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

:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --background: #0f172a;
    --surface: #1e293b;
    --surface-light: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --user-message: #6366f1;
    --assistant-message: #334155;
    --tool-call: #10b981;
    --error: #ef4444;
    --success: #10b981;
    --border-radius: 12px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

header {
    background: var(--surface);
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--surface-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.header-left {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.persona-indicator {
    display: none;
    align-items: center;
    padding: 0.625rem 1rem;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(99, 102, 241, 0.05) 100%);
    border-radius: var(--border-radius);
    border: 2px solid var(--primary-color);
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.2);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.persona-indicator::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.1), transparent);
    transition: left 0.5s;
}

.persona-indicator:hover::before {
    left: 100%;
}

.persona-indicator.persona-indicator-visible {
    animation: personaSlideIn 0.4s ease-out;
}

@keyframes personaSlideIn {
    from {
        opacity: 0;
        transform: translateX(-10px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateX(0) scale(1);
    }
}

.persona-indicator:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
    border-color: var(--primary-hover);
}

.persona-indicator-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.persona-badge {
    font-size: 1.5rem;
    line-height: 1;
    transition: transform 0.3s ease;
    display: inline-block;
}

.persona-badge.persona-badge-active {
    animation: personaPulse 2s ease-in-out infinite;
}

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

.persona-indicator:hover .persona-badge {
    transform: scale(1.15) rotate(5deg);
}

.persona-info {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
}

.persona-name {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1.2;
}

.persona-status {
    font-size: 0.7rem;
    color: var(--text-secondary);
    font-weight: 500;
    opacity: 0.8;
}

.persona-badge-inline {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    margin-left: 0.75rem;
    padding: 0.375rem 0.75rem;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(99, 102, 241, 0.1) 100%);
    border-radius: 8px;
    font-size: 0.75rem;
    color: var(--primary-color);
    font-weight: 600;
    border: 1px solid rgba(99, 102, 241, 0.3);
    transition: all 0.2s ease;
    cursor: help;
}

.persona-badge-inline:hover {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.3) 0%, rgba(99, 102, 241, 0.2) 100%);
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.persona-emoji {
    font-size: 0.9rem;
    line-height: 1;
}

.persona-text {
    font-size: 0.75rem;
}

.persona-switch-notification {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(99, 102, 241, 0.1) 100%);
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius);
    padding: 1rem 1.25rem;
    margin: 0.75rem 0;
    animation: personaNotificationSlideIn 0.4s ease-out;
    max-width: 85%;
    align-self: center;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2);
    position: relative;
    overflow: hidden;
}

.persona-switch-notification::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-color);
    animation: personaNotificationGlow 2s ease-in-out infinite;
}

@keyframes personaNotificationSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes personaNotificationGlow {
    0%, 100% {
        opacity: 1;
        box-shadow: 0 0 8px var(--primary-color);
    }
    50% {
        opacity: 0.7;
        box-shadow: 0 0 16px var(--primary-color);
    }
}

.notification-content {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    color: var(--primary-color);
    font-size: 0.9rem;
    font-weight: 600;
}

.notification-icon {
    font-size: 1.4rem;
    animation: personaIconSpin 0.6s ease-out;
}

.notification-icon-old {
    font-size: 1.2rem;
    opacity: 0.6;
    animation: personaIconFadeOut 0.5s ease-out;
}

.notification-arrow {
    font-size: 1rem;
    color: var(--primary-color);
    animation: arrowSlide 0.5s ease-out;
    margin: 0 0.25rem;
}

@keyframes personaIconSpin {
    from {
        transform: rotate(-180deg) scale(0);
    }
    to {
        transform: rotate(0) scale(1);
    }
}

@keyframes personaIconFadeOut {
    from {
        opacity: 1;
        transform: scale(1);
    }
    to {
        opacity: 0.6;
        transform: scale(0.9);
    }
}

@keyframes arrowSlide {
    from {
        opacity: 0;
        transform: translateX(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.notification-text {
    flex: 1;
    line-height: 1.4;
}

.status-wrapper {
    display: flex;
    align-items: center;
    padding: 0.5rem;
}

.status-indicator {
    font-size: 0.875rem;
    color: var(--success);
    animation: pulse 2s infinite;
    cursor: help;
    position: relative;
}

.status-indicator.disconnected {
    color: var(--error);
    animation: pulseError 1.5s infinite;
}

@keyframes pulseError {
    0%, 100% { 
        opacity: 1; 
        transform: scale(1);
    }
    50% { 
        opacity: 0.6; 
        transform: scale(1.1);
    }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chat-container::-webkit-scrollbar {
    width: 8px;
}

.chat-container::-webkit-scrollbar-track {
    background: var(--surface);
}

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

.chat-container::-webkit-scrollbar-thumb:hover {
    background: #475569;
}

.welcome-message {
    background: var(--surface);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--surface-light);
    max-width: 800px;
    margin: 0 auto;
}

.welcome-message h2 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.welcome-message ul {
    margin: 1rem 0;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

.welcome-message li {
    margin: 0.5rem 0;
}

.example-queries {
    margin-top: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.example-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.example-btn {
    background: var(--surface-light);
    color: var(--text-primary);
    border: 1px solid var(--surface-light);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    transition: all 0.2s;
}

.example-btn:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.message {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    border-radius: var(--border-radius);
    animation: slideIn 0.3s ease-out;
    max-width: 85%;
    word-wrap: break-word;
}

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

.message.user {
    align-self: flex-end;
    background: var(--user-message);
    color: white;
    margin-left: auto;
}

.message.assistant {
    align-self: flex-start;
    background: var(--assistant-message);
    color: var(--text-primary);
    border: 1px solid var(--surface-light);
}

.message.tool-call {
    align-self: flex-start;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--tool-call);
    color: var(--tool-call);
    font-size: 0.875rem;
    max-width: 100%;
}

.message-content {
    flex: 1;
}

.message-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.875rem;
    flex-wrap: wrap;
}

.assistant-icon {
    font-size: 1rem;
}

.assistant-label {
    color: var(--text-primary);
}

.message-text {
    line-height: 1.6;
    white-space: pre-wrap;
}

.message-text code {
    background: rgba(0, 0, 0, 0.3);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.message-text pre {
    background: rgba(0, 0, 0, 0.3);
    padding: 1rem;
    border-radius: 6px;
    overflow-x: auto;
    margin: 0.5rem 0;
}

.loading {
    display: inline-flex;
    gap: 0.25rem;
    align-items: center;
}

.loading-dot {
    width: 6px;
    height: 6px;
    background: var(--text-secondary);
    border-radius: 50%;
    animation: bounce 1.4s infinite;
}

.loading-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.loading-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes bounce {
    0%, 80%, 100% {
        transform: translateY(0);
        opacity: 0.5;
    }
    40% {
        transform: translateY(-8px);
        opacity: 1;
    }
}

.input-container {
    background: var(--surface);
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--surface-light);
}

.input-wrapper {
    display: flex;
    gap: 1rem;
    align-items: flex-end;
}

textarea {
    flex: 1;
    background: var(--surface-light);
    border: 1px solid var(--surface-light);
    color: var(--text-primary);
    padding: 0.875rem 1rem;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: inherit;
    resize: none;
    min-height: 50px;
    max-height: 200px;
    transition: border-color 0.2s;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

textarea::placeholder {
    color: var(--text-secondary);
}

.btn-primary, .btn-secondary {
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

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

.btn-secondary {
    background: var(--surface-light);
    color: var(--text-primary);
    border: 1px solid var(--surface-light);
}

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

.input-hint {
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: center;
}

kbd {
    background: var(--surface-light);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.75rem;
    border: 1px solid var(--surface);
}

.error-message {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error);
    color: var(--error);
    padding: 1rem;
    border-radius: var(--border-radius);
    margin: 1rem 0;
}

/* Responsive design */
@media (max-width: 768px) {
    header {
        padding: 1rem;
        flex-direction: column;
        align-items: flex-start;
    }

    .header-left {
        width: 100%;
    }

    header h1 {
        font-size: 1.25rem;
    }

    .header-actions {
        width: 100%;
        justify-content: space-between;
        margin-top: 0.5rem;
    }

    .persona-indicator {
        flex: 1;
        min-width: 0;
    }

    .persona-name {
        font-size: 0.8rem;
    }

    .persona-status {
        font-size: 0.65rem;
    }

    .chat-container {
        padding: 1rem;
    }

    .message {
        max-width: 95%;
    }

    .input-container {
        padding: 1rem;
    }

    .input-wrapper {
        flex-direction: column;
    }

    textarea {
        width: 100%;
    }

    .btn-primary {
        width: 100%;
        justify-content: center;
    }

    .persona-badge-inline {
        margin-left: 0.5rem;
        padding: 0.25rem 0.5rem;
    }
}

/* ==================== Authentication Styles ==================== */

.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1rem;
    background: var(--surface-light);
    border-radius: var(--border-radius);
    border: 1px solid var(--surface-light);
}

.username-display {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.875rem;
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.auth-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(8px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.auth-modal[style*="flex"] {
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.auth-modal-content {
    background: var(--surface);
    border-radius: var(--border-radius);
    border: 1px solid var(--surface-light);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    width: 90%;
    max-width: 450px;
    padding: 0;
    overflow: hidden;
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.auth-tabs {
    display: flex;
    border-bottom: 1px solid var(--surface-light);
    background: var(--surface-light);
}

.auth-tab {
    flex: 1;
    padding: 1rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    border-bottom: 2px solid transparent;
}

.auth-tab:hover {
    color: var(--text-primary);
    background: var(--surface);
}

.auth-tab.active {
    color: var(--primary-color);
    background: var(--surface);
    border-bottom-color: var(--primary-color);
}

.auth-form {
    display: none;
    padding: 2rem;
}

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

.auth-form h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-size: 1.5rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.875rem;
}

.form-group input {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--surface-light);
    border: 1px solid var(--surface-light);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s;
}

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

.form-group small {
    display: block;
    margin-top: 0.375rem;
    color: var(--text-secondary);
    font-size: 0.75rem;
}

.btn-full {
    width: 100%;
    justify-content: center;
    margin-top: 1rem;
}

.error-message {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error);
    color: var(--error);
    padding: 0.875rem 1rem;
    border-radius: var(--border-radius);
    margin-top: 1rem;
    font-size: 0.875rem;
    line-height: 1.5;
}

/* Responsive auth modal */
@media (max-width: 768px) {
    .auth-modal-content {
        width: 95%;
        margin: 1rem;
    }

    .auth-form {
        padding: 1.5rem;
    }

    .auth-form h2 {
        font-size: 1.25rem;
    }
}