/* Night Session (js/rhythm.js): a full-screen <dialog>. The highway is a band of four lanes
   leaning at the major angle; notes (canvas) ride it right to left into the hit line. */

.session {
  position: fixed;
  inset: 0;
  width: 100%;
  max-width: none;
  height: 100%;
  max-height: none;
  margin: 0;
  padding: 0;
  border: 0;
  color: var(--paper);
  background: transparent;
  overflow: hidden;
  font-family: var(--font-hud);
}

.session::backdrop {
  background: transparent;
}

.session__veil {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 70% 40%, color-mix(in srgb, var(--deep) 45%, transparent), transparent 60%),
    linear-gradient(180deg, color-mix(in srgb, var(--ink) 96%, transparent), color-mix(in srgb, var(--abyss) 97%, transparent));
}

.session__stage {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: auto minmax(0, 1fr) auto auto;
  grid-template-areas: "head" "track" "pads" "panel";
  height: 100%;
  padding: var(--s-6) clamp(var(--s-5), 5vw, var(--s-9)) var(--s-7);
}

/* ------------------------------------------------------------------- head */

.session__head {
  grid-area: head;
  display: flex;
  align-items: center;
  gap: var(--s-5);
}

.session__kicker {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  margin: 0;
  color: var(--cyan);
  font-size: var(--fs-sm);
  font-weight: 800;
  font-style: italic;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  white-space: nowrap;
}

.session__kicker::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--red);
  rotate: 45deg;
}

.session__bar {
  padding: 3px 10px 2px 12px;
  color: var(--ink);
  background: var(--paper);
  font-variant-numeric: tabular-nums;
  clip-path: polygon(4px 0, 100% 0, calc(100% - 4px) 100%, 0 100%);
}

.session__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--fs-2xl);
  font-weight: 400;
  line-height: 0.86;
  text-transform: uppercase;
}

.session__score {
  display: flex;
  align-items: baseline;
  gap: var(--s-2);
  margin: 0 0 0 auto;
  color: var(--text-2);
  font-size: var(--fs-sm);
  font-weight: 800;
  font-style: italic;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.session__score b {
  min-width: 6ch;
  color: var(--paper);
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-style: normal;
  letter-spacing: 0;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.session__quit {
  all: unset;
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  min-height: 44px;
  padding: 0 var(--s-4);
  color: var(--text-2);
  font-size: var(--fs-sm);
  font-weight: 800;
  font-style: italic;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color var(--dur-1) linear;
}

.session__quit:hover,
.session__quit:focus-visible {
  color: var(--paper);
  box-shadow: inset 0 -2px 0 var(--hot);
}

.session__key {
  padding: 2px 6px;
  color: var(--ink);
  background: var(--text-2);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
}

/* ---------------------------------------------------------------- highway */

.session__track {
  grid-area: track;
  position: relative;
  display: grid;
  place-items: center;
  min-height: 0;
  opacity: 0.35;
  transition: opacity var(--dur-3) var(--ease-out);
}

.session__track.is-live {
  opacity: 1;
}

.session__highway {
  --lane-h: clamp(48px, 8vh, 72px);
  position: relative;
  width: 112vw;
  height: calc(var(--lane-h) * 4);
  rotate: var(--tilt-major);
  will-change: transform;
}

.session__lanes {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-rows: repeat(4, 1fr);
  background: color-mix(in srgb, var(--night) 80%, transparent);
  box-shadow:
    inset 0 2px 0 color-mix(in srgb, var(--cyan) 55%, transparent),
    inset 0 -2px 0 color-mix(in srgb, var(--cyan) 55%, transparent);
}

.session__lane {
  border-bottom: 1px solid var(--line);
}

.session__lane:nth-child(even) {
  background: color-mix(in srgb, var(--deep) 30%, transparent);
}

.session__lane:last-child {
  border-bottom: 0;
}

.session__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

/* Hit line at 14% (max 140px) of the highway: rhythm.js uses the same x. */
.session__hitline {
  position: absolute;
  top: -10px;
  bottom: -10px;
  left: min(140px, 14%);
  width: 3px;
  margin-left: -1.5px;
  background: var(--paper);
  box-shadow: 0 0 14px color-mix(in srgb, var(--cyan) 70%, transparent);
}

.session__caps {
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(min(140px, 14%) - 92px);
  display: grid;
  grid-template-rows: repeat(4, 1fr);
  width: 64px;
}

.session__cap {
  display: grid;
  place-items: center;
  margin: 6px 0;
  color: var(--text-2);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--paper) 24%, transparent);
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  line-height: 1;
  clip-path: polygon(6px 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
  transition: background-color var(--dur-1) linear, color var(--dur-1) linear;
}

.session__cap.is-down {
  color: var(--ink);
  background: var(--hot);
  transition: none;
}

.session__judge {
  position: absolute;
  left: 18%;
  top: calc(50% - var(--s-9) * 2.2);
  margin: 0;
  padding: 4px 16px 2px 18px;
  color: var(--ink);
  background: var(--paper);
  font-size: var(--fs-lg);
  font-weight: 800;
  font-style: italic;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  rotate: var(--tilt-major);
  opacity: 0;
  clip-path: polygon(6px 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
}

.session__judge[data-kind="perfect"] { background: var(--gold); }
.session__judge[data-kind="great"] { background: var(--cyan); }
.session__judge[data-kind="miss"] { color: var(--paper); background: var(--red); }

.session__combo {
  position: absolute;
  right: 6%;
  top: calc(50% + var(--s-9) * 1.6);
  display: grid;
  justify-items: end;
  margin: 0;
  opacity: 0;
  rotate: var(--tilt-major);
  transition: opacity var(--dur-2) linear;
}

.session__combo.is-on {
  opacity: 1;
}

.session__combo b {
  color: var(--paper);
  font-family: var(--font-display);
  font-size: var(--fs-3xl);
  line-height: 0.86;
  text-shadow: 4px 4px 0 var(--ink);
  font-variant-numeric: tabular-nums;
}

.session__combo span {
  color: var(--cyan);
  font-size: var(--fs-xs);
  font-weight: 800;
  font-style: italic;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.session__status {
  position: absolute;
  left: 50%;
  top: 50%;
  translate: -50% -50%;
  margin: 0;
  padding: var(--s-2) var(--s-5);
  color: var(--paper);
  background: color-mix(in srgb, var(--ink) 80%, transparent);
  font-size: var(--fs-lg);
  font-weight: 800;
  font-style: italic;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-align: center;
  rotate: var(--tilt-major);
}

.session__status[hidden],
.session__status:empty {
  display: none;
}

/* ------------------------------------------------------------------- pads */

/* Touch screens: four big pads under the highway (keys elsewhere). */
.session__pads {
  grid-area: pads;
  display: none;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--s-2);
  margin-top: var(--s-4);
}

.session__track.is-live ~ .session__pads {
  display: grid;
}

@media (pointer: fine) {
  .session__track.is-live ~ .session__pads {
    display: none;
  }
}

.session__pad {
  all: unset;
  display: grid;
  place-items: center;
  min-height: 64px;
  color: var(--paper);
  background: color-mix(in srgb, var(--deep) 70%, transparent);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--cyan) 30%, transparent);
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.session__pad:active {
  color: var(--ink);
  background: var(--hot);
}

.session__pad:focus-visible {
  box-shadow: inset 0 0 0 2px var(--cyan);
}

/* ----------------------------------------------------------- intro/result */

.session__intro,
.session__result {
  grid-area: panel;
  justify-self: start;
  width: min(100%, 640px);
  margin-top: var(--s-5);
  padding: var(--s-5) var(--s-7) var(--s-5) var(--s-6);
  background: linear-gradient(100deg, color-mix(in srgb, var(--night) 96%, transparent), color-mix(in srgb, var(--deep) 70%, transparent));
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--cyan) 30%, transparent);
  clip-path: polygon(0 0, 100% 0, calc(100% - 24px) 100%, 0 100%);
}

.session__intro[hidden],
.session__result[hidden] {
  display: none;
}

.session__lede {
  max-width: 56ch;
  margin: 0 0 var(--s-4);
  color: var(--text-2);
  font-family: var(--font-body);
  font-size: var(--fs-md);
  line-height: 1.65;
}

.session__lede kbd {
  padding: 1px 6px;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font-hud);
  font-weight: 800;
}

.session__difficulty {
  display: flex;
  gap: var(--s-2);
  margin: 0 0 var(--s-4);
  padding: 0;
  border: 0;
}

.session__difficulty legend {
  float: left;
  margin-right: var(--s-4);
  padding: 0;
  align-self: center;
  color: var(--cyan);
  font-size: var(--fs-xs);
  font-weight: 800;
  font-style: italic;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  line-height: 44px;
}

.session__difficulty label {
  position: relative;
  cursor: pointer;
}

.session__difficulty input {
  position: absolute;
  opacity: 0;
}

.session__difficulty span {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 var(--s-5);
  color: var(--text-2);
  box-shadow: inset 0 0 0 1px var(--line);
  font-size: var(--fs-sm);
  font-weight: 800;
  font-style: italic;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  clip-path: polygon(6px 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
  transition: background-color var(--dur-1) linear, color var(--dur-1) linear;
}

.session__difficulty input:checked + span {
  color: var(--ink);
  background: var(--cyan);
}

.session__difficulty label:hover span {
  color: var(--paper);
  box-shadow: inset 0 0 0 1px var(--cyan);
}

.session__difficulty input:checked + span,
.session__difficulty label:hover input:checked + span {
  color: var(--ink);
}

.session__difficulty input:focus-visible + span {
  box-shadow: inset 0 0 0 2px var(--hot);
}

.session__offset {
  display: grid;
  gap: var(--s-1);
  max-width: 360px;
  margin-bottom: var(--s-5);
  color: var(--cyan);
  font-size: var(--fs-xs);
  font-weight: 800;
  font-style: italic;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.session__offset b {
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.session__offset input {
  width: 100%;
  min-height: 32px;
  accent-color: var(--cyan);
}

.session__offset small {
  color: var(--text-3);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: none;
}

.session__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-3);
}

.session .action-link {
  border: 0;
  cursor: pointer;
}

.session__result {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "rank kicker"
    "rank title"
    "rank stats"
    "actions actions";
  column-gap: var(--s-6);
}

.session__result > .session__actions {
  grid-area: actions;
  margin-top: var(--s-5);
}

.session__result-kicker {
  grid-area: kicker;
  margin: 0;
  color: var(--cyan);
  font-size: var(--fs-xs);
  font-weight: 800;
  font-style: italic;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.session__rank {
  grid-area: rank;
  align-self: center;
  margin: 0;
  color: var(--gold);
  font-family: var(--font-display);
  font-size: var(--fs-mega);
  line-height: 0.8;
  rotate: var(--tilt-major);
  text-shadow: 6px 6px 0 var(--ink);
}

.session__result-title {
  grid-area: title;
  margin: var(--s-2) 0 var(--s-3);
  font-family: var(--font-display);
  font-size: var(--fs-2xl);
  font-weight: 400;
  line-height: 0.9;
  text-transform: uppercase;
}

.session__stats {
  grid-area: stats;
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.session__stats li {
  display: flex;
  justify-content: space-between;
  gap: var(--s-5);
  padding: var(--s-1) 0;
  border-bottom: 1px solid var(--line);
  color: var(--text-2);
  font-size: var(--fs-sm);
  font-weight: 600;
  font-style: italic;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.session__stats b {
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

/* ----------------------------------------------------------------- mobile */

@media (max-width: 920px) {
  .session__stage {
    padding: var(--s-4) var(--s-4) var(--s-5);
    overflow-y: auto;
  }

  .session__head {
    flex-wrap: wrap;
    gap: var(--s-3);
  }

  .session__title {
    display: none;
  }

  .session__highway {
    --lane-h: 52px;
  }

  /* The pads below are the keys here. */
  .session__caps {
    display: none;
  }

  .session__intro,
  .session__result {
    padding: var(--s-5);
  }

  .session__result {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "kicker" "rank" "title" "stats" "actions";
  }

  .session__rank {
    font-size: var(--fs-3xl);
  }
}

@media (prefers-reduced-motion: reduce) {
  .session__track,
  .session__combo {
    transition: none;
  }
}