/* styles.css */
* {
  box-sizing: border-box;
}

body {
  background-color: #111;
  color: #fff;
  font-family: Arial, sans-serif;
  margin: 0;
  overflow-x: hidden;
}

/* HEADER */
#top-header {
  background-color: #1a1a1a;
  border-bottom: 1px solid #333;
  padding: 12px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 100%;
  padding: 0 15px;
}

.header-title {
  margin: 0;
  font-size: 24px;
  font-weight: bold;
  color: #fff;
}

.hamburger-btn {
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.hamburger-btn span {
  width: 25px;
  height: 3px;
  background-color: #fff;
  border-radius: 2px;
  transition: all 0.3s ease;
}

.hamburger-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(10px, 10px);
}

.hamburger-btn.active span:nth-child(2) {
  opacity: 0;
}

.hamburger-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* SIDE MENU */
#menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: none;
  z-index: 90;
}

#menu-overlay.active {
  display: block;
}

.side-menu {
  position: fixed;
  right: 0;
  top: 0;
  width: 280px;
  height: 100vh;
  background-color: #1a1a1a;
  border-left: 1px solid #333;
  transform: translateX(100%);
  transition: transform 0.3s ease;
  z-index: 95;
  overflow-y: auto;
}

.side-menu.active {
  transform: translateX(0);
}

.menu-close {
  background: none;
  border: none;
  color: #fff;
  font-size: 28px;
  cursor: pointer;
  padding: 15px;
  width: 100%;
  text-align: right;
}

.menu-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.menu-list li {
  border-bottom: 1px solid #333;
}

.menu-list a {
  display: block;
  padding: 16px 20px;
  color: #fff;
  text-decoration: none;
  transition: background-color 0.2s ease;
}

.menu-list a:hover {
  background-color: #2a2a2a;
  color: #4caf50;
}

/* TOAST NOTIFICATION */
#toast-container {
  position: fixed;
  top: 70px;
  right: 20px;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 400px;
}

.toast {
  background-color: #333;
  color: #fff;
  padding: 14px 18px;
  border-radius: 6px;
  border-left: 4px solid #555;
  display: flex;
  justify-content: space-between;
  align-items: center;
  animation: slideIn 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.toast.success {
  border-left-color: #4caf50;
  background-color: #2d5016;
}

.toast.error {
  border-left-color: #f44336;
  background-color: #5c1616;
}

.toast.info {
  border-left-color: #2196f3;
  background-color: #1a3a52;
}

.toast-close {
  background: none;
  border: none;
  color: #fff;
  cursor: pointer;
  font-size: 18px;
  padding: 0;
  margin-left: 10px;
}

@keyframes slideIn {
  from {
    transform: translateX(400px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes slideOut {
  from {
    transform: translateX(0);
    opacity: 1;
  }
  to {
    transform: translateX(400px);
    opacity: 0;
  }
}

.toast.removing {
  animation: slideOut 0.3s ease forwards;
}

/* CONFIG SCREEN */
#config-screen {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.config-card {
  background-color: #333;
  padding: 20px;
  border: 1px solid #555;
  border-radius: 8px;
  text-align: center;
  width: min(92%, 380px);
}

.config-card input {
  display: block;
  margin: 10px auto;
  background-color: #444;
  color: #fff;
  border: 1px solid #555;
  padding: 6px;
  width: 100%;
}

.config-card button {
  background-color: #555;
  color: #fff;
  border: none;
  padding: 10px 20px;
  cursor: pointer;
  width: 100%;
}

.config-card button:hover {
  background-color: #666;
}

/* GAME SCREEN */
#game-screen {
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - 56px);
  padding: 8px 10px 12px;
  gap: 12px;
}

/* TUBES LAYOUT */
#tubes-container {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(60px, 72px));
  gap: 10px;
  justify-content: center;
  align-content: center;
  width: 100%;
  max-width: 900px;
  margin: 6px auto 4px auto;
}

/* TUBES SCALE */
.tube {
  width: clamp(52px, 5vw, 64px);
  height: clamp(175px, 22vw, 230px);
  border: 2px solid #555;
  border-bottom-left-radius: 25px;
  border-bottom-right-radius: 25px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(
    to top,
    rgba(255, 255, 255, 0.05),
    rgba(255, 255, 255, 0.02)
  );
}

.liquid {
  position: absolute;
  width: 100%;
  transition:
    bottom 0.35s ease,
    height 0.35s ease;
}

/* COLOR PALETTE SECTION */
#color-palette-section {
  width: 100%;
  max-width: 900px;
  margin: 8px auto 0 auto;
  display: flex;
  justify-content: center;
}

#color-palette {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  align-items: flex-end;
}

.color-square {
  width: 40px;
  height: 40px;
  cursor: pointer;
  border: 1px solid #555;
  border-radius: 2px;
  transition: all 0.2s ease;
}

.color-square:hover {
  border-color: #888;
}

.color-square.selected {
  border: 2px solid #fff;
}

.color-square-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.color-delete-btn {
  color: #fff;
  font-size: 18px;
  font-weight: bold;
  cursor: pointer;
  display: none;
  line-height: 1;
  transition: opacity 0.2s ease;
  user-select: none;
  padding: 0;
  margin: 0;
  height: 18px;
}

.color-square-wrapper:hover .color-delete-btn {
  display: block;
}

.color-delete-btn:hover {
  opacity: 0.7;
}

.color-add-btn {
  width: 40px;
  height: 40px;
  cursor: pointer;
  border: 2px solid #555;
  background-color: #444;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 24px;
  color: #fff;
  border-radius: 2px;
  transition: all 0.2s ease;
}

.color-add-btn:hover {
  border-color: #888;
  background-color: #555;
}

/* CONTROLS SECTION */
#controls-section {
  width: 100%;
  max-width: 900px;
  margin: 8px auto 0 auto;
  display: flex;
  justify-content: center;
}

#controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  width: 100%;
}

#controls button {
  background-color: #555;
  color: #fff;
  border: none;
  padding: 12px 18px;
  cursor: pointer;
  min-width: 95px;
  font-size: 14px;
  border-radius: 4px;
  transition: all 0.2s ease;
}

#controls button:hover {
  background-color: #666;
}

#solve {
  background-color: #4caf50;
  font-weight: bold;
  font-size: 16px;
  padding: 14px 28px;
  min-width: 120px;
}

#solve:hover {
  background-color: #45a049;
}

/* SOLVER PANEL */
#solver-controls {
  width: 100%;
  max-width: 900px;
  margin: 8px auto 0 auto;
  background-color: #333;
  padding: 12px;
  border: 1px solid #555;
  border-radius: 8px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

#solver-controls button {
  background-color: #555;
  color: #fff;
  border: none;
  padding: 10px 16px;
  cursor: pointer;
  min-width: 100px;
  font-size: 14px;
  border-radius: 4px;
  transition: all 0.2s ease;
}

#solver-controls button:hover {
  background-color: #666;
}

/* STATES */
.selected-tube {
  border-color: #888;
}

.glow {
  box-shadow: 0 0 10px #fff;
}

/* MOBILE — TOUCH OPTIMIZED */
@media (max-width: 600px) {
  #top-header {
    padding: 10px 0;
  }

  .header-title {
    font-size: 18px;
  }

  #game-screen {
    gap: 16px;
    padding: 10px 8px 12px;
  }

  #tubes-container {
    gap: 8px;
    margin: 4px auto 2px auto;
  }

  .tube {
    width: 48px;
    height: 160px;
  }

  #color-palette-section {
    margin: 12px auto 0 auto;
  }

  #color-palette {
    gap: 5px;
  }

  .color-square {
    width: 36px;
    height: 36px;
  }

  .color-square-wrapper {
    gap: 1px;
  }

  .color-delete-btn {
    font-size: 16px;
    height: 16px;
  }

  .color-add-btn {
    width: 36px;
    height: 36px;
    font-size: 20px;
  }

  #controls-section {
    margin: 16px auto 0 auto;
  }

  #controls {
    gap: 8px;
  }

  #controls button {
    padding: 10px 12px;
    font-size: 12px;
    min-width: 75px;
  }

  #solve {
    padding: 12px 24px;
    font-size: 14px;
    min-width: 100px;
    flex-basis: 100%;
  }

  #solver-controls {
    margin: 16px auto 0 auto;
    gap: 8px;
    padding: 10px;
  }

  #solver-controls button {
    padding: 10px 12px;
    font-size: 12px;
    min-width: 85px;
  }

  #toast-container {
    right: 8px;
    left: 8px;
    max-width: none;
    top: 66px;
  }

  .toast {
    padding: 12px 14px;
    font-size: 13px;
  }

  .side-menu {
    width: 250px;
  }

  .menu-list a {
    padding: 14px 16px;
    font-size: 15px;
  }
}

/* LARGE SCREENS */
@media (min-width: 1400px) {
  #tubes-container {
    max-width: 1100px;
  }

  #color-palette-section {
    max-width: 1100px;
  }

  #controls-section {
    max-width: 1100px;
  }

  #solver-controls {
    max-width: 1100px;
  }
}