:root {
    /* Color palette inspired by reference UI - dark modern theme */
    --bg-primary: #1e1e21;
    --bg-secondary: #252529;
    --bg-tertiary: #2d2d31;
    --bg-hover: #333338;
    --bg-active: #3a3a3f;
    --bg-input: #2d2d31;
    --bg-bubble-user: #3d3d42;
    --bg-bubble-assistant: transparent;

    --text-primary: #e9eef4;
    --text-secondary: #a0a0a8;
    --text-muted: #6b6b72;
    --text-inverse: #1e1e21;

    --border-color: #333338;
    --border-color-hover: #3a3a3f;
    --border-color-focus: #4a4a50;

    --accent: #7c7cff;
    --accent-hover: #8b8bff;

    --sidebar-width: 260px;
    --chat-max-width: 720px;
}

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

html, body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    height: 100%;
    width: 100%;
}

body {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 15px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1 {
    font-weight: 500;
    font-size: 15px;
    margin: 0;
    letter-spacing: 0;
    color: var(--text-secondary);
}

/* ===========================
   Layout
   =========================== */

.layout {
    display: flex;
    height: 100vh;
    width: 100%;
    overflow: hidden;
}

.chat-layout {
    height: 100%;
}

/* ===========================
   Sidebar
   =========================== */

.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    height: 100%;
    overflow: hidden;
}

.sidebar-top {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

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

.sidebar-header h2 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
}

.sidebar-header button {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 5px 10px;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.sidebar-header button:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.session-list {
    list-style: none;
    padding: 4px 8px;
    margin: 0;
    flex: 1;
    overflow-y: auto;
}

.session-list::-webkit-scrollbar {
    width: 5px;
}

.session-list::-webkit-scrollbar-track {
    background: transparent;
}

.session-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.session-group-label {
    padding: 10px 8px 4px;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.session-item {
    padding: 7px 8px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: background 0.15s ease;
    position: relative;
}

.session-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.session-title {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.session-title.pending-title {
    color: var(--text-muted);
    font-style: italic;
}

.session-actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    opacity: 0;
    transition: opacity 0.15s ease;
}

.session-item:hover .session-actions {
    opacity: 1;
}

.session-menu-trigger {
    width: 22px;
    height: 22px;
    padding: 0;
    border-radius: 5px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1;
    cursor: pointer;
}

.session-menu-trigger:hover {
    background: var(--bg-active);
    color: var(--text-primary);
}

/* ===========================
   Sidebar Footer (User Info)
   =========================== */

.sidebar-footer {
    padding: 10px 12px;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-info {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--bg-hover);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    flex-shrink: 0;
    overflow: hidden;
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.user-details {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.user-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-email {
    font-size: 11px;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.logout-btn {
    width: 32px;
    height: 32px;
    padding: 0;
    border-radius: 8px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s ease;
    flex-shrink: 0;
}

.logout-btn svg {
    width: 18px;
    height: 18px;
}

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

/* Sidebar memory button shares the logout-btn shape */
.footer-icon-btn {
    width: 32px;
    height: 32px;
    padding: 0;
    border-radius: 8px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s ease;
    flex-shrink: 0;
}
.footer-icon-btn svg { width: 18px; height: 18px; }
.footer-icon-btn:hover { background: var(--bg-hover); color: var(--text-primary); }

/* Composer icon button (pause-memory toggle) */
.composer-icon-btn {
    position: relative;
    width: 32px;
    height: 32px;
    padding: 0;
    border-radius: 8px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s ease;
    flex-shrink: 0;
}
.composer-icon-btn svg { width: 18px; height: 18px; }
.composer-icon-btn:hover { background: var(--bg-hover); color: var(--text-primary); }
.composer-icon-btn .composer-icon-strike {
    position: absolute;
    left: 6px;
    right: 6px;
    top: 50%;
    height: 2px;
    background: currentColor;
    transform: rotate(-30deg);
    transform-origin: center;
    border-radius: 2px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.12s ease;
}
.composer-icon-btn.is-active {
    color: var(--accent, #1f6feb);
    background: rgba(31, 111, 235, 0.10);
}
.composer-icon-btn.is-active .composer-icon-strike { opacity: 1; }

/* Memory management modal */
.memory-modal {
    position: fixed;
    inset: 0;
    z-index: 60;
    display: flex;
    align-items: center;
    justify-content: center;
}
.memory-modal.hidden { display: none; }
.memory-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
}
.memory-modal-panel {
    position: relative;
    width: min(560px, calc(100vw - 32px));
    max-height: min(80vh, 720px);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary, #fff);
    color: var(--text-primary);
    border-radius: 14px;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
    padding: 18px 18px 12px;
}
.memory-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 4px;
}
.memory-modal-header h3 { margin: 0; font-size: 17px; }
.memory-modal-close {
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 22px;
    line-height: 1;
    cursor: pointer;
    padding: 4px 10px;
    border-radius: 6px;
}
.memory-modal-close:hover { background: var(--bg-hover); color: var(--text-primary); }
.memory-modal-subtitle {
    margin: 0 0 12px;
    font-size: 13px;
    color: var(--text-muted);
}
.memory-modal-body {
    overflow-y: auto;
    flex: 1;
    padding-right: 4px;
}
.memory-empty {
    color: var(--text-muted);
    font-size: 13px;
    padding: 24px 4px;
    text-align: center;
}
.memory-list { list-style: none; margin: 0; padding: 0; }
.memory-item {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-rows: auto auto;
    column-gap: 12px;
    padding: 10px 4px;
    border-bottom: 1px solid var(--border-color, rgba(0,0,0,0.08));
}
.memory-item:last-child { border-bottom: none; }
.memory-text { grid-column: 1; grid-row: 1; font-size: 14px; line-height: 1.4; }
.memory-meta {
    grid-column: 1;
    grid-row: 2;
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 2px;
}
.memory-delete-btn {
    grid-column: 2;
    grid-row: 1 / span 2;
    align-self: center;
    border: 1px solid var(--border-color, rgba(0,0,0,0.18));
    background: transparent;
    color: var(--text-muted);
    border-radius: 14px;
    padding: 4px 12px;
    font-size: 12px;
    cursor: pointer;
}
.memory-delete-btn:hover { background: var(--bg-hover); color: var(--text-primary); }
.memory-delete-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ===========================
   Main Content Area
   =========================== */

.wrap {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-width: 0;
}

/* ===========================
   Chat Area
   =========================== */

.chat-shell {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 0;
}

.chat {
    flex: 1;
    overflow-y: auto;
    padding: 24px 0 12px;
    scroll-behavior: smooth;
    min-height: 0;
}

.chat::-webkit-scrollbar {
    width: 5px;
}

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

.chat::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

/* ===========================
   Messages
   =========================== */

.msg {
    margin: 0;
    padding: 0 24px;
}

.msg + .msg {
    margin-top: 4px;
}

.role {
    display: none;
}

.bubble {
    max-width: var(--chat-max-width);
    margin: 0 auto;
    padding: 10px 16px;
    border-radius: 12px;
    white-space: pre-wrap;
    line-height: 1.65;
}

/* User messages - pill shaped, right-aligned */
.you .bubble {
    background: var(--bg-bubble-user);
    color: var(--text-primary);
    margin-left: auto;
    margin-right: 20%;
    max-width: calc(var(--chat-max-width) * 0.7);
    white-space: pre-wrap;
    border-radius: 18px;
}

/* Assistant messages - no bubble, left-aligned */
.assistant .bubble {
    background: transparent;
    color: var(--text-primary);
    margin-left: 20%;
    margin-right: auto;
    max-width: var(--chat-max-width);
    white-space: normal;
    padding: 10px 0;
    border: none;
}

.assistant .bubble p {
    margin: 0 0 16px;
}

.assistant .bubble p:last-child {
    margin-bottom: 0;
}

.assistant .bubble ul,
.assistant .bubble ol {
    margin: 0 0 16px;
    padding-left: 20px;
}

.assistant .bubble ul:last-child,
.assistant .bubble ol:last-child {
    margin-bottom: 0;
}

.assistant .bubble li {
    margin: 4px 0;
}

.assistant .bubble code {
    background: var(--bg-tertiary);
    border: none;
    border-radius: 4px;
    padding: 2px 5px;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.88em;
}

/* --- Markdown prose (assistant) --- */
.assistant .bubble h1,
.assistant .bubble h2,
.assistant .bubble h3,
.assistant .bubble h4,
.assistant .bubble h5,
.assistant .bubble h6 {
    font-weight: 600;
    line-height: 1.25;
    margin: 22px 0 10px;
}
.assistant .bubble h1 { font-size: 1.55em; }
.assistant .bubble h2 { font-size: 1.35em; }
.assistant .bubble h3 { font-size: 1.18em; }
.assistant .bubble h4 { font-size: 1.05em; }
.assistant .bubble h1:first-child,
.assistant .bubble h2:first-child,
.assistant .bubble h3:first-child,
.assistant .bubble h4:first-child { margin-top: 0; }

.assistant .bubble pre {
    position: relative;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color, rgba(0,0,0,0.08));
    border-radius: 8px;
    padding: 12px 14px;
    overflow-x: auto;
    margin: 0 0 16px;
    font-size: 0.9em;
    line-height: 1.5;
}
.assistant .bubble pre code {
    background: transparent;
    border: none;
    padding: 0;
    font-size: inherit;
    white-space: pre;
}
.assistant .bubble pre .code-copy-btn {
    position: absolute;
    top: 6px;
    right: 8px;
    border: 1px solid var(--border-color, rgba(0,0,0,0.12));
    background: var(--bg-secondary, rgba(255,255,255,0.85));
    color: var(--text-muted);
    font-size: 11px;
    line-height: 1;
    padding: 4px 8px;
    border-radius: 6px;
    cursor: pointer;
    opacity: 0;
    transition: opacity 120ms ease;
}
.assistant .bubble pre:hover .code-copy-btn,
.assistant .bubble pre .code-copy-btn:focus {
    opacity: 1;
}

.assistant .bubble blockquote {
    border-left: 3px solid var(--border-color, rgba(0,0,0,0.18));
    color: var(--text-muted);
    margin: 0 0 16px;
    padding: 2px 0 2px 12px;
}

.assistant .bubble table {
    border-collapse: collapse;
    margin: 0 0 16px;
    width: 100%;
    display: block;
    overflow-x: auto;
    font-size: 0.92em;
}
.assistant .bubble th,
.assistant .bubble td {
    border: 1px solid var(--border-color, rgba(0,0,0,0.12));
    padding: 6px 10px;
    text-align: left;
    vertical-align: top;
}
.assistant .bubble thead th {
    background: var(--bg-tertiary);
    font-weight: 600;
}

.assistant .bubble hr {
    border: 0;
    border-top: 1px solid var(--border-color, rgba(0,0,0,0.12));
    margin: 18px 0;
}

.assistant .bubble a {
    color: var(--accent, #1f6feb);
    text-decoration: underline;
    text-underline-offset: 2px;
}
.assistant .bubble a:hover { text-decoration-thickness: 2px; }

.assistant .bubble ol {
    list-style: decimal;
}

/* Status bar */
.status {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 12px;
    margin-top: 6px;
    max-width: var(--chat-max-width);
    margin-left: 20%;
    padding: 0;
}

.status .left {
    flex: 0 1 auto;
}

.status .right {
    margin-left: auto;
    color: var(--text-muted);
    white-space: nowrap;
}

/* ===========================
   Action Buttons
   =========================== */

.response-actions {
    display: flex;
    align-items: center;
    gap: 2px;
    margin-top: 6px;
    max-width: var(--chat-max-width);
    margin-left: 20%;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.msg:hover .response-actions {
    opacity: 1;
}

.response-action-btn {
    width: 30px;
    height: 30px;
    padding: 0;
    border-radius: 6px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.15s ease;
}

.response-action-btn svg {
    width: 16px;
    height: 16px;
    display: block;
}

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

.response-action-btn.active {
    color: var(--accent);
}

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

/* User-message hover actions (Edit and resend) */
.user-actions {
    display: flex;
    justify-content: flex-end;
    gap: 2px;
    margin-top: 4px;
    max-width: var(--chat-max-width);
    margin-left: auto;
    margin-right: 0;
    opacity: 0;
    transition: opacity 0.2s ease;
}
.msg.you:hover .user-actions,
.msg.you:focus-within .user-actions {
    opacity: 1;
}

/* Inline editor for edit-and-resend */
.user-edit-editor {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-left: auto;
    max-width: var(--chat-max-width);
    background: var(--bg-secondary, #f7f7f8);
    border: 1px solid var(--border-color, rgba(0,0,0,0.12));
    border-radius: 12px;
    padding: 10px 12px;
}
.user-edit-textarea {
    width: 100%;
    min-height: 60px;
    border: none;
    background: transparent;
    color: inherit;
    font: inherit;
    resize: vertical;
    outline: none;
}
.user-edit-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}
.user-edit-actions .btn-cancel,
.user-edit-actions .btn-save {
    padding: 6px 14px;
    border-radius: 16px;
    border: 1px solid var(--border-color, rgba(0,0,0,0.18));
    background: transparent;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 13px;
}
.user-edit-actions .btn-save {
    background: var(--accent, #1f6feb);
    border-color: var(--accent, #1f6feb);
    color: white;
}
.user-edit-actions .btn-save:hover { filter: brightness(1.05); }
.user-edit-actions .btn-cancel:hover { background: var(--bg-hover, rgba(0,0,0,0.05)); }
.user-edit-actions .btn-save:disabled { opacity: 0.6; cursor: not-allowed; }

.response-action-notice {
    margin-left: 6px;
    color: var(--text-secondary);
    font-size: 12px;
    white-space: nowrap;
}

.grounding-badge {
    display: inline-flex;
    align-items: center;
    margin-top: 8px;
    padding: 3px 8px;
    border: 1px solid var(--border-color);
    border-radius: 999px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 11px;
    line-height: 1.2;
}

.grounding-euf_supported {
    border-color: #294962;
    color: #9fc1ff;
}

.grounding-general_fallback {
    border-color: #66552a;
    color: #e6c57a;
}

.grounding-history_only,
.grounding-conversation_only,
.grounding-assistant_capabilities {
    border-color: #38465d;
    color: #b7c2d4;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

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

.hidden {
    display: none;
}

/* ===========================
   Sources (inline reference chips)
   =========================== */

.sources-title {
    margin: 12px 0 8px;
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 500;
    max-width: var(--chat-max-width);
    margin-left: 20%;
}

.sources-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin: 0 0 12px;
    max-width: var(--chat-max-width);
    margin-left: 20%;
    padding: 0;
    list-style: none;
}

.sources-list li {
    margin: 0;
    font-size: 12px;
    line-height: 1;
}

.sources-list li .cite {
    display: none;
}

.sources-list li a {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 10px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 999px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 12px;
    transition: all 0.15s ease;
    white-space: nowrap;
    max-width: 220px;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sources-list li a:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-color-hover);
}

.sources-list li a .source-label {
    font-weight: 500;
    color: var(--text-muted);
    font-size: 11px;
    flex-shrink: 0;
}

.sources-list li a .source-domain {
    opacity: 0.6;
    font-size: 11px;
    flex-shrink: 0;
}

sup.cite {
    font-size: 0.7em;
    line-height: 0;
    vertical-align: super;
    opacity: 0.65;
    cursor: pointer;
}

/* ===========================
   Composer / Input Bar
   =========================== */

.composer {
    padding: 0 24px 20px;
    max-width: calc(var(--chat-max-width) + 48px);
    margin: 0 auto;
    width: 100%;
}

.composer-inner {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-input);
    padding: 10px 12px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    transition: border-color 0.15s ease;
}

.composer-inner:focus-within {
    border-color: var(--border-color-focus);
}

input[type="text"],
textarea#question {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    padding: 6px 4px;
    outline: none;
    resize: none;
    min-height: 22px;
    max-height: 200px;
    font-family: inherit;
    font-size: 15px;
    line-height: 1.5;
    overflow-y: hidden;
}

textarea#question::placeholder {
    color: var(--text-muted);
}

button {
    background: transparent;
    color: var(--text-secondary);
    border: none;
    border-radius: 8px;
    padding: 8px 12px;
    cursor: pointer;
    transition: all 0.15s ease;
}

button:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

#upload-pdf {
    width: 34px;
    height: 34px;
    padding: 0;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

#upload-pdf svg {
    width: 18px;
    height: 18px;
    display: block;
}

#upload-pdf:disabled {
    background: transparent;
    color: var(--text-muted);
    cursor: not-allowed;
}

#upload-pdf.is-loading {
    background: transparent;
    color: var(--accent);
    position: relative;
}

#upload-pdf.is-loading::after {
    content: "";
    position: absolute;
    inset: 7px;
    border: 2px solid rgba(124, 124, 255, 0.2);
    border-top-color: var(--accent);
    border-radius: 999px;
    animation: uploadSpin 0.8s linear infinite;
}

.composer-actions {
    display: flex;
    align-items: center;
    gap: 4px;
    flex-shrink: 0;
}

#send {
    width: 34px;
    height: 34px;
    padding: 0;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    background: transparent;
    color: var(--text-muted);
}

#send svg {
    width: 18px;
    height: 18px;
    display: block;
}

#send:hover {
    background: transparent;
    color: var(--text-primary);
}

#send:disabled {
    background: transparent;
    color: var(--text-muted);
    cursor: not-allowed;
}

#send.is-stop {
    color: #ff6b6b;
}

#send.is-stop:hover {
    background: transparent;
    color: #ff8a8a;
}

/* ===========================
   Uploaded Files
   =========================== */

.uploaded-files {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 0 auto 8px;
    max-width: calc(var(--chat-max-width) + 48px);
    padding: 0 24px;
}

.file-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    max-width: 100%;
    padding: 5px 10px;
    border: 1px solid var(--border-color);
    border-radius: 999px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-size: 12px;
}

.file-chip-name {
    max-width: 180px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-chip-status {
    color: var(--text-muted);
    font-size: 11px;
}

.file-chip-remove {
    width: 16px;
    height: 16px;
    border: 0;
    border-radius: 50%;
    padding: 0;
    background: transparent;
    color: var(--text-muted);
    line-height: 1;
    font-size: 14px;
}

.file-chip-remove:hover {
    color: var(--text-primary);
}

/* ===========================
   Session Menu (floating)
   =========================== */

.session-menu {
    position: fixed;
    min-width: 130px;
    padding: 4px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: var(--bg-secondary);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    z-index: 9999;
}

.session-menu-item {
    width: 100%;
    text-align: left;
    padding: 7px 10px;
    border: 0;
    border-radius: 6px;
    background: transparent;
    color: var(--text-primary);
    font-size: 13px;
    cursor: pointer;
}

.session-menu-item:hover {
    background: var(--bg-hover);
}

.session-menu-item.danger {
    color: #ff6b6b;
}

.session-menu-item.danger:hover {
    background: rgba(255, 107, 107, 0.1);
}

/* ===========================
   Login Layout
   =========================== */

.login-layout {
    justify-content: center;
    align-items: center;
    height: 100%;
}

.auth-card {
    background: var(--bg-secondary);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    padding: 32px 36px 28px;
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.3);
    min-width: 340px;
    max-width: 400px;
    width: 100%;
}

.auth-card h1 {
    font-size: 22px;
    margin: 0 0 8px;
    text-align: center;
}

.auth-subtitle {
    margin: 0 0 24px;
    font-size: 14px;
    text-align: center;
    color: var(--text-muted);
}

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

.auth-form input[type="email"],
.auth-form input[type="password"] {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 10px;
    padding: 12px 14px;
    outline: none;
    font-size: 15px;
    transition: border-color 0.15s ease;
}

.auth-form input[type="email"]:focus,
.auth-form input[type="password"]:focus {
    border-color: var(--border-color-focus);
}

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

.auth-form button {
    margin-top: 8px;
    background: var(--accent);
    color: var(--text-inverse);
    border: none;
    border-radius: 10px;
    padding: 12px 16px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s ease;
}

.auth-form button:hover {
    background: var(--accent-hover);
}

#login-status {
    font-size: 13px;
    min-height: 16px;
    text-align: center;
}

/* ===========================
   Animations
   =========================== */

.blink {
    animation: fadepulse 1.6s ease-in-out infinite;
}

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

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

/* ===========================
   Citations
   =========================== */

/* ===========================
   Voice Controls
   =========================== */

.tts-controls {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 10px 14px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    min-width: 140px;
}

.tts-controls.hidden {
    display: none;
}

.tts-control-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.tts-status {
    font-size: 13px;
    color: var(--text-primary);
    white-space: nowrap;
}

.tts-buttons {
    display: flex;
    gap: 6px;
}

.tts-btn {
    background: transparent;
    border: none;
    border-radius: 6px;
    padding: 6px;
    cursor: pointer;
    transition: background 0.15s ease;
    width: 34px;
    height: 34px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

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

.tts-btn svg,
.speak-btn svg,
.stt-mic-btn svg {
    width: 18px;
    height: 18px;
    display: block;
}

.speak-btn {
    background: transparent;
    border: none;
    border-radius: 6px;
    padding: 4px;
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.15s ease, background 0.15s ease;
    width: 28px;
    height: 28px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.speak-btn:hover {
    opacity: 1;
    background: var(--bg-hover);
    color: var(--text-primary);
}

.stt-mic-btn {
    background: transparent;
    border: none;
    border-radius: 10px;
    padding: 8px;
    cursor: pointer;
    transition: all 0.15s ease;
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

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

.stt-mic-btn.listening {
    background: rgba(255, 107, 107, 0.15);
    color: #ff6b6b;
    animation: pulse 1.5s infinite;
}

.stt-listening-indicator {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    min-width: 80px;
    height: 36px;
    padding: 0 10px;
    border: 1px solid var(--border-color);
    border-radius: 999px;
    background: var(--bg-tertiary);
    color: var(--text-muted);
    justify-self: start;
}

.stt-listening-indicator.hidden {
    display: none;
}

.stt-wave-bar {
    width: 3px;
    height: 10px;
    border-radius: 999px;
    background: var(--accent);
    animation: sttWave 1s ease-in-out infinite;
}

.stt-wave-bar:nth-child(2) {
    animation-delay: 0.15s;
}

.stt-wave-bar:nth-child(3) {
    animation-delay: 0.3s;
}

.stt-wave-label {
    margin-left: 4px;
    font-size: 12px;
    white-space: nowrap;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.05); }
}

@keyframes sttWave {
    0%, 100% { transform: scaleY(0.65); opacity: 0.65; }
    50% { transform: scaleY(1.35); opacity: 1; }
}

/* ===========================
   Audio Row
   =========================== */

.audio-row {
    font-size: 12px;
    color: var(--text-muted);
    padding: 0 24px;
    max-width: calc(var(--chat-max-width) + 48px);
    margin: 0 auto;
}

.audio-row audio {
    width: 100%;
    max-height: 32px;
}

/* ===========================
   Responsive
   =========================== */

@media (max-width: 720px) {
    .sidebar {
        width: 240px;
    }

    .bubble {
        padding: 8px 12px;
    }

    .you .bubble {
        margin-right: 12px;
    }

    .assistant .bubble {
        margin-left: 12px;
    }

    .status {
        margin-left: 12px;
    }

    .response-actions {
        margin-left: 12px;
    }

    .composer {
        padding: 0 12px 16px;
    }
}

@media (max-width: 560px) {
    .sidebar {
        display: none;
    }

    .chat {
        padding: 16px 0;
    }

    .msg {
        padding: 0 12px;
    }

    .you .bubble {
        margin-right: 8px;
    }

    .assistant .bubble {
        margin-left: 8px;
    }

    .status {
        margin-left: 8px;
    }

    .response-actions {
        margin-left: 8px;
    }

    .composer {
        padding: 0 8px 12px;
    }
}