:root {
    --background-color: #1a1a1a;
    --surface-color: #2a2a2a;
    --primary-text-color: #e0e0e0;
    --secondary-text-color: #a0a0a0;
    --accent-color: #3b82f6;
    --border-color: #444;
}

/* --- Global Reset & Base --- */
*, *::before, *::after {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--background-color);
    color: var(--primary-text-color);
    display: flex;       /* Body is the master Flex container */
    flex-direction: column; 
}

/* --- Main Layout Container --- */
/* This wraps the main content and sits above the footer */
.container {
    flex: 1 1 auto;      /* Grow to fill space above footer */
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px;
    min-height: 0;       /* Critical for nested flex scrolling */
    display: flex;
    flex-direction: column;
}

/* --- Alpine Component Wrapper --- */
/* This div exists in HTML between .container and the content. 
   It MUST be a flex column to pass height down. */
.container > div[x-data] {
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 0;
}

/* --- Header & Search (Fixed Height) --- */
h1 {
    font-weight: 600;
    margin: 0 0 15px 0;
    flex: 0 0 auto; /* Do not grow or shrink */
}

.search-container {
    display: flex;
    margin-bottom: 20px;
    flex: 0 0 auto; /* Do not grow or shrink */
}

.search-container input[type="text"] {
    flex-grow: 1;
    padding: 12px 15px;
    font-size: 16px;
    background-color: var(--surface-color);
    color: var(--primary-text-color);
    border: 1px solid var(--border-color);
    border-radius: 6px 0 0 6px;
    outline: none;
    transition: border-color 0.2s;
}

.search-container input[type="text"]:focus {
    border-color: var(--accent-color);
}

.search-container button {
    padding: 12px 20px;
    font-size: 16px;
    font-weight: 500;
    background-color: var(--accent-color);
    color: white;
    border: none;
    cursor: pointer;
    border-radius: 0 6px 6px 0;
    transition: background-color 0.2s;
}

.search-container button:hover {
    background-color: #2563eb;
}

/* --- Content Area (Scrollable) --- */
/* Wraps Tags and List side-by-side */
.content-wrapper {
    flex: 1 1 auto;      /* Grow to fill remaining vertical space */
    display: flex;       /* Row layout */
    gap: 20px;
    min-height: 0;       /* Critical: allows children to overflow */
    overflow: hidden;    /* Contain children */
}

/* Left Sidebar: Tags */
.tag-filters {
    flex: 0 0 250px;     /* Fixed width */
    background-color: var(--surface-color);
    padding: 10px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    overflow-y: auto;    /* Independent Scroll */
    display: flex;
    flex-direction: column;
}

.tag-filters h3 {
    margin: 0 0 10px 0;
    font-size: 1em;
    font-weight: 500;
    flex-shrink: 0;
}

.tags-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

/* Right Main: Hymn List */
.hymn-list {
    flex: 1 1 auto;      /* Take remaining width */
    background-color: var(--surface-color);
    border-radius: 6px;
    border: 1px solid var(--border-color);
    overflow-y: auto;    /* Independent Scroll */
}

/* --- List Items --- */
.hymn-item {
    padding: 15px 20px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background-color 0.2s;
}

.hymn-item:last-child {
    border-bottom: none;
}

.hymn-item:hover {
    background-color: #333333;
}

.hymn-item strong {
    font-size: 1.1em;
    font-weight: 500;
    color: var(--primary-text-color);
}

.hymn-item p {
    margin: 5px 0 0 0;
    font-size: 0.9em;
    color: var(--secondary-text-color);
}

/* --- Tag UI Elements --- */
.tag-checkbox {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
    background-color: var(--background-color);
    padding: 4px 8px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.2s;
    font-size: 0.85em;
}

.tag-checkbox input {
    margin-right: 6px;
    display: none;
}

.tag-checkbox.active {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.tag-display {
    display: inline-block;
    background-color: #3b82f6;
    color: white;
    font-size: 0.75em;
    padding: 2px 8px;
    border-radius: 12px;
    margin-left: 8px;
    vertical-align: middle;
}

/* --- Footer (Fixed) --- */
.manager-login {
    flex: 0 0 auto;      /* Do not shrink */
    background-color: var(--surface-color);
    padding: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-top: 1px solid var(--border-color);
    z-index: 100;
}

#manager-password {
    padding: 4px 8px;
    font-size: 13px;
    background-color: var(--background-color);
    color: var(--primary-text-color);
    border: 1px solid var(--border-color);
    border-radius: 4px 0 0 4px;
    outline: none;
    transition: border-color 0.2s;
}

#manager-login-button {
    padding: 4px 12px;
    font-size: 13px;
    font-weight: 500;
    background-color: var(--accent-color);
    color: white;
    border: none;
    cursor: pointer;
    border-radius: 0 4px 4px 0;
    transition: background-color 0.2s;
}

/* --- Mobile Responsiveness --- */
@media (max-width: 768px) {
    .content-wrapper {
        flex-direction: column;
    }
    .tag-filters {
        flex: 0 0 150px; /* Fixed height on mobile */
        width: 100%;
        margin-bottom: 10px;
    }
    .hymn-list {
        flex: 1 1 auto;
    }
}