body {
    font-family: 'Roboto', sans-serif;
    background-color: #f0f4f0; /* Light greenish-gray */
    color: #333;
    line-height: 1.6;
    margin: 0;
}

.app-container {
    max-width: 900px;
    margin: 30px auto;
    padding: 20px;
}

/* Header */
.app-header {
    text-align: center;
    margin-bottom: 40px;
}

.app-header h1 {
    font-family: 'Merriweather', serif;
    font-size: 2.8rem;
    color: #2e6b2e; /* Dark Green */
    margin: 0;
}

.app-header p {
    font-size: 1.2rem;
    color: #556b55; /* Muted Green */
}

/* Main Tool Area & Content Guide */
.scheduler-tool > *, .content-guide {
    background-color: #ffffff;
    border-radius: 12px;
    padding: 30px;
    margin-bottom: 25px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

/* Card Headings */
.controls-card h2, .duration-card h2, .schedule-output-card h2, .content-guide h2 {
    font-family: 'Merriweather', serif;
    color: #2e6b2e;
    margin-top: 0;
    border-bottom: 2px solid #e8f0e8;
    padding-bottom: 15px;
}

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

.input-group:last-child {
    margin-bottom: 0;
}

.input-group label {
    font-weight: bold;
    margin-bottom: 12px;
    color: #555;
    display: block;
}

.input-group input[type="date"], .input-group select {
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 1rem;
    width: 100%;
    box-sizing: border-box;
    background-color: white;
}

/* Duration Buttons */
.duration-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.duration-btn {
    flex-grow: 1;
    padding: 12px 15px;
    font-size: 1rem;
    font-weight: bold;
    background-color: #f0f4f0;
    color: #2e6b2e;
    border: 2px solid #d9e9d9;
    border-radius: 8px;
    cursor: pointer;
    text-align: center;
    transition: background-color 0.2s, color 0.2s;
}

.duration-btn.active, .duration-btn:hover {
    background-color: #2e6b2e; /* Dark Green */
    color: #ffffff;
    border-color: #2e6b2e;
}

/* Schedule Output */
.schedule-list {
    margin-top: 20px;
}

.schedule-list .placeholder {
    color: #888;
    font-style: italic;
}

.schedule-item {
    padding: 15px;
    background-color: #f9fdf9;
    border-left: 5px solid #68a068; /* Softer Green */
    margin-bottom: 10px;
    border-radius: 0 8px 8px 0;
}

.schedule-item:nth-child(even) {
    background-color: #f4faf4;
}

/* Export Section */
.export-section {
    text-align: center;
    margin-top: 30px;
}

.export-btn {
    background-color: #2e6b2e; /* Dark Green */
    color: white;
    font-size: 1.1rem;
    font-weight: bold;
    padding: 15px 30px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: background-color 0.3s, transform 0.2s;
}

.export-btn:hover:not(:disabled) {
    background-color: #245524; /* Darker Green */
    transform: translateY(-2px);
}

.export-btn:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}

.export-note {
    font-size: 0.9rem;
    color: #777;
    margin-top: 15px;
    font-style: italic;
}

/* Content Guide Section */
.content-guide h3 {
    font-family: 'Merriweather', serif;
    color: #3e8e41; /* Brighter Green */
    margin-top: 30px;
}

.content-guide p,
.content-guide li {
    color: #444;
    font-size: 1.05rem;
}

.content-guide ol,
.content-guide ul {
    padding-left: 20px;
    margin-top: 10px;
}

.content-guide ol li {
    margin-bottom: 15px;
}

.content-guide ul li {
    margin-bottom: 12px;
}

.content-guide .disclaimer {
    margin-top: 30px;
    padding: 15px;
    background-color: #fefaf0;
    border-left: 5px solid #f0ad4e; /* Warning yellow */
    font-style: italic;
}

/* Footer */
.app-footer {
    text-align: center;
    margin-top: 50px;
    color: #777;
}

.app-footer a {
    color: #2e6b2e;
    text-decoration: none;
}

.app-footer a:hover {
    text-decoration: underline;
}