:root {
    /* Light theme variables */
    --bg-color: #f4f4f4;
    --container-bg: #ffffff;
    --text-color: #333333;
    --input-bg: #ffffff;
    --input-border: #cccccc;
    --button-bg: #000000;
    --button-text: #ffffff;
    --button-hover-bg: #ffffff;
    --button-hover-text: #000000;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --disabled-bg: #e9ecef;
    --result-bg: #f8f9fa;
}

[data-theme="dark"] {
    /* Dark theme variables */
    --bg-color: #1a1a1a;
    --container-bg: #2d2d2d;
    --text-color: #ffffff;
    --input-bg: #3d3d3d;
    --input-border: #4d4d4d;
    --button-bg: #ffffff;
    --button-text: #000000;
    --button-hover-bg: #000000;
    --button-hover-text: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --disabled-bg: #404040;
    --result-bg: #363636;
}

/* Theme toggle button styles */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 10px;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--button-bg);
    color: var(--button-text);
    box-shadow: 0 2px 5px var(--shadow-color);
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
    background-color: var(--button-hover-bg);
    color: var(--button-hover-text);
}

.theme-toggle i {
    font-size: 20px;
    transition: color 0.3s ease;
}

/* General button styles */
button {
    background-color: var(--button-bg);
    color: var(--button-text);
    cursor: pointer;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    font-size: 16px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 5px var(--shadow-color);
}

button:hover {
    background-color: var(--button-hover-bg);
    color: var(--button-hover-text);
    transform: translateY(-2px);
}

/* Calculate and Reset buttons specific styles */
.calculate-btn, .reset-btn {
    width: 100%;
    padding: 12px 20px;
    font-weight: bold;
    letter-spacing: 0.5px;
}

/* General styles */
body {
    font-family: Arial, sans-serif;
    background-color: var(--bg-color);
    padding: 20px;
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    background-color: var(--container-bg);
    box-shadow: 0 0 10px var(--shadow-color);
    border-radius: 10px;
    font-size: 16px;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

/* Typography */
.title {
    margin-bottom: 20px;
    text-align: center;
    color: var(--text-color);
}

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

h2 {
    text-align: center;
    color: var(--text-color);
}

/* Form elements */
label {
    font-weight: bold;
    margin-top: 10px;
    display: block;
    color: var(--text-color);
}

input[type="number"],
input[type="text"],
input[type="email"],
select {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border-radius: 5px;
    border: 1px solid var(--input-border);
    background-color: var(--input-bg);
    color: var(--text-color);
    box-sizing: border-box;
    transition: all 0.3s ease;
}

input[readonly] {
    background-color: var(--disabled-bg);
    cursor: not-allowed;
}

/* Results and display */
.result {
    font-size: 16px;
    font-weight: bold;
    margin-top: 20px;
    text-align: center;
    color: var(--text-color);
    padding: 15px;
    background-color: var(--result-bg);
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.time-display {
    font-size: 14px;
    margin-bottom: 10px;
    color: var(--text-color);
    opacity: 0.8;
}

/* Overtime section styles */
.overtime-section {
    margin: 20px 0;
    padding: 15px;
    background-color: var(--container-bg);
    border-radius: 5px;
    border: 1px solid var(--input-border);
}

.overtime-section {
    margin: 20px 0;
    padding: 15px;
    background-color: var(--container-bg);
    border-radius: 5px;
    border: 1px solid var(--input-border);
}

.overtime-header {
    margin-bottom: 15px;
}

.overtime-header h3 {
    margin: 0;
    color: var(--text-color);
}

.overtime-input {
    display: flex;
    gap: 10px;
    align-items: center;
    margin-bottom: 10px;
}

.overtime-input label {
    min-width: 80px;
    margin: 0;
}

.overtime-input input {
    flex: 1;
    margin: 0;
}

/* Form container */
.form-container {
    margin-bottom: 20px;
}

.form-container input,
.form-container select {
    margin-bottom: 15px;
}

/* Button group */
.button-group {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.button-group button {
    flex: 1;
}

/* Error Message style */

input,
select {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border-radius: 5px;
    border: 1px solid #cccccc;  /* Default border color */
    background-color: var(--input-bg);
    color: var(--text-color);
    box-sizing: border-box;
    outline: none;
}

input:invalid,
select:invalid {
    border-color: #cccccc;
    box-shadow: none;
    outline: none;
}

input:focus,
select:focus {
    border-color: #666666;
    box-shadow: none;
    outline: none;
}

input.error-field,
select.error-field {
    border-color: #ff4444;
}

.error {
    color: #ff4444;
    font-size: 12px;
    margin-top: -8px;
    margin-bottom: 10px;
    display: none;
}

.error.show {
    display: block;
}

.submission-status {
    padding: 10px;
    border-radius: 5px;
    margin-top: 15px;
    font-weight: bold;
    text-align: center;
}

.submission-status.success {
    background-color: rgba(75, 181, 67, 0.1);
    color: #4BB543;
    border: 1px solid #4BB543;
}

.submission-status.error {
    background-color: rgba(255, 68, 68, 0.1);
    color: #ff4444;
    border: 1px solid #ff4444;
}

/* Footer */
.footer {
    margin-top: 20px;
    padding: 10px;
    color: var(--text-color);
    opacity: 0.8;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        max-width: 100%;
        margin: 10px;
        padding: 15px;
    }
    
    .theme-toggle {
        top: 10px;
        right: 10px;
    }

    .button-group {
        flex-direction: column;
        gap: 10px;
    }

    .overtime-input {
        flex-direction: column;
        align-items: stretch;
        gap: 5px;
    }
    
    .overtime-input label {
        min-width: auto;
    }
}