:root {
  --ink: #17324d;
  --muted: #6b8194;
  --sky: #dff5f5;
  --mint: #bfe8d2;
  --track: #f3c987;
  --track-line: #fff4d6;
  --orange: #f07842;
  --blue: #3678c8;
  --yellow: #ffd36b;
  --runner-duration: 0.52s;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background: var(--sky);
  color: var(--ink);
  font-family: "Nunito", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 28px 20px;
  background:
    radial-gradient(
      circle at 18% 18%,
      rgba(255, 255, 255, 0.9) 0 7%,
      transparent 7.3%
    ),
    radial-gradient(
      circle at 82% 12%,
      rgba(255, 255, 255, 0.72) 0 5%,
      transparent 5.3%
    ),
    linear-gradient(180deg, #dff5f5 0 57%, #bfe8d2 57% 100%);
}

.app {
  width: min(940px, 100%);
  overflow: hidden;
  border: 3px solid var(--ink);
  border-radius: 28px;
  background: #fffdf5;
  box-shadow: 10px 12px 0 rgba(23, 50, 77, 0.16);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 28px 18px;
  border-bottom: 3px solid var(--ink);
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--orange);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(26px, 5vw, 42px);
  line-height: 1;
}

.pace-badge {
  min-width: 116px;
  padding: 10px 14px;
  border: 2px solid var(--ink);
  border-radius: 14px;
  background: var(--yellow);
  text-align: center;
  font-size: 13px;
  font-weight: 800;
}

.pace-badge strong {
  display: block;
  font-size: 25px;
  line-height: 1;
}

.scene {
  position: relative;
  height: 470px;
  overflow: hidden;
  background: linear-gradient(
    180deg,
    #bceeee 0%,
    #eaf9e9 68%,
    #d5efcf 100%
  );
}

.cloud {
  position: absolute;
  width: 92px;
  height: 24px;
  border-radius: 30px;
  background: rgba(255, 255, 255, 0.82);
}
.cloud::before,
.cloud::after {
  position: absolute;
  content: "";
  border-radius: 50%;
  background: inherit;
}
.cloud::before {
  width: 38px;
  height: 38px;
  left: 18px;
  bottom: 7px;
}
.cloud::after {
  width: 30px;
  height: 30px;
  right: 15px;
  bottom: 5px;
}
.cloud.one {
  top: 62px;
  left: 9%;
}
.cloud.two {
  top: 116px;
  right: 8%;
  transform: scale(0.72);
}

.tree-line {
  position: absolute;
  right: 0;
  bottom: 126px;
  left: 0;
  height: 112px;
  background: repeating-linear-gradient(
    110deg,
    transparent 0 45px,
    #73be88 45px 52px,
    transparent 52px 96px
  );
  opacity: 0.48;
}

.track {
  position: absolute;
  right: -5%;
  bottom: -18px;
  left: -5%;
  height: 170px;
  transform: perspective(300px) rotateX(10deg);
  background: var(--track);
  border-top: 5px solid var(--ink);
}

.track::before,
.track::after {
  position: absolute;
  content: "";
  right: -10%;
  left: -10%;
  height: 7px;
  background: repeating-linear-gradient(
    90deg,
    var(--track-line) 0 42px,
    transparent 42px 82px
  );
  animation: road var(--runner-duration) linear infinite;
}
.track::before {
  top: 45px;
}
.track::after {
  top: 104px;
  animation-direction: reverse;
}

.runner {
  position: absolute;
  z-index: 2;
  bottom: 96px;
  left: 50%;
  width: 136px;
  height: 270px;
  transform: translateX(-50%);
}

.runner-shadow {
  position: absolute;
  right: 5px;
  bottom: -3px;
  left: 7px;
  height: 18px;
  border-radius: 50%;
  background: rgba(23, 50, 77, 0.2);
  animation: shadow var(--runner-duration) ease-in-out infinite;
}

.head {
  position: absolute;
  z-index: 4;
  top: 4px;
  left: 39px;
  width: 76px;
  height: 78px;
  border: 3px solid var(--ink);
  border-radius: 46% 48% 45% 48%;
  background: #f4b27d;
  transform-origin: 50% 100%;
  animation: bob var(--runner-duration) ease-in-out infinite;
}

.hair {
  position: absolute;
  top: -12px;
  left: -2px;
  width: 73px;
  height: 34px;
  border: 3px solid var(--ink);
  border-bottom: 0;
  border-radius: 48% 55% 20% 20%;
  background: #273c53;
  transform: rotate(-5deg);
}
.hair::after {
  position: absolute;
  top: 17px;
  left: 3px;
  width: 20px;
  height: 18px;
  border-radius: 50%;
  background: #273c53;
  content: "";
}
.eye {
  position: absolute;
  top: 36px;
  width: 7px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
}
.eye.left {
  left: 20px;
}
.eye.right {
  right: 18px;
}
.smile {
  position: absolute;
  right: 17px;
  bottom: 16px;
  width: 19px;
  height: 9px;
  border-bottom: 3px solid var(--ink);
  border-radius: 50%;
}

.neck {
  position: absolute;
  z-index: 3;
  top: 72px;
  left: 60px;
  width: 29px;
  height: 26px;
  border: 3px solid var(--ink);
  border-top: 0;
  background: #efa876;
}
.shirt {
  position: absolute;
  z-index: 2;
  top: 82px;
  left: 28px;
  width: 92px;
  height: 108px;
  border: 3px solid var(--ink);
  border-radius: 28px 28px 20px 20px;
  background: var(--blue);
  transform: rotate(3deg);
}
.shirt::after {
  position: absolute;
  top: 13px;
  left: 39px;
  width: 16px;
  height: 70px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.18);
  content: "";
}
.shorts {
  position: absolute;
  z-index: 3;
  top: 174px;
  left: 29px;
  width: 88px;
  height: 48px;
  border: 3px solid var(--ink);
  border-radius: 8px 8px 18px 18px;
  background: #263f68;
}

.arm,
.leg {
  position: absolute;
  z-index: 1;
  transform-origin: 50% 12px;
}
.arm {
  top: 94px;
  left: 22px;
  width: 22px;
  height: 108px;
  border: 3px solid var(--ink);
  border-radius: 15px;
  background: #f1ad79;
}
.arm.back {
  z-index: 0;
  left: 93px;
  height: 100px;
  animation: arm-back var(--runner-duration) ease-in-out infinite;
}
.arm.front {
  animation: arm-front var(--runner-duration) ease-in-out infinite;
}
.hand {
  position: absolute;
  bottom: -14px;
  left: -3px;
  width: 24px;
  height: 25px;
  border: 3px solid var(--ink);
  border-radius: 50%;
  background: #f1ad79;
}
.leg {
  top: 208px;
  left: 44px;
  width: 25px;
  height: 94px;
  border: 3px solid var(--ink);
  border-radius: 16px;
  background: #f1ad79;
}
.leg.back {
  left: 75px;
  animation: leg-back var(--runner-duration) ease-in-out infinite;
}
.leg.front {
  animation: leg-front var(--runner-duration) ease-in-out infinite;
}
.shoe {
  position: absolute;
  bottom: -12px;
  left: -14px;
  width: 58px;
  height: 24px;
  border: 3px solid var(--ink);
  border-radius: 22px 24px 12px 8px;
  background: #f5f0e5;
}
.shoe::after {
  position: absolute;
  right: -4px;
  bottom: -4px;
  width: 52px;
  height: 6px;
  border-radius: 5px;
  background: var(--orange);
  content: "";
}

.controls {
  padding: 22px 28px 26px;
  background: #fffdf5;
}
.action-row {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}
.action-row button {
  flex: 1;
  padding: 12px 16px;
  border: 3px solid var(--ink);
  border-radius: 12px;
  background: var(--blue);
  color: #fff;
  font: inherit;
  font-weight: 900;
  cursor: pointer;
  box-shadow: 3px 3px 0 var(--ink);
}
.action-row button:hover:not(:disabled) {
  transform: translateY(-1px);
}
.action-row button:active:not(:disabled) {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 var(--ink);
}
.action-row button.secondary {
  background: var(--orange);
}
.action-row button:disabled {
  cursor: not-allowed;
  opacity: 0.42;
}
.timer {
  margin: 16px 0 0;
  color: var(--muted);
  text-align: center;
  font-size: 13px;
}
.timer strong {
  color: var(--ink);
  font-size: 18px;
  font-variant-numeric: tabular-nums;
}
.report {
  display: none;
  margin-top: 20px;
  padding: 18px;
  border: 3px solid var(--ink);
  border-radius: 16px;
  background: #162f49;
  color: #eafffa;
  box-shadow: 5px 5px 0 var(--orange);
}
.report.visible {
  display: block;
  animation: report-in 0.35s ease-out both;
}
.report h2 {
  margin: 0 0 12px;
  color: var(--yellow);
  font-size: 18px;
  letter-spacing: 0.08em;
}
.report-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.report-item {
  padding: 10px;
  border: 1px solid rgba(234, 255, 250, 0.3);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.07);
}
.report-item span {
  display: block;
  color: #9dc3c5;
  font-size: 12px;
}
.report-item strong {
  display: block;
  margin-top: 3px;
  color: #fff;
  font-size: 21px;
}
.report-note {
  margin: 14px 0 0;
  color: #b8dbd4;
  font-size: 13px;
}
.is-paused .runner *,
.is-paused .track::before,
.is-paused .track::after {
  animation-play-state: paused;
}
@keyframes report-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.control-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 10px;
}
.control-head h2 {
  margin: 0;
  font-size: 18px;
}
.control-head span {
  color: var(--muted);
  font-size: 13px;
}
.speed-value {
  color: var(--orange) !important;
  font-size: 20px !important;
  font-weight: 900;
}
input[type="range"] {
  width: 100%;
  height: 12px;
  margin: 0;
  appearance: none;
  border-radius: 10px;
  outline: none;
  background: linear-gradient(90deg, var(--blue) 0 42%, #dbe6e7 42% 100%);
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  width: 28px;
  height: 28px;
  appearance: none;
  border: 3px solid var(--ink);
  border-radius: 50%;
  background: var(--yellow);
  box-shadow: 2px 2px 0 var(--ink);
}
input[type="range"]::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border: 3px solid var(--ink);
  border-radius: 50%;
  background: var(--yellow);
  box-shadow: 2px 2px 0 var(--ink);
}
.range-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  color: var(--muted);
  font-size: 12px;
}

@keyframes road {
  to {
    transform: translateX(-82px);
  }
}
@keyframes shadow {
  50% {
    transform: scaleX(0.78);
    opacity: 0.55;
  }
}
@keyframes bob {
  50% {
    transform: translateY(-7px) rotate(3deg);
  }
}
@keyframes arm-front {
  0%,
  100% {
    transform: rotate(38deg);
  }
  50% {
    transform: rotate(-42deg);
  }
}
@keyframes arm-back {
  0%,
  100% {
    transform: rotate(-42deg);
  }
  50% {
    transform: rotate(38deg);
  }
}
@keyframes leg-front {
  0%,
  100% {
    transform: rotate(35deg);
  }
  50% {
    transform: rotate(-43deg);
  }
}
@keyframes leg-back {
  0%,
  100% {
    transform: rotate(-43deg);
  }
  50% {
    transform: rotate(35deg);
  }
}

@media (max-width: 560px) {
  .page {
    padding: 0;
  }
  .app {
    min-height: 100vh;
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }
  .topbar,
  .controls {
    padding-right: 20px;
    padding-left: 20px;
  }
  .scene {
    height: 430px;
  }
  .runner {
    transform: translateX(-50%) scale(0.88);
    transform-origin: bottom center;
  }
  .report-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .report-item strong {
    font-size: 17px;
  }
}