5rem;
}

.anchor-nav nav {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.anchor-link {
  display: flex;
  padding: 0.45rem 0;
  text-decoration: none;

  &:hover .anchor-label { color: var(--fg); }

  &.active .anchor-label {
    color: var(--fg);
    font-weight: 700;
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-thickness: 1.5px;
  }
}

.anchor-num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  padding: 0 0.5rem;
  line-height: 1.3;
}

.anchor-label {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 500;
  line-height: 1.3;
  transition: color 0.2s, font-weight 0.1s;
}

/* ── Section structure ── */

.case-section {
  padding: 4rem 0;
}

.section-intro {
  margin-bottom: 2.5rem;
}

.section-heading {
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 3vw, 2.6rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: var(--fg);
}

.section-divider {
  height: 1px;
  background: var(--border);
  margin: 0;
}

/* ── Section 1: Overview ── */

.overview-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 4rem;
  align-items: start;
}

.overview-meta {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  position: sticky;
  top: 7rem;
}

.meta-block {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.meta-key {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.meta-val {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--fg);
}

.meta-tags {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-top: 0.1rem;
}

.meta-tag {
  font-size: 0.82rem;
  color: var(--fg);
  font-weight: 400;
}

.overview-body {
  display: flex;
  flex-direction: column;
  gap: 1rem;

  p {
    font-size: 1rem;
    color: var(--muted);
    line-height: 1.8;
  }
}

.overview-img {
  width: 100%;
  border-radius: 14px;
  margin-top: 1.5rem;
  object-fit: cover;
  display: block;
}

/* ── Section 2: Goals ── */

.goals-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.goal-item {
  display: flex;
  gap: 2rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
  align-items: flex-start;

  &:first-child { border-top: 1px solid var(--border); }
}

.goal-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--muted);
  flex-shrink: 0;
  padding-top: 0.15rem;
  min-width: 2rem;
}

.goal-content {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.goal-title {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--fg);
  margin: 0;
}

.goal-desc {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.7;
  max-width: 540px;
  margin: 0;
}

/* ── Section 3: Principles ── */

.principles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  counter-reset: principles;
}

.principle-tile {
  background: var(--bg);
  padding: 2rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: background 0.2s;
  counter-increment: principles;

  &:hover { background: var(--card-bg); }
}

.principle-icon {
  background: none;
  border: none;
  border-radius: 0;
  width: auto;
  height: auto;
  display: block;
  color: var(--fg);
  flex-shrink: 0;

  svg { display: none; }

  &::before {
    content: counter(principles, decimal-leading-zero);
    font-family: var(--font-serif);
    font-size: 1.75rem;
    font-weight: 900;
    color: var(--fg);
    line-height: 1;
    letter-spacing: -0.04em;
  }
}

.principle-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--fg);
  margin: 0;
}

.principle-desc {
  font-size: 0.84rem;
  color: var(--muted);
  line-height: 1.65;
  margin: 0;
}

/* ── Image figures ── */

.case-figure {
  margin: 2.5rem 0;

  img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 6px;
  }
}

.case-figcaption {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.06em;
  margin-top: 0.75rem;
  padding-left: 0.25rem;
}

.case-figure-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin: 2.5rem 0;
}

/* ── Challenge block ── */

.challenge-block {
  padding: 1.5rem 2rem;
  margin: 2rem 0 3rem;
  border-radius: 0 6px 6px 0;
}

.challenge-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

.challenge-question {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-style: italic;
  font-weight: 300;
  line-height: 1.55;
  color: var(--fg);
  margin: 0;
}

/* ── Spec grid ── */

.spec-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin: 0 0 2.5rem;
}

.spec-block {
  padding-top: 1rem;
}

.spec-key {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.6rem;
}

.spec-val {
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--fg);
  margin: 0;
}

.spec-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;

  li {
    font-size: 0.875rem;
    line-height: 1.55;
    color: var(--fg);
    padding-left: 1rem;
    position: relative;

    &::before {
      content: '·';
      position: absolute;
      left: 0.1rem;
    }
  }
}

/* ── Case Study Responsive ── */

@media (max-width: 1024px) {
  .case-layout { padding: 0 5vw; }
  .anchor-nav { width: 160px; }
  .case-main { padding-right: 3rem; }
}

@media (max-width: 860px) {
  .anchor-nav { display: none; }
  .case-main { padding: 4rem 0; }

  .overview-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .overview-meta {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }

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

@media (max-width: 640px) {
  .case-figure-grid { grid-template-columns: 1fr; }
  .spec-grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .case-hero-title { font-size: 2.6rem; }
  .case-hero-overlay { padding: 0 5vw 3rem; }
  .principles-grid { grid-template-columns: 1fr; }
  .overview-meta { grid-template-columns: 1fr; }
  .case-nav-center { display: none; }
}