/* WordLearn - Base Styles */
/* Mobile-first responsive design */

:root {
    /* Colors – SuWord family */
    --primary-color: #667eea;
    --primary-dark: #764ba2;
    --primary-light: #e8ebfd;
    --secondary-color: #4CAF50;
    --accent-color: #FF9800;
    --error-color: #F44336;
    --warning-color: #FF9800;
    --success-color: #4CAF50;
    --info-color: #2196F3;
    
    /* Text colors */
    --text-primary: #212121;
    --text-secondary: #757575;
    --text-disabled: #BDBDBD;
    --text-white: #FFFFFF;
    
    /* Background colors */
    --bg-primary: #FFFFFF;
    --bg-secondary: #FAFAFA;
    --bg-surface: #FFFFFF;
    --bg-dark: #303030;
    --bg-overlay: rgba(0, 0, 0, 0.5);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    
    /* Typography */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-md: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-xxl: 24px;
    --font-size-title: 28px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    
    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 50%;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    --z-toast: 1080;
}

/* Reset and base styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    line-height: 1.5;
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: var(--font-size-title); }
h2 { font-size: var(--font-size-xxl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5 { font-size: var(--font-size-md); }
h6 { font-size: var(--font-size-sm); }

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
}

/* Layout */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    background-color: var(--primary-color);
    color: var(--text-white);
    box-shadow: var(--shadow-md);
    z-index: var(--z-fixed);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 var(--spacing-md);
    position: relative;
}

.header-title {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    z-index: 1;
}

.header-title h1 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin: 0;
}

/* Header left and right positioning */
.header-content > *:first-child {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    z-index: 2;
}

.header-content > *:last-child {
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    z-index: 2;
}

.header-title .logo-link {
    color: var(--text-white);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.header-title .logo-link:hover {
    color: var(--primary-light);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Flag icons using CSS - more reliable than emoji */
.flag-icon {
    display: inline-block;
    width: 20px;
    height: 15px;
    border-radius: 2px;
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(0,0,0,0.1);
}

.flag-icon.flag-en {
    background: linear-gradient(to bottom, 
        #002868 0%, #002868 7.7%, 
        #ffffff 7.7%, #ffffff 15.4%, 
        #bf0a30 15.4%, #bf0a30 23.1%, 
        #ffffff 23.1%, #ffffff 30.8%, 
        #bf0a30 30.8%, #bf0a30 38.5%, 
        #ffffff 38.5%, #ffffff 46.2%, 
        #bf0a30 46.2%, #bf0a30 53.9%, 
        #ffffff 53.9%, #ffffff 61.6%, 
        #bf0a30 61.6%, #bf0a30 69.3%, 
        #ffffff 69.3%, #ffffff 77%, 
        #bf0a30 77%, #bf0a30 84.7%, 
        #ffffff 84.7%, #ffffff 92.4%, 
        #bf0a30 92.4%, #bf0a30 100%);
}

.flag-icon.flag-en::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 40%;
    height: 53.8%;
    background: #002868;
}

.flag-icon.flag-lt {
    background: linear-gradient(to bottom, 
        #fdb913 0%, #fdb913 33%, 
        #006a44 33%, #006a44 66%, 
        #c1272d 66%, #c1272d 100%);
}

/* Emoji flags for languages without CSS artwork */
.flag-emoji {
    display: inline-block;
    font-size: 17px;
    line-height: 1;
    flex-shrink: 0;
}

/* Language toggle styling */
.language-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.language-toggle .flag-text {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: white;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
}

/* Fallback text overlay for very old browsers that don't support CSS gradients */
@supports not (background: linear-gradient(to bottom, #fdb913 0%, #006a44 33%)) {
    .flag-icon.flag-en-text::after {
        content: 'EN';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 9px;
        font-weight: bold;
        color: white;
        text-shadow: 1px 1px 1px rgba(0,0,0,0.5);
        background: #012169;
    }

    .flag-icon.flag-lt-text::after {
        content: 'LT';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 9px;
        font-weight: bold;
        color: white;
        text-shadow: 1px 1px 1px rgba(0,0,0,0.5);
        background: #fdb913;
    }
}

/* Language Dropdown */
.language-dropdown {
    position: relative;
}

.language-toggle {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--text-white);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.language-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
}

.language-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 160px;
    max-height: min(70vh, 420px);
    overflow-y: auto;
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    margin-top: var(--spacing-xs);
}

.language-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.language-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: none;
    color: var(--text-primary);
    cursor: pointer;
    transition: background-color var(--transition-fast);
    text-align: left;
    font-size: var(--font-size-sm);
}

.language-option:first-child {
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.language-option:last-child {
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.language-option:hover {
    background-color: var(--bg-secondary);
}

.language-option.active {
    background-color: var(--primary-light);
    color: var(--primary-dark);
    font-weight: 500;
}

/* Profile Dropdown */
.profile-dropdown {
    position: relative;
}

.profile-toggle {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    width: 40px;
    height: 40px;
    color: var(--text-white);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.profile-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
}

.profile-toggle i {
    font-size: 18px;
}

.profile-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 240px;
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    margin-top: var(--spacing-xs);
    overflow: hidden;
}

.profile-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.profile-info {
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.profile-info .avatar {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-white);
    font-size: 18px;
    overflow: hidden;
    flex-shrink: 0;
}

.profile-info .user-details {
    flex: 1;
    min-width: 0;
}

.profile-info .user-details strong {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.profile-info .user-details small {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-top: 2px;
}

.profile-menu .menu-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-primary);
    text-decoration: none;
    transition: background-color var(--transition-fast);
    font-size: var(--font-size-sm);
}

.profile-menu .menu-item:hover {
    background-color: var(--bg-secondary);
}

.profile-menu .menu-item.logout {
    color: var(--error-color);
}

.profile-menu .menu-item.logout:hover {
    background-color: #ffebee;
}

.profile-menu .menu-divider {
    height: 1px;
    background: var(--border-color);
    margin: var(--spacing-xs) 0;
}

/* Side menu footer */
.side-menu-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

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

.app-info p {
    margin: var(--spacing-xs) 0;
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

.app-version {
    font-weight: 500;
}

.copyright {
    opacity: 0.7;
}

.main-content {
    margin-top: 0;
    margin-bottom: 0;
    min-height: auto;
}

.content-wrapper {
    padding: var(--spacing-md);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-md);
    font-weight: 500;
    text-align: center;
    text-decoration: none;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    min-height: 44px; /* Touch target */
    user-select: none;
    -webkit-user-select: none;
}

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

.btn-primary {
    background-color: var(--primary-color);
    color: var(--text-white) !important;
    font-weight: 600;
}

.btn-primary:hover:not(:disabled) {
    background-color: #5a6fd6;
    color: var(--text-white) !important;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.28);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-secondary:hover:not(:disabled) {
    background-color: rgba(102, 126, 234, 0.1);
    color: var(--primary-color) !important;
    border-color: var(--primary-color);
}

.btn-success {
    background-color: var(--success-color);
    color: var(--text-white);
}

.btn-warning {
    background-color: var(--warning-color);
    color: var(--text-white);
}

.btn-error {
    background-color: var(--error-color);
    color: var(--text-white);
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-lg);
    min-height: 48px;
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
    min-height: 36px;
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    background: none;
    border: none;
    border-radius: var(--radius-full);
    color: inherit;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.btn-icon:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.btn-icon i {
    font-size: var(--font-size-lg);
    pointer-events: none; /* Allow clicks to pass through to button */
}

.btn-red {
    color: var(--error-color);
    border: 1px solid var(--error-color);
}

.btn-red:hover {
    background-color: rgba(220, 53, 69, 0.1);
}

/* Cards */
.card {
    background-color: var(--bg-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
    transition: box-shadow var(--transition-fast);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid #E0E0E0;
}

.card-body {
    padding: var(--spacing-md);
}

.card-footer {
    padding: var(--spacing-md);
    border-top: 1px solid #E0E0E0;
    background-color: var(--bg-secondary);
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.form-control {
    display: block;
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-md);
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-surface);
    border: 2px solid #E0E0E0;
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast);
    min-height: 44px;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

.form-control::placeholder {
    color: var(--text-disabled);
}

textarea.form-control {
    resize: vertical;
    min-height: 80px;
}

.form-help {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

.form-error {
    font-size: var(--font-size-sm);
    color: var(--error-color);
    margin-top: var(--spacing-xs);
}

/* Loading */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
}

.loading-overlay.hidden {
    display: none;
}

.loading-spinner {
    text-align: center;
    color: var(--text-white);
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid var(--text-white);
    border-radius: var(--radius-full);
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Messages – elegant card style like JS Tests panel */
.messages-container {
    position: fixed;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
    width: min(480px, calc(100vw - 24px));
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}

.message {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    border: 2px solid #6c757d;
    animation: slideInDown 0.25s ease;
    pointer-events: all;
}

.message-success {
    background: #d4edda;
    border-color: #28a745;
    color: #155724;
}

.message-error {
    background: #f8d7da;
    border-color: #dc3545;
    color: #721c24;
}

.message-warning {
    background: #fff3cd;
    border-color: #ffc107;
    color: #856404;
}

.message-info {
    background: #d1ecf1;
    border-color: #17a2b8;
    color: #0c5460;
}

.message-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
    min-width: 0;
}

.message-icon {
    flex-shrink: 0;
    font-size: 0.95rem;
}

.message-success .message-icon { color: #28a745; }
.message-error   .message-icon { color: #dc3545; }
.message-warning .message-icon { color: #ffc107; }
.message-info    .message-icon { color: #17a2b8; }

.message-close {
    background: none;
    border: none;
    color: inherit;
    opacity: 0.6;
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
    transition: opacity 0.15s;
}

.message-close:hover {
    opacity: 1;
}

@keyframes slideInDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

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

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

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

.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--text-secondary); }
.text-success { color: var(--success-color); }
.text-warning { color: var(--warning-color); }
.text-error { color: var(--error-color); }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.p-0 { padding: 0; }
.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }

/* Responsive breakpoints */
@media (min-width: 768px) {
    .content-wrapper {
        max-width: 768px;
        margin: 0 auto;
        padding: var(--spacing-lg);
    }
    
    .btn {
        font-size: var(--font-size-md);
    }
}

@media (min-width: 1024px) {
    .content-wrapper {
        max-width: 1024px;
        padding: var(--spacing-xl);
    }
}

/* Print styles */
@media print {
    .header,
    .bottom-nav,
    .side-menu {
        display: none !important;
    }
    
    .main-content {
        margin: 0 !important;
    }
}

/* Media content styles (audio, images) */
.media-audio, .media-image {
    display: block;
    margin: 0.5rem 0;
    padding: 0.5rem;
    text-align: center;
    max-width: 100%;
}

.media-audio audio {
    display: block;
    margin: 0 auto;
    max-width: 100%;
}

.media-image img {
    display: block;
    margin: 0 auto;
    max-width: 100%;
    height: auto;
}

/* Hide technical details (file size, dimensions) in learning/dictionary view */
.media-audio small, .media-image small {
    display: none;
}

/* Donate Section Styles */
.donate-section {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    margin: var(--spacing-xl) 0;
}

.donate-header {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.donate-header h3 {
    font-size: var(--font-size-xl);
    margin: 0 0 var(--spacing-xs) 0;
    color: var(--text-primary);
}

.donate-header p {
    color: var(--text-secondary);
    margin: 0;
    font-size: var(--font-size-sm);
}

.donate-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    max-width: 700px;
    margin: 0 auto;
}

.donate-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: white;
    font-weight: 600;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.donate-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.donate-btn i {
    font-size: 1.2rem;
}

.donate-btn.paypal {
    background: linear-gradient(135deg, #0070ba, #1e88e5);
}

.donate-btn.boosty {
    background: linear-gradient(135deg, #ff6b35, #ff8c42);
}

.donate-btn.patreon {
    background: linear-gradient(135deg, #f96854, #ff424d);
}

.donate-btn.kofi {
    background: linear-gradient(135deg, #ff5e5b, #ff7d7d);
}

@media (max-width: 768px) {
    .donate-buttons {
        grid-template-columns: repeat(2, 1fr);
    }
}