/* Case study layout on the new design system (Nebula, zDirect). Requires tokens.css and shell.css.
   Built from the Nebula Figma design (node 1161:5628); see docs/facelift-audit.md sections 15 and 16.
   Each page adds a small stylesheet of its own (nebula.css, zdirect.css) and assets/js/case-study.js.
   The older case-study.css stays for menapay.html and parentapp.html, which are not on this design. */

:root {
  --nav-h: calc(var(--nav-py) * 2 + 24px); /* sticky nav bar: padding plus the 24px chevrons */
  --cs-column: 588px;                      /* 6 grid columns: 6 x 78 + 5 x 24 */
  --cs-outline: 282px;                     /* 3 grid columns */
  --cs-stat-num: 82px;                     /* stat number column; pages with wider numbers override it */
}

html { scroll-behavior: smooth; }
[id] { scroll-margin-top: calc(var(--nav-h) + var(--space-24)); }

/* Hero */
.cs-hero { display: flex; flex-direction: column; gap: var(--space-96); padding-block: var(--space-96); }
.cs-hero__intro { display: flex; flex-direction: column; gap: var(--space-16); }
.cs-hero__logo { align-self: flex-start; width: auto; } /* each page sets its logo size */
.cs-hero__body { display: flex; flex-direction: column; gap: 48px; max-width: var(--cs-column); font: var(--text-hero-body); color: var(--color-secondary); }

.cs-meta { display: grid; grid-template-columns: repeat(6, 1fr); column-gap: var(--grid-gutter); row-gap: var(--space-48); }
.cs-meta__item { display: flex; flex-direction: column; gap: var(--space-16); }
.cs-meta__item--tools { grid-column: span 2; }
.cs-meta dt { font: var(--text-label); color: var(--color-primary); }
.cs-meta dd { font: var(--text-card-body); color: var(--color-secondary); }

/* Tool pills with tooltips */
.tool-pills { display: flex; flex-wrap: wrap; gap: var(--space-16); max-width: 280px; }
.tool-pill {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  font: var(--text-label);
  color: var(--color-tertiary);
  text-transform: uppercase;
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-pill);
  cursor: default;
  transition: border-color 0.15s;
}
.tool-pill:hover, .tool-pill.tip-visible { border-color: var(--color-tertiary); }
.tool-pill svg { width: 16px; height: 16px; flex: none; color: var(--color-primary); }
.tool-tip {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 0;
  z-index: 20;
  width: 240px;
  padding: var(--space-16);
  font: var(--text-card-small-body);
  line-height: 1.5;
  color: var(--color-secondary);
  text-transform: none;
  background: var(--gradient-card);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-card);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.1s;
}
.tool-pill.tip-visible .tool-tip { opacity: 1; }

/* Body: outline rail on the left, content column centered (grid columns 4 to 9 on desktop) */
.cs-body { position: relative; container-type: inline-size; padding-bottom: var(--space-96); }
.cs-content { display: flex; flex-direction: column; gap: var(--space-96); width: min(var(--cs-column), 100%); margin-inline: auto; }

.cs-outline-rail { position: absolute; top: 0; bottom: 0; left: var(--page-margin); width: var(--cs-outline); }
.cs-outline {
  position: sticky;
  top: calc(var(--nav-h) + var(--space-24));
  display: flex;
  flex-direction: column;
  gap: var(--space-24);
  padding: var(--space-24);
  transition: opacity 0.2s, border-color 0.15s;
}
.cs-outline.is-hidden { opacity: 0; pointer-events: none; }
.cs-outline__title { font: var(--text-h2); color: var(--color-primary); }
.cs-outline ol { display: flex; flex-direction: column; gap: 6px; list-style: none; }
.cs-outline a { display: flex; gap: var(--space-24); font: var(--text-label); color: var(--color-tertiary); text-transform: uppercase; transition: color 0.15s; }
.cs-outline a span { width: 9px; flex: none; }
.cs-outline a:hover { color: var(--color-secondary); }
.cs-outline a.active { color: var(--color-primary); }

/* Sections and steps */
.cs-section, .cs-step { display: flex; flex-direction: column; gap: var(--space-24); }
.cs-label { font: var(--text-label); color: var(--color-tertiary); text-transform: uppercase; }
.cs-title { font: var(--text-h1); color: var(--color-primary); }
.cs-title--split { display: flex; flex-direction: column; gap: 30px; } /* two-line headline, gap measured from Figma */
.cs-title + .cs-prose { margin-top: calc(var(--space-16) - var(--space-24)); }
.cs-prose { display: flex; flex-direction: column; gap: 32px; font: var(--text-card-body); color: var(--color-secondary); }
.cs-steps-wrap { display: flex; flex-direction: column; gap: var(--space-96); }
.cs-divider { border: 0; border-top: var(--border-width) solid var(--color-border); }

/* Cards */
.cs-card { display: flex; flex-direction: column; gap: var(--space-16); padding: var(--space-48); }
.cs-card .cs-label { margin-bottom: 8px; } /* 24px from label to title */
.cs-card__title { font: var(--text-h2); color: var(--color-primary); }
.cs-card__body { font: var(--text-card-small-body); color: var(--color-secondary); }
.cs-download { display: inline-flex; align-items: center; gap: var(--space-16); align-self: flex-start; margin-top: 8px; font: var(--text-link); color: var(--color-primary); transition: color 0.15s; }
.cs-download svg { width: 24px; height: 24px; flex: none; }
.cs-download:hover { color: var(--color-secondary); }

/* Stats */
.cs-stat { display: flex; align-items: center; gap: var(--space-16); padding: var(--space-48); }
.cs-stat__num { flex: none; min-width: var(--cs-stat-num); font: var(--text-impact); color: var(--color-primary); text-align: center; }
.cs-stat__text { font: var(--text-card-small-body); color: var(--color-tertiary); }

/* Numbered stepper; --detailed adds a title and paragraph per step */
.cs-stepper { display: flex; flex-direction: column; gap: var(--space-24); list-style: none; }
.cs-stepper li { position: relative; display: flex; align-items: center; gap: var(--space-16); font: var(--text-card-small-body); color: var(--color-secondary); }
.cs-stepper__num {
  flex: none;
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  color: var(--color-tertiary);
  border: var(--border-width) solid var(--color-border);
  border-radius: 50%;
}
.cs-stepper li:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 32px;
  left: 15.5px;
  width: var(--border-width);
  bottom: calc(var(--space-24) * -1); /* runs down to the next circle */
  background: var(--color-border);
}
.cs-stepper--detailed li { align-items: flex-start; }
.cs-stepper__text { display: flex; flex-direction: column; gap: 8px; padding-top: 5px; }
.cs-stepper__title { font: var(--text-h2); color: var(--color-primary); }
.cs-stepper__body { font: var(--text-card-small-body); color: var(--color-secondary); }

/* Media */
.cs-figure { display: flex; flex-direction: column; align-items: center; gap: var(--space-16); }
.cs-caption { font: var(--text-card-small-body); color: var(--color-primary); text-align: center; }
.cs-bleed { width: 100cqw; margin-inline: calc((100% - 100cqw) / 2); }
.cs-bleed img { width: 100%; height: auto; border-radius: var(--radius-card); }
.group-trigger { cursor: zoom-in; }

/* Tabs */
.cs-tabs { display: flex; flex-wrap: wrap; column-gap: var(--space-16); row-gap: 8px; margin-top: var(--space-24); } /* 48px below the text */
.cs-tab {
  padding-bottom: 7px;
  font: var(--text-link);
  color: var(--color-tertiary);
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}
.cs-tab:hover { color: var(--color-secondary); }
.cs-tab[aria-selected="true"] { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.cs-tab:focus-visible { outline: 1px solid var(--color-secondary); outline-offset: 4px; }
.cs-tabpanel { margin-top: var(--space-24); } /* 48px below the tabs */

.cs-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-24); align-items: start; }
.cs-grid--1 { grid-template-columns: 1fr; }
.cs-grid--3 { grid-template-columns: repeat(3, 1fr); }
.cs-grid img { width: 100%; height: auto; }
.cs-shot { border-radius: var(--radius-card); }

/* Finding/decision pairs next to a screenshot: text sticks in the outline's 3 columns, the screen takes the other 9.
   Used inside a full-width (.cs-bleed) panel, so the outline fades out while it passes. */
.cs-finding { display: grid; grid-template-columns: var(--cs-outline) var(--cs-column); gap: var(--grid-gutter); align-items: start; }
.cs-finding__text { position: sticky; top: calc(var(--nav-h) + var(--space-24)); display: flex; flex-direction: column; gap: var(--space-24); }
.cs-finding .cs-card { padding: var(--space-24); }
.cs-finding__screen img { width: 100%; height: auto; }

/* Three overlapping phones: the first image is in front, the others peek out at the sides */
.cs-stack { position: relative; width: 100%; aspect-ratio: 588 / 845; }
.cs-stack img { position: absolute; object-fit: cover; object-position: top; border-radius: var(--radius-card); }
.cs-stack img:nth-child(1) { z-index: 1; top: 0; left: 16.84%; width: 66.33%; height: 100%; }
.cs-stack img:nth-child(2),
.cs-stack img:nth-child(3) { top: 14.2%; width: 47.62%; height: 71.6%; }
.cs-stack img:nth-child(2) { left: 0; }
.cs-stack img:nth-child(3) { right: 0; }

/* Lightbox: click any image in a group to see the whole group enlarged */
.group-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--space-48);
  background: rgba(10, 10, 10, 0.85);
}
.group-modal-overlay.open { display: flex; }
.group-modal-card {
  position: relative;
  max-width: 100%;
  max-height: 100%;
  overflow: auto;
  padding: var(--space-48) var(--space-24) var(--space-24);
  background: var(--gradient-card);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-card);
}
.group-modal-close { position: absolute; top: var(--space-16); right: var(--space-16); display: inline-flex; padding: 0; }
.group-modal-close img { width: 24px; height: 24px; transition: filter 0.15s; }
.group-modal-close:hover img { filter: brightness(0.8); }
.group-modal-row { display: flex; align-items: flex-start; gap: var(--space-16); }
.group-modal-row img { flex: none; width: 320px; height: auto; border-radius: var(--radius-card); }
.group-modal-row img.group-modal-landscape { width: auto; max-width: 85vw; }

/* Provisional responsive behavior (no tablet or mobile case study design yet) */
@media (max-width: 1199px) {
  /* The outline becomes a sticky, sideways-scrolling strip under the nav */
  .cs-outline-rail { position: sticky; top: var(--nav-h); z-index: 10; left: auto; width: auto; margin-bottom: var(--space-48); background: var(--color-page); }
  .cs-outline { position: static; flex-direction: row; padding: 0; background: none; border: 0; border-bottom: var(--border-width) solid var(--color-border); border-radius: 0; }
  .cs-outline:hover { border-color: var(--color-border); }
  .cs-outline__title { display: none; }
  .cs-outline ol { flex-direction: row; gap: var(--space-24); padding-block: var(--space-16); overflow-x: auto; scrollbar-width: none; }
  .cs-outline a { gap: 8px; white-space: nowrap; }
  .cs-outline a span { width: auto; }
  [id] { scroll-margin-top: calc(var(--nav-h) + 51px + var(--space-24)); } /* nav plus the outline strip */
  .cs-meta { grid-template-columns: repeat(4, 1fr); }
  .cs-meta__item--tools { grid-column: 1 / -1; }
  /* Content column left-aligned with the hero; full-width images run to the right margin */
  .cs-content { margin-inline: 0; }
  .cs-bleed { margin-inline: 0 calc(100% - 100cqw); }
  .cs-finding { grid-template-columns: 1fr; }
  .cs-finding__text { position: static; }
}

@media (max-width: 767px) {
  :root { --text-hero-body: 400 18px/28px var(--font-sans); --text-impact: 700 32px/normal var(--font-sans); }
  .cs-hero { gap: var(--space-48); padding-block: var(--space-48); }
  .cs-hero__body { gap: 28px; }
  .cs-meta { grid-template-columns: repeat(2, 1fr); gap: var(--space-24) var(--grid-gutter); }
  .cs-content, .cs-steps-wrap { gap: var(--space-48); }
  .cs-card, .cs-stat { padding: var(--space-24); }
  :root { --cs-stat-num: 56px; }
  .cs-grid { gap: var(--space-16); }
  .group-modal-overlay { padding: var(--space-16); }
  .group-modal-row img { width: 260px; }
}