/* DocuFlow - Corporate Professional Styles */

/* ========== Theme Transitions ========== */
* {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* Exclude elements that shouldn't transition */
*:not(transition) {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* Disable transitions for performance-critical elements */
canvas,
video,
iframe,
svg {
    transition: none !important;
}

/* ========== Layout ========== */
.app-title {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.app-subtitle {
    font-size: 0.875rem;
    font-weight: 400;
    opacity: 0.8;
    margin-left: 1rem;
}

.header-left,
.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* Header Login Form */
.header-login-form {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-right: var(--spacing-md);
    flex-wrap: wrap;
    /* Ограничение ширины и позиционирование */
    max-width: 100%;
    position: relative;
}

.header-login-form input {
    flex: 1;
    min-width: 120px;
    max-width: 200px;
}

.header-login-form button {
    flex-shrink: 0;
    white-space: nowrap;
}

/* Стили для подсказки */
.header-login-form small {
    width: 100%;
    display: block;
    margin-top: var(--spacing-xs);
    order: 999; /* Переместить в конец */
}

.header-login-input {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--surface);
    color: var(--text-primary);
    font-size: 0.875rem;
    /* Убрать фиксированную ширину */
    min-width: 120px;
    max-width: 200px;
    width: auto;
}

.header-login-input:focus {
    outline: none;
    border-color: var(--primary);
}

.header-login-input::placeholder {
    color: var(--text-secondary);
}

/* Для мобильных устройств */
@media (max-width: 768px) {
    .header-login-form {
        flex-direction: column;
        width: 100%;
        margin-right: 0;
        /* Позиционирование для мобильных */
        position: absolute;
        top: 100%;
        right: 0;
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: 8px;
        padding: var(--spacing-md);
        box-shadow: 0 4px 12px var(--shadow);
        z-index: 1000;
        margin-top: var(--spacing-xs);
    }
    
    .header-login-form input,
    .header-login-form button {
        width: 100%;
        min-width: auto;
        max-width: none;
    }
    
    .header-login-form small {
        order: 999;
        margin-top: var(--spacing-sm);
    }
}

/* Для очень маленьких экранов */
@media (max-width: 480px) {
    .header-login-form {
        left: 0;
        right: 0;
        width: calc(100vw - 2rem);
        margin-left: 1rem;
        margin-right: 1rem;
    }
}

#header-user-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-right: var(--spacing-md);
}

/* ========== Buttons ========== */
.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: 4px;
    font-family: var(--font-family);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-icon {
    background: transparent;
    border: none;
    color: white;
    padding: var(--spacing-sm);
    cursor: pointer;
    font-size: 1.25rem;
    transition: all var(--transition);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    background: var(--accent-alpha);
}

/* Touch-friendly on mobile */
@media (max-width: 768px) {
    .btn-icon {
        min-height: var(--touch-target-min);
        min-width: var(--touch-target-min);
        touch-action: manipulation;
        -webkit-tap-highlight-color: transparent;
    }
}

/* ========== Sidebar ========== */
.sidebar-nav {
    padding: var(--spacing-md);
}

.nav-section {
    margin-bottom: var(--spacing-md);
}

.nav-section-primary {
    border-top: 2px solid var(--accent);
    padding-top: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.nav-section-primary:first-child {
    border-top: none;
    padding-top: 0;
    margin-top: 0;
}

.nav-section-hidden {
    display: none;
}

.nav-section-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    border-radius: 4px;
    transition: all var(--transition);
    user-select: none;
}

.nav-section-header:hover {
    background: var(--background);
}

.nav-section-header i:first-child {
    width: 20px;
    text-align: center;
    color: var(--accent);
    font-size: 1rem;
}

.nav-section-title {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: none;
    letter-spacing: 0;
    color: var(--text-primary);
    margin: 0;
    flex: 1;
}

.nav-section-toggle {
    width: 16px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.75rem;
    transition: transform var(--transition);
}

.nav-section-header.collapsed .nav-section-toggle {
    transform: rotate(-90deg);
}

.nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-sublist {
    margin-top: var(--spacing-xs);
    padding-left: var(--spacing-md);
    max-height: 0;
    overflow-y: auto;
    overflow-x: visible;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.nav-section-header:not(.collapsed) + .nav-sublist {
    max-height: none;
    padding-top: var(--spacing-xs);
    padding-bottom: var(--spacing-xs);
}

.nav-sublist-level2 {
    list-style: none;
    margin: 0;
    padding: 0;
    padding-left: var(--spacing-lg);
    max-height: 0;
    overflow-y: auto;
    overflow-x: visible;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.nav-item-group.expanded + .nav-sublist-level2 {
    max-height: none;
    padding-top: var(--spacing-xs);
    padding-bottom: var(--spacing-xs);
}

.nav-item {
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--text-primary);
    position: relative;
}

.nav-item i:first-child {
    width: 20px;
    text-align: center;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.nav-item:hover {
    background: var(--background);
}

.nav-item.active {
    background: var(--accent);
    color: white;
}

.nav-item.active i {
    color: white;
}

.nav-item-group {
    font-weight: 500;
}

.nav-item-group .nav-item-toggle {
    margin-left: auto;
    width: 16px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.75rem;
    transition: transform var(--transition);
}

.nav-item-group.expanded .nav-item-toggle {
    transform: rotate(90deg);
}

.nav-item-group:hover {
    background: var(--background);
}

/* ========== Document List ========== */
.document-list {
    padding: var(--spacing-lg);
    overflow-y: auto;
    height: 100%;
    flex: 1;
    min-height: 0; /* Critical for flex children to allow scrolling */
}

.document-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--spacing-md);
}

.document-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition);
    min-height: auto;
}

.document-card:hover {
    box-shadow: 0 4px 12px var(--shadow);
    transform: translateY(-2px);
}

.document-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--accent);
}

.document-name {
    font-weight: 600;
    font-size: 0.875rem;
    line-height: 1.4;
    margin-bottom: var(--spacing-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.document-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
}

/* ========== Document Viewer ========== */
.viewer-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 0; /* Critical for flex children */
    overflow: hidden;
}

.viewer-toolbar {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

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

.toolbar-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.875rem;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.toolbar-btn:hover {
    background: var(--background);
    border-color: var(--accent);
}

.toolbar-btn:active,
.toolbar-btn.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.viewer-content {
    flex: 1;
    overflow: auto;
    padding: var(--spacing-xl);
    background: var(--background);
    min-height: 0; /* Critical for flex children */
}

.document-container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--surface);
    box-shadow: 0 2px 8px var(--shadow);
    padding: var(--spacing-xl);
    border-radius: 4px;
}

/* ========== PDF Viewer ========== */
.pdf-canvas {
    display: block;
    margin: 0 auto var(--spacing-md);
    box-shadow: 0 2px 8px var(--shadow);
}

.pdf-page-info {
    text-align: center;
    padding: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ========== Markdown Viewer ========== */
.markdown-content {
    line-height: 1.8;
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3 {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    color: var(--primary);
}

.markdown-content code {
    background: var(--background);
    padding: 0.2em 0.4em;
    border-radius: 3px;
    font-family: var(--font-mono);
    font-size: 0.9em;
}

.markdown-content pre {
    background: var(--background);
    padding: var(--spacing-md);
    border-radius: 4px;
    overflow-x: auto;
}

.markdown-content pre code {
    background: none;
    padding: 0;
}

/* ========== TTS Controls ========== */
.tts-controls {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.tts-button {
    background: var(--accent);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--transition);
}

.tts-button:hover {
    background: var(--accent-hover);
}

.tts-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.tts-control-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.tts-control-group label {
    font-size: 0.875rem;
    font-weight: 500;
    min-width: 60px;
}

.tts-slider {
    width: 120px;
}

.tts-select {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-family: var(--font-family);
    font-size: 0.875rem;
}

/* ========== TTS Status ========== */
.tts-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: var(--spacing-sm);
    background: var(--accent-alpha);
    border-radius: 4px;
}

.tts-status-indicator {
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    animation: pulse 1.5s ease-in-out infinite;
}

.tts-status-text {
    font-size: 0.875rem;
    color: var(--accent);
    font-weight: 600;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.tts-status-text {
    font-size: 0.875rem;
    color: var(--accent);
    font-weight: 600;
}

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

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

.mt-1 {
    margin-top: var(--spacing-sm);
}

.mt-2 {
    margin-top: var(--spacing-md);
}

.mt-3 {
    margin-top: var(--spacing-lg);
}

.mb-1 {
    margin-bottom: var(--spacing-sm);
}

.mb-2 {
    margin-bottom: var(--spacing-md);
}

.mb-3 {
    margin-bottom: var(--spacing-lg);
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
    .app-container {
        grid-template-columns: 240px 1fr;
    }
    
    .app-sidebar {
        width: 240px;
    }
    
    .header-left, .header-right {
        gap: var(--spacing-sm);
    }
}

/* ========== Dashboard Styles ========== */
.dashboard-container {
    padding: var(--spacing-lg);
    height: 100%;
    overflow-y: auto;
}

.dashboard-header {
    margin-bottom: var(--spacing-xl);
}

.dashboard-header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.dashboard-header p {
    color: var(--text-secondary);
    font-size: 1rem;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.dashboard-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: var(--spacing-lg);
    transition: all var(--transition);
}

.dashboard-card:hover {
    box-shadow: 0 4px 12px var(--shadow);
    transform: translateY(-2px);
}

.dashboard-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

.dashboard-stat {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent);
    margin: 0;
}

.dashboard-card-icon {
    width: 60px;
    height: 60px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.dashboard-card-content {
    flex: 1;
}

.dashboard-sublabel {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

.dashboard-recent {
    margin-top: var(--spacing-xl);
}

.dashboard-recent h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.dashboard-recent-list {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: var(--spacing-md);
}

.dashboard-recent-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm);
    border-radius: 4px;
    cursor: pointer;
    transition: background var(--transition);
}

.dashboard-recent-item:hover {
    background: var(--background);
}

.dashboard-recent-item i {
    color: var(--text-secondary);
    width: 20px;
}

.dashboard-recent-item span:first-of-type {
    flex: 1;
    color: var(--text-primary);
}

.dashboard-recent-date {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border);
}

.page-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0;
    color: var(--text-primary);
}

.page-content {
    padding: var(--spacing-lg);
    background: var(--surface);
    border-radius: 8px;
    border: 1px solid var(--border);
}

.mobile-menu-btn {
    display: none;
}

.desktop-only {
    display: inline-flex;
}

.mobile-only {
    display: none;
}

@media (max-width: 768px) {
    .desktop-only {
        display: none !important;
    }
    
    .mobile-only {
        display: inline-flex !important;
    }
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: inline-flex !important;
        min-height: var(--touch-target-min);
        min-width: var(--touch-target-min);
    }

    .app-container {
        grid-template-areas:
            "header"
            "main"
            "bottom-nav";
        grid-template-columns: 1fr;
        grid-template-rows: 60px 1fr 60px;
    }

    /* ========== Mobile Header Optimization ========== */
    .app-header {
        padding: 0 var(--mobile-spacing-md);
        height: 60px;
        min-height: 60px;
    }

    .header-left {
        flex: 1;
        gap: var(--mobile-spacing-sm);
        min-width: 0; /* Allow shrinking */
    }

    .app-title {
        font-size: var(--mobile-font-size-lg);
        gap: var(--mobile-spacing-sm);
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .app-title i {
        font-size: 1.1rem;
        flex-shrink: 0;
    }

    .app-subtitle {
        display: none;
    }

    .header-right {
        flex-shrink: 0;
        gap: var(--mobile-spacing-xs);
    }

    /* Hide less important buttons on mobile */
    .header-right .btn-icon:not(#mobile-menu-btn):not(#search-btn):not(#user-menu-btn):not(#logout-btn) {
        display: none;
    }

    /* Touch-friendly buttons */
    .btn-icon {
        min-height: var(--touch-target-min);
        min-width: var(--touch-target-min);
        padding: var(--mobile-spacing-sm);
        font-size: 1.1rem;
        touch-action: manipulation;
        -webkit-tap-highlight-color: transparent;
    }

    /* Mobile User Menu */
    #header-user-section {
        gap: var(--mobile-spacing-xs);
        margin-right: 0;
    }

    /* Mobile User Menu Bottom Sheet */
    .mobile-user-menu {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: var(--surface);
        border-radius: 20px 20px 0 0;
        max-height: 50vh;
        overflow-y: auto;
        z-index: var(--z-modal);
        box-shadow: 0 -4px 12px var(--shadow-lg);
        transform: translateY(100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        padding: var(--mobile-spacing-lg);
        padding-bottom: calc(var(--mobile-spacing-lg) + env(safe-area-inset-bottom));
    }

    .mobile-user-menu.open {
        transform: translateY(0);
    }

    .mobile-user-menu-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        margin-bottom: var(--mobile-spacing-lg);
        padding-bottom: var(--mobile-spacing-md);
        border-bottom: 1px solid var(--border);
    }

    .mobile-user-menu-title {
        font-size: var(--mobile-font-size-lg);
        font-weight: 600;
        color: var(--text-primary);
    }

    .mobile-user-menu-close {
        min-height: var(--touch-target-min);
        min-width: var(--touch-target-min);
        display: flex;
        align-items: center;
        justify-content: center;
        background: transparent;
        border: none;
        color: var(--text-secondary);
        cursor: pointer;
        touch-action: manipulation;
    }

    .mobile-user-menu-item {
        display: flex;
        align-items: center;
        gap: var(--mobile-spacing-md);
        padding: var(--mobile-spacing-md);
        min-height: var(--touch-target-min);
        border-radius: 8px;
        cursor: pointer;
        transition: background 0.2s ease;
        color: var(--text-primary);
        text-decoration: none;
    }

    .mobile-user-menu-item:active {
        background: var(--surface-hover);
    }

    .mobile-user-menu-item i {
        width: 24px;
        text-align: center;
        color: var(--accent);
        font-size: 1.1rem;
    }

    .mobile-user-menu-item span {
        flex: 1;
        font-size: var(--mobile-font-size-base);
    }

    .mobile-user-menu-divider {
        height: 1px;
        background: var(--border);
        margin: var(--mobile-spacing-md) 0;
    }

    /* Sidebar уже стилизован в inline стилях как drawer */
    .sidebar-nav {
        padding: var(--mobile-spacing-md);
    }

    .nav-section-header {
        padding: var(--mobile-spacing-sm);
        min-height: var(--touch-target-min);
    }

    .nav-item {
        padding: var(--mobile-spacing-sm) var(--mobile-spacing-md);
        font-size: var(--mobile-font-size-sm);
        min-height: var(--touch-target-min);
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }

    .page-header h1 {
        font-size: 1.5rem;
    }
    
    .app-main {
        padding-bottom: 60px; /* Space for bottom navigation */
        min-height: 0; /* Critical for flex children */
    }
    
    .document-list {
        min-height: 0; /* Critical for scrolling */
    }

    .document-grid {
        grid-template-columns: 1fr;
        gap: var(--mobile-spacing-sm);
    }
    
    .document-card {
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: var(--mobile-spacing-md);
        padding: var(--mobile-spacing-md);
        min-height: var(--touch-target-min);
    }
    
    .document-icon {
        font-size: 1.5rem;
        margin-bottom: 0;
        flex-shrink: 0;
    }
    
    .document-name {
        flex: 1;
        min-width: 0; /* Критично для flex - позволяет сжиматься */
        font-size: var(--mobile-font-size-sm);
        margin-bottom: 0;
        white-space: normal;
        overflow-wrap: break-word;
        word-wrap: break-word;
        word-break: break-word;
        line-height: 1.3;
    }
    
    .document-meta {
        flex-direction: column;
        align-items: flex-end;
        font-size: var(--mobile-font-size-xs);
        gap: 0.125rem;
    }
    
    .viewer-toolbar {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }
    
    .toolbar-group {
        flex-wrap: wrap;
    }
    
    .toolbar-btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    .app-header {
        padding: 0 var(--spacing-sm);
    }
    
    .app-title {
        font-size: 1.25rem;
    }
    
    .document-card {
        padding: var(--mobile-spacing-sm);
        gap: var(--mobile-spacing-sm);
    }
    
    .document-icon {
        font-size: 1.25rem;
    }
    
    .document-name {
        font-size: var(--mobile-font-size-xs);
    }
    
    .viewer-content {
        padding: var(--spacing-sm);
    }
    
    .toolbar-btn {
        padding: var(--spacing-xs);
        font-size: 0.75rem;
    }
    
    .toolbar-btn i {
        font-size: 0.875rem;
    }
    
    .nav-item {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.875rem;
    }
}

/* ========== Scrollbar Styling ========== */
/* Scrollbar styles moved to scrollbars.css (Phase 15) */

/* ========== Settings Panel ========== */
.settings-panel {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

.settings-section {
    background: var(--card-background);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.settings-section h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin: 0 0 var(--spacing-md) 0;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.settings-section h3 i {
    color: var(--accent);
}

.settings-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.settings-group label {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.settings-group label span {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.settings-input {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-family: var(--font-family);
    font-size: 0.875rem;
    background: var(--background);
    color: var(--text-primary);
    transition: border-color var(--transition);
}

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

.settings-input[type="range"] {
    width: 100%;
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

.settings-input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
}

.settings-input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

.settings-checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.settings-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--accent);
}

.settings-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border);
}

.settings-actions .btn {
    flex: 1;
    justify-content: center;
}

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

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

#tts-rate-value {
    display: inline-block;
    min-width: 40px;
    text-align: right;
    font-weight: 600;
    color: var(--accent);
}

/* ========== Theme Preview ========== */
.theme-preview {
    transition: all var(--transition);
    border: 1px solid var(--border) !important;
    background: var(--surface) !important;
}

.theme-preview:hover {
    border-color: var(--accent) !important;
}

@media (max-width: 768px) {
    .settings-panel {
        padding: var(--spacing-md);
    }

    .settings-section {
        padding: var(--spacing-md);
    }

    .settings-actions {
        flex-direction: column;
    }
}

/* ========== PDF Viewer Annotations ========== */
.pdf-viewer-content {
    display: flex;
    gap: var(--spacing-md);
    position: relative;
}

.pdf-canvas-wrapper {
    position: relative;
    flex: 1;
    overflow: auto;
}

#pdf-annotations-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.annotation-overlay {
    position: absolute;
    pointer-events: auto;
    cursor: pointer;
    border: 2px solid var(--shadow);
    border-radius: 2px;
    transition: all 0.2s;
}

.annotation-overlay:hover {
    border-color: var(--accent);
    opacity: 0.5 !important;
}

.annotation-overlay.annotation-highlight {
    background-color: var(--warning-bg);
    opacity: 0.5;
    border-color: var(--warning);
}

.annotation-overlay.annotation-comment {
    background-color: var(--info-bg);
    opacity: 0.6;
    border-color: var(--info);
    border-radius: 50%;
    width: 20px !important;
    height: 20px !important;
}

.annotation-overlay.annotation-bookmark {
    background-color: var(--error-bg);
    opacity: 0.6;
    border-color: var(--error);
    border-radius: 50%;
    width: 15px !important;
    height: 15px !important;
}

.pdf-annotations-panel {
    width: 300px;
    background: var(--card-background);
    border-left: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    max-height: 100%;
    overflow: hidden;
    transition: transform 0.3s ease;
}

.pdf-annotations-panel:not(.open) {
    transform: translateX(100%);
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 100;
}

.pdf-annotations-panel.open {
    transform: translateX(0);
}

.annotations-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border);
}

.annotations-panel-header h3 {
    margin: 0;
    font-size: 1rem;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-xs);
    font-size: 1rem;
}

.close-btn:hover {
    color: var(--text-primary);
}

.annotations-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.annotations-empty {
    text-align: center;
    color: var(--text-secondary);
    padding: var(--spacing-lg);
}

.annotations-page-group {
    margin-bottom: var(--spacing-lg);
}

.annotations-page-header {
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.annotation-item {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    transition: all 0.2s;
}

.annotation-item:hover {
    border-color: var(--accent);
    box-shadow: 0 2px 4px var(--shadow);
}

.annotation-item.selected {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-alpha-30);
}

.annotation-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xs);
}

.annotation-type {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: capitalize;
    color: var(--text-secondary);
}

.annotation-type.highlight {
    color: var(--warning);
}

.annotation-type.comment {
    color: var(--info);
}

.annotation-type.bookmark {
    color: var(--error);
}

.annotation-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.annotation-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 2px 4px;
    font-size: 0.75rem;
    transition: color 0.2s;
}

.annotation-btn:hover {
    color: var(--accent);
}

.annotation-content {
    font-size: 0.875rem;
    color: var(--text-primary);
    margin-top: var(--spacing-xs);
    line-height: 1.4;
}

.annotation-color {
    width: 100%;
    height: 4px;
    border-radius: 2px;
    margin-top: var(--spacing-xs);
}

.toolbar-btn.active {
    background: var(--accent);
    color: white;
}

@media (max-width: 768px) {
    .pdf-viewer-content {
        flex-direction: column;
    }

    .pdf-annotations-panel {
        width: 100%;
        height: 50vh;
    }

    .pdf-annotations-panel:not(.open) {
        transform: translateY(100%);
    }
}