* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: Arial, Helvetica, sans-serif;
  background: #10131a;
}

button {
  font: inherit;
  font-weight: bold;
  cursor: pointer;
  border: 0;
  border-radius: 12px;
  padding: 12px 18px;
  transition: transform 0.15s, filter 0.15s;
}

button:hover {
  transform: translateY(-2px);
  filter: brightness(1.08);
}

#gameShell {
  width: 100%;
  height: 100%;
  position: relative;
}

/* ---------------- MENUS ---------------- */

.menu-screen {
  display: none;
  position: absolute;
  inset: 0;
  z-index: 100;
  background:
    radial-gradient(circle at 50% 30%, #5ea8ff 0%, #24548b 45%, #101c31 100%);
  align-items: center;
  justify-content: center;
}

.menu-screen.active {
  display: flex;
}

.title-card,
.level-menu {
  width: min(700px, 92vw);
  max-height: 90vh;
  overflow: auto;
  text-align: center;
  padding: 35px;
  border-radius: 24px;
  color: white;
  background: rgba(10, 20, 35, 0.86);
  border: 2px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 30px 80px rgba(0,0,0,0.5);
}

.title-card h1 {
  font-size: clamp(38px, 7vw, 72px);
  margin: 15px 0 5px;
}

.title-card p {
  opacity: 0.8;
}

.title-card button {
  display: block;
  width: min(350px, 90%);
  margin: 10px auto;
  font-size: 18px;
}

#playButton {
  background: #ffe45c;
  color: #191919;
}

#levelSelectButton,
#loadButton {
  background: #ffffff;
}

.danger {
  background: #d83c4e;
  color: white;
}

#saveInfo {
  min-height: 20px;
}

/* ---------------- LEVEL SELECT ---------------- */

#levelButtons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(85px, 1fr));
  gap: 10px;
  margin: 25px 0;
}

.level-button {
  min-height: 65px;
  background: #edf3ff;
}

.level-button.locked {
  opacity: 0.35;
  cursor: not-allowed;
}

.level-button.current {
  outline: 4px solid #ffe45c;
}

/* ---------------- GAME ---------------- */

#gameScreen {
  display: none;
  position: absolute;
  inset: 0;
  overflow: hidden;
  background: #6db7e8;
}

#gameScreen.active {
  display: block;
}

#backgroundBack,
#backgroundMid {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

#backgroundBack {
  background:
    linear-gradient(#69bced, #bce7ff 65%, #e9f7ff);
}

#backgroundMid {
  opacity: 0.8;
}

.theme-school #backgroundMid {
  background:
    linear-gradient(transparent 60%, rgba(50, 80, 110, 0.22) 60%);
}

.theme-city #backgroundBack {
  background: linear-gradient(#3a5988, #80aee0 55%, #e7cda8);
}

.theme-city #backgroundMid {
  background:
    repeating-linear-gradient(
      90deg,
      transparent 0 70px,
      rgba(27,38,57,0.3) 70px 130px
    );
  clip-path: polygon(
    0 70%, 8% 45%, 15% 65%, 23% 35%, 32% 65%,
    42% 40%, 50% 70%, 60% 28%, 70% 60%, 80% 35%,
    90% 60%, 100% 42%, 100% 100%, 0 100%
  );
}

.theme-construction #backgroundBack {
  background: linear-gradient(#f4a35d, #ffd9a8 70%, #f2e1ca);
}

.theme-mall #backgroundBack {
  background: linear-gradient(#74cad4, #c8f4f4);
}

.theme-transport #backgroundBack {
  background: linear-gradient(#728da1, #d4e2e9);
}

.theme-harbour #backgroundBack {
  background: linear-gradient(#537d9a, #abcfe1 70%, #376d82);
}

.theme-night #backgroundBack {
  background: linear-gradient(#080f28, #1e3364 65%, #65476f);
}

.theme-storm #backgroundBack {
  background: linear-gradient(#1e2533, #495466 55%, #272c35);
}

.theme-final #backgroundBack {
  background: linear-gradient(#120f20, #422f64 60%, #d05e5e);
}

#hud {
  position: absolute;
  top: 14px;
  left: 16px;
  right: 16px;
  z-index: 50;

  display: flex;
  align-items: center;
  justify-content: space-between;

  padding: 10px 14px;

  color: white;
  background: rgba(10, 15, 25, 0.72);
  backdrop-filter: blur(8px);

  border-radius: 15px;
}

#levelTitle {
  font-size: 20px;
}

#worldTitle {
  margin-left: 10px;
  opacity: 0.7;
}

.hud-buttons {
  display: flex;
  gap: 8px;
}

.hud-buttons button {
  padding: 8px 12px;
}

#viewport {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

#world {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 100%;
  transform: translateX(0);
  will-change: transform;
}

/* ---------------- PLATFORM STYLES ---------------- */

.platform {
  position: absolute;
  border-radius: 5px 5px 0 0;
  background:
    linear-gradient(#606b75 0 12px, #303840 12px 100%);
  border-top: 3px solid #9ba5ae;

  box-shadow:
    inset 0 -8px 20px rgba(0,0,0,0.28),
    0 10px 20px rgba(0,0,0,0.25);
}

.platform.school {
  background:
    linear-gradient(#d6d6d6 0 10px, #7e8790 10px 100%);
}

.platform.construction {
  background:
    linear-gradient(#ffc13b 0 12px, #75552e 12px 100%);
}

.platform.mall {
  background:
    linear-gradient(#e7eeee 0 12px, #61818c 12px 100%);
}

.platform.train {
  background:
    linear-gradient(#dadde1 0 12px, #334a59 12px 100%);
}

.platform.harbour {
  background:
    linear-gradient(#c7a35f 0 12px, #66512b 12px 100%);
}

.platform.final {
  background:
    linear-gradient(#be5067 0 12px, #423041 12px 100%);
}

.moving-platform {
  outline: 2px solid rgba(255,255,255,0.55);
}

.checkpoint {
  position: absolute;
  width: 25px;
  height: 100px;
}

.checkpoint::before {
  content: "";
  position: absolute;
  left: 8px;
  bottom: 0;
  width: 8px;
  height: 100%;
  border-radius: 10px;
  background: white;
}

.checkpoint::after {
  content: "🦆";
  position: absolute;
  left: 10px;
  top: 0;
  font-size: 34px;
}

.finish-door {
  position: absolute;
  width: 90px;
  height: 150px;
  border-radius: 12px 12px 0 0;

  background:
    linear-gradient(90deg, #5c3723, #96633f);

  border: 7px solid #342115;

  box-shadow:
    0 0 0 5px rgba(255,255,255,0.15),
    0 15px 30px rgba(0,0,0,0.35);
}

.finish-door::before {
  content: "EXIT";
  position: absolute;
  top: -38px;
  left: 13px;

  color: white;
  font-weight: bold;

  background: #2d9c56;
  padding: 6px 10px;
  border-radius: 5px;
}

.finish-door::after {
  content: "";
  position: absolute;
  right: 10px;
  top: 70px;

  width: 10px;
  height: 10px;
  border-radius: 50%;

  background: #e8c358;
}

/* ---------------- HAZARDS ---------------- */

.hazard {
  position: absolute;
  z-index: 4;
}

.crate {
  width: 65px;
  height: 65px;

  background:
    linear-gradient(45deg, transparent 43%, #66431f 43% 57%, transparent 57%),
    linear-gradient(-45deg, transparent 43%, #66431f 43% 57%, transparent 57%),
    #a56c35;

  border: 5px solid #694622;
}

.vent {
  width: 80px;
  height: 50px;
  border-radius: 5px;

  background:
    repeating-linear-gradient(
      0deg,
      #434b51 0 5px,
      #7f8b91 5px 10px
    );

  border: 4px solid #353b40;
}

.spikes {
  width: 80px;
  height: 35px;

  background:
    linear-gradient(135deg, transparent 50%, #d9e1e5 50%) 0 0/20px 35px repeat-x;
}

.falling-object {
  position: absolute;
  width: 50px;
  height: 50px;

  background: #a86b35;
  border: 4px solid #694119;

  z-index: 20;
}

/* ---------------- PLAYER ---------------- */

#player {
  position: absolute;
  width: 50px;
  height: 105px;
  z-index: 20;

  transform-origin: bottom center;
}

#person {
  position: absolute;
  left: 7px;
  bottom: 0;
  width: 38px;
  height: 75px;
}

.person-head {
  position: absolute;
  top: 0;
  left: 8px;

  width: 24px;
  height: 24px;

  background: #efb58e;
  border-radius: 50%;
  border: 2px solid rgba(0,0,0,0.35);
}

.person-body {
  position: absolute;
  top: 22px;
  left: 3px;

  width: 34px;
  height: 39px;

  border-radius: 9px 9px 4px 4px;

  background:
    linear-gradient(90deg, #205c8f, #347eb9);
}

.person-leg {
  position: absolute;
  bottom: 0;

  width: 10px;
  height: 23px;

  background: #292d37;
  border-radius: 4px;
}

.leg-left {
  left: 6px;
}

.leg-right {
  right: 6px;
}

/* ---------------- DUCK ---------------- */

#duck {
  position: absolute;
  left: -3px;
  top: -20px;

  width: 62px;
  height: 55px;

  transform-origin: 50% 80%;

  z-index: 30;
}

.duck-body,
.big-duck .duck-body {
  position: absolute;

  width: 47px;
  height: 32px;

  left: 4px;
  bottom: 0;

  background: #ffe55e;
  border-radius: 60% 50% 55% 55%;
  border: 3px solid #cda82b;

  box-shadow: inset -7px -5px rgba(222,174,26,0.2);
}

.duck-head,
.big-duck .duck-head {
  position: absolute;

  width: 37px;
  height: 36px;

  right: 0;
  top: 0;

  background: #ffea63;

  border-radius: 50%;
  border: 3px solid #cda82b;
}

.duck-eye {
  position: absolute;

  width: 8px;
  height: 10px;

  background: #111;
  border-radius: 50%;

  top: 9px;
}

.eye-left {
  left: 9px;
}

.eye-right {
  right: 7px;
}

.duck-beak {
  position: absolute;

  right: -14px;
  top: 19px;

  width: 20px;
  height: 11px;

  background: #ec8c27;
  border-radius: 60% 80% 70% 60%;

  border: 2px solid #aa5f18;
}

.duck-wing {
  position: absolute;

  left: 11px;
  bottom: 8px;

  width: 26px;
  height: 15px;

  border-radius: 50%;

  background: #e6bd32;

  transform: rotate(-15deg);
}

.duck-brow {
  position: absolute;

  width: 12px;
  height: 3px;

  right: 4px;
  top: 5px;

  background: #8b721c;

  transform: rotate(-18deg);
  border-radius: 4px;
}

/* giant menu duck */

.big-duck {
  position: relative;

  width: 160px;
  height: 120px;

  margin: 0 auto;
  transform: scale(1.8);
  transform-origin: center bottom;
}

/* ---------------- UI ---------------- */

#windIndicator {
  position: absolute;

  left: 20px;
  bottom: 20px;

  z-index: 50;

  color: white;
  padding: 8px 12px;

  border-radius: 10px;

  background: rgba(0,0,0,0.45);
}

#checkpointMessage {
  position: absolute;

  top: 100px;
  left: 50%;

  transform: translateX(-50%) translateY(-30px);

  opacity: 0;

  color: white;
  font-size: 30px;
  font-weight: bold;

  z-index: 80;

  transition: 0.3s;
}

#checkpointMessage.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ---------------- OVERLAYS ---------------- */

.overlay {
  display: none;

  position: absolute;
  inset: 0;

  z-index: 200;

  align-items: center;
  justify-content: center;
  flex-direction: column;

  text-align: center;

  color: white;

  background: rgba(5, 8, 15, 0.92);
}

.overlay.active {
  display: flex;
}

.overlay h1 {
  font-size: clamp(36px, 6vw, 70px);
  margin-bottom: 8px;
}

.overlay button {
  width: min(320px, 80%);
  margin: 7px;
}

/* ---------------- RESPONSIVE ---------------- */

@media (max-width: 650px) {
  #hud {
    align-items: flex-start;
    gap: 8px;
  }

  #worldTitle {
    display: block;
    margin-left: 0;
  }

  .hud-buttons button {
    padding: 7px 8px;
    font-size: 12px;
  }
}