:root {
    color-scheme: light;
    --chat-text-size: 15px;
    --bg: #f4f6f8;
    --panel: #ffffff;
    --panel-2: #f9fafb;
    --ink: #111827;
    --muted: #6b7280;
    --line: #d9dee5;
    --accent: #0f766e;
    --accent-dark: #0b5d57;
    --accent-soft: #dff3ef;
    --danger: #b42318;
    --blue: #2563eb;
    --shadow: 0 14px 40px rgba(15, 23, 42, 0.12);
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --bg: #0f1419;
    --panel: #151b22;
    --panel-2: #10161d;
    --ink: #eef2f7;
    --muted: #9aa6b2;
    --line: #2a3440;
    --accent: #2dd4bf;
    --accent-dark: #14b8a6;
    --accent-soft: rgba(45, 212, 191, 0.14);
    --danger: #f87171;
    --blue: #60a5fa;
    --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg);
    color: var(--ink);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input,
textarea { font: inherit; }

.access-shell {
    display: grid;
    place-items: center;
    min-height: 100vh;
    padding: 20px;
}

.access-card {
    display: grid;
    gap: 12px;
    width: min(100%, 380px);
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--panel);
    box-shadow: var(--shadow);
}

.access-card label,
.eyebrow {
    color: var(--muted);
    font-size: 13px;
    font-weight: 700;
}

.access-card input {
    min-height: 42px;
    padding: 10px 12px;
    border: 1px solid var(--line);
    border-radius: 8px;
    color: var(--ink);
    background: var(--panel);
}

.access-card input:focus,
textarea:focus,
.session-menu input:focus {
    border-color: var(--accent);
    outline: 2px solid color-mix(in srgb, var(--accent) 22%, transparent);
}

.access-error {
    margin: 0;
    color: var(--danger);
    font-weight: 700;
}

.codex-layout {
    display: grid;
    --sidebar-width: 340px;
    --browser-panel-width: min(680px, 56vw);
    grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
    height: 100vh;
    overflow: hidden;
    background: var(--bg);
}

.codex-layout.browser-open {
    grid-template-columns: var(--sidebar-width) minmax(0, 1fr) var(--browser-panel-width);
}

.codex-layout.is-dragging-files .chat-shell {
    outline: 3px solid color-mix(in srgb, var(--accent) 70%, transparent);
    outline-offset: -10px;
}

.session-sidebar {
    position: relative;
    display: flex;
    flex-direction: column;
    min-width: 0;
    border-right: 1px solid var(--line);
    background: var(--panel-2);
    overflow: hidden;
    transition: width 0.18s ease, transform 0.18s ease;
}

.session-sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 16px;
    border-bottom: 1px solid var(--line);
    background: var(--panel);
    position: sticky;
    top: 0;
    z-index: 3;
}

.session-sidebar h2,
h1 {
    margin: 0;
    line-height: 1.15;
}

.session-sidebar h2 { font-size: 18px; }
h1 { font-size: 22px; }

.brand-lockup {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
}

.brand-lockup > div {
    min-width: 0;
}

.brand-mark {
    display: inline-grid;
    place-items: center;
    flex: 0 0 auto;
    width: 38px;
    height: 38px;
    border: 1px solid color-mix(in srgb, var(--accent) 34%, var(--line));
    border-radius: 8px;
    background:
        linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--blue) 70%, var(--accent)));
    color: #fff;
    font-size: 14px;
    font-weight: 900;
    letter-spacing: 0;
    box-shadow: 0 8px 18px color-mix(in srgb, var(--accent) 22%, transparent);
}

.sidebar-heading {
    display: flex;
    align-items: center;
    gap: 10px;
}

.browser-link {
    color: var(--accent);
    font-size: 13px;
    font-weight: 800;
    text-decoration: none;
}

.browser-link:hover { text-decoration: underline; }

.sidebar-actions,
.topbar-actions {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.icon-action,
.topbar-button,
.back-link,
.file-button span,
button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 38px;
    padding: 0 12px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--panel);
    color: var(--ink);
    font-weight: 700;
    cursor: pointer;
}

.icon-action {
    width: 36px;
    padding: 0;
    border-color: var(--accent);
    background: var(--accent);
    color: #fff;
    font-size: 18px;
}

.icon-action.secondary {
    border-color: var(--line);
    background: var(--panel-2);
    color: var(--ink);
}

button:hover,
.file-button span:hover,
.topbar-button:hover,
.back-link:hover {
    border-color: var(--accent);
}

.topbar-button[aria-expanded="true"],
.side-view-button[aria-expanded="true"] {
    border-color: var(--accent);
    background: var(--accent-soft);
    color: var(--accent-dark);
}

.search-toggle-button {
    width: 38px;
    padding: 0;
    font-size: 20px;
    line-height: 1;
}

.menu-toggle-button {
    width: 38px;
    padding: 0;
    font-size: 20px;
    line-height: 1;
}

.session-list {
    display: grid;
    align-content: start;
    grid-auto-rows: max-content;
    gap: 7px;
    padding: 10px;
    min-height: 0;
    overflow-y: auto;
    flex: 1;
}

.session-sidebar-footer {
    position: sticky;
    bottom: 0;
    z-index: 4;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 10px;
    border-top: 1px solid var(--line);
    background: var(--panel);
}

.session-sidebar-footer form {
    margin: 0;
}

.projects-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 10px 12px 0;
}

.projects-toolbar h3 {
    margin: 0;
    color: var(--ink);
    font-size: 13px;
    font-weight: 900;
    letter-spacing: 0;
}

.projects-toolbar-actions {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.projects-archive-view,
.projects-star-filter,
.projects-create-toggle {
    width: 30px;
    min-height: 30px;
    padding: 0;
    border-radius: 8px;
    font-size: 17px;
    line-height: 1;
}

.projects-archive-view,
.projects-star-filter {
    color: var(--muted);
    background: transparent;
    border-color: transparent;
}

.projects-archive-view.active,
.projects-archive-view[aria-pressed="true"],
.projects-star-filter.active,
.projects-star-filter[aria-pressed="true"] {
    color: var(--accent);
    background: var(--accent-soft);
    border-color: color-mix(in srgb, var(--accent) 34%, var(--line));
}

.projects-create-toggle {
    background: var(--panel);
}

.project-create-form {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px;
    padding: 8px 10px 0;
}

.project-create-form[hidden] {
    display: none;
}

.project-create-form input {
    min-width: 0;
    min-height: 36px;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 0 10px;
    background: var(--panel);
    color: var(--ink);
}

.project-create-form button,
.project-add-button,
.project-archive-button,
.project-delete-button {
    min-height: 34px;
    padding: 0 10px;
}

.project-block {
    display: grid;
    align-content: start;
    grid-auto-rows: max-content;
    gap: 2px;
    min-width: 0;
}

.project-block.project-dragging {
    opacity: 0.55;
}

.project-block[hidden] {
    display: none;
}

.project-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 3px;
    padding: 2px 2px 4px;
}

.project-collapse-button {
    justify-content: flex-start;
    min-width: 0;
    min-height: 30px;
    flex: 1;
    border-color: transparent;
    background: transparent;
    color: var(--muted);
    font-size: 12px;
    font-weight: 900;
    line-height: 1.2;
    overflow: hidden;
    padding: 0 4px;
    text-transform: uppercase;
}

.project-header-actions {
    display: inline-flex;
    align-items: center;
    gap: 3px;
}

.project-header-actions form {
    margin: 0;
}

.project-collapse-button span:last-child {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.project-caret {
    display: inline-flex;
    width: 14px;
    flex: 0 0 14px;
    justify-content: center;
    transition: transform 0.14s ease;
}

.project-collapsed .project-caret {
    transform: rotate(-90deg);
}

.project-collapsed .session-row {
    display: none;
}

.project-add-button,
.project-archive-button,
.project-delete-button {
    width: 28px;
    min-height: 28px;
    border-radius: 8px;
    font-size: 16px;
    padding: 0;
}

.project-archive-button,
.project-delete-button {
    color: var(--muted);
    background: var(--panel);
}

.project-delete-button:hover {
    border-color: var(--danger);
    color: var(--danger);
}

.project-drag-handle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    min-height: 28px;
    border: 1px solid var(--line);
    border-radius: 8px;
    color: var(--muted);
    background: var(--panel);
    cursor: grab;
    opacity: 0;
    transition: opacity 0.12s ease, border-color 0.12s ease;
}

.project-drag-handle:active {
    cursor: grabbing;
}

.project-header:hover .project-drag-handle,
.project-header:focus-within .project-drag-handle,
.project-dragging .project-drag-handle {
    opacity: 1;
}

.session-row {
    position: relative;
    display: grid;
    grid-template-columns: 10% 70% 10% 10%;
    gap: 3px;
    align-items: center;
    border: 1px solid transparent;
    border-radius: 8px;
    padding-right: 28px;
}

.session-row[hidden] {
    display: none;
}

.session-row.active {
    border-color: color-mix(in srgb, var(--accent) 35%, var(--line));
    background: var(--accent-soft);
}

.session-row:hover {
    background: color-mix(in srgb, var(--panel) 70%, var(--accent-soft));
}

.session-link {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 18px 24px;
    grid-column: 2 / 5;
    gap: 6px;
    align-items: center;
    min-height: 42px;
    padding: 8px 4px 8px 9px;
    color: var(--ink);
    text-decoration: none;
}

.pin-form {
    display: grid;
    place-items: center;
    grid-column: 1;
    align-self: center;
    margin: 0;
}

.pin-button {
    width: 22px;
    min-height: 22px;
    padding: 0;
    border: 0;
    background: transparent;
    color: var(--muted);
    font-size: 14px;
    line-height: 1;
}

.pin-button.active {
    color: #d97706;
}

.pin-button:hover {
    color: #d97706;
    background: transparent;
    border-color: transparent;
}

.session-title {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 13px;
    font-weight: 700;
}

.session-count {
    color: var(--muted);
    font-size: 12px;
    font-weight: 700;
}

.unread-dot {
    width: 8px;
    height: 8px;
    border-radius: 999px;
    background: var(--blue);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--blue) 16%, transparent);
}

.session-menu {
    position: absolute;
    right: 4px;
    top: 4px;
    width: 28px;
    padding-top: 0;
}
.session-menu summary {
    display: grid;
    place-items: center;
    width: 28px;
    min-width: 28px;
    padding: 0;
    height: 34px;
    border-radius: 8px;
    cursor: pointer;
    list-style: none;
}
.session-menu summary::-webkit-details-marker { display: none; }
.session-menu summary:hover { background: var(--panel); }
.session-menu[open] {
    z-index: 10;
    width: min(210px, calc(100vw - 24px));
}
.session-menu[open] summary {
    margin-left: auto;
}
.session-menu form {
    z-index: 12;
    display: grid;
    gap: 6px;
    width: 100%;
    margin: 4px 0 6px;
    padding: 8px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--panel);
    box-shadow: var(--shadow);
}
.session-menu input {
    min-width: 0;
    padding: 8px;
    border: 1px solid var(--line);
    border-radius: 8px;
    color: var(--ink);
    background: var(--panel-2);
}
.session-menu select {
    min-width: 0;
    min-height: 34px;
    padding: 0 8px;
    border: 1px solid var(--line);
    border-radius: 8px;
    color: var(--ink);
    background: var(--panel-2);
}
.session-menu button { min-height: 32px; justify-content: flex-start; }
.danger-action { border-color: var(--danger); background: var(--danger); color: #fff; }

.sidebar-collapsed { grid-template-columns: 64px minmax(0, 1fr); }
.sidebar-collapsed.browser-open { grid-template-columns: 64px minmax(0, 1fr) var(--browser-panel-width); }
.sidebar-collapsed .session-sidebar-header { padding: 12px 8px; }
.sidebar-collapsed .session-sidebar {
    overflow: visible;
}
.sidebar-collapsed .sidebar-title-block,
.sidebar-collapsed .session-title,
.sidebar-collapsed .session-count,
.sidebar-collapsed .session-menu,
.sidebar-collapsed .sidebar-actions form,
.sidebar-collapsed .projects-toolbar,
.sidebar-collapsed .project-create-form,
.sidebar-collapsed .project-header { display: none; }
.sidebar-collapsed .sidebar-actions {
    display: flex;
    width: 100%;
    justify-content: center;
}
.sidebar-collapsed #sidebarToggle {
    display: inline-flex;
    width: 42px;
    min-height: 42px;
    border-color: var(--accent);
    background: var(--accent);
    color: #fff;
    font-size: 0;
}
.sidebar-collapsed #sidebarToggle::before {
    content: '☰';
    font-size: 20px;
    line-height: 1;
}
.sidebar-collapsed .session-list { padding: 8px; }
.sidebar-collapsed .session-row { grid-template-columns: 1fr; }
.sidebar-collapsed .session-link { grid-template-columns: 1fr; justify-items: center; padding: 10px 0; }
.sidebar-collapsed .unread-dot { width: 10px; height: 10px; }
.sidebar-collapsed .session-sidebar-footer {
    flex-direction: column;
    padding: 8px;
}

.sidebar-resize {
    position: absolute;
    top: 0;
    right: -5px;
    bottom: 0;
    z-index: 6;
    width: 10px;
    min-height: 0;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    cursor: col-resize;
}

.sidebar-resize::after {
    content: '';
    position: absolute;
    top: 50%;
    right: 4px;
    width: 3px;
    height: 54px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--line) 70%, var(--accent));
    transform: translateY(-50%);
}

.sidebar-resize:hover,
.sidebar-resize:focus {
    background: color-mix(in srgb, var(--accent) 24%, transparent);
    outline: none;
}

.sidebar-collapsed .sidebar-resize {
    display: none;
}

.chat-shell {
    position: relative;
    display: grid;
    grid-template-rows: auto minmax(0, 1fr) auto;
    height: 100vh;
    min-width: 0;
    background: var(--panel);
}

.scroll-jump {
    position: absolute;
    z-index: 35;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    min-height: 38px;
    padding: 0;
    border-radius: 999px;
    border-color: var(--line);
    background: var(--panel);
    color: var(--ink);
    box-shadow: var(--shadow);
    opacity: 0;
    pointer-events: none;
    transform: translateY(4px);
    transition: opacity 0.14s ease, transform 0.14s ease;
}

.scroll-jump.visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.scroll-jump-top {
    top: 66px;
    right: 18px;
}

.scroll-jump-bottom {
    right: 18px;
    bottom: 68px;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 8px 20px;
    border-bottom: 1px solid var(--line);
    background: var(--panel);
}

.topbar-logo {
    min-width: 0;
}

.text-size-control {
    position: relative;
    display: inline-flex;
}

.text-size-toggle {
    width: 40px;
    padding: 0;
    font-size: 15px;
    line-height: 1;
}

.text-size-panel {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    z-index: 55;
    display: grid;
    gap: 7px;
    width: 190px;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--panel);
    box-shadow: var(--shadow);
}

.text-size-panel[hidden] {
    display: none;
}

.text-size-panel label {
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
}

.text-size-panel select {
    min-width: 0;
    min-height: 36px;
    padding: 0 9px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--panel-2);
    color: var(--ink);
}

.page-search-bar {
    position: absolute;
    top: 58px;
    left: 0;
    right: 0;
    z-index: 45;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 34px 34px 34px auto;
    gap: 6px;
    align-items: center;
    padding: 8px 14px;
    border-bottom: 1px solid var(--line);
    background: var(--panel);
    box-shadow: var(--shadow);
}

.page-search-bar[hidden] {
    display: none;
}

.page-search-bar input {
    min-width: 0;
    min-height: 34px;
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 0 12px;
    background: var(--panel-2);
    color: var(--ink);
}

.page-search-bar button {
    width: 34px;
    min-height: 34px;
    padding: 0;
    border-radius: 999px;
}

.page-search-count {
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
    white-space: nowrap;
}

.page-search-bar .page-search-results {
    grid-column: 1 / -1;
    display: grid;
    align-items: stretch;
    gap: 2px;
    justify-self: start;
    width: min(560px, calc(100vw - 28px));
    max-height: min(320px, 45vh);
    overflow-y: auto;
    padding-top: 4px;
}

.page-search-bar .page-search-results[hidden] {
    display: none;
}

.page-search-bar .page-search-result {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px;
    justify-items: stretch;
    width: 100%;
    min-height: 42px;
    padding: 7px 9px;
    border: 0;
    border-radius: 8px;
    background: transparent;
    color: var(--ink);
    text-align: left;
    justify-content: stretch;
}

.page-search-bar .page-search-result:hover,
.page-search-bar .page-search-result.active {
    background: var(--panel-2);
}

.page-search-bar .page-search-result strong {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 13px;
}

.page-search-bar .page-search-result span {
    grid-column: 1 / -1;
    overflow: hidden;
    color: var(--muted);
    font-size: 12px;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.search-current {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

.back-link {
    text-decoration: none;
}

.messages {
    min-height: 0;
    overflow-y: auto;
    padding: 22px;
    background: var(--bg);
}

.conversation-title {
    margin: 0 0 14px;
}

.conversation-title h1 {
    display: -webkit-box;
    overflow: hidden;
    font-size: 20px;
    line-height: 1.2;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.message {
    display: grid;
    grid-template-columns: 38px minmax(0, 1fr);
    gap: 10px;
    margin-bottom: 12px;
}

.message.user { grid-template-columns: minmax(0, 1fr) 38px; }
.message.user .avatar { grid-column: 2; }
.message.user .bubble {
    grid-column: 1;
    grid-row: 1;
    justify-self: end;
    background: var(--accent-soft);
}

.avatar {
    display: grid;
    place-items: center;
    width: 38px;
    height: 38px;
    border-radius: 9px;
    background: #26313c;
    color: #fff;
    font-size: 12px;
    font-weight: 800;
}

.bubble {
    max-width: 860px;
    padding: 7px 12px 9px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--panel);
    font-size: var(--chat-text-size);
    line-height: 1.45;
    white-space: pre-wrap;
    box-shadow: 0 1px 0 rgba(15, 23, 42, 0.03);
}

.meta {
    margin-bottom: 0;
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
    line-height: 1.2;
    white-space: normal;
}

.message-text,
.response-text { margin: 0; }
.message.error .bubble { border-color: color-mix(in srgb, var(--danger) 40%, var(--line)); color: var(--danger); }

.attachments,
.preview {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 8px;
}

.attachments a,
.attachments span,
.preview button,
.attachment-preview {
    max-width: 220px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    padding: 5px 8px;
    border: 1px solid var(--line);
    border-radius: 7px;
    color: var(--muted);
    font-size: 12px;
    background: var(--panel);
    min-height: 0;
    cursor: pointer;
}

.attachments a { color: var(--accent); font-weight: 800; text-decoration: none; }
.attachments a:has(img) {
    display: inline-flex;
    max-width: none;
    padding: 0;
    border: 0;
    background: transparent;
}
.attachments img {
    display: block;
    width: min(220px, 48vw);
    max-height: 180px;
    object-fit: cover;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--panel);
}
.attachment-preview { display: inline-flex; align-items: center; max-width: none; padding: 0; border: 0; gap: 4px; }

.composer {
    z-index: 25;
    display: grid;
    grid-template-columns: 32px minmax(0, 1fr) 34px;
    gap: 6px;
    align-items: end;
    padding: 4px 8px 12px;
    padding-bottom: calc(12px + env(safe-area-inset-bottom));
    border-top: 1px solid var(--line);
    background: var(--panel);
}

.preview { grid-column: 1 / -1; margin: 0; }
.file-button input { position: absolute; inline-size: 1px; block-size: 1px; opacity: 0; }
.file-button span,
#send {
    width: 32px;
    min-height: 32px;
    padding: 0;
    border-radius: 999px;
    font-size: 18px;
    line-height: 1;
}

textarea {
    min-height: 32px;
    max-height: 104px;
    resize: none;
    overflow-y: auto;
    padding: 6px 11px;
    border: 1px solid var(--line);
    border-radius: 18px;
    color: var(--ink);
    background: var(--panel-2);
    line-height: 1.25;
}

#send { border-color: var(--accent); background: var(--accent); color: #fff; }
#send:hover { background: var(--accent-dark); }
button:disabled,
textarea:disabled,
.file-button:has(input:disabled) span { cursor: wait; opacity: 0.65; }

.browser-panel {
    position: relative;
    display: none;
    min-width: 0;
    height: 100vh;
    border-left: 1px solid color-mix(in srgb, var(--line) 78%, var(--accent));
    background: var(--panel);
    box-shadow: -18px 0 42px rgba(15, 23, 42, 0.08);
}

.codex-layout.browser-open .browser-panel {
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
}

.browser-panel-resize {
    position: absolute;
    top: 0;
    bottom: 0;
    left: -5px;
    z-index: 4;
    width: 10px;
    min-height: 0;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    cursor: col-resize;
}

.browser-panel-resize::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 4px;
    width: 3px;
    height: 54px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--line) 70%, var(--accent));
    transform: translateY(-50%);
}

.browser-panel-resize:hover,
.browser-panel-resize:focus {
    background: color-mix(in srgb, var(--accent) 24%, transparent);
    outline: none;
}

.browser-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    min-width: 0;
    min-height: 62px;
    padding: 10px 12px 10px 16px;
    border-bottom: 1px solid var(--line);
    background:
        linear-gradient(180deg, color-mix(in srgb, var(--panel) 94%, var(--accent-soft)), var(--panel));
}

.browser-panel-title {
    display: grid;
    gap: 2px;
    min-width: 0;
}

.browser-panel-title strong {
    overflow: hidden;
    color: var(--ink);
    font-size: 15px;
    line-height: 1.2;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.browser-panel-actions {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    min-width: 0;
}

.browser-panel-tabs {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    padding: 3px;
    border: 1px solid var(--line);
    border-radius: 9px;
    background: var(--panel-2);
}

.browser-panel-tab {
    min-height: 30px;
    padding: 0 9px;
    border: 0;
    border-radius: 7px;
    background: transparent;
    color: var(--muted);
    font-size: 12px;
}

.browser-panel-tab.active {
    background: var(--panel);
    color: var(--ink);
    box-shadow: 0 1px 4px rgba(15, 23, 42, 0.12);
}

.pdf-panel-select {
    max-width: 150px;
    min-height: 34px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--panel-2);
    color: var(--ink);
    font-size: 12px;
    font-weight: 700;
}

.pdf-panel-select[hidden] {
    display: none;
}

.browser-panel-actions a {
    display: inline-grid;
    place-items: center;
    width: 36px;
    min-width: 36px;
    min-height: 36px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--panel-2);
    color: var(--accent);
    font-size: 16px;
    font-weight: 800;
    text-decoration: none;
}

.browser-panel-actions a:hover {
    border-color: var(--accent);
    text-decoration: none;
}

.browser-panel-stage {
    position: relative;
    min-height: 0;
    overflow: hidden;
    background: var(--panel-2);
}

.browser-panel-frame {
    display: block;
    width: 100%;
    height: 100%;
    border: 0;
    background: var(--panel-2);
}

.browser-panel-loading {
    position: absolute;
    inset: 12px;
    z-index: 1;
    display: grid;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 12px;
    color: var(--muted);
    font-size: 13px;
    font-weight: 800;
    background:
        linear-gradient(90deg, transparent, color-mix(in srgb, var(--panel) 76%, transparent), transparent),
        var(--panel);
    background-size: 220% 100%;
    animation: browserPanelLoading 1.4s ease-in-out infinite;
}

.browser-panel-loading[hidden] {
    display: none;
}

@keyframes browserPanelLoading {
    0% { background-position: 140% 0; }
    100% { background-position: -140% 0; }
}

.codex-layout.is-resizing-browser,
.codex-layout.is-resizing-browser *,
.codex-layout.is-resizing-sidebar,
.codex-layout.is-resizing-sidebar * {
    cursor: col-resize;
    user-select: none;
}

.codex-layout.is-resizing-browser .browser-panel-frame,
.codex-layout.is-resizing-sidebar .browser-panel-frame {
    pointer-events: none;
}

.lightbox {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: grid;
    place-items: center;
    padding: 24px;
    background: rgba(0, 0, 0, 0.82);
}
.lightbox[hidden] { display: none; }
.lightbox img {
    max-width: min(100%, 1100px);
    max-height: 90vh;
    border-radius: 10px;
    background: #fff;
    box-shadow: var(--shadow);
}
.lightbox-close {
    position: fixed;
    top: 14px;
    right: 14px;
    width: 42px;
    min-height: 42px;
    padding: 0;
    border-color: rgba(255, 255, 255, 0.5);
    background: rgba(0, 0, 0, 0.35);
    color: #fff;
    font-size: 28px;
}

@media (max-width: 760px) {
    body {
        overflow: hidden;
    }
    .codex-layout {
        grid-template-columns: 1fr;
        height: 100vh;
        height: 100svh;
        max-height: 100svh;
    }
    .codex-layout.browser-open,
    .sidebar-collapsed.browser-open { grid-template-columns: 1fr; }
    .session-sidebar {
        position: fixed;
        inset: 0 auto 0 0;
        z-index: 50;
        width: min(86vw, 320px);
        transform: translateX(-100%);
        box-shadow: var(--shadow);
    }
    .codex-layout.sidebar-open .session-sidebar { transform: translateX(0); }
    .chat-shell {
        height: 100vh;
        height: 100svh;
        max-height: 100svh;
    }
    .session-sidebar #sidebarToggle {
        font-size: 0;
    }
    .session-sidebar #sidebarToggle::before {
        content: '×';
        font-size: 24px;
        line-height: 1;
    }
    .sidebar-resize { display: none; }
    .browser-panel {
        position: fixed;
        inset: 0;
        z-index: 60;
        width: auto;
        border-left: 0;
    }
    .browser-panel-resize { display: none; }
    .topbar,
    .messages { padding-inline: 14px; }
    .topbar {
        position: sticky;
        top: 0;
        z-index: 21;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 8px;
        padding: 6px 14px;
    }
    .topbar-logo {
        min-width: 0;
    }
    .conversation-title {
        margin-bottom: 12px;
    }
    .conversation-title h1 {
        display: -webkit-box;
        overflow: hidden;
        font-size: 17px;
        line-height: 1.2;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
    }
    .topbar .brand-mark {
        width: 34px;
        height: 34px;
        font-size: 13px;
    }
    .topbar-actions {
        width: auto;
        flex-shrink: 0;
        justify-content: flex-end;
        gap: 6px;
    }
    .topbar-actions .side-view-button,
    .topbar-actions .back-link {
        display: none;
    }
    .topbar-button,
    .back-link {
        min-height: 34px;
        padding-inline: 9px;
        font-size: 13px;
    }
    .menu-toggle-button {
        width: 34px;
        padding: 0;
        font-size: 20px;
    }
    .search-toggle-button {
        width: 34px;
        padding: 0;
        font-size: 20px;
    }
    .page-search-bar {
        position: fixed;
        top: 0;
        grid-template-columns: minmax(0, 1fr) 32px 32px 32px;
        padding: 7px 8px;
    }
    .page-search-count {
        grid-column: 1 / -1;
        padding-left: 8px;
    }
    .composer {
        grid-template-columns: 32px minmax(0, 1fr) 34px;
        padding: 4px 8px 12px;
        padding-bottom: calc(12px + env(safe-area-inset-bottom));
    }
    .scroll-jump {
        width: 36px;
        min-height: 36px;
    }
    .scroll-jump-top {
        top: 58px;
        right: 14px;
    }
    .scroll-jump-bottom {
        right: 14px;
        bottom: 58px;
    }
}