body {
    display: flex;
    justify-content: center;
}

.ai-shell {
    width: 100%;
    max-width: 1150px;
    padding: 20px;
    padding-bottom: 60px;
}

.ai-body {
    display: flex;
    gap: 14px;
    min-height: calc(100vh - 140px);
}

.ai-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 14px;
}

.ai-topbar-left {
    display: flex;
    align-items: center;
}

.ai-back-btn {
    height: 44px;
    padding: 0 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background: var(--item_bg_color);
    backdrop-filter: blur(var(--card_filter));
    -webkit-backdrop-filter: blur(var(--card_filter));
}

.ai-topbar-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.ai-sessions-toggle {
    height: 44px;
    padding: 0 14px;
    border-radius: 10px;
    background: var(--item_bg_color);
    backdrop-filter: blur(var(--card_filter));
    -webkit-backdrop-filter: blur(var(--card_filter));
    border: none;
    color: var(--main_text_color);
    font-weight: 800;
    cursor: pointer;
    display: none;
}

.ai-model {
    height: 44px;
    padding: 0 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background: var(--item_bg_color);
    backdrop-filter: blur(var(--card_filter));
    -webkit-backdrop-filter: blur(var(--card_filter));
    font-weight: 700;
}

.ai-sessions {
    width: 280px;
    flex-shrink: 0;
    background: var(--item_bg_color);
    border-radius: 14px;
    padding: 14px;
    backdrop-filter: blur(var(--card_filter));
    -webkit-backdrop-filter: blur(var(--card_filter));
    display: flex;
    flex-direction: column;
    gap: 12px;
    overflow: hidden;
}

.ai-sessions-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.ai-sessions-title {
    font-weight: 900;
    font-size: 16px;
}

.ai-sessions-actions {
    display: flex;
    gap: 8px;
}

.ai-sessions-btn {
    height: 36px;
    padding: 0 12px;
    border-radius: 10px;
    background: rgba(0, 0, 0, 0.28);
    border: 1px solid rgba(255, 255, 255, 0.16);
    color: var(--main_text_color);
    font-weight: 800;
    cursor: pointer;
}

.ai-sessions-btn-primary {
    background: rgba(116, 123, 255, 0.9);
    border: none;
    color: #fff;
}

.ai-sessions-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-right: 2px;
}

.ai-sessions-list::-webkit-scrollbar {
    display: none;
}

.ai-session-item {
    padding: 10px 10px;
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.18);
    border: 1px solid rgba(255, 255, 255, 0.12);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.ai-session-item.active {
    background: rgba(116, 123, 255, 0.22);
    border: 1px solid rgba(116, 123, 255, 0.35);
}

.ai-session-title {
    font-weight: 800;
    font-size: 14px;
    line-height: 1.25;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.ai-session-meta {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.7);
    font-variant-numeric: tabular-nums;
}

.ai-card {
    background: var(--item_bg_color);
    border-radius: 14px;
    padding: 18px;
    backdrop-filter: blur(var(--card_filter));
    -webkit-backdrop-filter: blur(var(--card_filter));
    display: flex;
    flex-direction: column;
    gap: 14px;
    flex: 1;
    min-width: 0;
}

.ai-title {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.ai-title-main {
    font-size: 28px;
    font-weight: 900;
}

.ai-title-sub {
    font-size: 14px;
    color: var(--item_left_text_color);
    user-select: text;
}

.ai-chat {
    flex: 1;
    overflow-y: auto;
    padding: 10px;
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.12);
}

.ai-chat::-webkit-scrollbar {
    display: none;
}

.ai-msg {
    width: 100%;
    display: flex;
    margin-bottom: 10px;
}

.ai-bubble {
    max-width: min(720px, 92%);
    padding: 12px 14px;
    border-radius: 14px;
    line-height: 1.55;
    user-select: text;
    white-space: pre-wrap;
    word-break: break-word;
}

.ai-msg.user {
    justify-content: flex-end;
}

.ai-msg.user .ai-bubble {
    background: rgba(116, 123, 255, 0.22);
    border: 1px solid rgba(116, 123, 255, 0.35);
}

.ai-msg.assistant {
    justify-content: flex-start;
}

.ai-msg.assistant .ai-bubble {
    background: rgba(0, 0, 0, 0.28);
    border: 1px solid rgba(255, 255, 255, 0.12);
}

.ai-msg.system {
    justify-content: center;
}

.ai-msg.system .ai-bubble {
    background: rgba(0, 0, 0, 0.18);
    border: 1px dashed rgba(255, 255, 255, 0.18);
    font-size: 13px;
    color: rgba(255, 255, 255, 0.82);
}

.ai-composer {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.ai-composer-row {
    display: flex;
    gap: 10px;
    align-items: flex-end;
}

.ai-input {
    flex: 1;
    min-height: 44px;
    max-height: 140px;
    resize: none;
    padding: 12px 12px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.16);
    background: rgba(0, 0, 0, 0.28);
    color: var(--main_text_color);
    font-size: 15px;
    line-height: 1.4;
    outline: none;
}

.ai-send {
    height: 44px;
    min-width: 92px;
    border: none;
    border-radius: 12px;
    background: rgba(116, 123, 255, 0.9);
    color: #fff;
    font-weight: 800;
    cursor: pointer;
    padding: 0 14px;
}

.ai-send:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.ai-composer-row-bottom {
    align-items: center;
    justify-content: space-between;
}

.ai-upload-btn {
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 14px;
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.28);
    border: 1px solid rgba(255, 255, 255, 0.16);
    cursor: pointer;
    font-weight: 700;
}

.ai-upload-btn input {
    display: none;
}

.ai-clear {
    height: 44px;
    padding: 0 14px;
    border-radius: 12px;
    background: rgba(239, 68, 68, 0.22);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--main_text_color);
    font-weight: 800;
    cursor: pointer;
}

@media (max-width: 800px) {
    .ai-shell {
        padding: 14px;
    }
    .ai-body {
        gap: 10px;
    }
    .ai-card {
        padding: 14px;
    }
    .ai-title-main {
        font-size: 24px;
    }
    .ai-sessions-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }
    .ai-sessions {
        position: fixed;
        top: 72px;
        left: 14px;
        right: 14px;
        width: auto;
        z-index: 100001;
        max-height: calc(100vh - 92px);
        display: none;
    }
    .ai-sessions.open {
        display: flex;
    }
}