/* --- GOOGLE FONTS IMPORT --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&family=Fira+Code:wght@400;500&display=swap');

:root {
    /* --- DARK MODE (Default) --- */
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    
    --accent-green: #10b981;
    --accent-red: #ef4444;
    --accent-pivot: #f59e0b;
    --bar-color: #6366f1;
    --bar-gradient: linear-gradient(to top, #4338ca, #6366f1);
    
    --border-color: #334155;
    --btn-bg: #334155;
    --btn-hover: #475569;
    
    --code-bg: #0f172a;
    --line-highlight: #334155;
    --line-border: #f59e0b;
    --shadow-soft: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.15);
}

/* --- LIGHT MODE VARIABLES --- */
body.light-mode {
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    
    --accent-green: #10b981;
    --accent-red: #ef4444;
    --accent-pivot: #f59e0b;
    --bar-color: #3b82f6;
    --bar-gradient: linear-gradient(to top, #2563eb, #60a5fa);
    
    --border-color: #e2e8f0;
    --btn-bg: #f1f5f9;
    --btn-hover: #e2e8f0;
    
    --code-bg: #f8fafc;
    --line-highlight: #e0f2fe;
    --line-border: #3b82f6;
    --shadow-soft: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

* {
    box-sizing: border-box;
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100vh;
    overflow: hidden;
    margin: 0;
    padding: 10px 20px 20px 20px;
}

/* --- NAVIGATION --- */
.nav-link {
    position: absolute;
    top: 25px;
    left: 25px;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: 12px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-soft);
    z-index: 10;
}

.nav-link:hover {
    color: var(--text-primary);
    border-color: var(--bar-color);
    transform: translateY(-2px);
}

/* --- THEME TOGGLE BUTTON --- */
.theme-toggle {
    position: absolute;
    top: 25px;
    right: 25px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-soft);
    z-index: 10;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.theme-toggle:hover {
    transform: scale(1.1) rotate(15deg);
    border-color: var(--accent-pivot);
    box-shadow: 0 0 15px rgba(245, 158, 11, 0.3);
}

.theme-toggle svg {
    width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}

/* --- HEADER --- */
header {
    text-align: center;
    margin-top: 50px;
    margin-bottom: 15px;
    flex-shrink: 0;
    width: 100%;
    max-width: 650px;
}

h1 {
    margin: 0;
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.05em;
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 5px;
}

/* --- STATS --- */
.complexity-stats {
    display: inline-flex;
    gap: 20px;
    justify-content: center;
    font-size: 0.8rem;
    font-family: 'Fira Code', monospace;
    color: var(--bar-color);
    background: var(--card-bg);
    padding: 6px 18px;
    border-radius: 50px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-soft);
    margin-top: 5px;
}

/* --- CONTROLS --- */
.controls {
    margin-bottom: 15px;
    display: flex;
    gap: 10px;
    align-items: center;
    justify-content: center;
    background: var(--card-bg);
    padding: 10px 20px;
    border-radius: 14px;
    border: 1px solid var(--border-color);
    flex-wrap: wrap;
    box-shadow: var(--shadow-soft);
    flex-shrink: 0;
}

button {
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.85rem;
    transition: all 0.2s;
    color: white;
}

button:hover:not(:disabled) {
    transform: translateY(-2px);
    filter: brightness(110%);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

button#resetBtn { background-color: var(--text-secondary); }
button#startBtn { background-color: var(--accent-green); }
button#pauseBtn { background-color: var(--accent-pivot); color: #0f172a; }
button#continueBtn { background-color: var(--bar-color); }

button:disabled {
    background-color: var(--border-color) !important;
    color: var(--text-secondary) !important;
    cursor: not-allowed;
    transform: none;
    opacity: 0.5;
}

.speed-control {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-left: 10px;
    border-left: 1px solid var(--border-color);
    padding-left: 15px;
}

input[type="range"] {
    width: 100px;
    cursor: pointer;
    accent-color: var(--bar-color);
}

/* --- MAIN CONTENT --- */
.main-content {
    display: flex;
    flex-direction: row;
    gap: 20px;
    width: 100%;
    max-width: 1200px;
    flex: 1; 
    min-height: 0;
    margin-bottom: 15px;
}

/* Chart */
.chart-wrapper {
    flex: 1;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    box-shadow: var(--shadow-soft);
    height: 100%;
    min-height: 200px; 
    position: relative;
    overflow: hidden;
}

.chart-container {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 4px;
    height: 100%;
    width: 100%;
}

.bar {
    flex: 1;
    background: var(--bar-gradient);
    transition: height 0.15s ease;
    border-radius: 4px 4px 0 0;
    position: relative;
}

.bar.compare { background: var(--accent-red); box-shadow: 0 0 15px var(--accent-red); z-index: 2;}
.bar.pivot { background: var(--accent-pivot); box-shadow: 0 0 15px var(--accent-pivot); z-index: 3;}
.bar.min { background: var(--accent-pivot); box-shadow: 0 0 15px var(--accent-pivot); z-index: 3;}
.bar.active { background: var(--accent-red); opacity: 0.8; }
.bar.sorted { background: var(--accent-green); box-shadow: 0 0 10px var(--accent-green); }

/* Code Window */
.code-window {
    flex: 1;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-soft);
    height: 100%;
    overflow: hidden;
}

.window-header {
    background-color: var(--bg-color);
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.dots { display: flex; gap: 8px; }
.dot { width: 10px; height: 10px; border-radius: 50%; }
.red { background: #ff5f56; } .yellow { background: #ffbd2e; } .green { background: #27c93f; }

#status-text {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--text-secondary);
    text-transform: uppercase;
}

pre {
    margin: 0; padding: 15px; font-size: 0.85rem; line-height: 1.5; color: var(--text-primary);
    overflow: auto; flex-grow: 1; font-family: 'Fira Code', monospace;
}

.code-line { display: block; padding: 2px 10px; border-left: 3px solid transparent; border-radius: 0 4px 4px 0; }
.code-line.active-line { background-color: var(--line-highlight); border-left-color: var(--accent-pivot); }

.kw { color: #ff7b72; font-weight: bold; } body.light-mode .kw { color: #d73a49; }
.var { color: #79c0ff; } body.light-mode .var { color: #005cc5; }
.num { color: #d2a8ff; } body.light-mode .num { color: #6f42c1; }
.func { color: #d2a8ff; } body.light-mode .func { color: #6f42c1; }
.comment { color: #6a737d; font-style: italic; }

/* --- INFO BOX --- */
details.info-box {
    width: 100%; max-width: 1200px; margin: 0 auto 10px auto; color: var(--text-secondary);
    font-size: 0.85rem; border: 1px solid var(--border-color); border-radius: 12px;
    background: var(--card-bg); transition: all 0.3s ease; box-shadow: var(--shadow-soft);
    z-index: 5; flex-shrink: 0;
}
details.info-box[open] { border-color: var(--bar-color); }
summary { padding: 10px 20px; font-weight: 600; cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; color: var(--text-primary); }
summary::after { content: '+'; font-size: 1.2rem; font-weight: bold; transition: transform 0.3s ease; color: var(--bar-color); }
details[open] summary::after { transform: rotate(45deg); color: var(--accent-red); }
summary::-webkit-details-marker { display: none; }
.info-content { padding: 0 20px 15px 20px; border-top: 1px solid var(--border-color); line-height: 1.6; color: var(--text-secondary); text-align: left; animation: slideUp 0.3s ease; }
@keyframes slideUp { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: translateY(0); } }
.info-content strong { color: var(--text-primary); }
.info-content ul { margin: 5px 0; padding-left: 20px; }
.info-content li { margin-bottom: 4px; }

@media (max-width: 900px), (max-height: 700px) {
    body { height: auto; overflow: auto; }
    .main-content { flex-direction: column; height: auto; flex-grow: 0; }
    .chart-wrapper, .code-window { height: 300px; min-height: 300px; }
    .nav-link { position: static; margin-bottom: 20px; align-self: flex-start; }
    .theme-toggle { position: absolute; top: 20px; right: 20px; }
    header { margin-top: 10px; }
}