/* assets/css/style.css */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root {
    /* Default Purple Dark Theme */
    --font-heading: 'Space Grotesk', sans-serif;
    --font-body: 'Outfit', sans-serif;

    --bg-app: #09080f;
    --bg-sidebar: rgba(15, 12, 28, 0.7);
    --bg-card: rgba(25, 20, 45, 0.45);
    --bg-input: rgba(30, 25, 55, 0.6);
    
    --text-primary: #f1ecff;
    --text-secondary: #a59ebd;
    --text-muted: #6e6785;
    
    --accent: #9d4edd;
    --accent-rgb: 157, 78, 221;
    --accent-hover: #b5179e;
    --accent-glow: rgba(157, 78, 221, 0.25);
    
    --success: #06d6a0;
    --warning: #ffd166;
    --danger: #ef476f;
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-active: rgba(157, 78, 221, 0.4);
    
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    --glass-blur: blur(16px);
    --border-radius-lg: 16px;
    --border-radius-md: 12px;
    --border-radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme overrides */
[data-theme="light"] {
    --bg-app: #f4f6fa;
    --bg-sidebar: rgba(255, 255, 255, 0.8);
    --bg-card: rgba(255, 255, 255, 0.7);
    --bg-input: rgba(240, 242, 247, 0.9);
    
    --text-primary: #1e1b29;
    --text-secondary: #5a556e;
    --text-muted: #8c86a3;
    
    --accent: #7209b7;
    --accent-rgb: 114, 9, 183;
    --accent-hover: #560bad;
    --accent-glow: rgba(114, 9, 183, 0.12);
    
    --border-color: rgba(0, 0, 0, 0.07);
    --border-active: rgba(114, 9, 183, 0.3);
    
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
}

/* Blue (Midnight) Color Scheme overrides */
[data-scheme="blue"] {
    --bg-app: #030a16;
    --bg-sidebar: rgba(5, 17, 37, 0.75);
    --bg-card: rgba(10, 28, 59, 0.45);
    --bg-input: rgba(12, 35, 75, 0.6);
    --accent: #00b4d8;
    --accent-rgb: 0, 180, 216;
    --accent-hover: #0077b6;
    --accent-glow: rgba(0, 180, 216, 0.25);
    --border-active: rgba(0, 180, 216, 0.4);
}
[data-theme="light"][data-scheme="blue"] {
    --bg-app: #f0f5fc;
    --bg-sidebar: rgba(255, 255, 255, 0.85);
    --bg-card: rgba(255, 255, 255, 0.75);
    --bg-input: rgba(230, 238, 250, 0.9);
    --accent: #0077b6;
    --accent-rgb: 0, 119, 182;
    --accent-hover: #03045e;
}

/* Emerald Color Scheme overrides */
[data-scheme="emerald"] {
    --bg-app: #030c08;
    --bg-sidebar: rgba(5, 20, 14, 0.75);
    --bg-card: rgba(10, 32, 22, 0.45);
    --bg-input: rgba(12, 40, 28, 0.6);
    --accent: #06d6a0;
    --accent-rgb: 6, 214, 160;
    --accent-hover: #05b386;
    --accent-glow: rgba(6, 214, 160, 0.25);
    --border-active: rgba(6, 214, 160, 0.4);
}
[data-theme="light"][data-scheme="emerald"] {
    --bg-app: #f1faf6;
    --bg-sidebar: rgba(255, 255, 255, 0.85);
    --bg-card: rgba(255, 255, 255, 0.75);
    --bg-input: rgba(225, 245, 236, 0.9);
    --accent: #05b386;
    --accent-rgb: 5, 179, 134;
    --accent-hover: #028060;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-app);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Base App Layout */
.app-container {
    display: flex;
    width: 100%;
    height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* Sidebar Styling */
.sidebar {
    width: 280px;
    background-color: var(--bg-sidebar);
    backdrop-filter: var(--glass-blur);
    border-right: 1px solid var(--border-color);
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    z-index: 10;
    transition: var(--transition);
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 3rem;
}

.logo-icon {
    font-size: 2rem;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(to right, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex-grow: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.85rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--border-radius-md);
    font-weight: 500;
    transition: var(--transition);
    cursor: pointer;
    border: 1px solid transparent;
}

.nav-item i {
    font-size: 1.25rem;
    transition: var(--transition);
}

.nav-item:hover, .nav-item.active {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.03);
    border-color: var(--border-color);
}

.nav-item.active {
    background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.15), rgba(var(--accent-rgb), 0.05));
    border-color: var(--border-active);
    box-shadow: inset 0 0 12px rgba(var(--accent-rgb), 0.05);
}

.nav-item.active i {
    color: var(--accent);
    transform: scale(1.1);
}

.user-profile-section {
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 1.2rem;
    box-shadow: 0 4px 10px rgba(var(--accent-rgb), 0.3);
}

.user-details {
    display: flex;
    flex-direction: column;
}

.username-display {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.user-status {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.btn-logout {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
}

.btn-logout:hover {
    color: var(--danger);
    transform: translateX(3px);
}

/* Main Content Styling */
.main-content {
    flex-grow: 1;
    height: 100vh;
    overflow-y: auto;
    padding: 2rem 3rem;
    position: relative;
}

/* Auth Screens */
.auth-wrapper {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-app);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.auth-card {
    width: 100%;
    max-width: 420px;
    padding: 2.5rem;
    background-color: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    text-align: center;
    animation: fadeIn 0.4s ease-out;
}

.auth-header h2 {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.auth-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 2rem;
}

.form-group {
    text-align: left;
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-input {
    width: 100%;
    padding: 0.85rem 1rem;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 10px rgba(var(--accent-rgb), 0.15);
}

.btn-primary {
    width: 100%;
    padding: 0.9rem;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    border: none;
    border-radius: var(--border-radius-md);
    color: white;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(var(--accent-rgb), 0.25);
    transition: var(--transition);
    margin-top: 1rem;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(var(--accent-rgb), 0.35);
}

.btn-learned-toggle:hover {
    transform: translateY(-2px) !important;
    box-shadow: 0 4px 12px rgba(6, 214, 160, 0.2);
}

.btn-secondary {
    width: 100%;
    padding: 0.9rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 0.5rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--text-secondary);
    transform: translateY(-2px);
}

.auth-footer {
    margin-top: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.auth-footer a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
}

/* Dashboard Screen */
.dashboard-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

.welcome-banner {
    grid-column: 1 / -1;
    background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.15), rgba(var(--accent-rgb), 0.05));
    border: 1px solid var(--border-active);
    border-radius: var(--border-radius-lg);
    padding: 2.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.welcome-text h1 {
    font-family: var(--font-heading);
    font-size: 1.7rem;
    margin-bottom: 0.5rem;
}

.welcome-text p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 500px;
}

.welcome-illustration {
    font-size: 6rem;
    opacity: 0.85;
    animation: float 4s ease-in-out infinite;
}

.card {
    background-color: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 1.75rem;
    box-shadow: var(--shadow-md);
}

.card-title {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-title i {
    color: var(--accent);
}

/* Progress Stats Grid */
.stats-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.stat-box {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
}

.stat-value {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.stat-progress {
    width: 100%;
    height: 6px;
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 3px;
    overflow: hidden;
}

.stat-progress-bar {
    height: 100%;
    background: linear-gradient(to right, var(--accent), var(--accent-hover));
    border-radius: 3px;
    transition: width 0.8s ease-out;
}

/* Level & Category Selectors */
.controls-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    gap: 1rem;
    flex-wrap: wrap;
}

.level-badges {
    display: flex;
    gap: 0.5rem;
}

.level-badge {
    padding: 0.5rem 1.2rem;
    border-radius: 30px;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
    transition: var(--transition);
}

.level-badge:hover, .level-badge.active {
    color: white;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    border-color: transparent;
    box-shadow: 0 4px 12px rgba(var(--accent-rgb), 0.3);
}

.level-badge.active {
    transform: scale(1.05);
}

.search-input-wrapper {
    position: relative;
    width: 300px;
}

.search-input-wrapper i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.search-input {
    width: 100%;
    padding: 0.65rem 1rem 0.65rem 2.5rem;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 30px;
    color: var(--text-primary);
    font-family: var(--font-body);
}

/* Vocabulary / Words Screen */
.words-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.word-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 1.5rem;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.word-card:hover {
    transform: translateY(-3px);
    border-color: var(--border-active);
    box-shadow: var(--shadow-md);
}

.word-card.learned {
    border-color: rgba(6, 214, 160, 0.4);
    background: linear-gradient(135deg, rgba(6, 214, 160, 0.05), rgba(25, 20, 45, 0.45));
}

.word-card.learned .learned-indicator {
    color: var(--success);
}

.word-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
}

.word-title {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    cursor: pointer;
}

.word-title:hover {
    color: var(--accent);
}

.word-phonetic {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-style: italic;
    margin-bottom: 1rem;
}

.word-translation {
    font-size: 1.05rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.word-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
}

.btn-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background-color: rgba(255, 255, 255, 0.02);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.btn-icon:hover {
    color: var(--accent);
    border-color: var(--border-active);
    background-color: rgba(var(--accent-rgb), 0.1);
    transform: scale(1.05);
}

.btn-icon.learned-indicator:hover {
    color: var(--success);
    border-color: rgba(6, 214, 160, 0.4);
    background-color: rgba(6, 214, 160, 0.1);
}

.word-level-tag {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    background-color: rgba(var(--accent-rgb), 0.15);
    color: var(--accent);
    font-weight: 600;
}

/* Sentences Screen */
.category-menu {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    padding-bottom: 0.75rem;
    margin-bottom: 1.5rem;
}

.category-tab {
    padding: 0.45rem 1rem;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 30px;
    font-size: 0.9rem;
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition);
}

.category-tab:hover, .category-tab.active {
    border-color: var(--accent);
    color: var(--accent);
}

.sentences-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.sentence-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 1.75rem;
    transition: var(--transition);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.sentence-card:hover {
    border-color: var(--border-active);
    box-shadow: var(--shadow-md);
}

.sentence-content {
    flex-grow: 1;
}

/* Word-by-Word Rendering for TTS */
.interactive-text {
    font-size: 1.35rem;
    font-weight: 600;
    line-height: 1.6;
    margin-bottom: 0.75rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
}

.sentence-word {
    padding: 0 3px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.15s ease;
    border-bottom: 1px dashed var(--text-muted);
}

.sentence-word:hover {
    background-color: rgba(var(--accent-rgb), 0.15);
    color: var(--accent);
    border-bottom-color: var(--accent);
}

/* Dynamic TTS Highlighting */
.sentence-word.speaking-active {
    background: linear-gradient(135deg, var(--accent), var(--accent-hover)) !important;
    color: white !important;
    box-shadow: 0 0 15px rgba(var(--accent-rgb), 0.6);
    border-radius: 6px;
    border-bottom-color: transparent;
    transform: scale(1.08);
}

/* Aligned Translation Vurgulama */
.sentence-word.hover-highlight {
    background-color: rgba(var(--accent-rgb), 0.25);
    color: var(--text-primary);
    border-bottom-color: var(--accent);
}

.translation-text {
    font-size: 1.05rem;
    color: var(--text-secondary);
    font-weight: 400;
    transition: var(--transition);
}

.translation-text.highlighted {
    color: var(--accent);
    text-shadow: 0 0 8px rgba(var(--accent-rgb), 0.2);
}

/* Stories Screen */
.stories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
}

.story-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: var(--transition);
    height: 380px;
}

.story-card:hover {
    transform: translateY(-5px);
    border-color: var(--border-active);
    box-shadow: var(--shadow-lg);
}

.story-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.story-card-title {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
}

.story-card-tr {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
}

.story-card-preview {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.6;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 5;
    -webkit-box-orient: vertical;
    margin-bottom: auto;
}

/* Detailed Story View */
.story-reader-view {
    animation: fadeIn 0.4s ease;
}

.story-reader-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.5rem;
    margin-bottom: 2rem;
}

.story-titles h2 {
    font-family: var(--font-heading);
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.story-titles h3 {
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.story-reader-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.story-panel {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 2.5rem;
    min-height: 400px;
    line-height: 1.8;
    font-size: 1.15rem;
}

.story-panel h4 {
    font-family: var(--font-heading);
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    color: var(--accent);
}

.story-panel.english-content {
    font-size: 1.2rem;
}

/* AI Assistant Screen */
.chat-container {
    height: 60vh;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    margin-top: 1.5rem;
}

.chat-messages {
    flex-grow: 1;
    padding: 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chat-message {
    max-width: 75%;
    padding: 1rem 1.25rem;
    border-radius: var(--border-radius-md);
    line-height: 1.5;
    font-size: 0.95rem;
    animation: slideUp 0.3s ease-out;
}

.chat-message.assistant {
    background-color: rgba(255, 255, 255, 0.03);
    align-self: flex-start;
    border-bottom-left-radius: 2px;
    border: 1px solid var(--border-color);
}

.chat-message.user {
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 2px;
}

.chat-message.assistant h3, .chat-message.assistant h4 {
    margin: 0.75rem 0 0.5rem;
    font-family: var(--font-heading);
}

.chat-message.assistant ul {
    margin-left: 1.25rem;
    margin-bottom: 0.5rem;
}

.chat-input-bar {
    padding: 1.25rem;
    border-top: 1px solid var(--border-color);
    background-color: rgba(0, 0, 0, 0.1);
    display: flex;
    gap: 1rem;
}

.chat-input {
    flex-grow: 1;
    padding: 0.85rem 1.25rem;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 30px;
    color: var(--text-primary);
    font-family: var(--font-body);
}

.chat-input:focus {
    outline: none;
    border-color: var(--accent);
}

.btn-send {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    color: white;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(var(--accent-rgb), 0.3);
    transition: var(--transition);
}

.btn-send:hover {
    transform: rotate(15deg) scale(1.05);
}

/* Profil & Settings Screen */
.profile-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 2rem;
    margin-top: 1.5rem;
}

.profile-card {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2.5rem 1.75rem;
}

.profile-avatar-large {
    width: 90px;
    height: 90px;
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.settings-card h3 {
    font-family: var(--font-heading);
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.settings-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.theme-options {
    display: flex;
    gap: 0.5rem;
}

.theme-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
}

.theme-btn.active {
    border-color: var(--text-primary);
    transform: scale(1.1);
}

.theme-btn.purple { background-color: #9d4edd; }
.theme-btn.blue { background-color: #00b4d8; }
.theme-btn.emerald { background-color: #06d6a0; }

.api-key-container {
    display: flex;
    gap: 0.5rem;
    width: 100%;
}

.api-key-input {
    flex-grow: 1;
}

/* Modals & Popups */
.word-lookup-popup {
    position: fixed;
    background-color: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-active);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    padding: 1.25rem;
    width: 250px;
    z-index: 1000;
    pointer-events: auto;
    animation: scaleIn 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.word-lookup-popup::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border-width: 8px;
    border-style: solid;
    border-color: var(--border-active) transparent transparent transparent;
}

.lookup-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.lookup-word {
    font-weight: 700;
    font-size: 1.15rem;
}

.lookup-phonetic {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: italic;
}

.lookup-translation {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.btn-lookup-speak {
    background: none;
    border: none;
    color: var(--accent);
    cursor: pointer;
    font-size: 1.1rem;
}

/* AI Database Expansion Utility (Dashboard) */
.ai-seeder-box {
    margin-top: 1.5rem;
    background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.05), rgba(var(--accent-rgb), 0.01));
    border: 1px dashed var(--border-active);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.ai-seeder-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.ai-seeder-actions {
    display: flex;
    gap: 0.75rem;
}

.btn-seeder {
    padding: 0.65rem 1rem;
    background-color: rgba(var(--accent-rgb), 0.1);
    border: 1px solid var(--border-active);
    color: var(--accent);
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.btn-seeder:hover {
    background-color: var(--accent);
    color: white;
}

.btn-seeder:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

@keyframes slideUp {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

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

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.text-center {
    text-align: center;
}

.loader {
    width: 24px;
    height: 24px;
    border: 3px solid rgba(255,255,255,0.1);
    border-radius: 50%;
    border-top-color: var(--accent);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Responsive adjustments */
@media (max-width: 992px) {
    .app-container {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: auto;
        padding: 1rem 1.5rem;
        flex-direction: row;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        box-sizing: border-box !important;
    }
    .sidebar > div {
        display: flex !important;
        flex-direction: row !important;
        align-items: center !important;
        width: 100% !important;
        overflow: hidden !important;
        gap: 1.5rem !important;
    }
    .logo-section {
        margin-bottom: 0 !important;
        flex: 0 0 auto !important;
    }
    .nav-links {
        display: flex !important;
        flex-direction: row !important;
        flex-wrap: nowrap !important; /* Alt satıra kayma engellendi */
        gap: 0.25rem;
        overflow-x: auto !important;
        -webkit-overflow-scrolling: touch;
    }
    .nav-links li {
        flex: 0 0 auto !important;
        list-style: none !important;
    }
    .user-profile-section {
        display: none;
    }
    .main-content {
        padding: 1.5rem;
        height: calc(100vh - 80px);
    }
    .dashboard-grid, .profile-grid, .story-reader-grid {
        grid-template-columns: 1fr;
    }
}

/* Flashcard Slider & Control Styles */
.flashcard-slider-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    max-width: 700px;
    margin: 2rem auto;
    animation: fadeIn 0.4s ease;
}

.flashcard-card {
    width: 100%;
    min-height: 350px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 3rem 2rem;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    position: relative;
    transition: var(--transition);
}

.flashcard-card:hover {
    border-color: var(--border-active);
}

.word-title-large {
    font-family: var(--font-heading);
    font-size: 3.8rem;
    font-weight: 800;
    letter-spacing: -1px;
    background: linear-gradient(135deg, var(--text-primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
}

.word-title-large:hover {
    transform: scale(1.03);
}

.phonetic-large {
    font-size: 1.2rem;
    color: var(--text-muted);
    font-style: italic;
    margin-bottom: 2rem;
}

.translation-large {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--accent);
    text-shadow: 0 0 10px rgba(var(--accent-rgb), 0.2);
}

.sentence-flashcard .interactive-text {
    font-size: 1.8rem;
    font-weight: 700;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.sentence-flashcard .translation-text {
    font-size: 1.4rem;
    color: var(--text-secondary);
}

/* Flashcard Control Panel */
.flashcard-controls-panel {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    padding: 1.5rem 2rem;
}

.playback-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    width: 100%;
}

.playback-controls .btn-icon {
    width: 48px;
    height: 48px;
    font-size: 1.2rem;
}

.playback-controls .btn-primary {
    font-size: 1.1rem;
    padding: 0.8rem 2rem;
}

.control-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* Speed Slider Styling */
.speed-slider {
    -webkit-appearance: none;
    width: 150px;
    height: 6px;
    border-radius: 5px;
    background: var(--bg-input);
    outline: none;
    transition: background 0.3s;
    border: 1px solid var(--border-color);
}

.speed-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: 0 0 8px rgba(var(--accent-rgb), 0.5);
    transition: var(--transition);
}

.speed-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* Toggle Switch Switcher */
.toggle-switch {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    user-select: none;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 22px;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 34px;
    transition: .4s;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background-color: var(--text-secondary);
    border-radius: 50%;
    transition: .4s;
}

input:checked + .toggle-slider {
    background-color: rgba(var(--accent-rgb), 0.2);
    border-color: var(--border-active);
}

input:checked + .toggle-slider:before {
    transform: translateX(22px);
    background-color: var(--accent);
}

/* Flashcard AI Images */
.flashcard-image-wrapper {
    width: 100%;
    max-width: 320px;
    height: 180px;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
    background-color: rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    box-shadow: var(--shadow-sm);
}

.flashcard-image-wrapper::before {
    content: "\f03e";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    font-size: 2rem;
    color: var(--text-muted);
    position: absolute;
    z-index: 1;
}

.flashcard-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 2;
    transition: opacity 0.4s ease;
    opacity: 1; /* Resmin görünür olması garanti altına alındı (CSP engellemelerini aşmak için) */
}

.flashcard-image.loaded {
    opacity: 1;
}

/* Responsive Overrides (Mobile & Tablet) */
@media (max-width: 992px) {
    /* Prevent layout shifting */
    body, .app-container {
        overflow-x: hidden !important;
        max-width: 100% !important;
        width: 100% !important;
    }
    
    .main-content {
        padding: 1rem !important;
        overflow-x: hidden !important;
        width: 100% !important;
        max-width: 100% !important;
    }

    .controls-bar {
        display: flex !important;
        flex-direction: column !important;
        align-items: stretch !important;
        width: 100% !important;
        max-width: 100% !important;
        overflow: hidden !important;
        gap: 0.75rem !important;
    }

    /* Horizontal swipe menu for top filters */
    .level-badges, .category-menu {
        display: flex !important;
        overflow-x: auto !important;
        white-space: nowrap !important;
        flex-wrap: nowrap !important; /* Alt satıra kayma engellendi, kaydırma aktif edildi */
        max-width: 100% !important;
        box-sizing: border-box !important;
        padding-bottom: 0.5rem !important;
        width: 100% !important;
        gap: 0.5rem !important;
        -webkit-overflow-scrolling: touch;
    }
    
    .level-badges::-webkit-scrollbar, .category-menu::-webkit-scrollbar {
        display: none !important;
    }
    
    .level-badge, .category-tab {
        flex: 0 0 auto !important;
    }

    /* Hide desktop sidebar menu links on mobile/tablet */
    .sidebar .nav-links {
        display: none !important;
    }

    /* Mobile bottom navigation */
    .bottom-nav {
        display: flex !important;
        position: fixed !important;
        bottom: 0 !important;
        left: 0 !important;
        right: 0 !important;
        height: 60px !important;
        background-color: var(--bg-card) !important;
        border-top: 1px solid var(--border-color) !important;
        box-shadow: 0 -4px 15px rgba(0, 0, 0, 0.2) !important;
        z-index: 1000 !important;
        justify-content: space-around !important;
        align-items: center !important;
        padding: 0 0.25rem !important;
        box-sizing: border-box !important;
        backdrop-filter: var(--glass-blur) !important;
    }
    
    .bottom-nav-item {
        display: flex !important;
        flex-direction: column !important;
        align-items: center !important;
        justify-content: center !important;
        flex: 1 !important;
        height: 100% !important;
        color: var(--text-secondary) !important;
        text-decoration: none !important;
        font-size: 0.68rem !important;
        font-weight: 500 !important;
        gap: 0.2rem !important;
        cursor: pointer !important;
        transition: var(--transition) !important;
    }
    
    .bottom-nav-item i {
        font-size: 1.1rem !important;
        transition: var(--transition) !important;
    }
    
    .bottom-nav-item.active {
        color: var(--accent) !important;
    }
    
    .bottom-nav-item.active i {
        transform: translateY(-2px) !important;
        text-shadow: 0 0 10px rgba(var(--accent-rgb), 0.4) !important;
    }

    /* Adjust main-content heights to clear both headers */
    .main-content {
        margin-bottom: 60px !important; /* height of bottom nav */
        height: calc(100vh - 120px) !important; /* height minus top header and bottom nav */
        padding: 1rem !important;
        overflow-y: auto !important;
        box-sizing: border-box !important;
    }

    /* Clean header on mobile: logo left, logout right */
    .sidebar {
        display: flex !important;
        flex-direction: row !important;
        justify-content: space-between !important;
        align-items: center !important;
        padding: 0.5rem 1rem !important;
        height: 60px !important;
        box-sizing: border-box !important;
    }
    
    .sidebar > div {
        display: flex !important;
        flex-direction: row !important;
        align-items: center !important;
        width: auto !important;
        gap: 0 !important;
        overflow: visible !important;
    }

    .logo-section {
        margin-bottom: 0 !important;
        flex: 0 0 auto !important;
    }

    .sidebar .user-profile-section {
        display: flex !important;
        border-top: none !important;
        padding-top: 0 !important;
        margin-top: 0 !important;
        flex-direction: row !important;
        align-items: center !important;
        gap: 0.5rem !important;
    }

    .sidebar .user-info {
        display: none !important;
    }

    .sidebar .btn-logout {
        margin: 0 !important;
        padding: 0.5rem !important;
        width: 36px !important;
        height: 36px !important;
        display: flex !important;
        align-items: center !important;
        justify-content: center !important;
        border-radius: var(--border-radius-sm) !important;
    }

    /* Resize flashcards for small screens */
    .flashcard-slider-wrapper {
        width: 100% !important;
        padding: 0 0.25rem !important;
        margin: 0.5rem auto !important;
    }
    
    .flashcard-card {
        padding: 1.5rem 1rem !important;
        min-height: 260px !important;
    }
    
    .word-title-large {
        font-size: 2.5rem !important;
    }
    
    .translation-large {
        font-size: 1.3rem !important;
    }
    
    .sentence-flashcard .interactive-text span {
        font-size: 1.25rem !important;
    }
    
    .sentence-flashcard .translation-text {
        font-size: 1.05rem !important;
    }
    
    .flashcard-image-wrapper {
        max-width: 100%;
        height: 120px;
        margin-bottom: 1rem;
    }

    /* Stack settings rows on mobile */
    .settings-row {
        flex-direction: column !important;
        align-items: flex-start !important;
        gap: 1rem !important;
        width: 100% !important;
    }

    /* Stack theme option buttons beautifully on mobile */
    .settings-row .theme-options {
        margin-top: 0.25rem;
    }

    /* Scale down story panels on mobile */
    .story-panel {
        padding: 1.5rem !important;
        min-height: auto !important;
        font-size: 1.05rem !important;
    }

    /* Fix dashboard stats container columns on mobile */
    .stats-container {
        grid-template-columns: 1fr !important;
        gap: 1rem !important;
    }

    /* Fix AI seeder container and action buttons on mobile */
    .ai-seeder-row {
        flex-direction: column !important;
        align-items: stretch !important;
        gap: 1rem !important;
    }
    
    .ai-seeder-actions {
        flex-direction: column !important;
        width: 100% !important;
        gap: 0.5rem !important;
    }
    
    .btn-seeder {
        width: 100% !important;
        text-align: center !important;
    }

    /* Fix grid layouts overflowing on small screens */
    .stories-grid, .words-grid {
        grid-template-columns: 1fr !important;
        gap: 1rem !important;
    }

    /* Fix detailed story reading header elements overlap on mobile */
    .story-reader-header {
        flex-direction: column !important;
        gap: 1rem !important;
        align-items: center !important;
        text-align: center !important;
    }
    
    .story-reader-header .btn-seeder {
        width: 100% !important;
    }

    /* Fix welcome banner illustration squeezing and text layout */
    .welcome-banner {
        flex-direction: column !important;
        align-items: flex-start !important;
        gap: 1rem !important;
        padding: 1.5rem !important;
    }
    
    .welcome-illustration {
        display: none !important;
    }

    /* Fix API Key container row stacking on mobile */
    .api-key-container {
        flex-direction: column !important;
        gap: 0.75rem !important;
    }
    
    .api-key-container .btn-primary {
        width: 100% !important;
    }
}

/* Bottom Navigation Bar default hidden on desktop */
.bottom-nav {
    display: none;
}