:root {
    --primary-color: #8bc34a;
    --primary-light: #dcedc8;
    --primary-dark: #689f38;
    --text-color: #333;
    --light-text: #666;
    --bg-color: #f9f9f9;
    --card-bg: #fff;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    --border-radius: 8px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--primary-light);
}

h1 {
    color: var(--primary-dark);
    font-weight: 600;
}

.header-buttons {
    display: flex;
    gap: 15px;
}

.icon-button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.icon-button:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

.settings-container {
    position: relative;
}

.settings-menu {
    position: absolute;
    top: 50px;
    right: 0;
    background-color: var(--card-bg);
    box-shadow: var(--shadow);
    border-radius: var(--border-radius);
    padding: 10px;
    display: none;
    flex-direction: column;
    width: 150px;
    z-index: 10;
}

.settings-menu button {
    padding: 10px;
    text-align: left;
    background: none;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-color);
}

.settings-menu button:hover {
    background-color: var(--primary-light);
}

.items-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.item-card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 20px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.item-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.item-actions {
    position: absolute;
    top: 10px;
    right: 10px;
    display: none;
    gap: 5px;
}

.item-card:hover .item-actions {
    display: flex;
}

.action-button {
    background: none;
    border: none;
    font-size: 16px;
    cursor: pointer;
    color: var(--light-text);
    transition: var(--transition);
}

.action-button:hover {
    color: var(--primary-dark);
}

.item-name {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--primary-dark);
    display: inline-block;
}

.item-dates {
    font-size: 14px;
    color: var(--light-text);
    margin-bottom: 15px;
}

.item-progress-container {
    background-color: var(--primary-light);
    height: 20px;
    border-radius: 5px;
    margin-top: 15px;
    overflow: hidden;
    position: relative;
}

.item-progress-bar {
    height: 100%;
    background-color: var(--primary-color);
    border-radius: 5px;
    transition: width 0.5s ease;
}

.item-elapsed {
    position: absolute;
    left: 8px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 12px;
    font-weight: 500;
    color: white;
    text-shadow: 0 0 2px rgba(0, 0, 0, 0.5);
}

.item-remaining {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 12px;
    font-weight: 500;
    color: white;
    text-shadow: 0 0 2px rgba(0, 0, 0, 0.5);
}

.item-description {
    display: inline-block;
    font-size: 12px;
    color: var(--light-text);
    margin-left: 10px;
}

.modal {
    display: none;
    position: fixed;
    z-index: 100;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
    background-color: var(--card-bg);
    margin: 5% auto;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    width: 90%;
    max-width: 500px;
    animation: modalFade 0.3s;
}

@keyframes modalFade {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.close-button {
    color: var(--light-text);
    float: right;
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
}

.close-button:hover {
    color: var(--primary-dark);
}

h2 {
    margin-bottom: 20px;
    color: var(--primary-dark);
}

.form-group {
    margin-bottom: 20px;
}

.date-time-group {
    margin-bottom: 20px;
}

.date-time-inputs {
    display: flex;
    gap: 10px;
}

.date-time-inputs input {
    flex: 1;
}

label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-color);
}

input, textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 16px;
    transition: var(--transition);
}

input:focus, textarea:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 2px rgba(139, 195, 74, 0.2);
}

.submit-button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    padding: 12px 20px;
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
}

.submit-button:hover {
    background-color: var(--primary-dark);
}

/* Responsive design */
@media (max-width: 768px) {
    .items-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    header {
        flex-direction: row;
        align-items: center;
    }
    
    .header-buttons {
        width: auto;
        justify-content: flex-end;
    }
    
    .modal-content {
        width: 95%;
        margin: 10% auto;
        padding: 20px;
    }
    
    .date-time-inputs {
        flex-direction: row;
    }
}

@media (min-width: 769px) {
    .items-container {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 480px) {
    .items-container {
        grid-template-columns: 1fr;
    }
}