:root {
    /* Color Palette - Premium Dark Theme */
    --bg-primary: #0B0F19;
    --bg-secondary: #111827;
    --bg-tertiary: rgba(30, 41, 59, 0.7);
    
    --accent-primary: #3B82F6;
    --accent-primary-hover: #2563EB;
    --accent-secondary: #8B5CF6;
    --accent-primary-rgb: 59, 130, 246;
    --accent-secondary-rgb: 139, 92, 246;
    
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    
    --border-color: rgba(255, 255, 255, 0.1);
    --glass-bg: rgba(17, 24, 39, 0.6);
    --glass-border: rgba(255, 255, 255, 0.08);
    
    /* Typography */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
    
    /* Spacing & Radii */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Effects */
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px rgba(var(--accent-primary-rgb), 0.2);
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

:root.light-theme {
    --bg-primary: #F8FAFC;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: rgba(241, 245, 249, 0.7);
    
    --accent-primary: #2563EB;
    --accent-primary-hover: #1D4ED8;
    --accent-secondary: #E11D48;
    --accent-primary-rgb: 37, 99, 235;
    --accent-secondary-rgb: 225, 29, 72;
    
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #64748B;
    
    --border-color: rgba(0, 0, 0, 0.1);
    --glass-bg: rgba(255, 255, 255, 0.6);
    --glass-border: rgba(0, 0, 0, 0.08);
}


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

body {
    font-family: var(--font-body);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow: hidden;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(var(--accent-primary-rgb), 0.08), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(var(--accent-secondary-rgb), 0.08), transparent 25%);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--text-primary);
    font-weight: 600;
}

/* App Layout */
.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* Sidebar */
.sidebar {
    width: 320px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 10;
    box-shadow: var(--shadow-md);
}

.sidebar-header {
    padding: 32px 24px 24px;
    background: linear-gradient(to bottom, var(--bg-secondary) 80%, transparent);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.logo-icon {
    color: var(--accent-primary);
    width: 28px;
    height: 28px;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 0.85rem;
    color: var(--accent-secondary);
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.sidebar-search {
    margin: 0 24px 24px;
    position: relative;
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--text-muted);
}

.sidebar-search input {
    width: 100%;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 12px 12px 40px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.sidebar-search input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(var(--accent-primary-rgb), 0.2);
}

.topic-list {
    flex: 1;
    overflow-y: auto;
    padding: 0 16px 24px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.topic-list::-webkit-scrollbar {
    width: 6px;
}
.topic-list::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 10px;
}

.topic-item {
    padding: 14px 16px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-normal);
    border: 1px solid transparent;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.topic-item:hover {
    background: var(--bg-tertiary);
    border-color: var(--glass-border);
}

.topic-item.active {
    background: rgba(var(--accent-primary-rgb), 0.1);
    border-color: rgba(var(--accent-primary-rgb), 0.3);
    border-left: 3px solid var(--accent-primary);
}

.topic-item-day {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.topic-item-title {
    font-size: 0.95rem;
    color: var(--text-primary);
    font-weight: 500;
    line-height: 1.3;
}
.topic-item.active .topic-item-title {
    color: var(--accent-primary);
    font-weight: 600;
}

.topic-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.topic-item-check {
    color: #10b981;
    width: 16px;
    height: 16px;
    display: none;
}
.topic-item.completed .topic-item-check {
    display: block;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.content-header {
    height: 64px;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    padding: 0 32px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-primary);
    z-index: 5;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
}

.action-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
}

.action-btn:hover {
    color: var(--text-primary);
    background: var(--bg-secondary);
    transform: translateY(-2px);
}

.content-display {
    flex: 1;
    overflow-y: scroll;
    padding: 48px;
    scroll-behavior: smooth;
}
.content-display::-webkit-scrollbar {
    width: 12px;
}
.content-display::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
}
.content-display::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 10px;
    border: 3px solid var(--bg-secondary);
}
.content-display::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Welcome State */
.welcome-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    color: var(--text-secondary);
}

.welcome-icon-wrapper {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(var(--accent-primary-rgb), 0.1), rgba(var(--accent-secondary-rgb), 0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    border: 1px solid var(--glass-border);
}

.welcome-icon {
    width: 40px;
    height: 40px;
    color: var(--accent-primary);
}

.welcome-state h2 {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 12px;
}

/* Topic Content */
.topic-container {
    max-width: 900px;
    margin: 0 auto;
    padding-bottom: 60px;
}

.topic-hero {
    margin-bottom: 40px;
}

.topic-hero-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.topic-badge {
    display: inline-block;
    padding: 6px 12px;
    background: rgba(var(--accent-secondary-rgb), 0.15);
    color: var(--accent-secondary);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    border: 1px solid rgba(var(--accent-secondary-rgb), 0.3);
}

.mark-complete-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.mark-complete-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.mark-complete-btn.completed {
    background: rgba(16, 185, 129, 0.1);
    color: #10b981;
    border-color: rgba(16, 185, 129, 0.3);
}

.topic-title {
    font-size: 2.5rem;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 24px;
}

/* Cards */
.card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 28px;
    margin-bottom: 32px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 16px;
}

.card-icon {
    color: var(--accent-primary);
}

.question-content {
    font-size: 1.15rem;
    line-height: 1.7;
    color: var(--text-primary);
    font-weight: 400;
}
.question-content p {
    margin-bottom: 12px;
}
.question-content p:last-child {
    margin-bottom: 0;
}

/* Tabs */
.tabs-container {
    margin-top: 48px;
}

.tabs-header {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 16px;
    overflow-x: auto;
}

.tabs-header::-webkit-scrollbar {
    height: 4px;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 10px 20px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.tab-btn i {
    width: 18px;
    height: 18px;
}

.tab-btn:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.tab-btn.active {
    color: var(--accent-primary);
    background: rgba(var(--accent-primary-rgb), 0.1);
    box-shadow: inset 0 -2px 0 var(--accent-primary);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.tab-content {
    display: none;
    animation: fadeIn 0.4s ease forwards;
}

.tab-content.active {
    display: block;
}

/* Vocab Grid */
.vocab-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 20px;
}

.vocab-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    transition: var(--transition-normal);
}

.vocab-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
    border-color: rgba(var(--accent-primary-rgb), 0.4);
}

.vocab-card:hover .vocab-image img {
    transform: scale(1.05);
}

.vocab-word {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: 8px;
    font-family: var(--font-heading);
    display: flex;
    align-items: baseline;
    gap: 8px;
}

.vocab-type {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: italic;
    font-weight: 400;
}

.vocab-meaning {
    font-size: 0.95rem;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.5;
}

.vocab-example {
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding: 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    border-left: 2px solid var(--accent-secondary);
}

/* Essay Container */
.essay-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.essay-toggle {
    display: inline-flex;
    background: var(--bg-tertiary);
    padding: 4px;
    border-radius: 30px;
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
}

.essay-toggle span {
    padding: 8px 24px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    color: var(--text-secondary);
}

.essay-toggle span.active {
    background: var(--accent-primary);
    color: #fff;
    box-shadow: var(--shadow-sm);
}

.essay-text {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-primary);
}

.essay-text p {
    margin-bottom: 20px;
    text-indent: 20px;
}

.essay-text.hidden {
    display: none;
}

/* Analysis Content */
.analysis-content {
    background: linear-gradient(145deg, var(--bg-secondary), var(--bg-tertiary));
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    font-size: 1.05rem;
    line-height: 1.7;
}

.analysis-content p {
    margin-bottom: 16px;
}

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

.animate-fade-in {
    animation: fadeIn 0.5s ease forwards;
}

/* Loading */
.loading-spinner {
    width: 30px;
    height: 30px;
    border: 3px solid var(--border-color);
    border-radius: 50%;
    border-top-color: var(--accent-primary);
    animation: spin 1s ease-in-out infinite;
    margin: 40px auto;
}

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

/* Responsive */
@media (max-width: 900px) {
    .sidebar {
        position: absolute;
        left: -100%;
        height: 100%;
        transition: var(--transition-normal);
    }
    
    .sidebar.open {
        left: 0;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .content-header {
        justify-content: space-between;
    }
    
    .content-display {
        padding: 24px;
    }
    
    .topic-title {
        font-size: 2rem;
    }
}

@media (max-width: 600px) {
    .vocab-grid {
        grid-template-columns: 1fr;
    }
    .tabs-header {
        padding-bottom: 8px;
    }
}

/* Dictionary Tooltip */
.dict-tooltip {
    position: absolute;
    z-index: 1000;
    background: var(--bg-secondary);
    border: 1px solid var(--accent-primary);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    box-shadow: var(--shadow-md);
    max-width: 320px;
    font-size: 0.95rem;
    color: var(--text-primary);
    display: none;
    animation: fadeIn 0.2s ease forwards;
    line-height: 1.5;
}

.dict-tooltip.loading {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
}

.dict-tooltip-word {
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: 6px;
    border-bottom: 1px dashed var(--border-color);
    padding-bottom: 6px;
    font-family: var(--font-heading);
}

.dict-tooltip-meaning {
    color: var(--text-primary);
}

/* Chatbot UI */
.chat-toggle-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: #fff;
    border: none;
    box-shadow: var(--shadow-glow);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    transition: var(--transition-normal);
}

.chat-toggle-btn i {
    width: 28px;
    height: 28px;
}

.chat-toggle-btn:hover {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 0 25px rgba(var(--accent-secondary-rgb), 0.4);
}

.chatbot-container {
    position: fixed;
    bottom: 100px;
    right: 30px;
    width: 380px;
    height: 550px;
    max-height: calc(100vh - 120px);
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    overflow: hidden;
    opacity: 0;
    transform: translateY(20px) scale(0.95);
    pointer-events: none;
    transition: var(--transition-normal);
}

.chatbot-container.active {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: all;
}

.chatbot-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    background: rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.chat-action-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
}

.chat-action-btn:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.chatbot-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.chatbot-messages::-webkit-scrollbar {
    width: 6px;
}
.chatbot-messages::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 10px;
}

.chat-message {
    display: flex;
    flex-direction: column;
    max-width: 85%;
}

.chat-message.bot {
    align-self: flex-start;
}

.chat-message.user {
    align-self: flex-end;
}

.message-content {
    padding: 12px 16px;
    border-radius: 16px;
    font-size: 0.95rem;
    line-height: 1.5;
    word-break: break-word;
}

.chat-message.bot .message-content {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-bottom-left-radius: 4px;
}

.chat-message.user .message-content {
    background: var(--accent-primary);
    color: #fff;
    border-bottom-right-radius: 4px;
}

.chat-message.bot .message-content p {
    margin-bottom: 8px;
}
.chat-message.bot .message-content p:last-child {
    margin-bottom: 0;
}

.chat-message.bot .message-content ul, .chat-message.bot .message-content ol {
    margin-left: 20px;
    margin-bottom: 8px;
}

.chatbot-input {
    padding: 16px;
    border-top: 1px solid var(--border-color);
    background: rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: flex-end;
    gap: 12px;
}

.chatbot-input textarea {
    flex: 1;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    resize: none;
    outline: none;
    max-height: 120px;
    transition: var(--transition-fast);
}

.chatbot-input textarea:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(var(--accent-primary-rgb), 0.2);
}

.chatbot-input button {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: var(--accent-primary);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
    flex-shrink: 0;
}

.chatbot-input button:hover {
    background: var(--accent-primary-hover);
    transform: translateY(-2px);
}
.chatbot-input button:disabled {
    background: var(--bg-tertiary);
    color: var(--text-muted);
    cursor: not-allowed;
    transform: none;
}

@media (max-width: 600px) {
    .chatbot-container {
        width: calc(100% - 40px);
        right: 20px;
        bottom: 100px;
        height: 500px;
    }
}

/* Authentication & Profile Styling */
.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.login-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(var(--accent-primary-rgb), 0.3);
}

.login-btn i {
    width: 18px;
    height: 18px;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-tertiary);
    padding: 6px 12px;
    border-radius: 30px;
    border: 1px solid var(--border-color);
}

.user-profile.hidden {
    display: none;
}

.user-profile .avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    overflow: hidden;
    border: 2px solid var(--accent-primary);
}

.user-profile .avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

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

.user-info #userName {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.2;
}

.user-info .user-progress {
    font-size: 0.75rem;
    color: var(--accent-secondary);
    font-weight: 500;
}

.logout-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

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

/* Auth Modal */
.auth-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-normal);
}

.auth-modal.active {
    opacity: 1;
    pointer-events: all;
}

.auth-modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 420px;
    padding: 32px;
    position: relative;
    box-shadow: var(--shadow-md);
    transform: translateY(20px) scale(0.95);
    transition: var(--transition-normal);
    max-height: 90vh;
    overflow-y: auto;
}

.auth-modal-content::-webkit-scrollbar {
    width: 6px;
}
.auth-modal-content::-webkit-scrollbar-track {
    background: transparent;
}
.auth-modal-content::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 10px;
}
.auth-modal-content::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

.auth-modal.active .auth-modal-content {
    transform: translateY(0) scale(1);
}

.auth-close-btn {
    position: absolute;
    top: 16px;
    right: 16px;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition-fast);
}

.auth-close-btn:hover {
    color: var(--text-primary);
    transform: rotate(90deg);
}

.auth-header {
    text-align: center;
    margin-bottom: 24px;
}

.auth-header h2 {
    font-size: 1.8rem;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--text-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.auth-header p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.auth-tabs {
    display: flex;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    padding: 4px;
    margin-bottom: 24px;
}

.auth-tab {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 10px;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.auth-tab.active {
    background: var(--bg-secondary);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

.auth-form-container {
    display: none;
    animation: fadeIn 0.3s ease;
}

.auth-form-container.active {
    display: block;
}

.input-group {
    position: relative;
    margin-bottom: 16px;
}

.input-group i {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--text-muted);
}

.input-group input {
    width: 100%;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 14px 14px 14px 44px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    transition: var(--transition-fast);
    outline: none;
}

.input-group input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(var(--accent-primary-rgb), 0.2);
}

.auth-submit-btn {
    width: 100%;
    background: var(--accent-primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    padding: 14px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-normal);
    margin-top: 8px;
}

.auth-submit-btn:hover {
    background: var(--accent-primary-hover);
}

.auth-divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 24px 0;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--border-color);
}

.auth-divider span {
    padding: 0 10px;
}

.auth-google-btn {
    width: 100%;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 12px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.auth-google-btn:hover {
    background: var(--bg-tertiary);
}

/* Toast Notification */
.toast-container {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 12px;
    pointer-events: none;
}

.toast {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--accent-primary);
    padding: 16px 20px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 12px;
    transform: translateX(120%);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.toast.show {
    transform: translateX(0);
    opacity: 1;
}

.toast i {
    color: var(--accent-primary);
}

.toast-message {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.95rem;
}