:root {
    --bg-color: #f4f7f6;
    --text-color: #333333;
    --heading-color: #2c3e50;
    --card-bg: #ffffff;
    --card-shadow: rgba(0, 0, 0, 0.05);
    --code-bg: #e8f8f5;
    --code-text: #2c3e50;
    --muted-text: #7f8c8d;
    --countdown-color: #e74c3c;
    --permanent-border: #f39c12;
    --permanent-glow: rgba(243, 156, 18, 0.2);
    --toast-bg: #27ae60;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --heading-color: #ffffff;
    --card-bg: #1e1e1e;
    --card-shadow: rgba(0, 0, 0, 0.5);
    --code-bg: #2d3748;
    --code-text: #63b3ed;
    --muted-text: #a0aec0;
    --countdown-color: #fc8181;
    --permanent-border: #f1c40f; 
    --permanent-glow: rgba(241, 196, 15, 0.3);
    --toast-bg: #2ecc71;
}

.btn-control {
    background-color: var(--card-bg);
    color: var(--text-color);
    border: 1px solid var(--muted-text);
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn-control:hover {
    opacity: 0.8;
}

.btn-img{
    height: 11px;
}

.controls-container {
    display: flex;
    gap: 15px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 50px 20px;
    margin: 0;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.header-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 1000px;
    margin-bottom: 30px;
}

h1 {
    color: var(--heading-color);
    margin: 0 0 15px 0;
    text-align: center;
}