/* CSS Variables */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --bg-glass: rgba(26, 26, 37, 0.7);
    
    --text-primary: #f0f0f5;
    --text-secondary: #a0a0b0;
    --text-muted: #606070;
    
    --accent: #8b5cf6;
    --accent-light: #a78bfa;
    --accent-dark: #7c3aed;
    --accent-glow: rgba(139, 92, 246, 0.3);
    
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    
    --border: rgba(255, 255, 255, 0.08);
    --border-light: rgba(255, 255, 255, 0.12);
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --sidebar-width: 280px;
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

/* App Layout */
.app {
    display: flex;
    height: 100vh;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(139, 92, 246, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(139, 92, 246, 0.05) 0%, transparent 50%),
        var(--bg-primary);
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid var(--border);
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, var(--accent-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-icon {
    font-size: 1.75rem;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.1); }
}

.characters-section {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
}

.section-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.characters-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.character-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.character-card:hover {
    background: var(--bg-tertiary);
    border-color: var(--border);
}

.character-card.active {
    background: var(--accent-glow);
    border-color: var(--accent);
}

.character-avatar {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
    overflow: hidden;
}

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

.character-card.active .character-avatar {
    box-shadow: 0 0 20px var(--accent-glow);
}

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

.character-tagline {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--success);
    animation: glow 2s ease-in-out infinite;
}

.status-dot.generating {
    background: var(--warning);
    animation: blink 1s ease-in-out infinite;
}

.status-dot.error {
    background: var(--danger);
    animation: none;
}

@keyframes glow {
    0%, 100% { box-shadow: 0 0 4px currentColor; }
    50% { box-shadow: 0 0 12px currentColor; }
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

/* Chat Container */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    position: relative;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.chat-container::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, 
        rgba(10, 10, 15, 0.3) 0%,
        rgba(10, 10, 15, 0.5) 50%,
        rgba(10, 10, 15, 0.7) 100%
    );
    z-index: 0;
}

.chat-header {
    padding: 16px 24px;
    background: rgba(26, 26, 37, 0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
    z-index: 2;
}

.current-character {
    display: flex;
    align-items: center;
    gap: 16px;
}

.character-avatar-large {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    overflow: hidden;
}

.character-avatar-large img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.character-info h2 {
    font-size: 1.1rem;
    font-weight: 600;
}

.character-info p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 2px;
}

.header-actions {
    display: flex;
    gap: 8px;
}

.btn-icon {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

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

/* Messages */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    position: relative;
    z-index: 1;
}

.messages {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
    position: relative;
    z-index: 1;
}

.welcome-message {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.welcome-icon {
    font-size: 3rem;
    margin-bottom: 16px;
    animation: float 3s ease-in-out infinite;
}

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

.welcome-message h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.message {
    display: flex;
    gap: 12px;
    animation: messageIn 0.3s ease-out;
}

@keyframes messageIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.user {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    flex-shrink: 0;
    overflow: hidden;
}

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

.message.user .message-avatar {
    background: var(--accent);
}

.message-content {
    max-width: 70%;
    padding: 12px 16px;
    border-radius: var(--radius-lg);
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
}

.message.user .message-content {
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    border: none;
}

.message-text {
    font-size: 0.95rem;
    line-height: 1.7;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.message-image {
    max-width: 100%;
    border-radius: var(--radius-md);
    margin-top: 8px;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.message-image:hover {
    transform: scale(1.02);
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 8px;
}

.message.user .message-time {
    color: rgba(255, 255, 255, 0.7);
}

.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 8px 0;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-muted);
    animation: typing 1.4s ease-in-out infinite;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {
    0%, 100% { transform: translateY(0); opacity: 0.4; }
    50% { transform: translateY(-6px); opacity: 1; }
}

/* Input Area */
.input-container {
    padding: 16px;
    position: relative;
    z-index: 2;
}

.input-box {
    max-width: 800px;
    margin: 0 auto;
    background: rgba(10, 10, 15, 0.6);
    backdrop-filter: blur(20px);
    padding: 16px;
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}



.btn-generate-prominent {
    width: 100%;
    max-width: 800px;
    margin: 0 auto 12px;
    padding: 14px 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 12px var(--accent-glow);
}

.btn-generate-prominent:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-glow);
}

.btn-generate-prominent:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
}

.input-wrapper {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    align-items: flex-end;
    gap: 12px;
    padding: 12px 12px 12px 20px;
    background: rgba(26, 26, 37, 0.9);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    transition: all 0.2s ease;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.input-wrapper:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow), 0 4px 16px rgba(0, 0, 0, 0.3);
}

.input-wrapper textarea {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    resize: none;
    max-height: 150px;
    padding: 8px 0;
    line-height: 1.5;
}

.input-wrapper textarea::placeholder {
    color: var(--text-muted);
}

.input-wrapper textarea:focus {
    outline: none;
}

.input-wrapper textarea:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.input-actions {
    display: flex;
    gap: 8px;
}

.btn-generate, .btn-send {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.btn-generate {
    background: var(--bg-secondary);
    color: var(--text-secondary);
}

.btn-generate:hover:not(:disabled) {
    background: var(--accent-glow);
    color: var(--accent-light);
}

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

.btn-send:hover:not(:disabled) {
    background: var(--accent-light);
    transform: scale(1.05);
}

.btn-generate:disabled, .btn-send:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.input-hint {
    max-width: 800px;
    margin: 8px auto 0;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    width: 90%;
    max-width: 500px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

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

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

.btn-close {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

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

.modal-body {
    padding: 24px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-group textarea {
    width: 100%;
    padding: 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9rem;
    resize: vertical;
    transition: all 0.2s ease;
}

.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

.btn-secondary, .btn-primary {
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

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

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

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

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

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

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    margin: 0 auto 20px;
    animation: spin 1s linear infinite;
}

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

.loading-content p {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.loading-hint {
    font-size: 0.85rem !important;
    color: var(--text-muted) !important;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Interactive Tutorial Overlay */
.tutorial-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 1000;
    display: none;
    pointer-events: all;
}

.tutorial-overlay.active {
    display: block;
}

.tutorial-highlight {
    position: relative;
    z-index: 1001;
}

.tutorial-message {
    position: fixed;
    bottom: 200px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    padding: 24px 32px;
    border-radius: var(--radius-xl);
    box-shadow: 0 8px 32px rgba(139, 92, 246, 0.5);
    z-index: 1002;
    max-width: 500px;
    text-align: center;
    animation: tutorialPulse 2s ease-in-out infinite;
}

@keyframes tutorialPulse {
    0%, 100% { transform: translateX(-50%) scale(1); }
    50% { transform: translateX(-50%) scale(1.02); }
}

.tutorial-message h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
    color: white;
}

.tutorial-message p {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 16px;
}

.tutorial-suggestion {
    background: rgba(255, 255, 255, 0.2);
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-style: italic;
    margin-top: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tutorial-suggestion:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.02);
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -100%;
        top: 0;
        height: 100%;
        z-index: 50;
        transition: left 0.3s ease;
    }
    
    .sidebar.open {
        left: 0;
    }
    
    .message-content {
        max-width: 85%;
    }
}