:root {
    --nera-bg: #10141f;
    --nera-container-bg: #1c2333;
    --nera-accent: #3375d6;
    --nera-text: #e1e1e1;
    --nera-text-muted: #8a93a5;
    --user-msg-bg: #3375d6;
    --ai-msg-bg: #2a3952;
    --border-color: #384257;
}

html {
    overflow-y: auto !important;
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--nera-bg);
    color: var(--nera-text);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    box-sizing: border-box;
}

#app {
    width: 100%;
    max-width: 760px;
    height: 90vh;
    min-height: 600px;
    max-height: 900px;
    display: flex;
    flex-direction: column;
    background-color: var(--nera-container-bg);
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    overflow: hidden;
    position: relative;
}

/* ============================================================================
   HEADER STYLES
   ============================================================================ */

.nera-header {
    padding: 1rem 1.5rem;
    background-color: rgba(0,0,0,0.2);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.nera-header .logo-container {
    display: flex;
    align-items: center;
    flex-grow: 1;
}

.nera-header .logo {
    height: 30px;
    margin-right: 12px;
}

.nera-header h1 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--nera-text);
    letter-spacing: 2px;
    margin: 0;
}

.header-controls {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

/* Username Display in Header */
.username-display {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: rgba(51, 117, 214, 0.1);
    border: 1px solid rgba(51, 117, 214, 0.3);
    border-radius: 8px;
    color: var(--nera-text);
    font-size: 0.9rem;
}

.username-display .icon {
    color: var(--nera-accent);
}

.username-text {
    font-weight: 500;
    color: var(--nera-text);
}

/* ============================================================================
   MODAL STYLES (DARK THEME)
   ============================================================================ */

.nera-modal .modal-background {
    background-color: rgba(0, 0, 0, 0.75);
}

.nera-modal-card {
    width: 90%;
    max-width: 500px;
    background-color: var(--nera-container-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6);
}

.nera-modal-head {
    background-color: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem 1.5rem;
}

.nera-modal-head .modal-card-title {
    color: var(--nera-text);
    font-size: 1.25rem;
    font-weight: 600;
}

.nera-modal-head .delete {
    background-color: rgba(255, 255, 255, 0.1);
}

.nera-modal-head .delete:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.nera-modal-body {
    background-color: var(--nera-container-bg);
    padding: 1.5rem;
}

.nera-modal-body .content p {
    color: var(--nera-text);
    margin-bottom: 1.5rem;
}

.nera-modal-body .nera-label {
    color: var(--nera-text);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.nera-modal-body .nera-input {
    background-color: var(--ai-msg-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--nera-text);
    padding: 0.75rem;
    font-size: 1rem;
}

.nera-modal-body .nera-input:focus {
    border-color: var(--nera-accent);
    box-shadow: 0 0 0 3px rgba(51, 117, 214, 0.1);
    outline: none;
}

.nera-modal-body .nera-input::placeholder {
    color: var(--nera-text-muted);
}

.nera-modal-body .nera-input.is-danger {
    border-color: #ff3860;
}

.nera-modal-body .nera-help {
    color: var(--nera-text-muted);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

.nera-modal-foot {
    background-color: rgba(0, 0, 0, 0.2);
    border-top: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}

.nera-button-primary {
    background-color: var(--nera-accent);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

.nera-button-primary:hover:not(:disabled) {
    background-color: #2862bf;
}

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

.nera-button-secondary {
    background-color: transparent;
    color: var(--nera-text);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

.nera-button-secondary:hover:not(:disabled) {
    background-color: rgba(255, 255, 255, 0.05);
}

/* ============================================================================
   CHAT WINDOW
   ============================================================================ */

.chat-window {
    flex-grow: 1;
    padding: 1.5rem;
    overflow-y: auto;
    background-color: var(--nera-container-bg);
}

/* Scrollbar styles */
.chat-window::-webkit-scrollbar {
    width: 8px;
}

.chat-window::-webkit-scrollbar-track {
    background: var(--nera-container-bg);
}

.chat-window::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 4px;
}

.chat-window::-webkit-scrollbar-thumb:hover {
    background-color: var(--nera-accent);
}

/* ============================================================================
   MESSAGES
   ============================================================================ */

.message {
    background: transparent;
    margin-bottom: 1.2rem;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.message .message-body {
    max-width: 85%;
    padding: 0.9rem 1.2rem;
    border-radius: 18px;
    line-height: 1.5;
    word-wrap: break-word;
    font-size: 0.95rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.message.is-user {
    align-items: flex-end;
}

.message.is-user .message-body {
    background-color: var(--user-msg-bg);
    color: white;
    border-bottom-right-radius: 6px;
}

.message.is-ai {
    align-items: flex-start;
}

.message.is-ai .message-body {
    background-color: var(--ai-msg-bg);
    color: var(--nera-text);
    border-bottom-left-radius: 6px;
}

.message .file-tags {
    margin-top: 0.6rem;
    max-width: 85%;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.message.is-user .file-tags {
    justify-content: flex-end;
}

.message.is-ai .file-tags {
    justify-content: flex-start;
}

.file-tags .tag {
    cursor: pointer;
}

/* ============================================================================
   CHAT INPUT
   ============================================================================ */

.chat-input-form {
    padding: 1.2rem 1.5rem;
    border-top: 1px solid var(--border-color);
    background-color: rgba(0,0,0,0.2);
}

.input-area {
    background-color: var(--ai-msg-bg);
    border-radius: 10px;
    padding: 0.75rem;
    margin-bottom: 0.8rem;
    border: 1px solid transparent;
    transition: border-color 0.2s ease-in-out;
}

.input-area:focus-within {
    border-color: var(--nera-accent);
}

.chat-input-form .input {
    background-color: transparent;
    border: none;
    color: var(--nera-text);
    box-shadow: none;
    width: 100%;
    padding: 0.5rem 0.2rem;
    font-size: 0.95rem;
}

.chat-input-form .input::placeholder {
    color: var(--nera-text-muted);
}

.chat-input-form .input:focus {
    outline: none;
}

.chat-input-buttons {
    margin-bottom: 0 !important;
}

/* ============================================================================
   UPLOADED FILES DISPLAY
   ============================================================================ */

.uploaded-files-container {
    background-color: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem;
    margin-bottom: 0.75rem;
}

.uploaded-files-header {
    margin-bottom: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.uploaded-files-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.uploaded-file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem;
    background-color: var(--ai-msg-bg);
    border-radius: 6px;
    transition: background-color 0.2s;
}

.uploaded-file-item:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.file-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
    cursor: pointer;
}

.file-name {
    font-weight: 500;
    color: var(--nera-text);
}

.file-size {
    font-size: 0.875rem;
    color: var(--nera-text-muted);
    margin-left: auto;
    margin-right: 0.5rem;
}

/* ============================================================================
   UPLOAD PROGRESS
   ============================================================================ */

.upload-progress-container {
    background-color: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem;
    margin-bottom: 0.75rem;
}

.upload-progress-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.upload-filename {
    font-size: 0.875rem;
    color: var(--nera-text);
    font-weight: 500;
}

.upload-progress-item .progress {
    margin-bottom: 0;
}

/* ============================================================================
   LOADING INDICATOR
   ============================================================================ */

.loading-indicator {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background-color: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
}

.loader {
    width: 24px;
    height: 24px;
    border: 3px solid var(--border-color);
    border-top-color: var(--nera-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.status-container {
    padding: 1rem;
    text-align: center;
}

.status-message {
    color: var(--nera-text-muted);
    font-size: 0.875rem;
    margin: 0;
    animation: fadeInOut 2s ease-in-out infinite;
}

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

/* ============================================================================
   GRAPHS
   ============================================================================ */

.graph-container {
    margin-top: 1rem;
    align-self: center;
    width: 95%;
    max-width: 600px;
}

.graph-container .card {
    background-color: var(--ai-msg-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    overflow: hidden;
}

.graph-container .card-header {
    background-color: rgba(0,0,0,0.2);
    border-bottom: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    margin: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.graph-container .card-header-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--nera-text);
    padding: 0;
}

.graph-container .card-header-icon .button {
    background: transparent;
    border: none;
    color: var(--nera-text-muted);
    font-size: 0.9rem;
}

.graph-container .card-header-icon .button:hover {
    color: var(--nera-text);
    background-color: var(--border-color);
}

.graph-container .card-content {
    padding: 1rem;
}

.graph-container .card.is-minimized .card-content {
    padding: 0.75rem 1rem;
}

.graph-container .card.is-minimized .minimized-text {
    font-size: 0.85rem;
    color: var(--nera-text-muted);
    text-align: center;
    margin: 0;
}

/* ============================================================================
   TOOLTIP
   ============================================================================ */

.preview-tooltip {
    position: fixed;
    z-index: 9999;
    background-color: var(--nera-container-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    padding: 0;
    width: 450px;
    max-height: 300px;
    overflow: auto;
    pointer-events: none;
    opacity: 0;
    transform: scale(0.95) translateY(10px);
    transition: opacity 0.2s ease-in-out, transform 0.2s ease-in-out;
}

.preview-tooltip.is-active {
    opacity: 1;
    transform: scale(1) translateY(0);
}

.preview-tooltip .table-container {
    padding: 8px;
}

.preview-tooltip table {
    width: 100%;
    border-collapse: collapse;
}

.preview-tooltip th,
.preview-tooltip td {
    padding: 6px 8px;
    border: 1px solid var(--border-color);
    text-align: left;
    font-size: 0.8rem;
    color: var(--nera-text);
    white-space: nowrap;
}

.preview-tooltip th {
    background-color: rgba(0, 0, 0, 0.3);
    font-weight: 500;
}

.preview-tooltip .loading-preview {
    padding: 2rem;
    text-align: center;
    color: var(--nera-text-muted);
}

.preview-tooltip::-webkit-scrollbar {
    width: 8px;
}

.preview-tooltip::-webkit-scrollbar-track {
    background: var(--nera-container-bg);
}

.preview-tooltip::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 4px;
}

.preview-tooltip::-webkit-scrollbar-thumb:hover {
    background-color: var(--nera-accent);
}

/* ============================================================================
   BUTTONS
   ============================================================================ */

.button.is-link {
    background-color: var(--nera-accent);
    border-radius: 8px;
}

button:focus,
input:focus,
.dropdown-trigger:focus {
    outline: 2px solid var(--nera-accent);
    outline-offset: 2px;
}

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

.input:disabled {
    background-color: rgba(0, 0, 0, 0.3);
    color: var(--nera-text-muted);
    cursor: not-allowed;
}

/* ============================================================================
   RESPONSIVE DESIGN
   ============================================================================ */

@media (max-width: 768px) {
    .nera-header {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }

    .header-controls {
        justify-content: space-between;
        flex-wrap: wrap;
    }

    .username-display {
        order: -1;
        width: 100%;
        justify-content: center;
    }

    .uploaded-file-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .file-info {
        width: 100%;
    }

    .file-size {
        margin-left: 0;
    }
}