@import url("https://fonts.googleapis.com/css2?family=Nunito:wght@400;700;900&display=swap");

/* ============================================================
   ARITHMETIC RACER -- DIRECTION A: TypeRacer-style
   sky-blue + clouds + white floating cards + illustrated cars
   confident playful, polished, illustrated
   ============================================================ */

:root {
  /* sky */
  --sky-top: #5a9fd9;
  --sky-bottom: #a8cdec;

  /* cards + ink */
  --card: #ffffff;
  --card-shadow: 0 4px 16px rgba(20, 50, 90, 0.10);
  --card-shadow-lift: 0 8px 22px rgba(20, 50, 90, 0.16);

  --navy: #1e3a5f;       /* headers, primary text */
  --navy-soft: #2c4761;  /* body text */
  --navy-mute: #6b829c;  /* secondary text, hints */
  --hairline: #e1e8f1;   /* card dividers */

  /* CTAs / accents */
  --green: #5cb85c;
  --green-hover: #4ea64e;
  --green-press: #3f8d3f;

  --orange: #e88c3a;
  --orange-hover: #d97c2a;
  --orange-press: #b96820;

  --yellow: #fdd835;
  --yellow-soft: #fff3b0;

  /* car palette */
  --car-red: #e63946;     /* player */
  --car-blue: #118ab2;
  --car-yellow: #fdd835;
  --car-green: #52b788;

  /* track */
  --asphalt: #5e6c7a;
  --asphalt-deep: #4a5663;
  --lane-line: #ffffff;

  /* states */
  --danger: #d64545;
  --danger-soft: #fde2e2;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);

  --font: "Nunito", system-ui, -apple-system, "Segoe UI", sans-serif;
}

/* --- reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }

body {
  font-family: var(--font);
  font-size: 16px;
  font-weight: 400;
  color: var(--navy-soft);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;

  /* sky-blue gradient background */
  background:
    linear-gradient(180deg, var(--sky-top) 0%, var(--sky-bottom) 100%);
  background-attachment: fixed;
}

/* --- drifting cloud silhouettes --- */
/* three soft white SVG clouds, drifting slowly across the sky.
 * z-index: -1 keeps them above the body gradient but BEHIND any static
 * content inside the page (otherwise positioned-pseudo at z-index 0 paints
 * over static descendants of its stacking-context parent — see #app::before
 * below for the same fix). */
body::before,
body::after {
  content: "";
  position: fixed;
  pointer-events: none;
  z-index: -1;
  background-repeat: no-repeat;
  background-size: contain;
  opacity: 0.6;
}

/* cloud cluster 1 -- low and wide, drifts left to right */
body::before {
  top: 18%;
  left: -260px;
  width: 320px;
  height: 110px;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 320 110'><g fill='%23ffffff'><ellipse cx='80' cy='70' rx='70' ry='32'/><ellipse cx='150' cy='55' rx='70' ry='40'/><ellipse cx='225' cy='65' rx='65' ry='34'/><ellipse cx='115' cy='50' rx='42' ry='28'/><ellipse cx='190' cy='42' rx='40' ry='26'/></g></svg>");
  animation: cloud-drift-1 60s linear infinite;
}

/* cloud cluster 2 -- smaller, higher, drifts slower */
body::after {
  top: 55%;
  right: -240px;
  width: 280px;
  height: 95px;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 280 95'><g fill='%23ffffff'><ellipse cx='70' cy='60' rx='60' ry='28'/><ellipse cx='140' cy='48' rx='65' ry='34'/><ellipse cx='210' cy='58' rx='55' ry='28'/><ellipse cx='105' cy='40' rx='35' ry='22'/></g></svg>");
  opacity: 0.5;
  animation: cloud-drift-2 80s linear infinite;
}

/* third cloud lives on a fixed pseudo on #app::before below.
 * z-index: -1 (relative to #app's stacking context) puts the cloud behind
 * static descendants of #app like .profile / .lobby cards. Without this,
 * the cloud paints over the profile content and looks like a transparency
 * bug. */
#app::before {
  content: "";
  position: fixed;
  top: 72%;
  left: 8%;
  width: 220px;
  height: 75px;
  pointer-events: none;
  z-index: -1;
  opacity: 0.45;
  background-repeat: no-repeat;
  background-size: contain;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 220 75'><g fill='%23ffffff'><ellipse cx='55' cy='50' rx='50' ry='22'/><ellipse cx='115' cy='38' rx='55' ry='28'/><ellipse cx='170' cy='48' rx='45' ry='22'/></g></svg>");
  animation: cloud-drift-3 95s linear infinite;
}

@keyframes cloud-drift-1 {
  from { transform: translateX(0); }
  to   { transform: translateX(calc(100vw + 320px)); }
}
@keyframes cloud-drift-2 {
  from { transform: translateX(0); }
  to   { transform: translateX(calc(-100vw - 280px)); }
}
@keyframes cloud-drift-3 {
  from { transform: translateX(0); }
  to   { transform: translateX(calc(100vw - 220px)); }
}

/* --- beta banner --- */
.beta-banner {
  position: relative;
  z-index: 2;
  background: var(--yellow-soft);
  color: var(--navy);
  text-align: center;
  font-size: 0.92rem;
  padding: 0.5rem 1rem;
  border-bottom: 1px solid rgba(20, 50, 90, 0.08);
}
.beta-banner strong {
  font-weight: 900;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin-right: 0.35rem;
}

/* --- header --- */
.app-header {
  padding: 2.4rem 1rem 1rem;
  text-align: center;
  position: relative;
  z-index: 1;
}

.app-header h1 {
  font-family: var(--font);
  font-weight: 900;
  font-size: 3rem;
  color: var(--navy);
  line-height: 1.05;
  letter-spacing: -0.01em;
  text-shadow: 0 2px 0 rgba(255, 255, 255, 0.4);
}

.tagline {
  margin-top: 0.5rem;
  font-weight: 400;
  font-size: 1.05rem;
  color: var(--navy);
  opacity: 0.85;
}

#app {
  flex: 1;
  max-width: 880px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1rem 2rem;
  position: relative;
  z-index: 1;
}

.screen {
  display: flex;
  flex-direction: column;
  gap: 1.35rem;
  align-items: center;
}
.hidden { display: none !important; }

/* h2 -- navy, bold, no decoration */
h2 {
  font-family: var(--font);
  font-weight: 900;
  font-size: 1.85rem;
  color: var(--navy);
  letter-spacing: -0.01em;
}

/* ============================================================
   BUTTONS -- skeuomorphic press feel, confident colors
   ============================================================ */
button {
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 700;
  padding: 0.7rem 1.4rem;
  border: none;
  background: #ffffff;
  color: var(--navy);
  cursor: pointer;
  border-radius: 6px;
  box-shadow:
    0 2px 0 rgba(20, 50, 90, 0.18),
    0 3px 8px rgba(20, 50, 90, 0.12);
  transition:
    transform 140ms var(--ease),
    box-shadow 140ms var(--ease),
    background 140ms var(--ease),
    color 140ms var(--ease);
}

button:hover {
  transform: translateY(-2px);
  box-shadow:
    0 4px 0 rgba(20, 50, 90, 0.2),
    0 6px 14px rgba(20, 50, 90, 0.18);
}

button:focus-visible {
  outline: 3px solid var(--yellow);
  outline-offset: 2px;
}

button:active {
  transform: translateY(0);
  box-shadow:
    0 1px 0 rgba(20, 50, 90, 0.18),
    0 2px 4px rgba(20, 50, 90, 0.10);
}

/* secondary action buttons (Create Room, Play again) -- warm orange */
#create-room-btn,
#play-again-btn {
  background: var(--orange);
  color: #ffffff;
}
#create-room-btn:hover,
#play-again-btn:hover {
  background: var(--orange-hover);
}
#create-room-btn:active,
#play-again-btn:active {
  background: var(--orange-press);
}

/* primary CTA (Quickplay) -- confident green */
button.primary {
  background: var(--green);
  color: #ffffff;
}
button.primary:hover {
  background: var(--green-hover);
}
button.primary:active {
  background: var(--green-press);
}

/* selected difficulty -- golden yellow */
button[aria-pressed="true"] {
  background: var(--yellow);
  color: var(--navy);
  box-shadow:
    0 2px 0 rgba(20, 50, 90, 0.25),
    inset 0 0 0 2px rgba(20, 50, 90, 0.12);
}
button[aria-pressed="true"]:hover {
  background: #ffe066;
}

/* ============================================================
   LOBBY CARDS -- white tiles floating above the sky
   ============================================================ */
#lobby h2 {
  margin-bottom: 0.25rem;
}

.difficulty-picker {
  display: flex;
  gap: 0.6rem;
  padding: 1.1rem 1.25rem;
  background: var(--card);
  border-radius: 12px;
  box-shadow: var(--card-shadow);
  position: relative;
}
.difficulty-picker::before {
  content: "Difficulty";
  position: absolute;
  top: -0.6rem;
  left: 1.1rem;
  font-weight: 900;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--card);
  padding: 0 0.45rem;
  color: var(--navy-mute);
}

.lobby-actions {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
  justify-content: center;
  padding: 1.1rem 1.25rem;
  background: var(--card);
  border-radius: 12px;
  box-shadow: var(--card-shadow);
}

/* ============================================================
   COUNTDOWN -- big, navy, confident, gentle pop
   ============================================================ */
#countdown {
  position: fixed;
  top: 38%;
  left: 50%;
  z-index: 10;
  font-family: var(--font);
  font-weight: 900;
  font-size: 6rem;
  color: var(--navy);
  font-variant-numeric: tabular-nums;
  line-height: 1;
  text-align: center;
  background: var(--card);
  padding: 1.4rem 2.8rem;
  min-width: 9rem;
  border-radius: 1rem;
  box-shadow: var(--card-shadow-lift);
  pointer-events: none;
  animation: countdown-pop 800ms var(--ease) infinite alternate;
}
@keyframes countdown-pop {
  from { transform: translate(-50%, -50%) scale(0.96); }
  to   { transform: translate(-50%, -50%) scale(1.04); }
}

/* ============================================================
   FINISH BANNER -- centered overlay during the post-finish grace window
   ============================================================ */
#finish-banner {
  position: fixed;
  top: 38%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 10;
  background: var(--card);
  padding: 1.6rem 2.6rem;
  border-radius: 1rem;
  box-shadow: var(--card-shadow-lift);
  text-align: center;
  pointer-events: none;
  animation: finish-pop 0.55s var(--ease) backwards;
}
.finish-banner-place {
  font-family: var(--font);
  font-weight: 900;
  font-size: 2.4rem;
  color: var(--navy);
  line-height: 1.1;
  letter-spacing: -0.01em;
}
.finish-banner-time {
  margin-top: 0.35rem;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--navy-mute);
  font-variant-numeric: tabular-nums;
}
#finish-banner.first-place {
  background: linear-gradient(180deg, var(--yellow-soft) 0%, #fff 100%);
  border: 2px solid var(--yellow);
  padding: 1.8rem 3rem;
  animation: finish-pop-first 0.7s var(--ease) backwards;
}
#finish-banner.first-place .finish-banner-place {
  font-size: 2.8rem;
  color: #b8860b;
  text-shadow: 0 2px 0 rgba(255, 255, 255, 0.6);
}
@keyframes finish-pop {
  0%   { transform: translate(-50%, -50%) scale(0.7); opacity: 0; }
  70%  { transform: translate(-50%, -50%) scale(1.06); opacity: 1; }
  100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
}
@keyframes finish-pop-first {
  0%   { transform: translate(-50%, -50%) scale(0.6) rotate(-3deg); opacity: 0; }
  60%  { transform: translate(-50%, -50%) scale(1.12) rotate(2deg); opacity: 1; }
  80%  { transform: translate(-50%, -50%) scale(0.98) rotate(-1deg); }
  100% { transform: translate(-50%, -50%) scale(1) rotate(0); opacity: 1; }
}

/* victory bounce on the player car when they cross 1st */
.car.you.victory {
  animation: car-victory 0.6s var(--ease) 2 forwards;
}
@keyframes car-victory {
  0%   { transform: translateY(-50%) rotate(0); }
  30%  { transform: translateY(calc(-50% - 14px)) rotate(-4deg); }
  60%  { transform: translateY(-50%) rotate(3deg); }
  100% { transform: translateY(-50%) rotate(0); }
}

/* ============================================================
   PROBLEM QUEUE -- white card, navy headline numbers
   ============================================================ */
#problem-viewport {
  width: 100%;
  max-width: 720px;
  height: 11.2rem;
  overflow: hidden;
  position: relative;
  margin-bottom: 0.25rem;
  background: var(--card);
  border-radius: 12px;
  box-shadow: var(--card-shadow);

  /* soft top/bottom fade to focus eye on center */
  background-image:
    linear-gradient(to bottom, #ffffff 0%, rgba(255,255,255,0) 16%, rgba(255,255,255,0) 84%, #ffffff 100%);
}

#problem-queue {
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: transform 260ms var(--ease);
  will-change: transform;
}

.queue-item {
  width: 100%;
  height: 2.8rem;
  line-height: 2.8rem;
  font-family: var(--font);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  text-align: center;
  font-size: 1.5rem;
  color: var(--navy-mute);
  opacity: 0;
  /* Only opacity + transform are GPU-cheap; font-size/weight changes
     trigger layout on every animation frame and starve the car paint loop. */
  transition: opacity 240ms var(--ease);
}
.queue-item.current {
  font-size: 3rem;
  font-weight: 900;
  color: var(--navy);
  opacity: 1;
}
.queue-item.upcoming-1 { opacity: 0.6; }
.queue-item.upcoming-2 { opacity: 0.35; }
.queue-item.upcoming-3 { opacity: 0.18; }

/* ============================================================
   ANSWER INPUT -- white card with green focus glow
   ============================================================ */
#answer-input {
  font-family: var(--font);
  font-weight: 900;
  font-size: 2rem;
  padding: 0.55rem 1rem;
  width: 16rem;
  text-align: center;
  border: 2px solid var(--hairline);
  background: #ffffff;
  color: var(--navy);
  border-radius: 8px;
  font-variant-numeric: tabular-nums;
  caret-color: var(--green);
  box-shadow: 0 2px 0 rgba(20, 50, 90, 0.08);
  transition:
    box-shadow 160ms var(--ease),
    border-color 160ms var(--ease),
    background 160ms var(--ease),
    transform 160ms var(--ease);
}
#answer-input::placeholder {
  color: var(--navy-mute);
  opacity: 0.55;
  font-weight: 700;
}
#answer-input:focus {
  outline: none;
  border-color: var(--green);
  background: #ffffff;
  box-shadow:
    0 0 0 4px rgba(92, 184, 92, 0.22),
    0 2px 0 rgba(20, 50, 90, 0.08);
  transform: translateY(-1px);
}
#answer-input.wrong {
  border-color: var(--danger);
  background: var(--danger-soft);
  color: var(--danger);
  animation: shake 260ms;
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%      { transform: translateX(-6px); }
  40%      { transform: translateX(6px); }
  60%      { transform: translateX(-4px); }
  80%      { transform: translateX(4px); }
}

/* hide number-input spinners */
#answer-input::-webkit-outer-spin-button,
#answer-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
#answer-input[type="number"] { -moz-appearance: textfield; }

/* ============================================================
   TRACK -- asphalt road with dashed center lines per lane
   ============================================================ */
.track {
  width: 100%;
  max-width: 720px;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin-top: 1rem;
  padding: 1.1rem 1rem;
  background: var(--card);
  border-radius: 12px;
  box-shadow: var(--card-shadow);
  position: relative;
}
.track::before {
  content: "Track";
  position: absolute;
  top: -0.6rem;
  left: 1.1rem;
  font-weight: 900;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--card);
  padding: 0 0.45rem;
  color: var(--navy-mute);
}

.lane {
  position: relative;
  height: 48px;
  background-color: var(--asphalt);
  border-radius: 8px;
  padding-left: 8rem;
  padding-right: 1.8rem;
  contain: layout paint;

  /* dashed white center line down the middle of each lane */
  background-image:
    linear-gradient(to right, transparent 8rem, var(--lane-line) 8rem, var(--lane-line) calc(8rem + 16px), transparent calc(8rem + 16px), transparent calc(8rem + 32px), var(--lane-line) calc(8rem + 32px), var(--lane-line) calc(8rem + 48px), transparent calc(8rem + 48px));
  background-size: 64px 3px;
  background-position: 0 50%;
  background-repeat: repeat-x;

  box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.18);
}

.lane-handle {
  position: absolute;
  top: 50%;
  left: 0.6rem;
  transform: translateY(-50%);
  font-family: var(--font);
  font-weight: 700;
  font-size: 0.95rem;
  color: #ffffff;
  z-index: 1;
  white-space: nowrap;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
  background: rgba(20, 50, 90, 0.55);
  padding: 0.18rem 0.45rem;
  border-radius: 4px;
}

/* ============================================================
   CARS -- illustrated 2D side-view racers, drawn entirely in CSS
   rounded body, two visible wheels with darker rims, windshield strip,
   small spoiler. No faces.
   ============================================================ */
.car {
  position: absolute;
  top: 50%;
  left: calc(8rem + var(--progress, 0) * (100% - 8rem - 1.8rem - 48px));
  transform: translateY(-50%);
  height: 28px;
  width: 48px;
  background: var(--car-blue);
  border-radius: 14px 22px 6px 6px / 14px 22px 6px 6px;
  transition: left 220ms var(--ease);
  z-index: 2;
  will-change: left;
  box-shadow:
    inset 0 -4px 0 rgba(0, 0, 0, 0.18),
    inset 0 2px 0 rgba(255, 255, 255, 0.25),
    0 2px 4px rgba(0, 0, 0, 0.25);
}

/* windshield strip -- lighter slanted band on top-front of body */
.car::before {
  content: "";
  position: absolute;
  top: 4px;
  right: 8px;
  width: 18px;
  height: 9px;
  background: rgba(255, 255, 255, 0.55);
  border-radius: 4px 8px 2px 2px;
  transform: skewX(-18deg);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

/* wheels -- two black circles with darker rim, plus a tiny spoiler at the back */
.car::after {
  content: "";
  position: absolute;
  /* draw both wheels using the box's box-shadow trick */
  bottom: -5px;
  left: 6px;
  width: 11px;
  height: 11px;
  background: #1a1a1a;
  border: 2px solid #3a3a3a;
  border-radius: 50%;
  box-shadow:
    /* second wheel */
    25px 0 0 -2px #3a3a3a,
    25px 0 0 -4px #1a1a1a,
    /* spoiler -- small dark wedge behind the body */
    -8px -7px 0 -3px rgba(0, 0, 0, 0.55);
}

/* opponent palette cycling per lane */
.lane:nth-of-type(1) .car:not(.you) { background: var(--car-blue); }
.lane:nth-of-type(2) .car:not(.you) { background: var(--car-yellow); }
.lane:nth-of-type(3) .car:not(.you) { background: var(--car-green); }
.lane:nth-of-type(4) .car:not(.you) { background: var(--car-blue); }
.lane:nth-of-type(5) .car:not(.you) { background: var(--car-yellow); }
.lane:nth-of-type(6) .car:not(.you) { background: var(--car-green); }

/* yellow opponent gets a darker windshield for contrast */
.lane:nth-of-type(2) .car:not(.you)::before,
.lane:nth-of-type(5) .car:not(.you)::before {
  background: rgba(20, 50, 90, 0.4);
}

/* PLAYER CAR -- vivid red, slightly larger */
.car.you {
  background: var(--car-red);
  height: 32px;
  width: 54px;
  z-index: 3;
  box-shadow:
    inset 0 -5px 0 rgba(0, 0, 0, 0.22),
    inset 0 2px 0 rgba(255, 255, 255, 0.3),
    0 3px 6px rgba(0, 0, 0, 0.3);
}
.car.you::before {
  width: 22px;
  height: 11px;
  top: 5px;
  right: 9px;
}
.car.you::after {
  bottom: -6px;
  left: 7px;
  width: 13px;
  height: 13px;
  box-shadow:
    28px 0 0 -2px #3a3a3a,
    28px 0 0 -4px #1a1a1a,
    -9px -8px 0 -3px rgba(0, 0, 0, 0.6);
}

/* ============================================================
   FINISH FLAG -- checkered pole at the right of each lane
   ============================================================ */
.lane-finish {
  position: absolute;
  right: 0.4rem;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 34px;
  border-radius: 2px;
  background-image:
    linear-gradient(45deg, #1a1a1a 25%, transparent 25%, transparent 75%, #1a1a1a 75%),
    linear-gradient(45deg, #1a1a1a 25%, transparent 25%, transparent 75%, #1a1a1a 75%);
  background-size: 8px 8px;
  background-position: 0 0, 4px 4px;
  background-color: #ffffff;
  box-shadow: -2px 0 0 0 #1a1a1a;
  z-index: 1;
}

/* dropped lane -- desaturated, muted */
.lane.dropped { opacity: 0.5; filter: saturate(0.4); }
.lane.dropped .lane-handle::after {
  content: " (left)";
  margin-left: 0.2rem;
  opacity: 0.85;
}
.lane.dropped .car { background: #9aa5b1; }

/* ============================================================
   HUD -- score chip + quit link
   ============================================================ */
#hud {
  display: flex;
  gap: 1.2rem;
  align-items: center;
  font-family: var(--font);
  font-weight: 700;
  color: var(--navy);
  font-size: 1rem;
  margin-top: 0.6rem;
}
#score {
  color: var(--navy);
  font-family: var(--font);
  font-weight: 900;
  font-size: 1.4rem;
  font-variant-numeric: tabular-nums;
  background: #ffffff;
  border-radius: 8px;
  padding: 0.25rem 0.85rem;
  box-shadow: var(--card-shadow);
  display: inline-block;
}
#score::before {
  content: "Score ";
  color: var(--navy-mute);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-right: 0.3rem;
}

.link-button {
  background: none;
  border: none;
  padding: 0;
  color: var(--navy);
  font-family: var(--font);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 2px;
  text-decoration-color: var(--orange);
  border-radius: 0;
  box-shadow: none;
}
.link-button:hover {
  background: none;
  box-shadow: none;
  color: var(--orange-hover);
  text-decoration-color: var(--orange-hover);
  transform: none;
}
.link-button:active {
  transform: none;
  box-shadow: none;
}

/* ============================================================
   RESULTS / PODIUM
   1st = golden yellow card, 2nd = silver-blue, 3rd = bronze-orange
   ============================================================ */
#podium {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-top: 0.5rem;
  width: 100%;
  max-width: 560px;
  counter-reset: rank;
}
#podium li {
  padding: 0.85rem 1.1rem 0.85rem 3.2rem;
  background: var(--card);
  border-radius: 10px;
  font-family: var(--font);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--navy);
  position: relative;
  box-shadow: var(--card-shadow);
  counter-increment: rank;
}
#podium li::before {
  content: counter(rank);
  position: absolute;
  left: 0.7rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font);
  font-weight: 900;
  font-size: 1.5rem;
  color: var(--navy-mute);
  width: 1.8rem;
  text-align: center;
}
#podium li:nth-child(1) {
  background: linear-gradient(180deg, var(--yellow) 0%, #f5c518 100%);
  color: var(--navy);
  box-shadow:
    var(--card-shadow-lift),
    inset 0 -3px 0 rgba(20, 50, 90, 0.12);
}
#podium li:nth-child(1)::before {
  content: "1";
  color: var(--navy);
}
#podium li:nth-child(1)::after {
  content: "★";
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  color: var(--navy);
}
#podium li:nth-child(2) {
  background: linear-gradient(180deg, #e7eef6 0%, #cfdaea 100%);
}
#podium li:nth-child(3) {
  background: linear-gradient(180deg, #fde2c5 0%, #f3c89a 100%);
}
#podium li.unfinished {
  color: var(--navy-mute);
  background: #f3f6fa;
  font-weight: 400;
}

/* ============================================================
   LOBBY-ROOM (private rooms) -- shares the lobby card aesthetic
   ============================================================ */
#lobby-room h2 {
  margin-bottom: 0.1rem;
  font-family: var(--font);
  letter-spacing: -0.005em;
  text-align: center;
}
#room-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--navy);
  background: var(--card);
  padding: 0.6rem 1.1rem;
  border-radius: 10px;
  box-shadow: var(--card-shadow);
  font-variant-numeric: tabular-nums;
}

.room-config {
  display: flex;
  gap: 0.85rem;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

.race-length-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1.05rem 1.1rem;
  background: var(--card);
  border-radius: 12px;
  box-shadow: var(--card-shadow);
  font-weight: 700;
  color: var(--navy);
  font-size: 0.95rem;
}
#race-length-input {
  width: 4rem;
  padding: 0.35rem 0.5rem;
  font-family: var(--font);
  font-weight: 700;
  font-size: 1rem;
  border: 2px solid var(--hairline);
  border-radius: 6px;
  text-align: center;
  color: var(--navy);
  background: #fff;
  font-variant-numeric: tabular-nums;
}
#race-length-input:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.players-heading {
  font-family: var(--font);
  font-weight: 900;
  font-size: 1rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--navy-mute);
  margin-top: 0.4rem;
  margin-bottom: 0.1rem;
}

#room-players {
  list-style: none;
  width: 100%;
  max-width: 520px;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}
.player-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.7rem 1rem;
  background: var(--card);
  border-radius: 10px;
  box-shadow: var(--card-shadow);
}
.player-handle {
  font-weight: 700;
  color: var(--navy);
  font-size: 1.05rem;
}
.player-handle.editable {
  cursor: pointer;
  border-bottom: 2px dashed transparent;
  transition: border-color 140ms var(--ease);
}
.player-handle.editable:hover {
  border-bottom-color: var(--orange);
}
.handle-edit {
  font-family: var(--font);
  font-weight: 700;
  font-size: 1rem;
  padding: 0.2rem 0.5rem;
  border: 2px solid var(--green);
  border-radius: 6px;
  background: #fff;
  color: var(--navy);
  width: 11rem;
}
.handle-edit:focus { outline: none; box-shadow: 0 0 0 3px rgba(92,184,92,0.22); }

.badge {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
}
.badge-you { background: var(--yellow-soft); color: var(--navy); }
.badge-host { background: var(--orange); color: #fff; }
.badge-guest { background: var(--hairline); color: var(--navy-mute); }
.player-status {
  margin-left: auto;
  color: var(--navy-mute);
  font-size: 0.92rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.room-actions {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  padding: 1rem 1.2rem;
  background: var(--card);
  border-radius: 12px;
  box-shadow: var(--card-shadow);
}
button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

.lobby-hint {
  color: var(--navy);
  opacity: 0.85;
  font-weight: 700;
  font-size: 0.95rem;
  text-align: center;
  min-height: 1.2em;
}

/* invite modal */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(20, 50, 90, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 20;
  padding: 1rem;
}
.modal.hidden { display: none !important; }
.modal-card {
  background: var(--card);
  padding: 1.6rem 1.8rem;
  border-radius: 14px;
  box-shadow: var(--card-shadow-lift);
  max-width: 28rem;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}
.modal-card h3 {
  font-family: var(--font);
  font-weight: 900;
  font-size: 1.25rem;
  color: var(--navy);
}
.modal-card p { color: var(--navy-soft); font-size: 0.95rem; }
#invite-url {
  font-family: var(--font);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.6rem 0.8rem;
  border: 2px solid var(--hairline);
  border-radius: 8px;
  background: #f7f9fc;
  color: var(--navy);
  width: 100%;
}
#invite-url:focus { outline: none; border-color: var(--green); }
.modal-actions {
  display: flex;
  gap: 0.7rem;
  justify-content: flex-end;
}
#invite-copy-btn { background: var(--green); color: #fff; }
#invite-copy-btn:hover { background: var(--green-hover); }

/* error toast */
.error-toast {
  position: fixed;
  top: 1.2rem;
  left: 50%;
  transform: translateX(-50%) translateY(-120%);
  background: var(--danger);
  color: #fff;
  font-weight: 700;
  padding: 0.7rem 1.2rem;
  border-radius: 8px;
  box-shadow: var(--card-shadow-lift);
  z-index: 30;
  transition: transform 220ms var(--ease);
  max-width: 90vw;
  text-align: center;
}
.error-toast.visible { transform: translateX(-50%) translateY(0); }

/* ============================================================
   FOOTER
   ============================================================ */
.app-footer {
  padding: 1.25rem 1rem;
  text-align: center;
  color: var(--navy);
  font-family: var(--font);
  font-weight: 400;
  font-size: 0.95rem;
  position: relative;
  z-index: 1;
  opacity: 0.85;
}
.app-footer a {
  color: var(--navy);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}
.app-footer a:hover {
  color: var(--orange-hover);
  text-decoration-color: var(--orange-hover);
}

/* selection */
::selection {
  background: var(--yellow);
  color: var(--navy);
}

/* ============================================================
   REDUCED MOTION -- kill clouds and decorative bobs
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  body::before,
  body::after,
  #app::before { animation: none; }
  #countdown { animation: none; }
  .car.you { animation: none; }
  button:hover { transform: none; }
  .queue-item.current { transform: none; }
  #problem-queue { transition: none; }
  .car { transition: left 180ms ease-out; }
}

/* ============================================================
   SMALL SCREENS
   ============================================================ */
@media (max-width: 540px) {
  .app-header h1 { font-size: 2.1rem; }
  h2 { font-size: 1.5rem; }
  #countdown { font-size: 4.4rem; height: 4.8rem; line-height: 4.8rem; }
  #answer-input { width: 12rem; font-size: 1.7rem; }
  .queue-item.current { font-size: 2.4rem; }
  .lane { padding-left: 6.5rem; }
  .car { left: calc(6.5rem + var(--progress, 0) * (100% - 6.5rem - 1.8rem - 48px)); }
  .lane-handle { font-size: 0.85rem; }
  .difficulty-picker,
  .lobby-actions { padding: 1rem; }
  /* simplify lane dashed line spacing on narrow screens */
  .lane {
    background-image:
      linear-gradient(to right, transparent 6.5rem, var(--lane-line) 6.5rem, var(--lane-line) calc(6.5rem + 12px), transparent calc(6.5rem + 12px), transparent calc(6.5rem + 24px), var(--lane-line) calc(6.5rem + 24px), var(--lane-line) calc(6.5rem + 36px), transparent calc(6.5rem + 36px));
    background-size: 48px 3px;
  }
}