:root {
    --primary-color: #e7993c;
    --primary-dark: #cc7a1e;
    --bg-color: #fdf6e3;
    --text-color: #333;
    --header-text: #fff;
    --card-bg: #fff;
}

body {
    margin: 0;
    font-family: "Zen Kurenaido", sans-serif;
    background-color: #2c3e50; /* Darker background for workspace feel */
    color: var(--text-color);
    user-select: none;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100dvh;
}

#app-container {
    width: 100%;
    height: 100dvh;
    min-height: 100dvh; /* Allow expanding to full device width */
    background-color: var(--bg-color);
    position: relative;
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
    overflow: hidden; /* Hide overflow outside container */
    display: flex;
    flex-direction: column;
}

header {
    flex-shrink: 0; /* Header doesn't shrink */
    background-color: var(--primary-color);
    color: var(--header-text);
    padding: 70px 15px 20px 15px; /* Increased Top padding for generous Safe Area */
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    z-index: 100;
    position: relative; /* Context for absolute title */
}

/* ... existing code ... */

h1, h2 {
    margin: 0;
    font-size: 1.2rem;
    text-align: center;
}

#page-title {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: max-content; /* Ensure width fits content */
    max-width: 60%; /* Prevent overlap with buttons */
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.icon-button {
    background: none;
    border: none;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
}

/* Screen Management */
.screen {
    display: none;
    padding: 20px 20px 80px 20px; /* 80px bottom padding for AdMob banner */
    animation: fadeIn 0.3s ease;
}

.screen.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Menu Grid */
.menu-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    max-width: 500px;
    margin: 40px auto;
}

.menu-card {
    background-color: var(--card-bg);
    border: 2px solid var(--primary-color);
    border-radius: 15px;
    padding: 30px;
    font-size: 1.5rem;
    color: var(--primary-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.menu-card:active {
    background-color: var(--primary-color);
    color: white;
    transform: scale(0.98);
}

.menu-card i {
    font-size: 2.5rem;
}

/* Unit List */
.unit-item {
    background: white;
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 15px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.unit-header {
    display: flex;
    align-items: center;
    gap: 10px;
}

.unit-title {
    font-weight: bold;
    flex-grow: 1;
    font-size: 1.4rem; /* Larger font size */
}

.unit-count {
    font-size: 1.0rem;
    color: #666;
    margin-left: 10px;
    font-weight: normal;
}

.unit-controls {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

.unit-btn {
    padding: 8px 16px;
    border: none;
    border-radius: 20px;
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
    font-weight: bold;
}

.btn-video {
    background-color: #ff9800;
    color: white;
}

.btn-quiz {
    background-color: #2196F3;
    color: white;
}

.btn-material {
    background-color: #4CAF50;
    color: white;
}



/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-color: rgba(0,0,0,0.8);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: black;
    padding: 5px;
    width: 90%;
    max-width: 800px;
    position: relative;
    border-radius: 5px;
}

.close-modal {
    position: absolute;
    top: -40px;
    right: 0;
    color: white;
    font-size: 30px;
    cursor: pointer;
}

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 */
    height: 0;
    background: #000;
}

.video-wrapper iframe, .video-wrapper video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
}

main {
    flex-grow: 1;
    overflow-y: auto; /* Allow scrolling within main content */
    position: relative;
    min-height: 0; /* Important for flex scrolling */
}

/* Full Screen Quiz Styles */
/* Full Screen Quiz Styles */
#quiz-screen {
    background-color: #f0fdf4; /* Very light mint/green tint like the english app */
    padding: 50px 0 0 0; /* Top padding for Safe Area (Notch) */
    display: none; /* Hidden by default */
    flex-direction: column;
}

#quiz-screen.active {
    display: flex; /* Flex when active */
}

.quiz-header {
    flex-shrink: 0;
}

.quit-btn {
    background: #fff;
    border: 2px solid #ccc;
    color: #555;
    padding: 5px 15px; /* Smaller padding */
    border-radius: 20px; /* Pill shape */
    font-family: 'Zen Kurenaido', sans-serif;
    font-size: 1rem; /* Smaller font */
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.quit-btn:hover {
    background: #f5f5f5;
}

.quiz-status {
    font-size: 1.1rem;
    color: #666;
}

.quiz-main-content {
    flex-grow: 1;
    padding: 10px 0 100px 0; /* Added 100px bottom padding for AdMob banner */
    width: 90%; /* Constrain width to avoid edge touching */
    max-width: 600px;
    margin: 0 auto; /* Center perfectly */
    display: flex;
    flex-direction: column;
    justify-content: flex-start; /* Align smoothly from top */
    position: relative; /* Context for relative positioning of children if needed, though strictly absolute bg needs container relative */
    z-index: 1; /* Ensure content is above bg */
}

#quiz-question-wrapper {
    position: relative;
    width: 100%;
    display: flex;
    flex-direction: column; /* Stack question and feedback vertically */
    justify-content: center;
    align-items: center;
    min-height: 120px; /* Compact by default */
    transition: min-height 0.3s ease;
}

#quiz-question-wrapper.wrapper-large-bg {
    min-height: 250px; /* Expand only when bg image is present */
}

#quiz-question-wrapper.wrapper-pop-bg {
    min-height: 320px; /* Provide enough vertical space so square maps aren't cropped */
}

#quiz-bg-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    opacity: 0.5; /* Increased for visibility testing */
    z-index: 1; /* Behind text (z-index 2) but inside relative container */
    pointer-events: none;
    transition: background-image 0.3s ease;
}

#quiz-question {
    font-size: 1.5rem !important; /* Smaller question text */
    margin: 10px 0 !important;
    word-break: break-word; /* Better wrapping */
    overflow-wrap: break-word;
    white-space: normal;
}

.quiz-options-grid {
    display: flex;
    flex-direction: column;
    gap: 12px; /* Smaller gap */
    width: 100%;
    margin-top: 20px; /* Smaller margin */
}

.quiz-option-btn {
    background: #fff;
    border: 2px solid #ddd;
    border-radius: 12px;
    padding: 15px; /* Smaller padding */
    font-size: 1.1rem; /* Smaller font for options */
    color: #333;
    font-family: 'Zen Kurenaido', sans-serif;
    cursor: pointer;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    transition: transform 0.1s, background 0.2s;
}

.quiz-option-btn:hover {
    background: #fafafa;
    transform: translateY(-2px);
    border-color: #aaa;
}

.quiz-option-btn:active {
    transform: translateY(0);
}

#feedback-comment {
    background: white;
    padding: 15px;
    border-radius: 10px;
    border: 1px dotted #ccc;
    margin-top: 10px;
}

#quiz-result {
    width: 90%;
    max-width: 600px;
    margin: 30px auto; /* Center horizontally with top margin */
    text-align: center;
    padding-bottom: 30px;
}

/* --- Information Ticker --- */
.ticker-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 95%;
    max-width: 600px; /* Increased to fit chars */
    margin: 10px auto 0 auto;
    gap: 5px;
}

.ticker-char {
    width: 50px; /* Small size as requested */
    height: auto;
    object-fit: contain;
}

.info-ticker-container {
    flex-grow: 1;
    background-color: #333;
    color: #0f0; /* Green LED style */
    overflow: hidden;
    white-space: nowrap;
    /* width handled by flex */
    margin: 0; /* Margin handled by wrapper */
    padding: 8px 0;
    border-radius: 4px;
    box-shadow: inset 0 0 5px rgba(0,0,0,0.5);
    border: 2px solid #555;
    font-family: 'Courier New', Courier, monospace; /* Monospace for retro feel */
    font-weight: bold;
    font-size: 1.1rem; /* Slightly larger as requested */
}

.info-ticker-content {
    display: inline-block;
    white-space: nowrap;
    /* Move by -25% because we have 4 copies. */
    /* Duration is set by JS for constant speed, fallback to 10s */
    animation: ticker 10s linear infinite; 
}

.info-ticker-content span {
    display: inline-block;
    padding-right: 50px; /* Gap between messages */
    white-space: nowrap; /* Prevent wrapping inside span */
}

@keyframes ticker {
    0% { transform: translateX(0); }
    100% { transform: translateX(-25%); }
}

/* --- Bottom Navigation --- */
.app-footer {
    display: flex;
    justify-content: space-around;
    align-items: center;
    background-color: #fff;
    padding: 10px 0; /* Safe area handled by padding-bottom if needed */
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
    border-top: 1px solid #eee;
    flex-shrink: 0; /* Prevent shrinking */
    z-index: 90;
    position: relative;
    padding-bottom: 80px !important; /* Adjust for AdMob banner */
}

/* Hide footer when quiz is active (handled by JS toggling class on body or footer) */
.app-footer.hidden {
    display: none;
}

.nav-icon-btn {
    background: none;
    border: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 8px 20px;
    cursor: pointer;
    color: #666;
    transition: color 0.2s;
}

.nav-icon-btn:active {
    color: var(--primary-color);
}

.nav-icon {
    font-size: 1.5rem;
    margin-bottom: 2px;
}

.nav-label {
    font-size: 0.7rem;
    font-weight: bold;
}

.user-nav-container {
    position: relative;
}

.user-avatar-placeholder {
    font-size: 1.2rem;
    background: #eee;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #888;
}

/* User Menu Popup */
.user-menu {
    position: absolute;
    bottom: 120%;
    left: 50%;
    transform: translateX(-50%);
    background: white;
    border: 1px solid #ddd;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    width: 180px;
    z-index: 100;
    padding: 0.8rem;
    display: none; /* Hidden by default via class */
}

.user-menu.active {
    display: block;
}

.user-menu ul {
    list-style: none;
    padding: 0;
    margin: 0 0 0.5rem 0;
    max-height: 150px;
    overflow-y: auto;
}

.user-menu li {
    padding: 0.8rem;
    border-bottom: 1px solid #f0f0f0;
    cursor: pointer;
    color: var(--primary-dark) !important;
}

.user-menu li:hover {
    background-color: #f9f9f9;
}

.user-menu li.current {
    font-weight: bold;
    color: var(--primary-color);
}

.add-user-btn {
    width: 100%;
    padding: 0.8rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
}

/* --- Calendar Modal Styles --- */
.calendar-modal-content, .stats-modal-content {
    background: white;
    padding: 20px;
    width: 90%;
    max-width: 400px;
    border-radius: 15px;
    position: relative;
    max-height: 80vh;
    overflow-y: auto;
}

.close-modal-btn {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 2rem;
    cursor: pointer;
    color: #999;
    line-height: 1;
}

.calendar-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.icon-text-btn {
    background: none;
    border: 1px solid #ddd;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #555;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
    background: #eee;
    border: 1px solid #eee;
    border-radius: 4px;
    overflow: hidden;
}

.calendar-cell {
    background: white;
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    position: relative;
    color: #333;
}

.calendar-header {
    font-weight: bold;
    background: #fdf6e3; /* Match App BG */
    aspect-ratio: auto;
    padding: 5px 0;
    color: var(--primary-dark);
}

.calendar-count {
    font-size: 0.7rem;
    background: var(--primary-color);
    color: white;
    padding: 1px 4px;
    border-radius: 4px;
    margin-top: 2px;
}

.calendar-today {
    border: 2px solid var(--primary-dark);
}

.calendar-legend {
    font-size: 0.8rem;
    text-align: right;
    color: #888;
    margin-top: 0.5rem;
}

/* Stats Styles */
.stats-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.stats-card {
    border: 1px solid #eee;
    padding: 10px;
    border-radius: 8px;
    background: #fafafa;
}

.stats-title {
    font-weight: bold;
    margin-bottom: 5px;
    color: var(--primary-dark);
}

.stats-bar-bg {
    height: 8px;
    background: #eee;
    border-radius: 4px;
    overflow: hidden;
}

.stats-bar-fill {
    height: 100%;
    background: var(--primary-color);
    width: 0%;
    transition: width 0.5s ease;
}

/* Hidden Utility */
.hidden {
    display: none !important;
}

/* --- New Stats Tab Styles --- */
.stats-modal-wrap {
    width: 100%; /* updated */
    max-width: 100%;
    margin: 0;
    height: 100%;
    display: flex;
    flex-direction: column;
    padding-top: 80px; /* Increased Safe area */
}
.stats-tabs {
    display: flex;
    width: 100%;
    margin-top: 90px; /* Push the tabs down to avoid the camera notch */
}
.stats-tab {
    flex: 1;
    padding: 15px 5px;
    text-align: center;
    border: 2px solid #555;
    border-bottom: none;
    border-radius: 15px 15px 0 0; /* updated */
    font-weight: bold;
    font-size: 1.2rem;
    cursor: pointer;
    background-color: #ccc;
    color: white;
    margin-right: -2px;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
    transition: all 0.2s;
}
.stats-tab:last-child {
    margin-right: 0;
}
.stats-tab.tab-geo { background-color: #a7e4ee; color: #fff; }
.stats-tab.tab-hist { background-color: #f1b6b6; color: #fff; }
.stats-tab.tab-civ { background-color: #dca3f2; color: #fff; }

.stats-tab.active {
    z-index: 2;
    position: relative;
    padding-bottom: 12px;
}
.stats-tab.tab-geo.active { background-color: #8cdce8; }
.stats-tab.tab-hist.active { background-color: #e89898; }
.stats-tab.tab-civ.active { background-color: #cb81e8; }

.stats-content-wrapper {
    border: none;
    border-radius: 0; /* updated */
    padding: 50px 15px 15px 15px; /* Added top padding for ~3 lines of blank space */
    z-index: 1;
    position: relative;
    flex: 1;
    overflow-y: auto;
    background-color: #fff;
}
.stats-content-wrapper.bg-geo { background-color: #8cdce8; }
.stats-content-wrapper.bg-hist { background-color: #e89898; }
.stats-content-wrapper.bg-civ { background-color: #cb81e8; }

/* Styles for stats items inside tabs */
.stats-chapter-block {
    margin-bottom: 20px;
    text-align: left;
    color: white;
    font-weight: bold;
}
.stats-chapter-title {
    font-size: 1.2rem;
    margin-bottom: 5px;
}
.stats-unit-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.95rem;
    margin-bottom: 5px;
}
.stats-unit-name {
    flex: 2;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.stats-unit-progress-container {
    flex: 1;
    height: 12px;
    background: #444;
    border: 1px solid #333;
    position: relative;
    margin: 0 10px;
}
.stats-unit-progress-bar {
    height: 100%;
    background: #3b5998; /* Dark blue progress bar from image */
}
.stats-unit-percent {
    flex: 0 0 35px;
    text-align: right;
}

.stats-tab.tab-back { background-color: #95a5a6; color: #fff; }
.stats-tab.tab-back:active { background-color: #7f8c8d; }


/* Ticker character styles */
.ticker-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 10px auto 20px auto;
    position: relative;
    z-index: 10;
}
.ticker-char {
    height: 50px;
    width: auto;
    object-fit: contain;
}
.left-char {
    margin-right: 15px;
}
.right-char {
    margin-left: 15px;
}
.info-ticker-container {
    background: #34495e;
    color: white;
    padding: 10px 20px;
    border-radius: 20px;
    font-weight: bold;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    display: inline-block;
}