:root {
    --primary-color: #0d0d2b; /* Deep space blue */
    --secondary-color: #2a2a4a; /* Slightly lighter blue */
    --accent-color: #00ffff; /* Cyan / Neon blue */
    --text-color: #e0e0e0; /* Light grey */
    --input-bg: #1a1a3a;
    --input-border: #3a3a5a;
    --button-hover-bg: #00e6e6;
    --button-hover-text: #0d0d2b;
    --font-main: 'Roboto', sans-serif;
    --font-heading: 'Orbitron', sans-serif;
    --glow-color: rgba(0, 255, 255, 0.5);
    --bg-line-color: rgba(0, 255, 255, 0.15); /* Color for background lines */
    --bg-particle-color: rgba(0, 255, 255, 0.5); /* Color for background particles */
    --quantum-color: #9400d3; /* Dark Violet for QuantumLeap */
    --quantum-glow: rgba(148, 0, 211, 0.6);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-main);
    background-color: var(--primary-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    overflow: hidden; /* Prevent scrollbars */
}

#canvas {
    position: fixed; /* Use fixed to cover viewport */
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1; /* Place canvas behind everything */
}

.search-container {
    background-color: rgba(42, 42, 74, 0.85); /* secondary with transparency */
    backdrop-filter: blur(10px);
    border: 1px solid var(--input-border);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3), 0 0 20px var(--glow-color);
    width: 100%;
    max-width: 700px; /* Slightly wider to accommodate results */
    transition: max-width 0.5s ease; /* Smooth transition if results appear */
    text-align: center;
    z-index: 1; /* Ensure container is above the canvas */
    animation: float-in 0.8s ease-out forwards;
    opacity: 0;
    transform: translateY(20px);
}

@keyframes float-in {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.header {
    margin-bottom: 30px;
}

.header h1 {
    font-family: var(--font-heading);
    color: var(--accent-color);
    font-size: 2.5em;
    margin-bottom: 10px;
    text-shadow: 0 0 10px var(--glow-color);
    letter-spacing: 2px;
}

.header p {
    font-size: 1.1em;
    color: var(--text-color);
    opacity: 0.8;
}

.search-form {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

#search-query {
    flex-grow: 1;
    padding: 15px 50px 15px 50px; /* Left padding for icon, right for clear */
    font-size: 1.1em;
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 8px;
    color: var(--text-color);
    outline: none;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

#search-query:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 15px var(--glow-color);
}

#search-query::placeholder {
    color: rgba(224, 224, 224, 0.6);
}

.search-icon {
    position: absolute;
    left: 15px;
    width: 24px;
    height: 24px;
    color: var(--accent-color);
    opacity: 0.7;
}

.clear-button {
    position: absolute;
    right: 10px;
    width: 30px;
    height: 30px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-color);
    opacity: 0; /* Hidden by default, controlled by JS */
    pointer-events: none; /* Prevent clicking when invisible */
    transition: opacity 0.3s ease, color 0.3s ease;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
}

.clear-button svg {
    width: 20px;
    height: 20px;
}

.clear-button:hover {
    color: var(--accent-color);
}

.engine-selector {
    text-align: left;
}

.engine-selector label:first-child { /* "Search Engine:" label */
    display: block;
    margin-bottom: 10px;
    font-weight: bold;
    color: var(--accent-color);
    opacity: 0.9;
    font-size: 1em;
}

.radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center; /* Center items */
}

.engine-selector input[type="radio"] {
    display: none; /* Hide actual radio button */
}

.engine-label {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 15px;
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-color);
    opacity: 0.8;
}

.engine-label svg {
    width: 20px;
    height: 20px;
}
.engine-label span {
     line-height: 1; /* Ensure text aligns nicely with icon */
}


.engine-label:hover {
    background-color: var(--secondary-color);
    border-color: #5a5a7a;
    opacity: 1;
}

.engine-selector input[type="radio"]:checked + .engine-label {
    background-color: var(--accent-color);
    color: var(--primary-color);
    border-color: var(--accent-color);
    box-shadow: 0 0 10px var(--glow-color);
    opacity: 1;
    font-weight: bold;
}

.engine-selector input[type="radio"]:checked + .engine-label.quantumleap {
    background-color: var(--quantum-color);
    color: white;
    border-color: var(--quantum-color);
    box-shadow: 0 0 10px var(--quantum-glow);
}
.engine-selector input[type="radio"]:checked + .engine-label.quantumleap svg {
    filter: brightness(0) invert(1); /* Make icon white */
}

.engine-selector input[type="radio"]:checked + .engine-label.google { 
    background-color: #4285F4; 
    color: white; 
    border-color: #4285F4; 
    box-shadow: 0 0 10px rgba(66, 133, 244, 0.7);}
.engine-selector input[type="radio"]:checked + .engine-label.duckduckgo { 
    background-color: #DE5833; 
    color: white; 
    border-color: #DE5833; 
    box-shadow: 0 0 10px rgba(222, 88, 51, 0.7);}
.engine-selector input[type="radio"]:checked + .engine-label.bing { 
    background-color: #008373; 
    color: white; 
    border-color: #008373; 
    box-shadow: 0 0 10px rgba(0, 131, 115, 0.7);}
.engine-selector input[type="radio"]:checked + .engine-label.brave { 
    background-color: #FF210A; 
    color: white; 
    border-color: #FF210A; 
    box-shadow: 0 0 10px rgba(255, 33, 10, 0.7);}
.engine-selector input[type="radio"]:checked + .engine-label.brave svg {
    /* Ensure Brave logo keeps its color when selected */
    filter: none;
}

.engine-selector input[type="radio"]:checked + .engine-label svg {
    filter: brightness(0) invert(1); /* Make icon white */
}
.engine-selector input[type="radio"]:checked + .engine-label.google svg {
     filter: none; /* Keep original colors */
}
.engine-selector input[type="radio"]:checked + .engine-label.bing svg {
     filter: none; /* Keep original colors */
}

.search-button {
    padding: 15px 30px;
    font-size: 1.2em;
    font-weight: bold;
    font-family: var(--font-heading);
    background: linear-gradient(45deg, var(--accent-color), #00cccc);
    color: var(--primary-color);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    box-shadow: 0 5px 15px rgba(0, 255, 255, 0.3);
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative; /* Needed for spinner pseudo-element */
    overflow: hidden; /* Hide spinner parts outside button */
}

.search-button:hover {
    background: linear-gradient(45deg, var(--button-hover-bg), #00ffff);
    box-shadow: 0 8px 25px var(--glow-color);
    transform: translateY(-3px);
}

.search-button:active {
    transform: translateY(-1px);
    box-shadow: 0 3px 10px rgba(0, 255, 255, 0.4);
}

.search-button .button-icon {
    width: 20px;
    height: 20px;
    transition: transform 0.3s ease;
}

.search-button:hover .button-icon {
    transform: translateX(5px);
}

.footer {
    margin-top: 30px;
    font-size: 0.9em;
    color: var(--text-color);
    opacity: 0.6;
}

.search-results-container {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--input-border);
    text-align: left;
    max-height: 40vh; /* Limit height */
    overflow-y: auto; /* Allow scrolling */
    display: none; /* Hidden by default */
    color: var(--text-color);
    opacity: 0;
    transition: opacity 0.5s ease;
}

.search-results-container.visible {
    display: block;
    opacity: 1;
}

.search-results-container::-webkit-scrollbar {
    width: 8px;
}
.search-results-container::-webkit-scrollbar-track {
    background: var(--secondary-color);
    border-radius: 4px;
}
.search-results-container::-webkit-scrollbar-thumb {
    background-color: var(--accent-color);
    border-radius: 4px;
    border: 2px solid var(--secondary-color);
}
.search-results-container::-webkit-scrollbar-thumb:hover {
    background-color: var(--button-hover-bg);
}

.result-item {
    background-color: rgba(42, 42, 74, 0.6); /* secondary with transparency */
    border: 1px solid var(--input-border);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 15px;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.result-item:hover {
     background-color: var(--secondary-color);
     border-color: var(--accent-color);
     transform: translateY(-2px); /* Subtle lift on hover */
     box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.result-item h3 {
    margin: 0 0 8px 0;
    font-size: 1.1em;
}

.result-item h3 a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.result-item h3 a:hover {
    color: var(--button-hover-bg);
    text-decoration: underline;
}

.result-item p {
    margin: 0 0 8px 0;
    font-size: 0.95em;
    opacity: 0.9;
    line-height: 1.5;
}

.result-item .result-link {
    font-size: 0.85em;
    color: #aaa; /* Lighter grey for the URL */
    word-break: break-all;
    margin-top: 5px; /* Add some space above the link */
    opacity: 0.8;
}

.loading-message, .error-message, .no-results-message {
    text-align: center;
    padding: 30px 15px; /* More padding */
    font-style: italic;
    opacity: 0.9;
    font-size: 1.1em; /* Slightly larger */
    display: flex; /* Use flex for centering spinner */
    justify-content: center;
    align-items: center;
    gap: 10px;
}

.error-message {
    color: #ff8787; /* Softer red for errors */
    background-color: rgba(255, 107, 107, 0.1);
    border: 1px solid rgba(255, 107, 107, 0.3);
    border-radius: 8px;
}

.no-results-message {
     color: var(--accent-color);
     opacity: 0.8;
}

/* Simple CSS Spinner */
.spinner {
  width: 20px;
  height: 20px;
  border: 3px solid rgba(0, 255, 255, 0.3); /* Lighter cyan border */
  border-top-color: var(--accent-color); /* Solid cyan top */
  border-radius: 50%;
  animation: spin 1s linear infinite;
  display: inline-block; /* Make it inline with text */
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}


@media (max-width: 640px) {
     .search-container {
        padding: 30px 20px; /* Adjust padding */
        margin: 15px;
     }
    .header h1 {
        font-size: 2em;
    }
     .radio-group {
        justify-content: center; /* Keep centered or flex-start */
     }
    .engine-label {
        padding: 8px 12px;
        font-size: 0.9em;
    }
    .search-button {
        padding: 12px 25px;
        font-size: 1.1em;
    }
}

@media (max-width: 400px) {
    .header h1 {
        font-size: 1.8em;
    }
     .header p {
        font-size: 1em;
    }
    #search-query {
        padding: 12px 45px 12px 45px;
        font-size: 1em;
    }
     .search-icon {
        left: 12px;
        width: 20px;
        height: 20px;
     }
    .clear-button {
        right: 8px;
        width: 26px;
        height: 26px;
    }
    .clear-button svg {
        width: 18px;
        height: 18px;
    }
    .radio-group {
         gap: 8px;
    }
     .engine-label {
        padding: 7px 10px;
        gap: 5px;
     }
     .engine-label svg {
        width: 18px;
        height: 18px;
     }
     .search-button {
        padding: 10px 20px;
        font-size: 1em;
     }
}