:root {
    /* Light Theme */
    --primary-color: #4facfe;
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --bg-gradient: linear-gradient(to right, #e0eafc 0%, #cfdef3 100%); /* Light background */
    --card-bg: rgba(255, 255, 255, 0.95);
    --text-main: #333;
    --text-secondary: #666;
    --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.1);
    --shadow-inset: inset -3px -3px 7px rgba(255,255,255,0.7), inset 2px 2px 5px rgba(0,0,0,0.1);
    --header-text: #333; /* Darker text for light header */
    --footer-text: #666;
    --date-badge-bg: #f0f2f5;
    --lotto-machine-bg: #f8f9fa;
    --lotto-row-bg: white;
    --calendar-day-bg: #fff;
    --calendar-day-hover-bg: #f0f0f0;
    --calendar-day-active-bg: var(--primary-color);
    --calendar-day-text: var(--text-main);
    --calendar-day-inactive-text: #ccc;
    --calendar-border-color: rgba(0,0,0,0.05);
}

body.dark-mode {
    /* Dark Theme */
    --primary-color: #92b4ec;
    --primary-gradient: linear-gradient(135deg, #89c4f4 0%, #4a91e0 100%);
    --bg-gradient: linear-gradient(to right, #2c3e50 0%, #4a69bd 100%); /* Dark background */
    --card-bg: rgba(45, 52, 54, 0.95);
    --text-main: #f5f6fa;
    --text-secondary: #b2bec3;
    --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.5);
    --shadow-inset: inset -3px -3px 7px rgba(0,0,0,0.5), inset 2px 2px 5px rgba(255,255,255,0.1);
    --header-text: #f5f6fa; /* Lighter text for dark header */
    --footer-text: #b2bec3;
    --date-badge-bg: #4a5a6a;
    --lotto-machine-bg: #3f5164;
    --lotto-row-bg: #3f5164;
    --calendar-day-bg: #2d3436;
    --calendar-day-hover-bg: #3c4446;
    --calendar-day-active-bg: var(--primary-color);
    --calendar-day-text: var(--text-main);
    --calendar-day-inactive-text: #555;
    --calendar-border-color: rgba(255,255,255,0.1);
}

body {
    font-family: 'Poppins', sans-serif;
    background: var(--bg-gradient);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    color: var(--text-main);
    transition: background 0.3s ease, color 0.3s ease;
}

.main-wrapper {
    width: 100%;
    max-width: 600px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px; /* Space between card and calendar */
}

/* Header */
.app-header {
    text-align: center;
    color: var(--header-text);
    margin-bottom: 20px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
    position: relative; /* For theme switch positioning */
    width: 100%;
}

/* Theme Switch Styles */
.theme-switch-wrapper {
    position: absolute;
    top: 20px;
    right: 20px;
}

.theme-switch {
    display: inline-block;
    height: 34px;
    position: relative;
    width: 60px;
}

.theme-switch input {
    display: none;
}

.slider {
    background-color: #ccc;
    bottom: 0;
    left: 0;
    right: 0;
    top: 0;
    cursor: pointer;
    position: absolute;
    transition: 0.4s;
}

.slider:before {
    background-color: #fff;
    bottom: 4px;
    content: "";
    height: 26px;
    left: 4px;
    position: absolute;
    transition: 0.4s;
    width: 26px;
}

input:checked + .slider {
    background-color: #2196f3;
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

.logo-area {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.logo-icon {
    font-size: 2.5rem;
}

h1 {
    font-size: 2.5rem;
    margin: 0;
    font-weight: 700;
    letter-spacing: -1px;
}

.subtitle {
    margin: 5px 0 0;
    font-size: 1rem;
    opacity: 0.9;
    font-weight: 400;
}

/* Card */
.card {
    background: var(--card-bg);
    width: 100%;
    border-radius: 20px;
    box-shadow: var(--shadow-soft);
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.card-header {
    padding: 20px 30px;
    border-bottom: 1px solid rgba(0,0,0,0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h2 {
    margin: 0;
    font-size: 1.2rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.date-badge {
    background: var(--date-badge-bg);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
}

/* Dinner Recommendation Styles */
.dinner-recommendation {
    padding: 30px 20px;
    background: var(--lotto-machine-bg); /* Reusing for similar background purpose */
    min-height: 300px;
    display: flex;
    flex-direction: column; /* To stack category and recommendation */
    justify-content: center;
    align-items: center;
    text-align: center;
    border-radius: 0 0 20px 20px; /* Adjust border-radius if card has top radius */
}

.recommendation-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    min-height: 150px;
    padding: 20px;
    border-radius: 15px;
    background: var(--lotto-row-bg); /* Reusing for inner container background */
    box-shadow: var(--shadow-soft);
    transition: all 0.3s ease;
}

.recommendation-container p {
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-main);
    margin: 0;
}

.initial-message {
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-style: italic;
}

.category-text {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.recommendation-text {
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-main);
    margin: 0;
}

.meal-image {
    max-width: 80%;
    height: auto;
    border-radius: 10px;
    margin-top: 15px;
    box-shadow: var(--shadow-soft);
}

/* Footer & Button */
.card-footer {
    padding: 20px 30px;
    background: var(--lotto-row-bg);
    display: flex;
    justify-content: center;
    border-top: 1px solid rgba(0,0,0,0.05);
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    padding: 15px 40px;
    border: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.btn-primary:active {
    transform: translateY(1px);
}

.app-footer {
    margin-top: 30px;
    color: var(--footer-text);
    font-size: 0.8rem;
    text-align: center;
}

/* Animations */
@keyframes fade-in {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fade-in 0.5s ease-out forwards;
}

/* Calendar Styles */
.calendar-section {
    width: 100%;
    margin-top: 20px;
}

.calendar-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.calendar-nav .date-badge {
    min-width: 150px;
    text-align: center;
}

.calendar-nav .btn-icon {
    background: var(--primary-gradient);
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: opacity 0.3s ease;
}

.calendar-nav .btn-icon:hover {
    opacity: 0.8;
}

.calendar-grid-container {
    padding: 15px;
    background: var(--lotto-row-bg); /* Reusing for background */
    border-radius: 15px;
    box-shadow: var(--shadow-soft);
}

.weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 10px;
    text-align: center;
}

.weekdays span {
    padding: 8px 0;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 5px;
}

.calendar-day {
    background: var(--calendar-day-bg);
    border-radius: 8px;
    padding: 10px 5px;
    min-height: 80px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    font-size: 0.9rem;
    color: var(--calendar-day-text);
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s ease;
    border: 1px solid var(--calendar-border-color);
    position: relative;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: normal; /* Allow text to wrap */
}

.calendar-day:hover {
    background: var(--calendar-day-hover-bg);
    transform: translateY(-2px);
}

.calendar-day.inactive {
    color: var(--calendar-day-inactive-text);
    background: var(--calendar-day-hover-bg);
    cursor: not-allowed;
}

.calendar-day .day-number {
    font-weight: 700;
    margin-bottom: 5px;
    color: var(--text-main);
}

.calendar-day .meal-entry {
    font-size: 0.75rem;
    color: var(--primary-color);
    font-weight: 500;
    text-align: center;
    word-break: break-word; /* Break long words */
}

.calendar-day.selected {
    background: var(--calendar-day-active-bg);
    color: white;
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.calendar-day.selected .day-number,
.calendar-day.selected .meal-entry {
    color: white;
}