/* CSS Variables for theming */
:root {
    /* Light mode colors */
    --bg-primary: #f0f2f5;
    --bg-secondary: #fff;
    --bg-tertiary: #f7f7f7;
    --text-primary: #1c1e21;
    --text-secondary: #65676b;
    --border-color: #ddd;
    --input-bg: #fff;
    --button-bg: #1877f2;

    /* Semantic colors */
    --success-color: #008000;
    --error-color: #d32f2f;
    --warning-color: #ff8c00;
}

body.dark-mode {
    /* Dark mode colors */
    --bg-primary: #1a1a1a;
    --bg-secondary: #2a2a2a;
    --bg-tertiary: #1e1e1e;
    --text-primary: #e0e0e0;
    --text-secondary: #b0b0b0;
    --border-color: #555;
    --input-bg: #1e1e1e;

    /* Semantic colors for dark mode */
    --success-color: #4ade80;
    --error-color: #ef5350;
    --warning-color: #ffa500;
}

html,
body {
    min-height: 100%;
    margin: 0;
    font-family: sans-serif;
    background-color: var(--bg-primary);
    transition: background-color 0.3s ease;
}

body {
    padding: 20px;
    box-sizing: border-box;
}

/* Dark mode base styles */
body.dark-mode {
    color: var(--text-primary);
}

body.dark-mode .container {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

body.dark-mode h1,
body.dark-mode h2 {
    color: #f0f0f0;
}

/* Input and button styles for dark mode */
body.dark-mode input {
    background-color: var(--input-bg);
    color: var(--text-primary);
    border-color: var(--border-color);
}

body.dark-mode button:not(.theme-toggle) {
    background-color: var(--input-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

body.dark-mode button:not(.theme-toggle):not(:disabled):hover {
    background-color: var(--bg-secondary);
    border-color: #777;
}

/* Code blocks and containers */
body.dark-mode #agent-card-content,
body.dark-mode #modal-json-content,
body.dark-mode .session-context-id,
body.dark-mode #chat-messages {
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

body.dark-mode #chat-messages {
    border-color: var(--border-color);
}

/* Message styles */
body.dark-mode .message.user {
    background-color: #0066cc;
}

body.dark-mode .message.agent {
    background-color: #3a3a3a;
    color: var(--text-primary);
}

body.dark-mode .message.agent-progress {
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
}

/* Containers and sections */
body.dark-mode .collapsible-content,
body.dark-mode .http-headers-content,
body.dark-mode .message-metadata-content,
body.dark-mode .session-details-container {
    border-color: var(--border-color);
}

body.dark-mode .session-details-container,
body.dark-mode .session-details-header {
    background-color: var(--bg-secondary);
}

body.dark-mode .session-details-header:hover {
    background-color: #3a3a3a;
}

body.dark-mode .modal-content {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

body.dark-mode .attachment-chip,
body.dark-mode .modality-tag {
    background-color: #3a3a3a;
    border-color: var(--border-color);
    color: var(--text-primary);
}

/* Text colors */
body.dark-mode .http-headers-header,
body.dark-mode .message-metadata-header {
    color: #f0f0f0;
}

body.dark-mode .placeholder-text {
    color: #888;
}

body.dark-mode .session-info-row strong {
    color: var(--text-secondary);
}

body.dark-mode .chat-info {
    color: var(--text-primary);
}

.container {
    max-width: 960px;
    margin: 0 auto 100px auto;
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

h1 {
    color: #1c1e21;
    font-size: 2em;
    margin: 0;
}

h2 {
    color: #1c1e21;
    font-size: 1.25em;
    margin: 0;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.header-container h1 {
    margin: 0;
}

/* Toggle Switch */
.theme-toggle {
    position: relative;
    width: 60px;
    height: 28px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.theme-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: 0.3s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: 0.3s;
    border-radius: 50%;
}

.slider:after {
    position: absolute;
    content: "☀";
    font-size: 14px;
    right: 7px;
    top: 50%;
    transform: translateY(-50%);
    color: #666;
    transition: opacity 0.3s;
}

input:checked + .slider:after {
    content: "☾";
    left: 7px;
    right: auto;
    color: #fff;
}

input:checked + .slider {
    background-color: #2196F3;
}

input:checked + .slider:before {
    transform: translateX(32px);
}

body.dark-mode .slider {
    background-color: #555;
}

body.dark-mode input:checked + .slider {
    background-color: #2196F3;
}

.collapsible-header {
    cursor: pointer;
    user-select: none;
    font-size: 1.25em;
    margin: 0 0 10px 0;
}

.toggle-icon {
    display: inline-block;
    transition: transform 0.2s;
}

.collapsible-header.collapsed .toggle-icon {
    transform: rotate(-90deg);
}

.collapsible-content {
    max-height: 1000px;
    overflow: hidden;
    transition: max-height 0.3s ease-in-out;
}

.collapsible-content.collapsed {
    max-height: 0;
}

#agent-card-section,
#chat-container {
    margin-top: 20px;
    border-top: 1px solid #ddd;
    padding-top: 20px;
}

.url-input-container,
.chat-input-container {
    display: flex;
    gap: 10px;
    margin-bottom: 60px;
}

.connect-btn-container {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 20px;
}

.http-headers-container,
.message-metadata-container {
    margin-bottom: 20px;
}

.http-headers-header,
.message-metadata-header {
    cursor: pointer;
    user-select: none;
    padding: 0;
    margin: 0 0 10px 0;
    font-weight: bold;
    font-size: 1.25em;
    color: #1c1e21;
}

.http-headers-content,
.message-metadata-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-in-out;
    padding: 0;
    margin: 0;
}

.http-headers-content.expanded,
.message-metadata-content.expanded {
    max-height: 800px;
    padding: 10px 0;
    overflow-y: auto;
}

/* Authentication Section Styles */
.auth-section {
    margin-bottom: 15px;
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-tertiary);
}

body.dark-mode .auth-section {
    background-color: var(--bg-secondary);
    border-color: var(--border-color);
}

.auth-label {
    display: block;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.9em;
}

.auth-type-select {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--input-bg);
    color: var(--text-primary);
    font-size: 0.85em;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
}

.auth-type-select:hover {
    background-color: var(--bg-secondary);
}

.auth-type-select:focus {
    outline: none;
    border-color: #1877f2;
}

body.dark-mode .auth-type-select {
    background-color: var(--input-bg);
    color: var(--text-primary);
    border-color: var(--border-color);
}

body.dark-mode .auth-type-select:hover {
    background-color: var(--bg-tertiary);
}

.auth-inputs {
    margin-top: 15px;
}

.auth-input-group {
    margin-bottom: 12px;
}

.auth-input-group label {
    display: block;
    font-size: 0.9em;
    margin-bottom: 4px;
    color: var(--text-secondary);
    font-weight: 500;
}

.auth-input-group input,
.auth-input-group select {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--input-bg);
    color: var(--text-primary);
    font-size: 0.85em;
    box-sizing: border-box;
    font-family: monospace;
}

.auth-input-group input:focus,
.auth-input-group select:focus {
    outline: none;
    border-color: #1877f2;
}

.auth-input-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 10px;
}

.section-divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 20px 0;
}

.section-label {
    display: block;
    font-weight: 500;
    margin-bottom: 12px;
    color: var(--text-primary);
    font-size: 0.9em;
}

.custom-headers-section {
    margin-top: 15px;
}

#headers-list,
#metadata-list {
    margin-bottom: 10px;
}

.header-item,
.metadata-item {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

.header-item input,
.metadata-item input {
    flex: 1;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.remove-header-btn,
.remove-metadata-btn {
    background-color: #dc3545;
    color: white;
    border: none;
    border-radius: 4px;
    padding: 0 10px;
    cursor: pointer;
}

#add-header-btn,
#add-metadata-btn {
    background-color: #1877f2;
    color: white;
    border: none;
    border-radius: 4px;
    padding: 8px 12px;
    cursor: pointer;
}

#agent-card-url,
#chat-input {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

#connect-btn,
#send-btn {
    padding: 10px 15px;
    border: none;
    background-color: #1877f2;
    color: white;
    border-radius: 4px;
    cursor: pointer;
}

#chat-input:disabled,
#send-btn:disabled {
    background-color: #e4e6eb;
    cursor: not-allowed;
}

/* Multimodal UI Support */
.chat-input-wrapper {
    margin-top: 10px;
}

.file-input-hidden {
    display: none;
}

.attach-btn {
    padding: 10px 12px;
    border: none;
    background-color: #f3f4f6;
    border-radius: 4px;
    cursor: pointer;
    margin-left: 8px;
    margin-right: 8px;
    transition: background-color 0.2s;
}

.attach-btn:hover:not(:disabled) {
    background-color: #e5e7eb;
}

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

.attach-icon {
    font-size: 1.2em;
}

.attachments-preview {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 8px;
    min-height: 0;
}

.attachments-preview:empty {
    display: none;
}

.attachment-chip {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    background-color: #f3f4f6;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 0.85em;
    max-width: 250px;
}

.attachment-thumbnail {
    width: 32px;
    height: 32px;
    object-fit: cover;
    border-radius: 4px;
    border: 1px solid #d1d5db;
}

.attachment-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.attachment-name {
    font-weight: 500;
    color: #374151;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

body.dark-mode .attachment-name {
    color: var(--text-primary);
}

.attachment-size {
    font-size: 0.9em;
    color: #6b7280;
}

body.dark-mode .attachment-size {
    color: var(--text-secondary);
}

.attachment-remove {
    background: none;
    border: none;
    color: #9ca3af;
    cursor: pointer;
    padding: 2px 4px;
    font-size: 1.2em;
    line-height: 1;
    transition: color 0.2s;
}

.attachment-remove:hover {
    color: #ef4444;
}

.agent-card-display {
    position: relative;
}

#agent-card-content {
    background-color: #f7f7f7;
    padding: 15px;
    border-radius: 4px;
    white-space: pre-wrap;
    word-wrap: break-word;
    max-height: 400px;
    overflow: auto;
}

#agent-card-content:empty {
    display: none;
}

.message {
    padding: 8px 12px;
    border-radius: 18px;
    margin-bottom: 8px;
    max-width: 75%;
    width: fit-content;
    cursor: pointer;
    transition: background-color 0.2s;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.message a {
    color: #050505;
    font-weight: bold;
    text-decoration: underline;
}

.message:hover {
    filter: brightness(95%);
}

.kind-chip {
    background-color: #dcdfe3;
    border: 1px solid #c8ccd1;
    color: #050505;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.8em;
    font-weight: 500;
    margin-right: 8px;
    display: inline-block;
    vertical-align: middle;
}

.kind-chip-task {
    background-color: #e0f2fe;
    /* light blue */
    border-color: #7dd3fc;
    color: #0c4a6e;
}

.kind-chip-status-update {
    background-color: #fefce8;
    /* light yellow */
    border-color: #fde047;
    color: #713f12;
}

.kind-chip-artifact-update {
    background-color: #dcfce7;
    /* light green */
    border-color: #86efac;
    color: #14532d;
}

.kind-chip-message {
    background-color: #f3e8ff;
    /* light purple */
    border-color: #d8b4fe;
    color: #581c87;
}

.kind-chip-error {
    background-color: #fef2f2;
    /* light red */
    border-color: #fca5a5;
    color: #991b1b;
}

.message.user {
    background-color: #0084ff;
    color: white;
    align-self: flex-end;
}

.message.agent {
    background-color: #e4e6eb;
    color: #050505;
    align-self: flex-start;
}

.message.agent-progress {
    background-color: #f0f0f0;
    color: #65676b;
    font-style: italic;
    font-size: 0.9em;
    align-self: flex-start;
}

.message.agent-error {
    background-color: #fbe3e4;
    color: #d12f2f;
    border: 1px solid #f5c6cb;
    align-self: flex-start;
}

.message.agent-loading {
    background-color: #f0f0f0;
    color: #65676b;
    align-self: flex-start;
    display: flex;
    align-items: center;
    gap: 8px;
    font-style: italic;
}

body.dark-mode .message.agent-loading {
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
}

.loading-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid #ddd;
    border-top-color: #1877f2;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

body.dark-mode .loading-spinner {
    border-color: #555;
    border-top-color: #2196F3;
}

.loading-text {
    font-size: 0.9em;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

/* <-- Fix: Styles for validation status */
.validation-status {
    align-self: flex-end;
    margin-top: 4px;
    font-size: 0.8em;
}

.validation-status.valid,
.success-text {
    color: var(--success-color);
}

.validation-status.invalid {
    color: var(--warning-color);
}

.error-text {
    color: var(--error-color);
}

#debug-console {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 300px;
    background: #2f3640;
    color: #f5f6fa;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.2);
    transform: translateY(0);
    transition: transform 0.3s ease-in-out;
}

#debug-console.hidden {
    transform: translateY(calc(100% - 40px));
}

#debug-handle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    height: 40px;
    background: #1f2429;
    cursor: ns-resize;
    user-select: none;
}

.debug-controls button {
    background: #4a4a4a;
    border: 1px solid #666;
    color: white;
    padding: 4px 10px;
    border-radius: 4px;
    cursor: pointer;
    margin-left: 10px;
}

#toggle-console-btn {
    background-color: #007bff;
}

#debug-content {
    height: calc(100% - 40px);
    overflow-y: auto;
    padding: 10px;
    font-family: monospace;
    white-space: pre-wrap;
}

.log-entry {
    padding: 8px;
    border-radius: 4px;
    margin-bottom: 5px;
    border-left: 3px solid #ccc;
}

.log-entry strong {
    font-weight: bold;
    margin-right: 10px;
}

.log-timestamp {
    color: #999;
    margin-right: 10px;
    font-size: 0.8em;
}

.log-entry.log-request {
    background-color: rgba(0, 123, 255, 0.1);
    border-left-color: #007bff;
}

.log-entry.log-response {
    background-color: rgba(108, 117, 125, 0.1);
    border-left-color: #6c757d;
}

.log-entry.log-error {
    background-color: rgba(220, 53, 69, 0.1);
    border-left-color: #dc3545;
}

.log-entry.log-validation_error {
    background-color: rgba(255, 193, 7, 0.1);
    border-left-color: #ffc107;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-overlay.hidden {
    display: none;
}

.modal-content {
    background: #fff;
    color: #1c1e21;
    padding: 20px;
    border-radius: 8px;
    width: 80%;
    max-width: 800px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    position: relative;
}

.modal-close-btn {
    position: absolute;
    top: 10px;
    right: 20px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    color: #555;
}

#modal-json-content {
    background: #f7f7f7;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 15px;
    overflow-y: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.json-highlight {
    background-color: #ffc107;
    color: #333;
    padding: 0 4px;
    border-radius: 3px;
}

#chat-messages {
    height: 300px;
    overflow-y: auto;
    border: 1px solid #ddd;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 10px;
    background-color: #f7f7f7;
    display: flex;
    flex-direction: column;
}

.chat-info {
    font-size: 0.9em;
    color: #65676b;
    margin-top: 0;
    text-align: center;
}

.placeholder-text {
    color: #888;
    text-align: center;
    padding: 0;
    margin: 0;
}

#validation-errors {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 20px;
}

#validation-errors .placeholder-text:only-child {
    margin: auto;
    padding: 20px;
}

.loader {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #1877f2;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    animation: spin 1s linear infinite;
    margin: 0;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.transport-badge {
    display: inline-block;
    font-size: 0.7em;
    font-weight: 500;
    padding: 2px 8px;
    border-radius: 12px;
    margin-left: 12px;
    vertical-align: middle;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: 1px solid;
}

.transport-badge.hidden {
    display: none;
}

.transport-badge.jsonrpc {
    background-color: #e0f2fe;
    /* light blue - matching kind-chip-task */
    color: #0c4a6e;
    border-color: #7dd3fc;
}

.transport-badge.http_json,
.transport-badge.http-json {
    background-color: #dcfce7;
    /* light green - matching kind-chip-artifact-update */
    color: #14532d;
    border-color: #86efac;
}

.transport-badge.grpc {
    background-color: #f3e8ff;
    /* light purple - matching kind-chip-message */
    color: #581c87;
    border-color: #d8b4fe;
}

/* Session Management */
.chat-header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.chat-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 0;
    font-size: 1.25em;
}

.session-badge {
    display: inline-block;
    font-size: 0.7em;
    font-weight: 500;
    padding: 2px 8px;
    border-radius: 12px;
    vertical-align: middle;
    letter-spacing: 0.3px;
    border: 1px solid;
}

.session-badge.hidden {
    display: none;
}

.session-badge.active {
    background-color: #dcfce7;
    /* light green */
    color: #14532d;
    border-color: #86efac;
}

.new-session-btn {
    padding: 6px 12px;
    border: none;
    background-color: #1877f2;
    color: white;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9em;
}

.new-session-btn:disabled {
    background-color: #e4e6eb;
    cursor: not-allowed;
}

.session-details-container {
    margin-bottom: 16px;
    border: 1px solid #e5e7eb;
    border-radius: 4px;
    background-color: #fafafa;
}

.session-details-header {
    padding: 10px 15px;
    cursor: pointer;
    user-select: none;
    font-weight: 500;
    background-color: #f9fafb;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.session-details-header:hover {
    background-color: #f3f4f6;
}

.session-details-header .toggle-icon {
    display: inline-block;
    transition: transform 0.2s;
    margin-right: 8px;
}

.session-details-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.session-details-content.expanded {
    max-height: 300px;
    padding: 15px;
    border-top: 1px solid #e5e7eb;
    overflow-y: auto;
}

.session-details-info {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.session-info-row {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.session-info-row strong {
    font-size: 0.9em;
    color: #4b5563;
}

.session-transport {
    font-size: 0.85em;
    font-weight: 500;
    padding: 4px 8px;
    border-radius: 8px;
    display: inline-block;
    width: fit-content;
    background-color: #e0f2fe;
    color: #0c4a6e;
}


.session-context-id {
    background-color: #f7f7f7;
    padding: 8px 12px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.85em;
    word-break: break-all;
    color: #374151;
    border: 1px solid #e5e7eb;
}

.session-helper-text {
    font-size: 0.85em;
    color: #6b7280;
    font-style: italic;
    margin: 8px 0 0 0;
    padding: 8px 12px;
    background-color: #f9fafb;
    border-radius: 4px;
    border-left: 3px solid #3b82f6;
}

.modalities-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 4px;
}

.modality-tag {
    font-size: 0.8em;
    padding: 3px 8px;
    background-color: #f3f4f6;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    color: #374151;
    white-space: nowrap;
}

.modality-none {
    font-size: 0.85em;
    color: #9ca3af;
    font-style: italic;
}

/* Message Attachments */
.message-attachments {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 8px;
}

.attachment-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.85em;
    padding: 4px 8px;
    background-color: rgba(255, 255, 255, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 12px;
    color: white;
    white-space: nowrap;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    width: fit-content;
}

.message.agent .attachment-badge {
    background-color: rgba(0, 0, 0, 0.1);
    border-color: rgba(0, 0, 0, 0.2);
    color: #050505;
}

body.dark-mode .message.agent .attachment-badge {
    color: var(--text-primary);
}

/* Media content styles */
.media-container {
    margin: 8px 0;
}

.media-image {
    max-width: 400px;
    max-height: 300px;
    border-radius: 8px;
    display: block;
}

.media-audio {
    max-width: 400px;
    display: block;
}

.media-video {
    max-width: 400px;
    max-height: 300px;
    border-radius: 8px;
    display: block;
}

.file-link {
    display: inline-block;
    padding: 8px 12px;
    background-color: #f3f4f6;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    text-decoration: none;
    color: #374151;
}

body.dark-mode .file-link {
    background-color: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-primary);
}

.file-link:hover {
    background-color: #e5e7eb;
}

body.dark-mode .file-link:hover {
    background-color: var(--bg-secondary);
}

/* ---- Floating Support Box (top-left, fixed) ---- */
.support-floating {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 1001;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px 16px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.08);
  max-width: 320px;
}


/* ---- Right Vertical Ad Rail ---- */
.ad-rail {
  position: fixed;
  right: 12px;
  top: 100px; /* below header */
  width: 180px; /* suitable for 160x600/300x600 responsive */
  z-index: 1000;
  background: transparent;
}

.ad-rail ins.adsbygoogle {
  display: block !important;
  width: 100% !important;
  min-height: 600px; /* skyscraper height hint */
}

/* Hide the rail on smaller screens (use the existing mobile sticky ad) */
@media (max-width: 1100px) {
  .ad-rail {
    display: none;
  }
}