/* ---------- Font (local file, works offline) ---------- */
@font-face {
  font-family: "Public Sans";
  src: url("../fonts/public-sans.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

/* ---------- Tokens ---------- */
:root {
  --bg: #eef1f4;
  --surface: #ffffff;
  --ink: #1c2733;
  --muted: #5b6b7a;
  --line: #cfd6de;
  --accent: #1f5fad;
  --accent-ink: #ffffff;
  --done: #2e7d4f;
  --error: #b42318;
  --radius: 10px;
  --font: "Public Sans", "Segoe UI", system-ui, -apple-system, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141a21;
    --surface: #1d252e;
    --ink: #e6ebf0;
    --muted: #9aa8b6;
    --line: #34404c;
    --accent: #5b9be6;
    --accent-ink: #0d1620;
    --done: #5cb884;
    --error: #f2877c;
  }
}

/* ---------- Base ---------- */
[hidden] { display: none !important; }
*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.5;
}

.page {
  max-width: 52rem;
  margin: 0 auto;
  padding: 3rem 1.25rem 4rem;
}

.page-header h1 {
  font-size: clamp(1.6rem, 4vw, 2.1rem);
  font-weight: 800;
  line-height: 1.15;
  margin: 0 0 0.5rem;
}

.intro {
  color: var(--muted);
  max-width: 38rem;
  margin: 0 0 2rem;
}

/* ---------- Steps ---------- */
/* Each row holds a step box and, for some steps, a help panel. */
.step-row {
  position: relative;
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.step {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: opacity 0.25s ease, filter 0.25s ease, border-color 0.25s ease;
}

.step-number {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1rem 0.5rem;
  border-right: 1px solid var(--line);
  color: var(--muted);
}

.step-word {
  font-size: 0.85rem;
  font-weight: 500;
}

.step-digit {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.step-body {
  padding: 1.25rem 1.5rem;
}

.step-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0 0 0.25rem;
}

.step-desc {
  color: var(--muted);
  margin: 0 0 1rem;
  max-width: 36rem;
}

/* Expected file name hint (Steps 1 and 3). Any .xlsx with the right
   contents works; this just helps people find the usual download. */
.file-hint {
  color: var(--muted);
  font-size: 0.95rem;
  margin: -0.5rem 0 1rem;
  max-width: 36rem;
}
.filename {
  color: var(--ink);
  font-weight: 600;
  overflow-wrap: anywhere;
}

.step-control {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

/* Locked: greyed out and not interactive */
.step.is-locked {
  opacity: 0.45;
  filter: grayscale(1);
  pointer-events: none;
  user-select: none;
}

/* Active: the step the user is on now */
.step.is-active {
  border-color: var(--accent);
  box-shadow: inset 4px 0 0 var(--accent);
}
.step.is-active .step-number {
  color: var(--accent);
}

/* Complete: finished, still editable */
.step.is-complete .step-number {
  color: var(--done);
}
.step.is-complete .step-digit::after {
  content: "\2713";
  font-size: 1.1rem;
  margin-left: 0.15rem;
  vertical-align: super;
}

/* ---------- Controls ---------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.file-btn,
.primary-btn {
  display: inline-flex;
  align-items: center;
  font: inherit;
  font-weight: 600;
  padding: 0.6rem 1.1rem;
  border-radius: 6px;
  cursor: pointer;
}

.file-btn {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}
.file-btn:hover { background: color-mix(in srgb, var(--accent) 10%, transparent); }
.file-btn:focus-within {
  outline: 3px solid color-mix(in srgb, var(--accent) 45%, transparent);
  outline-offset: 2px;
}

.primary-btn {
  background: var(--accent);
  color: var(--accent-ink);
  border: 1.5px solid var(--accent);
}
.primary-btn:hover:not(:disabled) { filter: brightness(1.08); }
.primary-btn:disabled { cursor: not-allowed; opacity: 0.6; }

.file-name {
  color: var(--muted);
  font-size: 0.95rem;
  overflow-wrap: anywhere;
}
.file-name.has-file {
  color: var(--ink);
  font-weight: 500;
}

.select {
  font: inherit;
  color: var(--ink);
  background: var(--surface);
  border: 1.5px solid var(--line);
  border-radius: 6px;
  padding: 0.55rem 0.75rem;
  min-width: min(22rem, 100%);
  max-width: 100%;
}
.select:focus { border-color: var(--accent); }

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 45%, transparent);
  outline-offset: 2px;
}

/* ---------- Status messages ---------- */
.step-message {
  margin: 0.75rem 0 0;
  font-size: 0.95rem;
  color: var(--muted);
}
.step-message:empty { display: none; }
.step-message.is-success { color: var(--done); font-weight: 500; }
.step-message.is-error { color: var(--error); font-weight: 500; }

.program-details {
  margin: 0.75rem 0 0;
  font-size: 0.95rem;
  color: var(--muted);
}
.program-details:empty { display: none; }

/* ---------- Student preview ---------- */
.student-preview {
  margin-top: 0.75rem;
}
.student-preview summary {
  cursor: pointer;
  color: var(--accent);
  font-weight: 600;
  width: fit-content;
}
.table-wrap {
  overflow-x: auto;
  max-height: 20rem;
  overflow-y: auto;
  margin-top: 0.5rem;
  border: 1px solid var(--line);
  border-radius: 6px;
}
.student-preview table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}
.student-preview th,
.student-preview td {
  text-align: left;
  padding: 0.45rem 0.75rem;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.student-preview th {
  position: sticky;
  top: 0;
  background: var(--surface);
  font-weight: 600;
}
.student-preview tbody tr:last-child td { border-bottom: none; }

/* ---------- Help ("i") button and panel ---------- */
.step-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.info-btn {
  flex: none;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  border: 2px solid var(--accent);
  background: transparent;
  color: var(--accent);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.35rem;
  font-weight: 700;
  font-style: italic;
  line-height: 1;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: -0.2rem;
}
.info-btn:hover { background: color-mix(in srgb, var(--accent) 10%, transparent); }
.info-btn[aria-expanded="true"] {
  background: var(--accent);
  color: var(--accent-ink);
}

/* Help stays usable before a step is unlocked. */
.step.is-locked .info-btn { pointer-events: auto; }

.info-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-top: 4px solid var(--accent);
  border-radius: var(--radius);
  margin-top: 0.75rem;
  animation: panel-in 0.18s ease-out;
}

.info-panel-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1rem 1rem 0 1.25rem;
}

.info-panel-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0;
}

.info-close {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  margin: -0.25rem -0.25rem 0 0;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}
.info-close:hover { color: var(--ink); background: color-mix(in srgb, var(--ink) 8%, transparent); }

.info-panel-body {
  padding: 0.5rem 1.25rem 1.25rem;
  font-size: 0.95rem;
}
.info-panel-body p { margin: 0.6rem 0; }

/* Text links (e.g. the video link) stay inline with the paragraph. */
.info-panel-body p a,
.info-panel-body p a:visited {
  color: var(--accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
}
.info-panel-body p a:hover { text-decoration-thickness: 2px; }

/* "Click the image to enlarge it." hint, added by app.js */
.enlarge-hint {
  color: var(--muted);
  font-style: italic;
}

/* Image links (tagged by app.js) sit on their own line. */
.info-panel-body a.image-link {
  display: block;
  margin: 0.75rem 0;
  cursor: zoom-in;
}
.info-panel-body img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
}

@keyframes panel-in {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: none; }
}

/* Wide screens: widen the page so the panel sits to the right of its step. */
@media (min-width: 1200px) {
  .page {
    max-width: 75rem;
  }
  .page-header,
  .steps,
  .page-footer {
    max-width: 52rem;
  }
  .info-panel {
    position: absolute;
    top: 0;
    left: calc(100% + 1.25rem);
    width: 21rem;
    margin-top: 0;
    max-height: calc(100vh - 2rem);
    overflow-y: auto;
    z-index: 5;
    animation-name: panel-in-side;
  }
  @keyframes panel-in-side {
    from { opacity: 0; transform: translateX(-6px); }
    to   { opacity: 1; transform: none; }
  }
}

/* ---------- Enlarged image overlay ---------- */
.lightbox {
  width: 100vw;
  height: 100vh;
  max-width: 100vw;
  max-height: 100vh;
  margin: 0;
  padding: 0;
  border: none;
  background: transparent;
  cursor: zoom-out; /* clicking outside the image closes it */
}
.lightbox[open] {
  display: flex;
  align-items: center;
  justify-content: center;
}
.lightbox::backdrop {
  background: rgba(8, 12, 18, 0.82);
}
.lightbox img {
  display: block;
  max-width: 94vw;
  max-height: 92vh;
  width: auto;
  height: auto;
  border-radius: 6px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  background: #fff;
  cursor: default;
}

/* ---------- Footer ---------- */
.page-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  align-items: center;
  gap: 0.5rem 1rem;
  margin-top: 1.5rem;
}

.text-btn {
  font: inherit;
  color: var(--accent);
  background: none;
  border: none;
  padding: 0.25rem 0;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.privacy-note {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0;
}

/* ---------- Small screens ---------- */
@media (max-width: 560px) {
  .step { grid-template-columns: 4.5rem 1fr; }
  .step-digit { font-size: 2.25rem; }
  .step-body { padding: 1rem; }
}

@media (prefers-reduced-motion: reduce) {
  .step { transition: none; }
  .info-panel { animation: none; }
}