/* ==========================================================================
   kamal-mehta.com, version 7. Styles for the project stories: frames, the
   stage, the tour, progress and controls. Every color comes from tokens.css.
   ========================================================================== */

/* ---------- the story ---------- */
.km-story {
  position: relative;
  display: block;
  width: 100%;
  max-width: 1040px;
  margin-inline: auto;
  color: var(--text);
  font-family: var(--font-body);
}
.km-story--stage { max-width: 1120px; }
.km-frames {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 3vw, 32px);
}

/* ---------- one frame: a dark glass card with a chamfered corner ---------- */
.km-frame {
  position: relative;
  padding: 1px;
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  background: linear-gradient(135deg, var(--line-strong), var(--line) 42%, var(--line) 75%, var(--line-strong));
  transition: background var(--t-med) var(--ease);
}
.km-frame::before {
  content: "";
  position: absolute;
  inset: 1px;
  z-index: 0;
  background: var(--panel-solid);
  background-image: var(--grad-soft);
  background-blend-mode: soft-light;
  clip-path: polygon(0 0, calc(100% + 0.5px - var(--cut)) 0, 100% calc(var(--cut) - 0.5px), 100% 100%, 0 100%);
}
.km-frame > * { position: relative; z-index: 1; }
.km-frame__head,
.km-frame__line,
.km-frame__art { margin-inline: clamp(14px, 2.4vw, 26px); }
.km-frame__head { margin-top: clamp(14px, 2.2vw, 22px); }
.km-frame__art { margin-bottom: clamp(14px, 2.4vw, 26px); }
.km-frame.is-in { background: var(--grad); }

.km-frame__head {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 20px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 600;
  letter-spacing: var(--track-wide);
  text-transform: uppercase;
  color: var(--text-2);
}
.km-frame__step {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--text);
}
.km-frame__pip {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--accent);
  box-shadow: var(--glow);
}
.km-frame[data-step="problem"] .km-frame__pip { background: var(--warn); box-shadow: none; }
.km-frame[data-step="context"] .km-frame__pip { background: var(--accent-2); box-shadow: none; }
.km-frame[data-step="result"] .km-frame__pip { background: var(--accent-3); box-shadow: none; }
.km-frame__count { color: var(--text-3); }
.km-frame__tag {
  margin-left: auto;
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text-3);
}
.km-frame__line {
  margin-block: 10px 16px;
  max-width: 44ch;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 1.15rem + 0.6vw, 1.5rem);
  font-weight: 600;
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--text);
  text-wrap: balance;
}
.km-frame__art {
  position: relative;
  border-radius: var(--r-s);
  background-color: var(--bg-2);
  background-image: radial-gradient(circle at 1px 1px, var(--line) 1px, transparent 1.6px);
  background-size: 24px 24px;
  overflow: hidden;
}
.km-frame--noart .km-frame__art { display: none; }

/* ---------- the diagram itself ---------- */
.km-dg {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  overflow: visible;
}
.km-story--compact .km-dg {
  aspect-ratio: 7 / 9;
  max-width: 460px;
  margin-inline: auto;
}
.km-dg text {
  font-family: var(--font-body);
  user-select: none;
  -webkit-user-select: none;
}
.km-dg .km-t-body { font-family: var(--font-body); }
.km-dg .km-t-mono {
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.km-dg .km-t-display {
  font-family: var(--font-display);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}
.km-dg-unit { transition: fill var(--t-fast) linear, fill-opacity var(--t-fast) linear; }
.km-dg[data-still] .km-dg-minor { display: none; }

/* ---------- progress rail, scroll mode ---------- */
.km-rail {
  position: sticky;
  top: 0;
  z-index: 3;
  display: flex;
  gap: 4px;
  padding: 10px 0 12px;
}
.km-rail__seg {
  flex: 1 1 0;
  height: 2px;
  border-radius: 1px;
  background: var(--muted-mark);
  opacity: 0.55;
  transition: background var(--t-med) var(--ease), opacity var(--t-med) var(--ease);
}
.km-rail__seg.is-seen { background: var(--accent); opacity: 0.8; }
.km-rail__seg.is-now { background: var(--accent-3); opacity: 1; box-shadow: var(--glow); }

/* ---------- stage mode ---------- */
.km-story--stage { outline: none; }
.km-story--stage:focus-visible { outline: 2px solid var(--accent); outline-offset: 6px; border-radius: var(--r-s); }
.km-stage__view { position: relative; }
.km-story--stage .km-frame__art .km-dg { max-height: min(60vh, 640px); }
.km-story--stage .km-frame.is-in { animation: km-frame-in var(--t-med) var(--ease) both; }
@keyframes km-frame-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}
.km-stage__controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 16px;
}
.km-dots {
  list-style: none;
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0;
}
.km-dot {
  width: 30px;
  height: 30px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  position: relative;
  border-radius: 50%;
}
.km-dot::before {
  content: "";
  position: absolute;
  inset: 11px;
  border-radius: 50%;
  background: var(--muted-mark);
  transition: background var(--t-fast) linear, transform var(--t-fast) var(--ease);
}
.km-dot.is-seen::before { background: var(--text-3); }
.km-dot[aria-current="true"]::before { background: var(--accent); transform: scale(1.35); box-shadow: var(--glow); }
.km-dot:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }

/* ---------- buttons ---------- */
.km-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-s);
  background: var(--panel);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 600;
  letter-spacing: var(--track-wide);
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color var(--t-fast) linear, background var(--t-fast) linear, color var(--t-fast) linear;
}
.km-btn:hover { border-color: var(--accent); background: var(--panel-hi); }
.km-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.km-btn:disabled { opacity: 0.4; cursor: default; }
.km-btn--prev,
.km-btn--next { font-family: var(--font-display); font-size: 1.5rem; line-height: 1; padding: 0 0 3px; letter-spacing: 0; }
.km-btn--play { position: relative; }
.km-stage__controls .km-btn--play::before {
  content: "";
  width: 12px;
  height: 12px;
  border-inline: 3px solid var(--text);
  box-sizing: border-box;
}
.km-stage__controls .km-btn--play.is-paused::before {
  width: 0;
  height: 0;
  border-inline: 0;
  border-top: 7px solid transparent;
  border-bottom: 7px solid transparent;
  border-left: 12px solid var(--text);
  margin-left: 3px;
}
.km-sr {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- the tour ---------- */
.km-tour {
  display: grid;
  gap: 18px;
  width: 100%;
  max-width: 1120px;
  margin-inline: auto;
  color: var(--text);
}
.km-tour__head {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px 18px;
  align-items: end;
}
.km-tour__meta { min-width: 0; }
.km-tour__count,
.km-label {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 600;
  letter-spacing: var(--track-wide);
  text-transform: uppercase;
  color: var(--accent);
}
.km-tour__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 1rem + 1.2vw, 1.7rem);
  font-weight: 600;
  line-height: 1.2;
  text-wrap: balance;
}
.km-tour__org {
  margin: 6px 0 0;
  font-size: var(--fs-small);
  color: var(--text-2);
}
.km-tour__actions { display: flex; gap: 8px; }
.km-tour__progress {
  grid-column: 1 / -1;
  display: flex;
  gap: 5px;
}
.km-tour__seg {
  flex: 1 1 0;
  height: 3px;
  border-radius: 2px;
  background: var(--muted-mark);
  overflow: hidden;
}
.km-tour__fill {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--grad);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t-med) var(--ease);
}
.km-tour__stage[hidden] { display: none; }

.km-tour__end {
  position: relative;
  padding: clamp(22px, 4vw, 40px);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  background: var(--panel-solid);
  border: 1px solid var(--line);
}
.km-tour__end[hidden] { display: none; }
.km-tour__end-title {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  font-weight: 600;
  line-height: 1.15;
  outline: none;
}
.km-tour__end-title:focus-visible { outline: 2px solid var(--accent); outline-offset: 6px; }
.km-tour__list {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 10px;
}
.km-tour__item {
  display: grid;
  grid-template-columns: minmax(84px, auto) 1fr;
  gap: 14px;
  align-items: center;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-s);
  color: var(--text);
  text-decoration: none;
  transition: border-color var(--t-fast) linear, background var(--t-fast) linear;
}
.km-tour__item:hover { border-color: var(--accent); background: var(--panel-hi); }
.km-tour__item:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.km-tour__item-metric {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-3);
  font-variant-numeric: tabular-nums;
}
.km-tour__item-text { display: grid; gap: 3px; min-width: 0; }
.km-tour__item-title { font-size: var(--fs-small); font-weight: 600; line-height: 1.3; }
.km-tour__item-org { font-size: var(--fs-micro); color: var(--text-3); }

/* ---------- stills, for project cards ---------- */
.km-still { display: block; width: 100%; }
.km-still .km-dg { aspect-ratio: auto; }

/* ---------- small screens ---------- */
@media (max-width: 560px) {
  .km-frame__head,
  .km-frame__line,
  .km-frame__art { margin-inline: 12px; }
  .km-frame__head { margin-top: 12px; }
  .km-frame__art { margin-bottom: 12px; }
  .km-frame__line { margin-block: 8px 12px; }
  .km-tour__head { grid-template-columns: 1fr; align-items: start; }
  .km-tour__actions { flex-wrap: wrap; }
  .km-btn { padding: 0 12px; }
  .km-tour__list { grid-template-columns: 1fr; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .km-story--stage .km-frame.is-in { animation: none; }
  .km-rail__seg,
  .km-dot::before,
  .km-tour__fill,
  .km-frame,
  .km-dg-unit { transition: none; }
}