/* --- Google Font Import --- */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;600&display=swap');

/* --- Root Variables (New Theme) --- */
:root {
    --background-color: #0D1117; /* Dark Navy Blue */
    --primary-glow: #00aaff;
    --secondary-glow: #ff4500; /* Accent Orange */
    --text-color: #c9d1d9;
    --text-light: #f0f6fc;
    --border-color: rgba(13, 135, 204, 0.3);
    --container-bg: rgba(22, 27, 34, 0.8);

    --wall-color: var(--primary-glow);
    --path-color: transparent; /* Path is the absence of walls */
    --solution-color: var(--secondary-glow);
    --visited-color: rgba(0, 170, 255, 0.15); /* Slightly reduced alpha */
}

/* --- General Body & Typography --- */
body {
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: 'Poppins', sans-serif;
    font-weight: 300;
    margin: 0;
    background-image: linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 20px 20px;
}

/* --- Header & Navigation --- */
header {
    width: 100%;
    text-align: center;
    padding: 25px 0;
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(180deg, rgba(22, 27, 34, 0.5) 0%, rgba(22, 27, 34, 0) 100%);
}

header h1 {
    color: var(--text-light);
    font-weight: 600;
    letter-spacing: 1px;
    text-shadow: 0 0 8px var(--primary-glow);
}

nav {
    margin-top: 15px;
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    margin: 0 15px;
    padding: 8px 15px;
    border-radius: 5px;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

nav a:hover {
    color: var(--text-light);
    border-color: var(--border-color);
    text-shadow: 0 0 5px var(--primary-glow);
}

nav a.active {
    color: var(--text-light);
    background-color: var(--primary-glow);
    box-shadow: 0 0 10px var(--primary-glow);
    border-color: var(--primary-glow);
}

/* --- Main Content & Containers --- */
main {
    width: 90%;
    max-width: 1300px;
    margin: 30px auto 0;
    padding-bottom: 50px;
}

.controls {
    display: flex;
    gap: 20px;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

/* --- Cards & Grid Items --- */
.algorithm-card, .compare-item, #playground-container .controls {
    background-color: var(--container-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 25px;
    backdrop-filter: blur(5px);
    transition: all 0.3s ease;
}

.algorithm-card:hover, .compare-item:hover {
    border-color: var(--primary-glow);
    box-shadow: 0 0 15px var(--border-color);
}

.algorithm-card h3, .compare-item h4, #playground-container h4, #legend h4, #stats-container h4 {
    margin-top: 0;
    color: var(--text-light);
    font-weight: 600;
    text-shadow: 0 0 5px var(--primary-glow);
}

/* --- Buttons & Inputs --- */
button, select {
    background-color: var(--container-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'Poppins', sans-serif;
}

button:hover, select:hover {
    border-color: var(--primary-glow);
    color: var(--text-light);
}

button {
    background-color: var(--primary-glow);
    color: #0D1117;
    font-weight: 600;
    border-color: var(--primary-glow);
}

button:hover {
    box-shadow: 0 0 10px var(--primary-glow);
}

/* --- Canvas & Maze --- */
canvas {
    background-color: var(--path-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-top: 20px;
    box-shadow: inset 0 0 15px rgba(0,0,0,0.5);
}

.mini-playground canvas {
    display: block;
    margin: 20px auto 15px auto;
}

/* --- Specific Layouts --- */
#overview-container, .solver-race-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 25px;
}

#compare-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 25px;
}

.compare-item canvas {
    width: 100%;
    height: auto;
    display: block;
    aspect-ratio: 1 / 1;
}

#playground-container {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 30px;
    align-items: start;
}

#playground-container .controls {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

#playground-container .controls label {
    font-weight: 400;
    color: var(--primary-glow);
}

#playground-container #maze-canvas {
    width: 100%;
    height: auto;
    aspect-ratio: 1 / 1;
    max-width: 80vh;
    max-height: 80vh;
    margin: 0;
}

/* --- Legend & Stats --- */
#legend, #stats-container {
    width: 100%;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

.legend-item, .stats-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9em;
    margin-bottom: 8px;
}

.legend-color {
    width: 20px;
    height: 20px;
    border: 1px solid var(--border-color);
    border-radius: 3px;
}

.stats-item span:first-child {
    color: #aaa;
}

.stats-item span:last-child {
    font-weight: 600;
    min-width: 50px;
    text-align: right;
    color: var(--text-light);
}