/* Google Fonts: Sarabun for Thai, Inter for English & numerals */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;700&family=Sarabun:wght@400;500;600;700&display=swap');

/* Style Tokens & Reset */
:root {
    --bg-cream: #F8F6F0;
    --card-white: #FFFFFF;
    --text-dark: #113C22;
    --text-muted: #3D5A46;
    --primary-green: #1E5335;
    --accent-green: #2B7A4E;
    --divider-sand: #D8D2BE;
    --shadow-soft: 0 4px 12px rgba(17, 60, 34, 0.06);
    --shadow-medium: 0 8px 24px rgba(17, 60, 34, 0.12);
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 20px;
    --transition-fast: all 0.2s ease;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Sarabun', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-cream);
    color: var(--text-dark);
    font-size: 18px; /* Senior friendly base size */
    line-height: 1.7;
    padding: 0 0 4rem 0; /* extra space at bottom for floating button */
    -webkit-font-smoothing: antialiased;
}

/* Container */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 1.5rem;
}

/* Header & Title Area */
.site-header {
    position: relative; /* Non-sticky as requested */
    text-align: center;
    padding: 2rem 1.5rem 1rem 1.5rem;
}

.site-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-green);
    margin-bottom: 0.5rem;
    letter-spacing: -0.5px;
}

.site-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 1.5rem;
}

/* Language Selection for Cover */
.cover-lang-selector {
    display: inline-flex;
    background-color: rgba(30, 83, 53, 0.08);
    padding: 4px;
    border-radius: var(--border-radius-sm);
    margin-bottom: 1.5rem;
}

.cover-lang-btn {
    border: none;
    background: transparent;
    padding: 6px 16px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--primary-green);
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.cover-lang-btn.active {
    background-color: var(--primary-green);
    color: var(--bg-cream);
}

/* Direct Navigation Buttons (6 Grid Buttons) */
.nav-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr); /* Default 3 columns for desktop/tablet */
    gap: 10px;
    margin-bottom: 2rem;
}

.nav-btn {
    background-color: var(--card-white);
    border: 2px solid var(--divider-sand);
    border-radius: var(--border-radius-md);
    padding: 14px 10px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-soft);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 80px; /* Large tap targets */
}

.nav-btn:hover {
    transform: translateY(-2px);
    border-color: var(--accent-green);
    box-shadow: var(--shadow-medium);
}

.nav-btn.active {
    background-color: var(--primary-green);
    border-color: var(--primary-green);
    color: var(--bg-cream);
}

.nav-btn.active .nav-btn-sub {
    color: rgba(248, 246, 240, 0.8);
}

.nav-btn-main {
    font-size: 1.1rem;
    font-weight: 700;
}

.nav-btn-sub {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 4px;
    font-weight: 500;
}

/* Floating Navigation Back to Main/Home */
.home-nav-btn {
    grid-column: 1 / -1; /* spans all columns */
    background-color: var(--primary-green);
    border-color: var(--primary-green);
    color: var(--bg-cream);
    font-size: 1.15rem;
    font-weight: 700;
    min-height: 60px;
}

.home-nav-btn:hover {
    background-color: var(--accent-green);
    border-color: var(--accent-green);
}

/* Section Card Layouts */
.content-card {
    background-color: var(--card-white);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-soft);
    margin-bottom: 2rem;
    border: 1px solid rgba(216, 210, 190, 0.5);
}

.content-section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-green);
    margin-bottom: 1.25rem;
    border-left: 5px solid var(--accent-green);
    padding-left: 12px;
}

/* Sub-tabs for Outline view languages */
.outline-tab-bar {
    display: flex;
    border-bottom: 2px solid var(--divider-sand);
    margin-bottom: 1.5rem;
}

.outline-tab {
    flex: 1;
    text-align: center;
    border: none;
    background: transparent;
    padding: 12px 6px;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    transition: var(--transition-fast);
}

.outline-tab.active {
    color: var(--primary-green);
    border-bottom-color: var(--primary-green);
    font-weight: 700;
}

/* Timetable and Info Tables */
.table-wrapper {
    overflow-x: auto; /* scrollable on small screens */
    margin-bottom: 2rem;
    border-radius: var(--border-radius-md);
    border: 1px solid var(--divider-sand);
    box-shadow: var(--shadow-soft);
}

.custom-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 1rem;
    text-align: left;
}

.custom-table th {
    background-color: var(--primary-green);
    color: var(--bg-cream);
    padding: 14px 16px;
    font-weight: 700;
    border-bottom: 2px solid var(--primary-green);
}

.custom-table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--divider-sand);
    background-color: var(--card-white);
}

.custom-table tr:last-child td {
    border-bottom: none;
}

.custom-table tr:nth-child(even) td {
    background-color: rgba(30, 83, 53, 0.02); /* very soft green alternation */
}

/* Outlines Line Typesetting (Very Premium Indent layout) */
.outline-container {
    margin-top: 1rem;
}

.outline-line {
    display: flex;
    margin-bottom: 0.75rem;
    align-items: flex-start;
}

.outline-prefix {
    flex-shrink: 0;
    font-weight: normal;
    color: var(--text-muted);
}

.outline-text {
    flex-grow: 1;
    word-break: break-word;
}

/* Levels of indents (using left padding or margins based on XML level) */
.level-0 {
    padding-left: 0;
    margin-top: 1.5rem;
    margin-bottom: 1rem;
}
.level-0 .outline-prefix {
    width: 2.2rem;
}
.level-0 .outline-text, .level-0 .outline-prefix {
    font-weight: 700; /* Bold ONLY on Level 0 */
    font-size: 1.15rem;
    color: var(--primary-green);
}

.level-1 {
    padding-left: 1.5rem;
}
.level-1 .outline-prefix {
    width: 2.2rem;
}

.level-2 {
    padding-left: 3rem;
}
.level-2 .outline-prefix {
    width: 2.2rem;
}

.level-3 {
    padding-left: 4.5rem;
}
.level-3 .outline-prefix {
    width: 2.2rem;
}

.level-4 {
    padding-left: 6rem;
}
.level-4 .outline-prefix {
    width: 2.2rem;
}

.level-5 {
    padding-left: 7.5rem;
}
.level-5 .outline-prefix {
    width: 2.2rem;
}

/* Banners (Key Statements) block style */
.banner-card {
    background-color: rgba(30, 83, 53, 0.04);
    border-left: 6px solid var(--primary-green);
    border-radius: var(--border-radius-sm);
    padding: 1.25rem;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-dark);
}

.banner-card-title {
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent-green);
    margin-bottom: 0.5rem;
}

/* Reminders List (in love) */
.reminder-list {
    list-style: none;
}

.reminder-item {
    position: relative;
    padding-left: 1.75rem;
    margin-bottom: 0.75rem;
}

.reminder-item::before {
    content: "♥";
    position: absolute;
    left: 0;
    top: 0;
    color: var(--accent-green);
    font-size: 1.1rem;
}

/* Contacts Card Icons */
.contact-item {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid rgba(216, 210, 190, 0.4);
}

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

.contact-name {
    font-weight: 600;
}

.contact-phone {
    font-weight: 700;
    color: var(--accent-green);
    text-decoration: none;
}

/* Quick links card inside Home */
.quick-links-card {
    display: flex;
    gap: 15px;
    margin-bottom: 2rem;
}

.quick-link-btn {
    flex: 1;
    background-color: var(--primary-green);
    color: var(--bg-cream);
    text-align: center;
    padding: 16px 10px;
    border-radius: var(--border-radius-md);
    text-decoration: none;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    cursor: pointer;
    box-shadow: var(--shadow-soft);
    border: none;
    transition: var(--transition-fast);
}

.quick-link-btn:hover {
    background-color: var(--accent-green);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

/* Floating Action Button (FAB) */
.fab-home {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    width: 3.5rem;
    height: 3.5rem;
    background-color: var(--primary-green);
    color: var(--bg-cream);
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow-medium);
    transition: var(--transition-fast);
    z-index: 1000;
}

.fab-home:hover {
    transform: scale(1.1);
    background-color: var(--accent-green);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.3s ease forwards;
}

/* Responsive Rules */
@media (max-width: 600px) {
    body {
        font-size: 17px;
    }
    
    .nav-grid {
        grid-template-columns: repeat(2, 1fr); /* 2 columns on phones (3 rows) */
    }
    
    .site-title {
        font-size: 1.65rem;
    }
    
    .content-card {
        padding: 1.25rem;
        border-radius: var(--border-radius-md);
    }
    
    .level-1 { padding-left: 0.75rem; }
    .level-2 { padding-left: 1.5rem; }
    .level-3 { padding-left: 2.25rem; }
    .level-4 { padding-left: 3rem; }
    .level-5 { padding-left: 3.75rem; }
    
    .outline-prefix {
        width: 1.8rem;
    }
    
    .custom-table th, .custom-table td {
        padding: 10px 12px;
        font-size: 0.9rem;
    }
}