:root {
  --bg-color: #f4eade;
  --text-color: #4a3426;
  --container-bg: #fffaf0;
  --container-border: #8b5e3c;
  --header-color: #6f4e37;
  --header-border: #d2b48c;
  --widget-bg: #fdf5e6;
  --widget-strong-text: #3b271a;
  --button-primary-bg: #d2b48c;
  --button-primary-border: #8b5e3c;
  --button-primary-hover-bg: #c1a074;
  --button-primary-active-bg: #b09060;
  --button-primary-text: #4a3426;
  --button-upgrade-bg: #a0522d;
  --button-upgrade-hover-bg: #8b4513;
  --button-disabled-bg: #cccccc;
  --feedback-text-color: #6f4e37;
  --board-bg: #eee0c1;
  --board-border: #8b5e3c;
  --slot-bg: #fffaf0;
  --slot-border: #d2b48c;
  --slot-hover-bg: #c1a074;
  --sell-zone-bg: #f0f0f0;
  --sell-zone-border: #a0a0a0;
  --sell-zone-over-bg: #d4edda;
  --sell-zone-over-border: #28a745;
  --progress-bar-bg: #6f4e37;
  --progress-bar-track-bg: #fffaf0;
  --progress-bar-track-border: #8b5e3c;
  --modal-bg: rgba(0,0,0,0.5);
  --modal-content-bg: #f4eade;
  --modal-content-border: #8b5e3c;
  --achievement-item-bg: #fffaf0;
  --achievement-item-border: #d2b48c;
  --close-button-color: #aaa;
  --close-button-hover-color: #4a3426;
  --scrollbar-track-bg: #eee0c1;
  --scrollbar-thumb-bg: #8b5e3c;
  --scrollbar-thumb-hover-bg: #6f4e37;
}

body.dark-mode {
  --bg-color: #2b2b2b;
  --text-color: #dcdcdc;
  --container-bg: #3c3c3c;
  --container-border: #6f4e37;
  --header-color: #e4d5c7;
  --header-border: #5a4b3e;
  --widget-bg: #4a4a4a;
  --widget-strong-text: #ffffff;
  --button-primary-bg: #6f5e4b;
  --button-primary-border: #9a7f64;
  --button-primary-hover-bg: #836e57;
  --button-primary-active-bg: #5c4e3e;
  --button-primary-text: #f0f0f0;
  --button-upgrade-bg: #8b5e3c;
  --button-upgrade-hover-bg: #a06a42;
  --button-disabled-bg: #555555;
  --feedback-text-color: #e0b38a;
  --board-bg: #453c32;
  --board-border: #6f4e37;
  --slot-bg: #52473c;
  --slot-border: #6a5a4a;
  --slot-hover-bg: #6a5a4a;
  --sell-zone-bg: #444444;
  --sell-zone-border: #777777;
  --sell-zone-over-bg: #2f5d39;
  --sell-zone-over-border: #3aa050;
  --progress-bar-bg: #c1a074;
  --progress-bar-track-bg: #453c32;
  --progress-bar-track-border: #6f4e37;
  --modal-bg: rgba(0,0,0,0.7);
  --modal-content-bg: #3c3c3c;
  --modal-content-border: #6f4e37;
  --achievement-item-bg: #4a4a4a;
  --achievement-item-border: #5a4b3e;
  --close-button-color: #888;
  --close-button-hover-color: #f0f0f0;
  --scrollbar-track-bg: #453c32;
  --scrollbar-thumb-bg: #8b5e3c;
  --scrollbar-thumb-hover-bg: #a06a42;
}

body {
    font-family: 'Arial', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    margin: 0;
    padding: 20px;
    min-height: 100vh;
    user-select: none; /* Prevent text selection during drag */
    transition: background-color 0.3s, color 0.3s;
}

#game-container {
    background-color: var(--container-bg);
    border: 2px solid var(--container-border);
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    width: 90%;
    max-width: 1200px;
    transition: background-color 0.3s, border-color 0.3s;
}

header {
    text-align: center;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--header-border);
    padding-bottom: 15px;
    transition: border-color 0.3s;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
}

header h1 {
    color: var(--header-color);
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: color 0.3s;
    flex-grow: 1; /* Allow h1 to take space */
    text-align: left;
}

#game-mode-container {
    margin-bottom: 0;
}

#hard-mode-button {
    background-color: #c24b4b;
    color: white;
    border: 1px solid #a03c3c;
    border-radius: 5px;
    padding: 5px 10px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background-color 0.2s;
}

#hard-mode-button:hover {
    background-color: #e05a5a;
}

.hard-mode #hard-mode-button {
    background-color: #4b8cc2;
    border-color: #3c7aa0;
}

.hard-mode #hard-mode-button:hover {
    background-color: #5aa1e0;
}

#header-info-wrapper {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
}

#theme-toggle-button,
#reset-button,
#achievements-button {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0;
    opacity: 0.5;
    transition: opacity 0.3s, transform 0.3s;
    line-height: 1;
}

#theme-toggle-button:hover,
#reset-button:hover {
    opacity: 1;
    transform: rotate(90deg);
}

#achievements-button:hover {
    opacity: 1;
    transform: scale(1.1);
}

#score-container, #cps-container {
    font-size: 1.2em;
    margin: 0;
    background-color: var(--widget-bg);
    padding: 5px 10px;
    border-radius: 5px;
    display: inline-block;
    border: 1px solid var(--header-border);
    transition: background-color 0.3s, border-color 0.3s;
}

#score, #cps {
    font-weight: bold;
    color: var(--widget-strong-text);
    transition: color 0.3s;
}

#game-body {
    display: flex;
    flex-wrap: nowrap; /* Prevent wrapping to new line */
    gap: 20px;
    align-items: flex-start;
    justify-content: center;
}

#main-game-column {
    flex: 2; /* Takes more space */
    min-width: 450px; /* Adjust as needed */
    display: flex;
    flex-direction: column;
    gap: 20px;
}

#upgrades-column {
    flex: 1;
    min-width: 250px; /* Adjust as needed */
    max-width: 320px;
    position: sticky; /* Makes it stick on scroll */
    top: 20px; /* Distance from top */
}

#main-area {
    display: flex;
    gap: 20px;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap; /* Allow wrapping on smaller screens */
}

#clicker-zone {
    flex: 0 0 160px; /* Don't grow, don't shrink, base width 160px */
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative; /* For click feedback */
}

#clicker-button {
    background-color: var(--button-primary-bg);
    border: 2px solid var(--button-primary-border);
    border-radius: 10px;
    padding: 15px;
    cursor: pointer;
    transition: transform 0.1s ease, background-color 0.2s ease, border-color 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    width: 100%;
    height: 180px;
}

#clicker-button:hover {
    background-color: var(--button-primary-hover-bg);
}

#clicker-button:active {
    transform: scale(0.95);
    background-color: var(--button-primary-active-bg);
}

#clicker-button svg {
    width: 80px;
    height: 80px;
    pointer-events: none; /* Prevent SVG from interfering with button clicks */
}

#clicker-button span {
    font-size: 1.1em;
    color: var(--button-primary-text);
    font-weight: bold;
    text-align: center;
    transition: color 0.3s;
}

/* Steam Animation */
@keyframes steam-float {
  0% { transform: translateY(0); opacity: 0.6; }
  50% { transform: translateY(-15px); opacity: 0.3; }
  100% { transform: translateY(-30px); opacity: 0; }
}

.steam {
  animation: steam-float 2s infinite ease-out;
}

#click-feedback-container {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    pointer-events: none;
    width: 100px; /* Adjust as needed */
    height: 100px; /* Adjust as needed */
}

.click-feedback {
    position: absolute;
    font-size: 1.2em;
    font-weight: bold;
    color: var(--feedback-text-color);
    opacity: 1;
    animation: float-up 1s ease-out forwards;
    transition: color 0.3s;
}

@keyframes float-up {
    0% { transform: translateY(0); opacity: 1; }
    100% { transform: translateY(-50px); opacity: 0; }
}

#merge-board-container {
    flex: 2; /* Takes up most of the space */
    min-width: 300px;
    max-width: 500px;
    background-color: var(--board-bg);
    border: 2px dashed var(--board-border);
    border-radius: 10px;
    padding: 10px 15px 15px;
    display: flex; /* Use flexbox */
    flex-direction: column; /* Stack children vertically */
    gap: 10px; /* Space between board and sell zone */
    transition: background-color 0.3s, border-color 0.3s;
}

#dropper-progress-container {
    width: 100%;
    height: 5px;
    background-color: var(--progress-bar-track-bg);
    border: 1px solid var(--progress-bar-track-border);
    border-radius: 5px;
    overflow: hidden;
    transition: background-color 0.3s, border-color 0.3s;
}

#dropper-progress-bar {
    width: 0%;
    height: 100%;
    background-color: var(--progress-bar-bg); /* Coffee color */
    transition: width 0.1s linear, background-color 0.3s; /* Smooth update */
}

#merge-board-container h2 {
    text-align: center;
    margin-top: 0;
    margin-bottom: 0;
    color: var(--header-color);
    transition: color 0.3s;
}

#merge-board {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(60px, 1fr)); /* Responsive grid */
    gap: 10px;
    min-height: 200px; /* Ensure it has some height */
}

#sell-zone {
    height: 100px;
    background-color: var(--sell-zone-bg);
    border: 2px dashed var(--sell-zone-border);
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

#sell-zone.over {
    background-color: var(--sell-zone-over-bg);
    border-color: var(--sell-zone-over-border);
    border-style: solid;
}

#sell-zone svg {
    width: 90px;
    height: 90px;
    pointer-events: none; /* Allow drop events to hit the parent div */
}

.board-slot {
    width: 60px;
    height: 60px;
    background-color: var(--slot-bg);
    border: 1px solid var(--slot-border);
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative; /* Needed for positioning items */
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.board-slot.over { /* Style when dragging over */
    background-color: var(--slot-hover-bg);
    border-style: solid;
}

.coffee-item-container {
    width: 50px;
    height: 50px;
    cursor: grab;
    transition: transform 0.2s ease;
    display: flex;
    justify-content: center;
    align-items: center;
}

.coffee-item-container.dragging {
    opacity: 0.5;
    cursor: grabbing;
    transform: scale(1.1); /* Make it slightly bigger while dragging */
    z-index: 1000; /* Ensure dragged item is on top */
}

.coffee-item-container svg {
    width: 100%;
    height: 100%;
    pointer-events: none; /* Prevent SVG from capturing drag events */
}

#upgrades-container {
    margin-top: 0;
    border-top: none;
    text-align: center;
    transition: border-color 0.3s;
    background-color: var(--container-bg); /* Add background and border for consistency */
    border: 2px solid var(--container-border);
    border-radius: 15px;
    padding: 20px;
    height: 60vh; /* Set a fixed height */
    display: flex;
    flex-direction: column;
}

#upgrades-container h2 {
     color: var(--header-color);
     margin-top: 0;
     margin-bottom: 10px;
     transition: color 0.3s;
}

#upgrades-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    overflow-y: auto; /* Make upgrades scrollable if they get too tall */
    padding-right: 5px; /* Space for scrollbar */
    flex-grow: 1; /* Allow grid to fill available space */
}

#upgrades-container button, #auto-merger-toggle-container, #auto-seller-container {
    background-color: var(--button-upgrade-bg);
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    transition: background-color 0.2s ease;
    margin: 5px;
}

#upgrades-container button:hover:not(:disabled) {
    background-color: var(--button-upgrade-hover-bg);
}

#auto-generator-status {
    background-color: var(--board-bg);
    padding: 10px 15px;
    border-radius: 5px;
    margin: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s;
}

.upgrade-label {
    color: var(--text-color);
    font-weight: bold;
    font-size: 1em;
    margin: 0;
    transition: color 0.3s;
}

.progress-bar-container {
    width: 100%;
    height: 15px;
    background-color: var(--slot-bg);
    border: 1px solid var(--container-border);
    border-radius: 5px;
    overflow: hidden;
}

.progress-bar-fill {
    width: 0%;
    height: 100%;
    background-color: var(--progress-bar-bg); /* Coffee color */
    transition: width 0.1s linear; /* Smooth update */
}

#upgrades-container button:disabled {
    background-color: var(--button-disabled-bg);
    cursor: not-allowed;
}

/* Tooltip styles (basic) */
[title]:hover::after {
  content: attr(title);
  position: absolute;
  background-color: rgba(0, 0, 0, 0.7);
  color: white;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.9em;
  white-space: nowrap;
  z-index: 10;
  /* Position tooltip - adjust as needed */
  bottom: 105%; /* Position above the element */
  left: 50%;
  transform: translateX(-50%);
}

/* --- Achievements --- */

#achievement-toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.achievement-toast {
    background-color: #fffaf0;
    border: 2px solid gold;
    border-radius: 10px;
    padding: 15px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    display: flex;
    align-items: center;
    gap: 15px;
    animation: slide-in 0.5s ease-out forwards, slide-out 0.5s ease-in 3.5s forwards;
    transform: translateX(120%);
}

@keyframes slide-in {
    to { transform: translateX(0); }
}
@keyframes slide-out {
    from { transform: translateX(0); }
    to { transform: translateX(120%); }
}

.toast-icon {
    font-size: 2.5em;
}

.toast-text h4 {
    margin: 0 0 5px 0;
    color: #6f4e37;
}

.toast-text p {
    margin: 0;
    color: #4a3426;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: var(--modal-bg);
    animation: fade-in 0.3s ease;
    transition: background-color 0.3s;
}

@keyframes fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: var(--modal-content-bg);
    margin: 10% auto;
    padding: 20px;
    border: 2px solid var(--modal-content-border);
    border-radius: 15px;
    width: 80%;
    max-width: 600px;
    position: relative;
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
    transition: background-color 0.3s, border-color 0.3s;
}

.close-button {
    color: var(--close-button-color);
    float: right;
    font-size: 28px;
    font-weight: bold;
    line-height: 1;
    transition: color 0.3s;
}

.close-button:hover,
.close-button:focus {
    color: var(--close-button-hover-color);
    text-decoration: none;
    cursor: pointer;
}

#achievements-list {
    max-height: 60vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 15px;
    padding-right: 10px;
}

.achievement-item {
    background: var(--achievement-item-bg);
    border: 1px solid var(--achievement-item-border);
    border-radius: 8px;
    padding: 10px;
    display: flex;
    align-items: center;
    gap: 15px;
    opacity: 0.5;
    filter: grayscale(80%);
    transition: background-color 0.3s, border-color 0.3s;
}

.achievement-item.unlocked {
    opacity: 1;
    filter: none;
    border-left: 5px solid gold;
}

.achievement-icon {
    font-size: 2em;
}

.achievement-details {
    text-align: left;
}

.achievement-name {
    margin: 0;
    color: var(--header-color);
    font-size: 1.1em;
    transition: color 0.3s;
}

.achievement-desc {
    margin: 5px 0 0 0;
    color: var(--text-color);
    font-size: 0.9em;
    transition: color 0.3s;
}

/* Scrollbar styling for achievements list */
#achievements-list::-webkit-scrollbar {
    width: 8px;
}
#achievements-list::-webkit-scrollbar-track {
    background: var(--scrollbar-track-bg);
    border-radius: 4px;
    transition: background-color 0.3s;
}
#achievements-list::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb-bg);
    border-radius: 4px;
    transition: background-color 0.3s;
}
#achievements-list::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover-bg);
}

#upgrades-grid::-webkit-scrollbar {
    width: 8px;
}
#upgrades-grid::-webkit-scrollbar-track {
    background: var(--scrollbar-track-bg);
    border-radius: 4px;
    transition: background-color 0.3s;
}
#upgrades-grid::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb-bg);
    border-radius: 4px;
    transition: background-color 0.3s;
}
#upgrades-grid::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover-bg);
}