:root {
    /* "Fresh Dining" Palette */
    --bg-color: #f8f9fa;        /* Very light grey, clean background */
    --text-color: #2d3436;      /* Soft black for better readability */
    --card-bg: #ffffff;
    --accent-color: #ff7675;    /* Soft Coral/Salmon - Warm & Appetizing */
    --accent-hover: #d63031;    /* Darker Red for interactions */
    --secondary-color: #00b894; /* Mint Green for positive values/money */
    --border-color: #dfe6e9;
    --input-bg: #f1f2f6;
    
    --shadow-sm: 0 2px 5px rgba(0,0,0,0.05);
    --shadow-md: 0 8px 15px rgba(0,0,0,0.1);
}

body.dark-mode {
    --bg-color: #2d3436;
    --text-color: #dfe6e9;
    --card-bg: #353b48;
    --accent-color: #fab1a0;    /* Lighter peach for dark mode */
    --accent-hover: #ff7675;
    --secondary-color: #55efc4;
    --border-color: #636e72;
    --input-bg: #2d3436;
    
    --shadow-sm: 0 2px 5px rgba(0,0,0,0.2);
    --shadow-md: 0 8px 15px rgba(0,0,0,0.3);
}

body {
    font-family: 'Poppins', 'Segoe UI', Tahoma, sans-serif; /* Poppins is very popular for modern apps */
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 40px 20px;
    transition: all 0.3s ease;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--card-bg);
    padding: 30px;
    border-radius: 20px; /* Softer, rounder corners */
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 2px dashed var(--border-color); /* Dashed line looks like a receipt */
}

h1 { 
    margin: 0; 
    font-size: 1.8rem; 
    color: var(--accent-color);
    font-weight: 700;
    letter-spacing: -0.5px;
}

button#theme-toggle {
    background: var(--input-bg);
    border: none;
    color: var(--text-color);
    padding: 10px 18px;
    border-radius: 50px;
    cursor: pointer;
    font-weight: 600;
    transition: transform 0.2s;
    box-shadow: var(--shadow-sm);
}

button#theme-toggle:hover {
    transform: translateY(-2px);
    background: var(--border-color);
}

/* Rates Section - Styled like a Dashboard */
.rates-section {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-bottom: 30px;
    padding: 20px;
    background: var(--input-bg);
    border-radius: 16px;
    border: 1px solid var(--border-color);
}

.rate-group label { 
    display: block; 
    font-size: 0.75rem; 
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px; 
    opacity: 0.8;
}

.rate-group input { 
    width: 100%; 
    padding: 10px; 
    border: 2px solid transparent; 
    border-radius: 8px;
    background: var(--card-bg);
    color: var(--text-color);
    font-weight: bold;
    font-size: 1rem;
    box-sizing: border-box; /* Fixes padding width issues */
    transition: border-color 0.2s;
}

.rate-group input:focus {
    outline: none;
    border-color: var(--accent-color);
}

/* Calendar Grid */
.calendar-header {
    display: grid;
    grid-template-columns: 0.5fr 1fr 1fr 1fr;
    font-weight: 700;
    padding: 15px 10px;
    background: var(--accent-color);
    color: white; /* Header is now filled for better separation */
    border-radius: 12px 12px 0 0;
    text-align: center;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.day-row {
    display: grid;
    grid-template-columns: 0.5fr 1fr 1fr 1fr;
    padding: 12px 10px;
    border-bottom: 1px solid var(--border-color);
    align-items: center;
    text-align: center;
    transition: background-color 0.2s;
}

.day-row:nth-child(even) {
    background-color: rgba(0,0,0,0.02); /* Very subtle striping */
}

.day-row:hover {
    background-color: rgba(255, 118, 117, 0.1); /* Slight accent tint on hover */
}

/* Custom Checkboxes */
input[type="checkbox"] {
    width: 22px;
    height: 22px;
    cursor: pointer;
    accent-color: var(--secondary-color); /* Green checkboxes for "Success/Eaten" */
    border-radius: 4px;
}

/* Summary Footer - "The Bill" Look */
.summary-footer {
    margin-top: 30px;
    padding: 25px;
    background: var(--card-bg); /* Keep it white/card color */
    border: 2px solid var(--accent-color); /* Outline instead of fill */
    border-radius: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    bottom: 20px; /* Floats slightly if page is long */
    box-shadow: var(--shadow-md);
}

.total-box { 
    text-align: center; 
    color: var(--text-color);
}

.total-box span { 
    display: block; 
    font-size: 0.8rem; 
    text-transform: uppercase; 
    color: var(--accent-color);
    font-weight: bold;
}

.total-box strong { 
    font-size: 1.6rem; 
    color: var(--secondary-color);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 15px;
    margin-top: 25px;
}

.btn-pdf, .btn-clear {
    flex: 1;
    padding: 14px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 700;
    font-size: 1rem;
    color: white;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    justify-content: center;
    align-items: center;
}

.btn-pdf { 
    background-color: var(--text-color); /* Dark button for serious action */
}

.btn-clear { 
    background-color: #ff7675; /* Warning color but softer */
    color: white;
}

.btn-pdf:hover, .btn-clear:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

@media (max-width: 600px) {
    .rates-section { grid-template-columns: 1fr; }
    .calendar-header, .day-row { font-size: 0.85rem; }
    .summary-footer { flex-direction: column; gap: 20px; text-align: center; }
    .container { padding: 15px; }
}