:root {
    /* New modern, cool-toned palette */
    --bg-start: #0b132b;
    --bg-end: #1c2541;
    --card-color: rgba(28, 37, 65, 0.7); /* Semi-transparent */
    --primary-color: #3a506b;
    --accent-color: #5bc0be;
    --success-color: #6fffd2;
    --text-color: #f0f8ff; /* AliceBlue, soft white */
    --text-muted-color: #a9b4c2;
    --border-color: #3a506b;
    --shadow-color: rgba(0, 0, 0, 0.25);
    --font-family: 'Noto Sans TC', sans-serif;
}

body {
    font-family: var(--font-family);
    /* Smooth gradient background */
    background: linear-gradient(135deg, var(--bg-start), var(--bg-end));
    background-attachment: fixed;
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    line-height: 1.7; /* Improved readability */
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    /* Glassmorphism effect */
    background-color: var(--card-color);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 16px; /* Softer corners */
    box-shadow: 0 8px 32px 0 var(--shadow-color);
}

header {
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
    margin-bottom: 40px; /* Increased spacing */
}

header h1 {
    color: var(--accent-color);
    margin: 0;
    font-size: 2.5em; /* Larger title */
    font-weight: 700;
    letter-spacing: 1px;
}

header p {
    color: var(--text-muted-color);
    font-size: 1.1em;
    margin-top: 10px;
}

#input-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.input-group {
    display: flex;
    flex-direction: column;
}

.input-group label {
    margin-bottom: 10px; /* More spacing */
    font-weight: bold;
    color: var(--text-muted-color);
    font-size: 0.9em;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

input[type="date"], select {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-start); /* Darker input background */
    color: var(--text-color);
    font-size: 1em;
    font-family: var(--font-family);
    box-sizing: border-box; /* From previous step */
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

/* Style for the date picker icon */
input[type="date"]::-webkit-calendar-picker-indicator {
    filter: invert(1);
    cursor: pointer;
    opacity: 0.7;
    transition: opacity 0.3s ease;
}
input[type="date"]::-webkit-calendar-picker-indicator:hover {
    opacity: 1;
}


input[type="date"]:focus, select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(91, 192, 190, 0.3); /* Glow effect */
}

button {
    padding: 15px;
    border: none;
    border-radius: 8px;
    background-color: var(--accent-color);
    color: var(--bg-end); /* Dark text for contrast */
    font-size: 1.1em;
    font-weight: bold;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease; /* Smooth transition for all properties */
}

button:hover {
    background-color: var(--success-color);
    box-shadow: 0 5px 15px rgba(111, 255, 210, 0.2);
    transform: translateY(-2px);
}
button:active {
    transform: scale(0.98) translateY(0);
}

#view-source-btn {
    background-color: transparent;
    border: 2px solid var(--accent-color);
    color: var(--accent-color); /* Text color matches border */
    margin-top: 20px;
}
#view-source-btn:hover {
    background-color: var(--accent-color);
    color: var(--bg-end); /* Dark text on hover */
    box-shadow: 0 5px 15px rgba(91, 192, 190, 0.2);
}


.hidden {
    display: none !important;
}

#results-section {
    margin-top: 40px;
}

#results-section h2 {
    text-align: center;
    color: var(--accent-color);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 15px;
    font-size: 1.8em;
}

.card {
    background-color: var(--primary-color);
    padding: 30px; /* More padding */
    border-radius: 12px;
    margin-top: 25px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 12px var(--shadow-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px var(--shadow-color);
}

.card h3 {
    color: var(--success-color);
    margin-top: 0;
}


#summary {
    text-align: center;
    font-size: 1.2em;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: var(--bg-start);
    padding: 20px;
}

#summary strong {
    color: white;
    font-size: 1.5em;
    display: block;
}

#numerology-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    max-width: 300px;
    margin: 20px auto;
}

.grid-cell {
    aspect-ratio: 1 / 1;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.8em;
    font-weight: bold;
    border-radius: 8px;
    background-color: var(--card-color);
    border: 1px solid var(--border-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.grid-cell.count-1 { background-color: #4a7c8c; }
.grid-cell.count-2 { background-color: var(--accent-color); color: var(--bg-end); }
.grid-cell.count-3 { background-color: #6ac7c5; color: var(--bg-end); }
.grid-cell.count-4 { background-color: #8ce3e1; color: var(--bg-end); }
.grid-cell.count-5-plus { background-color: var(--success-color); color: var(--bg-end); }


#missing-numbers-summary {
    text-align: center;
    margin-top: 20px;
    font-size: 1.1em;
}

#missing-details .missing-item,
#connections-details .connection-item {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

#missing-details .missing-item:first-child,
#connections-details .connection-item:first-child {
    border-top: none;
    margin-top: 0;
    padding-top: 0;
}

#missing-details strong,
#connections-details strong {
    color: var(--accent-color);
}

/* --- 連線區塊的樣式 --- */
.connection-group-title {
    color: var(--text-muted-color);
    font-size: 1em;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 25px;
    margin-bottom: 0;
    padding-bottom: 10px;
    border-bottom: 1px dashed var(--border-color);
}
.connection-group-title:first-of-type {
    margin-top: 0;
}
.connection-item {
    padding-top: 15px;
    margin-top: 0;
    border-top: none; 
}
.connection-item p {
    margin-top: 5px;
    margin-bottom: 0;
}

/* --- 修正：漸層分隔線樣式 --- */
hr.connection-divider {
    border: 0;
    height: 1px;
    background-image: linear-gradient(to right, rgba(0, 0, 0, 0), var(--accent-color), rgba(0, 0, 0, 0));
    margin: 30px 0; /* 控制分隔線上下的間距 */
}

/* --- 修正：如果 h4 前面是分隔線，就取消 h4 的上邊距 --- */
hr.connection-divider + .connection-group-title {
    margin-top: 0;
}


footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted-color);
}

footer a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease;
}

footer a:hover {
    color: var(--success-color);
}

/* Modal Styles */
.modal {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: var(--bg-end);
    padding: 30px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    width: 90%;
    max-width: 700px;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 8px 32px 0 var(--shadow-color);
}

.close-btn {
    position: absolute;
    top: 15px;
    right: 20px;
    color: var(--text-muted-color);
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s ease, transform 0.3s ease;
}
.close-btn:hover {
    color: var(--accent-color);
    transform: rotate(90deg);
}

/* Responsive Design for Mobile */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    .container {
        padding: 15px;
        backdrop-filter: none; /* Can be slow on mobile */
    }
    .card {
        padding: 20px;
    }
    header h1 {
        font-size: 2em;
    }
    header p {
        font-size: 1em;
    }
    button {
        padding: 12px;
    }
}


/* --- 美化彈出視窗內容的樣式 --- */
#source-data-content h2 {
    color: var(--accent-color);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 10px;
    margin-bottom: 20px;
    font-size: 1.5em;
    text-align: center;
}

#source-data-content h3 {
    color: var(--success-color);
    margin-top: 25px;
    margin-bottom: 10px;
    font-size: 1.2em;
    border-left: 4px solid var(--success-color);
    padding-left: 10px;
}

#source-data-content p {
    margin-bottom: 15px;
    line-height: 1.8;
    color: var(--text-muted-color);
    padding-left: 14px; /* 與 h3 對齊 */
}

#source-data-content hr {
    border: 0;
    height: 1px;
    background-image: linear-gradient(to right, rgba(0, 0, 0, 0), var(--border-color), rgba(0, 0, 0, 0));
    margin: 30px 0;
}

#source-data-content .zodiac-list {
    list-style-type: none;
    padding-left: 14px;
    color: var(--text-muted-color);
}