:root {
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-surface-elevated: #ffffff;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-tertiary: #94a3b8;
    --color-accent: #0f172a;
    --color-accent-hover: #1e293b;
    --color-accent-light: #f1f5f9;
    --color-user-bubble: #0f172a;
    --color-assistant-bubble: #ffffff;
    --color-success: #10b981;
    --color-error: #ef4444;
    --color-line: #06c755;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;
    --border-radius-full: 9999px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --max-width: 720px;
}

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.5;
    min-height: 100vh;
    overflow: hidden;
}

.chatbot-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: var(--max-width);
    margin: 0 auto;
    background-color: var(--color-bg);
    border-left: 1px solid var(--color-border);
    border-right: 1px solid var(--color-border);
}

.chatbot-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background-color: var(--color-accent);
    color: #ffffff;
    flex-shrink: 0;
}

.header-content {
    display: flex;
    align-items: center;
    gap: 12px;
}

.avatar {
    position: relative;
    width: 44px;
    height: 44px;
}

.avatar-icon {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.15);
    color: #ffffff;
    border-radius: var(--border-radius-md);
}

.status-indicator {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 12px;
    height: 12px;
    background-color: var(--color-success);
    border: 2px solid var(--color-accent);
    border-radius: 50%;
}

.header-info h1 {
    font-size: 16px;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 2px;
    letter-spacing: -0.01em;
}

.header-dot {
    color: #0066cc;
}

.status-text {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.7);
}

.header-actions {
    display: flex;
    gap: 6px;
}

.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background-color: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: var(--border-radius-sm);
    color: rgba(255, 255, 255, 0.9);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background-color: rgba(255, 255, 255, 0.2);
    color: #ffffff;
}

.btn-icon.logged-in {
    background-color: var(--color-success);
    color: #ffffff;
}

.lang-label {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    background-color: var(--color-bg);
}

.chat-messages::-webkit-scrollbar {
    width: 4px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
    background-color: var(--color-border);
    border-radius: 2px;
}

.welcome-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 48px 24px;
    margin: auto;
}

.welcome-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-accent) 0%, #334155 100%);
    border-radius: var(--border-radius-lg);
    margin-bottom: 24px;
    color: #ffffff;
}

.welcome-title {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-text-primary);
}

.welcome-subtitle {
    font-size: 14px;
    color: var(--color-text-secondary);
    max-width: 320px;
    margin-bottom: 28px;
}

.line-bubble {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    background-color: var(--color-line);
    color: #ffffff;
    border-radius: var(--border-radius-full);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
}

.line-bubble:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.line-bubble .icon-line {
    fill: #ffffff;
}

.message {
    display: flex;
    max-width: 85%;
    animation: messageIn 0.25s ease;
}

@keyframes messageIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.message-assistant {
    align-self: flex-start;
}

.message-bubble {
    padding: 12px 16px;
    border-radius: var(--border-radius-lg);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.message-user .message-bubble {
    background-color: var(--color-user-bubble);
    color: #ffffff;
    border-bottom-right-radius: 4px;
}

.message-assistant .message-bubble {
    background-color: var(--color-assistant-bubble);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    border-bottom-left-radius: 4px;
    box-shadow: var(--shadow-sm);
}

.message-content {
    font-size: 15px;
    line-height: 1.6;
}

.message-content p {
    margin-bottom: 8px;
}

.message-content p:last-child {
    margin-bottom: 0;
}

.typing-indicator {
    display: flex;
    gap: 5px;
    padding: 16px 20px;
}

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

.typing-indicator span:nth-child(1) {
    animation-delay: 0s;
}

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

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

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.4;
    }
    30% {
        transform: translateY(-6px);
        opacity: 1;
    }
}

.quick-actions-container {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    flex-shrink: 0;
}

.quick-actions-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    cursor: pointer;
}

.quick-actions-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.quick-actions-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: none;
    border: none;
    color: var(--color-text-tertiary);
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.quick-actions-toggle.collapsed {
    transform: rotate(180deg);
}

.quick-actions-grid {
    padding: 0 16px 16px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.quick-actions-grid.hidden {
    display: none;
}

.quick-action-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.group-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.group-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.quick-action {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-full);
    color: var(--color-text-secondary);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.quick-action svg {
    flex-shrink: 0;
    color: var(--color-text-tertiary);
}

.quick-action:hover {
    background-color: var(--color-surface);
    color: var(--color-text-primary);
    border-color: var(--color-accent);
    box-shadow: var(--shadow-sm);
}

.quick-action:hover svg {
    color: var(--color-accent);
}

.quick-action.casual {
    background-color: var(--color-accent-light);
    border-color: var(--color-accent-light);
}

.quick-action.casual:hover {
    background-color: var(--color-surface);
    border-color: var(--color-accent);
}

.chat-input-container {
    padding: 12px 16px 16px;
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    flex-shrink: 0;
}

.chat-form {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 10px;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: 6px 8px 6px 14px;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-wrapper:focus-within {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(15, 23, 42, 0.06);
}

#message-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--color-text-primary);
    font-family: var(--font-family);
    font-size: 15px;
    line-height: 1.5;
    resize: none;
    max-height: 120px;
    outline: none;
    padding: 8px 0;
}

#message-input::placeholder {
    color: var(--color-text-tertiary);
}

.btn-send {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--color-accent);
    border: none;
    border-radius: var(--border-radius-sm);
    color: #ffffff;
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.btn-send:hover:not(:disabled) {
    background-color: var(--color-accent-hover);
    transform: scale(1.02);
}

.btn-send:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.disclaimer {
    font-size: 11px;
    color: var(--color-text-tertiary);
    text-align: center;
    margin-top: 6px;
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(248, 250, 252, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.error-message {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 14px;
    background-color: rgba(239, 68, 68, 0.06);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: var(--border-radius-md);
    color: var(--color-error);
    font-size: 14px;
    margin: 8px 0;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(15, 23, 42, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
    animation: fadeIn 0.2s ease;
}

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

.modal {
    background-color: var(--color-surface);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
    animation: slideUp 0.3s ease;
    overflow: hidden;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    background-color: var(--color-accent);
    color: #ffffff;
}

.modal-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.modal-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: rgba(255, 255, 255, 0.9);
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background-color: rgba(255, 255, 255, 0.2);
    color: #ffffff;
}

.modal-body {
    padding: 24px 20px;
}

.modal-description {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: 20px;
    text-align: center;
}

.lookup-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.lookup-form input {
    padding: 14px 16px;
    font-size: 18px;
    font-family: ui-monospace, SFMono-Regular, monospace;
    letter-spacing: 0.12em;
    text-align: center;
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    outline: none;
    transition: all var(--transition-fast);
}

.lookup-form input:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(15, 23, 42, 0.06);
}

.lookup-form input::placeholder {
    color: var(--color-text-tertiary);
    letter-spacing: 0.15em;
}

.btn-lookup-submit {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 20px;
    background-color: var(--color-accent);
    color: #ffffff;
    border: none;
    border-radius: var(--border-radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-lookup-submit:hover {
    background-color: var(--color-accent-hover);
}

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

.lookup-error {
    margin-top: 16px;
    padding: 12px 14px;
    background-color: rgba(239, 68, 68, 0.06);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: var(--border-radius-md);
    color: var(--color-error);
    font-size: 13px;
    text-align: center;
}

.lookup-result {
    padding: 20px;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
}

.result-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border);
}

.result-avatar {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-accent) 0%, #334155 100%);
    color: #ffffff;
    font-weight: 600;
    font-size: 16px;
    border-radius: var(--border-radius-md);
}

.result-name {
    flex: 1;
    min-width: 0;
}

.result-name h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.result-name span {
    font-size: 12px;
    color: var(--color-text-tertiary);
}

.result-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    border-radius: var(--border-radius-full);
    flex-shrink: 0;
}

.result-badge.verified {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
}

.result-badge.unverified {
    background-color: var(--color-bg);
    color: var(--color-text-tertiary);
    border: 1px solid var(--color-border);
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
}

.result-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.result-item.full {
    grid-column: span 2;
}

.result-label {
    font-size: 10px;
    font-weight: 600;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.result-value {
    font-size: 13px;
    color: var(--color-text-primary);
}

.result-value.mono {
    font-family: ui-monospace, SFMono-Regular, monospace;
    font-size: 12px;
    letter-spacing: 0.02em;
}

.profile-actions {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
}

.btn-logout {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 12px 16px;
    background-color: transparent;
    color: var(--color-error);
    border: 1px solid var(--color-error);
    border-radius: var(--border-radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-logout:hover {
    background-color: var(--color-error);
    color: #ffffff;
}

@media (max-width: 600px) {
    .chatbot-container {
        border: none;
    }

    .chatbot-header {
        padding: 10px 12px;
    }

    .avatar {
        width: 40px;
        height: 40px;
    }

    .avatar-icon svg {
        width: 20px;
        height: 20px;
    }

    .header-info h1 {
        font-size: 14px;
    }

    .btn-icon {
        width: 32px;
        height: 32px;
    }

    .chat-messages {
        padding: 16px 12px;
    }

    .welcome-message {
        padding: 40px 16px;
    }

    .welcome-icon {
        width: 64px;
        height: 64px;
    }

    .welcome-icon svg {
        width: 36px;
        height: 36px;
    }

    .welcome-title {
        font-size: 20px;
    }

    .welcome-subtitle {
        font-size: 13px;
    }

    .line-bubble {
        padding: 10px 16px;
        font-size: 13px;
    }

    .message {
        max-width: 90%;
    }

    .quick-actions-header {
        padding: 10px 12px;
    }

    .quick-actions-grid {
        padding: 0 12px 14px;
    }

    .group-buttons {
        gap: 6px;
    }

    .quick-action {
        padding: 6px 12px;
        font-size: 12px;
    }

    .chat-input-container {
        padding: 10px 12px 14px;
    }

    .input-wrapper {
        padding: 4px 6px 4px 12px;
    }

    .btn-send {
        width: 36px;
        height: 36px;
    }

    .modal {
        margin: 12px;
        max-width: none;
    }

    .modal-header {
        padding: 14px 16px;
    }

    .modal-body {
        padding: 20px 16px;
    }

    .lookup-form input {
        font-size: 16px;
        padding: 12px 14px;
    }

    .result-grid {
        grid-template-columns: 1fr;
    }

    .result-item.full {
        grid-column: span 1;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}