.app-shell {
    display: flex;
    flex-direction: row-reverse;
    height: 100vh;
    width: 100%;
    overflow: hidden;
}

.theme-toggle-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    margin-top: var(--spacing-xs);
}

    .theme-toggle-btn:hover {
        background-color: var(--color-bg-hover);
        color: var(--color-text-primary);
    }
/* ===================================================================
   Sidebar
=================================================================== */

.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    background-color: var(--color-bg-secondary);
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: width var(--transition-base), margin var(--transition-base);
    overflow: hidden;
}

    .sidebar.collapsed {
        width: 0;
    }

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    flex-shrink: 0;
}

.sidebar-icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    flex-shrink: 0;
}

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

.new-chat-section {
    padding: 0 var(--spacing-md) var(--spacing-sm);
    flex-shrink: 0;
}

.new-chat-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    font-weight: 500;
}

    .new-chat-btn:hover {
        background-color: var(--color-bg-hover);
    }

.sidebar-search {
    padding: 0 var(--spacing-md) var(--spacing-md);
    flex-shrink: 0;
}

.sidebar-search-box {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    background-color: transparent;
    border: 1px solid transparent;
}

    .sidebar-search-box:hover {
        background-color: var(--color-bg-hover);
    }

    .sidebar-search-box input {
        border: none;
        background: transparent;
        padding: 0;
        flex: 1;
        font-size: var(--font-size-base);
    }

        .sidebar-search-box input:focus {
            border: none;
            background: transparent;
        }

.chat-list-wrapper {
    flex: 1;
    overflow-y: auto;
    padding: 0 var(--spacing-sm);
}

.chat-list-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-xs);
    font-weight: 500;
}

.chat-list {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.chat-list-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    position: relative;
    color: var(--color-text-secondary);
}

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

    .chat-list-item.active {
        background-color: var(--color-bg-active);
        color: var(--color-text-primary);
    }

    .chat-list-item .chat-title {
        flex: 1;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
        font-size: var(--font-size-base);
    }

    .chat-list-item .chat-options-btn {
        opacity: 0;
        width: 24px;
        height: 24px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: var(--radius-sm);
        flex-shrink: 0;
    }

    .chat-list-item:hover .chat-options-btn {
        opacity: 1;
    }

    .chat-list-item .chat-options-btn:hover {
        background-color: var(--color-bg-active);
    }

.sidebar-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    flex-shrink: 0;
}

.user-profile-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
}

    .user-profile-btn:hover {
        background-color: var(--color-bg-hover);
    }

.user-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background-color: var(--color-success);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
    color: #fff;
    flex-shrink: 0;
}

.user-name {
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
}

.user-plan-tag {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* ===================================================================
   Main chat section
=================================================================== */

.main-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    background-color: var(--color-bg-primary);
    min-width: 0;
    position: relative;
}

.main-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--spacing-lg);
    flex-shrink: 0;
}

    .main-header .header-left,
    .main-header .header-right {
        display: flex;
        align-items: center;
        gap: var(--spacing-sm);
    }

.model-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-md);
    font-weight: 600;
}

    .model-selector:hover {
        background-color: var(--color-bg-hover);
    }

/* Chat body */

.chat-body-wrapper {
    flex: 1;
    overflow-y: auto;
    position: relative;
}

.chat-body {
    max-width: 780px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-xxl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    min-height: 100%;
}

/* Timestamp divider, like "دیروز ۶:۲۰ بعدازظهر" in the screenshot */

.chat-timestamp {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    padding-bottom: var(--spacing-sm);
}

/* Empty / welcome state */

.welcome-state {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    text-align: center;
}

.welcome-title {
    font-size: var(--font-size-xxl);
    font-weight: 600;
    color: var(--color-text-primary);
}

/* Loading state (spinner while "loading" a sample chat) */

.chat-loading-state {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    color: var(--color-text-secondary);
    font-size: var(--font-size-md);
    animation: fadeIn var(--transition-base);
}

/* ===================================================================
   Message rows — no avatars, matches screenshot exactly
=================================================================== */

.message-row {
    display: flex;
    animation: fadeIn var(--transition-slow);
    width: 100%;
}

    /*.message-row.user {
        justify-content: flex-end;
    }*/

    .message-row.assistant {
        justify-content: flex-start;
    }

.message-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    max-width: 85%;
}

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

.message-row.assistant .message-content {
    align-items: flex-start;
    max-width: 100%;
    width: 100%;
}

/* User message: right-aligned dark pill, like the screenshot */
.message-row.user .message-bubble {
    background-color: var(--color-bg-tertiary);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-md);
    line-height: var(--line-height-base);
    white-space: pre-wrap;
    word-break: break-word;
}

/* Assistant message: plain full-width text, no bubble/background */
.message-row.assistant .message-bubble {
    background-color: transparent;
    padding: 0;
    font-size: var(--font-size-md);
    line-height: var(--line-height-base);
    white-space: pre-wrap;
    word-break: break-word;
    width: 100%;
}

.message-bubble strong {
    font-weight: 700;
}

.message-bubble ul {
    list-style: disc;
    padding-inline-start: var(--spacing-xl);
    margin: var(--spacing-sm) 0;
}

.message-bubble li {
    margin-bottom: var(--spacing-xs);
}

.message-bubble code {
    background-color: var(--color-bg-tertiary);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    direction: ltr;
    display: inline-block;
}

/* Assistant message action row (copy / like / dislike / share / regenerate / more) */

.message-actions {
    display: flex;
    align-items: center;
    gap: 2px;
    padding-top: var(--spacing-xs);
}

.message-action-btn {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
}

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

/* Composer (input area) */

.composer-wrapper {
    flex-shrink: 0;
    padding: 0 var(--spacing-lg) var(--spacing-lg);
}

.composer {
    max-width: 780px;
    margin: 0 auto;
}

.composer-box {
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-sm);
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-xl);
    padding: var(--spacing-sm) var(--spacing-sm) var(--spacing-sm) var(--spacing-md);
}

    .composer-box textarea {
        flex: 1;
        border: none;
        background: transparent;
        max-height: 200px;
        min-height: 24px;
        padding: var(--spacing-sm);
    }

        .composer-box textarea:focus {
            border: none;
            background: transparent;
        }

.composer-send-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--color-accent);
    color: var(--color-text-inverse);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

    .composer-send-btn:hover {
        background-color: var(--color-accent-hover);
    }

    .composer-send-btn:disabled {
        background-color: var(--color-bg-active);
        color: var(--color-text-muted);
    }

.composer-hint {
    text-align: center;
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    padding-top: var(--spacing-sm);
}

/* ===================================================================
   Markdown content inside assistant messages
=================================================================== */

.message-bubble.markdown-body {
    font-size: var(--font-size-md);
    line-height: var(--line-height-base);
}

    .message-bubble.markdown-body h1,
    .message-bubble.markdown-body h2,
    .message-bubble.markdown-body h3 {
        margin: var(--spacing-lg) 0 var(--spacing-sm);
        font-weight: 700;
    }

    .message-bubble.markdown-body p {
        margin: var(--spacing-sm) 0;
    }

    .message-bubble.markdown-body ul,
    .message-bubble.markdown-body ol {
        padding-inline-start: var(--spacing-xl);
        margin: var(--spacing-sm) 0;
    }

    .message-bubble.markdown-body ul {
        list-style: disc;
    }

    .message-bubble.markdown-body ol {
        list-style: decimal;
    }

    .message-bubble.markdown-body li {
        margin-bottom: var(--spacing-xs);
    }

    .message-bubble.markdown-body strong {
        font-weight: 700;
    }

    .message-bubble.markdown-body em {
        font-style: italic;
    }

    .message-bubble.markdown-body a {
        text-decoration: underline;
    }

    .message-bubble.markdown-body blockquote {
        border-inline-start: 3px solid var(--color-border-light);
        padding-inline-start: var(--spacing-md);
        color: var(--color-text-secondary);
        margin: var(--spacing-sm) 0;
    }

    .message-bubble.markdown-body table {
        border-collapse: collapse;
        width: 100%;
        margin: var(--spacing-sm) 0;
        font-size: var(--font-size-base);
    }

    .message-bubble.markdown-body th,
    .message-bubble.markdown-body td {
        border: 1px solid var(--color-border);
        padding: var(--spacing-sm) var(--spacing-md);
        text-align: start;
    }

    /* Inline code (not in a code block) */
    .message-bubble.markdown-body code:not(pre code) {
        background-color: var(--color-bg-tertiary);
        padding: 2px 6px;
        border-radius: var(--radius-sm);
        font-size: var(--font-size-sm);
        direction: ltr;
        display: inline-block;
        font-family: "Consolas", "Courier New", monospace;
    }

/* Code block wrapper with a header bar showing language + copy button */
.code-block-wrapper {
    direction: ltr;
    text-align: left;
    margin: var(--spacing-md) 0;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.code-block-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--color-bg-tertiary);
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    font-family: "Consolas", "Courier New", monospace;
}

.code-block-copy-btn {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--color-text-secondary);
    font-size: var(--font-size-xs);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
}

    .code-block-copy-btn:hover {
        background-color: var(--color-bg-active);
        color: var(--color-text-primary);
    }

    .code-block-copy-btn.copied,
    .message-action-btn.copied {
        color: var(--color-success);
    }

.message-bubble.markdown-body pre {
    margin: 0;
    padding: var(--spacing-md);
    background-color: #0d1117;
    overflow-x: auto;
}

    .message-bubble.markdown-body pre code {
        font-family: "Consolas", "Courier New", monospace;
        font-size: var(--font-size-sm);
        background: transparent;
        padding: 0;
    }

/* ===================================================================
   Per-message direction support (mixed Persian/English in one chat)
=================================================================== */

.message-bubble[dir="rtl"] {
    text-align: right;
}

.message-bubble[dir="ltr"] {
    text-align: left;
}

.message-row.assistant .message-content[dir="ltr"] {
    align-items: flex-start;
}

.message-row.assistant .message-content[dir="rtl"] {
    align-items: flex-start; /* assistant is always full width, dir only affects text alignment */
}

.message-row.user .message-content[dir="ltr"] {
    align-items: flex-end;
}

/* ===================================================================
   Scroll-to-bottom floating button
=================================================================== */

.scroll-to-bottom-btn {
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border-light);
    color: var(--color-text-primary);
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    z-index: var(--z-header);
}

    .scroll-to-bottom-btn.visible {
        display: flex;
    }

    .scroll-to-bottom-btn:hover {
        background-color: var(--color-bg-active);
    }

/* Regenerating message shows a subtle pulsing state instead of full reload */
.message-bubble.regenerating {
    opacity: 0.6;
}

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

@media (max-width: 900px) {
    .sidebar {
        position: absolute;
        right: 0;
        top: 0;
        z-index: var(--z-sidebar);
        box-shadow: var(--shadow-lg);
    }

        .sidebar.collapsed {
            box-shadow: none;
        }
}