/* =====================================================================
   Case study pages — shared styles (work/*.html)
   Matches the warm paper aesthetic of index.html
   ===================================================================== */

:root {
  --cream: #F5EEE1;
  --cream-deep: #EDE2D0;
  --cream-aged: #E8DCC5;
  --peach: #E8A57E;
  --peach-soft: #F2C9AE;
  --sky: #B8CFD9;
  --sky-deep: #7FA3B3;
  --moss: #9CAE8E;
  --butter: #E8CA87;
  --ink: #3A2E26;
  --ink-soft: #6B5A4D;
  --ink-faded: #9C8874;

  --font-serif: 'Fraunces', Georgia, serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;
  --font-hand: 'Caveat', 'Brush Script MT', cursive;
}

body.evening {
  --cream: #E8D8B8;
  --cream-deep: #DCCAA8;
  --cream-aged: #CFB98E;
  --peach: #C77A4E;
  --peach-soft: #D9A078;
  --sky: #8FA5AE;
  --sky-deep: #5F7C8C;
  --moss: #798970;
  --butter: #C9A35C;
  --ink: #2A1F17;
  --ink-soft: #4D3E30;
  --ink-faded: #7A6851;
}

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

html, body {
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-mono);
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  background-image:
    radial-gradient(ellipse at 20% 30%, rgba(255,230,200,0.4) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 70%, rgba(184,207,217,0.2) 0%, transparent 50%);
  background-attachment: fixed;
}

body, body *:not(.obj) {
  transition: background-color 0.6s ease, color 0.6s ease, border-color 0.6s ease, fill 0.6s ease;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(58,46,38,0.035) 1px, transparent 1px);
  background-size: 24px 24px;
  opacity: 0.6;
}

/* ------------------------------------------------------------------
   Top nav — matches index.html
   ------------------------------------------------------------------ */
.topnav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 20px 2.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background 0.35s ease, backdrop-filter 0.35s ease, padding 0.25s ease, border-bottom 0.35s ease;
  background: transparent;
  border-bottom: 0.5px solid transparent;
}
.topnav.scrolled {
  background: rgba(245, 238, 225, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 14px 2.5rem;
  border-bottom: 0.5px solid rgba(58,46,38,0.12);
}
body.evening .topnav.scrolled { background: rgba(232, 216, 184, 0.82); }

.topnav-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.04em;
  text-transform: lowercase;
  color: var(--ink);
  text-decoration: none;
  cursor: pointer;
}
.topnav-brand .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--peach);
  flex-shrink: 0;
}

.topnav-links {
  display: flex;
  align-items: center;
  gap: 10px;
}
.topnav-links a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.02em;
  text-transform: lowercase;
  color: var(--ink);
  text-decoration: none;
  background: transparent;
  border: 1px solid rgba(228, 140, 100, 0.55);
  border-radius: 999px;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  white-space: nowrap;
}
.topnav-links a:hover {
  background: var(--peach);
  border-color: var(--peach);
  color: #FFFFFF;
}
.topnav-links a .arrow {
  display: inline-block;
  transition: transform 0.25s ease;
  font-size: 11px;
  line-height: 1;
}
.topnav-links a:hover .arrow { transform: translate(2px, -2px); }

/* Back-affordance on the brand — case study specific */
.topnav-brand .back-arrow {
  font-family: var(--font-mono);
  color: var(--ink-faded);
  font-size: 14px;
  line-height: 1;
  transition: transform 0.25s ease, color 0.25s ease;
}
.topnav-brand:hover .back-arrow {
  transform: translateX(-3px);
  color: var(--peach);
}

@media (max-width: 820px) {
  .topnav { padding: 14px 1.25rem; }
  .topnav.scrolled { padding: 12px 1.25rem; }
  .topnav-links { gap: 6px; }
  .topnav-links a { padding: 5px 12px; font-size: 11px; }
  .topnav-links a[data-hide-mobile] { display: none; }
  .topnav-brand { font-size: 12px; }
}
@media (max-width: 560px) {
  .topnav-links a:not(.topnav-cta-pill) { display: none; }
}

/* ------------------------------------------------------------------
   Left-side table of contents — desktop only
   ------------------------------------------------------------------ */
.cs-toc {
  position: fixed;
  left: clamp(1.75rem, 4vw, 3.5rem);
  top: 50%;
  transform: translateY(-50%);
  z-index: 90;
  max-width: 200px;
}
.cs-toc-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-faded);
  margin-bottom: 1rem;
  padding-left: 16px;
}
.cs-toc ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
}
.cs-toc li { position: relative; }
.cs-toc a {
  position: relative;
  display: block;
  padding: 5px 0 5px 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  text-decoration: none;
  line-height: 1.45;
  transition: color 0.25s ease, padding-left 0.25s ease;
}
.cs-toc a::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 1.5px;
  background: var(--peach);
  transition: width 0.3s cubic-bezier(0.2, 0.7, 0.2, 1);
}
.cs-toc a:hover {
  color: var(--ink);
}
.cs-toc a.is-active {
  color: var(--peach);
  padding-left: 26px;
  font-weight: 600;
}
.cs-toc a.is-active::before {
  width: 18px;
}

/* Hide below wide desktop — below this, TOC would overlap content */
@media (max-width: 1280px) {
  .cs-toc { display: none; }
}

/* ------------------------------------------------------------------
   Reading progress bar
   ------------------------------------------------------------------ */
.cs-progress {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 0;
  background: var(--peach);
  z-index: 150;
  transition: width 0.08s linear;
  pointer-events: none;
}

/* ------------------------------------------------------------------
   Case study layout
   ------------------------------------------------------------------ */
.cs-main {
  position: relative;
  z-index: 1;
}

.cs-wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 clamp(1.5rem, 4vw, 3rem);
}

/* Hero ------------------------------------------------------------- */
.cs-hero {
  padding: clamp(8rem, 16vh, 12rem) 0 clamp(3rem, 6vh, 5rem);
}

.cs-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-faded);
  margin-bottom: 1.5rem;
}

.cs-title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 1.75rem;
}
.cs-title em {
  font-style: normal;
  color: var(--peach);
  font-weight: 500;
}

.cs-intro {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 400;
  color: var(--ink-soft);
  line-height: 1.75;
  margin-bottom: 1rem;
  max-width: 620px;
}
.cs-intro strong { color: var(--ink); font-weight: 500; }

.cs-velocity {
  font-family: var(--font-hand);
  font-size: 20px;
  color: var(--ink);
  margin: 1.5rem 0 0;
  line-height: 1.4;
}

.cs-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 3rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 0.5px solid rgba(58, 46, 38, 0.15);
}
.cs-meta-item { display: flex; flex-direction: column; gap: 4px; }
.cs-meta-label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 400;
  color: var(--ink-faded);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.cs-meta-value {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink);
  letter-spacing: 0.01em;
}

/* Sections --------------------------------------------------------- */
.cs-section {
  padding: clamp(3rem, 6vh, 5rem) 0;
}
.cs-section + .cs-section {
  position: relative;
}
.cs-section + .cs-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 0.5px;
  background: rgba(58, 46, 38, 0.12);
}
/* Above 1280px, TOC is visible on the left — inset the divider so it starts past it */
@media (min-width: 1281px) {
  .cs-section + .cs-section::before {
    left: 280px;
  }
}

.cs-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  color: var(--peach);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.cs-heading {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(28px, 3.2vw, 38px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: 1.25rem;
}

.cs-sub-heading {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(20px, 2vw, 24px);
  line-height: 1.3;
  color: var(--ink);
  margin: 2.5rem 0 0.75rem;
}

.cs-sub-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-faded);
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.cs-body p {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.75;
  margin-bottom: 1rem;
  max-width: 620px;
}
.cs-body p:last-child { margin-bottom: 0; }
.cs-body strong { color: var(--ink); font-weight: 500; }
.cs-body em { font-style: italic; }

/* Em-dash bullet list --------------------------------------------- */
.cs-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin: 1.25rem 0;
  max-width: 620px;
}
.cs-list li {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
  padding-left: 1.5rem;
  position: relative;
}
.cs-list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--peach);
  font-family: var(--font-mono);
}
.cs-list li strong { color: var(--ink); font-weight: 500; }
.cs-list li em { font-style: italic; }

/* Pull quote in Caveat -------------------------------------------- */
.cs-pullquote {
  font-family: var(--font-hand);
  font-size: clamp(22px, 2.5vw, 28px);
  line-height: 1.3;
  color: var(--ink);
  border-left: 2px solid var(--peach);
  padding: 0.5rem 0 0.5rem 1.5rem;
  margin: 2rem 0;
  max-width: 620px;
}

/* Workflow chips -------------------------------------------------- */
.cs-workflow {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.5rem 0;
  align-items: center;
}
.cs-workflow-step {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: 0.02em;
  padding: 0.55rem 0.9rem;
  background: var(--cream-aged);
  border: 0.5px solid rgba(58, 46, 38, 0.15);
  border-radius: 4px;
}
.cs-workflow-arrow {
  color: var(--peach);
  font-size: 14px;
  font-family: var(--font-mono);
}

/* Image galleries — paper frame aesthetic ------------------------- */
.cs-gallery { margin-top: 2.5rem; }

.cs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  align-items: start;
}
.cs-grid + .cs-grid { margin-top: 1rem; }
.cs-grid--single { grid-template-columns: 1fr; max-width: 620px; margin-left: auto; margin-right: auto; }

.cs-screen {
  overflow: hidden;
  border-radius: 12px;
  box-shadow:
    0 1px 2px rgba(58, 46, 38, 0.08),
    0 4px 14px rgba(58, 46, 38, 0.1);
  transition: transform 0.45s cubic-bezier(0.2, 0.7, 0.2, 1), box-shadow 0.4s ease;
}
.cs-screen:hover {
  transform: translateY(-3px) rotate(-0.4deg);
  box-shadow:
    0 2px 4px rgba(58, 46, 38, 0.1),
    0 10px 24px rgba(58, 46, 38, 0.18);
}
.cs-screen img {
  width: 100%;
  height: auto;
  display: block;
}

/* Single centered phone-sized screen (used on speculative / mobile case studies) */
.cs-screen--single {
  max-width: 280px;
  margin-left: auto;
  margin-right: auto;
  border-radius: 32px;
}
.cs-screen--single img {
  border-radius: 32px;
}

/* Placeholder screen (for missing images) ------------------------- */
.cs-screen--placeholder {
  aspect-ratio: 16 / 10;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--cream-aged);
  padding: 1rem;
}
.cs-screen--placeholder::after {
  content: attr(data-placeholder);
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-faded);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-align: center;
}

/* Next project card ----------------------------------------------- */
.cs-next {
  padding: clamp(4rem, 8vh, 6rem) 0;
  text-align: center;
  position: relative;
}
.cs-next::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 0.5px;
  background: rgba(58, 46, 38, 0.12);
}
@media (min-width: 1281px) {
  .cs-next::before { left: 280px; }
}
.cs-next-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-faded);
  margin-bottom: 1rem;
}
.cs-next-link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--ink);
  padding: 0.5rem 0;
}
.cs-next-link .title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.01em;
  line-height: 1.1;
  border-bottom: 0.5px solid var(--peach);
  padding-bottom: 4px;
  transition: color 0.25s ease;
}
.cs-next-link:hover .title { color: var(--peach); }
.cs-next-link .arrow {
  color: var(--peach);
  font-family: var(--font-mono);
  transition: transform 0.3s ease;
}
.cs-next-link:hover .arrow { transform: translate(4px, -2px); }

/* Back link (bottom) ---------------------------------------------- */
.cs-back {
  padding: clamp(2rem, 4vh, 3rem) 0;
  text-align: center;
}
.cs-back a {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-faded);
  text-decoration: none;
  transition: color 0.25s ease;
}
.cs-back a:hover { color: var(--ink); }

/* Footer ---------------------------------------------------------- */
.cs-footer {
  padding: 4rem 3rem 3rem;
  text-align: center;
  margin-top: 2rem;
  position: relative;
  z-index: 1;
}
.cs-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 0.5px;
  background: rgba(58, 46, 38, 0.2);
  background-image: linear-gradient(90deg, rgba(58,46,38,0.3) 50%, transparent 50%);
  background-size: 8px 0.5px;
  background-repeat: repeat-x;
}
@media (min-width: 1281px) {
  .cs-footer::before { left: 280px; }
}
.cs-footer-line {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: 1.5rem;
}
.cs-footer-email {
  font-family: var(--font-serif);
  font-size: 17px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 0.5px solid var(--peach);
  padding-bottom: 2px;
}
.cs-footer-email:hover { color: var(--peach); }
.cs-footer-contact-row {
  margin-top: 2rem;
  display: flex;
  justify-content: center;
  gap: 16px;
}
.cs-footer-contact-row a {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-soft);
  letter-spacing: 0.1em;
  text-decoration: none;
}
.cs-footer-credits {
  margin-top: 4rem;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--ink-faded);
}

/* Reveal animation (triggered by intersection observer) ----------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s cubic-bezier(0.2, 0.7, 0.2, 1),
              transform 0.7s cubic-bezier(0.2, 0.7, 0.2, 1);
}
[data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  .cs-screen { transition: none; }
  html, body { scroll-behavior: auto; }
}

/* Responsive ------------------------------------------------------ */
@media (max-width: 767px) {
  .cs-grid { grid-template-columns: 1fr; }
  .cs-workflow { flex-direction: column; align-items: flex-start; }
  .cs-workflow-arrow { transform: rotate(90deg); }
  .cs-meta { gap: 1rem 2rem; }
  .cs-footer { padding: 3rem 1.5rem 2rem; }
}