:root {
    --bg: #f8f9fa;
    --card: #fff;
    --text: #333;
    --heading: #2c3e50;
    --heading-secondary: #34495e;
    --accent: #3498db;
    --accent-hover: #2980b9;
    --success: #27ae60;
    --success-hover: #229954;
    --error: #e74c3c;
    --muted: #6c757d;
    --muted-hover: #5a6268;
    --border: #ddd;
    --code-bg: #f4f4f4;
    --success-bg: #d4edda;
    --success-text: #155724;
    --error-bg: #f8d7da;
    --error-text: #721c24;
    --hover-bg: #e3f2fd;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

html.dark {
    --bg: #0f172a;
    --card: #1e293b;
    --text: #f1f5f9;
    --heading: #3b82f6;
    --heading-secondary: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --success: #22c55e;
    --success-hover: #16a34a;
    --error: #ef4444;
    --muted: #64748b;
    --muted-hover: #475569;
    --border: #334155;
    --code-bg: #1e293b;
    --success-bg: #065f46;
    --success-text: #d1fae5;
    --error-bg: #7f1d1d;
    --error-text: #fecaca;
    --hover-bg: #1e40af;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family:
        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--bg);
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
    transition:
        background-color 0.3s ease,
        color 0.3s ease;
}

/* Main heading */
h1 {
    color: var(--heading);
    margin-bottom: -10px;
    padding-bottom: 3px;
    border-bottom: 3px solid var(--accent);
    font-size: 2.2em;
}

h2 {
    color: var(--heading-secondary);
    margin: 30px 0 20px 0;
    font-size: 1.5em;
}

h3 {
    color: var(--heading-secondary);
    margin: 25px 0 15px 0;
    font-size: 1.3em;
}

/* Links and buttons */
a {
    color: var(--accent);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

a:hover {
    background-color: var(--hover-bg);
    text-decoration: none;
}

/* Primary action link (Submit New Problem) */
a[href="/problem/new"] {
    background-color: var(--accent);
    color: white;
    font-weight: 600;
    margin-bottom: 30px;
    display: inline-block;
    padding: 12px 24px;
    border-radius: 8px;
}

a[href="/problem/new"]:hover {
    background-color: var(--accent-hover);
}

/* Problem list */
ul {
    list-style: none;
    background: var(--card);
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 25px;
    margin: 20px 0;
    transition: background-color 0.3s ease;
}

li {
    padding: 15px 0;
    border-bottom: 1px solid var(--border);
}

li:last-child {
    border-bottom: none;
}

li a {
    display: block;
    padding: 12px 20px;
    margin: -12px -20px;
    border-radius: 6px;
    font-size: 1.1em;
}

li a:hover {
    background-color: var(--hover-bg);
    transform: translateX(5px);
    transition: all 0.2s ease;
}

/* Problem page specific styles */
.problem-header {
    display: flex;
    align-items: center;
    margin-bottom: 30px;
    gap: 20px;
}

.back-btn {
    background-color: var(--muted);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.back-btn:hover {
    background-color: var(--muted-hover);
}

.problem-desc {
    background: var(--card);
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
    font-size: 1.1em;
    line-height: 1.7;
    transition: background-color 0.3s ease;
}

/* Editor section */
.editor-section {
    background: var(--card);
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
    transition: background-color 0.3s ease;
}

#editor {
    border: 2px solid var(--border);
    border-radius: 8px;
    margin: 20px 0;
    height: 400px;
    overflow: hidden;
}

.editor-actions {
    margin-top: 20px;
    text-align: right;
}

form button[type="submit"] {
    background-color: var(--success);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: background-color 0.3s ease;
}

form button[type="submit"]:hover {
    background-color: var(--success-hover);
}

/* Results section */
b {
    color: var(--heading);
    display: inline-block;
    margin: 10px 0 5px 0;
}

pre {
    background-color: var(--code-bg);
    padding: 20px;
    border-radius: 6px;
    border-left: 4px solid var(--accent);
    margin: 10px 0 20px 0;
    overflow-x: auto;
    font-family: "JetBrains Mono", "Courier New", monospace;
    font-size: 14px;
    line-height: 1.4;
    border: 1px solid var(--border);
    transition: background-color 0.3s ease;
}

pre[style*="color:red"] {
    border-left-color: var(--error);
    background-color: var(--error-bg);
}

/* Status messages */
p[style*="color:green"] {
    background-color: var(--success-bg);
    color: var(--success-text);
    padding: 15px 20px;
    border-radius: 6px;
    border-left: 4px solid var(--success);
    margin: 20px 0;
    font-weight: 600;
}

p[style*="color:red"] {
    background-color: var(--error-bg);
    color: var(--error-text);
    padding: 15px 20px;
    border-radius: 6px;
    border-left: 4px solid var(--error);
    margin: 20px 0;
    font-weight: 600;
}

/* Back to Problems link */
a[href="/"] {
    display: inline-block;
    margin-top: 30px;
    background-color: var(--muted);
    color: white;
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 500;
}

a[href="/"]:hover {
    background-color: var(--muted-hover);
}

/* Responsive design */
@media (max-width: 768px) {
    body {
        padding: 15px;
    }

    .problem-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }

    h1 {
        font-size: 1.8em;
    }

    .problem-desc,
    .editor-section,
    ul {
        padding: 20px;
    }

    #editor {
        height: 300px;
    }

    .editor-actions {
        text-align: center;
    }
}