/* --- Modern Dark Theme UI --- */

:root {
    --bg-primary: #0d1117; /* Dark background */
    --bg-secondary: #161b22; /* Panel background */
    --bg-tertiary: #21262d; /* Input/interactive element background */
    --border-color: #30363d;
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --text-muted: #484f58;
    --accent-color: #58a6ff; /* Bright blue for links and highlights */
    --accent-hover: #79c0ff;
    --success-color: #3fb950; /* Green for score/victory */
    --success-hover: #4cc263;
    --font-family: 'Inter', sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    margin: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    line-height: 1.6;
}

/* --- Header & Footer --- */
header {
    text-align: center;
    padding: 2rem 1rem 1rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0;
    letter-spacing: -0.5px;
    background: linear-gradient(to right, var(--accent-color), var(--success-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

footer {
    padding: 1.5rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

/* --- Main Layout --- */
main {
    flex-grow: 1;
    padding: 2rem;
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

.game-board {
    width: 100%;
    max-width: 800px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* --- Panels --- */
.info-panel {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1rem;
}

.panel {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.panel:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

.panel h2 {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin: 0 0 1rem 0;
    letter-spacing: 0.5px;
}

.panel p {
    font-size: 1.1rem;
    font-weight: 500;
    min-height: 2.5rem;
    margin: 0;
}

.panel a {
    color: var(--accent-color);
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

.panel a:hover {
    color: var(--accent-hover);
}

/* --- Stats Bar --- */
.stats-bar {
    display: flex;
    justify-content: space-around;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
}

.stat {
    text-align: center;
}

.stat-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.score-display .stat-value {
    color: var(--success-color);
}

/* --- Gameplay Area --- */
.gameplay-area {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
}

#path-display h3 {
    margin-top: 0;
    font-size: 1rem;
    color: var(--text-secondary);
}

#path-list {
    list-style: none;
    padding: 0;
    margin: 0 0 1.5rem 0;
    max-height: 120px;
    overflow-y: auto;
}

#path-list li {
    background-color: var(--bg-tertiary);
    padding: 0.75rem;
    border-radius: 6px;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    border-left: 3px solid var(--accent-color);
}

#move-form {
    display: flex;
    gap: 0.75rem;
}

#move-form input {
    flex-grow: 1;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    border-radius: 6px;
    font-size: 1rem;
    font-family: var(--font-family);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

#move-form input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.1);
}

#move-form input::placeholder {
    color: var(--text-muted);
}

/* --- Buttons --- */
button {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease;
    font-family: var(--font-family);
}

button:hover:not(:disabled) {
    background-color: var(--accent-hover);
}

button:active:not(:disabled) {
    transform: scale(0.98);
}

button:disabled {
    background-color: var(--text-muted);
    cursor: not-allowed;
}

#game-control-btn {
    background-color: var(--success-color);
    font-size: 1.1rem;
    padding: 1rem 2.5rem;
}

#game-control-btn:hover:not(:disabled) {
    background-color: var(--success-hover);
}

/* --- Victory Modal --- */
#victory-message {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

#victory-message:not(.hidden) {
    opacity: 1;
    visibility: visible;
}

.victory-content {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2.5rem;
    text-align: center;
    max-width: 400px;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

#victory-message:not(.hidden) .victory-content {
    transform: scale(1);
}

.victory-content h2 {
    font-size: 2rem;
    margin: 0 0 1rem 0;
}

.final-score-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.final-score-value {
    font-size: 3rem;
    font-weight: 700;
    color: var(--success-color);
    margin: 0.5rem 0 2rem 0;
}

/* --- Paused State Overlay --- */
body.paused::after {
    content: 'PAUSED';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    color: var(--text-primary);
    font-size: 4rem;
    font-weight: 700;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 50;
    pointer-events: none;
    letter-spacing: 5px;
    opacity: 0.9;
}