:root {
    --primary-color: #00f7ff;
    --secondary-color: #181c20;
    --accent-color: #ffb400;
    --text-color: #fff;
    --header-bg: #000;
    --footer-bg: #000;
    --border-radius: 10px;
    --shadow: 0 2px 16px #00f7ff33;
    --transition: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
    --focus-ring: 0 0 0 2px #00f7ff88;
    --neon-glow: 0 0 8px #00f7ff, 0 0 16px #00f7ff44;
    --fadein: fadein 0.5s cubic-bezier(0.4,0,0.2,1);
    --font-main: 'Orbitron', 'Segoe UI', 'Arial', sans-serif;
}

body, .algovis-main {
    background: #000 !important;
}

@keyframes fadein {
    from { opacity: 0; transform: translateY(30px) scale(0.98); }
    to { opacity: 1; transform: none; }
}

.algovis-header {
    font-family: var(--font-main);
    background: var(--header-bg);
    color: #00f7ff;
    padding: 0.7rem 1rem 0.5rem 1rem;
    box-shadow: none;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    border-bottom: 1px solid #00f7ff44;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.algovis-header h1 {
    margin: 0 0 0.2rem 0;
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: #00f7ff;
    text-shadow: 0 1px 4px #00f7ff44;
}

.algovis-header nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    gap: 1.2rem;
}

.algovis-header nav a {
    color: #00f7ff;
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    padding: 0.1rem 0.5rem;
    border-radius: 5px;
    transition: background var(--transition), color var(--transition);
}

.algovis-header nav a:hover,
.algovis-header nav a:focus {
    background: var(--accent-color);
    color: #000;
    outline: none;
}

.algovis-main {
    animation: var(--fadein);
    font-family: var(--font-main);
    background: #000;
    color: var(--text-color);
    max-width: 600px;
    margin: 1.5rem auto;
    border-radius: var(--border-radius);
    box-shadow: 0 0 32px 4px #00f7ff88, 0 8px 32px #000a, 0 1.5px 6px #a259ff33;
    border: 1.5px solid #00f7ff;
    background: #000;
    position: relative;
    z-index: 1;
    /* Floating effect */
    transition: box-shadow 0.25s cubic-bezier(0.4,0,0.2,1), transform 0.18s cubic-bezier(0.4,0,0.2,1);
}
.algovis-main:hover {
    box-shadow: 0 0 48px 8px #00f7ffcc, 0 16px 48px #000c, 0 2px 12px #a259ff55;
    transform: translateY(-4px) scale(1.01);
}

.algovis-controls {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    flex-wrap: wrap;
    margin-bottom: 0.5rem;
    background: #111;
    border-radius: var(--border-radius);
    padding: 0.5rem 0.7rem;
    box-shadow: none;
    font-family: var(--font-main);
}

.algovis-controls label {
    font-weight: 600;
    font-size: 1rem;
    color: #00f7ff;
}

.algovis-controls select,
.algovis-controls button {
    font-family: var(--font-main);
    box-shadow: none;
    border: 1.2px solid #00f7ff88;
    outline: none;
    transition: box-shadow var(--transition), border-color var(--transition), background var(--transition), color var(--transition), transform 0.13s cubic-bezier(0.4,0,0.2,1);
    background: #000;
    color: #00f7ff;
    margin-right: 0.2rem;
    border-radius: 7px;
    font-size: 1rem;
    padding: 0.35rem 0.7rem;
}

.algovis-controls select:focus,
.algovis-controls button:focus {
    border-color: var(--accent-color);
    box-shadow: var(--focus-ring);
}

/* Dropdown (select) improvements for all browsers */
.algovis-controls select {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background: #000;
    color: #a259ff;
    border: 1.5px solid #00f7ff;
    border-radius: 7px;
    padding: 0.35rem 2.2rem 0.35rem 0.7rem;
    font-size: 1rem;
    font-family: var(--font-main);
    box-shadow: 0 0 8px #00f7ff44;
    position: relative;
    transition: border-color var(--transition), box-shadow var(--transition), color var(--transition);
    cursor: pointer;
    outline: none;
}
.algovis-controls select:focus {
    border-color: #a259ff;
    box-shadow: 0 0 0 2px #a259ff88, var(--focus-ring);
    outline: none;
}
.algovis-controls select option {
    background: #111 !important;
    color: #a259ff !important;
    font-family: var(--font-main);
}
/* For Chromium browsers: force dropdown list color */
.algovis-controls select:focus option,
.algovis-controls select:active option {
    color: #a259ff !important;
    background: #111 !important;
}
/* For Firefox: force dropdown list color */
.algovis-controls select:-moz-focusring option {
    color: #a259ff !important;
    background: #111 !important;
}
/* Custom dropdown arrow */
.algovis-controls select {
    background-image: url('data:image/svg+xml;utf8,<svg fill="%23a259ff" height="20" viewBox="0 0 20 20" width="20" xmlns="http://www.w3.org/2000/svg"><path d="M7.293 7.293a1 1 0 011.414 0L10 8.586l1.293-1.293a1 1 0 111.414 1.414l-2 2a1 1 0 01-1.414 0l-2-2a1 1 0 010-1.414z"/></svg>');
    background-repeat: no-repeat;
    background-position: right 0.7rem center;
    background-size: 1.1em;
}
/* Neon border for open dropdown (Chromium) */
.algovis-controls select:focus {
    box-shadow: 0 0 0 2px #a259ffcc, 0 0 8px #00f7ff88;
}
/* Neon border for open dropdown (Firefox) */
.algovis-controls select:-moz-focusring {
    box-shadow: 0 0 0 2px #a259ffcc, 0 0 8px #00f7ff88;
}
/* Scrollbar styling for dropdowns (Webkit) */
.algovis-controls select option::-webkit-scrollbar {
    width: 8px;
    background: #111;
}
.algovis-controls select option::-webkit-scrollbar-thumb {
    background: #a259ff;
    border-radius: 4px;
}

.algovis-controls button {
    font-weight: 700;
    letter-spacing: 0.5px;
    background: linear-gradient(90deg, #00f7ff 60%, #a259ff 100%);
    color: #000;
    border: none;
    cursor: pointer;
    box-shadow: 0 0 12px #00f7ff88, 0 2px 16px #a259ff44;
    border-radius: 7px;
    transition: background var(--transition), color var(--transition), box-shadow var(--transition), transform 0.18s cubic-bezier(0.4,0,0.2,1);
    position: relative;
    z-index: 1;
}
.algovis-controls button:hover,
.algovis-controls button:focus {
    background: linear-gradient(90deg, #a259ff 60%, #00f7ff 100%);
    color: #fff;
    box-shadow: 0 0 24px #a259ffcc, 0 4px 32px #00f7ff88;
    transform: translateY(-3px) scale(1.06);
    outline: none;
}

.algovis-canvas {
    animation: var(--fadein);
    box-shadow: 0 0 32px 8px #00f7ffcc, 0 8px 32px #a259ff44, 0 2px 16px #000a;
    border: 2.5px solid #00f7ff;
    background: rgba(0,0,0,0.85);
    border-radius: var(--border-radius);
    min-height: 220px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.2rem 1rem;
    position: relative;
    z-index: 2;
    /* Glassy effect */
    backdrop-filter: blur(2.5px) saturate(1.2);
    transition: box-shadow 0.22s cubic-bezier(0.4,0,0.2,1), transform 0.18s cubic-bezier(0.4,0,0.2,1);
}
.algovis-canvas:hover {
    box-shadow: 0 0 48px 16px #00f7ff, 0 16px 48px #a259ff77, 0 4px 24px #000c;
    transform: translateY(-2px) scale(1.01);
}

#visualization-area {
    width: 100%;
    min-height: 160px;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 4px;
    border-radius: 12px;
    background: rgba(0,0,0,0.92);
    box-shadow: 0 0 24px 4px #00f7ff99, 0 2px 12px #a259ff33;
    padding: 0.5rem 0.2rem;
    position: relative;
    z-index: 3;
    /* Glassy effect */
    backdrop-filter: blur(1.5px) saturate(1.1);
}

/* Info panel and headings polish */
.algovis-info {
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
    background: #0a0a13;
    border-radius: var(--border-radius);
    padding: 0.9rem 1.1rem 0.7rem 1.1rem;
    color: #00f7ff;
    font-size: 1.01rem;
    box-shadow: 0 0 12px #00f7ff22, 0 1.5px 6px #a259ff22;
    border: 1.2px solid #00f7ff33;
}
.algorithm-info {
    display: flex;
    gap: 1.2rem;
    margin-bottom: 0.3rem;
}
.algorithm-info h3 {
    color: #ffb400;
    font-size: 1.09rem;
    margin: 0 0 0.2rem 0;
    letter-spacing: 0.5px;
    text-shadow: 0 1px 4px #a259ff33;
}
.complexity-info, .steps-info, .status-info {
    flex: 1;
    background: #18122b;
    border-radius: 7px;
    padding: 0.4rem 0.7rem;
    margin-right: 0.5rem;
    box-shadow: 0 0 8px #00f7ff22;
    color: #fff;
}
.complexity-info:last-child, .steps-info:last-child, .status-info:last-child {
    margin-right: 0;
}
.algorithm-details {
    margin-top: 0.2rem;
    color: #fff;
    font-size: 0.99rem;
    background: #18122b;
    border-radius: 7px;
    padding: 0.5rem 0.8rem;
    box-shadow: 0 0 8px #a259ff22;
}

.algovis-footer {
    font-family: var(--font-main);
    background: var(--footer-bg);
    color: #00f7ff;
    text-align: center;
    padding: 0.7rem 0.5rem 0.5rem 0.5rem;
    margin-top: auto;
    border-top: 1px solid #00f7ff44;
    border-radius: 0 0 var(--border-radius) var(--border-radius);
    box-shadow: none;
    font-size: 0.95rem;
}

.algovis-footer h2 {
    margin-top: 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: #ffb400;
}

.algovis-footer p {
    margin: 0.3rem 0 0 0;
    font-size: 0.97rem;
    opacity: 0.88;
}

.algovis-controls label,
.algovis-controls select,
.algovis-controls button {
    color: #111;
    font-family: var(--font-main);
}

/* Custom Dropdown Styles */
.custom-dropdown {
    position: relative;
    display: inline-block;
    min-width: 160px;
    margin-right: 0.5rem;
    font-family: var(--font-main);
    z-index: 10;
}
.dropdown-selected {
    background: #000;
    color: #a259ff;
    border: 1.5px solid #00f7ff;
    border-radius: 7px;
    padding: 0.35rem 2.2rem 0.35rem 0.7rem;
    font-size: 1rem;
    box-shadow: 0 0 8px #00f7ff44;
    cursor: pointer;
    transition: border-color var(--transition), box-shadow var(--transition), color var(--transition);
    position: relative;
    outline: none;
    user-select: none;
}
.custom-dropdown:focus .dropdown-selected,
.dropdown-selected:focus {
    border-color: #a259ff;
    box-shadow: 0 0 0 2px #a259ff88, var(--focus-ring);
}
.dropdown-list {
    display: none;
    position: absolute;
    left: 0;
    top: 110%;
    min-width: 100%;
    background: #18122b;
    border: 1.5px solid #a259ff;
    border-radius: 7px;
    box-shadow: 0 0 16px #a259ff88, 0 2px 16px #00f7ff44;
    z-index: 100;
    padding: 0.2rem 0;
    margin-top: 2px;
    animation: fadein 0.18s cubic-bezier(0.4,0,0.2,1);
}
.dropdown-option {
    color: #a259ff;
    background: transparent;
    padding: 0.35rem 1.2rem 0.35rem 0.7rem;
    font-size: 1rem;
    font-family: var(--font-main);
    cursor: pointer;
    transition: background 0.13s, color 0.13s;
    border-radius: 5px;
    user-select: none;
}
.dropdown-option:hover,
.dropdown-option:focus {
    background: #00f7ff33;
    color: #fff;
}
.custom-dropdown.open .dropdown-list {
    display: block;
}

/* Data Structures Playground - Moved to dedicated dataStructures.css file */

@media (max-width: 800px) {
    .algovis-main {
        padding: 0.7rem 0.2rem;
        font-size: 0.97rem;
        max-width: 98vw;
    }
    .algovis-controls {
        flex-direction: column;
        align-items: stretch;
        gap: 0.7rem;
        padding: 0.5rem 0.2rem;
    }
    .algovis-header {
        padding: 0.7rem 0.2rem 0.5rem 0.2rem;
    }
}

@media (max-width: 500px) {
    .algovis-header h1 {
        font-size: 1.05rem;
    }
    .algovis-main {
        padding: 0.2rem 0.1rem;
        font-size: 0.93rem;
    }
    .algovis-controls {
        padding: 0.2rem 0.1rem;
    }
    .algovis-footer {
        padding: 0.5rem 0.1rem 0.3rem 0.1rem;
    }
}