/* === 1. Global Variables & Resets === */
:root {
    /* Dark Theme (Default) */
    --primary-color: #ff4040;
    --primary-color-hover: #e53935;
    --primary-color-light: #ff8080;
    --primary-text-color: #ffffff;

    --secondary-color: #555555;
    --secondary-color-hover: #666666;

    --success-color: #66bb6a;
    --success-color-hover: #4caf50;
    --warning-color: #ffc107;
    --warning-color-hover: #ffa000;
    --danger-color: #e53e3e;
    --danger-color-hover: #c82333;
    
    --bg-color: #1c1c1c;
    --container-bg-color: #2a2a2a;
    --secondary-bg-color: #303030;
    --tertiary-bg-color: #3a3a3a;
    --top-bar-bg-color: rgba(42, 42, 42, 0.9);
    
    --text-color: #e0e0e0;
    --text-color-light: #aaa;
    --link-color: #ffc107;
    
    --border-color: #555555;
    --border-radius-sm: 8px;
    --border-radius-md: 15px;
    --border-radius-lg: 25px;

    --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    --box-shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.3);
    --primary-shadow: 0 4px 15px rgba(255, 64, 64, 0.3);
}

/* Light Theme Overrides */
body.light-theme {
    --primary-color: #ff4040;
    --primary-color-hover: #e53935;
    --primary-color-light: #ff8080;

    --secondary-color: #8E9297;
    --secondary-color-hover: #9fa3a8;
    
    --bg-color: #54575C;
    --container-bg-color: #5D6269;
    --secondary-bg-color: #686D76;
    --tertiary-bg-color: #8E9297;
    --top-bar-bg-color: rgba(74, 77, 83, 0.9);
    
    --text-color: #f0f1f2;
    --text-color-light: #a0a0a0;
    
    --border-color: #72767D;
    
    --box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: var(--bg-color);
    min-height: 100vh;
    padding: 80px 20px 20px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* === 2. Typography === */
h1 {
    color: var(--primary-color);
    border-bottom: 2px solid var(--border-color);
    text-align: center;
    margin-bottom: 20px;
    font-size: 2rem;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3);
    word-break: break-word;
}

h2 {
    color: var(--primary-color);
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 20px;
    font-size: 1.9rem;
    padding-bottom: 10px;
    text-align: center;
    word-break: break-word;
}

/* === 3. Layout Containers === */
.top-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: center; /* Centrujemy zawartość */
    align-items: center;
    padding: 10px 20px;
    background: var(--top-bar-bg-color);
    backdrop-filter: blur(5px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    z-index: 1002;
    /* Dodajemy wysokość, aby zapobiec "skakaniu" layoutu */
    height: 64px; 
}

.top-bar-icon-group {
    display: flex;
    align-items: center;
    gap: 10px; /* Odstępy między ikonami */
    transition: opacity 0.3s ease; /* Usuwamy transition dla pointer-events */
    position: absolute; /* Ustawiamy pozycję absolutną dla obu elementów */
}

/* Usuwamy ten kontener, bo nie jest już potrzebny */
/* .top-bar-content-center { ... } */

.container,
.auth-container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--container-bg-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--box-shadow);
    padding: 30px;
}

.auth-container {
    text-align: center;
    width: 100%;
}

/* === 4. Shared Components === */

/* --- Base Button Style --- */
.btn {
    color: var(--primary-text-color);
    border: none;
    border-radius: var(--border-radius-lg);
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    padding: 12px 25px;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-hover);
}

.btn:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

/* --- Button Color Modifiers --- */
.btn-primary {
    background: var(--primary-color);
    box-shadow: var(--primary-shadow);
}
.btn-primary:hover:not(:disabled) {
    background: var(--primary-color-hover);
}
.btn-primary.active, .option-btn.active {
    background-color: var(--primary-color-hover);
    box-shadow: var(--primary-shadow);
    transform: translateY(-2px);
}
.btn-secondary {
    background: var(--secondary-color);
}
.btn-secondary:hover:not(:disabled) {
    background: var(--secondary-color-hover);
}

/* --- Top Bar Buttons & User Display --- */
.top-bar-btn {
    background: var(--secondary-bg-color);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    padding: 10px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.3s ease;
}
.top-bar-btn:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
}
.top-bar-btn .icon {
    width: 24px;
    height: 24px;
}
.user-display-name {
    padding: 8px 20px;
    background-color: var(--secondary-bg-color);
    color: var(--link-color);
    font-weight: bold;
    border-radius: var(--border-radius-lg);
    text-align: center;
    max-width: 40vw;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    cursor: pointer;
    transition: opacity 0.3s ease, transform 0.2s ease, background-color 0.2s ease;
    opacity: 0;
    pointer-events: none;
    position: absolute; /* Ustawiamy pozycję absolutną dla obu elementów */
}

.user-display-name:hover {
    background: var(--secondary-color);
    transform: scale(1.05);
}

/* Logout button - visible when scrolled */
.logout-btn {
    position: absolute;
    right: 20px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.logout-btn.visible {
    opacity: 1;
    pointer-events: auto;
}

/* --- Auth Form Inputs --- */
.auth-input {
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 12px 15px;
    font-size: 1rem;
    color: var(--text-color);
    width: 90%;
    max-width: 300px;
    margin: 20px;
    transition: all 0.3s ease;
}
.auth-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 64, 64, 0.2);
}

/* --- Action Bar / Button Group Container --- */
.action-bar {
    text-align: center;
    margin-bottom: 20px;
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
}

/* --- Content Selector (dla quizów i fiszek) --- */
.content-selector-box {
    text-align: center;
    margin-bottom: 20px;
    padding: 15px;
    background: var(--secondary-bg-color);
    border-radius: 10px;
}
.content-selector-box label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
}
.content-selector-box select {
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 10px 15px;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.3s ease;
    width: 90%;
    max-width: 350px;
}
.content-selector-box select:hover {
    border-color: var(--primary-color);
}

/* --- Learning Item (dla pytania w quizie lub widoku fiszki) --- */
.learning-item {
    background: var(--secondary-bg-color);
    border-radius: 10px;
    padding: 25px;
    margin-bottom: 25px;
    border-left: 5px solid var(--primary-color);
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
    position: relative;
}
.learning-item:hover {
    transform: translateY(-2px);
    background: var(--tertiary-bg-color);
}
.learning-item-header {
    font-weight: bold;
    color: var(--primary-color-light);
    margin-bottom: 10px;
}
.learning-item-content {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 20px;
    word-break: break-all;
}

/* --- Learning Options (dla odpowiedzi w quizie i fiszkach) --- */
.options-container {
    display: grid;
    gap: 8px;
}
.learning-option {
    background: var(--secondary-bg-color);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 12px;
    transition: all 0.3s ease;
    cursor: pointer;
    word-break: break-all;
    display: flex;
    align-items: center;
    text-align: left;
}
.learning-option:hover:not(.correct):not(.incorrect):not([disabled]) {
    transform: scale(1.01);
    border-color: var(--primary-color);
    background: var(--tertiary-bg-color);
}
.learning-option-letter {
    font-weight: bold;
    margin-right: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--primary-color);
    color: var(--primary-text-color);
    border-radius: 50%;
    font-size: 0.8rem;
    flex-shrink: 0;
}

/* --- Option State Styles (correct/incorrect) --- */
.learning-option.selected {
    background: #606060; /* Specific color, can be variablized if needed */
    border-color: var(--primary-color);
    border-width: 3px;
    padding: 11px;
}
body.light-theme .learning-option.selected {
    background: #e9ecef;
}
.learning-option.correct {
    background: linear-gradient(45deg, #48bb78, #38a169);
    border-color: #38a169;
    color: white;
    font-weight: 600;
}
body.light-theme .learning-option.correct {
    background: #3ba55d;
    border-color: #3ba55d;
}
.learning-option.incorrect {
    background: #442222;
    border-color: var(--danger-color);
    color: #ffaaaa;
}
body.light-theme .learning-option.incorrect {
    background: #5c2e30;
    border-color: #ed4245;
    color: #f0b9bb;
}
.learning-option[disabled] {
    cursor: not-allowed;
    opacity: 0.7;
}
.learning-option.correct .learning-option-letter {
    background: #38a169;
}
body.light-theme .learning-option.correct .learning-option-letter {
    background: #3ba55d;
}
.learning-option.incorrect .learning-option-letter {
    background: var(--danger-color);
}
.learning-item.correct-answer {
    border-left-color: var(--success-color-hover);
}
.learning-item.incorrect-answer {
    border-left-color: var(--danger-color);
}


/* --- Status & Loading Indicators --- */
.status-message,
.error-message {
    margin-top: 20px;
    padding: 15px;
    border-radius: var(--border-radius-sm);
    text-align: center;
    color: var(--primary-text-color);
}
.status-message {
    background: var(--success-color-hover);
}
.error-message {
    background: var(--danger-color);
}
.loading {
    text-align: center;
}
.loading-dots span {
    display: inline-block;
    width: 10px;
    height: 10px;
    background-color: var(--primary-color-light);
    border-radius: 50%;
    margin: 0 3px;
    animation: bounce 1.4s infinite ease-in-out both;
}
.loading-dots .dot:nth-child(2) {
    animation-delay: -0.16s;
}
.loading-dots .dot:nth-child(3) {
    animation-delay: -0.32s;
}
@keyframes bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1.0); }
}

/* === 5. Light Theme (Legacy - now handled by :root overrides) === */
/* Most light theme styles are now handled by overriding :root variables. */
/* Only keep specific overrides that cannot be handled by variables. */
body.light-theme .btn:disabled {
    background-color: var(--secondary-bg-color);
    color: var(--text-color-light);
}